WO2023077435A1

WO2023077435A1 - Method and apparatus for multiplexing sr with harq-ack feedback for a multicast transmission

Info

Publication number: WO2023077435A1
Application number: PCT/CN2021/129023
Authority: WO
Inventors: Haipeng Lei
Original assignee: Lenovo (Beijing) Limited
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2023-05-11

Abstract

Embodiments of the present disclosure relate to multiplexing a scheduling request (SR) with hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for a multicast service. According to some embodiments of the disclosure, a method performed by a user equipment (UE) may include: receiving a physical downlink shared channel (PDSCH), wherein the PDSCH is common to a group of UEs including the UE; determining to transmit a negative acknowledgement (NACK) feedback corresponding to the PDSCH in a slot; in response to determining to transmit a negative SR in the slot, transmitting a first sequence in a first resource in the slot; and in response to determining to transmit a positive SR in the slot, transmitting a second sequence in a second resource in the slot.

Description

METHOD AND APPARATUS FOR MULTIPLEXING SR WITH HARQ-ACK FEEDBACK FOR A MULTICAST TRANSMISSION

TECHNICAL FIELD

Embodiments of the present disclosure generally relate to wireless communication technology, and more particularly to multiplexing a scheduling request (SR) with hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for a multicast service.

BACKGROUND

Wireless communication systems are widely deployed to provide various telecommunication services, such as telephony, video, data, messaging, broadcasts, and so on. Wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power) . Examples of wireless communication systems may 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 also be referred to as new radio (NR) systems.

A wireless communication system may support multicast and broadcast services (MBSs) . One or more user equipment (UE) may be grouped as an MBS group and may receive multicast transmissions from a base station (BS) via a physical downlink shared channel (PDSCH) . The one or more UEs may transmit hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the PDSCH transmission through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) .

The PUCCH can be used to report different kinds of uplink control information (UCI) including the HARQ-ACK feedback as described above and a scheduling request (SR) . For example, a UE may transmit a scheduling request (SR) to a BS for requesting an uplink resource.

There is a need for handling the HARQ-ACK feedback transmissions of a multicast service and the SR transmission in a wireless communication system.

SUMMARY

Some embodiments of the present disclosure provide a user equipment (UE) . The UE may include: a transceiver; and a processor coupled to the transceiver. The processor may be configured to: receive a physical downlink shared channel (PDSCH) , wherein the PDSCH is common to a group of UEs including the UE; determine to transmit a negative acknowledgement (NACK) feedback corresponding to the PDSCH in a slot; in response to determining to transmit a negative scheduling request (SR) in the slot, transmit a first sequence in a first resource in the slot, wherein the first sequence corresponds to the negative SR and the first resource is configured for transmitting the NACK feedback; and in response to determining to transmit a positive SR in the slot, transmit a second sequence in a second resource in the slot, wherein the second sequence corresponds to the positive SR and the second resource is configured for transmitting the NACK feedback.

Some embodiments of the present disclosure provide a user equipment (UE) . The UE may include: a transceiver; and a processor coupled to the transceiver. The processor may be configured to: receive a physical downlink shared channel (PDSCH) , wherein the PDSCH is common to a group of UEs including the UE, and hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the PDSCH is indicated to be transmitted in a slot; determine to transmit a positive scheduling request (SR) in the slot; in response to the PDSCH being correctly received, transmit a first signal corresponding to the positive SR in a first resource configured specifically for the UE for transmitting a positive SR in the slot; and in response to the PDSCH being incorrectly received, transmit a second signal indicating negative ACK (NACK) feedback corresponding to the PDSCH in the first resource in the slot, wherein the second signal is different from the first signal.

Some embodiments of the present disclosure provide a base station (BS) . The BS may include: a transceiver; and a processor coupled to the transceiver. The processor may be configured to: transmit, to a group of user equipment (UEs) , a physical downlink shared channel (PDSCH) , wherein hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the PDSCH is indicated to be transmitted in a slot; and at least one of the following: in response to receiving, from a UE of the group of UEs, a first sequence corresponding to a negative scheduling request (SR) in a first resource configured for negative acknowledgement (NACK) feedback in the slot, determine that the PDSCH is incorrectly received by the UE; or in response to receiving, from the UE of the group of UEs, a second sequence corresponding to a positive SR in a second resource configured for NACK feedback in the slot, determine that the PDSCH is incorrectly received by the UE and the positive SR is transmitted by the UE.

Some embodiments of the present disclosure provide a base station (BS) . The BS may include: a transceiver; and a processor coupled to the transceiver. The processor may be configured to: transmit a physical downlink shared channel (PDSCH) to a group of user equipment (UEs) , wherein hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the PDSCH is indicated to be transmitted in a slot; and at least one of the following: in response to receiving, from a UE of the group of UEs, a first signal corresponding to a positive scheduling request (SR) in a first resource configured specifically for the UE for transmitting a positive SR in the slot, determine that the PDSCH is correctly received by the UE and a positive SR is transmitted by the UE; or in response to receiving, from the UE of the group of UEs, a second signal indicating negative ACK (NACK) feedback corresponding to the PDSCH in the first resource in the slot, determine that the PDSCH is incorrectly received by the UE and a positive SR is transmitted by the UE, wherein the second signal is different from the first signal.

Some embodiments of the present disclosure provide a method for wireless communication performed by a user equipment (UE) . The method may include: receiving a physical downlink shared channel (PDSCH) , wherein the PDSCH is common to a group of UEs including the UE; determining to transmit a negative acknowledgement (NACK) feedback corresponding to the PDSCH in a slot; in response to determining to transmit a negative scheduling request (SR) in the slot, transmitting a first sequence in a first resource in the slot, wherein the first sequence corresponds to the negative SR and the first resource is configured for transmitting the NACK feedback; and in response to determining to transmit a positive SR in the slot, transmitting a second sequence in a second resource in the slot, wherein the second sequence corresponds to the positive SR and the second resource is configured for transmitting the NACK feedback.

Some embodiments of the present disclosure provide a method for wireless communication performed by a user equipment (UE) . The method may include: receiving a physical downlink shared channel (PDSCH) , wherein the PDSCH is common to a group of UEs including the UE, and hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the PDSCH is indicated to be transmitted in a slot; determining to transmit a positive scheduling request (SR) in the slot; in response to the PDSCH being correctly received, transmitting a first signal corresponding to the positive SR in a first resource configured specifically for the UE for transmitting a positive SR in the slot; and in response to the PDSCH being incorrectly received, transmitting a second signal indicating negative ACK (NACK) feedback corresponding to the PDSCH in the first resource in the slot, wherein the second signal is different from the first signal.

Some embodiments of the present disclosure provide a method for wireless communication performed by a base station (BS) . The method may include: transmitting, to a group of user equipment (UEs) , a physical downlink shared channel (PDSCH) , wherein hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the PDSCH is indicated to be transmitted in a slot; and at least one of the following: in response to receiving, from a UE of the group of UEs, a first sequence corresponding to a negative scheduling request (SR) in a first resource configured for negative acknowledgement (NACK) feedback in the slot, determining that the PDSCH is incorrectly received by the UE; or in response to receiving, from the UE of the group of UEs, a second sequence corresponding to a positive SR in a second resource configured for NACK feedback in the slot, determining that the PDSCH is incorrectly received by the UE and the positive SR is transmitted by the UE.

Some embodiments of the present disclosure provide a method for wireless communication performed by a base station (BS) . The method may include: transmitting a physical downlink shared channel (PDSCH) to a group of user equipment (UEs) , wherein hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the PDSCH is indicated to be transmitted in a slot; and at least one of the following: in response to receiving, from a UE of the group of UEs, a first signal corresponding to a positive scheduling request (SR) in a first resource configured specifically for the UE for transmitting a positive SR in the slot, determining that the PDSCH is correctly received by the UE and a positive SR is transmitted by the UE; or in response to receiving, from the UE of the group of UEs, a second signal indicating negative ACK (NACK) feedback corresponding to the PDSCH in the first resource in the slot, determining that the PDSCH is incorrectly received by the UE and a positive SR is transmitted by the UE, wherein the second signal is different from the first signal.

Some embodiments of the present disclosure provide an apparatus. According to some embodiments of the present disclosure, the apparatus may include: at least one non-transitory computer-readable medium having stored thereon computer-executable instructions; at least one receiving circuitry; at least one transmitting circuitry; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry and the at least one transmitting circuitry, wherein the at least one non-transitory computer-readable medium and the computer executable instructions may be configured to, with the at least one processor, cause the apparatus to perform a method according to some embodiments of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe the manner in which the advantages and features of the disclosure can be obtained, a description of the disclosure is rendered by reference to specific embodiments thereof, which are illustrated in the appended drawings. These drawings depict only exemplary embodiments of the disclosure and are not therefore to be considered limiting of its scope.

FIG. 1 illustrates a schematic diagram of a wireless communication system in accordance with some embodiments of the present disclosure;

FIG. 2 illustrates a flow chart of an exemplary procedure of wireless communications in accordance with some embodiments of the present disclosure;

FIG. 3 illustrates a flow chart of an exemplary procedure of wireless communications in accordance with some embodiments of the present disclosure;

FIG. 4 illustrates a flow chart of an exemplary procedure of wireless communications in accordance with some embodiments of the present disclosure;

FIG. 5 illustrates a flow chart of an exemplary procedure of wireless communications in accordance with some embodiments of the present disclosure; and

FIG. 6 illustrates a block diagram of an exemplary apparatus in accordance with some embodiments of the present disclosure.

DETAILED DESCRIPTION

The detailed description of the appended drawings is intended as a description of the preferred embodiments of the present disclosure and is not intended to represent the only form in which the present disclosure may be practiced. It should be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the present disclosure.

Reference will now be made in detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. To facilitate understanding, embodiments are provided under specific network architecture and new service scenarios, such as the 3rd generation partnership project (3GPP) 5G (NR) , 3GPP long-term evolution (LTE) Release 8, and so on. It is contemplated that along with the developments of network architectures and new service scenarios, all embodiments in the present disclosure are also applicable to similar technical problems; and moreover, the terminologies recited in the present disclosure may change, which should not affect the principles of the present disclosure.

FIG. 1 illustrates a schematic diagram of a wireless communication system 100 in accordance with some embodiments of the present disclosure.

As shown in FIG. 1, a wireless communication system 100 may include some UEs 101 (e.g., UE 101a and UE 101b) and a base station (e.g., BS 102) . Although a specific number of UEs 101 and BS 102 are depicted in FIG. 1, it is contemplated that any number of UEs and BSs may be included in the wireless communication system 100.

The UE (s) 101 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like. According to some embodiments of the present disclosure, the UE (s) 101 may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network. In some embodiments of the present disclosure, the UE (s) 101 includes wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like. Moreover, the UE (s) 101 may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art. The UE (s) 101 may communicate with the BS 102 via uplink (UL) communication signals.

The BS 102 may be distributed over a geographic region. In certain embodiments of the present disclosure, the BS 102 may also be referred to as an access point, an access terminal, a base, a base unit, a macro cell, a Node-B, an evolved Node B (eNB) , a gNB, a Home Node-B, a relay node, or a device, or described using other terminology used in the art. The BS 102 is generally a part of a radio access network that may include one or more controllers communicably coupled to one or more corresponding BSs 102. The BS 102 may communicate with UE (s) 101 via downlink (DL) communication signals.

The wireless communication system 100 may be compatible with any type of network that is capable of sending and receiving wireless communication signals. For example, the wireless communication system 100 is compatible with a wireless communication network, a cellular telephone network, a time division multiple access (TDMA) -based network, a code division multiple access (CDMA) -based network, an orthogonal frequency division multiple access (OFDMA) -based network, an LTE network, a 3GPP-based network, a 3GPP 5G network, a satellite communications network, a high altitude platform network, and/or other communications networks.

In some embodiments of the present disclosure, the wireless communication system 100 is compatible with 5G NR of the 3GPP protocol. For example, BS 102 may transmit data using an orthogonal frequency division multiple (OFDM) modulation scheme on the DL and the UE (s) 101 may transmit data on the UL using a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) or cyclic prefix-OFDM (CP-OFDM) scheme. More generally, however, the wireless communication system 100 may implement some other open or proprietary communication protocols, for example, WiMAX, among other protocols.

In some embodiments of the present disclosure, the BS 102 and UE (s) 101 may communicate using other communication protocols, such as the IEEE 802.11 family of wireless communication protocols. Further, in some embodiments of the present disclosure, the BS 102 and UE (s) 101 may communicate over licensed spectrums, whereas in some other embodiments, the BS 102 and UE (s) 101 may communicate over unlicensed spectrums. The present disclosure is not intended to be limited to the implementation of any particular wireless communication system architecture or protocol.

In some embodiments of the present disclosure, the wireless communication system 100 may support multicast and broadcast services (MBSs) . For example, one or more UEs (e.g., UE 101a and UE 101b) may be grouped as an MBS group to receive MBSs (e.g., an MBS PDSCH) from a BS (e.g., BS 102) . Several transmission schemes including, but not limited to, the following three transmission schemes may be applied for multicast transmission: a point-to-point (PTP) transmission scheme, point-to-multipoint (PTM) transmission scheme 1, and PTM transmission scheme 2. The definitions of these schemes are specified in 3GPP specifications.

A group-common radio network temporary identifier (RNTI) (e.g., group-RNTI (G-RNTI) ) is introduced for an MBS so that a UE can differentiate a DCI scheduling a group-common PDSCH carrying an MBS service (e.g., an MBS PDSCH) from a DCI scheduling UE-specific PDSCH carrying a unicast service. For example, the cyclic redundancy check (CRC) of the DCI scheduling the unicast PDSCH may be scrambled by a UE-specific RNTI (e.g., cell-RNTI (C-RNTI) ) and the scheduled unicast PDSCH may also be scrambled by the UE-specific RNTI. The CRC of the DCI scheduling the group-common PDSCH may be scrambled by a G-RNTI and the scheduled group-common PDSCH carrying the MBS may also be scrambled by the G-RNTI. When a UE supports multiple MBS services, each service may be configured with a G-RNTI specific to the service. In other words, from a UE’s perspective, the G-RNTIs can be used to differentiate the multiple MBS services.

The HARQ-ACK feedback from UEs corresponding to a downlink multicast transmission is essential for the multicast services in order to satisfy the QoS requirement, e.g., reliability. Several options including, but not limited to, the following two options may be applied for HARQ-ACK feedback transmission corresponding to a PDSCH carrying a multicast service: (1) Group NACK-only transmission, and (2) UE-specific ACK/NACK transmission. The descriptions of the two options are listed below:

● Option (1) : Group NACK-only transmission

■ A UE does not transmit an acknowledgement (ACK) to the BS when a PDSCH is successfully received.

■ The UE transmits a negative ACK (NACK) to the BS when the PDSCH is not successfully received.

■ A group of UEs share the same resource to transmit respective NACK (s) , if any.

● Option (2) : UE-specific ACK/NACK transmission

■ A UE transmits an ACK to the BS when a PDSCH is successfully received.

■ A UE transmits a NACK to the BS when the PDSCH is not successfully received.

■ Each UE of the group of UEs is provided with a specific PUCCH resource for the corresponding UE to transmit a respective ACK/NACK to the BS.

Option (1) can minimize PUCCH resource overhead while the BS cannot differentiate which UE of the group of UEs transmits the NACK in the shared PUCCH resource and cannot support PTP based retransmission. From a UE’s perspective, when it is configured with Option (1) , the UE does not expect to receive a DCI with a CRC scrambled by a UE-specific RNTI (e.g., C-RNTI) for scheduling the retransmission of a transport block (TB) which is initially transmitted in PTM scheme 1. Option (2) may have a relatively minor standardization effort based on an existing HARQ-ACK codebook determination and the BS can differentiate an ACK or NACK from a corresponding UE at the cost of a UE-specific PUCCH resource reservation.

On the other hand, when a UE (e.g., UE 101a or UE 101b) intends to transmit an SR (e.g., a positive SR as defined in 3GPP specifications) in a slot for requesting a UL resource, the UE may transmit a PUCCH in the PUCCH resource for the corresponding SR configuration. The UE may be configured with one or more SR configurations. In some examples, each SR configuration may be associated with a corresponding traffic type or service. In some examples, an SR configuration may include an SR PUCCH format and resource, a periodicity and an offset within the periodicity. In some embodiments, two PUCCH formats, for example, PUCCH format #0 and PUCCH format #1, may be used to transmit an SR (e.g., a positive SR) . The definitions of PUCCH format #0 and PUCCH format #1 are specified in 3GPP specifications.

PUCCH format #0 may be based on sequence selection. For example, different sequences can be used to indicate different information carried by the PUCCH. In some embodiments, by applying different values of a cyclic shift α, different sequences can be generated. The cyclic shift α may be computed based on, among others, an initial cyclic shift (e.g., m ₀) and a cyclic shift parameter (e.g., m _CS) .

For example, a sequence x (n) for a positive SR transmission using PUCCH format #0 can be generated according to:

where the cyclic shift α may vary as a function of the symbol and slot number according to

wherein m ₀ may be provided by a higher layer parameter such as initialCyclicShift of PUCCH-format0, and m _cs=0.

The definitions of the above parameters for PUCCH are specified in 3GPP specifications, for example, TS 38.211.

In some examples, for a positive SR transmission using PUCCH format #1, the UE may transmit the PUCCH by setting the information bit carried by the PUCCH as b (0) =0.

The UE may transmit HARQ-ACK feedback corresponding to a PDSCH transmission through a PUCCH. In some examples, when a UE transmits a PUCCH with HARQ-ACK information using PUCCH format #0, the UE may determines values m ₀ and m _CS for computing a value of the cyclic shift α, where m ₀ may be provided by initialCyclicShift of PUCCH-format0 and m _CS may be determined from the value of one HARQ-ACK information bit or from the values of two HARQ-ACK information bits as shown in below Tables 1 and 2, respectively. It should be understood that Tables 1 and 2 are only for illustrative purposes, and should not be construed as limiting the embodiments of the present disclosure.

Table 1: Mapping of values for one HARQ-ACK information bit to sequences for PUCCH format #0

HARQ-ACK Value	0	1
Sequence cyclic shift	m _CS=0	m _CS=6

Table 2: Mapping of values for two HARQ-ACK information bits to sequences for PUCCH format #0

HARQ-ACK Value	{0, 0}	{0, 1}	{1, 1}	{1, 0}
Sequence cyclic shift	m _CS=0	m _CS=3	m _CS=6	m _CS=9

In some embodiment, the transmission of HARQ-ACK feedback may collide with the transmission of an SR. Multiplexing of HARQ-ACK feedback with SR in a PUCCH may occur.

For example, for HARQ-ACK feedback multiplexing with a positive SR in a slot, in the case of at most two HARQ-ACK information bits, a UE may transmit a PUCCH in a resource using PUCCH format #0 in physical resource block (s) (PRB (s) ) for HARQ-ACK information. The UE may determine a value of m ₀ and m _CS for computing a value of cyclic shift α, where m ₀ is provided by initialcyclicshift of PUCCH-format0, and m _CS may be determined from the value of one HARQ-ACK information bit or from the values of two HARQ-ACK information bits as shown in below Tables 3 and 4, respectively. It should be understood that Tables 3 and 4 are only for illustrative purposes, and should not be construed as limiting the embodiments of the present disclosure.

Table 3: Mapping of values for one HARQ-ACK information bit and positive SR to sequences for PUCCH format #0

HARQ-ACK Value	0	1
Sequence cyclic shift	m _CS=3	m _CS=9

Table 4: Mapping of values for two HARQ-ACK information bits and positive SR to sequences for PUCCH format #0

HARQ-ACK Value	{0, 0}	{0, 1}	{1, 1}	{1, 0}
Sequence cyclic shift	m _CS=1	m _CS=4	m _CS=7	m _CS=10

If the UE would transmit a negative SR and a PUCCH with at most two HARQ-ACK information bits in a resource using PUCCH format #0, the UE transmits the PUCCH in the resource using PUCCH format #0 for HARQ-ACK information.

As mentioned above, MBS may support the NACK-only based HARQ-ACK feedback. When the NACK-only based HARQ-ACK feedback is to be transmitted in a slot where a positive SR is also to be transmitted, according to the above described behavior of multiplexing HARQ-ACK feedback with SR, a UE may transmit a PUCCH format #0 on a PRB configured for the NACK-only based HARQ-ACK feedback with different m _CS values to indicate the positive SR.

For example, when only NACK-only based HARQ-ACK feedback is to be transmitted in a PUCCH format #0, m ₀ may be provided by initialcyclicshift of PUCCH-format0, and m _cs=0 for indicating a NACK. When the NACK-only based HARQ-ACK feedback multiplexes with a positive SR in a PUCCH format #0, m ₀ may be provided by initialcyclicshift of PUCCH-format0, and m _cs=3 for indicating a NACK and a positive SR. In that sense, two different cyclic shifts are used to generate two different sequences for PUCCH format #0, one for indicating only NACK-only based HARQ-ACK feedback and another for indicating the positive SR and the NACK-only based HARQ-ACK feedback.

However, there is a problem with the above mechanism as a group-common PUCCH resource is shared by UEs in the same group when the NACK-only based HARQ-ACK feedback is adopted. For example, when two or more UEs in the same group transmit a positive SR and NACK-only based HARQ-ACK feedback in a slot, the above mechanism will inevitably cause PUCCH resource collision since, for example, the PRB for PUCCH format #0, m ₀ provided by initialcyclicshift of PUCCH-format0, and m _cs=3 (corresponding to a NACK bit) for indicating NACK and positive SR, are shared by the group of UEs.

In that sense, in response to the reception of the sequence generated based on m _cs=3, the BS can only know that at least one UE in the group transmits a NACK corresponding to the PTM transmission and cannot differentiate which UE in the group transmits the positive SR. As a result, the BS cannot transmit a UL grant to the UE which really needs the UL resource.

Embodiments of the present disclosure provide solutions to solve the above issues. For example, solutions for transmitting an SR and NACK-only based HARQ-ACK feedback in a slot are proposed. Solutions proposed in this disclosure can solve the misunderstanding between a BS and a UE on the multiplexing of an SR with NACK-only based HARQ-ACK feedback. More details on the embodiments of the present disclosure will be illustrated in the following text in combination with the appended drawings.

In some embodiments of the present disclosure, for a positive SR without multiplexing with NACK-only based HARQ-ACK feedback in a slot (hereinafter referred to as “Case 1” ) , for example, when the corresponding PDSCH transmission is correctly received by the UE, the positive SR may be transmitted in a PUCCH using PUCCH format #0 in the PRB configured for SR transmission. The UE may determine the values of m ₀ and m _CS for computing the value of cyclic shift α. For example, m ₀ may be provided by a higher layer parameter such as initialcyclicshift of PUCCH-format0 and the value of m _CS may be denoted as j (m _cs=j) , where j may be predefined in a standard (s) . For instance, j may be an integer value within the range of [0, 11] . For instance, j=0 when only positive SR is transmitted.

For a negative SR multiplexing with NACK-only based HARQ-ACK feedback in a slot (hereinafter referred to as “Case 4” ) , for example, when the corresponding PDSCH transmission is incorrectly received by the UE, the negative SR multiplexing with NACK-only based HARQ-ACK feedback may be transmitted in a PUCCH using PUCCH format #0 in a resource configured for the NACK-only based HARQ-ACK feedback. The resource may be a specific PRB (hereinafter, “PRB #A” ) configured for NACK-only based HARQ-ACK feedback. PRB #A may be a PRB having a predefined position among at least one PRB (e.g., contiguous PRB (s) ) configured by RRC signaling reserved for SR multiplexing with NACK-only HARQ-ACK feedback. For example, PRB #A may be the lowest PRB in the frequency domain among the configured at least one PRB or the highest PRB in frequency domain among the configured at least one PRB.

In Case 4, the UE may determine the values of m ₀ and m _CS for computing the value of cyclic shift α. For example, m ₀ may be provided by a higher layer parameter initialcyclicshift of PUCCH-format0, and the value of m _CS may be denoted as k (m _cs=k) , where k may be predefined in a standard (s) . For instance, k may be a predefined integer value within the range of [0, 11] . For instance, k=0 when negative SR and NACK-only based HARQ-ACK feedback are multiplexed.

For a positive SR multiplexing with NACK-only based HARQ-ACK feedback in a slot (hereinafter referred to as “Case 2” ) , the positive SR multiplexing with NACK-only based HARQ-ACK feedback may be transmitted in a PUCCH using PUCCH format #0 in a resource configured for the NACK-only based HARQ-ACK feedback. The resource may be a PRB (hereinafter, “PRB #B” ) configured for NACK-only based HARQ-ACK feedback. PRB #B may be one of the at least one PRB reserved for SR multiplexing with NACK-only HARQ-ACK feedback.

The UE may determine PRB #B based on various methods. For example, PRB #B may be selected from the at least one PRB based on at least one of: a value specific to the UE (denoted as “Z” ) , or the number of PRBs of the at least one PRB (denoted as “N” ) . For example, Z can be the member ID of the UE in the UE group, or an integer value of the UE-specific RNTI (e.g., C-RNTI) . For example, PRB #B can be determined according to n _PRB=Z /N, wherein n _PRB denotes the index of PRB #B with reference to the PRB with the lowest PRB index of at least one PRB reserved for SR multiplexing with NACK-only HARQ-ACK feedback. The value of N may be relevant to the number of UEs which may transmit an SR in the same slot. The larger the value of N, the lower probability of PUCCH resource collision among the group of UEs and the less resource utilization efficiency.

In Case 2, the UE may determine the values of m ₀ and m _CS for computing a value of cyclic shift α. For example, m ₀ may be provided by a higher layer parameter initialcyclicshift of PUCCH-format0, and the value of m _CS may be determined based at least on a value specific to the UE (denoted as “X” ) . For example, X can be the member ID of the UE in the UE group, or an integer value of the UE-specific RNTI (e.g., C-RNTI) . X and Z may be the same or different. For example, the value of m _CS can be calculated according to m _cs=X mod 12. For example, the value of m _CS can be calculated according to m _cs=X mod (12/Y) , wherein Y is a factor for adjusting the distances among the multiple sequences per PRB. Theoretically, Y=1 to maximum 12 sequences per PRB. To further increase the distances among sequences for PUCCH format #0, Y can be set to 2, 3, 4, 6, etc. The value of Y may be configured by RRC signaling. The UE may determine the value of m _CS according to one of the above methods as described above or the BS may configure the value of m _CS to the UE. In some embodiments, the BS should guarantee that m _CS for Case 2 is not equal to k for Case 4 (m _cs≠k) when PRB #B for Case 2 is PRB #A for Case 4.

Table 5 below shows an example of sequence and resource determination for SR multiplexing with NACK-only based feedback according to the above embodiments. It should be understood that Table 5 is only for illustrative purposes, and should not be construed as limiting the embodiments of the present disclosure.

Table 5: Sequence and resource determination for SR multiplexing with NACK-only based feedback

In Table 5 as well as in the following contents of this disclosure, “ACK” in the “HARQ-ACK information” column means that the UE has correctly received the corresponding PDSCH and should not be interpreted as the transmission of an ACK since NACK-only based feedback is adopted. Moreover, Case 3 in Table 5 as well as in the following contents of this disclosure refers to the scenario where the UE has correctly received the corresponding PDSCH and determine to transmit a negative SR, and therefore may correspond to no PUCCH transmission.

In some embodiments of the present disclosure, similar as described above, for a positive SR without multiplexing with NACK-only based HARQ-ACK feedback in a slot (Case 1) , the positive SR may be transmitted in a PUCCH using PUCCH format #0 in the PRB configured for SR transmission. The UE may determine the values of m ₀ and m _CS for computing the value of cyclic shift α. For example, m ₀ may be provided by a higher layer parameter such as initialcyclicshift of PUCCH-format0 and the value of m _CSmay be denoted as j ₁ (m _cs=j ₁) , where j ₁ may be predefined in a standard (s) . For instance, j ₁ may be an integer value within the range of [0, 11] . For instance, j ₁=0 when only positive SR is transmitted.

For a positive SR multiplexing with NACK-only based HARQ-ACK feedback in a slot (Case 2) , the positive SR multiplexing with NACK-only based HARQ-ACK feedback may be transmitted in a PUCCH using PUCCH format #0 in the PRB configured for SR transmission. The UE may determine the values of m ₀ and m _CS for computing the value of cyclic shift α. For example, m ₀ may be provided by a higher layer parameter such as initialcyclicshift of PUCCH-format0 and the value of m _CSmay be determined by j ₁+i (m _cs=j ₁+i) , where i may be an integer value within the range of [1, 11] to define the distance between the sequence for indicating a positive SR only and the sequence for indicating a positive SR multiplexing with NACK-only based feedback. For example, i may be predefined in a standard (s) . For example, i can be set to 6, 4, 3, 2, 1, or other values.

For a negative SR multiplexing with NACK-only based HARQ-ACK feedback in a slot (Case 4) , the negative SR multiplexing with NACK-only based HARQ-ACK feedback may be transmitted in a PUCCH using PUCCH format #0 in the PUCCH resource reserved for NACK-only based HARQ-ACK feedback. The UE may determine the values of m ₀ and m _CS for computing the value of cyclic shift α. For example, m ₀ may be provided by a higher layer parameter such as initialcyclicshift of PUCCH-format0 and the value of m _CSmay be denoted as k ₁ (m _cs=k ₁) , where k ₁ may be predefined in a standard (s) . For instance, k ₁ may be an integer value within the range of [0, 11] . For instance, k ₁=0 in the case that the negative SR and NACK-only based HARQ-ACK feedback are multiplexed.

Table 6 below shows an example of sequence and resource determination for SR multiplexing with NACK-only based feedback according to the above embodiments. It should be understood that Table 6 is only for illustrative purposes, and should not be construed as limiting the embodiments of the present disclosure.

Table 6: Sequence and resource determination for SR multiplexing with NACK-only based feedback

In some embodiments of the present disclosure, each UE in a group of UEs may be configured with a UE-specific PUCCH resource for NACK-only based feedback transmission (also referred to as “UE-dedicated PUCCH resource reserved for NACK-only based feedback” ) .

For a positive SR without multiplexing with NACK-only based HARQ-ACK feedback in a slot (Case 1) , the positive SR may be transmitted in a PUCCH using PUCCH format #0 in the PRB configured for SR transmission. The UE may determine the values of m ₀ and m _CS for computing the value of cyclic shift α. For example, m ₀ may be provided by a higher layer parameter such as initialcyclicshift of PUCCH-format0 and the value of m _CS may be denoted as j ₂ (m _cs=j ₂) , where j ₂ may be predefined in a standard (s) . For instance, j ₂ may be an integer value within the range of [0, 11] . For instance, j ₂=0 when only positive SR is transmitted.

For a negative SR multiplexing with NACK-only based HARQ-ACK feedback in a slot (Case 4) , the negative SR multiplexing with NACK-only based HARQ-ACK feedback may be transmitted in a PUCCH using PUCCH format #0 in the UE-dedicated PUCCH resource for NACK-only based HARQ-ACK feedback. The UE may determine the values of m ₀ and m _CS for computing the value of cyclic shift α. For example, m ₀ may be provided by a higher layer parameter such as initialcyclicshift of PUCCH-format0 and the value of m _CS may be denoted as k ₂, where k ₂ may be predefined in a standard (s) . For instance, k ₂ may be an integer value within the range of [0, 11] . For instance, k ₂=0 in the case that the negative SR and NACK-only based HARQ-ACK feedback are multiplexed.

For a positive SR multiplexing with NACK-only based HARQ-ACK feedback in a slot (Case 2) , the positive SR multiplexing with NACK-only based HARQ-ACK feedback may be transmitted in the UE-dedicated PUCCH resource for NACK-only based feedback using PUCCH format #0. The UE may determine the values of m ₀ and m _CS for computing the value of cyclic shift α. For example, m ₀ may be provided by a higher layer parameter such as initialcyclicshift of PUCCH-format0 and the value of m _CS may be determined by k ₂+i ₂ (m _cs=k ₂+i ₂) , where i ₂ may be an integer value within range of [1, 11] to define the distance between the sequence for indicating a negative SR multiplexing with NACK-only based feedback and the sequence for indicating a positive SR multiplexing with NACK-only based feedback. For example, i ₂ may be predefined in a standard (s) . For example, i ₂ can be set to 6, 4, 3, 2, 1, or other values.

Table 7 below shows an example of sequence and resource determination for SR multiplexing with NACK-only based feedback according to the above embodiments. It should be understood that Table 7 is only for illustrative purposes, and should not be construed as limiting the embodiments of the present disclosure.

Table 7: Sequence and resource determination for SR multiplexing with NACK-only based feedback

In some embodiments of the present disclosure, for a positive SR without multiplexing NACK-only based HARQ-ACK feedback in a slot (Case 1) , the UE may transmit a PUCCH using PUCCH format #1 in the PRB configured for SR transmission. The UE may set the information bit to be transmitted by PUCCH format #1 to a predefined value (hereinafter, “value #A” ) and apply a corresponding modulation method to the information bit. For example, the information bit b (0) carried by the PUCCH may be set to “0” (b (0) =0) and binary phase shift keying (BPSK) modulation may be applied to the information bit.

For a positive SR multiplexing with NACK-only based HARQ-ACK feedback in a slot (Case 2) , the UE transmits may transmit a PUCCH using PUCCH format #1 in the PRB configured for SR transmission. In Case 2, the UE may set the information bit to be transmitted by PUCCH format #1 to a predefined value (hereinafter, “value #B” ) different from value #A.

For example, the information bit b (0) carried by the PUCCH may be set to “1” (b (0) =1) and BPSK modulation may be applied to the information bit. For example, the information bits b (0) and b (1) carried by the PUCCH may be set to “0” and “1” , respectively, and quadrature phase shift keying (QPSK) modulation may be applied to the information bits. For example, the information bits b (0) and b (1) carried by the PUCCH may be set to “1” and “0” , respectively, and QPSK modulation may be applied to the information bits. For example, the information bits b (0) and b (1) carried by the PUCCH may be set to “1” and “1” , respectively, and QPSK modulation may be applied to the information bits.

For a negative SR multiplexing with NACK-only based HARQ-ACK feedback in a slot (Case 4) , the UE may transmit the NACK-only based feedback in the PUCCH resource reserved for NACK-only based HARQ-ACK feedback.

In case 4, when PUCCH format #1 is applied, the information bit (s) to be transmitted by PUCCH format #1 may be set to a predefined value and a corresponding modulation method may be applied to the information bit (s) (e.g., b (0) =0 with BPSK modulation) . When PUCCH format #0 is applied, the value of m ₀ may be provided by a higher layer parameter such as initialcyclicshift of PUCCH-format0 and the value of m _CS may be a predefined value (e.g., m _CS= 0) .

Table 8 below shows an example of information bit (s) and resource determination for SR multiplexing with NACK-only based feedback according to the above embodiments. It should be understood that Table 8 is only for illustrative purposes, and should not be construed as limiting the embodiments of the present disclosure.

Table 8: information bit (s) and resource determination for SR multiplexing with NACK-only based feedback

FIG. 2 illustrates a flow chart of an exemplary procedure 200 for wireless communications in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 2. In some examples, the procedure may be performed by a UE, for example, UE 101 in FIG. 1.

Referring to FIG. 2, in operation 211, a UE may receive a PDSCH, wherein the PDSCH may be common to a group of UEs including the UE. In operation 213, the UE may determine to transmit a NACK feedback corresponding to the PDSCH in a slot.

In operation 215, in response to determining to transmit a negative SR in the slot, the UE may transmit a first sequence in a first resource in the slot. The first sequence may correspond to the negative SR. The first resource may be configured for transmitting the NACK feedback.

In operation 217, in response to determining to transmit a positive SR in the slot, the UE may transmit a second sequence in a second resource in the slot. The second sequence may correspond to the positive SR. The second resource may be configured for transmitting the NACK feedback.

In some embodiments of the present disclosure, the first resource may be shared by the group of UEs for transmitting the NACK feedback and the first sequence may be a common sequence to the group of UEs. In some examples, the first sequence may be determined according to m _cs=k. In some examples, the first resource may be PRB #A as described above.

The second resource may be on a PRB of at least one PRB, and the PRB may be determined based on at least one of: a value specific to the UE, or a number of PRBs of the at least one PRB. For example, the second resource may be on PRB #B as described above. The second sequence may be determined based on at least a value specific to the UE. For example, the second sequence may be determined based on m _cs=X mod 12 or m _cs=X mod (12/Y) as described above. The value specific to the UE may include: a member ID of the UE in the group, or an integer value of an RNTI specific to the UE.

In some embodiments of the present disclosure, the first resource may be configured specifically for the UE for transmitting the NACK feedback and the second resource may be the same as the first resource. The first sequence may be determined based on a cyclic shift parameter. The second sequence may be determined based on a cyclic shift parameter and an offset value. The offset value may define a distance between the first sequence and the second sequence. For example, the first sequence may be determined based on m _cs=k ₂ and the second sequence may be determined based on m _cs=k ₂+i ₂.

It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary procedure 200 may be changed and some of the operations in exemplary procedure 200 may be eliminated or modified, without departing from the spirit and scope of the disclosure.

FIG. 3 illustrates a flow chart of an exemplary procedure 300 for wireless communications in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 3. In some examples, the procedure may be performed by a UE, for example, UE 101 in FIG. 1.

Referring to FIG. 3, in operation 311, a UE may receive a PDSCH, wherein the PDSCH may be common to a group of UEs including the UE, and HARQ-ACK feedback corresponding to the PDSCH may be indicated to be transmitted in a slot. In operation 313, the UE may determine to transmit a positive SR in the slot.

In operation 315, in response to the PDSCH being correctly received, the UE may transmit a first signal corresponding to the positive SR in a first resource configured specifically for the UE for transmitting a positive SR in the slot. In operation 317, in response to the PDSCH being incorrectly received, the UE may transmit a second signal indicating negative ACK (NACK) feedback corresponding to the PDSCH in the first resource in the slot, wherein the second signal is different from the first signal.

In some embodiments of the present disclosure, the first signal may be a first sequence and the second signal may be a second sequence. The first sequence may be determined based on a cyclic shift parameter. The second sequence may be determined based on a cyclic shift parameter and an offset value. The offset value may define a distance between the first sequence and the second sequence. For example, the first sequence may be determined based on m _cs=j ₁ and the second sequence may be determined based on m _cs=j ₁+i.

In some embodiments of the present disclosure, the first signal may correspond to a first bit and the first bit may be modulated according to a first modulation method. In some examples, the second signal may correspond to a second bit and the second bit may be modulated according to the first modulation method. In some examples, the second signal may correspond to two bits and the two bits may be modulated according to a second modulation method.

For example, the first signal may correspond to the information bit b (0) (e.g., b (0) =0) modulated by BPSK modulation. For example, the second signal may correspond to the information bit b (0) (e.g., b (0) =1) modulated by BPSK modulation. For example, the second signal may correspond to the information bits b (0) and b (1) (e.g., b (0) =0 and b (1) =1) modulated by QPSK modulation.

It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary procedure 300 may be changed and some of the operations in exemplary procedure 300 may be eliminated or modified, without departing from the spirit and scope of the disclosure.

FIG. 4 illustrates a flow chart of an exemplary procedure 400 for wireless communications in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 4. In some examples, the procedure may be performed by a BS, for example, BS 102 in FIG. 1.

Referring to FIG. 4, in operation 411, a BS may transmit, to a group of UEs, a PDSCH, wherein HARQ-ACK feedback corresponding to the PDSCH may be indicated to be transmitted in a slot.

In operation 413, the BS may perform at least one of the following: in response to receiving, from a UE of the group of UEs, a first sequence corresponding to an SR in a first resource configured for NACK feedback in the slot, determining that the PDSCH is incorrectly received by the UE; or in response to receiving, from the UE of the group of UEs, a second sequence corresponding to a positive SR in a second resource configured for NACK feedback in the slot, determining that the PDSCH is incorrectly received by the UE and the positive SR is transmitted by the UE.

In some embodiments of the present disclosure, the first resource may be configured, by the BS, specifically for the UE for transmitting the NACK feedback and the second resource may be the same as the first resource. The first sequence may be determined based on a cyclic shift parameter. The second sequence may be determined based on a cyclic shift parameter and an offset value. The offset value may define a distance between the first sequence and the second sequence. For example, the first sequence may be determined based on m _cs=k ₂ and the second sequence may be determined based on m _cs=k ₂+i ₂.

It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary procedure 400 may be changed and some of the operations in exemplary procedure 400 may be eliminated or modified, without departing from the spirit and scope of the disclosure.

FIG. 5 illustrates a flow chart of an exemplary procedure 500 for wireless communications in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 5. In some examples, the procedure may be performed by a BS, for example, BS 102 in FIG. 1.

Referring to FIG. 5, in operation 511, a BS may transmit, to a group of UEs, a PDSCH, wherein HARQ-ACK feedback corresponding to the PDSCH may be indicated to be transmitted in a slot.

In operation 513, the BS may perform at least one of the following: in response to receiving, from a UE of the group of UEs, a first signal corresponding to a positive SR in a first resource configured specifically for the UE for transmitting a positive SR in the slot, determining that the PDSCH is correctly received by the UE and a positive SR is transmitted by the UE; or in response to receiving, from the UE of the group of UEs, a second signal indicating NACK feedback corresponding to the PDSCH in the first resource in the slot, determining that the PDSCH is incorrectly received by the UE and a positive SR is transmitted by the UE, wherein the second signal may be different from the first signal.

It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary procedure 500 may be changed and some of the operations in exemplary procedure 500 may be eliminated or modified, without departing from the spirit and scope of the disclosure.

FIG. 6 illustrates a block diagram of an exemplary apparatus 600 according to some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 6.

As shown in FIG. 6, the apparatus 600 may include at least one processor 606 and at least one transceiver 602 coupled to the processor 606. The apparatus 600 may be a UE or a BS.

Although in this figure, elements such as the at least one transceiver 602 and processor 606 are described in the singular, the plural is contemplated unless a limitation to the singular is explicitly stated. In some embodiments of the present application, the transceiver 602 may be divided into two devices, such as a receiving circuitry and a transmitting circuitry. In some embodiments of the present application, the apparatus 600 may further include an input device, a memory, and/or other components.

In some embodiments of the present application, the apparatus 600 may be a UE. The transceiver 602 and the processor 606 may interact with each other so as to perform the operations with respect to the UE described in FIGS. 1-5. In some embodiments of the present application, the apparatus 600 may be a BS. The transceiver 602 and the processor 606 may interact with each other so as to perform the operations with respect to the BS described in FIGS. 1-5.

In some embodiments of the present application, the apparatus 600 may further include at least one non-transitory computer-readable medium.

For example, in some embodiments of the present disclosure, the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 606 to implement the method with respect to the UE as described above. For example, the computer-executable instructions, when executed, cause the processor 606 interacting with transceiver 602, so as to perform the operations with respect to the UE described in FIGS. 1-5.

In some embodiments of the present disclosure, the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 606 to implement the method with respect to the BS as described above. For example, the computer-executable instructions, when executed, cause the processor 606 interacting with transceiver 602 to perform the operations with respect to the BS described in FIGS. 1-5.

Those having ordinary skill in the art would understand that the operations or steps of a method described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. Additionally, in some aspects, the operations or steps of a method may reside as one or any combination or set of codes and/or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.

While this disclosure has been described with specific embodiments thereof, it is evident that many alternatives, modifications, and variations may be apparent to those skilled in the art. For example, various components of the embodiments may be interchanged, added, or substituted in other embodiments. Also, all of the elements of each figure are not necessary for the operation of the disclosed embodiments. For example, one of ordinary skill in the art of the disclosed embodiments would be enabled to make and use the teachings of the disclosure by simply employing the elements of the independent claims. Accordingly, embodiments of the disclosure as set forth herein are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit and scope of the disclosure.

In this document, the terms "includes, " "including, " or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "a, " "an, " or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element. Also, the term "another" is defined as at least a second or more. The term "having" and the like, as used herein, are defined as "including. " Expressions such as "A and/or B" or "at least one of A and B" may include any and all combinations of words enumerated along with the expression. For instance, the expression "A and/or B" or "at least one of A and B" may include A, B, or both A and B. The wording "the first, " "the second" or the like is only used to clearly illustrate the embodiments of the present application, but is not used to limit the substance of the present application.

Claims

A user equipment (UE) , comprising:

a transceiver; and

a processor coupled to the transceiver, wherein the processor is configured to:

receive a physical downlink shared channel (PDSCH) , wherein the PDSCH is common to a group of UEs including the UE;

determine to transmit a negative acknowledgement (NACK) feedback corresponding to the PDSCH in a slot;

in response to determining to transmit a negative scheduling request (SR) in the slot, transmit a first sequence in a first resource in the slot, wherein the first sequence corresponds to the negative SR and the first resource is configured for transmitting the NACK feedback; and

in response to determining to transmit a positive SR in the slot, transmit a second sequence in a second resource in the slot, wherein the second sequence corresponds to the positive SR and the second resource is configured for transmitting the NACK feedback.
The UE of claim 1, wherein the first resource is shared by the group of UEs for transmitting the NACK feedback and the first sequence is a common sequence to the group of UEs.
The UE of claim 1, wherein the second resource is on a physical resource block (PRB) of at least one PRB, and the PRB is determined based on at least one of: a value specific to the UE, or a number of PRBs of the at least one PRB.
The UE of claim 1, wherein the second sequence is determined based on at least a value specific to the UE.
The UE of claim 3 or 4, wherein the value specific to the UE comprises: a member ID of the UE in the group, or an integer value of a radio network temporary identifier (RNTI) specific to the UE.
The UE of claim 1, wherein the first resource is configured specifically for the UE for transmitting NACK feedback and the second resource is the same as the first resource.
The UE of claim 6, wherein the first sequence is determined based on a cyclic shift parameter and the second sequence is determined based on a cyclic shift parameter and an offset value.
A user equipment (UE) , comprising:

a transceiver; and

a processor coupled to the transceiver, wherein the processor is configured to:

receive a physical downlink shared channel (PDSCH) , wherein the PDSCH is common to a group of UEs including the UE, and hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the PDSCH is indicated to be transmitted in a slot;

determine to transmit a positive scheduling request (SR) in the slot;

in response to the PDSCH being correctly received, transmit a first signal corresponding to the positive SR in a first resource configured specifically for the UE for transmitting a positive SR in the slot; and

in response to the PDSCH being incorrectly received, transmit a second signal indicating negative ACK (NACK) feedback corresponding to the PDSCH in the first resource in the slot, wherein the second signal is different from the first signal.
The UE of claim 8, wherein the first signal is a first sequence and the second signal is a second sequence.
The UE of claim 9, wherein the first sequence is determined based on a cyclic shift parameter and the second sequence is determined based on a cyclic shift parameter and an offset value.
The UE of claim 8, wherein the first signal corresponds to a first bit and the first bit is modulated according to a first modulation method.
The UE of claim 8, wherein the second signal corresponds to a second bit and the second bit is modulated according to a first modulation method; or

wherein the second signal corresponds to two bits and the two bits are modulated according to a second modulation method.
A base station (BS) , comprising:

a transceiver; and

a processor coupled to the transceiver, wherein the processor is configured to:

transmit a physical downlink shared channel (PDSCH) to a group of user equipment (UEs) , wherein hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the PDSCH is indicated to be transmitted in a slot; and

at least one of the following:

in response to receiving, from a UE of the group of UEs, a first signal corresponding to a positive scheduling request (SR) in a first resource configured specifically for the UE for transmitting a positive SR in the slot, determine that the PDSCH is correctly received by the UE and a positive SR is transmitted by the UE; or

in response to receiving, from the UE of the group of UEs, a second signal indicating negative ACK (NACK) feedback corresponding to the PDSCH in the first resource in the slot, determine that the PDSCH is incorrectly received by the UE and a positive SR is transmitted by the UE, wherein the second signal is different from the first signal.
The BS of claim 13, wherein the first signal is a first sequence and the second signal is a second sequence.
The BS of claim 13, wherein the first signal corresponds to a first bit and the second signal corresponds to a second bit or two bits.