CN114287115A - HARQ feedback and associated retransmission on reserved resources based on side link CBG - Google Patents

HARQ feedback and associated retransmission on reserved resources based on side link CBG Download PDF

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Publication number
CN114287115A
CN114287115A CN201980099809.5A CN201980099809A CN114287115A CN 114287115 A CN114287115 A CN 114287115A CN 201980099809 A CN201980099809 A CN 201980099809A CN 114287115 A CN114287115 A CN 114287115A
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China
Prior art keywords
sidelink
code block
transmission
communication device
feedback
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CN114287115B (en
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李栋
刘勇
T·维尔德斯彻克
谭钧
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Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
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Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
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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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • 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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

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

Abstract

According to example embodiments of the invention disclosed herein, there is at least a method and apparatus for performing sidelink transmissions towards a second communication device for a transport block associated with sidelink transmissions using resource reservation by a first communication device; and in response to receiving hybrid automatic repeat request (HARQ) feedback for the sidelink transmission, performing at least primary-side link retransmission for the code block group of the negatively acknowledged transport block using some or all of the reserved resources. Additionally, at least one method and apparatus for: monitoring, by the third communication device, a sidelink control channel for sidelink transmissions from the first communication device; monitoring a sidelink feedback channel for feedback from the second communication device for sidelink transmissions; and performing resource selection for sidelink transmissions based on monitored parameters from sidelink control channels and sidelink feedback channels related to sidelink retransmissions.

Description

HARQ feedback and associated retransmission on reserved resources based on side link CBG
Technical Field
The teachings in accordance with the exemplary embodiments of this invention relate generally to sidelink transmissions and retransmissions and, more particularly, relate to sidelink transmissions and retransmissions using code block group based HARQ feedback associated with sidelink transmissions.
Background
This section is intended to provide a background or context to the invention that is recited in the claims. The description herein may include concepts that could be pursued, but are not necessarily ones that have been previously conceived or pursued. Thus, unless otherwise indicated herein, what is described in this section is not prior art to the description and claims in this application and is not admitted to be prior art by inclusion in this section.
Certain abbreviations that may be found in the specification and/or in the figures are defined herein as follows:
CBG: code block group
CBGFI: code block group feedback information
CBGTI: code block group transmission information
D2D device-to-device
DCI: downlink control information
HARQ hybrid automatic repeat request
PRB: physical resource block
NR new radio
ProSe proximity-based services
PSFCH physical sidelink feedback channel
PSCCH: physical side link control channel
PSSCH: physical side link shared channel
PSFCH: physical side link feedback channel
PUCCH physical uplink control channel
RAN radio access network
reTX: retransmission
SCI: side link control information
SFCI: side link feedback control information
SL: side link
TB: transmission block
TBS: transport block size
UE: user equipment
V2X vehicle-to-all
Some communication systems are capable of performing V2X and D2D communications. The V2X communication may be based on a communication technology, such as a "sidelink" communication technology. To this end, a sidelink resource pool and a sidelink channel may be established for vehicles participating in such communications. In addition, such sidelink communication technology for V2X communication may be referred to as device-to-device (D2D) communication technology, and uses proximity-based services (ProSe) communication, for example.
Further, in the V2X communication, when the sidelink/D2D communication technology is applied, the network device located in the vehicle can perform the V2X communication using a resource allocated by the base station or a resource autonomously selected within a resource pool configured by the base station. The base station may also adjust the V2X communication parameters in order to attempt to achieve a maximum transmission power and/or range based on channel congestion.
Further, in the V2X communication, a network device located in a vehicle may perform V2X communication with a base station using a radio interface (e.g., Uu interface in LTE or 5G cellular network) to communicate with another V2X communication network device or a V2X service application server through a wireless network.
Example embodiments of the present invention provide for improved operations associated with devices that perform at least these operations as described above.
Disclosure of Invention
This section contains examples of possible implementations and is not meant to be limiting.
In an example embodiment of the invention, a method comprises: performing, by the first communication device, a sidelink transmission towards the second communication device for a transport block associated with the sidelink transmission using the resource reservation; and in response to receiving hybrid automatic repeat request (HARQ) feedback for the sidelink transmission, performing at least primary-side link retransmission for the code block group of the negatively acknowledged transport block using some or all of the reserved resources.
Another exemplary embodiment of the present invention is a method, including the method of the previous paragraph, wherein the sidelink transmission comprises: a sidelink control channel transmission that conveys sidelink control information associated with the sidelink transmission; and a sidelink shared channel transmission that conveys code blocks associated with the transport blocks, wherein performing the sidelink transmission comprises: determining a code block segmentation of a transport block; determining a number of code block groups associated with code blocks obtained by the code block segmentation; and determining reserved resources for retransmission for a group of code blocks of the transport block, wherein performing sidelink transmissions further comprises: setting a code block group correlation information field in sidelink control information based on the determined code block segmentation and transport block code block group number associated with the transport block; and setting a resource reservation related information field in the sidelink control information based on the determined reserved resources for potential retransmissions associated with the transport block; generating a side link control channel and a side link shared channel; and transmitting a sidelink control channel and a sidelink shared channel for sidelink transmission on a sidelink towards the second communication device, wherein the hybrid automatic repeat request feedback comprises: receiving hybrid automatic repeat request feedback information based on code block groups from the second communication device on a sidelink feedback channel from the second communication device, wherein determining the number of code block groups associated with code blocks obtained by code block segmentation comprises at least one of: determining a number of code block groups based on the total number of code blocks and the code block size; or determining the number of code block groups based on the transport block size, wherein the code block group related information field of the sidelink control information includes: code block group numbers corresponding to the determined number of code block groups of the associated transport block; and code block group transmission information including a bitmap identifying code block group numbers, the bitmap indicating the presence or absence of a corresponding code block group in a current sidelink transmission, wherein a resource reservation related information field of sidelink control information includes at least one of: information on at least one resource reservation in a time domain, the time domain comprising one or more time slots; or information on at least one resource reservation in the frequency domain, the frequency domain comprising one or more subchannels, and/or wherein performing at least primary-side link retransmission for a group of code blocks of a negatively acknowledged transport block using reserved part or all of reserved resources comprises: performing sidelink retransmission for the negatively acknowledged code block group using some or all of the reserved resources in the frequency domain over some or all of the reserved resources in the time domain.
In another example embodiment of the present invention, an apparatus comprises: means for performing, by the first communication device, a sidelink transmission towards the second communication device for a transport block associated with the sidelink transmission using the resource reservation; and means for performing at least primary-side link retransmission for a block group of negatively-acknowledged transport blocks using some or all of the reserved resources in response to receiving hybrid automatic repeat request (HARQ) feedback for the sidelink transmission.
Another example embodiment of the present invention is an apparatus comprising the apparatus of the previous paragraph, wherein the sidelink transmissions comprise: a sidelink control channel transmission that conveys sidelink control information associated with the sidelink transmission; and a sidelink shared channel transmission that conveys code blocks associated with the transport blocks, wherein performing the sidelink transmission comprises: determining a code block segmentation of a transport block; determining a number of code block groups associated with code blocks obtained by the code block segmentation; and determining reserved resources for retransmission for a group of code blocks of the transport block, wherein performing sidelink transmissions further comprises: setting a code block group correlation information field in sidelink control information based on the determined code block segmentation and transport block code block group number associated with the transport block; and setting a resource reservation related information field in the sidelink control information based on the determined reserved resources for potential retransmissions associated with the transport block; generating a side link control channel and a side link shared channel; and transmitting a sidelink control channel and a sidelink shared channel for sidelink transmission on a sidelink towards the second communication device, wherein the hybrid automatic repeat request feedback comprises: receiving hybrid automatic repeat request feedback information based on code block groups from the second communication device on a sidelink feedback channel from the second communication device, wherein determining the number of code block groups associated with code blocks obtained by code block segmentation comprises at least one of: determining a number of code block groups based on the total number of code blocks and the code block size; or determining the number of code block groups based on the transport block size, wherein the code block group correlation information field of the sidechain control information includes: code block group numbers corresponding to the determined number of code block groups of the associated transport block; and code block group transmission information including a bitmap identifying code block group numbers, the bitmap indicating presence or absence of a corresponding code block group in a current sidelink transmission, wherein a resource reservation related information field of sidelink control information includes at least one of: information on at least one resource reservation in a time domain, the time domain comprising one or more time slots; or information on at least one resource reservation in the frequency domain, the frequency domain comprising one or more subchannels, and/or wherein performing at least primary-side link retransmission for a group of code blocks of a negatively acknowledged transport block using reserved part or all of reserved resources comprises: performing sidelink retransmission for the negatively acknowledged code block group using some or all of the reserved resources in the frequency domain over some or all of the reserved resources in the time domain.
In another example embodiment of the present invention, an apparatus comprises one or more processors and one or more memories including computer program code. The one or more memories and the computer program code are configured to, with the one or more processors, cause the apparatus to at least: performing, by the first communication device, a sidelink transmission towards the second communication device for a transport block associated with the sidelink transmission using the resource reservation; and in response to receiving hybrid automatic repeat request (HARQ) feedback for the sidelink transmission, performing at least primary-side link retransmission for the code block group of the negatively acknowledged transport block using some or all of the reserved resources.
Another example embodiment of the present invention includes a computer program comprising code for: performing, by the first communication device, a sidelink transmission towards the second communication device for a transport block associated with the sidelink transmission using the resource reservation; and in response to receiving hybrid automatic repeat request (HARQ) feedback for the sidelink transmission, performing at least primary-side link retransmission for the code block group of the negatively acknowledged transport block using some or all of the reserved resources.
In another example embodiment of the present invention, a method comprises: monitoring, by the third communication device, a sidelink control channel for sidelink transmissions from the first communication device; monitoring a sidelink feedback channel for feedback of a contralateral link transmission from a second communication device; and performing resource selection for the sidelink transmission based on the monitored parameters and feedback for the sidelink transmission.
Other example embodiments of the present invention include a method, including the method of the previous paragraph, wherein the parameters include: information of reserved resources for sidelink transmission and feedback, wherein the third communication device derives from the parameters part or all of the resources to be used for sidelink retransmission and remaining resources to be implicitly released of the reserved resources, wherein the monitoring comprises: decoding the sidelink control channel, and obtaining code block group related information and resource reservation information code blocks for sidelink retransmission from sidelink control information, wherein the processing comprises: detecting a side link feedback channel, and obtaining information of hybrid automatic repeat request feedback based on a code block group from side link feedback control information, wherein the resource selection executed aiming at side link transmission comprises the following steps: in view of the resource selection for sidelink transmission, at least one of the following is effectively reserved: resources reserved by the first communication device, resources monitored by the third communication device, and resources to be used by a plurality of negatively acknowledged code block groups indicating code blocks by hybrid automatic repeat request feedback based on the code block groups, and wherein any remaining reserved resources are implicitly released, wherein the resource selection uses at least one of remaining reserved resources and unreserved resources that are implicitly released.
In another example embodiment of the present invention, an apparatus comprises: means for monitoring, by the third communication device, a sidelink control channel for sidelink transmissions from the first communication device; means for monitoring a sidelink feedback channel for feedback transmitted from a contralateral link of the second communication device; and means for performing resource selection for sidelink transmissions based on monitored parameters related to sidelink retransmissions from a sidelink control channel and a sidelink feedback channel.
Additional example embodiments of the present invention include an apparatus comprising the apparatus of the previous paragraph, wherein the parameter comprises information of reserved resources for sidelink transmission and feedback, wherein the third communication device derives from the parameter part or all of the resources to be used for sidelink retransmission and remaining resources to be implicitly released, wherein the means for monitoring comprises: decoding the sidelink control channel, and obtaining code block group related information and resource reservation information code blocks for sidelink retransmission from the sidelink control information, wherein the means for processing comprises: means for detecting a sidelink feedback channel, and means for obtaining information of hybrid automatic repeat request feedback based on a code block group from sidelink feedback control information, wherein the means for performing resource selection for sidelink transmission comprises: means for allowing for at least one of the following to be effectively reserved in the selection of resources for sidelink transmission: resources reserved by the first communication device, resources monitored by the third communication device, and resources to be used by a plurality of negatively acknowledged code block groups indicating code blocks by hybrid automatic repeat request feedback based on the code block groups, and wherein any remaining reserved resources are implicitly released, wherein the resource selection uses at least one of remaining reserved resources and unreserved resources that are implicitly released.
In another example embodiment of the present invention, an apparatus comprises one or more processors and one or more memories, the one or more memories comprising computer program code. The one or more memories and the computer program code are configured to, with the one or more processors, cause the apparatus to at least: monitoring, by the third communication device, a sidelink control channel for sidelink transmissions from the first communication device; monitoring a sidelink feedback channel for feedback from the contralateral link transmission of the second communication device; and performing resource selection for sidelink transmissions based on monitoring parameters related to sidelink retransmissions from a sidelink control channel and a sidelink feedback channel.
Another example embodiment of the present invention includes a computer program comprising code for monitoring, by a third communication device, a sidelink control channel for sidelink transmissions from a first communication device; monitoring a sidelink feedback channel for feedback of sidelink transmissions from the second communication device; and performing resource selection for sidelink transmissions based on monitored parameters related to sidelink retransmissions from a sidelink control channel and a sidelink feedback channel.
Drawings
The above and other aspects, features and benefits of various embodiments of the present disclosure will become more apparent in the following detailed description, which proceeds with reference to the accompanying drawings, in which like reference numerals are used to refer to like or equivalent elements. The drawings are shown to facilitate a better understanding of embodiments of the disclosure and are not necessarily drawn to scale, wherein:
FIG. 1A shows a flow chart of an example embodiment of the invention;
fig. 1B shows a table with transport block sizes, code block group numbers and associated values of control information bits for operation in accordance with an example embodiment of the present invention;
fig. 2 illustrates sidelink transmission and retransmission operations on partially reserved resources, and shrinking reserved resources in frequency, according to an example embodiment of the present invention;
FIG. 3 illustrates sidelink transmission and retransmission operations on partially reserved resources, and shrinking reserved resources in time, in accordance with an exemplary embodiment of the present invention;
FIG. 4 illustrates a side road operation between vehicles according to an example embodiment of the invention;
FIG. 5 illustrates a simplified block diagram of an exemplary electronic device suitable for practicing various exemplary embodiments of the present invention; and
fig. 6A and 6B each show a method that may be practiced by an apparatus according to an example embodiment of the present invention.
Detailed Description
In the present invention, at least a method and apparatus for sidelink transmission and retransmission using a chunk-based HARQ feedback associated with sidelink transmission is proposed.
The LTE V2X side link is defined in LTE R14 to support direct communication of basic road safety services between vehicles and vehicles/pedestrians/infrastructure. In LTE release 15, the V2X side chain is further enhanced with features of carrier aggregation, higher order modulation, and latency reduction to support more diverse services and more stringent service requirements.
To more efficiently support advanced V2X services, 3GPP created a research project in Rel-16 for NR V2X to investigate the feasibility and performance of potential solutions. The present study concludes that it is feasible to support advanced V2X services using the technical solutions identified during the study. On the RAN #83 conference en masse, a work item of NR V2X was created to standardize the NR V2X specification in release 16 to support advanced V2X services. It is expected that NR V2X operation will continue in release 17 for performance/function enhancement.
In advanced V2X services, data packet sizes vary widely over a wide dynamic range, depending on the particular V2X service, e.g., from hundreds of bytes to tens of thousands of bytes. In the case of very large data packet Transport Blocks (TBs), the TBs may contain a relatively large number of code blocks, and in this case CBG-based HARQ feedback may effectively improve retransmission resource efficiency. On the other hand, in the Rel-16 NR V2X work item, consistent across RAN1-97, previous transmissions may reserve resources for the next retransmission of the psch for HARQ feedback based PSSCH for the same packet transport block. Inspired by the above aspect, some technical problems which exemplary embodiments of the present invention aim to solve include:
how to support CBG-based HARQ feedback in the sidelink; and
how to perform retransmissions triggered by CBG based HARQ feedback on reserved resources.
In the ongoing Rel-16 NR V2X work project, supporting HARQ feedback in the sidelink is an important topic. However, the discussion mainly focuses on simple TB-based HARQ feedback, not CBG-based HARQ feedback.
In the NR system (Rel-15), TB-based HARQ feedback and CBG-based HARQ feedback are supported based on NR PUCCH format 0 and format 2, respectively. For CBG-based HARQ feedback, UE-specific higher layer signaling is used to configure the CBG number, and other HARQ related parameters are conveyed in the dynamic DCI signaling. In principle, there are some significant differences between the CBG-based HARQ feedback in cellular DL/UL and the CBG-based HARQ feedback in the sidelink. The difference is mainly reflected in the following two aspects:
in the sidelink, the CBG-based HARQ feedback channel PSFCH should be decodable and understandable not only by its target receiver (i.e. the transmitter of the data packet PSSCH), but also by other UEs that are sensing the sidelink channel; and
in the side link, as described above, for the same packet transport block, the previous transmission may reserve resources for the next retransmission of the pscch for HARQ feedback based. In this case, how to retransmit based on CBG-based HARQ feedback on reserved resources remains an open question.
Inspired by these considerations, the present invention aims to address the technical challenges and needs as described above.
Comments about some inventive aspects：
Inventive aspects according to example embodiments of the present invention include at least the following:
dynamic configuration and indication of CBG based HARQ feedback related parameters, step 1 as described below. This not only enables the CBG-based flexible HARQ feedback mechanism to adapt to dynamic packet sizes, but also facilitates other sensing UEs to monitor and know HARQ feedback information; and
side-link retransmissions may occupy only part of the reserved resources based on specific CBG-based HARQ feedback and release other reserved resources, step 3 described below. In this way, the original reserved resources corresponding to the entire packet TB size are gradually released over multiple (re-) transmissions of the TB. Therefore, resource efficiency is greatly improved, and this is particularly significant for large packet TB sizes.
Before describing an example embodiment of the present invention in more detail, however, reference is made to FIG. 5, which shows a block diagram of one possible and non-limiting example system in which the example embodiment may be practiced.
Turning to fig. 5, a block diagram of one possible and non-limiting exemplary system in which the exemplary embodiments may be practiced is shown. The network node NN 110 and the network node NN 90, any of which is for example a user equipment, UE. In addition, there is a Radio Access Network (RAN) node 170 and network element(s) 190 shown in fig. 5. As shown in fig. 5, the NN 110 and NN 90 communicate wirelessly with a wireless network 100. The NNs 110 and 90 are typically wireless mobile devices, such as UEs, that may access the wireless network 100. The UE may include, for example, a mobile telephone (or "cellular" telephone) and/or a computer having mobile terminal functionality. For example, the UE or mobile terminal may also be a portable, pocket, hand-held, computer-embedded, or car-mounted mobile device and perform voice signaling and/or data exchanges with the RAN.
The NN 110 includes one or more processors 120, one or more memories 125, and one or more transceivers 130, interconnected by one or more buses 127. Each of the one or more transceivers 130 includes a receiver Rx 132 and a transmitter Tx 133. The one or more buses 127 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, an optical fiber, or other optical communication device, or the like. One or more transceivers 130 are connected to one or more antennas 128. The one or more memories 125 include computer program code 123. The NN 110 includes a CBG module 140 that includes one or both of the portions 140-1 and/or 140-2, which may be implemented in a variety of ways. The CBG module 140 may be configured to cause the NN 110 to perform operations in accordance with example embodiments of the invention disclosed herein. The CBG module 140 may be implemented in hardware as CBG module 140-1, such as part of one or more processors 120. The CBG module 140-1 may also be implemented as an integrated circuit or by other hardware, such as a programmable gate array. In another example, CBG module 140 may be implemented as CBG module 140-2, which is implemented as computer program code 123 and executed by one or more processors 120. For example, the one or more memories 125 and the computer program code 123 may be configured, with the one or more processors 120, to cause the NN 110 to perform one or more of the operations as described herein. The NN 110 communicates with the RAN node 170 and/or NN 90 via wireless links 111 and/or links 176 and/or links 81.
The RAN node 170 is a network node, such as a base station, that provides access to the wireless network 100 by wireless devices, such as the NN 110. RAN node 170 may be, for example, a base station for 5G, also referred to as a New Radio (NR). In 5G, the RAN node 170 may be a NG-RAN node, which is defined as a gNB or NG-eNB. RAN node 170 includes one or more processors 152, one or more memories 155, one or more network interfaces (N/WI/F)161, and one or more transceivers 160, interconnected by one or more buses 157. Each of the one or more transceivers 160 includes a receiver Rx 162 and a transmitter Tx 163. One or more transceivers 160 are connected to one or more antennas 158. The one or more memories 155 include computer program code 153.
The RAN node 170 comprises a CBG module 150, the CBG module 150 comprising one or both of the parts 150-1 and/or 150-2, which may be implemented as a side-chain relay for side-chain communication between communication devices of a network according to an example embodiment of the present invention. The CBG module 150 may be configured to cause the RAN node 170 to perform operations in accordance with example embodiments of the present invention as disclosed herein. The CBG module 150 may be implemented in hardware as CBG module 150-1, such as part of one or more processors 152. CBG module 150-1 may also be implemented as an integrated circuit or by other hardware, such as a programmable gate array. In another example, CBG module 150 may be implemented as CBG module 150-2, implemented as computer program code 153, and executed by one or more processors 152. For example, the one or more memories 155 and the computer program code 153 are configured, with the one or more processors 152, to cause the RAN node 170 to perform one or more of the operations as described herein.
Similarly, the NN 90 is a network node, such as, for example, another user device or an access device (such as a base station). The NN 90 includes one or more processors 75, one or more memories 71, one or more network interfaces (N/W I/F)80, although not shown, it is noted that (N/W I/F)80 of the NN 90 includes one or more transceivers, which are interconnected by one or more buses 85. Further, the NN 90 has one or more transceivers, each connected to an antenna, and including a receiver Rx and a transmitter. One or more transceivers of the NN 90 are connected to one or more antennas. For example, one or more transceivers of the NN 90 may be implemented as Remote Radio Heads (RRHs). The one or more memories 71 include computer program code 73 and are executed by the at least one or more processors 75.
The NN 90 includes a CBG module 50 that includes one or both of the portions 50-1 and/or 50-2, which may be implemented in a variety of ways. The CBG module 50 may be configured to cause the NN 90 to perform operations in accordance with example embodiments of the invention disclosed herein. The CBG module 50 may be implemented in hardware as a CBG module 50-1, such as part of one or more processors 75. The CBG module 50-1 may also be implemented as an integrated circuit or by other hardware, such as a programmable gate array. In another example, the CBG module 50 may be implemented as a CBG module 50-2, which is implemented as computer program code 73 and executed by one or more processors 75. For example, the one or more memories 71 and the computer program code 73 are configured, with the one or more processors 75, to cause the NN 90 to perform one or more of the operations as described herein.
One or more network interfaces N/W I/F161 and 80 may communicate over a network, such as via links 176 and/or 81. Two or more RAN nodes, such as the RAN node 170, communicate and/or the NN 90 may use, for example, the links 176 or 81. The link 176 may be wired or wireless or both, and may implement, for example, an Xn interface for 5G, an X2 interface for LTE, or other suitable interfaces for other standards.
One or more buses, such as one or more buses 157 of the RAN node 170 and/or one or more buses of the NN 90, may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, an optical fiber or other optical communication device, a wireless channel, or the like. For example, the one or more transceivers 160 may be implemented as Remote Radio Heads (RRHs), such as RRHs 195 for LTE or gNB for 5G, where other elements of the RAN node 170 may be physically located at a different location than the RRHs, and the one or more buses 157 may be implemented in part as, for example, fiber optic cables or other suitable network connections to connect the RAN node 170 or other elements of the NN 90 to the RRHs, such as the RRHs 195.
Further, the RAN node 170 may include a gNB node for providing NR user plane and control plane protocol terminations to UEs and connected to the 5GC (e.g., network element(s) 190) via an NG interface. Further, the RAN node 170 may comprise an NG-eNB node for providing E-UTRA user plane and control plane protocol terminations towards the UE and connected to the 5GC via an NG interface.
Note that the description herein indicates that "cells" perform functions, but it should be clear that the base stations forming the cells will perform these functions. The cells form part of a base station. That is, each base station may have multiple cells. For example, there may be three cells for a single carrier frequency and associated bandwidth, each covering one third of a 360 degree area, with the coverage area of a single base station covering an approximately elliptical or circular shape. Further, each cell may correspond to a single carrier, and a base station may use multiple carriers. Thus, if there are three 120 degree cells and two carriers per carrier, then there is more than one cell for the base station. It is further noted that a single cell may have multiple transmission reception points (TRxP or TRP) which are used to form the cell.
Wireless network 100 may include network element 190 or an element that may include core network functionality and which provides connectivity to another network, such as a telephone network and/or a data communications network (e.g., the internet), via at least one link 181 or link 176 or link 131. Such core network functions for 5G may include access and mobility management function(s) (AM) and/or user plane function(s) (UPF) and/or session management function(s) (SMF).
Such core network functions by network element 190 may include MME (mobile management entity)/SGW (serving gateway) functions for LTE and similar functions for 5G. These are merely exemplary functions that may be supported by the network element(s) of network 100, and note that both 5G and LTE functions may be supported. The RAN node 170 is coupled to the network element 190 via a link 131, and the NN 90 is connected to the network element 190 via a link 181. Link 131 and/or link 181 may be implemented as, for example, an NG interface for 5G, or an S1 interface for LTE, or other suitable interface for other standards. Network element 190 includes one or more processors 175, one or more memories 171, and one or more network interfaces (N/WI/F)180, which are interconnected via one or more buses 185. The one or more memories 171 include computer program code 173. The one or more memories 171 and the computer program code 173 are configured, with the one or more processors 175, to cause the network element 190 to perform one or more operations, such as operations according to example embodiments of the invention described herein.
Wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functions into a single, software-based management entity, a virtual network. Network virtualization involves platform virtualization, often combined with resource virtualization. Network virtualization is external, combining many networks or parts of networks into one virtual unit, or internal, providing network-like functionality to software containers on a single system. Note that the virtualized entities resulting from network virtualization still use hardware to some extent (such as processors 152 and/or 75 and/or 175 and memories 155 and/or 71 and/or 171), and that such virtualized entities create technical effects.
The computer- readable memories 125, 155, 171 and 71 may be of any type suitable to the local technical environment, and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The computer readable memories 125, 155, 171 and 71 may be means for performing a storage function. Processors 120, 152, 175, and 75 may be of any type suitable to the local technical environment, and may include one or more of the following, as non-limiting examples: general purpose computers, special purpose computers, microprocessors, Digital Signal Processors (DSPs) and processors based on a multi-core processor architecture. The processors 120, 152, 175, and 75 may be components for performing functions, such as controlling the NN 110, the RAN nodes 170, the NN 90, and other functions described herein.
In general, the various embodiments of the user device 110 can include, but are not limited to, cellular telephones such as smart phones, tablets, Personal Digital Assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, internet appliances (including internet of things appliances) that allow wireless internet access and possible browsing, tablets having wireless communication capabilities, and portable units or terminals that incorporate such functions.
Note that at least three UEs (UE-1, UE-2, and UE-3) may be assumed here, where UE-1 performs HARQ-based sidelink transmission of packet transport blocks to UE-2 while reserving resources for a potential next retransmission. UE-2 then transmits the HARQ feedback channel PSFCH to UE-1 based on the packet decoding result. Based on the CBG-based HARQ feedback, UE-1 may retransmit on part of the reserved resources and release other unused reserved resources. UE-3, which is sensing the sidelink channel, monitors the transmission between UE-1 and UE-2 and may utilize the reserved resources released by UE-1/UE-2 for its own sidelink transmission.
FIG. 1A shows a flow diagram of an example embodiment of the invention. As shown in FIG. 1A, there is UE-1110, UE-290 and UE-380.
As shown in fig. 1A, at step 115, UE-1 determines that a packet (e.g., a transport block) is available for transmission to UE-2. As shown in step 120 of fig. 1A, the UE-1110 determines the code block group(s) (CBG) number according to the packet size or code block number/size. As shown in step 125 of fig. 1A, UE-1110 generates information including: side link control information (SCI) indicating that hybrid automatic repeat request (HARQ) feedback is enabled, CBG-related information, and resource reservation information for retransmission. In step 130 of fig. 1A, UE-1110 performs sidelink transmissions to UE-290 with resource reservation for retransmission indicated by a sidelink control channel, the sidelink transmissions including sidelink control channel transmissions and sidelink shared channel transmissions. The UE-380 monitors at least the side link control channel. UE-3 decodes the PSCCH and the Side Link (SL) measurements for SL channel sensing, as shown in step 140. As shown in step 135 of fig. 1A, the UE-2 decodes the sidelink control channel PSCCH and the sidelink shared channel PSCCH, and in step 145 of fig. 1A, the UE-290 generates Sidelink Feedback Control Information (SFCI) and Physical Sidelink Feedback Channel (PSFCH) information from the decoding result of the PSCCH and HARQ information obtained from the decoded sidelink control information. In step 150 of fig. 1A, UE-290 transmits a PSFCH including CBG-based HARQ feedback to UE-1110. In this step 150, the UE-380 also monitors this information. UE-3 decodes the PSFCH to monitor HARQ feedback from UE-290, as shown in step 155. UE-1110 generates the PSCCH/PSCCH for retransmission of the negatively acknowledged CBG(s), as shown in step 165. UE-1110 then sends the retransmission on at least part of the reserved resources. Based on the monitored feedback, the UE-380 determines that at least part of the reserved resources are implicitly released and can be used by the UE-380 for Transmission (TX), as shown at step 160.
Further, example embodiments of the present invention include:
step 1: at the sidelink transmitter (e.g., UE-1), the following operations are performed to (re) transmit the packet Transport Block (TB) to the target receiver UE-2.
-if it is the initial transmission of a TB, UE-1 determines the Code Block Group (CBG) number for the TB, e.g. using one of the following methods:
determine CBG number from TB size;
the CBG number is determined according to the number and/or size of code blocks of the TB.
The threshold parameters relevant here (for TB size or number/size of code blocks) may be predefined or (pre-) configured by the network.
Note that the CBG number determined in the initial transmission is reused in the retransmission. According to an example embodiment of the invention:
UE-1 indicates the CBG number and CBG transmission information (CBGTI) in the Sidelink Control Information (SCI) transmitted by the sidelink control channel PSCCH and associated with the sidelink shared channel PSCCH for TBs (e.g. a bitmap indicating the presence or absence of the corresponding CBG(s) in this transmission, which is typically set to all 1's for the initial transmission for TB).
Note that including the CBG number and CBGTI in the SCI enables other sensing UEs (e.g., UE-3) to know the HARQ related parameters and to know and monitor the HARQ feedback from UE-2.
UE-1 also indicates a resource reservation for the next possible retransmission of the TB, the reserved resource size corresponding to the number of CBGs transmitted in this transmission (e.g. the initial transmission reserved resources corresponding to all CBGs).
Reserved resources for retransmission may be scheduled by the gNB (in resource allocation mode 1) or autonomously selected by the UE based on sensing of the contralateral link channel (in resource allocation mode 2).
UE-1 configures the other parameters of the SCI and generates PSCCH and pscsch, which are finally transmitted to the target receiver UE-2.
Step 2: at the side link receiver UE-2,
it decodes the PSCCH and the associated PSCCH.
Based on the decoding result and HARQ parameters (e.g. CBG number and CBGTI), UE-2 transmits CBG-based HARQ feedback to UE-1 on the sidelink feedback channel PSFCH. Note that this PSFCH may also be monitored by other sensing UEs (such as UE-3), so that UE-3 may derive information about resource release based on the monitored PSFCH from UE-2 and resource reservation information from UE-1. Thus, UE-3 may use the released reserved resources for its sidelink transmissions. Note that the rule for the release of reserved resources is shown in step 3.
Step 3, then, at the side link transmitter UE-1, there are:
based on CBG based HARQ feedback from UE-2, if there is one or more CBGs that UE-2 did not decode correctly and the number of TBs transmitted does not reach a maximum number, e.g. 4, UE-1 determines (part of) resources on reserved resources and performs TB retransmission on these resources, as in step 1; otherwise (re) transmission of the TB is completed. Other reserved resources will be implicitly released under the assumption of step 2. The rules for selecting partial resources for retransmission and releasing other resources are described below; and
if partial CBGs are to be retransmitted (i.e. 1< number of CBGs to be retransmitted < number of CBGs transmitted in last transmission), then the retransmission occupies the part of the resources reserved for the last transmission and the other reserved resources are released. The use of partial resources and the release of other reserved resources may be achieved by using at least one of the following methods:
method-1: the resources are released only in the time domain, i.e. the retransmission occupies resources on only the first specific number of slots and releases reserved resources on other slots. Obviously, this method is only suitable for timeslot aggregation sidelink transmission;
method-2: releasing resources only in the frequency domain, i.e. the retransmission uses only a first specific number of reserved sub-channels and releases other sub-channels;
method-3: resource release in time and frequency domains (e.g., first in time and then in frequency); and/or
Method-4: there is no resource release, which means that the retransmission occupies all the reserved resources, although the number of CBGs to retransmit is small. In this case, a more robust MCS scheme with better reliability is used at the cost of not releasing resources.
Note that although the above steps are numbered, the numbering does not limit the operations to any particular order. Further, any numbering or lettering or designation of any step or operation disclosed herein is not limited to the order of such steps or operations, and any such steps or operations may be performed in a different order than may be indicated by the numbering or lettering or designation of steps disclosed herein.
The following operation assumes that UE-1 has a new packet TB to transmit to the target receiver UE-2.
First, assumptions for packet size, sidelink transport format and allocated resources (in mode 1 or mode 2) are determined as follows:
[1] packet TB size: 2017 bytes (i.e., 16136 bits);
[2] SL transmission format: single data layer, 16QAM, code rate 0.43, (IMCS of table 5.1.3.1-1 of 3GPP TS38.214 ═ 12); and
[3] resource allocation: 40 PRBs over 2 slots (consecutive in both time and frequency)
Based on the specification on LDPC base selection (TS38.212), LDPC base 1 is selected for a packet. For base fig. 1, the maximum code block size is 8448 according to TS 38.212.
According to the rule of code block segmentation specified in TS38.212, the number of code blocks is determined as follows
Figure BDA0003521741500000181
Fig. 1B shows a table with transport block sizes, code block group numbers and associated values of control information bits for operation in accordance with an example embodiment of the present invention. In this table of fig. 1B, it is assumed that the CBG number is determined based on the TB size as follows (as an example).
As shown in fig. 1B, an association that may be established between a TB Size (TBs) and a CBG number in bytes and control information bits is shown, according to an example embodiment of the present invention.
In addition, as described above, the packet TB size is assumed to be 2017 bytes. Thus, from the above table, the CBG number is determined to be 2.
The two code blocks are distributed into two CBGs, each containing one code block, according to the rules for grouping code blocks into code block groups specified in TS38.214 (section 6.1.5).
As described above, it is assumed that the resources allocated for initial transmission of a TB (mode 1 or mode 2) comprise 40 consecutive PRBs over 2 consecutive slots, while another resource of 40 PRBs over 2 future slots is for a potential retransmission option (the reservation of this resource is indicated by the SCI of the initial transmission).
At least the following control information fields are included in the SCI of the initial transmission.
Aa CBG number: 01 (i.e., CBG number 2 is indicated according to fig. 1B);
-CBG transmission information (CBGTI): 11 (bitmap with length CBG number, indicating the presence or absence of CBG in the current (re-) transmission, where "11" indicates that there are two CBGs in the initial transmission); and
-resource reservation for potential retransmissions: indicating reserved resources of 40 PRBs over 2 slots.
Note that other control information fields that are less relevant to the present invention are omitted in the description.
After physical layer processing of SCI and packet TB, UE-1 generates sidelink physical channels PSCCH and transmits them to the target receiver UE-2 on the allocated resources of 2 PRBs over 2 slots.
Assuming that the target receiver UE-2 successfully decodes the PSCCH and based on the control information, the receiver then attempts to decode the associated PSCCH, with the result that the first code block is decoded correctly and the second code block is decoded incorrectly. Based on this result, UE-2 transmits Sidelink Feedback Control Information (SFCI) "10" (indicating ACK for the 1 st CBG and NACK for the 2 nd CBG) to UE-1 on the sidelink feedback channel PSFCH.
It may be assumed that the PSFCH is correctly detected by UE-1 and another sensing UE (e.g., UE-3). Note that it is assumed that UE-3 also decodes the PSCCH from UE-1 during the sensing process so that UE-3 knows the resources reserved by UE-1 for its potential retransmissions. Thus, based on the detected PSFCH and resource reservation information, UE-3 can derive information which part of the reserved resources will be used for retransmission by UE-1 and which part of the reserved resources will be implicitly released by UE-1. Based on this, the UE-3 can utilize the resources released by the UE-3 for its sidelink transmissions.
At UE-1, it is assumed that it correctly detects the PSFCH from UE-2 and knows that the second CBG was not decoded by the target receiver. In this case, UE-1 would select a partial resource instead of the resource reserved in the previous transmission and release the other resources. UE-1 may shrink resources reserved for retransmission in the frequency and/or time domain.
Reserved resources in puncturing frequency:
in this case, of the 40 PRBs reserved on 2 slots, UE-1 may use the partial reserved resources of the first 20 PRBs on 2 slots for retransmission of the second CBG of the TB. In this case, the other resources of 20 PRBs over 2 slots would be implicitly released.
In the retransmission of the 2 nd CBG of the TB, the relevant control information in the SCI is configured as follows:
-CBG number: 01 (i.e., indicating CBG number 2, same as initial transmission);
-CBG transmission information (CBGTI): 01 (a bitmap with a length of CBG number indicating the presence or absence of a CBG in the current (re-) transmission, and "01" here indicates that only the second CBG is transmitted in this re-transmission); and
reserved resources for potential further retransmissions (if the maximum number of transmissions has not been reached): indicating reserved resources of 20 PRBs over 2 slots.
After physical layer processing of SCI and packet TB, UE-1 generates sidelink physical channels PSCCH and PSCCH for retransmission and transmits them to the target receiver UE-2 on a resource of 20 PRBs over 2 slots.
Fig. 2 illustrates transmission and retransmission operations of reserved resources that are punctured on a portion of the reserved resources or in frequency, according to an example embodiment of the present invention.
As shown in step 205 of fig. 2, there is a 2-slot aggregation of the initial transmission of resource allocation 225 for the initial transmission. Item 210 indicates that the transmission has a CBG (code block group) number equal to 2 and a CBGTI (code block group transmission information) equal to 11. Item 230 of fig. 2 indicates that one subchannel of resource allocation is equal to 10 PRBs. In step 220 of fig. 2, there is a reservation of resources for potential retransmissions. In step 215 of fig. 2, there is a PSFCH associated with the sidelink initial transmission indicating that the first chunk was successfully decoded and the second chunk was not successfully decoded. This implicitly indicates the release of the second half of the reserved resources, as shown in step 250. After the retransmission in step 235, CBG number equal to 2 and CBGTI equal to 01 are indicated. Including resource reservations 245 for potential retransmissions. At step 240 of fig. 2, there is a PSFCH associated with the sidelink retransmission indicating that the retransmitted group of code blocks was successfully decoded, which implicitly implies a release of reserved resources, as shown at step 255. As shown in fig. 2, PSCCH, pscsch, PSFCH and released resources are indicated by different filling patterns.
Reserved resources in the contraction time:
in this case, of the 40 PRBs reserved on the 2 slots, UE-1 may use a partial reserved resource of all 40 PRBs on the first slot of the reserved 2 slots for retransmission of the second CBG of the TB. In this case, the other resources of 40 PRBs on the 2 nd slot will be implicitly released.
In the 2 nd CBG retransmission of the TB, the relevant control information in the SCI is configured as follows:
-CBG number: 01 (i.e., indicating CBG number 2, same as initial transmission);
-CBG transmission information (CBGTI): 01 (a bitmap with a length of CBG number indicating the presence or absence of a CBG in the current (re-) transmission, and "01" here indicates that only the second CBG is transmitted in this re-transmission); and/or
Resource reservation for potential further retransmissions (if the maximum number of transmissions has not been reached): indicating reserved resources of 40 PRBs on a single slot.
After physical layer processing of SCI and packet TB, UE-1 generates sidelink physical channels PSCCH and PSCCH for retransmission and transmits them to the target receiver UE-2 on a resource of 40 PRBs on a single slot.
Fig. 3 illustrates sidelink transmission and retransmission operations on partially reserved resources, and shrinking reserved resources in time, according to an example embodiment of the present invention.
As shown in item 305 of fig. 3, there is a 2-slot aggregation for the initial transmission, a resource allocation 325 for the initial transmission. Item 310 indicates that the transmission has a CBG (code block group) number equal to 2 and a CBGTI (code block group transmission information) equal to 11. Item 330 of fig. 3 indicates that one subchannel of resource allocation is equal to 10 PRBs. In step 320 of fig. 3, there is a reservation of resources for potential retransmissions. In step 315 of fig. 3, there is a PSFCH associated with the sidelink initial transmission indicating that the first chunk was successfully decoded and the second chunk was not successfully decoded. This implicitly indicates that the second half of the resources are reserved, as shown in step 350. After retransmission at step 335, the CBG number is indicated to be equal to 2 and the CBGTI equal to 01. Including resource reservations 345 for potential retransmissions. In step 340 of fig. 3, there is a PSCCH associated with a sidelink retransmission indicating that the decoding of the retransmitted group of code blocks was successful, which implicitly implies the release of reserved resources, as shown in step 355. Similar to fig. 2, the PSCCH, PSFCH and released resources are indicated by different filling patterns as shown in fig. 3.
Additional rules for shrinking reserved resources for retransmissions
In the current (re-) transmission, it is assumed that the allocated resources span NslotN on successive time slotssubchA number of consecutive sub-channels. It is also assumed that the current (re-) transmission has the same dimensioned size of resources for potential further retransmissions. Let cbgti (i), i ═ 1, 2CBGA bitmap indicating CBG transmission information, wherein 1 indicates the existence of CBG, and0 means that there is no current (re-) transmission. Where N isCBGIndicates the number of CBGs. Meanwhile, assume cbgfi (i), i ═ 1, 2CBGA bitmap representing CBG-based HARQ feedback information associated with cbgti (i), where 1 represents NACK for the corresponding CBG and 0 represents ACK for the corresponding CBG.
Based on CBG based HARQ feedback, the further retransmissions will occupy (part of) the reserved resources, wherein the resource size is determined by at least one of the following three methods:
method-1: resource puncturing over frequency only
In this case, the resources for retransmission will potentially shrink only in the frequency domain, and the reserved resources in the time domain remain unchanged. The resource size for retransmission may be determined as follows:
Figure BDA0003521741500000221
method-2: resources shrink only in time
In this case, the resources for retransmission will potentially shrink only in the time domain and the reserved resources in the frequency domain remain unchanged. The resource size for retransmission may be determined as follows:
Figure BDA0003521741500000231
where S isSARepresenting the set of allowable numbers of aggregated slots. For example, SSA(1, 2, 4, 8). In another example, SSA＝(1，2，3，4，5，6，7，8)。
Method-3: resource contraction in time and frequency
In this case, the resources for retransmission would potentially be punctured first in the time domain and then optionally in the frequency domain. The resource size for retransmission may be determined as follows:
Figure BDA0003521741500000232
note that the method used for reserved resource contraction for retransmissions may be predefined in the system specification or (pre-) configured, e.g. in resource pool configuration signaling, so that the method used is not only known to the sidelink transmitter and receiver(s), but also to other UEs that are sensing sidelink channels.
In the example shown in fig. 2 disclosed herein, method-1 is used, whereas in the example shown in fig. 3 disclosed herein, method-2 is used (note that in the particular case of an example, method-3 is equivalent to method-2).
Fig. 4 illustrates communication operations associated with three vehicles (or UEs) according to an example embodiment of the present invention. As shown in item 410 of fig. 4, abbreviations and features associated with example embodiments of the present invention are indicated. These features of item 410 of FIG. 4 include SCI: side link control information, SFCI side link feedback control information, PSCCH: physical side link control channel, psch: physical side link shared channel, PSFCH: physical side link feedback channel, reTX: retransmission, CBG: code block group and CBGTI: the CBG transmits information.
With respect to fig. 4, item 420 shows an overview of the steps associated with the communication between UE-1 and UE-2 of fig. 4. This overview of item 420 includes SCI representing control information typically conveyed by the physical side link control channel (PSCCH). The PSCCH is transmitted along with the data channel PSCCH. Further, the summary of item 420 indicates that the SCI includes at least 1) a CBG number; 2) CBGTI, 3) resource reservation information for the reTX, and the SCI may further include information indicating how to release unused reserved resources in the next reTX.
The communication between UE-1 and UE-2 as in fig. 4 includes 1) initial TX (PSCCH/PSCCH) from UE-1 to UE-2; then there is 2) CBG based HARQ feedback (PSFCH) from UE-2 to UE-1; and there is 3) retransmission (PSCCH/PSCCH) from UE-1 to UE-2. As also shown in fig. 4, UE-3 monitors at least these PSCCH/PSFCH communications for channel sensing and resource selection for its own sidelink transmission.
Fig. 6A illustrates operations that may be performed by a network device, such as, but not limited to, a network device, such as the NN 110 and/or NN 90 in fig. 5. As shown in step 610 of fig. 6A, sidelink transmissions towards a second communication device are performed by a first communication device for transport blocks associated with sidelink transmissions using resource reservation. Then, as shown in step 620 of fig. 6A, in response to receiving hybrid automatic repeat request (HARQ) feedback for the side link transmission, at least primary side link retransmission is performed for the code block group of the negatively acknowledged transport block using some or all of the reserved resources of the resource reservation.
According to an example embodiment described in the preceding paragraph, wherein the sidelink transmissions comprise: a sidelink control channel transmission that conveys sidelink control information associated with the sidelink transmission; and sidelink shared channel transmission, conveying code blocks associated with the transport blocks.
According to an example embodiment described in the preceding paragraph, wherein performing sidelink transmissions comprises: determining a code block segmentation of a transport block; determining a number of code block groups associated with code blocks obtained by the code block segmentation; and determining reserved resources for retransmission of the group of code blocks of the transport block.
According to an example embodiment described in the preceding paragraph, wherein performing sidelink transmissions further comprises: setting a code block group correlation information field in sidelink control information based on the determined code block segmentation and transport block code block group number associated with the transport block; and setting a resource reservation related information field in the sidelink control information based on the determined reserved resources for potential retransmissions associated with the transport block; generating a side link control channel and a side link shared channel; and transmitting the sidelink control channel and the sidelink shared channel for sidelink transmission on the sidelink towards the second communication device.
According to an example embodiment described in the preceding paragraph, wherein the hybrid automatic repeat request feedback comprises: hybrid automatic repeat request feedback information based on the set of code blocks, received from the second communication device on a sidelink feedback channel from the second communication device.
According to an example embodiment described in the above paragraph, wherein determining the number of code block groups associated with the code blocks obtained by the code block segmentation comprises at least one of: determining a number of code block groups based on the total number of code blocks and the code block size; or the number of code block groups is determined based on the transport block size.
According to an example embodiment as described in the previous paragraph, wherein the code block group correlation information field of the sidelink control information comprises: code block group numbers corresponding to the determined number of code block groups of the associated transport block; and the code block includes code block group transmission information of a bitmap identifying code block group numbers, the bitmap indicating presence or absence of a corresponding code block group in a current sidelink transmission.
According to an example embodiment as described in the preceding paragraph, wherein the resource reservation related information field of the sidelink control information comprises at least one of: information on at least one resource reservation in a time domain, the time domain comprising one or more time slots; or information on at least one resource reservation in a frequency domain, the frequency domain including one or more subchannels.
According to an example embodiment as described in the preceding paragraph, wherein performing at least primary-side link retransmission for a code block group of a negatively acknowledged transport block using reserved partial or full reserved resources comprises: side link retransmission is performed for the negatively acknowledged code block group on some or all of the reserved resources in the time domain using some or all of the reserved resources in the frequency domain.
A non-transitory computer readable medium storing program code, the program code being executed by at least one processor to perform at least the method as described in the preceding paragraph.
In another example aspect of the invention, there is an apparatus comprising: means for performing, by the first communication device, a sidelink transmission towards the second communication device for a transport block associated with the sidelink transmission using the resource reservation; means for performing, by a first communication device (e.g., NN 110 or NN 90 in fig. 5), sidelink transmissions towards a second communication device (e.g., NN 110 or NN 90 in fig. 5) using resource reservation for transport blocks associated with sidelink transmissions (e.g., as one or more transceivers 130 or one or more network interfaces (one or more transceivers 130 or N/WI/F)80, memory(s) 125 or one or more memories 71, computer program code 123, or computer program code 73, and processor(s) 120 or processor(s) 75, CBG module 140-1 and/or CBG module 140-2, or CBG module 50-1 and/or CBG module 50-2 in fig. 5); and means for performing (e.g., one or more transceivers 130 or N/WI/F80, memory(s) 125 or memory(s) 71, computer program code 123 or computer program code 73, and processor(s) 120 or processor(s) 75, CBG module 140-1 and/or CBG module 140-2 or CBG module 50-1 and/or CBG module 50-2) at least primary side link retransmission for a negatively acknowledged transport block group using some or all of the reserved resources of the resource reservation in response to receiving hybrid automatic repeat request (HARQ) feedback for the sidelink transmission(s).
In an example aspect of the invention according to the above paragraph, wherein at least the means for performing and determining as described above comprises a non-transitory computer readable medium [ such as the memory(s) 125 and/or the memory(s) 71 in fig. 5 ], encoded with a computer program [ such as the computer program code 123 and/or the computer program code 73 in fig. 5 ], executable by at least one processor [ such as the processor(s) 120 or the processor(s) 75 in fig. 5, the CBG module 140-1, and/or the CBG module 140-2 or the CBG module 50-1, and/or the CBG module 50-2 ].
Fig. 6B illustrates operations that may be performed by a network device, such as but not limited to a network device such as RAN node 170 in fig. 5. As shown in step 650 of fig. 6B, a sidelink control channel for sidelink transmissions from the first communication device is monitored by the third communication device. As shown in step 660 of fig. 6B, a sidelink feedback channel is monitored for feedback of sidelink transmissions from the second communication device. Resource selection is then performed for sidelink transmissions based on monitored parameters from the sidelink control channel and the sidelink feedback channel related to sidelink retransmissions, as shown in step 670 of fig. 6B.
According to an example embodiment described in the previous paragraph, wherein the parameters comprise information of reserved resources used for sidelink transmission and feedback.
According to an example embodiment described in the above paragraph, wherein the third communication device derives from the parameters part or all of the resources to be used for sidelink retransmissions and the remaining resources to be implicitly released.
According to an example embodiment described in the preceding paragraph, wherein the monitoring comprises decoding the sidelink control channel and obtaining the resource reservation information code block for sidelink retransmission from code block group related information in the sidelink control information.
According to an example embodiment as described above, wherein the processing comprises: and detecting a side link feedback channel, and acquiring hybrid automatic repeat request feedback information based on the code block group from the side link feedback control information.
According to an example embodiment described in the preceding paragraph, wherein performing resource selection for sidelink transmission comprises: in view of the resource selection for sidelink transmission, at least one of the following is effectively reserved: the first communication device reserves resources, resources monitored by the third communication device, and resources to be used by a plurality of negatively acknowledged code block groups indicating code blocks by hybrid automatic repeat request feedback based on the code block groups, and wherein any remaining reserved resources are implicitly released.
According to an example embodiment described in the preceding paragraph, wherein the resource selection uses at least one of remaining reserved resources and unreserved resources that are implicitly released.
A non-transitory computer readable medium storing program code, the program code being executed by at least one processor to perform at least the method as described in the preceding paragraph.
In another example aspect of the invention, there is an apparatus comprising: means for monitoring (e.g., RRH 195, memory(s) 155, computer program code 153, processor(s) 152 and/or CBG module 150-1 and/or CBG module 150-2) a sidelink control channel for sidelink transmissions from the first communication device by a third communication device (e.g., NN 110 and/or NN 90); means for monitoring (e.g., one or more transceivers 130 or N/WI/F80, memory(s) 125 or memory(s) 71, computer program code 123 or computer program code 73, and processor(s) 120 or processor(s) 75, CBG module 140-1 and/or CBG module 140-2 or CBG module 50-1 and/or CBG module 50-2 in fig. 5) a sidelink feedback channel for feedback of a contralateral link transmission from a second communication device; and means for performing resource selection (e.g., as one or more transceivers 130 or N/WI/F80, memory(s) 125 or memory(s) 71, computer program code 123 or computer program code 73, and processor(s) 120 or processor(s) 75, CBG module 140-1 and/or CBG module 140-2 or CBG module 50-1 and/or CBG module 50-2 in fig. 5) for sidelink transmissions based on monitored parameters related to sidelink retransmissions from a sidelink control channel and a sidelink feedback channel.
In an example aspect of the invention according to the above paragraph, wherein at least the means for monitoring and executing comprises a non-transitory computer readable medium [ such as memory(s) 125 or memory(s) 71 in fig. 5 ], encoded with a computer program [ such as computer program code 123 or computer program code 73 in fig. 5 ], executable by at least one processor [ such as processor(s) 120 or processor(s) 75 in fig. 5, CBG module 140-1, and/or CBG module 140-2 or CBG module 50-1, and/or CBG module 50-2 ].
In general, the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto. While various aspects of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
Embodiments of the invention may be practiced in various components such as integrated circuit modules. The design of integrated circuits is by and large a highly automated process. Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.
The word "exemplary" is used herein to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. All of the embodiments described in this detailed description are exemplary embodiments provided to enable persons skilled in the art to make or use the invention and not to limit the scope of the invention which is defined by the claims.
The foregoing description has provided by way of exemplary and non-limiting examples a full and informative description of the best method and apparatus presently contemplated by the inventors for carrying out the invention. However, various modifications and adaptations may become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings and the appended claims. However, all such and similar modifications of the teachings of this invention will still fall within the scope of this invention.
It should be noted that the terms "connected," "coupled," or any variant thereof, means any direct or indirect connection or coupling between two or more elements, and the presence of one or more intervening elements may be included between two elements that are "connected" or "coupled" together. The coupling or connection between the elements may be physical, logical, or a combination thereof. As used herein, two elements may be considered to be "linked" or "coupled" together by: using one or more wires, cables and/or printed electrical connections, and by using electromagnetic energy, such as having wavelengths in the radio frequency region, the microwave region and the optical (visible and invisible) region, as a few non-limiting and non-exhaustive examples.
Furthermore, some of the features of the preferred embodiments of this invention could be used to advantage without the corresponding use of other features. Accordingly, the foregoing description should be considered as merely illustrative of the principles of the present invention, and not in limitation thereof.

Claims (35)

1. A method, comprising:
performing, by the first communication device, a sidelink transmission towards the second communication device for a transport block associated with the sidelink transmission using the resource reservation; and
performing at least primary-side link retransmission for a block group of the transport block that is negatively acknowledged using some or all of the reserved resources in response to receiving hybrid automatic repeat request (HARQ) feedback for the sidelink transmission.
2. The method of claim 1, wherein the side link transmission comprises:
a sidelink control channel transmission conveying sidelink control information associated with said sidelink transmission; and transmitting a sidelink shared channel transmission of a code block associated with the transport block.
3. The method of claim 2, wherein performing the sidelink transmission comprises:
determining a code block segmentation for the transport block;
determining a number of code block groups associated with a code block obtained by the code block segmentation; and
determining the reserved resources for the retransmission of the code block group for the transport block.
4. The method of claim 3, wherein performing the sidelink transmission further comprises:
setting a code block group correlation information field in the sidelink control information based on the determined code block segmentation and transport block code block group number associated with the transport block; and
setting a resource reservation related information field in the sidelink control information based on the determined reserved resources for potential retransmissions associated with the transport block;
generating a side link control channel and a side link shared channel; and
transmitting the sidelink control channel and the sidelink shared channel for the sidelink transmission over the sidelink towards the second communication device.
5. The method of claim 1, wherein the hybrid automatic repeat request feedback comprises:
hybrid automatic repeat request feedback information based on a code block group received from the second communication device on a sidelink feedback channel from the second communication device.
6. The method of claim 3, wherein determining the number of code block groups associated with the code block obtained by the code block segmentation comprises at least one of:
determining the number of the group of code blocks based on a total number of the code blocks and a code block size; or
Determining the number of the code block groups based on a transport block size.
7. The method of claim 4, wherein the code block group related information field of the sidelink control information comprises:
code block group numbers corresponding to the determined number of the code block groups of the associated transport block; and
code block group transmission information including a bitmap identifying code block group numbers, the bitmap indicating the presence or absence of a corresponding code block group in a current sidelink transmission.
8. The method of claim 4, wherein the resource reservation related information field of the sidelink control information comprises at least one of:
information on at least one resource reservation in a time domain, the time domain comprising one or more time slots; or
Information on at least one resource reservation in a frequency domain, the frequency domain comprising one or more subchannels.
9. The method of claim 1, wherein performing the at least primary-side link retransmission for the set of code blocks of the transport block that is negatively acknowledged using the reserved partial or full reserved resources comprises:
performing sidelink retransmission for the negatively acknowledged code block group over the partially or fully reserved resources in the time domain using the partially or fully reserved resources in the frequency domain.
10. An apparatus, comprising:
means for performing, by the first communication device, a sidelink transmission towards the second communication device for a transport block associated with the sidelink transmission using the resource reservation; and
means for performing at least primary-side link retransmission for a block group of the transport block that is negatively acknowledged using some or all of the reserved resources of the resource reservation in response to receiving hybrid automatic repeat request (HARQ) feedback for the sidelink transmission.
11. The apparatus of claim 10, wherein the side link transmission comprises:
a sidelink control channel transmission conveying sidelink control information associated with said sidelink transmission; and transmitting a sidelink shared channel transmission of a code block associated with the transport block.
12. The apparatus of claim 11, wherein performing the sidelink transmission comprises:
means for determining a code block segmentation for the transport block;
means for determining a number of code block groups associated with a code block obtained by the code block segmentation; and
means for determining the reserved resources for the retransmission of the group of code blocks for the transport block.
13. The apparatus of claim 12, wherein performing the sidelink transmission further comprises:
means for setting a code block group correlation information field in the sidelink control information based on the determined code block segmentation and code block group number associated with the transport block; and
means for setting a resource reservation related information field in the sidelink control information based on the determined reserved resources for potential retransmissions associated with the transport block;
means for generating a sidelink control channel and a sidelink shared channel; and
means for transmitting the sidelink control channel and the sidelink shared channel for the sidelink transmission over the sidelink towards the second communication device.
14. The apparatus of claim 10, wherein the hybrid automatic repeat request feedback comprises:
hybrid automatic repeat request feedback information based on a code block group received from the second communication device on a sidelink feedback channel from the second communication device.
15. The apparatus of claim 12, wherein the means for determining the number of groups of code blocks associated with the code block obtained by the code block segmentation comprises at least one of:
means for determining the number of code block groups based on a total number of the code blocks and a code block size; or
Means for determining the number of the code block groups based on a transport block size.
16. The apparatus of claim 13, wherein the code block group related information field of the sidelink control information comprises:
code block group numbers corresponding to the determined number of the code block groups of the associated transport block; and
code block group transmission information including a bitmap identifying code block group numbers, the bitmap indicating the presence or absence of a corresponding code block group in a current sidelink transmission.
17. The apparatus according to claim 13, wherein the resource reservation related information comprises at least one of:
information on at least one resource reservation in a time domain, the time domain comprising one or more time slots; or
Information on at least one resource reservation in the frequency domain on the partially or fully reserved resources in the time domain.
18. The apparatus of claim 10, wherein performing the at least primary-side link retransmission for the set of code blocks of the transport block that is negatively acknowledged using the part or all of the reserved resources of the resource reservation comprises:
performing sidelink retransmission for the negatively acknowledged code block group over part or all of the reserved resources in the time domain using part or all of the reserved resources in the frequency domain.
19. A method, comprising:
monitoring, by the third communication device, a sidelink control channel for sidelink transmissions from the first communication device;
monitoring a sidelink feedback channel for feedback from a second communication device to the sidelink transmission; and
performing resource selection for sidelink transmissions based on monitored parameters from the sidelink control channel and the sidelink feedback channel related to the sidelink retransmissions.
20. The method of claim 19, wherein the parameters comprise information of reserved resources for the sidelink transmissions and the feedback.
21. The method of claim 20, wherein the third communications device derives from the parameters the part or all of the resources to be used for sidelink retransmissions and remaining ones of the reserved resources to be implicitly released.
22. The method of claim 19, wherein the monitoring comprises:
decoding the side link control channel, and obtaining code block group related information and the resource reservation information code block for side link retransmission from the side link control information.
23. The method of claim 19, wherein the processing comprises:
and detecting the side link feedback channel, and acquiring information fed back by the hybrid automatic repeat request based on the code block group from the side link feedback control information.
24. The method of claim 21, wherein performing resource selection for the sidelink transmission comprises:
in view of the resource selection for the sidelink transmission, at least one of the following is effectively reserved:
a resource reserved by the first communication device,
a resource monitored by the third communication device, an
Resources to be used by a plurality of negatively acknowledged code block groups indicating code blocks by hybrid automatic repeat request feedback based on the code block groups, and wherein any remaining reserved resources are implicitly released.
25. The method of claim 24, wherein the resource selection uses at least one of the remaining reserved resources and unreserved resources that are implicitly released.
26. An apparatus, comprising:
means for monitoring, by a third communication device, a sidelink control channel for sidelink transmissions from a first communication device;
means for monitoring a sidelink feedback channel for feedback from a second communication device to the sidelink transmission; and
means for performing resource selection for sidelink transmissions based on monitored parameters from the sidelink control channel and the sidelink feedback channel related to the sidelink retransmissions.
27. The apparatus of claim 26, wherein the parameters comprise information of reserved resources for the sidelink transmissions and the feedback.
28. The apparatus of claim 27, wherein the third communications device derives from the parameters the part or all resources to be used for sidelink retransmission and remaining resources to be implicitly released.
29. The apparatus of claim 26, wherein the means for monitoring comprises:
decoding the side link control channel, and obtaining code block group related information and the resource reservation information code block for side link retransmission from the side link control information.
30. The apparatus of claim 26, wherein the means for processing comprises:
means for detecting the sidelink feedback channel, and means for obtaining information of hybrid automatic repeat request feedback based on a code block group from the sidelink feedback control information.
31. The apparatus of claim 28, wherein means for performing resource selection for the sidelink transmission comprises:
means for considering that at least one of the following is effectively reserved in the selection of resources for the sidelink transmission:
a resource reserved by the first communication device,
a resource monitored by the third communication device, an
Resources to be used by a plurality of negatively acknowledged code block groups indicating code blocks by hybrid automatic repeat request feedback based on the code block groups, and wherein any remaining reserved resources are implicitly released.
32. The apparatus of claim 31, wherein the resource selection uses at least one of the remaining reserved resources and unreserved resources that are implicitly released.
33. A communication system comprising an apparatus according to any of claims 10 to 18 and an apparatus according to any of claims 26 to 32.
34. A computer program comprising program code for performing the method according to any one of claims 1 to 9 or 19 to 25.
35. The computer program according to claim 34, wherein the computer program is a computer program product comprising a computer readable medium bearing computer program code embodied therein for use with a computer.
CN201980099809.5A 2019-08-28 HARQ feedback based on side link CBG and associated retransmissions on reserved resources Active CN114287115B (en)

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