BACKGROUND OF DISCLOSURE

1. Field of the Disclosure

[0001] The present disclosure relates to the field of communication systems, and more particularly, to an apparatus and a method of wireless communication, which can provide a good communication performance and/or high reliability.

2. Description of the Related Art

[0002] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple- access systems include fourth generation (4G) systems such as long term evolution (LTE) systems, LTE-advanced (LTE-A) systems, or LTE-A pro systems, and fifth generation (5G) systems which may be referred to as new radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE).

[0003] In 3rd generation partnership project (3GPP) NR system, a network may configure a discontinuous reception (DRX) mechanism for a UE in order to avoid UE power consumption explosion. However, in future greenfield network, the network itself also needs to save power. Therefore, there is a need for an apparatus (such as a UE and/or a base station) and a method of wireless communication, which can reduce the network power consumption.

SUMMARY

[0004] An object of the present disclosure is to propose an apparatus (such as a user equipment (UE) and/or a base station) and a method of wireless communication, which can reduce a network power consumption, provide a good communication performance, and/or provide a high reliability.

[0005] In a first aspect of the present disclosure, a method of wireless communication by a UE includes performing, by the UE, one or more wake up signals (WUSs) and determining, by the UE, whether to monitor a downlink channel based on performing the one or more WUSs.

[0006] In a second aspect of the present disclosure, a method of wireless communication by a base station includes performing, by the base station, one or more wake up signals (WUSs) and controlling the UE to determine whether to monitor a downlink channel based on performing the one or more WUSs.

[0007] In some embodiments of any one of the above methods, the UE is configured to perform the one or more WUSs during a first period of a base station.

[0008] In some embodiments of any one of the above methods, the first period includes a discontinuous transmission (DTX) off period. [0009] In some embodiments of any one of the above methods, the downlink channel includes at least one of the followings: a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH). a synchronization signal block (SSB), a channel state information reference signal (CSI-RS) CSI-RS, or a second WUS. [0010] In some embodiments of any one of the above methods, determining, by the UE. whether to monitor the downlink channel based on performing the one or more WUSs includes determining, by the UE, whether to monitor the downlink channel in a next control resource set (CORESET) according to a search space set based on performing the one or more WUSs.

[0011] In some embodiments of any one of the above methods, the search space set includes a type0 common search space set, a type 0A common search space set, a type 1 common search space set, a type 2 common search space set, a type 3 common search space set, and/or a UE specific search space set.

[0012] In some embodiments of any one of the above methods, the method further includes the UE being configured with a discontinuous reception (DRX) mechanism by the base station, wherein the UE determines whether to monitor the downlink channel based on performing the one or more WUSs during a second period of the UE, and the second period is associated with the DRX mechanism.

[0013] In some embodiments of any one of the above methods, the UE obtains a DRX cycle and/or a DRX on duration through the DRX mechanism.

[0014] In some embodiments of any one of the above methods, in the first period, the UE assumes that the base station is in a power saving mode, a sleep mode, and/or an inactive mode, and/or the base station does not perform a downlink transmission and/or an uplink reception.

[0015] In some embodiments of any one of the above methods, performing, by the UE, the one or more WUSs during the first period further includes: wherein if the UE is configured with one or more first resources by the base station in the first period, the UE transmits a first wake up signal (WUS1) to the base station.

[0016] In some embodiments of any one of the above methods, the one or more first resources refer to one or more first WUS occasions.

[0017] In some embodiments of any one of the above methods, after the UE transmits the WUS 1 to the base station, the UE expects that the base station wakes up from the power saving mode, the sleep mode, and/or the inactive mode and enters to an active mode, where a downlink transmission and/or an uplink reception is resumed.

[0018] In some embodiments of any one of the above methods, after the UE transmits the WUS 1 to the base station, the UE starts to monitor the downlink channel.

[0019] In some embodiments of any one of the above methods, after the UE transmits the WUS 1 to the base station, the UE starts a timer or a window.

[0020] In some embodiments of any one of the above methods, if before the timer expires or the window ends, the UE does not detect the downlink channel and/or a downlink transmission from the base station, the UE retransmits the WUS1 in a next available resource of the WUS1.

[0021] In some embodiments of any one of the above methods, the next available resource refers to a next valid resource.

[0022] In some embodiments of any one of the above methods, performing, by the UE, the one or more WUSs during the first period further includes: wherein if the UE is configured with one or more second resources by the base station in the first period, the UE receives a second wake up signal (WUS2) from the base station. [0023] In some embodiments of any one of the above methods, the one or more second resources refer to one or more second WUS occasions.

[0024] In some embodiments of any one of the above methods, the UE is configured to receive the WUS2 from the base station.

[0025] In some embodiments of any one of the above methods, after the UE transmits the WUS 1 to the base station, the UE detects the WUS2 in a next available second resource.

[0026] In some embodiments of any one of the above methods, after the UE transmits the WUS 1 to the base station, if a next search space set is earlier than a next second resource, the UE monitors the downlink channel in the next search space set.

[0027] In some embodiments of any one of the above methods, after the UE transmits the WUS 1 to the base station, if a next search space set is later than a next second resource, the UE monitors the WUS2.

[0028] In some embodiments of any one of the above methods, when the WUS2 is detected by the UE, the UE starts to monitor the downlink channel.

[0029] In some embodiments of any one of the above methods, if the UE does not transmit the WUS 1 during the first period and if the UE is configured with the one or more second resources within the first period, the UE does not monitor the WUS2 in the one or more second resources.

[0030] In some embodiments of any one of the above methods, performing, by the UE, the one or more WUSs during the first period further includes: wherein if the UE is configured with one or more third resources by the base station in the first period, the UE receives a third wake up signal (WUS3) from the base station.

[0031] In some embodiments of any one of the above methods, the one or more third resources refer to one or more third WUS occasions, and/or the WUS3 is a cell-level signal, a broadcast signal, or a common signal to a group of UEs (group common signal).

[0032] In some embodiments of any one of the above methods, the UE is configured to receive the WUS3 from the base station.

[0033] In some embodiments of any one of the above methods, if the UE is configured to monitor the WUS3 during the first period and when the UE detects the WUS3, the UE assumes that the base station wakes up from a power saving mode, a sleep mode, and/or an inactive mode, and the UE starts to monitor the downlink channel.

[0034] In some embodiments of any one of the above methods, the UE assumes the base station to wake up from the power saving mode, the sleep mode, and/or the inactive mode within a time interval, where the interval includes a start location and a duration.

[0035] In some embodiments of any one of the above methods, the start location is relevant to the detected WUS3. [0036] In some embodiments of any one of the above methods, the duration is pre-configured and/or indicated in the detected WUS3 and/or pre-defined.

[0037] In some embodiments of any one of the above methods, the UE is configured with the one or more first resources for transmitting the WUS 1 to the base station, is configured to monitor the WUS2, and is configured to monitor the WUS3.

[0038] In some embodiments of any one of the above methods, after the UE transmits the WUS 1 to the base station, the UE monitors the WUS3, if the WUS3 is detected by the UE, the UE starts to monitor the WUS2 or monitor the WUS2 within the time duration, if the WUS2 is detected by the UE, the UE monitors the downlink channel or the UE monitors the downlink channel in within the time duration.

[0039] In some embodiments of any one of the above methods, after the UE transmits the WUS 1 to the base station, the UE monitors the WUS3, if the WUS3 is detected by the UE, the UE starts to monitor the WUS2 or monitor the WUS2 within the time duration, if the WUS2 is not detected by the UE, the UE does not monitor the downlink channel. [0040] In some embodiments of any one of the above methods, after the UE transmits the WUS 1 to the base station, the UE monitors the WUS3 and the WUS2, if the WUS3 is not detected by the UE and the WUS2 is detected by the UE, the UE monitors the downlink channel.

[0041] In some embodiments of any one of the above methods, if the UE does not transmit the WUS1 to the base station, the UE monitors the WUS3, if the WUS3 is detected by the UE, the UE starts to monitor the WUS2 or monitor the WUS2 within the time duration, if the WUS2 is detected by the UE, the UE monitors the downlink channel or UE monitors the downlink channel in within the time duration.

[0042] In a third aspect of the present disclosure, a user equipment includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to perform the above method.

[0043] In a fourth aspect of the present disclosure, a base station includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to perform the above method.

[0044] In a fifth aspect of the present disclosure, a wireless communication device includes an execution part configured to perform one or more wake up signals (WUSs) and a determiner configured to determine whether to monitor a downlink channel based on performing the one or more WUSs.

[0045] In a sixth aspect of the present disclosure, a wireless communication device includes an execution part configured to perform one or more wake up signals (WUSs) and a determiner configured to control the UE to determine whether to monitor a downlink channel based on performing the one or more WUSs.

[0046] In a seventh aspect of the present disclosure, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method.

[0047] In an eighth aspect of the present disclosure, a chip includes a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the above method. [0048] In a ninth aspect of the present disclosure, a computer readable storage medium, in which a computer program is stored, causes a computer to execute the above method.

[0049] In a tenth aspect of the present disclosure, a computer program product includes a computer program, and the computer program causes a computer to execute the above method.

[0050] In an eleventh aspect of the present disclosure, a computer program causes a computer to execute the above method.

BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to illustrate the embodiments of the present disclosure or related art more clearly, the following figures will be described in the embodiments are briefly introduced. It is obvious that the drawings are merely some embodiments of the present disclosure, a person having ordinary skill in this field can obtain other figures according to these figures without paying the premise. [0052] FIG. 1 is a block diagram of one or more user equipments (UEs) and a base station (e.g., gNB) of communication in a communication network system (e.g., non-terrestrial network (NTN) or a terrestrial network) according to an embodiment of the present disclosure.

[0053] FIG. 2 is a flowchart illustrating a method of wireless communication performed by a user equipment (UE) according to an embodiment of the present disclosure.

[0054] FIG. 3 is a flowchart illustrating a method of wireless communication performed by a base station according to an embodiment of the present disclosure.

[0055] FIG. 4 is a schematic diagram illustrating an example that a network may configure a DRX mechanism for UE according to an embodiment of the present disclosure.

[0056] FIG. 5 is a schematic diagram illustrating an example a wireless communication between abase station and a UE according to another embodiment of the present disclosure.

[0057] FIG. 6 is a block diagram of a wireless communication device according to an embodiment of the present disclosure.

[0058] FIG. 7 is a block diagram of a wireless communication device according to an embodiment of the present disclosure.

[0059] FIG. 8 is a flowchart illustrating a method of wireless communication performed by a wireless communication device according to an embodiment of the present disclosure.

[0060] FIG. 9 is a flowchart illustrating a method of wireless communication performed by a wireless communication device according to an embodiment of the present disclosure.

[0061] FIG. 10 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

[0062] Embodiments of the present disclosure are described in detail with the technical matters, structural features, achieved objects, and effects with reference to the accompanying drawings as follows. Specifically, the terminologies in the embodiments of the present disclosure are merely for describing the purpose of the certain embodiment, but not to limit the disclosure.

[0063] In 3GPP NR system, a network may configure discontinuous reception (DRX) mechanism for a UE in order to avoid UE power consumption explosion. On the other hand, when the network configures period transmissions for the UE, such as tracking reference signal (TRS), it does not know the clear UE behavior of whether would receive these TRS within the DRX off period, so that the network cannot skip transmitting the TRS during the DRX off period. Thus, in case the UE does not receive the TRS, the transmission may be wasting, leading to a waste of network power energy consumption. This may increase the network operational cost, adding cost pressure for 5G system. In some embodiments of this disclosure, some methods are proposed to remove this issue. Some embodiments of the present disclosure present a method for the network to effectively save power while still maintain the possibility for scheduling traffic to the UE.

[0064] FIG. 1 illustrates that, in some embodiments, one or more user equipments (UEs) 10 and abase station (e.g., gNB) 20 for transmission adjustment in a communication network system 30 (e.g., non-terrestrial network (NTN) or terrestrial network) according to an embodiment of the present disclosure are provided. The communication network system 30 includes the one or more UEs 10 and the base station 20. The one or more UEs 10 may include a memory 12. a transceiver 13, and a processor 1 1 coupled to the memory 12 and the transceiver 13. The base station 20 may include a memory 22, a transceiver 23. and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement proposed functions, procedures and/or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled with the processor 11 or 21. and the transceiver 13 or 23 transmits and/or receives a radio signal.

[0065] The processor 11 or 21 may include application-specific integrated circuit (ASIC), other chipset, logic circuit and/or data processing device. The memory 12 or 22 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and/or other storage device. The transceiver 13 or 23 may include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21 in which case those can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.

[0066] In some embodiments, the processor 11 is configured to: perform one or more wake up signals (WUSs) and determine whether to monitor a downlink channel based on performing the one or more WUSs. This can reduce a network power consumption, provide a good communication performance, and/or provide a high reliability.

[0067] In some embodiments, the processor 21 is configured to: perform one or more wake up signals (WUSs) and control the UE 10 to determine whether to monitor a downlink channel based on performing the one or more WUSs. This can reduce a network power consumption, provide a good communication performance, and/or provide a high reliability.

[0068] FIG. 2 illustrates a method 200 of wireless communication by a UE according to an embodiment of the present disclosure. In some embodiments, the method 200 includes: a block 202, performing, by the UE, one or more wake up signals (WUSs). and a block 204, determining, by the UE, whether to monitor a downlink channel based on performing the one or more WUSs. This can reduce a network power consumption, provide a good communication performance, and/or provide a high reliability.

[0069] FIG. 3 illustrates a method 300 of wireless communication by a base station according to an embodiment of the present disclosure. In some embodiments, the method 300 includes: a block 302, performing, by the base station, one or more wake up signals (WUSs) during a first period of the base station, and a block 304, controlling the UE to determine whether to monitor a downlink channel based on performing the one or more WUSs. This can reduce a network power consumption, provide a good communication performance, and/or provide a high reliability.

[0070] The examples given in this disclosure can be applied for internet of dungs (loT) device or narrowband- internet of things (NB-IoT) UE in non-terrestrial network (NTN) systems, but the method is not exclusively restricted to NTN system nor for loT devices or NB-IoT UE. The examples given in this disclosure can be applied for NR systems, LTE systems, or NB-IoT systems. Further, some examples in the present disclosure can be applied for NB- loT system, physical downlink control channel (PDCCH) is equivalent to NB-PDCCH (NPDCCH) and physical downlink shared channel (PDSCH) is equivalent to NB-PDSCH (NPDSCH).

[0071] Example: [0072] FIG. 4 is a schematic diagram illustrating an example that a network may configure a DRX mechanism for UE according to an embodiment of the present disclosure. FIG. 4 illustrates that, in some embodiments, a network may configure a DRX mechanism for a UE, where a legacy DRX mechanism as described in TS38.321. For example, the MAC entity may be configured by RRC with a DRX functionality that controls the UE's PDCCH monitoring activity for the MAC entity's C-RNTI, CI-RNTI, CS-RNTI, INT-RNTI, SH-RNTI, SP-CSI-RNTI, TPC-PUCCH- RNTI, TPC-PUSCH-RNTI, TPC-SRS-RNTI, AI-RNTI. SL-RNTI, SLCS-RNTI and SL Semi-Persistent Scheduling V-RNTI. For example, when a UE is configured with DRX. the UE may obtain a DRX cycle, which is periodic and a DRX cycle location as illustrated in FIG.4, a parameter Offset is used to determine the DRX duration starting location. The DRX duration is controlled by a timer, when the DRX duration starts, the UE restarts the timer and when the timer expires the DRX duration ends. On the other hand, when a UE detects a PDCCH within the DRX duration, the UE starts another timer (drx-inactivityTimer), and the DRX duration ends when both the timer and the drx- inactivityTimer end.

[0073] In some examples, the DRX cycle is periodic. In some examples, the UE is configured to determine starting location of the DRX on duration using a parameter. In some examples, the parameter comprises an offset. In some examples, the DRX on duration is controlled by a first timer. In some examples, when the DRX on duration starts, the UE starts or restarts the first timer, and when the first timer expires, the DRX on duration ends. In some examples, when the UE detects the downlink channel within the DRX on duration, the UE starts a second timer. In some examples, the second timer comprises a drx-inactivityTimer. In some examples, the DRX on duration ends when both the first timer and the second timer end.

[0074] FIG. 5 is a schematic diagram illustrating an example a wireless communication between abase station and a UE according to another embodiment of the present disclosure. FIG. 5 illustrates that, in some embodiments, in the period of discontinuous transmission (DTX) off, where a network such as a base station may enter a power saving mode. The UE assumes that the base station may not perform downlink transmissions and/or uplink receptions. However, the base station may configure one or more resources for UE to send a first wake up signal (WUS 1 ) to the network. These one or more resources may also be called the first WUS occasions. After a UE sending the WUS1 to the network, the UE may assume that the network may wake up from the power saving mode and may enter to an active mode, where DL and/or UL is resumed.

[0075] In some examples, the UE is configured with one or more resources of the first WUS, the UE may transmit a WUS1 in a resource of the first WUS. After transmitting the WUS1, the UE may start to monitor PDCCH in the next CORESET according to a search space set, where the search space set comprises type0 and/or type 0A and/or type 1 and/or type 2 and/or type 3 common search space set and/or UE specific search space set. In some examples, after the UE sends the WUS1, the UE may start a timer or a window, if before the timer expires or the window ends the UE does not detect a PDCCH and/or a downlink transmission from the base station, the UE may send again the WUS1 in the next available resource of the first WUS. In some examples, the available resource may also refer to valid resource.

[0076] In some examples, the UE is configured with one or more second WUS resources, and the UE may receive a second WUS (WUS2) from the network. After the UE sends the WUS1, the UE may detect the WUS2 in the next available second WUS resource, once a WUS2 is detected by the UE, the UE starts to monitor PDCCH in the next CORESET according to a search space set, where the search space set comprise type0 and/or type 0A and/or type 1 and/or type 2 and/or type 3 common search space set and/or UE specific search space set. In some examples, after the UE sends the WUS 1 , if a next search space set is earlier than the next second WUS resource, the UE monitors PDCCH in the next search space set. In some examples, after the UE sends the WUS1, if a next search space set is later than the next second WUS resource, the UE monitors WUS2, once it is detected, the UE starts to monitor PDCCH.

[0077] In some examples, if a UE does not send WUS 1 during the gNB DTX off period, and if the UE is configured with one or more resources of the second WUS within the DTX off period, the UE does not monitor the WUS2 in the one or more resources of the second WUS. The advantage is that since the UE does not send WUS1 which does not trigger the network to wake up thus, the UE may assume/expect that the network is still in sleep mode, therefore the UE does not monitor WUS2 to save the UE power consumption.

[0078] In some examples, if a UE is configured to monitor a third WUS (WUS3) and in some examples, the UE is configured to monitor the WUS3 during the gNB DTX off period and when the UE detects the WUS3, the UE may assume that the gNB wakes up from a sleep mode and the UE will start to monitor PDCCH.

[0079] In some examples, a UE is configured with one or more resources for transmitting WUS1, and is configured to monitor WUS2 and is configured to monitor WUS3. If the UE sends WUS1, after sending the WUS1, the UE monitors WUS3 and if the WUS3 is detected, UE then starts to monitor WUS2, if the WUS2 is detected, the UE may monitor PDCCH in the next CORESET according to a search space set, where the search space set comprise type0 and/or type 0A and/or type 1 and/or type 2 and/or type 3 common search space sett and/or UE specific search space set.

[0080] If the UE sends WUS 1, after sending the WUS 1 , the UE monitors WUS3 and if the WUS3 is detected, UE then starts to monitor WUS2, if the WUS2 is not detected in the corresponding WUS2 resource, the UE may not monitor PDCCH in the next CORESET according to a search space set, where the search space set includes type0 and/or type 0A and/or type 1 and/or type 2 and/or type 3 common search space sett and/or UE specific search space set.

[0081] If the UE sends WUS1. after sending the WUS1, the UE monitors WUS3 and the WUS2, if the WUS3 is not detected, but WUS2 is detected, the UE may monitor PDCCH in the next CORESET according to a search space set, where the search space set includes type0 and/or type 0A and/or type 1 and/or type 2 and/or type 3 common search space sett and/or UE specific search space set.

[0082] If the UE does not send WUS1, the UE monitors WUS3, if the WUS3 is detected, UE then starts to monitor WUS2, if the WUS2 is detected, the UE may monitor PDCCH in the next CORESET according to a search space set, where the search space set includes type0 and/or type OA and/or type 1 and/or type 2 and/or type 3 common search space sett and/or UE specific search space set.

[0083] FIG. 6 illustrates a wireless communication device 1500 according to an embodiment of the present disclosure. The wireless communication device 1500 includes an execution part 1501 configured to perform one or more wake up signals (WUSs); and a determiner 1502 configured to determine whether to monitor a downlink channel based on performing the one or more WUSs. This can reduce a network power consumption, provide a good communication performance, and/or provide a high reliability.

[0084] FIG.7 illustrates a wireless communication device 1600 according to an embodiment of the present disclosure. The wireless communication device 1600 includes an execution part 1601configured to perform one or more wake up signals (WUSs); and a determiner 1602 configured to control the UE to determine whether to monitor a downlink channel based on performing the one or more WUSs. This can reduce a network power consumption, provide a good communication performance, and/or provide a high reliability. [0085] FIG. 8 illustrates a method 1700 of wireless communication by a wireless communication device according to an embodiment of the present disclosure. In some embodiments, the method 1700 includes: a block 1702, performing, by a wireless communication device, one or more wake up signals (WUSs); and/or a block 1704, controlling the UE to determine whether to monitor a downlink channel based on performing the one or more WUSs. This can reduce a network power consumption, provide a good communication performance, and/or provide a high reliability. The wireless communication device may be a UE.

[0086] FIG. 9 illustrates a method 1800 of wireless communication by a wireless communication device according to an embodiment of the present disclosure. In some embodiments, the method 1800 includes: a block 1802, performing, by a wireless communication device, one or more wakeup signals (WUSs); and a block 1804, determining, by the wireless communication device, whether to monitor a downlink channel based on performing the one or more WUSs. This can reduce a network power consumption, provide a good communication performance, and/or provide a high reliability. The wireless communication device may be a base station.

[0087] In some embodiments, the UE is configured to perform the one or more WUSs during a first period of a base station. In some embodiments, the first period includes a discontinuous transmission (DTX) off period. In some embodiments, the downlink channel includes at least one of the followings: a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a synchronization signal block (SSB), a channel state information reference signal (CSI-RS) CSI-RS, or a second WUS. In some embodiments, determining, by the UE, whether to monitor the downlink channel based on performing the one or more WUSs includes determining, by the UE, whether to monitor the downlink channel in a next control resource set (CORESET) according to a search space set based on performing the one or more WUSs.

[0088] In some embodiments, the search space set includes a type0 common search space set, a type 0A common search space set, a type 1 common search space set, a type 2 common search space set, a type 3 common search space set, and/or a UE specific search space set. In some embodiments, the method further includes the UE being configured with a discontinuous reception (DRX) mechanism by the base station, wherein the UE determines whether to monitor the downlink channel based on performing the one or more WUSs during a second period of the UE, and the second period is associated with the DRX mechanism. In some embodiments, the UE obtains a DRX cycle and/or a DRX on duration through the DRX mechanism. In some embodiments, in the first period, the UE assumes that the base station is in a power saving mode, a sleep mode, and/or an inactive mode, and/or the base station does not perf orm a downlink transmission and/or an uplink reception.

[0089] Optionally, in some examples, the DRX cycle is periodic. Optionally, in some examples, the UE is configured to determine starting location of the DRX on duration using a parameter. Optionally, in some examples, the parameter comprises an offset. Optionally, in some examples, the DRX on duration is controlled by a first timer. Optionally, in some examples, when the DRX on duration starts, the UE starts or restarts the first timer, and when the first timer expires, the DRX on duration aids. Optionally, in some examples, when the UE detects the downlink channel within the DRX on duration, the UE starts a second timer. Optionally, in some examples, the second timer comprises a drx-inactivityTimer. Optionally, in some examples, the DRX on duration ends when both the first timer and the second timer end.

[0090] In some embodiments, performing, by the UE, the one or more WUSs during the first period further includes: wherein if the UE is configured with one or more first resources by the base station in the first period, the UE transmits a first wake up signal (WUS1) to the base station. In some embodiments, the one or more first resources refer to one or more first WUS occasions. In some embodiments, after the UE transmits the WUS1 to the base station, the UE expects that the base station wakes up from the power saving mode, the sleep mode, and/or the inactive mode and enters to an active mode, where a downlink transmission and/or an uplink reception is resumed. In some embodiments, after the UE transmits the WUS1 to the base station, the UE starts to monitor the downlink channel.

[0091] In some embodiments, after the UE transmits the WUS1 to the base station, the UE starts a timer or a window. In some embodiments, if before the timer expires or the window ends, the UE does not detect the downlink channel and/or a downlink transmission from the base station, the UE retransmits the WUS1 in a next available resource of the WUS1. In some embodiments, the next available resource refers to a next valid resource. In some embodiments, performing, by the UE, the one or more WUSs during the first period further includes: wherein if the UE is configured with one or more second resources by the base station in the first period, the UE receives a second wake up signal (WUS2) from the base station. In some embodiments, the one or more second resources refer to one or more second WUS occasions.

[0092] In some embodiments, the UE is configured to receive the WUS2 from the base station. In some embodiments, after the UE transmits the WUS1 to the base station, the UE detects the WUS2 in a next available second resource. In some embodiments, after the UE transmits the WUS1 to the base station, if a next search space set is earlier than a next second resource, the UE monitors the downlink channel in the next search space set. In some embodiments, after the UE transmits the WUS 1 to the base station, if a next search space set is later than a next second resource, the UE monitors the WUS2. In some embodiments, when the WUS2 is detected by the UE, the UE starts to monitor the downlink channel. In some embodiments, if the UE does not transmit the WUS 1 during the first period and if the UE is configured with the one or more second resources within the first period, the UE does not monitor the WUS2 in the one or more second resources.

[0093] In some embodiments, performing, by the UE, the one or more WUSs during the first period further includes: wherein if the UE is configured with one or more third resources by the base station in the first period, the UE receives a third wake up signal (WUS3) from the base station. In some embodiments, the one or more third resources refer to one or more third WUS occasions, and/or the WUS3 is a cell-level signal, a broadcast signal, or a common signal to a group of UEs (group common signal). In some embodiments, the UE is configured to receive the WUS3 from the base station. In some embodiments, if the UE is configured to monitor the WUS3 during the first period and when the UE detects the WUS3, the UE assumes that the base station wakes up from a power saving mode, a sleep mode, and/or an inactive mode, and the UE starts to monitor the downlink channel.

[0094] In some embodiments, the UE assumes the base station to wake up from the power saving mode, the sleep mode, and/or the inactive mode within a time interval, where the interval includes a start location and a duration. In some embodiments, the start location is relevant to the detected WUS3. In some embodiments, the duration is pre- configured and/or indicated in the detected WUS3 and/or pre-defined. In some embodiments, the UE is configured with the one or more first resources for transmitting the WUS 1 to the base station, is configured to monitor the WUS2, and is configured to monitor the WUS3. In some embodiments, after the UE transmits the WUS1 to the base station, the UE monitors the WUS3, if the WUS3 is detected by the UE, the UE starts to monitor the WUS2 or monitor the WUS2 within the time duration, if the WUS2 is detected by the UE, the UE monitors the downlink channel or the UE monitors the downlink channel in within the time duration.

[0095] In some embodiments, after the UE transmits the WUS1 to the base station, the UE monitors the WUS3, if the WUS3 is detected by the UE, the UE starts to monitor the WUS2 or monitor the WUS2 within the time duration, if the WUS2 is not detected by the UE, the UE does not monitor the downlink channel. In some embodiments, after the UE transmits the WUS 1 to the base station, the UE monitors the WUS3 and the WUS2, if the WUS3 is not detected by the UE and the WUS2 is detected by the UE, the UE monitors the downlink channel. In some embodiments, if the UE does not transmit the WUS1 to the base station, the UE monitors the WUS3, if the WUS3 is detected by the UE. the UE starts to monitor the WUS2 or monitor the WUS2 within the time duration, if the WUS2 is detected by the UE, the UE monitors the downlink channel or UE monitors the downlink channel in within the time duration.

[0096] Commercial interests for some embodiments are as follows. 1. Reducing a network power consumption. 2. Providing a good communication performance. 3. Providing a high reliability. 4. Some embodiments of the present disclosure are used by 5G-NR chipset vendors, V2X communication system development vendors, automakers including cars, trains, trucks, buses, bicycles, moto-bikes. helmets, and etc., drones (unmanned aerial vehicles), smartphone makers, communication devices for public safety use, AR/VR device maker for example gaming, conference/seminar, education purposes. Some embodiments of the present disclosure are a combination of “techniques/processes” that can be adopted in 3GPP specification to create an end product. Some embodiments of the present disclosure could be adopted in 5G NR licensed and non-licensed or shared spectrum communications. Some embodiments of the present disclosure propose technical mechanisms.

[0097] FIG. 10 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and/or software. FIG. 10 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, an application circuitry 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (I/O) interface 780, coupled with each other at least as illustrated. The application circuitry 730 may include a circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include any combination of general-purpose processors and dedicated processors, such as graphics processors, application processors. The processors may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems running on the system.

[0098] The baseband circuitry 720 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include a baseband processor. The baseband circuitry may handle various radio control functions that enables communication with one or more radio networks via the RF circuitry. The radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc. In some embodiments, the baseband circuitry may provide for communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry may support communication with an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN), a wireless local area network (WLAN), a wireless personal area network (WPAN). Embodiments in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.

[0099] In various embodiments, the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency. For example, in some embodiments, baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency. The RF circuitry 710 may arable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network. In various embodiments, the RF circuitry 710 may include circuitry to operate with signals that are not strictly considered as being in a radio frequency. For example, in some embodiments, RF circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.

[0100] In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be embodied in whole or in part in one or more of the RF circuitry, the baseband circuitry, and/or the application circuitry. As used herein, “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or a memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality. In some embodiments, the electronic device circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules. In some embodiments, some or all of the constituent components of the baseband circuitry, the application circuitry, and/or the memory/storage may be implemented together on a system on a chip (SOC). The memory/storage 740 may be used to load and store data and/or instructions, for example, for system. The memory/storage for one embodiment may include any combination of suitable volatile memory, such as dynamic random access memory (DRAM)), and/or non-volatile memory, such as flash memory.

[0101] In various embodiments, the I/O interface 780 may include one or more user interfaces designed to enable user interaction with the system and/or peripheral component interfaces designed to enable peripheral component interaction with the system. Use ¹ interfaces may include, but are not limited to a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc. Peripheral component interfaces may include, but are not limited to, a non- volatile memory port, a universal serial bus (USB) port, an audio jack, and a power supply interface. In various embodiments, the sensor 770 may include one or more sensing devices to determine environmental conditions and/or location information related to the system. In some embodiments, the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit. The positioning unit may also be part of, or interact with, the baseband circuitry and/or RF circuitry to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite.

[0102] In various embodiments, the display 750 may include a display, such as a liquid crystal display and a touch screen display. In various embodiments, the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, an AR/VR glasses, etc. In various embodiments, system may have more or less components, and/or different architectures. Where appropriate, methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.

[0103] A person having ordinary skill in the art understands that each of the units, algorithm, and steps described and disclosed in the embodiments of the present disclosure are realized using electronic hardware or combinations of software for computers and electronic hardware. Whether the functions run in hardware or software depends on the condition of application and design requirement for a technical plan. A person having ordinary skill in the art can use different ways to realize the function for each specific application while such realizations should not go beyond the scope of the present disclosure. It is understood by a person having ordinary skill in the art that he/she can refer to the working processes of the system, device, and unit in the above-mentioned embodiment since the working processes of the above-mentioned system, device, and unit are basically the same. For easy description and simplicity, these working processes will not be detailed.

[0104] It is understood that the disclosed system, device, and method in the embodiments of the present disclosure can be realized with other ways. The above-mentioned embodiments are exemplary only. The division of the units is merely based on logical functions while other divisions exist in realization. It is possible that a plurality of units or components are combined or integrated in another system. It is also possible that some characteristics are omitted or skipped. On the other hand, the displayed or discussed mutual coupling, direct coupling, or communicative coupling operate through some ports, devices, or units whether indirectly or communicatively by ways of electrical, mechanical, or other kinds of forms.

[0105] The units as separating components for explanation are or are not physically separated. The units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments. Moreover, each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.

[0106] If the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product. Or, one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product. The software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure. The storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a floppy disk, or other kinds of media capable of storing program codes.

[0107] While the present disclosure has been described in connection with what is considered the most practical and preferred embodiments, it is understood that the present disclosure is not limited to the disclosed embodiments but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.