CN113228542A - Apparatus and method for supporting a feedback mechanism - Google Patents

Apparatus and method for supporting a feedback mechanism Download PDF

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Publication number
CN113228542A
CN113228542A CN201880100377.0A CN201880100377A CN113228542A CN 113228542 A CN113228542 A CN 113228542A CN 201880100377 A CN201880100377 A CN 201880100377A CN 113228542 A CN113228542 A CN 113228542A
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feedback
group
specific
signaling
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CN113228542B (en
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栗忠峰
理查德·斯特林-加拉赫
罗健
周冁
塞尔绀·阿亚兹
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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

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  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a network device for supporting a User Equipment (UE) feedback mechanism for unicast or multicast or broadcast transmissions. The network device is configured to: determining one or more of feedback channel resources for one UE or a subgroup or group of UEs, wherein each determined feedback channel resource is a UE-specific feedback channel resource or a shared feedback channel resource for one UE or a group or subgroup of UEs; and transmitting UE-specific signaling or subgroup-specific signaling or group-specific signaling to the UE or a subgroup or group of UEs, the UE-specific signaling or subgroup-specific signaling or group-specific signaling comprising one or more parameters indicating at least one of the determined feedback channel resources. The invention also provides a wireless communication device (UE). The wireless communication device is configured to: receiving UE-specific signaling or sub-group-specific signaling from a network device, the UE-specific signaling or sub-group-specific signaling comprising one or more resource parameters indicating at least one determined feedback channel resource; and transmitting one or more feedback messages to the network device and/or a further node using the at least one determined feedback channel resource, wherein the at least one determined feedback channel resource is a UE-specific feedback channel resource or a shared feedback channel resource for the subgroup of UEs.

Description

Apparatus and method for supporting a feedback mechanism
Technical Field
The present invention relates generally to the field of wireless communications, and more particularly to the field of supporting feedback mechanisms for transmissions such as unicast, multicast, broadcast, multicast, and the like. To this end, the invention proposes a network device configured to determine feedback channel resources and to send, for example, signaling to a UE comprising a parameter indicative of the determined feedback channel resources. The invention also proposes a wireless communication device which receives the signaling and sends the feedback message, e.g. in the determined feedback channel resource.
Background
In general, there is a need to be able to implement Vehicle to evolution (V2X) (e.g., Vehicle to Vehicle, Vehicle to infrastructure, Vehicle to network, Vehicle to pedestrian, etc.) or cellular intelligent transportation system (C-ITS) communication systems to support an ever-increasing demand for, for example, Vehicle safety, traffic management, different levels of assistance with autopilot, etc.
In order to provide such a functional service, the following technical problems need to be solved:
there is a need to improve the reliability and efficiency of SL multicast and/or unicast transmissions, for example by providing a Sidelink (SL) feedback mechanism. In other words, a mechanism for providing feedback for SL multicast and/or unicast is needed.
There is also a need to optimize conventional feedback mechanisms, for example to further improve SL multicast and/or unicast performance, including overhead for feedback, latency for feedback, reliability of feedback.
Conventional apparatus and methods are known to provide multicast transmission, such as Long Term Evolution (LTE) V2X (described in the TS 36.321 document). However, the provided multicast transmission does not support a feedback mechanism, and conventional devices and methods in LTE V2X provide up to two transmissions including blind retransmissions for enhanced coverage or reliability. The conventional apparatus and method have the following disadvantages:
feedback mechanisms are not supported.
Typically a conservative Modulation and Coding Scheme (MCS) is used.
Inefficient, e.g., providing up to one blind retransmission.
Further, conventional apparatuses and methods are also known that provide a broadcast or multicast feedback mechanism, for example, using a shared channel that carries only Negative Acknowledgement (NACK) information. However, shared channel Hybrid Automatic Repeat Request (HARQ) NACK feedback may result in high received NACK power, which has the following disadvantages:
the large power imbalance is not favorable for Automatic Gain Control (AGC) adjustment of the receiver.
Interference control for other receiving nodes or receiving neighbor nodes is not facilitated, and moreover, interference may fluctuate due to an uncertain number of received NACK feedbacks.
It is not advantageous to distinguish the decoding results of each receiving User Equipment (UE).
Disclosure of Invention
In view of the foregoing problems and disadvantages, the present invention is directed to improving conventional apparatuses and methods for supporting a User Equipment (UE) feedback mechanism. In particular, it is an object to provide a network device, a wireless communication device and corresponding methods for supporting a UE feedback mechanism for unicast, multicast or broadcast transmissions.
The object of the invention is achieved by the solution presented in the appended independent claims. Advantageous implementations of the invention are further defined in the dependent claims.
A first aspect of the present invention provides a network device for supporting a user equipment, UE, feedback mechanism for unicast or multicast or broadcast transmissions, the network device being configured to: determining one or more of feedback channel resources for one UE or a subgroup or group of the UEs, wherein each determined feedback channel resource is a UE-specific feedback channel resource or a shared feedback channel resource for one UE or the group or subgroup of the UEs; and transmitting UE-specific signaling or subgroup-specific signaling or group-specific signaling to the UE or a subgroup or group of the UE, the UE-specific signaling or subgroup-specific signaling or group-specific signaling comprising one or more parameters indicating at least one of the determined feedback channel resources.
The network device may be a device such as a transmitter device, a Relay device, a scheduling device, a UE, a next generation NodeB (gNB), a Road Side Unit (RSU), a Relay Node (RN), and the like. The network device may also be a device that supports out-of-coverage UEs and the like.
For example, the feedback resources may be feedback channel resources. Furthermore, in some embodiments, UE-specific feedback resources may be supported for both unicast and multicast transmissions. In some embodiments, UE-shared feedback channel resources (hereinafter also referred to as common feedback channel resources) may be supported for multicast transmissions. Further, in some embodiments, both the UE-specific feedback channel resources for unicast or multicast transmissions and the UE-common feedback resources for multicast transmissions may support direct feedback or relayed feedback (e.g., via a relay device) to the destination device.
In an implementation form of the first aspect, the network device is further configured to determine a correspondence between a group Identification (ID) and/or a subgroup ID and one or more of:
UE index.
UE identity.
Feedback index.
In another implementation form of the first aspect, the UE-specific signaling or the sub-group-specific signaling or the group-specific signaling is sent based on the determined correspondence.
This is advantageous because the correspondence can be determined. Further, a signal may be transmitted based on the determined correspondence, which may be UE-specific signaling, or sub-group-specific signaling or group-specific signaling.
In another implementation form of the first aspect, each determined feedback channel resource is configured to support one or more of:
feedback to the destination device.
Relay feedback to the destination device via the relay device.
This is advantageous because feedback messages can be sent.
In another implementation form of the first aspect, the UE-specific signaling and/or the group-specific signaling and/or the subgroup-specific signaling comprises one or more of:
higher layer signaling indicating group-specific or sub-group-specific feedback channel parameters; and/or
Lower layer signaling indicating a group-specific or subgroup-specific feedback channel resource indication value; and/or
Higher layer signaling indicating an association between a UE ID or UE index and a group ID or sub-group ID; and/or
Higher layer signaling indicating an association between the UE ID or UE index and a feedback index carried in the group or subgroup specific lower layer signaling.
This is beneficial because it can be determined which UE has decoded correctly and/or which UE has not decoded correctly, etc.
In another implementation form of the first aspect, the network device is further configured to multiplex the two or more feedback channel resources based on time sequencing and/or frequency sequencing and/or code sequencing.
This is beneficial because efficient feedback channel resource multiplexing between different UEs can be supported.
In another implementation form of the first aspect, the network device is further configured to receive one or more feedback messages from one or more of the UEs, wherein the feedback message for each UE is received in the determined UE-specific feedback channel resource or the determined shared feedback channel resource.
In another implementation form of the first aspect, the received feedback message comprises a negative acknowledgement, NACK, and/or an Acknowledgement (ACK).
For the aggregated embodiment, the gNB may receive relayed ACKs or NACKs after, for example, processing by the relay UE, NACK only when there is at least one NACK, and ACK only when all received are ACKs.
For a cascaded embodiment, the gNB may receive both ACKs and NACKs, which may be supported, for example.
In another implementation form of the first aspect, each feedback channel resource is determined by one or more of:
a starting position of a Physical Downlink Control Channel (PDCCH).
The starting position of the Physical Sidelink Control Channel (PSCCH).
The starting position of the control channel.
Resource pool configuration for data channels.
Resource pool configuration for feedback channels and/or control channels.
Predefined or configured associations between data channels and/or control channels and the pool of feedback channel resources.
A group-specific Downlink Control Information (DCI) indication value.
A group-specific Sidelink Control Information (SCI) indication value.
Group specific Radio Resource Control (RRC) and/or MAC Control Element (MAC CE).
Indicate feedback resource parameters.
Group specific higher layer signaling indicates feedback resource parameters.
UE index.
Offset k or a group specific higher layer signaling indication value.
Feedback index.
The group ID.
The subgroup ID.
Sequence type.
Cyclic shift values.
OCC index.
The scrambling code ID.
Unicast or multicast or both unicast and multicast transmission types.
A second aspect of the present invention provides a method for supporting a user equipment, UE, feedback mechanism for unicast or multicast or broadcast transmissions, the method comprising: determining one or more of feedback channel resources for one UE or a subgroup or group of UEs, wherein each determined feedback channel resource is a UE-specific feedback channel resource or a shared feedback channel resource for one UE or the group or subgroup of UEs; and transmitting UE-specific signaling or subgroup-specific signaling or group-specific signaling to the UE or a subgroup or group of the UE, the UE-specific signaling or subgroup-specific signaling or group-specific signaling comprising one or more parameters indicating at least one of the determined feedback channel resources.
In an implementation form of the second aspect, the method further comprises determining a correspondence between a group Identification (ID) and/or a subgroup ID and one or more of:
UE index.
UE identity.
Feedback index.
In another implementation form of the second aspect, the UE-specific or sub-group-specific or group-specific signaling is sent based on the determined correspondence.
In another implementation form of the second aspect, each determined feedback channel resource is configured to support one or more of:
feedback to the destination device.
Relay feedback to the destination device via the relay device.
In another implementation form of the second aspect, the UE-specific signaling and/or the group-specific signaling and/or the subgroup-specific signaling comprises one or more of:
higher layer signaling indicating group-specific or sub-group-specific feedback channel parameters; and/or
Lower layer signaling indicating a group-specific or subgroup-specific feedback channel resource indication value; and/or
Higher layer signaling indicating an association between a UE ID or UE index and a group ID or sub-group ID; and/or
Higher layer signaling indicating an association between the UE ID or UE index and a feedback index carried in the group or subgroup specific lower layer signaling.
In another implementation form of the second aspect, the method further comprises multiplexing two or more feedback channel resources based on time sequencing and/or frequency sequencing and/or code sequencing.
In another implementation form of the second aspect, the method further comprises receiving one or more feedback messages from one or more of the UEs, wherein the feedback message for each UE is received in the determined UE-specific feedback channel resource or the determined shared feedback channel resource.
In another implementation form of the second aspect, the received feedback message comprises a negative acknowledgement, NACK, and/or an acknowledgement, ACK.
In another implementation form of the second aspect, each feedback channel resource is determined by one or more of:
the starting position of the physical downlink control channel PDCCH.
The starting position of the physical sidelink control channel PSCCH.
The starting position of the control channel.
Resource pool configuration for data channels.
Resource pool configuration for feedback channels and/or control channels.
Predefined or configured associations between data channels and/or control channels and the pool of feedback channel resources.
Group specific downlink control information, DCI, indication value.
The group-specific sidelink control information SCI indication value.
Group specific radio resource control RRC and/or MAC control element MAC CE.
Indicate feedback resource parameters.
Group specific higher layer signaling indicates feedback resource parameters.
UE index.
Offset k or a group specific higher layer signaling indication value.
Feedback index.
The group ID.
The subgroup ID.
Sequence type.
Cyclic shift values.
OCC index.
The scrambling code ID.
Unicast or multicast or both unicast and multicast transmission types.
A third aspect of the present invention provides a wireless communication device, UE, configured to receive UE-specific signaling or sub-group-specific signaling from a network device, the UE-specific signaling or sub-group-specific signaling comprising one or more parameters indicative of at least one determined feedback channel resource; and transmitting one or more feedback messages to the network device and/or a further node using the at least one determined feedback channel resource, wherein the at least one determined feedback channel resource is a UE-specific feedback channel resource or a shared feedback channel resource for a group or subgroup of UEs.
For example, a network device (e.g., a gNB, UE, RSU, RN, etc.) may determine feedback channel resources. Further, the wireless communication device (e.g., UE) may transmit a feedback message to the network device and/or another node using the determined feedback channel resources. This is beneficial because a feedback mechanism can be supported.
In an implementation form of the third aspect, the UE-specific signaling or the sub-group-specific signaling or the group-specific signaling indicates a correspondence between the group identification ID and one or more of:
UE index.
UE identity.
Feedback index.
In another implementation form of the third aspect, the transmitted feedback message comprises a negative acknowledgement, NACK, and/or an acknowledgement, ACK.
In another implementation form of the third aspect, each feedback channel resource is determined by one or more of:
the starting position of the physical downlink control channel PDCCH.
The starting position of the physical sidelink control channel PSCCH.
The starting position of the control channel.
Resource pool configuration for data channels.
Resource pool configuration for feedback channels and/or control channels.
Predefined or configured associations between data channels and/or control channels and the pool of feedback channel resources.
A group downlink control information, DCI, indication value.
The group sidelink control information SCI indicates a value.
Group specific radio resource control RRC and/or MAC control element MAC CE.
Indicate feedback resource parameters.
Group specific higher layer signaling indicates feedback resource parameters.
UE index.
Offset k or a group specific higher layer signaling indication value.
Feedback index.
The group ID.
The subgroup ID.
Sequence type.
Cyclic shift values.
OCC index.
The scrambling code ID.
Unicast or multicast or both unicast and multicast transmission types.
In another implementation form of the third aspect, the wireless communication device is further configured to, when acting as a relay UE, send an aggregated hybrid automatic repeat request, HARQ, feedback message to the further node, wherein the aggregated HARQ feedback message comprises a NACK if at least one feedback message is a NACK or an ACK when all received feedback is an ACK.
For example, unicast may also use relay UEs, e.g., several devices communicate using unicast (e.g., C → B → a), which may not be defined as a group at times. Also, without limiting the present invention, it may be supported for a group, a sub-group, one UE, etc.
In another implementation form of the third aspect, the wireless communication device is further configured to, when acting as a relay UE, transmit a concatenated HARQ feedback message to the further node, wherein the concatenated HARQ feedback message comprises one or more feedback messages received from the UE or the group of UEs or the sub-group of UEs.
For example, unicast may also use relay UEs, e.g., several devices communicate using unicast (e.g., C → B → a), which may not be defined as a group at times. Also, without limiting the present invention, it may be supported for a group, a sub-group, one UE, etc.
In some embodiments, the relay UE may be a dominant UE or a configured UE without limiting the invention.
A fourth aspect of the present invention provides a method of a wireless communication device, UE, the method comprising: receiving UE-specific signaling or group-specific signaling or sub-group-specific signaling from a network device, the UE-specific signaling or group-specific signaling or sub-group-specific signaling comprising one or more parameters indicating at least one determined feedback channel resource; and transmitting one or more feedback messages to the network device and/or to a further node using at least one determined feedback channel resource, wherein the at least one determined feedback channel resource is a UE-specific feedback channel resource or a shared feedback channel resource for the UE or the group of UEs or the subgroup of UEs.
In an implementation form of the fourth aspect, the UE-specific signaling or the group-specific signaling or the sub-group-specific signaling indicates a correspondence between the group identification ID and one or more of:
UE index.
UE identity.
Feedback index.
In another implementation form of the fourth aspect, the transmitted feedback message comprises a negative acknowledgement, NACK, and/or an acknowledgement, ACK.
In another implementation form of the fourth aspect, each feedback channel resource is determined by one or more of:
the starting position of the physical downlink control channel PDCCH.
The starting position of the physical sidelink control channel PSCCH.
The starting position of the control channel.
Resource pool configuration for data channels.
Resource pool configuration for feedback channels and/or control channels.
Predefined or configured associations between data channels and/or control channels and the pool of feedback channel resources.
A group downlink control information, DCI, indication value.
The group sidelink control information SCI indicates a value.
Group specific radio resource control RRC and/or MAC control element MAC CE.
Indicate feedback resource parameters.
Group specific higher layer signaling indicates feedback resource parameters.
UE index.
Offset k or a group specific higher layer signaling indication value.
Feedback index.
The group ID.
The subgroup ID.
Sequence type.
Cyclic shift values.
OCC index.
The scrambling code ID.
Unicast or multicast or both unicast and multicast transmission types.
In another implementation form of the fourth aspect, the method further comprises: when acting as a relay UE, transmitting an aggregated hybrid automatic repeat request, HARQ, feedback message to a further node, wherein the aggregated HARQ feedback message comprises a NACK if at least one feedback message is a NACK, or an ACK when all received feedbacks are ACKs.
In another implementation form of the fourth aspect, the method further comprises: when acting as a relay UE, transmitting a concatenated HARQ feedback message to a further node, wherein the concatenated HARQ feedback message comprises one or more feedback messages received from the UE or a subgroup of UEs.
The main advantages of embodiments of the present invention can be summarized as follows:
balanced received power due to UE-specific feedback channel resource configuration.
Balanced interference to other UEs or other nodes due to UE-specific feedback channel resource configuration.
Efficient feedback channel resource multiplexing between different UEs.
Support for orthogonal multiplexing with sequences and/or codes and/or time and/or frequency.
Support NACK-only feedback in UE-specific feedback channel resources.
Feedback to support aggregation or concatenation.
Determine (e.g., exactly) which UE did not decode correctly.
May be determined by UE-specific retransmission and/or by UE-specific beamforming.
It has to be noted that all devices, elements, units and means described in the present application may be implemented as software or hardware elements or any type of combination thereof. All steps performed by the various entities described in the present application, as well as the functions described as being performed by the various entities, are intended to mean that the respective entities are adapted or configured to perform the respective steps and functions. Although in the following description of certain embodiments certain functions or steps to be performed by an external entity are not reflected in the description of certain detailed elements of the entity performing the certain steps or functions, it should be clear to a skilled person that these methods and functions may be implemented in corresponding software or hardware elements or any kind of combination thereof.
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The above aspects and implementations of the invention will be explained in the following description of specific embodiments with reference to the drawings, in which:
fig. 1 schematically illustrates a network device for supporting a UE feedback mechanism, in accordance with various embodiments of the present invention;
FIG. 2 schematically illustrates a process for supporting a feedback mechanism for unicast and/or multicast transmissions, in accordance with various embodiments of the present invention;
FIG. 3 schematically illustrates a process for determining correspondences and supporting a feedback mechanism by a network device, in accordance with various embodiments of the invention;
fig. 4 schematically illustrates a process for obtaining correspondence by a wireless communication device and supporting a feedback mechanism, in accordance with various embodiments of the present invention;
FIG. 5 schematically illustrates a system for supporting a feedback mechanism for multicast transmissions, in accordance with various embodiments of the invention;
FIG. 6 schematically illustrates a process for supporting a feedback mechanism by a network device, in accordance with various embodiments of the invention;
FIG. 7 schematically illustrates a process for supporting a feedback mechanism from one side of a wireless communication device, in accordance with various embodiments of the present invention;
FIG. 8 schematically illustrates a system for supporting subgroup-based shared feedback channel resources according to various embodiments of the present invention;
fig. 9 schematically illustrates a method for supporting a UE feedback mechanism for unicast or multicast or broadcast transmissions, in accordance with various embodiments of the present invention;
fig. 10 schematically illustrates a method of a wireless communication device according to various embodiments of the present invention.
Detailed Description
Fig. 1 schematically illustrates a network device 100 for supporting a UE feedback mechanism according to various embodiments of the present invention.
A feedback mechanism may be supported for unicast or multicast or broadcast transmissions.
The network device 100 is configured to determine one or more of the feedback channel resources 101 for one UE 110 or a subgroup or group of UEs 110, wherein each determined feedback channel resource 101 is a UE-specific feedback channel resource or a shared feedback channel resource for one UE 110 or a group or subgroup of UEs 110.
The network device 100 is further configured to send UE-specific signaling or subgroup-specific signaling or group-specific signaling 102 to the UE 110 or a subgroup or group of UEs 110, the UE-specific signaling or subgroup-specific signaling or group-specific signaling 102 comprising one or more parameters 103 indicative of at least one of the determined feedback channel resources 101.
For example, in some embodiments, UE-specific feedback channel resources for multicast transmission in SL or Uu links may be determined. Group specific higher layer signaling may be used, which may include one or more HARQ feedback resource configuration parameters. Further, a correspondence between the UE index and the group ID may be configured, and the UE index may be associated with the feedback resource. Feedback resources may be determined and feedback mechanisms may be supported. Further, a UE may be configured to receive and/or transmit messages for one and/or more than one UE. In response, the UE may determine the feedback resources according to the group-specific parameters and/or the UE-specific parameters.
Fig. 2 schematically illustrates a process 200 for supporting a feedback mechanism for unicast transmissions and/or multicast transmissions, in accordance with various embodiments of the present invention.
As described above, process 200 may be performed (e.g., in whole or in part) by network device 100 and/or wireless communication device 110.
At 201, a network device initiates a support feedback mechanism. Feedback mechanisms may be supported for unicast delivery and/or multicast delivery.
For example, in some embodiments, a network device may support UE-specific feedback channel resources for both unicast and multicast transmissions. Furthermore, in some embodiments, the network device may support UE common or shared feedback channel resources for multicast transmissions.
At 202, the network device determines feedback resources.
At 203, a feedback message may be transmitted using the determined feedback channel resources. For example, both UE-specific feedback channel resources for unicast or multicast and UE-shared feedback channel resources for multicast may support direct feedback and/or relayed feedback (e.g., via a relay device) to a destination device.
In some embodiments, for example, the network device may determine the UE-specific (e.g., device-specific) HARQ feedback resources based on group-specific and/or device-specific signaling for the transmitter device and/or the relay device and/or the scheduling device. The transmitter device, relay device, scheduling device may be, for example, a UE, a gNB, a Road Side Unit (RSU), a Relay Node (RN), etc.
In some embodiments, UE-specific signaling for multicast Feedback Physical Uplink Control Channel (FB PUCCH) resources or multicast Physical side Uplink Feedback Channel (PSFCH) may be transmitted. For example, the UE-specific signaling may indicate one or more of a multicast HARQ feedback resource configuration parameter, a PUCCH resource parameter, a sidelink feedback resource parameter. These parameters may include, for example, sequence type, base sequence, pseudo random (PN) sequence, cyclic shift, orthogonal cover code, scrambling code ID, time, frequency, UE ID, UE index, group ID, and the like. For example, UE-specific signaling may only indicate or reuse unicast symbol number configuration for multicast. In addition, a group identity, e.g., a group Radio Network Temporary Identifier (RNTI), may be included in the UE-specific signaling so that the UE may use the UE-specific configuration for the multicast transmission, or it may identify the multicast transmission.
In some embodiments, a correspondence between a UE index and/or UE ID and/or feedback index correspondence and a group identification and/or subgroup identification may be determined.
For example, to support UE-specific feedback resource configuration, the correspondence of UE indices and/or UE IDs and/or feedback indices to group or subgroup identifications may be defined, configured, etc.
In some embodiments, the UE specific signaling may indicate a correspondence of the UE index and/or UE ID and/or feedback index to the group or subgroup. In some embodiments, the group specific signaling may indicate a correspondence between UE indices and/or UE IDs and/or feedback indices and group IDs for UEs within a group or sub-group.
In the following, exemplary procedures from the transmitter side and the receiver side for determining a correspondence between a UE ID and/or a UE index and/or a feedback index and a group or sub-group ID are shown.
In some embodiments, UE-specific signaling may be used, and further, the UE index and/or feedback index and the group ID may be configured. In some embodiments, group specific signaling may be used, and further, the UE ID and/or UE index and/or feedback index and the group ID may be configured. UE-specific signaling may have the benefit of being more flexible than group-specific signaling. Since the group ID is shared between UEs, the group-specific signaling may have less overhead than the UE-specific signaling. As an alternative method, a feedback index may be used to indicate the bit position of the corresponding UE in the multicast feedback resource indication. For example, it may be supported by defining group-specific control information.
Fig. 3 schematically illustrates a process 300 for determining correspondences and supporting a feedback mechanism by a network device, in accordance with various embodiments of the invention.
At 301, device a (e.g., network device 100) initiates determining (e.g., configuring) a correspondence between a UE ID or UE index or feedback index and a UE group identity, e.g., group RNTI.
At 302, in some embodiments, device a (e.g., network device 100) itself may configure a correspondence between a UE ID or UE index or feedback index of, for example, UE B (i.e., another UE) and a group ID. In some embodiments, device a may configure the correspondence between the UE ID or UE index or feedback index of UE B and the group ID through device C.
At 303, in some embodiments, device a (e.g., network device 100) may configure (e.g., determine) one correspondence or more than one correspondence between a UE ID or UE index or feedback index and a group ID. In some embodiments, device C (another device than device a) may configure (e.g., determine) one correspondence between a UE ID or UE index or feedback index and a group ID or more than one correspondence between a UE ID or UE index or feedback index and a group ID.
At 304, UE-specific signaling or group-specific signaling may be used, e.g., the network device may send the signaling.
Fig. 4 schematically illustrates a process 400 for obtaining correspondence and supporting a feedback mechanism by a wireless communication device, in accordance with various embodiments of the present invention.
At 401, device B (e.g., wireless communication device 110) may receive signaling indicating a correspondence between a UE ID or UE index or feedback index and a UE group identity, e.g., group RNTI.
At 402, in some embodiments, device B (e.g., wireless communication device 110) may itself receive signaling indicating a correspondence between UE ID or UE index or feedback index of UE B and group ID. In some embodiments, device B may receive signaling indicating a correspondence between a UE ID or UE index or feedback index of UE B and a group ID through device C.
At 403, in some embodiments, device B may receive a configuration of one correspondence between a UE ID or UE index or feedback index and a group ID or more than one correspondence between a UE ID or UE index or feedback index and a group ID.
In some embodiments, device B may receive signaling from device C indicating one correspondence between a UE ID or UE index or feedback index and a group ID or more than one correspondence between a UE ID or UE index or feedback index and a group ID.
At 404, UE-specific signaling or group-specific signaling may be used.
In some embodiments, there may be one or more subgroups. Different subgroups may share the same group RNTI (e.g., receive the same group RNTI scrambled control channel), but have, for example, different feedback configurations or different sidelink feedback channel resource configurations or different PUCCH configurations.
For example, the different configurations may be different transmission formats, and the different transmission formats may use: (ii) a different sequence; different orthogonal codes, including cyclic shifts and/or orthogonal cover codes; different sequence applications, e.g. using the gold sequence as scrambling code for the payload or using the modulated payload sequence or using the payload status to select the sequence, different number of symbols, etc. The different configurations may also be different or independent HARQ feedback timing configurations for different subgroups of UEs.
For example, a HARQ feedback relay or forwarding UE may have its own HARQ feedback timing and/or feedback format configuration when relaying or forwarding its aggregated or concatenated HARQ feedback from its subgroup of UEs. The different configurations may also be, for example, some UEs are configured to provide HARQ feedback, some do not, or some are configured to feed back only NACKs, or some are configured to feed back both ACKs and NACKs.
In some embodiments, for example, feedback channel resources may be multiplexed to reduce the feedback overhead of multicast or unicast in Uu link and/or sidelink transmissions, feedback resources or PUCCH resources or feedback channels from different UEs may be multiplexed together. To further reduce feedback resource overhead, NACK-only feedback (e.g., shared channel feedback described in solution 2) or a subgroup or subset of a group of UEs may be configured or supported for UE-specific feedback channel resource configuration.
In some embodiments, to reduce the feedback overhead of multicast or unicast in Uu link and/or sidelink transmissions, feedback resources or PUCCH or sidelink feedback channels from different UEs may be multiplexed together, e.g., by sequences in the same time and frequency resources, rather than sequences each having its own time and frequency resources. The sequence may be or may include, for example, one or more of a sequence type, a base sequence, a pseudo-random sequence, a cyclic shift, an orthogonal cover code, a scrambling code ID, and the like.
In some embodiments, the sequence may be a PN sequence with a configured or associated scrambling code ID or initialization value and/or orthogonal cover code.
In some embodiments, the sequence may be a low PAPR sequence with a base sequence and configured or associated cyclic shifts and/or orthogonal cover codes and/or scrambling code IDs, etc. Note that the scrambling code ID may also be used to create a cyclic shift or orthogonal cover code. In some embodiments, a base sequence or a PN sequence may be used. Further, there may be two schemes described as scheme 1 and scheme 2. In scheme 1, for example, a different base sequence or a different PN sequence may be used for each UE, or a UE-specific base sequence or PN sequence may be used for multicast. In scheme 2, for example, a common base sequence or a common PN sequence or a common sequence for multicast UEs may be used. Furthermore, a group specific base sequence or group specific PN sequence or group specific scrambling code ID configuration may be used.
Note that the UE-specific parameter configuration may create the UE-specific resource or sequence based on a common base sequence or a common PN sequence or a common sequence. In some embodiments, a combination of scheme 1 and scheme 2 may also be supported. For example, some UEs may share the same common sequence and some other UEs may share additional common sequences. In some embodiments, two subgroups of UEs within a group may be configured to have different sequences. Furthermore, the first subgroup and the second subgroup may have their own shared common sequence.
Scheme 1 may have worse performance than scheme 2, which may use some orthogonal codes based on common sequences, e.g., Cyclic Shift (CS) or Orthogonal Cover Code (OCC). Furthermore, for scheme 1, the number of available base sequences with good performance may be limited.
Fig. 5 schematically illustrates a system 500 for supporting a feedback mechanism for multicast transmission according to various embodiments of the invention. System 500 may be or may include network device 100 and/or wireless communication device 110.
The system 500, which may be or may include the network device 100 and/or the wireless communication device 110, may support a feedback mechanism (e.g., determine UE-specific feedback resources) for multicast transmissions.
The system may determine feedback channel resources and may further perform multiplexing 502 on the determined feedback channel resources. However, feedback channel resources such as PUCCH resource 1, PUCCH resource 2, PUCCH resource 3 may not be multiplexed 501.
Hereinafter, a procedure (e.g., procedure 600) for supporting a feedback mechanism from a sender side and a procedure (e.g., procedure 700) for supporting a feedback mechanism from a receiver side are discussed.
Fig. 6 schematically illustrates a process 600 for supporting a feedback mechanism by a network device (from the sender side) according to various embodiments of the invention.
At 601, in some embodiments, device a (e.g., network device 100) may determine multicast transmission feedback channel related parameters for one or more UEs. Further, device a may proceed to step 602.
In some embodiments, at step 601, device a may determine a correspondence between a UE ID and/or a UE index and/or a feedback index and a UE group identity, e.g., a group RNTI. Further, the apparatus may proceed to step 603.
At 602, in some embodiments, higher layer signaling may be used that may indicate common multicast transmission feedback channel parameters. In some embodiments, lower layer signaling, such as PHY signaling, may be used that may indicate a dynamic multicast transmission feedback channel resource indication value.
At 603, device a may determine UE-specific multicast transmission feedback channel resources.
At 604, device a may determine UE-specific multicast transmission feedback channel resources for the Uu link or the sidelink.
For example, a receiving UE, e.g., UE B, may identify a multicast transmission based on the indicated group ID. In addition, device a may determine the UE-specific feedback resources for the multicast transmission from the determined UE ID or the correspondence between the UE index and the group ID (e.g., determined at step 601), and also from higher layer group-specific signaling and lower layer group-specific signaling (e.g., sent at step 602). Alternatively, the receiving UE may also determine the UE-specific feedback resources for the multicast transmission, e.g., based on a mapping of the UE ID, the feedback index and the group ID, and/or based on higher layer group-specific signaling and lower layer group-specific signaling, etc.
Fig. 7 schematically illustrates a process 700 for supporting a feedback mechanism from the wireless communication device side (receiver side) according to various embodiments of the invention.
At 701, in some embodiments, device B (e.g., wireless communication device 110) may receive signaling of multicast transmission feedback channel related parameters. Further, device a may proceed to step 602. In some embodiments, at step 701, device B may receive signaling indicating a correspondence between a UE ID and/or a UE index and/or a feedback index and a UE group identity, e.g., a group RNTI. Further, the apparatus may proceed to step 603.
At 702, in some embodiments, higher layer signaling may be used that may indicate common multicast transport feedback channel parameters. In some embodiments, lower layer signaling, such as PHY signaling, may be used that may indicate a dynamic multicast transmission feedback channel resource indication value.
At 703, device B may determine UE-specific multicast transmission feedback channel resources.
At 704, device B may determine UE-specific multicast transmission feedback channel resources for the Uu link or the sidelink.
For example, the group-specific feedback resource parameters may first be indicated with group-specific signaling, which may indicate one or more of the following parameters: feedback channel format or PUCCH format, symbol configuration, starting PRB, resource pool configuration, CS, OCC, scrambling code ID, UE index, UE ID, group ID, sequence type, etc., which may be the same within a group or subgroup. The group specific signaling may be higher layer signaling, such as RRC or MAC CE, or both RRC and MAC CE. Furthermore, different sets of group-specific parameters may be configured with higher layer signaling and lower layer signaling that may indicate which set should be used. For example, when the resource pool is configured for both data and control, a predefined or configured association between the data channel and/or control channel and the feedback channel resource pool may be supported. A corresponding resource pool index may be signaled for association between the data channel and/or control channel and the feedback channel resource pool.
Furthermore, different subgroups may have different parameters or subgroup-based parameter values, e.g., subgroup 1 and subgroup 2 may have different PUCCH or sidelink feedback channel formats, symbol configurations, PRBs, resource pools, but they may share the same Downlink Control Information (DCI) or Sidelink Control Information (SCI) indication value for feedback channel resources or PUCCH resource indications.
The UE-specific feedback resources for multicast transmission in the SL or Uu link may be determined by one or more of the following schemes.
In scheme 1, one or more of a starting position of a control channel or PDCCH or Physical Sidelink Control Channel (PSCCH), a group-specific DCI indicator value or group-specific SCI indicator value, a group-specific RRC or MAC CE or both group-specific RRC and MAC CE, an indication feedback resource parameter, a UE index, etc. For group-based transmission, the UE indices may be sequentially associated with UE-specific feedback resources.
In scheme 2, one or more of a starting position of a control channel or PDCCH or Physical Sidelink Control Channel (PSCCH), a group-specific DCI indicator value or group-specific SCI indicator value, a group-specific RRC or MAC CE or both group-specific RRC and MAC CE, an indication feedback resource parameter, a UE index, an offset k (the value of k may be configured), etc. For group-based transmission, the UE indices may be sequentially associated with UE-specific feedback resources.
In scheme 3: a starting position of a control channel or PDCCH or PSCCH, a group-specific DCI indicator value or group-specific SCI indicator value, a group-specific RRC or MAC CE or both a group-specific RRC and MAC CE, an indication feedback resource parameter, one or more of a UE-specific feedback index in a group-specific DCI or group-specific SCI.
Note that for scheme 1, scheme 2, and scheme 3, for example, lower layer signaling such as PHY signaling, group-specific DCI or group-specific SCI carried by the corresponding control channel may also be transmitted, configured, received, etc. Further, the UE may determine the UE-specific feedback channel resources based on both higher layer group-specific signaling and lower layer group-specific signaling and/or UE-specific signaling.
In scheme 1, the feedback resource may be determined by one or more of a starting position of a control channel or PDCCH or PSCCH, a group DCI indicator value or group SCI indicator value, a group RRC or group MAC CE or both group RRC and group MAC CE, an indication feedback resource parameter, a UE index (UE index), etc.
Group-specific higher layer signaling, e.g., RRC, indicates feedback resource parameters including one or more of a feedback channel format, symbol configuration, PRB configuration, resource pool configuration, CS configuration, OCC configuration, scrambling code ID configuration, etc. Table 1 shows an example in which a feedback channel format, a symbol configuration, a PRB configuration, a CS configuration, an OCC configuration are configured. Note that two formats are exemplarily shown here, and other formats may also be applied. Different formats may support one or more than one of the following configurations: low PARR sequence, PN sequence, scrambling code ID, CS, OCC, symbol configuration, PRB configuration, resource pool configuration, reed miller coding, polar coordinate coding, etc. Note that the PRB configuration may be indicated in the configured resource pool.
Figure BDA0003122611300000141
Table 1: multicast HARQ feedback channel resource parameters
If the UE provides HARQ feedback information in a feedback channel or Uu or SL PUCCH transmission, the UE indexes r of SL PUCCH/Feedback (FB) channel (FB channel) resources in response to detecting the DCI or SCI formatFB channel，UE index(0≤rFB channel，UE indexN-1) is determined as
Figure BDA0003122611300000142
Wherein N isCCEIs the number of CCEs in the control resource set in the PDCCH or Sidelink Control Information (SCI) channel reception with DCI/SCI format, nCCE,0Is the index of the first CCE used for PDCCH or PSCCH reception, and ΔFBRIIs the value of Uu or SL PUCCH/feedback resource indicator field, Δ'FBRI＝ΔFBRI+ UEindex or Δ'FBRI＝ΔFBRI+ UEindex + k (k is a value that can be configured).
For multicast or broadcast transmissions, the UE specific feedback resources are based at least on group specific L1 signaling or DCI signaling or SCI signaling or MAC CE signaling and an indication value in the UE identity. Note that in general, L1 signaling is faster than MAC CE signaling, but is also more sensitive to bit overhead.
Since one PRB can only provide several cyclic shifts, when more CSs are needed, more PRBs are also needed. Thus, some UEs may be multiplexed in the same PRB using different CSs, and some UEs may be multiplexed using different PRBs using their respective CSs. Hereinafter, the procedure shows PRB index determination and CS determination.
Furthermore, Δ 'may be determined'FBRIAnd a PRB, CS mapping or implicitly determining a UE index and a PRB, CS mapping. Frequency hopping for PRB mapping may also be considered. Note that similar principles may be applied when, for example, OCC or scrambling code ID or CS or any combination thereof is configured as a feedback resource.
In some embodimentsIf, if
Figure BDA0003122611300000151
Then:
the UE may determine the PRB index of the feedback channel/Uu/SL PUCCH transmission in the first hop as
Figure BDA0003122611300000152
And determining PRB index of feedback channel/Uu/SL PUCCH transmission in second hopping as
Figure BDA0003122611300000153
Wherein N iscsIs the total number of initial cyclic shift indices in the set of cyclic shift indices.
Figure BDA0003122611300000154
Is the configured bandwidth part (BWP) or the configured RB offset (offset) in the resource pool.
Figure BDA0003122611300000155
Is the bandwidth of the BWP or resource pool.
The UE may determine a cyclic shift index in the set of cyclic shift indexes as rFB channelmod NCS。
In some embodiments, if
Figure BDA0003122611300000156
Then:
the UE may determine the PRB index of the feedback channel or PUCCH transmission in the first hop as
Figure BDA0003122611300000158
And determining a PRB index of a feedback channel or PUCCH transmission in the second hopping as
Figure BDA0003122611300000157
The UE may determine a cyclic shift index in the set of cyclic shift indexes as (r)FB channel-N/2)mod NCS。
For scheme 2 (e.g., as compared to scheme 1), a configurable resource offset is included in the feedback channel resource parameters in order to enable more flexible resource configuration. The feedback channel resources may be determined by one or more of: a starting position of PDCCH or PSCCH, a group DCI indicator value or group SCI indicator value, a group RRC or group MAC CE or both group RRC and group MAC CE, an indicator feedback resource parameter, UE index, resource offset k, etc.
Group-specific higher layer signaling, e.g., RRC, may indicate feedback resource parameters including one or more of feedback channel format, symbol configuration, PRB configuration, CS configuration, OCC configuration, scrambling code ID configuration, resource offset, sequence type. Table 2 shows an example in which a feedback channel format, a symbol configuration, a PRB configuration, a CS configuration, an OCC configuration are configured. The resource offset may also be configured additionally.
In some embodiments, Δ'PRI＝ΔPRI+ UEindex + k. Where k is a value that can be configured. Furthermore, for multicast or broadcast transmissions, the UE-specific feedback resources may be determined based on an indication value in group-specific lower layer signaling or DCI signaling or SCI signaling and an offset of the UE identity and configuration. The UE identity may be a configured UE index within a multicast or broadcast group or subgroup. The configured offset may be a group common value or a sub-group common value configured by group-specific signaling or UE-specific signaling.
In some embodiments, the OCC may also be configured with more options. As shown in table 2, in case of more than one available OCC, more feedback channel resources may be supported. For example, m available OCCs may give m r compared to only one OCC or no OCCFBchannelAnd (5) feedback resources. The number of OCCs available may be expressed as Nocc. Note that a similar principle applies when using the scrambling code ID. And may support one or a combination of more than one of CS, OCC, scrambling code ID.
In some embodiments, the UE may obtain r according to scheme 1 or scheme 2 aboveFB channel，UE index。
In some embodiments, if
Figure BDA0003122611300000161
Then:
the UE may determine the PRB index of the feedback channel/SL PUCCH transmission in the first hop as
Figure BDA0003122611300000162
And determining PRB index of feedback channel/SL PUCCH transmission in second hopping as
Figure BDA0003122611300000163
Wherein N iscsIs the total number of initial cyclic shift indices in the set of cyclic shift indices.
Figure BDA0003122611300000164
Is the configured BWP or the configured RB offset in the resource pool.
Figure BDA0003122611300000165
Is a BWP or resource pool.
The UE may determine a cyclic shift index in the set of cyclic shift indexes as rFB channelmod(NCS·NOCC)mod NCSThe UE may determine an OCC index in the OCC index set as
Figure BDA0003122611300000166
In some embodiments, if
Figure BDA00031226113000001610
Then:
the UE may determine the PRB index of the PUCCH transmission in the first hop as
Figure BDA0003122611300000167
And determining a PRB index of the PUCCH transmission in the second hopping as
Figure BDA0003122611300000168
The UE may determine a cyclic shift index in the set of cyclic shift indexes as
Figure BDA0003122611300000169
The UE may determine an OCC index in the OCC index set as
Figure BDA00031226113000001611
In some embodiments, any combination of CS, OCC, and scrambling code ID may be configured to support multicast feedback resource configuration. For example, in the above example, CS may be replaced with the scrambling code ID, or in the above example, CS may be replaced with the scrambling code ID, and the positions of the scrambling code ID and OCC, and the like may be further exchanged (e.g., changed).
In some embodiments, when one or more of the CS, OCC and scrambling code ID may be configured as a multicast feedback resource or a broadcast feedback resource. Further, the UE may determine the feedback resource index for each factor based on adding a configured or available or maximum index number for more than one factor (factor) and at least one factor that is, for example, a configured, determined, available or maximum index number.
Figure BDA0003122611300000171
Table 2: multicast HARQ feedback resource parameters
For scenario 1, the correspondence or mapping table between UE indices and FB resource parameters delta and delta' is exemplarily shown (table 3). The UE-specific FB resource parameter is determined based on the delta value with the 4-bit SCI indication and the corresponding UE index.
Figure BDA0003122611300000172
Table 3 correspondence between UE index and FB resource parameter
For scheme 2, a correspondence or mapping table between UE index, offset value, and FB resource parameters delta and delta' is exemplarily shown. The UE-specific FB resource parameter is determined based on the delta value with the 3-bit SCI indication, the corresponding UE index and the configured offset k. For table 5, the value of k is determined to be 0, and for table 5, the value of k is determined to be 2.
Delta (3 bits) Delta' set ═ Delta + UE index + k (k ═ O) UE indexing
0 {0，1，2} {0，1，2}
1 {1，7，3} {0，1，2}
2 {2，3，4} {O，1，2}
3 {3，4，5} {0，1，2}
4 {4，5，6} {0，1，2}
5 {5，6，7} {0，1，2}
6 {6，7，8} {0，1，2}
7 {7，8，9} {0，1，2}
Table 4 correspondence between UE index, offset k and FB resource parameter
Delta Delta' sct ═ Delta + UE index + k (k ═ 2) UE indexing
0 {2，3，4} {0，1，2}
1 {3，4，5} {0，1，2}
2 {4，5，6} {0，1，2}
3 {5，6，7} {0，1，2}
4 {6，7，8} {0，1，2}
5 {7，8，9} {0，1，2}
6 {8，9，10} {0，1，2}
7 {9，10，11} {0，1，2}
Table 5 correspondence between UE index, offset k and FB resource parameter
For scenario 3, the group-specific common parameters may be determined as described above. However, the UE-specific signaling may configure the correspondence between its feedback index and the group ID. When one group DCI or SCI or MAC CE is used, the feedback index is configured by UE specific signaling, which may define the bit position of the feedback indication of the UE in the group DCI or group SCI or group specific MAC CE. In some embodiments, the group-specific signaling may carry a UE-specific feedback channel resource indicator. Assuming the feedback position is N (enumerated from 0), each PRB supports, for example, 0 feedback resources including both CS and OCC. Each feedback index may correspond to M bits of a feedback resource indication specific to the UE, and then the UE or the transmitter may be based on
Figure BDA0003122611300000181
Determining a feedback resource PRB; and may determine its feedback resources in the indicated PRB, e.g., according to an indication of M bits in the group DCI or group SCI.
In some embodiments, the subgroup-based feedback channel may be supported for multicast or broadcast transmission. For example, the UEs may receive the same multicast transmission, e.g., using the same group RNTI, which may have different feedback channel configurations. Furthermore, different channel conditions may exist for UEs within a group. For UEs with poor received signal quality, for example, more robust feedback channel configurations with long feedback channel formats or more symbols may be preferred, which may belong to a subgroup. However, for UEs with relatively good channel conditions, short feedback channel formats with shorter feedback delays or fewer symbols may be configured, or no feedback may be configured, which may belong to another subgroup. The transmission timing for the short feedback channel format and for the long feedback channel format or for different subgroups may also be different. In some embodiments, orthogonal resources may be configured for different subgroups. The subgroup configuration may be in UE-specific signaling or in group-specific signaling or in both UE-specific signaling and group-specific signaling. According to the above description, the UE may be configured with a UE index within the subgroup to obtain a UE-specific feedback channel resource configuration.
In some embodiments, feedback channel resource multiplexing between different UEs may be supported by supporting orthogonal sequences or code multiplexing with time sequencing and/or frequency sequencing and/or code sequencing. For example, since the number of codes per PRB or per PRB/RB group is limited, code selection or code allocation may be performed within an RB or RB group first based on the configured code sequence, then between RBs or RB groups based on the configured frequency or RB group sequence, or alternatively between slots or minislots based on the configured time sequence.
In some embodiments, feedback channel resource multiplexing between different UEs may be supported by supporting orthogonal sequence or code multiplexing and/or NACK-only feedback or a portion of the UEs within a group or a subset of UEs for feedback in UE-specific feedback channel resources, as described by the UE-specific feedback resource configuration.
In some embodiments, a receiving node, e.g. a gNB or RSU or RN or UE, may obtain UE-specific feedback information based on UE-specific feedback resources. Further, it may be determined which UE decoded the multicast transmission in error. For example, the UE-specific retransmission may be configured to assist in multicast data decoding or broadcast data decoding.
In some embodiments, the UE-specific feedback resource configuration may also be configured for UE-specific retransmissions. For example, the retransmission times and corresponding transmission and feedback resources are configured for the sidelink, and then HARQ ACK/NACK is fed back to the network UE when the sidelink reaches the maximum retransmission times or ACK is received. As another example, unicast assisted multicast retransmission may be configured. Unicast assisted multicast retransmission may be included in the signaling for the UE. Further, an identification of unicast assisted multicast retransmission may be included in the signaling for the UE to soft combine the initial multicast transmission and the unicast retransmission. Furthermore, HARQ process ID correspondence or alignment between multicast/multicast transmissions and unicast assisted retransmissions may be supported. In some embodiments, the unicast transmission may use the same mapping or correspondence of HARQ process IDs or configurations between multicast or broadcast HARQ IDs and unicast HARQ IDs as multicast or broadcast transmissions. Further, UE-specific beamforming configuration with UE-specific RS quasi co-location (QCL) assumption may be used for unicast-assisted multicast retransmission.
Note that the above UE-specific feedback resource determination for multicast transmissions may also be applied for unicast transmissions. In some embodiments, the group ID may be identical to the UE ID, and the group-specific configuration and related parameters may become UE-specific.
In some embodiments, sub-group based shared channel feedback for multicast or broadcast transmissions may be supported. As described above, the UE may receive the same multicast or broadcast transmission, e.g. using the same group RNTI which may be classified into different sub-groups. Furthermore, different subgroups may have different channel configurations and different feedback configurations. Within the same subgroup, a shared feedback channel may be configured. Furthermore, HARQ NACK-only feedback in the shared channel or a separate shared channel may be configured for HARQ ACKs and NACKs. Examples are shown in fig. 8, table 6, and table 7.
Fig. 8 schematically illustrates a system 800 for supporting subgroup-based shared feedback channel resources according to various embodiments of the invention. Wherein two vehicle subgroups 801, 802 of subgroup 1 (including UE2 and UE3)801 and subgroup 2 (including UE4 and UE5)802 are configured, and further, different symbol configurations and orthogonal resources are configured for the two subgroups. Another case is that the UEs in a group or some of the UEs within a subgroup may be configured with HARQ feedback. For example, only UEs with poor channel conditions (e.g., signal power below a certain threshold) may be configured with HARQ feedback, or some subgroups may be configured with HARQ feedback.
Figure BDA0003122611300000201
Table 6 subgroup-based shared channel feedback, NACK only
Figure BDA0003122611300000202
TABLE 7 subgroup-based shared channel feedback, both ACK and NACK
In some embodiments, relay feedback for multicast, broadcast, and unicast transmissions may be supported.
For example, in some embodiments, sidelink feedback may be sent from one or more UEs to a selected or configured UE.
In some embodiments, the sidelink feedback may be sent from one or more UEs to one selected or configured UE and then to the selected or configured dominant UE. In some embodiments, the sidelink feedback may be sent from one or more UEs to one selected or configured UE, then to a selected or configured dominant UE, and then to the gNB or RSU. Sidelink feedback may be sent from one or more UEs to the gNB or RSU. The feedback information (e.g., feedback message) may include sidelink feedback information or Uu chain feedback information or both.
The selected or configured UE may be configured by, for example, the gNB, RSU, RN, or another UE. The dominant UE may be configured by, for example, the gbb, RSU, RN. In some embodiments, particularly for coverage scenarios, the gNB or RSU is responsible for scheduling, but the gNB or RSU or RN may configure a particular UE for scheduling within the configured resources.
Further, when the feedback information is HARQ feedback, the selected or configured UE or the dominant UE may perform aggregated or concatenated processing. It may then be further sent or relayed or forwarded to another node, for example. For the processing of aggregation, it may be a bundled ACK and/or NACK operation or an and operation of ACKs and/or NACKs received from more than one link or more than one UE. For example, when at least one NACK is received, the selected or dominant UE may forward the NACK to another node. When all received feedback is an ACK, the UE may forward the ACK to another node. The other node may be a UE or a gNB or an eNB or an RSU or an RN.
Advantages of aggregating or bundling ACKs and NACKs across links include shorter transmission time required for feedback, which means short delay time and reduced feedback overhead, especially for TDD systems.
Additionally, the enabling or disabling of the aggregation or bundling of ACKs and NACKs across links or between or among UEs may be further configured. For example, UEs or their feedback, which may be aggregated or bundled, may be further configured. For example, it may be a subgroup or group based aggregation or bundling.
For processing that may be applied to concatenation of both unicast and multicast feedback processing (sidelink only and combined sidelink and Uu link), pre-defined or pre-configured or signaling may be configured at the feedback information location in the concatenated report for each of the UEs or each group of UEs. The feedback configuration signaling may include one or more of the following: for example, unicast feedback information, multicast or broadcast feedback information, unicast feedback information position, multicast or broadcast feedback information position, UE ID, group ID, destination ID, source ID, feedback channel format or PUCCH format, symbol configuration, starting PRB, resource pool configuration, CS configuration, OCC configuration, pseudo random sequence configuration, etc. Further, based on the configuration, the UE or RSU or RN may process the concatenation of the received feedback information to the next node.
In some embodiments, sidelink feedback in the Uu link may be used. Further, the UE may only feed back SL HARQ ACK/NACK and/or sidelink Channel State Information (CSI) in the Uu link and may allocate dedicated resources for sidelink feedback transmission. Further, when both Uu feedback and SL feedback coexist in the Uu link, they may be jointly transmitted in a predefined or configured order. The order may be (SL feedback, Uu feedback }, or (Uu feedback, SL feedback }. e.g., (SL ACK/NACK, Uu ACK/NACK), or (Uu ACK/NACK, SL ACK/NACK), noting that only NACK or only ACK or both ACK and NACK from SL may be supported based on one or more of the above combinations. Since there may be more than one sidelink communication, there may be more than one HARQ feedback bit from SL feedback. Further, joint coding or joint transmission may be sent with sequence selection or CS selection or modulation symbol selection. For example, { uu ACK/NACK, SL ACK/NACK }: {0, 0} corresponds to CS 1; {0, 1} corresponds to CS 2; {1, 0} corresponds to CS 3; {1, 1} corresponds to CS 4; or {0, 0} corresponds to modulation symbol 1; {0, 1} corresponds to modulation symbol 2; {1, 0} corresponds to modulation symbol 3; {1, 1} corresponds to modulation symbol 4. Further, when UCI including both Uu and SL feedback is mapped to resource elements, bits of higher priority may be mapped to REs closer to RS in order to obtain better performance. The priority or mapping location may be configured. For example, SL HARQ feedback may have a higher priority than Uu link HARQ feedback or CSI feedback. Since SL feedback to the network may include both Uu links and SLs with more delay. SL HARQ feedback bits may be mapped close to DMRS symbols.
Fig. 9 illustrates a method 900 according to an embodiment of the invention, the method 900 being used to support a UE feedback mechanism for unicast or multicast or broadcast transmissions. As described above, method 900 may be performed by device 100.
The method 900 includes the step 901: one or more of the feedback channel resources 101 for one UE 110 or a subgroup or group of UEs 110 are determined, wherein each determined feedback channel resource 101 is a UE-specific feedback channel resource or a shared feedback channel for one UE 110 or a group or subgroup of UEs 110.
The method 900 further includes a step 902: UE-specific signaling or sub-group-specific signaling or group-specific signaling 102 is sent to the UE 110 or a sub-group or group of UEs 110, the UE-specific signaling or sub-group-specific signaling or group-specific signaling 102 comprising one or more parameters 103 indicative of at least one of the determined feedback channel resources 101.
Fig. 10 illustrates a method 1000 of the wireless communication device 110 according to an embodiment of the invention. As described above, the method 1000 may be performed by the wireless communication device 110.
The method 1000 includes the steps 1001: UE-specific signaling 102 or sub-group-specific signaling 102 is received from the network device 100, the UE-specific signaling 102 or sub-group-specific signaling 102 comprising one or more parameters 103 indicative of the at least one determined feedback channel resource 101.
The method 1000 further comprises step 1002: one or more feedback messages 111 are transmitted to the network device 100 and/or a further node using at least one determined feedback channel resource 101, wherein the at least one determined feedback channel resource 101 is a UE-specific feedback channel resource or a shared feedback channel resource for a subgroup of UEs 110.
The invention has been described in connection with various embodiments and implementations as examples. However, other variations will occur to those skilled in the art practicing the claimed invention, from a study of the drawings, the disclosure, and the independent claims. In the claims as well as in the description, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. A single element or other unit may fulfill the functions of several entities or items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims (17)

1. A network device (100) for supporting a user equipment, UE, feedback mechanism for unicast or multicast or broadcast transmissions, the network device (100) being configured to:
determining one or more of the feedback channel resources (101) for one UE (110) or a subgroup or group of UEs (110),
wherein each determined feedback channel resource (101) is a UE-specific feedback channel resource or a shared feedback channel resource for one UE (110) or a group or subgroup of said UEs (110); and
sending UE-specific or subgroup-specific signaling or group-specific signaling (102) to a UE (110) or a subgroup or group of said UEs (110), said UE-specific or subgroup-specific signaling or group-specific signaling (102) comprising one or more parameters (103) indicative of at least one of the determined feedback channel resources (101).
2. The network device (100) of claim 1, further configured to:
determining a correspondence between the group identification ID and/or the subgroup ID and one or more of:
-a UE index;
-a UE identity;
-a feedback index.
3. The network device (100) of claim 2,
the UE-specific signaling (102) or the sub-group-specific signaling (102) or the group-specific signaling (102) is sent based on the determined correspondence.
4. Network device (100) according to one of claims 1 to 3,
each determined feedback channel resource (101) is configured to support one or more of:
-feedback to the destination device;
-relaying feedback to the destination device via the relay device.
5. Network device (100) according to one of claims 1 to 4,
the UE-specific signaling (102) and/or the group-specific signaling (102) and/or the subgroup-specific signaling (102) comprise one or more of:
-higher layer signaling indicating group-specific or sub-group-specific feedback channel parameters; and/or
-lower layer signaling indicating a group-specific or subgroup-specific feedback channel resource indication value; and/or
-higher layer signalling indicating an association between a UE ID or UE index and a group ID or sub-group ID; and/or
-higher layer signaling indicating an association between a UE ID or UE index and a feedback index carried in group or sub-group specific lower layer signaling.
6. The network device (100) according to one of claims 1 to 5, further configured to:
multiplexing two or more feedback channel resources (101) based on time sequencing and/or frequency sequencing and/or code sequencing.
7. The network device (100) according to one of claims 1 to 6, further configured to:
receiving one or more feedback messages from one or more of the UEs (110), wherein the feedback message for each UE (110) is received in the determined UE-specific feedback channel resource (101) or the determined shared feedback channel resource (101).
8. The network device (100) of claim 7,
the received feedback message comprises a negative acknowledgement NACK and/or an acknowledgement ACK.
9. Network device (100) according to one of claims 1 to 8,
each feedback channel resource (101) is determined by one or more of:
-a starting position of a physical downlink control channel, PDCCH,
-a starting position of a physical sidelink control channel PSCCH,
-a resource pool configuration of the data channel,
-resource pool configuration of feedback channels and/or control channels,
-a predefined or configured association between a data channel and/or a control channel and a feedback channel resource pool,
-a group specific downlink control information, DCI, indication value,
-a group specific sidelink control information SCI indication value,
-a group specific radio resource control RRC and/or MAC control element MAC CE,
-indicating a feedback resource parameter,
-the group specific higher layer signaling indicates feedback resource parameters,
-a UE index,
-an offset k of the first and second offset,
-a feedback index for the feedback information,
-a group ID,
-a subgroup ID,
-a sequence type of the sequence,
-a cyclic shift value of the cyclic shift value,
-an OCC index, the OCC index,
-a scrambling code ID,
-unicast or multicast or both unicast and multicast transmission types.
10. A method (900) for supporting a user equipment, UE, feedback mechanism for unicast or multicast or broadcast transmissions, the method (900) comprising:
determining one or more of the feedback channel resources (101) for one UE (110) or a subgroup or group of UEs (110),
wherein each determined feedback channel resource (101) is a UE-specific feedback channel resource or a shared feedback channel resource for one UE (110) or a group or subgroup of said UEs (110); and
sending UE-specific or subgroup-specific signaling or group-specific signaling (102) to a UE (110) or a subgroup or group of said UEs (110), said UE-specific or subgroup-specific signaling or group-specific signaling (102) comprising one or more parameters (103) indicative of at least one of the determined feedback channel resources (101).
11. A wireless communication device (110), UE, configured to:
receiving UE-specific signaling (102) or sub-group-specific signaling (102) or group-specific signaling (102) from a network device (100), the UE-specific signaling (102) or sub-group-specific signaling (102) or group-specific signaling (102) comprising one or more parameters (103) indicative of at least one determined feedback channel resource (101); and
transmitting one or more feedback messages (111) to the network device (100) and/or a further node using the at least one determined feedback channel resource (101),
wherein the at least one determined feedback channel resource (101) is a UE specific feedback channel resource (101) or a shared feedback channel resource (101) for a group or subgroup of the UEs (110).
12. The wireless communication device (110) of claim 11,
the UE-specific signaling (102) or the subgroup-specific signaling (102) or the group-specific signaling indicates a correspondence between a group identification ID and one or more of:
-a UE index;
-a UE identity;
-a feedback index.
13. The wireless communication device (110) of claim 11 or 12,
the transmitted feedback message comprises a negative acknowledgement NACK and/or an acknowledgement ACK.
14. The wireless communication device (110) according to one of claims 11 to 13,
each feedback channel resource (101) is determined by one or more of:
-a starting position of a physical downlink control channel, PDCCH,
-a starting position of a physical sidelink control channel PSCCH,
-resource pool configuration of data channels;
-resource pool configuration of feedback channels and/or control channels,
-a predefined or configured association between a data channel and/or a control channel and a feedback channel resource pool,
-a group downlink control information, DCI, indication value,
-a group sidelink control information SCI indication value,
-a group specific radio resource control, RRC, and/or MAC control element, MAC CE;
-indicating a feedback resource parameter,
-the group specific higher layer signaling indicates feedback resource parameters,
-a UE index,
-an offset k of the first and second offset,
-a feedback index for the feedback information,
-a group ID,
-a subgroup ID,
-a sequence type of the sequence,
-a cyclic shift value of the cyclic shift value,
-an OCC index, the OCC index,
-a scrambling code ID,
-unicast or multicast or both unicast and multicast transmission types.
15. The wireless communication device (110) according to one of claims 11 to 14, further configured to:
transmitting, while serving as a relay UE, an aggregated hybrid automatic repeat request, HARQ, feedback message to another node, wherein the aggregated HARQ feedback message comprises a NACK if at least one feedback message is a NACK.
16. The wireless communication device (110) of one of claims 11 to 15, further configured to:
when acting as a relay UE, transmitting a concatenated HARQ feedback message to a further node, wherein the concatenated HARQ feedback message comprises one or more feedback messages received from a UE or a subgroup of UEs or a group of UEs.
17. A method (1000) of a wireless communication device (110), UE, the method (1000) comprising:
receiving (1001) UE-specific signaling (102) or sub-group or group-specific signaling (102) from a network device (100), the UE-specific signaling (102) or sub-group or group-specific signaling (102) comprising one or more parameters (103) indicative of at least one determined feedback channel resource (101); and
transmitting (1002) one or more feedback messages (111) to the network device (100) and/or a further node using the at least one determined feedback channel resource (101),
wherein the at least one determined feedback channel resource (101) is a UE specific feedback channel resource or a shared feedback channel resource for a UE or a group of the UEs (110) or a sub-group of the UEs (110).
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