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Title:
USER EQUIPMENT AND METHOD OF COMMUNICATION
Document Type and Number:
WIPO Patent Application WO/2021/176325
Kind Code:
A1
Abstract:
A user equipment and a method of communication of the same are provided. The method includes providing, to a UE, a first information; the first information is used to determine a second information.

Inventors:
LIN HAO (FR)
Application Number:
PCT/IB2021/051678
Publication Date:
September 10, 2021
Filing Date:
March 01, 2021
Export Citation:
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Assignee:
OROPE FRANCE SARL (FR)
International Classes:
H04L1/18
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Claims:
CLAIMS

1. A method of communication of a user equipment (UE), comprising: Receiving a first information; the first information is used to determine a second information.

Description:
USER EQUIPMENT AND METHOD OF COMMUNICATION

BACKGROUND

1. Field of the Disclosure

The present disclosure relates to the field of communication systems, and more particularly, to a user equipment (UE) and a method of communication, which can provide a good communication performance and high reliability.

2. Description of the Related Art

In an unlicensed band, an unlicensed spectrum is a shared spectrum. Communication equipments in different communication systems can use the unlicensed spectrum as long as the unlicensed meets regulatory requirements set by countries or regions on a spectrum. There is no need to apply for a proprietary spectrum authorization from a government.

In order to allow various communication systems that use the unlicensed spectrum for wireless communication to coexist friendly in the spectrum, some countries or regions specify regulatory requirements that must be met to use the unlicensed spectrum. For example, a communication device follows a listen before talk (LBT) procedure, that is, the communication device needs to perform a channel sensing before transmitting a signal on a channel. When an LBT outcome illustrates that the channel is idle, the communication device can perform signal transmission; otherwise, the communication device cannot perform signal transmission. In order to ensure fairness, once a communication device successfully occupies the channel, a transmission duration cannot exceed a maximum channel occupancy time (MCOT).

In new radio-based access to unlicensed spectrum (NRU), when a user equipment (UE) intends to transmit uplink transmission, it should first perform LBT, also called a channel access procedure. However, how to indicate an LBT outcome is still an open issue.

In addition, in an NRU wideband operation, a BS (such as gNB) and a UE can operate in a wider band including resource block (RB) sets. New radio (NR) release 15 has defined a BWP concept, thus in a context of the NRU wideband operation, the UE can be configured with an active BWP including multiple RB sets. However, by regulation, priori to each transmission in the spectrum, a sender needs to perform the LBT procedure. This implies that for transmissions of multiple RB sets, multi-RB set-based LBT has to be performed. Because an outcome of the multi-RB-set based LBT cannot be ensured, the UE or the BS cannot predict the outcome of the LBT procedure.

Therefore, there is a need for a UE and a method of communication of the same, which can solve issues in the prior art and provide a method for a physical layer in the UE to indicate to higher layers in the UE about a channel access outcome (such as a listen before talk (LBT) outcome).

SUMMARY

An object of the present disclosure is to propose a user equipment (UE) and a method of communication, which can solve issues in the prior art and provide a method determining an information based on the other information.

BRIEF DESCRIPTION OF DRAWINGS

In order to describe the technical solutions in the present disclosure more clearly, the drawings required to be used in the embodiments will be simply introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. Those skilled in the art may further obtain other drawings according to the drawings without creative work.

FIG. 1 is a diagram illustrating a user equipment and a base station of communication in a communication network system according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

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.

In some embodiments, in new radio-based access to unlicensed spectrum (NRU), when a user equipment (UE) intends to transmit uplink transmission, it should first perform LBT, also called a channel access procedure. It is also very helpful for a higher layer in the UE to know how often in a physical layer in the UE the channel is sensed to be not idle after performing the channel access procedure (i.e. LBT failure) and how often the channel is sensed to be idle after performing the channel access procedure (i.e. LBT success). Some embodiments provide a method for a physical layer in a user equipment UE to indicate to higher layers in the UE about a channel access outcome (such as a listen before talk (LBT) outcome).

FIG. 1 illustrates that, in some embodiments, a user equipment (UE) 10 and a base station (BS) (e.g., gNB) 20 of communication in a communication network system 30 according to an embodiment of the present disclosure are provided. The communication network system 30 includes one or more UEs 10 of a cell and the BS 20. The UE 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12, the transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22, 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.

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 or 22 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.

In embodiment 1, if UE has previously transmitted HARQ-ACK information of a TB (TB1) for the given HARQ process number (HARQ1) before a first PUCCH transmission occasion and the UE has not been scheduled by any DCI for reception of another PDSCH corresponding to TB1 for HARQ1, since the latest PUCCH transmission before the first PUCCH transmission occasion, in this case the UE will report HARQ-ACK=NACK for the TB 1 for HARQ1 in the first PUCCH transmission.

In embodiment 2, if UE has received a PDSCH transmission corresponding to TB 1 for HARQ1 and the UE has completed the decoding of this PDSCH, i.e. the UE has obtained the HARQ-ACK information after decoding the PDSCH. Moreover, if this HARQ-ACK information has not been transmitted before a first PUCCH transmission occasion, then the UE will report this HARQ-ACK information for the TB1 of the given HARQ process number (HARQl)in the first PUCCH transmission

In embodiment 3, if UE has previously transmitted HARQ-ACK information of a TB (TB 1) for the given HARQ process number (HARQ1) before a first PUCCH and the UE has been scheduled by another DCI for reception of another PDSCH corresponding to TB 1 for the same HARQ process number, i.e. HARQ1, since the latest PUCCH transmission before the first PUCCH transmission occasion, in this case the UE will simply report the previously transmitted HARQ-ACK information of a TB (TB1) for the given HARQ process number (HARQ1) in the first PUCCH transmission.

In embodiment 4, if UE has previously transmitted HARQ-ACK information of a TB (TB 1) for the given HARQ process number (HARQ1) before a first PUCCH transmission occasion and the UE has been scheduled by another DCI for reception of another PDSCH (new PDSCH) corresponding to TB 1 for the same HARQ process number, i.e. HARQ1, since the latest PUCCH transmission but before the first PUCCH transmission occasion, in this case the UE will simply report the previously transmitted HARQ-ACK information of the TB (TB1) for the given HARQ process number (HARQ1) under the condition that the decoding of the new PDSCH has not been completed before the first PUCCH transmission occasion.

In embodiment 5, if UE has previously transmitted HARQ-ACK information of a TB (TB 1) for the given HARQ process number (HARQ1) before the first PUCCH transmission occasion and the UE has been scheduled by another DCI for reception of another PDSCH (new PDSCH) corresponding to TB 1 for the same HARQ process number, i.e. HARQ1, since the latest PUCCH transmission before the first PUCCH transmission occasion, in this case the UE will report the HARQ-ACK information of the new PDSCH corresponding to the TB (TB 1) for the given HARQ process number (HARQ1) in the first PUCCH transmission, under the condition that the decoding of the new PDSCH has been completed before the first PUCCH transmission occasion.

In embodiment 6, if UE has previously transmitted HARQ-ACK information of a TB (TB 1) for the given HARQ process number (HARQ1) before a first PUCCH transmission occasion and the UE has been scheduled by another DCI for reception of another PDSCH (new PDSCH) corresponding to TB 1 for the same HARQ process number, i.e. HARQ1, since the latest PUCCH transmission but before the first PUCCH transmission occasion, in this case the UE does not expect that the decoding of the new PDSCH cannot be completed before the first PUCCH transmission occasion.

In embodiment 7, according to embodiment 6, if the unexpected case happens, the UE can report whatever HARQ-ACK information corresponding to a given TB (TB 1) for a given HARQ process number (HARQ1) in the first PUCCH transmission. The HARQ-ACK information is not defined.

In embodiment 8, if UE has previously transmitted HARQ-ACK information of a TB (TB 1) for the given HARQ process number (HARQ1) before a first PUCCH transmission occasion and the UE has been scheduled by another DCI for reception of another PDSCH (new PDSCH) corresponding to TB 1 for the same HARQ process number, i.e. HARQ1, since the latest PUCCH transmission but before the first PUCCH transmission occasion, in this case if the decoding of the new PDSCH cannot be completed before the first PUCCH transmission occasion, the UE will report HARQ-ACK=NACK for the TB1 for HARQ1 in the first PUCCH transmission.

In embodiment 9, if UE has previously transmitted HARQ-ACK information of a TB (TB 1) for the given HARQ process number (HARQ1) before the first PUCCH transmission occasion and the UE has been scheduled by another DCI for reception of another PDSCH (new PDSCH) corresponding to TB 1 for the same HARQ process number, i.e. HARQ1, since the latest PUCCH transmission before the first PUCCH transmission occasion. Moreover, if there is not sufficient time to complete the new PDSCH decoding before the first PUCCH transmission occasion, in this case if the UE further determines new PDSCH transmission is a retransmission, the UE will report the previously transmitted HARQ-ACK information of the PDSCH, based on which the UE determines the new PDSCH is a retransmission, corresponding to the TB (TB1) for the given HARQ process number (HARQ1) in the first PUCCH transmission.

In embodiment 10, if UE has previously transmitted HARQ-ACK information of a TB (TB 1) for the given HARQ process number (HARQ1) before the first PUCCH transmission occasion and the UE has been scheduled by another DCI for reception of another PDSCH (new PDSCH) corresponding to TB1 for the same HARQ process number, i.e. HARQ1, since the latest PUCCH transmission before the first PUCCH transmission occasion. Moreover, if there is not sufficient time to complete the new PDSCH decoding before the first PUCCH transmission occasion, in this case if the UE further determines new PDSCH transmission is a retransmission, the UE will report HARQ-ACK=ACK, if the previously transmitted HARQ-ACK information of the PDSCH, based on which the UE determines the new PDSCH is a retransmission, is ACK corresponding to the TB (TB1) for the given HARQ process number (HARQ1), based on which the UE determines the new PDSCH is a retransmission, in the first PUCCH transmission.

In embodiment 11, according to embodiments 1-10, the first PUCCH transmission is allocated for one-shot HARQ-ACK transmission. The one-shot HARQ-ACK transmission comprises type-3 HARQ-ACK codebook. The HARQ-ACK information reported in the first PUCCH transmission is included in type-3 HARQ-ACK codebook.

In embodiment 12, further based on embodiments 4-10, a PDSCH decoding is not completed before the first PUCCH transmission occasion. It means that the time duration between the last symbol of the received PDSCH and the first symbol of the first PUCCH is smaller than a pre-defined value. On the other hand, a PDSCH decoding is completed before the first PUCCH transmission occasion. It means that the time duration between the last symbol of the received PDSCH and the first symbol of the first PUCCH equal or greater than a pre-defined value. This pre-defined value is used to indicate the minimum time needed for processing PDSCH decoding and prepare the corresponding HARQ-ACK information.

In embodiment 13, further based on embodiment 12, the pre-defined value is the PDSCH processing time LI defined in TS 38.214 subclause 5.3. 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.