WO2023077435A1 - Procédé et appareil de multiplexage de sr avec rétroaction harq-ack pour une transmission de multidiffusion - Google Patents

Procédé et appareil de multiplexage de sr avec rétroaction harq-ack pour une transmission de multidiffusion Download PDF

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Publication number
WO2023077435A1
WO2023077435A1 PCT/CN2021/129023 CN2021129023W WO2023077435A1 WO 2023077435 A1 WO2023077435 A1 WO 2023077435A1 CN 2021129023 W CN2021129023 W CN 2021129023W WO 2023077435 A1 WO2023077435 A1 WO 2023077435A1
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pdsch
sequence
resource
slot
nack
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PCT/CN2021/129023
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English (en)
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Haipeng Lei
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Lenovo (Beijing) Limited
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Priority to PCT/CN2021/129023 priority Critical patent/WO2023077435A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint

Definitions

  • 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.
  • SR scheduling request
  • HARQ-ACK hybrid automatic repeat request acknowledgement
  • 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.
  • 4G systems such as long term evolution (LTE) systems, LTE-advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may also be referred to as new radio (NR) systems.
  • a wireless communication system may support multicast and broadcast services (MBSs) .
  • MBSs multicast and broadcast services
  • 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) .
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • 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) .
  • UCI uplink control information
  • SR scheduling request
  • a UE may transmit a scheduling request (SR) to a BS for requesting an uplink resource.
  • 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.
  • PDSCH physical downlink shared channel
  • NACK negative acknowledgement
  • SR negative scheduling request
  • 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.
  • PDSCH physical downlink shared channel
  • HARQ-ACK hybrid automatic repeat request acknowledgement
  • 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.
  • SR negative scheduling request
  • NACK negative acknowledgement
  • 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
  • SR positive scheduling request
  • 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.
  • PDSCH physical downlink shared channel
  • NACK negative acknowledgement
  • SR negative scheduling request
  • 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.
  • PDSCH physical downlink shared channel
  • HARQ-ACK hybrid automatic repeat request acknowledgement
  • 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.
  • SR negative scheduling request
  • NACK negative acknowledgement
  • 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
  • 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.
  • 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.
  • FIG. 6 illustrates a block diagram of an exemplary apparatus in accordance with some embodiments 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.
  • 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.
  • 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.
  • 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.
  • UL uplink
  • the BS 102 may be distributed over a geographic region.
  • 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.
  • DL downlink
  • the wireless communication system 100 may be compatible with any type of network that is capable of sending and receiving wireless communication signals.
  • 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.
  • TDMA time division multiple access
  • CDMA code division multiple access
  • OFDMA orthogonal frequency division multiple access
  • the wireless communication system 100 is compatible with 5G NR of the 3GPP protocol.
  • 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.
  • DFT-S-OFDM discrete Fourier transform-spread-orthogonal frequency division multiplexing
  • CP-OFDM cyclic prefix-OFDM
  • the wireless communication system 100 may implement some other open or proprietary communication protocols, for example, WiMAX, among other protocols.
  • 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.
  • the wireless communication system 100 may support multicast and broadcast services (MBSs) .
  • MBSs multicast and broadcast services
  • one or more UEs e.g., UE 101a and UE 101b
  • MBSs e.g., an MBS PDSCH
  • 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.
  • PTP point-to-point
  • PTM point-to-multipoint
  • PTM point-to-multipoint
  • the definitions of these schemes are specified in 3GPP specifications.
  • a group-common radio network temporary identifier (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.
  • 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.
  • a UE-specific RNTI e.g., cell-RNTI (C-RNTI)
  • C-RNTI cell-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.
  • 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.
  • QoS requirement e.g., reliability.
  • a UE does not transmit an acknowledgement (ACK) to the BS when a PDSCH is successfully received.
  • ACK acknowledgement
  • the UE transmits a negative ACK (NACK) to the BS when the PDSCH is not successfully received.
  • NACK negative ACK
  • a group of UEs share the same resource to transmit respective NACK (s) , if any.
  • 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.
  • 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.
  • a UE e.g., UE 101a or UE 101b
  • an SR e.g., a positive SR as defined in 3GPP specifications
  • 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.
  • each SR configuration may be associated with a corresponding traffic type or service.
  • an SR configuration may include an SR PUCCH format and resource, a periodicity and an offset within the periodicity.
  • two PUCCH formats may be used to transmit an SR (e.g., a positive SR) .
  • 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 ⁇ , different sequences can be generated.
  • the cyclic shift ⁇ may be computed based on, among others, an initial cyclic shift (e.g., m 0 ) and a cyclic shift parameter (e.g., m CS ) .
  • a sequence x (n) for a positive SR transmission using PUCCH format #0 can be generated according to:
  • cyclic shift ⁇ may vary as a function of the symbol and slot number according to
  • the UE may transmit HARQ-ACK feedback corresponding to a PDSCH transmission through a PUCCH.
  • the UE may determines values m 0 and m CS for computing a value of the cyclic shift ⁇ , 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
  • Table 2 Mapping of values for two HARQ-ACK information bits to sequences for PUCCH format #0
  • 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.
  • 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 ⁇ , 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.
  • 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
  • Table 4 Mapping of values for two HARQ-ACK information bits and positive SR to sequences for PUCCH format #0
  • the UE 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.
  • MBS may support the NACK-only based HARQ-ACK feedback.
  • 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.
  • 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.
  • 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.
  • 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 ⁇ .
  • j may be an integer value within the range of [0, 11] .
  • j 0 when only positive SR is transmitted.
  • 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.
  • 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.
  • the UE may determine the values of m 0 and m CS for computing the value of cyclic shift ⁇ .
  • m 0 may be provided by a higher layer parameter initialcyclicshift of PUCCH-format0
  • k may be a predefined integer value within the range of [0, 11] .
  • k 0 when negative SR and NACK-only based HARQ-ACK feedback are multiplexed.
  • 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.
  • 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” ) .
  • 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) .
  • 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.
  • the UE may determine the values of m 0 and m CS for computing a value of cyclic shift ⁇ .
  • m 0 may be provided by a higher layer parameter initialcyclicshift of PUCCH-format0
  • the value of m CS may be determined based at least on a value specific to the UE (denoted as “X” ) .
  • 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.
  • 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
  • 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.
  • 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.
  • 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 ⁇ .
  • j 1 may be an integer value within the range of [0, 11] .
  • j 1 0 when only positive SR is transmitted.
  • 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 ⁇ .
  • i may be predefined in a standard (s) .
  • i can be set to 6, 4, 3, 2, 1, or other values.
  • 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 ⁇ .
  • k 1 may be an integer value within the range of [0, 11] .
  • k 1 0 in the case that the negative SR and NACK-only based HARQ-ACK feedback are multiplexed.
  • Table 6 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.
  • 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” ) .
  • 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 ⁇ .
  • j 2 may be an integer value within the range of [0, 11] .
  • j 2 0 when only positive SR is transmitted.
  • 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 ⁇ .
  • 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) .
  • k 2 may be an integer value within the range of [0, 11] .
  • k 2 0 in the case that the negative SR and NACK-only based HARQ-ACK feedback are multiplexed.
  • 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 ⁇ .
  • i 2 may be predefined in a standard (s) .
  • i 2 can be set to 6, 4, 3, 2, 1, or other values.
  • Table 7 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
  • 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.
  • value #A a predefined value
  • BPSK binary phase shift keying
  • the UE transmits 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 #B” ) different from value #A.
  • 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.
  • QPSK quadrature phase shift keying
  • 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.
  • 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.
  • the UE may transmit the NACK-only based feedback in the PUCCH resource reserved for NACK-only based HARQ-ACK feedback.
  • 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.
  • the procedure may be performed by a UE, for example, UE 101 in FIG. 1.
  • a UE may receive a PDSCH, wherein the PDSCH may be common to a group of UEs including the UE.
  • the UE may determine to transmit a NACK feedback corresponding to the PDSCH in a 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.
  • the UE in response to determining to transmit a positive SR in the slot, 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the procedure may be performed by a UE, for example, UE 101 in FIG. 1.
  • 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.
  • the UE may determine to transmit a positive SR in the slot.
  • 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.
  • 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.
  • NACK negative ACK
  • 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.
  • the first signal may correspond to a first bit and the first bit may be modulated according to a first modulation method.
  • the second signal may correspond to a second bit and the second bit may be modulated according to the first modulation method.
  • the second signal may correspond to two bits and the two bits may be modulated according to a second modulation method.
  • 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.
  • the procedure may be performed by a BS, for example, BS 102 in FIG. 1.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the procedure may be performed by a BS, for example, BS 102 in FIG. 1.
  • 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.
  • 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.
  • 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.
  • the first signal may correspond to a first bit and the first bit may be modulated according to a first modulation method.
  • the second signal may correspond to a second bit and the second bit may be modulated according to the first modulation method.
  • the second signal may correspond to two bits and the two bits may be modulated according to a second modulation method.
  • 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.
  • 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.
  • the transceiver 602 may be divided into two devices, such as a receiving circuitry and a transmitting circuitry.
  • the apparatus 600 may further include an input device, a memory, and/or other components.
  • 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.
  • 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.
  • the apparatus 600 may further include at least one non-transitory computer-readable medium.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Des modes de réalisation de la présente invention concernent le multiplexage d'une demande de planification (SR) avec une rétroaction de demande de répétition automatique hybride (HARQ-ACK) pour un service de multidiffusion. Selon certains modes de réalisation de l'invention, un procédé exécuté par un équipement utilisateur (UE) peut comprendre : la réception d'un canal physique partagé de liaison descendante (PDSCH), le PDSCH étant commun à un groupe d'UE comprenant l'UE ; la détermination de la transmission d'une rétroaction d'accusé de réception négatif (NACK) correspondant au PDSCH dans un créneau ; en réponse à la détermination de la transmission d'un SR négatif dans le créneau, la transmission d'une première séquence dans une première ressource dans le créneau ; et en réponse à la détermination de la transmission d'un SR positif dans le créneau, la transmission d'une deuxième séquence dans une deuxième ressource dans le créneau.
PCT/CN2021/129023 2021-11-05 2021-11-05 Procédé et appareil de multiplexage de sr avec rétroaction harq-ack pour une transmission de multidiffusion WO2023077435A1 (fr)

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