WO2021159850A1

WO2021159850A1 - Wireless communication methods, user equipment and network device

Info

Publication number: WO2021159850A1
Application number: PCT/CN2020/136548
Authority: WO
Inventors: Li Guo
Original assignee: Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority date: 2020-02-11
Filing date: 2020-12-15
Publication date: 2021-08-19

Abstract

The present disclosure provides a wireless communication method applied in a User Equipment (UE). The method includes: obtaining a first Hybrid Automatic Repeat Request (HARQ) -Acknowledge (ACK) codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells; obtaining a third HARQ-ACK codebook based on the first HARQ-ACK codebook and the second HARQ-ACK codebook; and transmitting the third HARQ-ACK codebook in an uplink transmission.

Description

WIRELESS COMMUNICATION METHODS, USER EQUIPMENT AND NETWORK DEVICE

TECHNICAL FIELD

The present disclosure relates to communication technology, and more particularly, to wireless communication methods and the associated User Equipment (UE) and network device.

BACKGROUND

An NR/5G system has introduced multi-Transmission/reception point (TRP) based non-coherent joint transmission. Multiple TRPs are connected through a backhaul link for coordination. The backhaul link can be ideal or non-ideal. In the case of an ideal backhaul, the TRPs can exchange dynamic Physical Downlink Shared Channel (PDSCH) scheduling information with a short latency and thus the different TRPs can coordinate the PDSCH transmission per PDSCH transmission. In a non-ideal backhaul case, the information exchange between TRPs has a large latency and thus coordination between TRPs can only be semi-static or static.

In non-coherent joint transmission, different TRPs use different Physical Downlink Control Channels (PDCCHs) to schedule the PDSCH transmission independently. Each TRP can send one Downlink control information (DCI) to schedule one PDSCH transmission. PDSCHs from different TRPs can be scheduled in same or different slots. Two different PDSCH transmissions from different TRPs can be fully overlapped or partially overlapped in PDSCH resource allocation. To support multi-TRP based non-coherent joint transmission, a User Equipment (UE) is requested to receive PDCCH from multiple TRPs and then receive PDSCH sent from multiple TRPs. For each PDSCH transmission, the UE can feedback Hybrid Automatic Repeat Request (HARQ) -Acknowledge (ACK) information to the network. In multi-TRP transmission, the UE can feedback the HARQ-ACK information for each PDSCH transmission to the TRP transmitting the PDSCH. The UE can also feedback the HARQ-ACK information for a PDSCH transmission sent from any TRP to one particular TRP.

In the current specification, in the method for generating a HARQ-ACK codebook for multi-TRP transmission, the UE only generates HARQ-ACK bits for possible PDSCH transmission for one TRP in an active Bandwidth Part (BWP) of one serving cell. The multi-TRP transmission is not actually considered in the procedure of generating HARQ-ACK bits. The consequence is that the HARQ-ACK bits for PDSCHs transmitted from multiple TRPs are not generated properly and thus the HARQ-ACK feedback information to the system is not correct. The transmission quality of the multi-TRP system would be greatly impaired and the data rate and throughput would be degraded greatly.

SUMMARY

The present disclosure provides wireless communication methods and associated User Equipment (UE) and network device, capable of solving or mitigating one or more of the above problems.

According to a first aspect of the present disclosure, a wireless communication method applied in a UE is provided. The method includes: obtaining a first Hybrid Automatic Repeat Request (HARQ) -Acknowledge (ACK) codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells; obtaining a third HARQ-ACK codebook based on the first HARQ-ACK codebook and the second HARQ-ACK codebook; and transmitting the third HARQ-ACK codebook in an uplink transmission.

According to a second aspect of the present disclosure, a wireless communication method applied in a network device is provided. The method includes receiving a third HARQ-ACK codebook in an uplink transmission. The third HARQ-ACK codebook is based on a first HARQ-ACK codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells.

According to a third aspect of the present disclosure, a UE is provided. The UE includes: a processing unit configured to: obtain a first HARQ-ACK codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells; and obtain a third HARQ-ACK codebook based on the first HARQ-ACK codebook and the second HARQ-ACK codebook; and a communication unit configured to transmit the third HARQ-ACK codebook in an uplink transmission.

According to a fourth aspect of the present disclosure, a network device is provided. The network device includes a communication unit configured to receive a third HARQ-ACK codebook in an uplink transmission. The third HARQ-ACK codebook is based on a first HARQ-ACK codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells.

According to a fifth aspect of the present disclosure, a UE is provided. The UE includes a memory having computer program stored thereon; and a processor configured to invoke and run the computer program whereby the UE is operative to perform the method according to the above first aspect.

According to a sixth aspect of the present disclosure, a chip is provided. The chip includes a processor configured to invoke and run a computer program from a memory whereby an apparatus provided with the chip is operative to perform the method according to the above first aspect.

According to a seventh aspect of the present disclosure, a computer readable storage medium is provided. The computer readable storage medium has a computer program stored thereon, and the computer program, when executed by a computer, causes the computer to perform the method according to the above first aspect.

According to an eighth aspect of the present disclosure, a computer program product is provided. The computer program product includes computer program instructions, and the computer program instructions, when executed by a computer, cause the computer to perform the method according to the above first aspect.

According to a ninth aspect of the present disclosure, a computer program is provided. The computer program, when executed by a computer, causes the computer to perform the method according to the above first aspect.

According to a tenth aspect of the present disclosure, a network device is provided. The network device includes: a memory having computer program stored thereon; and a processor configured to invoke and run the computer program whereby the network device is operative to perform the method according to the above second aspect.

According to an eleventh aspect of the present disclosure, a chip is provided. The chip includes a processor configured to invoke and run a computer program from a memory whereby an apparatus provided with the chip is operative to perform the method according to the above second aspect.

According to a twelfth aspect of the present disclosure, a computer readable storage medium is provided. The computer readable storage medium has a computer program stored thereon, and the computer program, when executed by a computer, causes the computer to perform the method according to the above second aspect.

According to a thirteenth aspect of the present disclosure, a computer program product is provided. The computer program product includes computer program instructions, and the computer program instructions, when executed by a computer, cause the computer to perform the method according to the above second aspect.

According to a fourteenth aspect of the present disclosure, a computer program is provided. The computer program, when executed by a computer, causes the computer to perform the method according to the above second aspect.

With the embodiments of the present disclosure, the UE can correctly generate a HARQ-ACK codebook for multi-TRP transmission by considering the multi-TRP transmission in the procedure of generating HARQ-ACK bits. This can lead to the correct HARQ-ACK feedback information, thereby improving the transmission quality of the multi-TRP system while improving the data rate and throughput.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages will be more apparent from the following description of embodiments with reference to the figures, in which:

Fig. 1a illustrates an example of multi-Transmission/reception point (TRP) based non-coherent joint transmission;

Fig. 1b illustrates another example of multi-TRP transmission based non-coherent joint transmission;

Fig. 2 is a flowchart illustrating a wireless communication method 200 applied in a User Equipment (UE) according to embodiments of the present disclosure;

Fig. 3 illustrates an exemplary implementation of block 220;

Fig. 4 is a flowchart illustrating a wireless communication method 400 applied in a network device according to embodiments of the present disclosure;

Fig. 5 is a block diagram of a UE 500 according to embodiments of the present disclosure;

Fig. 6 is a block diagram of a network device 600 according to embodiments of the present disclosure;

Fig. 7 is a block diagram of a communication device 700 according to embodiments of the present disclosure;

Fig. 8 is a block diagram of an apparatus 800 according to embodiments of the present disclosure; and

Fig. 9 is a block diagram of a communication system 900 according to embodiments of the present disclosure.

DETAILED DESCRIPTION

Hereinafter, the present disclosure will be described with reference to embodiments shown in the attached drawings. However, it is to be understood that those descriptions are just provided for illustrative purpose, rather than limiting the present disclosure. Further, in the following, descriptions of known structures and techniques are omitted so as not to unnecessarily obscure the concept of the present disclosure.

As used herein, the term "wireless communication network" refers to a network following any suitable communication standards, such as NR, LTE-Advanced (LTE-A) , LTE, Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , and so on. Furthermore, the communications between a terminal device such as a User Equipment (UE) and a network device in the wireless communication network may be performed according to any suitable generation communication protocols, including, but not limited to, Global System for Mobile Communications (GSM) , Universal Mobile Telecommunications System (UMTS) , Long Term Evolution (LTE) , and/or other suitable 1G (the first generation) , 2G (the second generation) , 2.5G, 2.75G, 3G (the third generation) , 4G (the fourth generation) , 4.5G, 5G (the fifth generation) communication protocols, wireless local area network (WLAN) standards, such as the IEEE 802.11 standards; and/or any other appropriate wireless communication standard, such as the Worldwide Interoperability for Microwave Access (WiMax) , Bluetooth, and/or ZigBee standards, and/or any other protocols either currently known or to be developed in the future.

The term "network device" refers to a device in a wireless communication network via which a UE accesses the network and receives services therefrom. The network device refers to a base station (BS) , an access point (AP) , or any other suitable device in the wireless communication network. The BS may be, for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , or a (next) generation (gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth. Yet further examples of the network device may include multi-standard radio (MSR) radio equipment such as MSR BSs, network controllers such as radio network controllers (RNCs) or base station controllers (BSCs) , base transceiver stations (BTSs) , transmission points, transmission nodes. More generally, however, the network device may represent any suitable device (or group of devices) capable, configured, arranged, and/or operable to enable and/or provide a UE access to the wireless communication network or to provide some service to a UE that has accessed the wireless communication network.

The term "UE" refers to any end device that can access a wireless communication network and receive services therefrom. By way of example and not limitation, the UE may be, for example, a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) . The UE may include, but not limited to, portable computers, desktop computers, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, tablets, personal digital assistants (PDAs) , wearable terminal devices, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) and the like. As used herein, a "UE" may not necessarily have a "user" in the sense of a human user who owns and/or operates the relevant device. Instead, a UE may represent a device that is intended for sale to, or operation by, a human user but that may not initially be associated with a specific human user.

As used herein, a downlink (DL) transmission refers to a transmission from a network device to a UE, and an uplink (UL) transmission refers to a transmission in an opposite direction.

References in the specification to "one embodiment, " "an embodiment, " "an example embodiment, " and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It shall be understood that although the terms "first" and "second" etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed terms.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be liming of example embodiments. As used herein, the singular forms "a" , "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" , "comprising" , "has" , "having" , "includes" and/or "including" , when used herein, specify the presence of stated features, elements, and/or components etc., but do not preclude the presence or addition of one or more other features, elements, components and/or combinations thereof.

In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.

Fig. 1a illustrates an example of multi-Transmission/reception point (TRP) based non-coherent joint transmission, in which a UE receives Physical Downlink Shared Channel (PDSCH) based on non-coherent joint transmission from two TRPs: TRP1 and TRP2. As shown in Fig. 1a, TRP1 sends one Downlink control information (DCI) to schedule transmission of PDSCH1 to the UE and TRP2 sends one DCI to schedule transmission of PDSCH 2 to the UE. At the UE side, the UE receives and decodes the DCIs from both TRPs. Based on the DCI from TRP1, the UE receives and decodes PDSCH1, and based on the DCI from TRP2, the UE receives and decodes PDSCH2. In the example shown in Fig. 1a, the UE reports Hybrid Automatic Repeat Request (HARQ) -Acknowledge (ACK) for PDSCH1 and PDSCH2 to the TRP1 and TRP2, respectively. TRP1 and TRP2 use different Control Resource Sets (CORESETs) and search spaces to transmit DCI scheduling PDSCH transmission to the UE. So, a Network (NW) can configure multiple CORESETs and search spaces. Each TRP can be associated with one or more CORESETs and also the related search spaces. With such configuration, the TRPs would use the associated CORESET to transmit DCI to schedule a PDSCH transmission to the UE. The UE can be requested to decode DCI in CORESETs associated with either TRP to obtain PDSCH scheduling information.

Fig. 1b illustrates another example of multi-TRP transmission based non-coherent joint transmission, in which a UE receives PDSCH based on non-coherent joint transmission from two TRPs: TRP1 and TRP2. As shown in Fig. 1b, TRP1 sends one DCI to schedule transmission of PDSCH1 to the UE and TRP2 sends one DCI to schedule transmission of PDSCH2 to the UE. At the UE side, the UE receives and decodes the DCIs from both TRPs. Based on the DCI from TRP1, the UE receives and decodes PDSCH1 and based on the DCI from TRP2, the UE receive and decodes PDSCH2. In the example shown in Fig. 1b, the UE reports HARQ-ACK for both PDSCH1 and PDSCH2 to the TRP1, which is different from the HARQ-ACK reporting in the example shown in Fig. 1a. The example shown in Fig. 1b needs an ideal backhaul between TRP1 and TRP2, while the example shown in Fig. 1a can be deployed in scenarios where a backhaul between TRP1 and TRP2 is ideal or non-ideal.

It should be noted that the present disclosure is not limited to the multi-TRP transmission involving two TRPs as illustrated in Figs. 1a and 1b. Rather, the present disclosure is also applicable to multi-TRP transmission involving more than two TRPs.

In an NR/5G system, a higher layer parameter CORESETPoolIndex is used to differentiate whether multi-TRP transmission is supported in one serving cell or not. In one serving cell, if multi-TRP transmission is supported, CORESETs in that serving cell would be configured with one of two different values for the higher layer parameter CORESETPoolIndex. Specifically, in one Bandwidth Part (BWP) of the serving cell, if the UE is provided with a higher layer parameter CORESETPoolIndex with a value of 0 or not provided with the higher layer parameter for some CORESET (s) and is provided with a higher layer parameter CORESETPoolIndex with a value of 1 for other CORESET (s) , then multi-TRP transmission is supported for that UE in the BWP of the serving cell.

In one active BWP of a serving cell, the UE can be configured with one of the following HARQ-ACK feedback modes: joint HARQ-ACK feedback and separate HARQ-ACK feedback. In the joint HARQ-ACK feedback, HARQ-ACK bits for PDSCHs from all the TRPs are multiplexed in one same HARQ codebook and then the UE reports that HARQ-ACK codebook in one Physical Uplink Control Channe (PUCCH) or Physical Uplink Shared Channel (PUSCH) to the network side. In contrast, in the separate HARQ-ACK feedback, the UE generates a HARQ-ACK codebook for the PDSCHs of each TRP separately and then reports each HARQ-ACK codebook separately in different PUCCH transmissions or PUSCH transmissions. In the separate HARQ-ACK transmission, the UE would assume PUCCHs carrying HARQ-ACK bits for different TRPs are not overlapped in time domain.

In the current specification, for multi-DCI based multi-TRP transmission, the UE can generate HARQ-ACK bits for all the possible PDSCH transmissions for each TRP in an active BWP of one serving cell, i.e., for each set of CORESETs associated with a value of 0 or 1 of the higher layer parameter CORESETPoolIndex. But in the method for generating a HARQ-ACK codebook for multi-TRP transmission specified in the current specification, the UE only generates HARQ-ACK bits for possible PDSCH transmission for one TRP in an active BWP of one serving cell. The multi-TRP transmission is not actually considered in the procedure of generating HARQ-ACK bits. The consequence is that the HARQ-ACK bits for PDSCHs transmitted from two or more TRPs are not generated properly and thus the HARQ-ACK feedback information to the system is not correct. The transmission quality of the multi-TRP system would be greatly impaired and the data rate and throughput would be degraded greatly.

In view of this, the present disclosure proposes to consider multi-TRP transmission in generating HARQ-ACK bits.

According to some embodiments of the present disclosure, a UE can monitor a set of PDCCH candidates in one or more CORESETs on the active DL BWP on each activated serving cell configured with PDCCH monitoring according to corresponding search space sets. The UE monitors PDCCH candidates to decode each PDCCH candidate according to the monitored DCI formats. In each DL BWP, the UE can be configured with one or more CORESETs. For each CORESET, the UE is provided with a few parameters to specify the time-frequency resource, DMRS configuration, antenna port quasi co-location and association with TRPs. For each CORESET, the UE can be provided with a higher layer parameter CORESETPoolIndex, which takes value from 0 or 1. The CORESETs associated with the same value of higher layer parameter CORESETPoolIndex are associated with one same TRP in multi-TRP transmission. In other words, if the UE is provided with CORESETPoolIndex having a same value for each CORESET on the active DL BWP of a serving cell, it can be determined that multi-TRP transmission is not configured for the serving cell.

According to the present disclosure, there are several examples in which the UE determines whether multi-TRP transmission is configured in one BWP of a serving cell or not.

As a first example, if none of the CORESET (s) in one DL BWP on one serving cell is provided with the higher layer parameter CORESETPoolIndex, then multi-TRP transmission is not configured.

As a second example, if some of the CORESETs in one DL BWP on one serving cell is provided with the higher layer parameter CORESETPoolIndex and the value of CORESETPoolIndex is set to be 1, and the rest of CORESETs in the DL BWP are not provided with the higher layer parameter CORESETPoolIndex, then multi-TRP transmission is configured in the DL BWP. In this example, the UE can assume that the CORESET (s) not provided with the higher layer parameter CORESETPoolIndex is associated with the higher layer parameter CORESETPoolIndex with value = 0.

As a third example, if some of the CORESETs in one DL BWP on one serving cell is provided with the higher layer parameter CORESETPoolIndex and the value of CORESETPoolIndex is set to be 1 and some of CORESETs in the DL BWP are provided with the higher layer parameter CORESETPoolIndex with value = 0, then multi-TRP transmission is configured in the DL BWP. In this example, the UE can assume all the CORESET (s) not provided with the higher layer parameter CORESETPoolIndex is associated with the higher layer parameter CORESETPoolIndex with value = 0.

As a fourth example, if each of the CORESETs in one DL BWP on one serving cell is provided with the higher layer parameter CORESETPoolIndex having a same value of 1 or 0, then multi-TRP transmission is not configured.

In some embodiments, the present disclosure proposes a method for generating a HARQ-ACK codebook when multi-TRP transmission is configured. To be specific, the UE generates a first set of serving cells that includes at least one CORESET not provided with higher layer parameter CORESETPoolIndex or provided with a higher layer parameter CORESETPoolIndex with a value of 0, and generates a second set of serving cells that includes at least one CORESET provided with higher layer parameter CORESETPoolIndex with a value of 1. The UE generates a third set of serving cell by appending the second set of serving cells to the first set of serving cells. Then, the UE generates a HARQ-ACK codebook for the third set of serving cells, and reports the HARQ-ACK codebook to a network device such as a gNB.

For example, the UE may determine that one of its serving cells belongs to the first set of serving cells, if the serving cell includes a first CORESET and the UE is not provided with CORESETPoolIndex or is provided with CORESETPoolIndex with a value of 0 for the first CORESET on an active DL BWP of the serving cell. Similarly, the UE may determine that one of its serving cells belongs to the second set of serving cells, if the serving cell includes a second CORESET and the UE is provided with CORESETPoolIndex with a value of 1 for the second CORESET on an active DL BWP of the other serving cell.

According to the present disclosure, the first set of serving cells may include one or more serving cells, and the second set of serving cells may include one or more serving cells. A serving cell in the first set of serving cells may only include the first CORESET or may include both the first CORESET and the second CORESET. Similarly, a serving cell in the second set of serving cells may only include the second CORESET or may include both the first CORESET and the second CORESET. That is, a serving cell in the first set of serving cells may be the same as or different from the one or more serving cells in the second set of serving cells. For example, it is possible that the UE may have a serving cell, which includes both the first CORESET and the second CORESET. In this case, such serving cell may belong to both the first set of serving cells and the second set of serving cells. That is, there may be some overlapping between the first set of serving cells and the second set of serving cells. In other words, if the first set of serving cells includes one or more first serving cells, and the second set of serving cells includes one or more second serving cells, it is possible that one first serving cell and one second serving cell refer to the same serving cell, which includes both the first CORESET and the second CORESET. Of course, it is also possible that the first serving cell only includes the first CORESET and the second serving cell only includes the second CORESET, that is, the first serving cell and the second serving cell refer to different serving cells.

In this example, if a UE

- is not provided CORESETPoolIndex or is provided CORESETPoolIndex with a value of 0 for first CORESETs on active DL BWPs of serving cells, and

- is provided CORESETPoolIndex with a value of 1 for second CORESETs on active DL BWPs of the serving cells, and

- is provided ACKNACKFeedbackMode = JointFeedback

where

- a serving cell is placed in a first set S ₀ of

serving cells if the serving cell includes a first CORESET, and

- a serving cell is placed in a second set S ₁ of

serving cells if the serving cell includes a second CORESET, and

- serving cells are placed in a set according to an ascending order of a serving cell index,

then the UE generates a set S of serving cells (i.e., the third set of serving cells) by concatenating the first set S ₀ and the second set S ₁, i.e., S= {S ₀, S ₁} of

serving cells. In one example, the UE generates the set S of

serving cells by appending the second set S ₁ to the first set S ₀. Then, the UE generates a Type-1 HARQ-ACK codebook for the set S. In other word, the UE generates a Type-1 HARQ-ACK codebook for the set S= {S ₀, S ₁} of

serving cells.

As an example, the UE may generate the Type-1 HARQ-ACK codebook for the set S according to pseudo code as presented in the following Table 1. To be specific, a UE determines

HARQ-ACK information bits, for a total number of O _ACK HARQ-ACK information bits, of a HARQ-ACK codebook for transmission in a PUCCH according to the following pseudo-code as listed in Table 1. In the following pseudo-code, if the UE does not receive a transport block or a Code Block Group (CBG) , due to the UE not detecting a corresponding DCI format 1_0 or DCI format 1_1, the UE generates a NACK value for the transport block or the CBG. The cardinality of the set M _A, c defines a total number M _c of occasions for PDSCH reception or Semi-Persistent Scheduling (SPS) PDSCH release for serving cell _c corresponding to the HARQ-ACK information bits.

Table 1: Pseudo-code for generating HARQ-ACK bits

According to the pseudo-code in Table 1 as described above, the UE may generate O _ACK HARQ-ACK bits for the serving cells in the set S.

It should be appreciated that the present disclosure is not limited to the pseudo-code for the HARQ-ACK codebook generation as listed in Table 1. Rather, other appropriate pseudo-code showing an appropriate process or scheme for HARQ-ACK codebook generation is also applicable to the present disclosure.

In some embodiments, the present disclosure proposes another method for generating a HARQ-ACK codebook when multi-TRP transmission is configured. To be specific, the UE generates a first set of serving cells that includes at least one CORESET not provided with higher layer parameter CORESETPoolIndex or provided with higher layer parameter CORESETPoolIndex with a value of 0, and generates a second set of serving cells that includes at least one CORESET provided with higher layer parameter CORESETPoolIndex with a value of 1. For the first set of serving cells, the UE generates a first HARQ-ACK codebook and for the second set of serving cells, the UE generates a second HARQ-ACK codebook. The UE generates a third HARQ-ACK codebook by appending the second HARQ-ACK codebook to the first HARQ-ACK codebook. Then, the UE reports the third HARQ-ACK codebook in PUCCH and/or PUSCH to a network device such as a gNB.

Fig. 2 is a flowchart illustrating a wireless communication method 200 according to embodiments of the present disclosure. The wireless communication method 200 can be performed at a UE.

At block 210, the UE obtains a first HARQ-ACK codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells.

In an embodiment, each serving cell in the first set of serving cells includes a first CORESET, and each serving cell in the second set of serving cells includes a second CORESET.

In an embodiment, the first CORESET is provided with a higher layer parameter having a first value, and the second CORESET is provided with the higher layer parameter having a second value. The first value is different from the second value. For example, the first value is 0, and/or the second value is 1.

In an embodiment, the first CORESET is not provided with a higher layer parameter, and the second CORESET is provided with the higher layer parameter having a second value. For example, the second value is 1.

In an embodiment, the higher layer parameter is CORESETPoolIndex.

In an embodiment, each of the first HARQ-ACK codebook and the second HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.

In an embodiment, the third HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.

For example, the UE may determine that one of its serving cells belongs to the first set of serving cells, if the serving cell includes the first CORESET and the UE is not provided with CORESETPoolIndex or is provided with CORESETPoolIndex with a value of 0 for the first CORESET on an active DL BWP of the serving cell. Similarly, the UE may determine that one of its serving cells belongs to the second set of serving cells, if the serving cell includes the second CORESET and the UE is provided with CORESETPoolIndex with a value of 1 for the second CORESET on an active DL BWP of the other serving cell.

In this example, if a UE

- is provided ACKNACKFeedbackMode = JointFeedback

where

- a serving cell is placed in a first set S ₀ of

serving cells if the serving cell includes a first CORESET, and

- a serving cell is placed in a second set S ₁ of

serving cells if the serving cell includes a second CORESET, and

then the UE may generate the first or second HARQ-ACK codebook according to pseudo code as presented in the following Table 2.

To be specific, the UE determines

HARQ-ACK information bits, for a total number of O _ACK HARQ-ACK information bits, of a HARQ-ACK codebook for transmission in a PUCCH according to the following pseudo-code as presented in Table 2. In the following pseudo-code, if the UE does not receive a transport block or a CBG, due to the UE not detecting a corresponding DCI format 1_0 or DCI format 1_1, the UE generates a NACK value for the transport block or the CBG. The cardinality of the set M _A, c defines a total number M _c of occasions for PDSCH reception or SPS PDSCH release for serving cell _c corresponding to the HARQ-ACK information bits.

Table 2: Pseudo code for generating HARQ-ACK bits

According to Table 2 as described above, the UE may generate

HARQ-ACK bits for the serving cells in the first set S ₀, and generate

HARQ-ACK bits for the serving cells in the second set S ₁.

It should be appreciated that the present disclosure is not limited to the pseudo-code for the HARQ-ACK codebook generation as listed in Table 2. Rather, other appropriate pseudo-code showing an appropriate process or scheme for HARQ-ACK codebook generation is also applicable to block 210 of the present disclosure.

It should be noted that the pseudo-code as listed in Table 2 is similar with that in Table 1, and the only difference lies in that the pseudo-code as listed in Table 2 is adapted to generate HARQ-ACK information bits for the first set S ₀ or the second set S ₁, while the pseudo-code as listed in Table 1 is adapted to generate HARQ-ACK information bits for the set S (i.e., the third set obtained by concatenating the second set S ₁ to the first set S ₀) .

At block 220, the UE obtains a third HARQ-ACK codebook based on the first HARQ-ACK codebook and the second HARQ-ACK codebook.

Fig. 3 illustrates an exemplary implementation of block 220. At block 310, the UE generates the third HARQ-ACK codebook by concatenating the first HARQ-ACK codebook and the second HARQ-ACK codebook. For example, the UE may concatenate the HARQ-ACK codebook for the first set S ₀ and the HARQ-ACK codebook for the second set S ₁ by appending the

HARQ-ACK bits to the

HARQ-ACK bits, to generate a HARQ-ACK codebook with a total number of O _ACK HARQ-ACK information bits, as the third HARQ-ACK codebook.

At block 230, the UE transmits the third HARQ-ACK codebook in an uplink transmission. For each PDSCH transmission, the UE may feedback HARQ-ACK information in the third HARQ-ACK codebook to a network device such as a gNB.

In an embodiment, the uplink transmission includes a PUCCH and/or a PUSCH. In other words, the UE may transmit the third HARQ-ACK codebook in a PUCCH and/or a PUSCH, so as to feed back HARQ-ACK information to the network device.

With the method 200 according to the embodiments of the present disclosure, the UE can correctly generate a HARQ-ACK codebook for multi-TRP transmission by considering the multi-TRP transmission in the procedure of generating HARQ-ACK bits. This can lead to the correct HARQ-ACK feedback information, thereby improving the transmission quality of the multi-TRP system while improving the data rate and throughput.

Fig. 4 is a flowchart illustrating a wireless communication method 400 according to embodiments of the present disclosure. The wireless communication method 400 can be performed at a network device.

At block 410, the network device receives a third HARQ-ACK codebook in an uplink transmission. The third HARQ-ACK codebook is based on a first HARQ-ACK codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells. For example, each of the first HARQ-ACK codebook and the second HARQ-ACK codebook may be obtained by the UE, e.g., according to the pseudo-code in Table 2.

In an embodiment, the third HARQ-ACK codebook is based on a concatenation of the first HARQ-ACK codebook and the second HARQ-ACK codebook. For example, the third HARQ-ACK codebook may be generated by concatenating the first HARQ-ACK codebook and the second HARQ-ACK codebook, e.g., at the UE side.

In an embodiment, the higher layer parameter is CORESETPoolIndex.

In an embodiment, the third HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.

In an embodiment, the uplink transmission includes a PUCCH and/or a PUSCH. In other words, the network device may receive the third HARQ-ACK codebook in a PUCCH and/or a PUSCH, so as to get HARQ-ACK information from the UE.

With the method 400 according to the embodiments of the present disclosure, the network device may receive a HARQ-ACK codebook for multi-TRP transmission, which is correctly generated by considering the multi-TRP transmission in the procedure of generating HARQ-ACK bits.

Correspondingly to the wireless communication method 200 as described above, a UE is provided. Fig. 5 is a block diagram of a UE 500 according to an embodiment of the present disclosure.

As shown in Fig. 5, the UE 500 includes a processing unit 510 and a communication unit 520.

The processing unit 510 is configured to obtain a first HARQ-ACK codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells, and to obtain a third HARQ-ACK codebook on the first HARQ-ACK codebook and the second HARQ-ACK codebook.

The communication unit 520 is configured to transmit the third HARQ-ACK codebook in an uplink transmission. For example, the uplink transmission may include a PUCCH and/or a PUSCH. In other words, the UE may transmit the third HARQ-ACK codebook in a PUCCH and/or a PUSCH, so as to feed back HARQ-ACK information to the network device.

In an embodiment, the processing unit 510 is further configured to obtain the third HARQ-ACK codebook by: generating the third HARQ-ACK codebook by concatenating the first HARQ-ACK codebook and the second HARQ-ACK codebook.

In an embodiment, the first CORESET is provided with a higher layer parameter having a first value, and the second CORESET is provided with the higher layer parameter having a second value, the first value being different from the second value. For example, the first value is 0, and/or the second value is 1.

In an embodiment, the higher layer parameter is CORESETPoolIndex.

In an embodiment, the third HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.

In some embodiments, the processing unit 510 can include one or more processors, and the communication unit 520 can be a communication interface, a transceiver, a communication chip or an input-output interface of a System-on-Chip (SOC) .

It should be understood that the UE 500 according to the embodiment of the present disclosure may correspond to the UE in the wireless communication method 200 according to the embodiments of the present disclosure, and the above and other operations and/or functions of each unit in the UE 500 are to implement the method shown in Fig. 2, respectively. For the sake of brevity, the corresponding process of the UE in Fig. 2 will not be repeated here.

Correspondingly to the wireless communication method 400 as described above, a network device is provided. Fig. 6 is a block diagram of a network device 600 according to an embodiment of the present disclosure.

As shown in Fig. 6, the network device 600 includes a communication unit 610.

The communication unit 610 is configured to receive a third HARQ-ACK codebook in an uplink transmission. The third HARQ-ACK codebook is based on a first HARQ-ACK codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells.

In an embodiment, the third HARQ-ACK codebook is based on a concatenation of the first HARQ-ACK codebook and the second HARQ-ACK codebook.

In an embodiment, the higher layer parameter is CORESETPoolIndex.

In an embodiment, the third HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.

In an embodiment, the uplink transmission includes a PUCCH and/or a PUSCH.

In some embodiments, the communication unit 610 can be a communication interface, a transceiver, a communication chip or an input-output interface of a SOC.

It should be understood that the network device 600 according to the embodiment of the present disclosure may correspond to the network device in the wireless communication method 400 according to the embodiments of the present disclosure, and the above and other operations and/or functions of each unit in the network device 600 are to implement the method shown in Fig. 4, respectively. For the sake of brevity, the corresponding process of the network device in Fig. 4 will not be repeated here.

Fig. 7 is a block diagram of a communication device 700 according to embodiments of the present disclosure. The communication device 700 shown in Fig. 7 includes a processor 710, and the processor 710 can invoke and run a computer program from a memory to implement the

wireless communication method

200 or 400 according to the embodiments of the present disclosure.

In an embodiment, as shown in Fig. 7, the communication device 700 may further include a memory 720. The processor 710 may invoke and run a computer program from the memory 720 to implement the

wireless communication method

200 or 400 according to the embodiments of the present disclosure.

The memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.

In an embodiment, as shown in Fig. 7, the communication device 700 may further include a transceiver 730, and the processor 710 may control the transceiver 730 to communicate with other devices, e.g., transmitting information or data to other devices, or receiving information or data from other devices.

The transceiver 730 may include a transmitter and a receiver. The transceiver 730 may further include one or more antennas.

In an embodiment, the communication device 700 may be a UE according to the embodiments of the present disclosure, and the communication device 700 may implement the corresponding process implemented by the UE in the method 200 according to the embodiments of the present disclosure.

In an embodiment, the communication device 700 may be a network device according to the embodiments of the present disclosure, and the communication device 700 may implement the corresponding process implemented by the network device in the method 400 according to the embodiments of the present disclosure.

Fig. 8 is a block diagram of an apparatus 800 according to embodiments of the present disclosure. The apparatus 800 includes a processor 810, which is configured to invoke and run a computer program from a memory to implement the

wireless communication method

200 or 400 according to the embodiments of the present disclosure.

In an embodiment, as shown in Fig. 8, the apparatus 800 may further include a memory 820. The processor 810 may invoke and run a computer program from the memory 820 to implement the

wireless communication method

200 or 400 according to the embodiments of the present disclosure.

The memory 820 may be a separate device independent of the processor 810, or may be integrated in the processor 810.

In an embodiment, the apparatus 800 may further include an input interface 830. The processor 810 may control the input interface 830 to communicate with other devices or chips, e.g., obtaining information or data sent by other devices or chips.

In an embodiment, the apparatus 800 may further include an output interface 840. The processor 810 can control the output interface 840 to communicate with other devices or chips, e.g., outputting information or data to other devices or chips.

In an embodiment, the apparatus 800 can be applied to the UE or the network device according to the embodiments of the present disclosure, and the apparatus can implement the corresponding processes implemented by the UE or the network device in each method according to the embodiments of the present disclosure.

In an embodiment, the apparatus 800 can also be a chip. For example, the apparatus 800 can be a system-level chip or a system-on-chip.

Fig. 9 is a block diagram of a communication system 900 according to embodiments of the present disclosure. As shown in Fig. 9, the communication system 900 includes a UE 910 and a network device 920.

The UE 910 can be used to implement the corresponding function implemented by the UE in the above method 200, and the network device 920 can be used to implement the corresponding function implemented by the network device in the above method 400. For example, the UE 910 may generate a HARQ-ACK codebook by considering multi-TRP transmission in the procedure of generating HARQ-ACK bits, and then transmit the HARQ-ACK codebook to the network device 920. Correspondingly, the network device 920 may receive the HARQ-ACK codebook generated in this way from the UE 910.

It should be understood that the processor according to the embodiments of the present disclosure may be a single CPU (Central Processing Unit) , but could also include two or more processing units. For example, the processor may include general purpose microprocessors; instruction set processors and/or related chips sets and/or special purpose microprocessors such as Application Specific Integrated Circuits (ASICs) . The processor may also include board memory for caching purposes. The computer program may be carried by a computer program product connected to the processor. The computer program product may include a non-transitory computer readable storage medium on which the computer program is stored. For example, the computer program product may be a flash memory, a Random-Access Memory (RAM) , a Read-Only Memory (ROM) , or an EEPROM, and the computer program modules described above could in alternative embodiments be distributed on different computer program products in the form of memories.

The embodiments of the present disclosure also provide a computer readable storage medium having a computer program stored thereon.

In an embodiment, the computer readable storage medium can be applied to the UE or the network device according to the embodiments of the present disclosure, and the computer program causes a computer to execute the corresponding process implemented by the UE or the network device in each method according to the embodiments of the present disclosure.

The embodiments of the present disclosure also provide a computer program product including computer program instructions.

In an embodiment, the computer program product can be applied to the UE or the network device according to the embodiments of the present disclosure, and the computer program instructions cause the computer to perform the corresponding process implemented by the UE or the network device in each method according to the embodiments of the present disclosure.

The embodiment of the present disclosure also provides a computer program.

In an embodiment, the computer program can be applied to the UE or the network device according to the embodiments of the present disclosure. When executed by the computer, the computer program causes the computer to perform the corresponding process implemented by the UE or the network device in each method according to the embodiments of the present disclosure.

The disclosure has been described above with reference to embodiments thereof. It should be understood that various modifications, alternations and additions can be made by those skilled in the art without departing from the spirits and scope of the disclosure. Therefore, the scope of the disclosure is not limited to the above particular embodiments but only defined by the claims as attached.

Claims

A wireless communication method applied in a User Equipment (UE) , comprising:

obtaining a first Hybrid Automatic Repeat Request (HARQ) -Acknowledge (ACK) codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells;

obtaining a third HARQ-ACK codebook based on the first HARQ-ACK codebook and the second HARQ-ACK codebook; and

transmitting the third HARQ-ACK codebook in an uplink transmission.
The wireless communication method according to claim 1, wherein said obtaining the third HARQ-ACK codebook comprises:

generating the third HARQ-ACK codebook by concatenating the first HARQ-ACK codebook and the second HARQ-ACK codebook.
The wireless communication method according to claim 1 or 2, wherein each serving cell in the first set of serving cells comprises a first Control Resource Set (CORESET) , and each serving cell in the second set of serving cells comprises a second CORESET.
The wireless communication method according to claim 3, wherein the first CORESET is provided with a higher layer parameter having a first value, and the second CORESET is provided with the higher layer parameter having a second value, the first value being different from the second value.
The wireless communication method according to claim 4, wherein the first value is 0.
The wireless communication method according to claim 3, wherein the first CORESET is not provided with a higher layer parameter, and the second CORESET is provided with the higher layer parameter having a second value.
The wireless communication method according to any of claims 4-6, wherein the second value is 1.
The wireless communication method according to any of claims 4-7, wherein the higher layer parameter is CORESETPoolIndex.
The wireless communication method according to any of claims 1-8, wherein each of the first HARQ-ACK codebook and the second HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.
The wireless communication method according to any of claims 1-9, wherein the third HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.
The wireless communication method according to any of claims 1-10, wherein the uplink transmission comprises a Physical Uplink Control Channel (PUCCH) and/or a Physical Uplink Shared Channel (PUSCH) .
A wireless communication method applied in a network device, comprising:

receiving a third Hybrid Automatic Repeat Request (HARQ) -Acknowledge (ACK) codebook in an uplink transmission, the third HARQ-ACK codebook being based on a first HARQ-ACK codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells.
The wireless communication method according to claim 12, wherein the third HARQ-ACK codebook is based on a concatenation of the first HARQ-ACK codebook and the second HARQ-ACK codebook.
The wireless communication method according to claim 12 or 13, wherein each serving cell in the first set of serving cells comprises a first Control Resource Set (CORESET) , and each serving cell in the second set of serving cells comprises a second CORESET.
The wireless communication method according to claim 14, wherein the first CORESET is provided with a higher layer parameter having a first value, and the second CORESET is provided with the higher layer parameter having a second value, the first value being different from the second value.
The wireless communication method according to claim 15, wherein the first value is 0.
The wireless communication method according to claim 14, wherein the first CORESET is not provided with a higher layer parameter, and the second CORESET is provided with the higher layer parameter having a second value.
The wireless communication method according to any of claims 15-17, wherein the second value is 1.
The wireless communication method according to any of claims 15-18, wherein the higher layer parameter is CORESETPoolIndex.
The wireless communication method according to any of claims 12-19, wherein each of the first HARQ-ACK codebook and the second HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.
The wireless communication method according to any of claims 12-20, wherein the third HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.
The wireless communication method according to any of claims 12-21, wherein the uplink transmission comprises a Physical Uplink Control Channel (PUCCH) and/or a Physical Uplink Shared Channel (PUSCH) .
A User Equipment (UE) , comprising:

a processing unit configured to:

obtain a first Hybrid Automatic Repeat Request (HARQ) -Acknowledge (ACK) codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells; and

obtain a third HARQ-ACK codebook based on the first HARQ-ACK codebook and the second HARQ-ACK codebook; and

a communication unit configured to transmit the third HARQ-ACK codebook in an uplink transmission.
The UE according to claim 23, wherein the processing unit is further configured to obtain the third HARQ-ACK codebook by:

generating the third HARQ-ACK codebook by concatenating the first HARQ-ACK codebook and the second HARQ-ACK codebook.
The UE according to claim 23 or 24, wherein each serving cell in the first set of serving cells comprises a first Control Resource Set (CORESET) , and each serving cell in the second set of serving cells comprises a second CORESET.
The UE according to claim 25, wherein the first CORESET is provided with a higher layer parameter having a first value, and the second CORESET is provided with the higher layer parameter having a second value, the first value being different from the second value.
The UE according to claim 26, wherein the first value is 0.
The UE according to claim 25, wherein the first CORESET is not provided with a higher layer parameter, and the second CORESET is provided with the higher layer parameter having a second value.
The UE according to any of claims 26-28, wherein the second value is 1.
The UE according to any of claims 26-29, wherein the higher layer parameter is CORESETPoolIndex.
The UE according to any of claims 23-30, wherein each of the first HARQ-ACK codebook and the second HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.
The UE according to any of claims 23-31, wherein the third HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.
The UE according to any of claims 23-32, wherein the uplink transmission comprises a Physical Uplink Control Channel (PUCCH) and/or a Physical Uplink Shared Channel (PUSCH) .
A network device, comprising:

a communication unit configured to receive a third Hybrid Automatic Repeat Request (HARQ) -Acknowledge (ACK) codebook in an uplink transmission, the third HARQ-ACK codebook being based on a first HARQ-ACK codebook for a first set of serving cells and a second HARQ-ACK codebook for a second set of serving cells.
The network device according to claim 34, wherein the third HARQ-ACK codebook is based on a concatenation of the first HARQ-ACK codebook and the second HARQ-ACK codebook.
The network device according to claim 34 or 35, wherein each serving cell in the first set of serving cells comprises a first Control Resource Set (CORESET) , and each serving cell in the second set of serving cells comprises a second CORESET.
The network device according to claim 36, wherein the first CORESET is provided with a higher layer parameter having a first value, and the second CORESET is provided with the higher layer parameter having a second value, the first value being different from the second value.
The network device according to claim 37, wherein the first value is 0.
The network device according to claim 36, wherein the first CORESET is not provided with a higher layer parameter, and the second CORESET is provided with the higher layer parameter having a second value.
The network device according to any of claims 37-39, wherein the second value is 1.
The network device according to any of claims 37-40, wherein the higher layer parameter is CORESETPoolIndex.
The network device according to any of claims 34-41, wherein each of the first HARQ-ACK codebook and the second HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.
The network device according to any of claims 34-42, wherein the third HARQ-ACK codebook is a Type-1 HARQ-ACK codebook.
The network device according to any of claims 34-43, wherein the uplink transmission comprises a Physical Uplink Control Channel (PUCCH) and/or a Physical Uplink Shared Channel (PUSCH) .
A User Equipment (UE) , comprising:

a memory having computer program stored thereon; and

a processor configured to invoke and run the computer program whereby the UE is operative to perform the method of any of claims 1-11.
A chip, comprising a processor configured to invoke and run computer program from a memory whereby an apparatus provided with the chip is operative to perform the method of any of claims 1-11.
A computer readable storage medium having computer program stored thereon, the computer program, when executed by a computer, causing the computer to perform the method according to any of claims 1-11.
A computer program product, comprising computer program instructions, the computer program instructions, when executed by a computer, causing the computer to perform the method according to any of claims 1-11.
A computer program, the computer program, when executed by a computer, causing the computer to perform the method according to any of claims 1-11.
A network device, comprising:

a memory having computer program stored thereon; and

a processor configured to invoke and run the computer program whereby the network device is operative to perform the method of any of claims 12-22.
A chip, comprising a processor configured to invoke and run computer program from a memory whereby an apparatus provided with the chip is operative to perform the method of any of claims 12-22.
A computer readable storage medium having computer program stored thereon, the computer program, when executed by a computer, causing the computer to perform the method according to any of claims 12-22.
A computer program product, comprising computer program instructions, the computer program instructions, when executed by a computer, causing the computer to perform the method according to any of claims 12-22.
A computer program, the computer program, when executed by a computer, causing the computer to perform the method according to any of claims 12-22.