TECHNICAL FIELD

Embodiments herein concern methods and arrangements for supporting use of quasi co-located (QCL) antenna ports in a wireless communication network, e.g. a telecommunication network, such as specified by the 3rd Generation Partnership Project (3GPP).

BACKGROUND

Communication devices such as wireless communication devices, that simply may be named wireless devices, may also be known as e.g. user equipments (UEs), mobile terminals, wireless terminals and/or mobile stations. A wireless device is enabled to communicate wirelessly in a wireless communication network, wireless communication system, or radio communication system, e.g. a telecommunication network, sometimes also referred to as a cellular radio system, cellular network or cellular communication system. The communication may be performed e.g. between two wireless devices, between a wireless device and a regular telephone and/or between a wireless device and a server via a Radio Access Network (RAN) and possibly one or more core networks, comprised within the cellular communication network. The wireless device may further be referred to as a mobile telephone, cellular telephone, laptop, Personal Digital Assistant (PDA), tablet computer, just to mention some further examples. Wireless devices may be so called Machine to Machine (M2M) devices or Machine Type of Communication (MTC) devices, i.e. devices that are not associated with a conventional user.

The wireless device may be, for example, portable, pocket-storable, hand-held, computer-comprised, or vehicle-mounted mobile device, enabled to communicate voice and/or data, via the RAN, with another entity, such as another wireless device or a server.

The wireless communication network may cover a geographical area which is divided into cell areas, wherein each cell area is served by at least one base station, or Base Station (BS), e.g. a Radio Base Station (RBS), which sometimes may be referred to as e.g. “eNB”, “eNodeB”, “NodeB”, “B node”, “gNB”, or BTS (Base Transceiver Station), depending on the technology and terminology used. The base stations may be of different classes such as e.g. macro eNodeB, home eNodeB or pico base station, based on transmission power and thereby also cell size. A cell is typically identified by one or more cell identities. The base station at a base station site may provide radio coverage for one or more cells. A cell is thus typically associated with a geographical area where radio coverage for that cell is provided by the base station at the base station site. Cells may overlap so that several cells cover the same geographical area. By the base station providing or serving a cell is typically meant that the base station provides radio coverage such that one or more wireless devices located in the geographical area where the radio coverage is provided may be served by the base station in said cell. When a wireless device is said to be served in or by a cell this implies that the wireless device is served by the base station providing radio coverage for the cell. One base station may serve one or several cells. Further, each base station may support one or several communication technologies. The base stations communicate over the air interface operating on radio frequencies with the wireless device within range of the base stations.

In some RANs, several base stations may be connected, e.g. by landlines or microwave, to a radio network controller, e.g. a Radio Network Controller (RNC) in Universal Mobile Telecommunication System (UMTS), and/or to each other. The radio network controller, also sometimes termed a Base Station Controller (BSC) e.g. in GSM, may supervise and coordinate various activities of the plural base stations connected thereto. GSM is an abbreviation for Global System for Mobile Communication (originally: Groupe Special Mobile), which may be referred to as 2nd generation or 2G.

UMTS is a third generation mobile communication system, which may be referred to as 3rd generation or 3G, and which evolved from the GSM, and provides improved mobile communication services based on Wideband Code Division Multiple Access (WCDMA) access technology. UMTS Terrestrial Radio Access Network (UTRAN) is essentially a radio access network using wideband code division multiple access for wireless devices. High Speed Packet Access (HSPA) is an amalgamation of two mobile telephony protocols, High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), defined by 3GPP, that extends and improves the performance of existing 3rd generation mobile telecommunication networks utilizing the WCDMA. Such networks may be named WCDMA/HSPA.

The expression downlink (DL) may be used for the transmission path from the base station to the wireless device. The expression uplink (UL) may be used for the transmission path in the opposite direction i.e. from the wireless device to the base station.

In 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), base stations, which may be referred to as eNodeBs or eNBs, may be directly connected to other base stations and may be directly connected to one or more core networks. LTE may be referred to as 4th generation or 4G.

The 3GPP has undertaken to evolve further the LITRAN and GSM based radio access network technologies, for example into evolved LITRAN (E-UTRAN) used in LTE.

The 3GPP has also standardized and are working with developmentof a next generation, i.e. fifth generation (5G), wide area network, which may be referred to as 5G New Radio (NR), or simply NR, with NR referring at least to the part relating to the radio access technology (RAT) or RAN. The 3GPP 5G has both a radio and core network. In NR the base stations are typically referred to as gNBs.

Quasi Co-Location (QCL) is e.g. defined in the NR specification 3GPP TS 38.214, see e.g. V16.3.0, chapter 5.1.5 “Antenna ports quasi co-location”: Two antenna ports are said to be quasi co-located if the properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed.

Antenna port is thus a logical concept, not a physical concept, i.e. different antenna ports are not necessary the same as different physical antennas or antenna elements. Each antenna port can be considered to represent a specific channel model, and is typically associated with its own reference signal.

QCL relates to how a wireless device, e.g. UE, can use channel characteristics for one antenna port and apply it to another. This may improve receiver performance and speed up channel estimation.

For example, normally two signals transmitted from same antenna port experience the same radio channel but signals transmitted from two different antenna ports experience different radio conditions. However, there may be cases and situations where transmission from two different antenna ports involves radio channels having common properties. In such cases the antenna ports said to be quasi co-located.

Another example is two signals A and B transmitted from say antenna ports 1 and 2, respectively. It is known or found that both signals experiences some common radio channel property, say with regard to Doppler spread, then antenna ports 1 and 2 may be referred to as quasi co-location, or quasi co-located, antenna ports and said signals A and B may referred to as quasi co-location, or quasi co-located, signals, at least regarding said property.

There are four types of QCL defined in said 3GPP TS 38.214, chapter 5.1.5:

- 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread} - 'QCL-TypeB': {Doppler shift, Doppler spread}

- 'QCL-TypeC: {Doppler shift, average delay}

- 'QCL-TypeD': {Spatial Rx parameter}

Each type is thus associated with certain one or more properties that correspond to common radio channel properties.

In 5G NR, QCL relations may e.g. be addressed to Synchronization Signal Block (SSB) or Channel State Information Reference Signal (CSI-RS) reference identities corresponding to antenna ports. A QCL relation identifies two antenna ports as quasi colocated with respect to radio properties according to QCL type.

The QCL relations are configured through Transmission Configuration Indicator (TCI) states including one or two non-overlapping (in terms of properties) of the types above.

The QCL relations are defined by the network and signaled to the UE as TCI states, where each TCI state corresponds to one or more QCL relations. A TCI state may relate to two different QCL types that can be considered to correspond to two QCL relations. QCL relations are based on a design that depends on channel structuring and gNB functionality. Also antenna design and radio deployment has impact on QCL. Designing QCL relations is not a straightforward by the book task but a complex multidimensional trade-off choice weighting advantages of a QCL relation vs UE channel estimation speed and performance. Hence, since the radio channel depends on the environment and deployment the best QCL design may very well differ between different sites and radios.

The potential benefit from QCL is great but at the same time can a bad QCL relation potentially cause more harm than benefit.

SUMMARY

In view of the above, an object is to provide one or more improvements in relation to the prior art, in particular to provide improvements regarding quasi co-location functionality in a wireless communication network, e.g. a telecommunication network, in particular when the network is a 3GPP network, such as a 5G NR network.

According to a first aspect of embodiments herein, the object is achieved by a first method, performed by a wireless device operative in a wireless communication network. The method is for supporting use of quasi co-location (QCL) antenna ports in the wireless communication network. The wireless device receives a pair of signals transmitted by a pair of antenna ports, respectively, of the wireless communication network. The wireless device determines, based on the received signals, a QCL quality indicator indicating a quality of QCL regarding said antenna ports and one or more radio channel properties. The wireless device sends, to the wireless communication network, a report identifying said determined QCL quality indicator and said received signals.

According to a second aspect of embodiments herein, the object is achieved by a second method, performed by a wireless communication network. The second method is also for supporting use of QCL antenna ports in the wireless communication network. The wireless communication network transmits, to a wireless device operative in the wireless communication network, a pair of signals by a pair of antenna ports, respectively, of the wireless communication network. The wireless communication network receives, from the wireless device, a report identifying a QCL quality indicator indicating a quality of QCL regarding said antenna ports and one or more radio channel properties. The QCL quality indicator was determined by the wireless device based on said transmitted pair of signals received by the wireless device.

According to a third aspect of embodiments herein, the object is achieved by a wireless device configured to be operative in a wireless communication network. The wireless device is for supporting use of QCL antenna ports in the wireless communication network. The wireless device is configured to receive a pair of signals transmitted by a pair of antenna ports, respectively, of the wireless communication network. The wireless device is further configured to determine, based on the received signals, a QCL quality indicator indicating a quality of QCL regarding said antenna ports and one or more radio channel properties, Moreover, the wireless device is configured to send, to the wireless communication network, a report identifying said determined QCL quality indicator and said received signals.

According to a fourth aspect of embodiments herein, the object is achieved by one or more network nodes configured to be operative in a wireless communication network. Said one or more network nodes are for supporting use of QCL antenna ports in the wireless communication network and configured to transmit, to a wireless device operative in the wireless communication network, a pair of signals by a pair of antenna ports, respectively, of the wireless communication network. The one or more network nodes are further configured to receive, from the wireless device, a report identifying a QCL quality indicator indicating a quality of QCL regarding said antenna ports and one or more radio channel properties, which QCL quality indicator was determined by the wireless device based on said transmitted pair of signals received by the wireless device.

By letting the wireless device determine the QCL quality indicator and inform the network of this via the report, the risk of the wireless communication network maintaining and using QCL relations that are not efficient or useful, or that may even cause more harm than usefulness, can be reduced, i.e. improved QCL relations are enabled in the network. The wireless communication network can also e.g. use information in the report to improve, e.g. remove and/or update, information on QCL relations, in e.g. in an automated manner. Resulting updated QCL relations can then be communicated, e.g. via TCI state in case of a 3GPP network, e.g. NR network, to wireless devices. Also, the report enables machine learning and/or artificial intelligence to be used to improve the QCL relations, since it is way of providing feedback and adapt accordingly. Moreover, the network becomes able to provide QCL relations that can be more wireless device specific than currently possible.

BRIEF DESCRIPTION OF THE DRAWINGS

Examples of embodiments herein are described in more detail with reference to the appended schematic drawings, which are briefly described in the following.

Figure 1 is a block diagram schematically depicting an example of a communication system to be used for discussing embodiments herein and in which embodiments herein may be implemented.

Figure 2 depicts a combined signaling diagram and flowchart, to be used to discuss embodiments herein.

Figure 3 is a flowchart schematically illustrating embodiments of a first method according to embodiments herein.

Figure 4 is a schematic block diagram for illustrating embodiments of how a wireless device may be configured to perform the first method.

Figure 5 is a flowchart schematically illustrating embodiments of a second method according to embodiments herein.

Figure 6 is a schematic block diagram for illustrating embodiments of how one or more network nodes may be configured to perform the second method. Figure 7 is a schematic drawing illustrating some embodiments relating to computer program(s) and carriers thereof to cause the wireless device and the one or more network nodes to perform said method and related actions.

DETAILED DESCRIPTION

Throughout the following description similar reference numerals may be used to denote similar elements, units, modules, circuits, nodes, parts, items or features, when applicable. Features that appear only in some embodiments of what is shown in a figure, are typically indicated by dashed lines in the drawings.

Embodiments herein are illustrated by exemplary embodiments. It should be noted that these embodiments are not necessarily mutually exclusive. Components from one embodiment may be tacitly assumed to be present in another embodiment and it will be obvious to a person skilled in the art how those components may be used in the other exemplary embodiments.

As a development towards embodiments herein, the situation indicated in the Background will first be further elaborated upon.

A badly designed QCL relation can lead to poor UE channel estimation and receiver performance. It can also result in that the UE uses a bad receiver and transmitter beam or even selects wrong antenna panel. With 5G NR, increased use of beamforming, more complex physical antenna designs etc., the benefits with QCL may be increasingly difficult to reach in practice, since it, as mentioned in the Background, already without this is a complex problem. Hence it has been identified a risk that current QCL may be less useful, or even harmful, in practice for 5G NR networks. At the same time, such networks could potentially benefit a lot from good QCL relations. Further, something that adds to the complexity is that different UE and UE chip set vendors have different receiver and channel detection designs and thus may a QCL relation that works well for one of them, not necessarily work equally good for another.

There is currently no obvious way to monitor the QCL quality at the network side although some indirect measure can possibly be used, indicating a bad choice of QCL relation. It has been found that detecting QCL quality and its impact on receiver channel estimation is best done by the UE. However, no reporting UE to gNB of QCL quality exists. Embodiments herein are based on the UE determining a QCL quality indicator indicating a quality of a QCL relation and reporting this to the network. Embodiments also relate to how this can be done and to various triggers for when such reporting may be performed. The QCL quality indicator may be determined, e.g. computed, based on signals that the UE has received from a pair of antenna and measured regarding certain radio properties. The UE may use the result from the measurement to determine, e.g. compute, the QCL quality indicator. The QCL relation associated with the indicator thus being with regard to said par of antenna ports and said radio properties.

For example, embodiments herein may involve introduction of a new UE report containing QCL quality indicator and/or a measure and/or indication for a QCL relation. The QCL quality indicator may be represented by a QCL offset, and may be reported in groups and/or e.g. per QCL relation, such as per TCI state. The report can be event- triggered, e.g. by “not good enough”, or threshold-based, or on a demand and/or quantified measure of a QCL difference, such as a difference between measured properties that ideally should be the same in case of quasi co-location. Also, any new detected “good enough” antenna port can be reported through such report, as e.g. a potentially new QCL relation or potentially new TCI state. Information on the QCL relation, e.g. QCL quality indicator, such as QCL offset information, may be carried in an updated or additional field in existing signaling, e.g. in the Uplink Control Information (UCI) when the network is a 3GPP NR network.

Hence, thanks to embodiments herein, the network is enabled to monitor quality of the employed QCL relation design and use this for adjustments and/or improvement of the relations and/or design. For example, embodiments herein enable introduction of dynamic QCL functions including machine learning (ML) and artificial intelligence (Al) solutions for QCL relation on different refinement levels, such as: a) Per radio type: macro, street cell, indoor, highway or high-speed train b) Radio network type: high-rise, dense urban, sub-urban, rural c) Per UE type adapting to its receiver design d) Individually per radio site adapting to each environment e) Individually per UE adapting to each environment

Embodiments herein also enables compensation with other features for making the QCL working better. Such as reference signal design and beam-forming. Figure 1 is a block diagram schematically depicting an example of a communication system 10 to be used for discussing embodiments herein in some detail and in which embodiments herein may be implemented. The communication system 10 comprises a wireless communication network 100, e g. a telecommunication network. The wireless communication network 100 may comprise a Radio Access Network (RAN) 211 part and a core network (CN) 102 part. The wireless communication network 100 is typically a telecommunication network or system, such as a cellular communication network that supports at least one Radio Access Technology (RAT), e.g. LTE, or 4G, New Radio (NR) that also may be referred to as 5G. The wireless communication network 110 may thus be a NR network, i.e. a 5G network, such as specified by 3GPP.

The wireless communication network 100 comprises network nodes that are communicatively interconnected. The network nodes may be logical and/or physical and are located in one or more physical devices. The wireless communication network 100, typically the RAN 201 , comprises a radio network node 110, i.e. a network node being or comprising a radio transmitting network node, such as base station, and/or that are being or comprising a controlling node that controls one or more radio transmitting network nodes. Said radio network node may e.g. be communicatively connected, such as configured to communicate, over, or via, a communication interface or communication link with other radio network nodes, e.g. a radio network node 111, comprised in the RAN. When the network 100 is a NR network, the radio network nodes 110, 111 are typically referred to as gNBs.

Further, the wireless communication network 100, or rather the CN 102 typically comprises one or more core network nodes, e.g. a core network node 112, that may be communicatively connected, such as configured to communicate, over, or via, another communication interface or communication link, with radio network nodes of the RAN 101, e.g. with the radio network node 110 and/or 111.

The wireless communication network 100, or specifically one or more network nodes thereof, e.g. the network node 110, is typically configured to serve and/or control and/or manage one or more wireless communication devices, such as a wireless device 120 and a wireless device 121 , in radio coverage areas, i.e. an area where radio coverage is provided for communication with one or more communication devices. The wireless devices may alternatively be named wireless communication devices, UEs etc. as explained elsewhere herein. Each radio coverage may be provided by and/or associated with a particular Radio Access Technology (RAT). The radio coverage may be radio coverage of a radio beam, that simply may be named a beam. As should be recognized by the skilled person, a beam is typically a more dynamic and relatively narrow and directional radio coverage compared to a conventional cell, and may be accomplished by so called beamforming. A beam is typically for serving one or a few wireless devices at the same time, and may be specifically set up for serving this one or few wireless devices. The beam may be changed dynamically by beamforming to provide desirable coverage for the one or more wireless devices being served by the beam. There may be more than one beam provided by one and the same network node.

In the figure it is also schematically shown signals 116a-c, transmitted by the wireless communication network 100, more specifically, in the shown example, the signals 116a-b are transmitted by the radio network node 110 and the signal 116c by the radio network node 111. The figure also schematically shows antenna ports 115a-c that transmits the signals 116a-c, respectively. As used herein, antenna port may be as defined by 3GPP and as stated above. Different antenna ports are thus not necessary the same as different physical antennas or antenna elements. Each antenna port can be considered to represent a specific channel model, and is typically associated with its own reference signal.

In the figure it is also shown a remote device 131, e.g. remote network node, and a remote computer network 130 that the remote device 131 may be part of or connected to. The remote computer network 130 may correspond to a so called computer cloud, or simply cloud, providing certain services. The remote device 131 and/or remote network 130 may e.g. be communicatively connected to the wireless communication network 100, e.g. to one or more devices and/or nodes thereof, such as the CN 101 and core network node 112.

Attention is drawn to that Figure 1 is only schematic and for exemplifying purpose and that not everything shown in the figured may be required for all embodiments herein, as should be evident to the skilled person. Also, a communication system and wireless communication network that correspond(s) to the ones shown in the figure will typically comprise several further device, network nodes and details, as realized by the skilled person, but which are not shown herein for the sake of simplifying.

Figure 2 depicts a combined signaling diagram and flowchart, which will be used to discuss embodiments herein. The actions below, which may form one or more methods, relate to supporting use of QCL antenna ports in a wireless communication network, e.g. the wireless communication network 100.

As used herein, quasi co-located antenna ports may be as defined by 3GPP (see definition above). In accordance with the explanation provided above, and as should be recognized by the skilled person, the purpose with QCL is that a wireless device should be able to decide on certain parameters used for reception of one signal, from a first antenna port, based on knowledge of said parameters for another signal, from another, second antenna port. In other words QCL and e.g. QCL first and second antenna ports may, as used herein, refer to that radio channel properties of a first radio channel from the first antenna port are or should be valid also for another, second radio channel from another, the second antenna port, which can be utilized so that a known parameter used for reception of a first signal over the first radio channel can be used to receive a second signal over the second radio channel.

Below, actions performed by the wireless communication network 100 may in practise be performed by one or more network nodes thereof, typically radio network nodes, such as the radio network nodes 110 and/or 111 , but further and other nodes of the network may be involved as well.

The actions below may be taken in any suitable order and/or be carried out fully or partly overlapping in time when this is possible and suitable.

Action 201

The wireless communication network 100 may send, and the wireless device 120 may receive, QCL identifying information identifying a pair of signals, e.g. signals 116a-b, and one or more radio channel properties. Said one or more radio channel properties being radio channel properties that the wireless communication network 100 has identified as at least potentially shared between a pair of antenna ports, e.g. the antenna ports 115a-b, of the wireless communication network 100

The QCL identifying information may, e.g. in case of a 3GPP network, comprise or correspond to one or more configured TCI states that may have been configured for and/or assigned to the wireless device 120 by the wireless communication network 100. Each state corresponding to a QCL relation identifying at least potential quasi co-location between two antenna ports, such as identified through said pair of signals 116a-b, e.g. a Synchronization Signal Block (SSB) and a Channel State Information Reference Signal (CSI-RS), associated with said antenna ports, respectively. The QCL identifying information, at least a part thereof that identifies said one or more radio channel properties, may identify these properties through one or more predetermined types or classes, which may be named QCL types or classes, each type identifying predetermined one or more radio channel properties, e.g. through Types A-D as specified in said 3GPP TS 38.214, chapter 5.1.5. Each type may be associated with and/or be defined for a certain application area, e.g. involving application: to obtain CSI (such as Types A-B), to obtain reference signal measurement (such as Type C), and/or to support beamforming (such as Type D).

The network may thus e.g. configure a TCI state, corresponding to a QCL relation, and assign it to the wireless devices by said QCL identifying information. The network may this way inform the wireless device which TCI state, and thereby QCL relation, that should be used for a certain reception.

There may be a maximum amount of configured TCI states available, e.g. 64. A configured TCI state assigned by the network to the wireless device may be referred to as an active TCI state. However, it should be noted that active TCI states also may have another meaning, viz. to refer to a subset available TCI states, e.g. to 8 configured states of 64 available ones, for signaling reasons. For example, said 8 TCI states can then be referred to by a 3 bit sequence in DCI (Downlink Control Indicator).

The QCL identifying information is further commented below.

Action 202

The wireless communication network 100 transmits said pair of signals 116a-b by said pair of antenna ports 115a-b, respectively, and the wireless device 120 receives the signals 116a-b. The receipt of said pair of signals 116a-b may be based on said QCL identifying information in Action 201 when such has been received, i.e. the wireless device may use the QCL identifying information to receive the signals, e.g. know which signals to receive and how.

Action 203

The wireless device 120 determines, based on the received signals 116a-b, a QCL quality indicator indicating a quality of QCL regarding said antenna ports 115a-b and one or more radio channel properties.

Determining the QCL quality indicator may comprise measuring said signals 116a-b regarding at least one of said one or more radio channel properties. The one or more radio properties may be at least one of radio channel properties indicted in the QCL identifying information when such has been received in Action 201. For example, the measuring may involve measuring spatiality regarding beams carrying said SSB and CSI- RS, such as measuring whether the best, typically in terms of Reference Signal Received Power (RSRP), wireless device beam and/or panel for receiving the SSB is the best beam and/or panel also for receiving the CSI-RS.

Said measuring may comprise measuring a difference between said signals 116a-b. For example, in a perfect reality with perfect quasi co-location regarding a property, they are the same between the signals. Hence the difference measures how well or badly quasi co-located the antenna ports are. The measured difference may thus be considered to correspond to a QCL offset, since ideally the properties shall be the same and thus no measured difference.

In some embodiments, the QCL quality indicator corresponds to or comprises the measured difference. As realized after the above explanation, the measured difference is a measure and/or indication of QCL quality.

In some embodiments, the present action relates to that the wireless device determines the quasi- co-location quality status to be “working” or “not working”, or, “ok” or “not ok”. This may be based on the measured difference or that the wireless device finds some other problem with the receipt of any one or both the signals 116a-b, which problem is not expected in case of QCL. The wireless device 120 may perform some evaluation, such as checking if the said one or more radio channel properties associated with the quasi co-location are the same, or substantially same, or at least if they are sufficiently close to each other so that the property from one port can be considered a valid or useful property of the other port.

In some embodiments, the determination of the QCL quality indicator comprises comparing result from the measuring with certain one or more threshold levels. The threshold levels, i.e. reference levels, may e.g. relate or correspond to a value that the wireless device compares with to e.g. determine if the QCL quality is ok, such as sufficient, or not. There may be threshold level identifying information, identifying at least one of said one or more threshold levels, that the wireless device 120 receives from the wireless communication network 100, e.g. separate from and/or as part of said QCL identifying information in Action 201. These threshold levels may have been defined by the wireless communication network 100 and/or, in some embodiments, at least one of said one or more threshold levels is predefined. Such threshold level may e.g. specify a level, e.g. minimum level, required for the wireless device 120 to be able to benefit from the quasi co-location, and/or e.g. relating to what is “good enough”. It may be predefined in e.g. a standard, and/or by the wireless device 120, e.g. by the vendor thereof and/or based on wireless device specific requirements, and/or be predefined by an operator and/or vendor of the wireless communication network 100 and signaled to the wireless device 120, e.g. as part of the QCL identifying information in Action 201. In some embodiments some of said one or more threshold levels is/are predefined and some, e.g. remaining, of said threshold level(s) is/are received by the wireless device 120 in the threshold level identifying information.

In some embodiments, said one or more threshold levels comprise a measurement by the wireless device 120 on another signal, e.g. 116c, of corresponding type as at least one of said pair of signals 116a-b. Said another signal 116c being one that the wireless device 120 has detected as potentially better regarding QCL than one of said signals 116a-b. The wireless device 120 may e.g. be aware the other signal as a better signal than any one of quasi co-located signals 116a-b it has been informed about from the wireless communication network 100, e.g. through the QCL identifying information in Action 201 , e.g. through a configured TCI state. The wireless device 120 may already be aware of such another signal 116c prior to the determination in the present action, or may find it in response to evaluation of one or more of said received pair of signals 116a-b, where the evaluation indicates at least one of them as not sufficiently good and/or not as expected in case of QCL.

As may be realized from the above, the wireless device determining the QCL quality indicator may comprise that the wireless device 120 computes it based on said pair of signals 116a-b that the wireless device 120 has received and measured. For example, the result from the measurement, i.e. the measured signals, may be used to compute the QCL quality indicator. Examples are found above and some are separately discussed below.

Action 204

The wireless device 120 sends, and the wireless communication network 100 receives a report identifying said determined QCL quality indicator and said received signals 116a-b.

Said signals 116a-b may be explicitly or implicitly identified in the report. They may be implicitly identified e.g. by that the wireless communication network 100 already have knowledge of the signals, e.g. by having knowledge about QCL relation currently being used by the wireless device, e.g. corresponding to an assigned, or active, TCI state of the wireless device 120. The wireless device 120 may have been informed about this through the QCL identifying information in Action 201. In other words, the wireless communication network 100 may in some embodiments already know that the report is with regard to said signals 116a-b and said antenna ports 115a-b that transmitted the signals.

Said one or more radio channel properties associated with the quasi co-location may at least partly be predefined or predetermined, or may at least partly have been signaled to the wireless device by the network, e.g. though the QCL identifying information in Action 201. The radio channel properties may be of predefined types and/or classes, with e.g. one or more different properties grouped per type or class, such as the QCL types Types A-D as specified in said 3GPP TS 38.214, chapter 5.1.5. Said one or more radio channel properties may e.g. relate to one or more of the radio channel properties defined by these types, i.e. one or more of the following: doppler shift, doppler spread, average delay, delay spread, spatial receiver parameter(s).

When determination of the QCL quality indicator involves measuring such difference between said signals 116a-b as discussed above under Action 203, the report may identify the measured difference. The report may in this case be referred to as a QCL offset report.

The measured difference, or a quantified version of it, may be comprised in the report or there may be an identifier, e.g. certain bits with predetermined meaning, such as through standardization, that identifies the quantified measured difference. The measured difference can thanks to this then be used by the network to evaluate how good or bad the quasi co-location is and e.g. be used to confirm a current TCI state in use, corresponding to an active TCI state, or initiate a change, e.g. update, of it. As already indicated, ideally there should be no difference between the signals regarding said one or more radio channel properties associated with the quasi co-location, since the basic idea with quasi co-located antenna port is that there is at least some radio channel property that is the same or substantially the same between the ports.

For embodiments where said one or more threshold levels comprise said measurement by the wireless device 120 on said another signal 116c, as discussed above under Action 203, the report preferably comprises signal identifying information identifying said another signal 116c. This way the wireless device 120 can, via the report, contribute with further information that can be used by the network to maintain and/or improve information on quasi co-located antenna ports and related signals, e.g. maintain and/or improving TCI states.

In some embodiments, sending the report is triggered by a request, received by the wireless device 120 and transmitted by the wireless communication network 100, requesting the wireless device 120 to send such report. There may be one report triggered by each request, or there may be one received request that triggers several reports. The wireless communication network 100 may e.g. switch on/off sending of reports by the request.

In some embodiments, each determination of QCL quality indicator triggers sending a report identifying the determined QCL quality indicator. In some embodiments, the report is sent triggered by some internal event in the wireless device.

Moreover, om some embodiments, sending of the report is triggered by certain determined QCL quality indicator. For example, only quasi co-location quality status that indicate and/or correspond to a problem with the quasi co-location may be reported, such as a significant measured difference between the signals, and/or a determined status corresponding to “not ok” or “not good enough”, e.g. resulting from comparison with a threshold value, such as mentioned above. In other words, if the result is that the QCL is not ok or insufficient for some reason, the report may be sent. Hence, absence of a report can be taken as indication that current quasi co-location is ok and/or at least may continue to be used.

Note that in some other embodiments, the report is being sent independent on the result from the determination.

Further, the report may be comprised in a Channel State Information (CSI) part of Uplink control Information (UCI), e.g. in embodiments where the network is a NR network. The UCI typically transmitted on the Physical Uplink Control Channel (PUCCH) and/or Physical Uplink Shared Channel (PUSCH), thus the report may e.g. be transmitted on PUCCH and/or PUSCH, but also other information, information element and channels may alternatively or additionally comprise and/or carry the report

Action 205

As already indicated above, the wireless communication network may then use received report, or rather the info in it, to update QCL relations, e.g. TCI states. The network may e.g. evaluate how good or bad a current QCL relation is maintains is, e.g. use the info to confirm a current TCI state in use, corresponding to an active TCI state, and/or initiate a change, e.g. update, of it.

In view of the above, it may be noted that the antenna ports 115a-b may not necessarily be quasi co-located from perspective of the wireless device 120, although they may have been so and/or are considered by at least the wireless communication network 100 to be quasi co-located. The wireless device 120 should in such situation preferably detect this as part of determination of the QCL quality indicator and accordingly report, via the report and the QCL quality indicator, that the QCL quality is “bad”, e.g. that the QCL is or may not be sufficient to provide such benefit that is the reason for using QCL.

By, as above, letting the wireless device 120 determine the QCL quality indicator and inform the network of this via the report, the risk of the wireless communication network 100 maintaining and using QCL relations that are not efficient or useful, or even may cause more harm than usefulness, can be reduced, i.e. improved QCL relations are enabled in the network. The wireless communication network 100 can also e.g. use information in the report to improve, e.g. remove and/or update, information on QCL relations, in e.g. in an automated manner. Resulting updated QCL relations can then be communicated, e.g. via TCI state in case of a 3GPP network, to wireless devices. Also, the report enables machine learning and/or artificial intelligence to be used to improve the QCL relations, since it is way of providing feedback and adapt accordingly. Moreover, the network becomes able to provide QCL relations that can be more wireless device specific than currently possible.

Hence, as realized from the above, a new report that may be sent from a wireless device, e.g. the wireless device 120, to the network, e.g. the wireless communication network 100, e.g. a radio network node thereof, such as the radio network node 110, e.g. gNB, may be specified.

The report may contain a quantified QCL difference measure, corresponding to a QCL offset, and/or an indication of e.g., a threshold- triggered event indicating non-QCL relation. The latter may thus indicate that a QCL relation maintained by the network is not actually a QCL relation, at least not from perspective of the wireless device reporting this.

Th report may be separate for, or be separated into, different types of QCL relations, e.g. when several QCL types are reported. For example, QCL may be separated into QCL regarding spatial relations and QCL regarding doppler and/or delay. In case of QCL types as mentioned above, such as defined in said 3GPP TS 38.214, chapter 5.1.5, the separation may be into Type D, reporting about spatial relations and Type A-C, reporting about doppler and delay.

In addition, the report, e.g. threshold triggered, may be sent when a potential new TCI relation is detected, e.g. with quality below a threshold that is not yet configured. The reported information can be collected and/or presented by the network, and be used to reconfigure QCL relations. It can also be used for automated reconfiguration of QCL relations.

The following are some detailed examples in the context of QCL types as mentioned above, such as defined in said 3GPP TS 38.214, chapter 5.1.5.

The UE mentioned below may correspond to the wireless device 120 and the network mentioned below may correspond to the wireless communication network 100.

Example A - Reporting regarding Type D / Spatial QCL relation

This example may e.g. be applicable in a scenario where a UE has beamforming and several antenna panels. This may e.g. be the case with millimetre wave NR UEs. In some environments, the expected spatial relation may fail from reflections on smaller objects such as metal poles or fagade obstacles. The following actions are for describing the example:

A1. A QCL Type D relation is indicated between an SSB and a narrow beam CSI-RS by a configured TCI state. As already mentioned above the network typically communicates this to the UE and this action may thus fully or partly correspond to Action 201 above.

A2. The UE detects that the best UE receiver beam for the SSB is not the best receiver beam for the narrow CSI-RS beam. In other words, identifies that the QCL relation indicated was not good or not valid, i.e. of bad guality.

A3. The UE reports this and may also report a RSRP difference between the QCL SSB receiver beam and the best found receiver beam for the CSI-RS. In other words the UE has determined a QCL guality indicator that is communicated in a report to the network and that indicates the QCL guality according to what the UE detected in A2, i.e. indicates the QCL relation is of bad guality, e.g. not valid. The UE here also provides info on the best found receiver beam for the CSI-RS.

As realized, Actions A2-A3 may fully or partly correspond to Actions 202-204 above. The network thereafter then use the reported info to update QCL relations.

Example B - Reporting regarding Type D / Spatial QCL Relation, threshold triggered For a beamforming UE, a suitable measure for difference in a Type D QCL relation is signals strength achieved with different beams.

The following actions are for describing this example:

B1. A QCL Type D relation is indicated between an SSB and a narrow beam CSI-RS by a configured TCI state. As already mentioned above the network typically communicates this to the UE and this action may thus fully or partly correspond to Action 201 above.

B2. A QCL-diff threshold is configured for Type D difference with a threshold of 3 dB. The threshold and its reporting may be configured and/or requested by the network and info about it be set to and received by the UE, e.g. together with the QCL relation, or separately, and may correspond to info received in Action 201. The info may alternatively be obtained by other means, e.g. as discussed above regarding thresholds under Acton 203.

B3. The UE detects that the best UE receiver beam for the SSB is 3 dB weaker than the receiver beam for the CSI-RS, i.e. difference is at least the threshold.

B4. In response to this detection, i.e. triggered by it, the UE sends a report with the triggered deviation to the network, e.g. gNB.

As realized, Actions B3-B4 may fully or partly correspond to Actions 202-204 above. The network may thereafter use the reported info to update QCL relations.

Example C - Reporting regarding Type A-C doppler and delay, threshold triggered

Type A, B and C have some similarities in that all parameters are measured in time and that they relate to receiver configuration and channel estimation rather than beam forming. The reporting may be defined very similar for them all.

The following actions are for describing this example:

C1. A QCL Type A relation is indicated by a configured TCI state. As already mentioned above the network typically communicates this to the UE and this action may thus fully or partly correspond to Action 201 above.

C2. QCL-diff thresholds on average and spread of doppler and delay are configured. The thresholds and/or their or reporting may be configured and/or requested by the network and info about it be sent to and received by the UE, e.g. together with the QCL relation, or separately, and may correspond to info received in Action 201. The info may alternatively be obtained by other means, e.g. as discussed above regarding thresholds under Acton 203. C3. The UE detects that the doppler spread difference is larger than the configured threshold for doppler spread.

C4. In response to this detection, i.e. triggered by it, the UE sends a report with the triggered deviation to the network, e.g. gNB.

As realized, Actions C3-C4 may fully or partly correspond to Actions 202-204 above.

C5. In response to the received report, i.e. triggered by it, the network, e.g. gNB, reconfigures the QCL relation that the report is about, e.g. by reconfiguring a corresponding TCI state, from Type A to Type C, where Type C does not contain doppler spread. In other words, the network removes doppler spread as a property for QCL since it was reported to deviate too much. This action is thus an example of how the network may use info in the report and may correspond to Action 205 discussed above.

Example D - Reporting regarding Type C average delay, difference reporting

The following actions are for describing this example:

D1. A QCL Type C relation is indicated by a configured TCI state. As already mentioned above the network typically communicates this to the UE and this action may thus fully or partly correspond to Action 201 above.

D2. The network reguests a QCL-diff measurement report from the UE, e.g. sends a reguest to and that is received by the UE, e.g. together with the QCL relation, or separately, and may correspond to info received in Action 201. The info may alternatively be obtained by other means, e.g. as discussed above regarding thresholds under Acton 203.

D3. The UE measures the delay difference according and/or in response to the reguest, e.g. as the time difference in peak of received power delay profile between the different QCL relation ports involved.

D4. The UE reports the time differences measured to the network, e.g. gNB, the UE sends a report with the measured time differences to the network, e.g. gNB, corresponding to a QCL offset that both indicates and guantifies QCL guality since ideally for QCL there should be no difference.

As realized, Actions C3-C4 may fully or partly correspond to Actions 202-204 above.

Example E - Uplink reporting mechanism Uplink Control Information (UCI), e.g. as defined for NR networks, comprises HARQ feedback, Channel State Information (CSI) and Scheduling Request. The CSI part may be extended also to convey also the report as discussed under Action 204 above, e.g. a QCL offset report. For example, 3GPP TS 38.212, see e.g. V16.3.0, section 6.3.1/6.3.2 “Uplink control information on PUCCH/PUSCH”, subsection 6.3.1.1.2 and 6.3.2.1.2 on the CSI- only scenario may be further elaborated to include a UCI bit sequence generation also including QCL quality indictor(s), e.g. QCL offset(s).

Figure 3 is a flowchart schematically illustrating embodiments of a first method according to embodiments herein. The method and actions below may be performed by a wireless device, e.g. the wireless device 120, operative in a wireless communication network, e.g. the wireless communication network 100. The method is for supporting use of quasi co-location, i.e. QCL, antenna ports, e.g. 115a-b, in the wireless communication network. In some embodiments, the wireless communication network is a NR network.

The actions below may be taken in any suitable order and/or be carried out fully or partly overlapping in time when this is possible and suitable.

Action 301

The wireless device 120 may receive, from the wireless communication network 100, QCL identifying information identifying a pair of signals, e.g. signals 116a-b, and one or more radio channel properties. The one or more radio channel properties are, when the present action is performed, typically radio channel properties that the wireless communication network 100 has identified as at least potentially shared between a pair of antenna ports, e.g. 115a-b.

The present action may fully or partly correspond to Action 201 discussed above in relation to Figure 2.

Action 302

The wireless device 120 receives a pair of signals, e.g. the pair of signals 116a-b, that may have been identified in Action 301 , transmitted by a pair of antenna ports, e.g. the antenna ports 115a-b, respectively, of the wireless communication network 100.

When Action 301 above is performed, it is performed prior to the present action and the present action, i.e. the receipt of said pair of signals 116a-b transmitted by the antenna port 115a-b, is based on said QCL identifying information. The present action may fully or partly correspond to Action 202 discussed above in relation to Figure 2.

Action 303

The wireless device 120 determines, based on the received signals 116a-b, a QCL quality indicator indicating a quality of QCL regarding said antenna ports 115a-b and one or more radio channel properties.

Determining the QCL quality indicator may comprise measuring said signals regarding at least one of said one or more radio channel properties. The measuring may comprise measuring a difference between said signals 116a-b. In some embodiments, the determination of the QCL quality indicator comprises comparing result from the measuring with certain one or more threshold levels. Threshold level identifying information, identifying at least one of said one or more threshold levels, may be received by the wireless device 120 from the wireless communication network 100. At least one of said one or more threshold levels may be predefined. Further, said one or more threshold levels may comprise a measurement by the wireless device 120 on another signal, e.g. 116c, of corresponding type as one of said pair of signals 116a-b, which another signal 116c the wireless device 120 has detected as a potentially better signal regarding QCL.

The present action may fully or partly correspond to Action 203 discussed above in relation to Figure 2.

Action 304

The wireless device 120 sends, to the wireless communication network 100, a report identifying said determined QCL quality indicator and said received signals 116a-b. The report may identify the measured difference mentioned above under Action 303. Further, the report may comprise signal identifying information identifying said another signal 116c mentioned above under Action 303.

In some embodiments, sending the report is triggered by a request, received by the wireless device 120 and transmitted by the wireless communication network 100, requesting the wireless device 120 to send such report.

Moreover, in some embodiments, sending the report is triggered by certain determined QCL quality indicator in Action 303.

When the wireless communication network 100 is a NR network, the report may be comprised in a Channel State Information (CSI) part of Uplink control Information (UCI). The present action may fully or partly correspond to Action 204 discussed above in relation to Figure 2.

Figure 4 is a schematic block diagram for illustrating embodiments of how a wireless device 400, e.g. the wireless device 120, may be configured to perform the method and actions discussed above in connection with Figure 3.

Hence, the wireless device 400 is configured to be operative in a wireless communication network, e.g. the wireless communication network 100, and is for supporting use of QCL antenna ports in the wireless communication network 100.

The wireless device 400 may comprise a processing module 401, such as a means, one or more hardware modules, including e.g. one or more processors, and/or one or more software modules for performing said method and/or actions.

The wireless device 400 may further comprise memory 402 that may comprise, such as contain or store, a computer program 403. The computer program 403 comprises 'instructions' or 'code' directly or indirectly executable by the wireless device 400 to perform said method and/or actions. The memory 402 may comprise one or more memory units and may further be arranged to store data, such as configurations and/or applications involved in or for performing functions and actions of embodiments herein.

Moreover, the wireless device 400 may comprise a processors) 404, i.e. one or more processors, as exemplifying hardware module(s) and may comprise or correspond to one or more processing circuits. In some embodiments, the processing module(s) 401 may comprise, e.g. ‘be embodied in the form of’ or ‘realized by’ processor(s) 404. In these embodiments, the memory 402 may comprise the computer program 403 executable by the processor(s) 404, whereby the wireless device 400 is operative, or configured, to perform said method and/or actions thereof.

Typically the wireless device 400, e.g. the processing module(s) 401, comprises Input/Output (I/O) module(s) 405, such as circuitry, configured to be involved in, e.g. by performing, any communication to and/or from other units and/or devices and/or nodes, such as sending and/or receiving information to and/or from other node(s), e.g. sending and/or receiving to/from the wireless communication network 100, such as one or more nodes thereof, e.g. the radio network node 110 and/or 111. The I/O module(s) 405 may be exemplified by obtaining, e.g. receiving, module(s) and/or providing, e.g. sending, module(s), when applicable.

Further, in some embodiments, the wireless device 400, e.g. the processing module(s) 401, comprises one or more of receiving module(s), determining module(s), sending module(s), as exemplifying hardware and/or software module(s) for carrying out actions of embodiments herein. These modules may be fully or partly implemented by the processor(s) 404.

Hence:

The wireless device 400, and/or the processing module(s) 401, and/or the processor(s) 404, and/or the I/O module(s) 405, and/or the receiving module(s) are operative, or configured, to receive said a pair of signals transmitted by said pair of antenna ports, respectively, of the wireless communication network.

The wireless device 400, and/or the processing module(s) 401, and/or the processor(s) 404, and/or the determining module(s), are operative, or configured, to determine, based on the received signals, said QCL quality indicator indicating a quality of QCL regarding said antenna ports and the one or more radio channel properties. In some embodiments, the wireless device being operative or configured to determine the QCL quality indicator comprises that the wireless device is operative or configured to measure said signals regarding at least one of said one or more radio channel properties.

The wireless device 400, and/or the processing module(s) 401, and/or the processor(s) 404, and/or the I/O module(s) 405, and/or the sending module(s) are operative, or configured, to send, to the wireless communication network, said report identifying said determined QCL quality indicator and said received signals.

In some embodiments, the wireless device 400, and/or the processing module(s) 401 , and/or the processor(s) 404, and/or the I/O module(s) 405, and/or the receiving module(s) are operative, or configured, to receive, from the wireless communication network prior to receipt of said pair of signals, said QCL identifying information identifying said pair of signals and said one or more radio channel properties.

Figure 5 is a flowchart schematically illustrating embodiments of a second method according to embodiments herein. The method and actions below may be performed by a wireless communication network, e.g. the wireless communication network 100, or rather one or more network nodes or devices thereof, such as the radio network node 110 and/or 111. The method is for supporting use of quasi co-location, i.e. QCL, antenna ports, e.g. 115a-b, in the wireless communication network. In some embodiments, the wireless communication network is a NR network.

The actions below may be taken in any suitable order and/or be carried out fully or partly overlapping in time when this is possible and suitable. Action 501

The wireless communication network 100 may send, to the wireless device 120, QCL identifying information identifying a pair of signals, e.g. 116a-b, and one or more radio channel properties. Said one or more radio channel properties being radio channel properties that the wireless communication network 100 has identified as at least potentially shared between said pair of antenna ports 115a-b.

The present action may fully or partly correspond to Action 201 discussed above in relation to Figure 2.

Action 502

The wireless communication network 100 transmits, to a wireless device, e.g. the wireless device 120, operative in the wireless communication network 100, a pair of signals, e.g. 116a-b, that may have been identified in Action 501 , by a pair of antenna ports, e.g. 115a-b, respectively, of the wireless communication network 100.

When Action 501 above is performed, it is performed prior to the present action, whereby the wireless device 120 in the present action can receive said transmitted pair of signals 116a-b based on said QCL identifying information.

The present action may fully or partly correspond to Action 202 discussed above in relation to Figure 2.

Action 503

The wireless communication network 100 receives, from the wireless device 120, a report identifying a QCL quality indicator indicating a quality of QCL regarding said antenna ports 115a-b and one or more radio channel properties, wherein the QCL quality indicator was determined by the wireless device 120 based on said transmitted pair of signals 116a-b received by the wireless device 120. When Action 501 above is performed, the pair of signals 116a-b and the radio channel properties of the present action may be as identified by the QCL identifying information.

In some embodiments, said determination of the QCL quality indicator by the wireless device 120 comprised that the wireless device 120 measured said signals regarding at least one of said one or more radio channel properties. Further, said measurement of said signals by the wireless device 120 may have comprised that the wireless device 120 measured a difference between said signals 116a-b. Said report may then identify the measured difference. In some embodiments, the determination of the QCL quality indicator by said wireless device 120 comprised a comparison of result from the measurement with certain one or more threshold levels. Threshold level identifying information identifying at least one of said one or more threshold levels may have been transmitted by the wireless communication network 100 for receipt by the wireless device 120. At least one of said one or more threshold levels may be predefined. Said one or more threshold levels may comprise a measurement by the wireless device 120 on another signal, e.g. 116c, of corresponding type as one of said pair of signals 116a-b, which another signal 116c the wireless device 120 has detected as a potentially better signal regarding QCL than said one of said pair of signals 116a-b. The report may then comprises signal identifying information identifying said another signal 116c.

In some embodiments, the wireless communication network 100 has transmitted a request, for receipt by the wireless device 120, requesting the wireless device 120 to send the report and wherein the wireless device 120 sent the report triggered by receipt of this request.

In some embodiments, the wireless device 120 sent the report triggered by that the wireless device 120 determined a certain QCL quality indicator.

When the wireless communication network 100 is a NR network, the report may be comprised in a Channel State Information (CSI) part of Uplink control Information (UCI)

The present action may fully or partly correspond to Action 204 discussed above in relation to Figure 2.

Figure 6 is a schematic block diagram for illustrating embodiments of how one or more network nodes 600 or devices of a wireless communication network, e.g. the wireless communication network 100, may be configured to perform the method and actions discussed above in connection with Figure 5, whereby the wireless communication network become configured to perform said method and actions. The one or more network nodes 600 may correspond to a part or a system of the wireless communication network and may e.g. comprise or correspond to the radio network node(s) 110 and/or 111.

Hence, said one or more network nodes 600 are configured to be operative in a wireless communication network, e.g. the wireless communication network 100, and are for supporting use of QCL antenna ports in the wireless communication network 100. The one or more network nodes 600 may comprise processing module(s) 601, such as a means, one or more hardware modules, including e.g. one or more processors, and/or one or more software modules for performing said method and/or actions.

The one or more network nodes 600 may further comprise memory 602 that may comprise, such as contain or store, computer program(s) 603. The computer program(s) 603 comprises 'instructions' or 'code' directly or indirectly executable by the one or more network nodes 600 to perform said method and/or actions. The memory 602 may comprise one or more memory units and may further be arranged to store data, such as configurations and/or applications involved in or for performing functions and actions of embodiments herein.

Moreover, the one or more network nodes 600 may comprise processor(s) 604, i.e. one or more processors, as exemplifying hardware module(s) and may comprise or correspond to one or more processing circuits. In some embodiments, the processing module(s) 601 may comprise, e.g. ‘be embodied in the form of’ or ‘realized by’ processor(s) 604. In these embodiments, the memory 602 may comprise the computer program(s) 603 executable by the processor(s) 604, whereby the one or more network nodes 600 are operative, or configured, to perform said method and/or actions thereof.

Typically the one or more network nodes 600, e.g. the processing module(s) 601, comprises Input/Output (I/O) module(s) 605, such as circuitry, configured to be involved in, e.g. by performing, any communication to and/or from other units and/or devices and/or nodes, such as sending and/or receiving information to and/or from other node(s), e.g. sending and/or receiving to/from the wireless device 120, the wireless device 121 and other node(s) and/or device(s) relating to the wireless communication network 100. The I/O module(s) 605 may be exemplified by obtaining, e.g. receiving, module(s) and/or providing, e.g. sending, module(s), when applicable.

Further, in some embodiments, the one or more network nodes 600, e.g. the processing module(s) 601 , comprises one or more of sending module(s), transmitting module(s) and receiving module(s), as exemplifying hardware and/or software module(s) for carrying out actions of embodiments herein. These modules may be fully or partly implemented by the processor(s) 604.

Hence:

The one or more network nodes 600, and/or the processing module(s) 601 , and/or the processor(s) 604, and/or the I/O module(s) 605, and/or the transmitting module(s) are operative, or configured, to transmit, to the wireless device operative in the wireless communication network, said pair of signals by said pair of antenna ports, respectively, of the wireless communication network.

The one or more network nodes 600, and/or the processing module(s) 601 , and/or the processor(s) 604, and/or the I/O module(s) 605, and/or the receiving module(s) are operative, or configured, to receive, from the wireless device, said report identifying the QCL quality indicator indicating the quality of QCL regarding said antenna ports and said one or more radio channel properties.

In some embodiments, the one or more network nodes 600, and/or the processing module(s) 601, and/or the processor(s) 604, and/or the I/O module(s) 605, and/or the sending module(s) are operative, or configured, to send, to the wireless device, prior to transmission of said pair of signals, said QCL identifying information identifying said pair of signals and said one or more radio channel properties that the wireless communication network has identified as at least potentially shared between said pair of antenna ports.

Figure 7 is a schematic drawing illustrating some embodiments relating to computer programs and carriers thereof to cause said wireless device 400 and network node(s) 600 discussed above to perform said first method and second method, and related actions. The computer program(s) may be or comprise the computer programs 403 and/or 603 and comprises instructions that when executed by the processors 404, 604 and/or the processing modules 401, 601 causes the wireless device 400 and/or the network node(s) 600, and thereby the wireless communication network 100, to perform as described above. In some embodiments there is provided carrier(s), that may be named data carrier(s), e.g. computer program product(s), comprising the computer programs 403 and/or 603. Such carrier may be one of an electronic signal, an optical signal, a radio signal, and a computer readable storage medium, e.g. a computer readable storage medium 701 as schematically illustrated in the figure. Any one, some or all of the computer programs 403, 603 may thus be stored on the computer readable storage medium 701. By carrier may be excluded a transitory, propagating signal and the data carrier may correspondingly be named non-transitory data carrier. Non-limiting examples of the carrier being a computer readable storage medium is a memory card or a memory stick, a disc storage medium such as a CD or DVD, or a mass storage device that typically is based on hard drive(s) or Solid State Drive(s) (SSD). The computer readable storage medium 701 may be used for storing data accessible over a computer network 702, e.g. the Internet or a Local Area Network (LAN). Any one, some or all of the computer programs 403, 603 may furthermore be provided as pure computer program(s) or comprised in a file or files. The file or files may be stored on the computer readable storage medium 1201 and e.g. available through download e.g. over the computer network 702 as indicated in the figure, e.g. via a server. The server may e.g. be a web or File Transfer Protocol (FTP) server. The file or files may e.g. be executable files for direct or indirect download to and execution on the wireless device 400 and/or the network node(s) 600, to cause performance as described above, e.g. by execution by any one, some or all of the processing circuits 404, 604. The file or files may also or alternatively be for intermediate download and compilation involving the same or another processor to make them executable before further download and execution causing the wireless device 400 and/or the network node(s) 600 to perform as described above.

Note that any processing module(s) and circuit(s) mentioned in the foregoing may be implemented as a software and/or hardware module, e.g. in existing hardware and/or as an Application Specific Integrated Circuit (ASIC), a field-programmable gate array (FPGA) or the like. Also note that any hardware module(s) and/or circuit(s) mentioned in the foregoing may e.g. be included in a single ASIC or FPGA, or be distributed among several separate hardware components, whether individually packaged or assembled into a System-on-a-Chip (SoC).

Those skilled in the art will also appreciate that the modules and circuitry discussed herein may refer to a combination of hardware modules, software modules, analogue and digital circuits, and/or one or more processors configured with software and/or firmware, e.g. stored in memory, that, when executed by the one or more processors may make the node(s) and device(s) to be configured to and/or to perform the above-described methods and actions.

Identification by any identifier herein may be implicit or explicit. The identification may be unique in a certain context, e.g. in the wireless communication network or at least in a relevant part or area thereof.

The term "network node" or simply “node” as used herein may as such refer to any type of node that may communicate with another node in and be comprised in a communication network, e.g. IP network or wireless communication network. Further, such node may be or be comprised in a radio network node (described below) or any network node, which e.g. may communicate with a radio network node. Examples of such network nodes include any radio network node, a core network node, Operations & Maintenance (O&M), Operations Support Systems (OSS), Self Organizing Network (SON) node, etc.

The term "radio network node" as may be used herein may as such refer to any type of network node for serving a wireless communication device, e.g. a so called User Equipment or UE, and/or that are connected to other network node(s) or network element(s) or any radio node from which a wireless communication device receives signals from. Examples of radio network nodes are Node B, Base Station (BS), MultiStandard Radio (MSR) node such as MSR BS, eNB, eNodeB, gNB, network controller, RNC, Base Station Controller (BSC), relay, donor node controlling relay, Base Transceiver Station (BTS), Access Point (AP), New Radio (NR) node, transmission point, transmission node, node in distributed antenna system (DAS) etc.

Each of the terms "wireless communication device", "user equipment" and "UE", as may be used herein, may as such refer to any type of wireless device arranged to communicate with a radio network node in a wireless, cellular and/or mobile communication system, and may thus be referred to as a wireless communication device. Examples include: target devices, device to device UE, device for Machine Type of Communication (MTC), machine type UE or UE capable of machine to machine (M2M) communication, Personal Digital Assistant (PDA), Tablet, mobile, terminals, smart phone, Laptop Embedded Equipment (LEE), Laptop Mounted Equipment (LME), Universal Serial Bus (USB) dongles etc.

While some terms are used frequently herein for convenience, or in the context of examples involving other a certain, e.g. 3GPP or other standard related, nomenclature, it must be appreciated that use of such term, without any further specifying information or context, is not limiting as such.

Also note that although terminology used herein may be particularly associated with and/or exemplified by certain communication systems or networks, this should as such not be seen as limiting the scope of the embodiments herein to only such certain systems or networks etc.

As used herein, the term "memory" may refer to a data memory for storing digital information, typically a hard disk, a magnetic storage, medium, a portable computer diskette or disc, flash memory, Random Access Memory (RAM) or the like. Furthermore, the memory may be an internal register memory of a processor.

Also note that any enumerating terminology such as first device or node, second device or node, first base station, second base station, etc., should as such be considered non-limiting and the terminology as such does not imply a certain hierarchical relation. Without any explicit information in the contrary, naming by enumeration should be considered merely a way of accomplishing different names.

As used herein, the expression "configured to" may mean that a processing circuit is configured to, or adapted to, by means of software or hardware configuration, perform one or more of the actions described herein.

As used herein, the terms "number" or "value" may refer to any kind of digit, such as binary, real, imaginary or rational number or the like. Moreover, "number" or "value" may be one or more characters, such as a letter or a string of letters. Also, "number" or "value" may be represented by a bit string.

As used herein, the expression “may” and "in some embodiments" has typically been used to indicate that the features described may be combined with any other embodiment disclosed herein.

In the drawings, features that may be present in only some embodiments are typically drawn using dotted or dashed lines.

As used herein, the expression "transmit" and "send" are typically interchangeable. These expressions may include transmission by broadcasting, uni-casting, group-casting and the like. In this context, a transmission by broadcasting may be received and decoded by any authorized device within range. In case of unicasting, one specifically addressed device may receive and encode the transmission. In case of group-casting, e.g. multicasting, a group of specifically addressed devices may receive and decode the transmission.

When using the word "comprise" or "comprising" it shall be interpreted as nonlimiting, i.e. meaning "consist at least of".

The embodiments herein are not limited to the above described embodiments. Various alternatives, modifications and equivalents may be used. Therefore, the above embodiments should not be taken as limiting the scope of the present disclosure, which is defined by the appending claims.