CN112822778B - Method and user equipment for side-link transmission - Google Patents
Method and user equipment for side-link transmission Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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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
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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Abstract
Resource selection and data multiplexing methods for side-uplink transmission and UEs are presented. The transmitter UE may obtain a pool of resources and a resource configuration for transmitting on sidelink logical channels for NR sidelink communications, where each sidelink logical channel may be mapped to a SLRB. The transmitter UE may select a resource pool that satisfies a plurality of resource pool configuration parameters and determine a resource configuration for transmission of the transport block. The transmitter UE may perform an LCP procedure on the selected resources that meet the QoS requirements of the corresponding SLRB, wherein side uplink data is selected from the logical channel to form the transport block based on the selection of the resource pool, the resource configuration, and the joint consideration of the QoS requirements. The transmitter UE may transmit the SCI of the transport block and the transport block to the receiver UE. By utilizing the present invention, side-link transmission can be performed better.
Description
Technical Field
The present invention relates to wireless network communications, and more particularly to generation 5 (5 th Generation, 5G) resource allocation restrictions for side-link (sidelink) transmissions in a New Radio (NR) Vehicle-to-eventing, V2X wireless communication system.
Background
Third generation partnership project (3) rd Generation Partner Project,3 GPP) and Long Term Evolution (LTE) mobile telecommunications systems can provide high data rates, lower latency, and betterSystem performance. In a 3GPP LTE network, an evolved universal terrestrial radio access network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) may include a plurality of Base Stations (BSs), such as evolved Node-Bs (eNodeBs or eNBs), in communication with a plurality of mobile stations (which may be referred to as User Equipment (UEs). Because of robustness to multipath fading (robustness), higher spectral efficiency and bandwidth scalability (bandwidth scalability) of orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA) has been selected for LTE Downlink (DL) radio access schemes. Multiple access in the downlink may be implemented by allocating (assigning) different sub-bands of system bandwidth (i.e. subcarrier groups (groups of subcarriers), which may be denoted Resource Blocks (RBs)) to individual users based on the current channel state.
In order to meet the exponentially increasing demands of communication, additional spectrum (i.e., radio spectrum) is required. The number of licensed spectrums (licensed spectrum) is limited. Thus, the communications carrier needs to consider unlicensed spectrum (unlicensed spectrum) to meet this exponential increase in communications demand. The first communication link may be provided using established communication protocols such as LTE and 5G NR on licensed spectrum, and the second communication link may be provided using LTE/NR on unlicensed spectrum. In the NR Unlicensed spectrum (NR-U), any downlink and Uplink (UL) access needs to follow a (Listen-Before-Talk (LBT) channel access procedure, since Unlicensed frequencies can also be used by other networks, such as wireless fidelity (Wireless Fidelity, wi-Fi).
For an in-coverage UE, the base station may schedule data traffic over the Uu link. For out-of-coverage UEs, the UE may schedule data traffic via PC5 (or side-link). In contrast to Wi-Fi and NR-U operation, a PC5 link (or side-link) based mobile device is expected to have the following features: 1) May be deployed by both operators and users; 2) Operable in unlicensed spectrum and licensed spectrum; 3) Protocol stack complexity similar to Wi-Fi; 4) Better multiplexing efficiency than Wi-Fi; 5) Better mobility support (such as service continuity) than Wi-Fi; 6) Greater maximum transmit power than Wi-Fi for greater coverage; 7) Multi-hop relay (multi-hop relay) is supported.
In side-link communication, there are two scheduling modes, i.e. the transmission resources for the side-link communication may be selected by the network (mode 1) or by the UE itself (mode 2). Regardless of the scheduling mode in which the UE operates, the UE may first select a side-link resource and then may select data to be transmitted on the side-link resource. The selected side-link resource may determine or limit the type of data (traffic characteristics (traffic characteristic)) that may be transmitted by the side-link resource, while the selected data to be transmitted may also determine or limit the type of resources that may be used to deliver (reliver) the data. It can also be said that there are some restrictions on the transmission resources, such as whether the resource pool (resource pool) has hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) feedback resources, how much power is available for transmission, etc. There are also some limitations on the side uplink data, such as quality of service (Quality of Service, qoS) and latency requirements, priority, HARQ feedback requirements for retransmissions, etc. The UE needs to schedule resources and data so that the above-mentioned limitations can be met on both sides.
In the conventional LTE specifications, the UE first selects a side-link resource and then selects side-link data to be multiplexed (multiplexed) in the side-link resource. However, the selected data may affect the type of transmission resource that may be selected. Thus, the order in which resources are selected and data is selected may be different depending on the particular type of resource or data constraint. Thus, there is a need for a more generic model to deal with the joint constraint problem of selection resources and data. In addition to radio resource limitations and data QoS limitations, another limitation is hardware, i.e. the limited number of HARQ processes to handle transmission and reception. The problem of how the UE handles the HARQ process or buffer (buffer) starvation is not clear yet.
The present invention finds a solution.
Disclosure of Invention
A method of jointly restricting resource selection and data multiplexing on a side-uplink transmission is presented. The joint constraint method may include 4 steps A, B, C and D, and the order of the steps may be different depending on the context (e.g., depending on the particular type of resource and data constraints). In step a, the UE may select a resource pool that satisfies a particular configuration. In step B, the UE may determine resources for Transport Block (TB) transmission. In step C, the UE may perform a logical channel prioritization (Logical Channel Prioritization, LCP) process. In step D, the UE may provide information of the TBs to the receiver UE, if necessary. Under this generic model, the selection of resources and data can be jointly considered to meet both resource limitations and data QoS requirements.
In an embodiment, a transmitter UE may obtain a pool of resources and a resource configuration for transmitting on sidelink logical channels for NR sidelink communications, where each sidelink logical channel may be mapped to a SLRB. The transmitter UE may select a resource pool that satisfies a plurality of resource pool configuration parameters and determine a resource configuration for transmission of the transport block. The transmitter UE may perform an LCP procedure on the selected resources that meet the QoS requirements of the corresponding SLRB, wherein side uplink data is selected from the logical channel to form the transport block based on the selection of the resource pool, the resource configuration, and the joint consideration of the QoS requirements. The transmitter UE may transmit the SCI of the transport block and the transport block to the receiver UE.
By utilizing the present invention, side-link transmission can be performed better.
Other embodiments and advantages will be described in the detailed description that follows. This summary is not intended to define the invention. The invention is defined by the claims.
Drawings
Fig. 1 illustrates a wireless communication system supporting joint limitation of resource and data QoS requirements for side-link transmissions in accordance with novel aspects.
Fig. 2 is a simplified block diagram of a wireless transmitting device and a receiving device in accordance with the novel aspects.
Fig. 3 illustrates a timing diagram of resource selection and data multiplexing on side-uplink transmissions between a network and a transmitter UE and a receiver UE.
Fig. 4 illustrates an embodiment of deciding to enable (enable) or not enable (disable) HARQ feedback on a side-uplink transmission in accordance with the novel aspects.
Fig. 5 illustrates an embodiment of LCID selection and LCP restriction for HARQ enablement or non-enablement in accordance with the novel aspects.
Fig. 6 illustrates another embodiment of LCID selection and LCP restriction for HARQ enablement or non-enablement in accordance with the novel aspects.
Fig. 7 illustrates HARQ process occupancy (occupancy) and HARQ process release (release) for side-link transmissions in accordance with the novel aspects.
Fig. 8 is a flow diagram of a resource selection and data multiplexing method for side-link transmission in accordance with a novel aspect.
Detailed Description
Reference will now be made in detail to some embodiments of the invention, examples of which are illustrated in the accompanying drawings.
Fig. 1 illustrates a wireless communication system 100 supporting joint limitation of resource and data QoS requirements for side-link transmissions in accordance with novel aspects. The 5G NR mobile communication network 100 may include a 5G core network (5G Core network,5GC) 101, a base station gNB 102, and a plurality of user equipments UE 103, UE 104, and UE 105. For an in-coverage UE (such as UE 103), the base station may schedule sidelink resources over the Uu link for the UE to conduct sidelink communications (i.e., network scheduling); alternatively, in another resource allocation mode, the UE 103 may itself select side uplink resources for transmission (i.e., UE autonomous scheduling). For an out-of-coverage UE, such as UE 104, the UE 104 may select resources for side-link communication by itself only because scheduling from the base station is not available.
In LTE and NR networks, a physical downlink control channel (Physical Downlink Control Channel, PDCCH) may be used for DL scheduling or UL scheduling of physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) or physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) transmissions. The DL/UL scheduling information carried by the PDCCH may be referred to as downlink control information (Downlink Control Information, DCI). The DCI format may be a predefined format that may be used to form and transmit downlink control information in the PDCCH. Similarly, a physical sidelink control channel (Physical Sidelink Control Channel, PSCCH) may be used for sidelink scheduling of physical sidelink shared channel (Physical Sidelink Shared Channel, PSSCH) transmissions. The side-link scheduling information carried by the PSCCH may be referred to as side-link control information (Sidelink Control Information, SCI). SCI may be transmitted from a transmitting UE to a receiving UE on a side-link. The SCI format may be a predefined format that may be used to form and transmit side-uplink control information in the PSCCH. The DCI format and SCI format may provide scheduling details such as the number of resource blocks, resource allocation type, modulation scheme, transport block, redundancy version (redundancy version), code rate, etc. for the UE.
In side-link communication, there are two scheduling modes, i.e. the transmission resources for the side-link communication may be selected by the network (mode 1) or by the UE itself (mode 2). Regardless of the scheduling mode in which the UE operates, the UE may first select a side-link resource and then may select data to be transmitted on the side-link resource. The selected side-link resource may determine or limit the type of data (traffic characteristics) that may be transmitted by the side-link resource, while the selected data to be transmitted may also determine or limit the type of resources that may be used to deliver the data. It can also be said that there are some restrictions on the transmission resources, such as whether the resource pool has HARQ feedback resources, how much power can be used for transmission, etc. There are also some limitations on the side-uplink data, such as QoS and latency requirements, priority, HARQ feedback requirements for retransmissions, etc. The UE needs to schedule resources and data so that the restrictions can be met on both sides.
According to a novel aspect, a method of jointly restricting resource selection and data multiplexing on a side-uplink transmission is presented. In the example of fig. 1, the joint constraint method may include 4 steps A, B, C and D, and the order of the above steps may be different according to different scenarios. In step a, the UE 103 may select a resource pool that satisfies a particular configuration. In step B, the UE 103 may determine resources for Transport Block (TB) transmission. In step C, the UE 103 may perform a logical channel prioritization (Logical Channel Prioritization, LCP) process. In step D, the UE 103 may provide information of the TBs to the receiver UE, if needed. Under this generic model, the order in which resources are selected and data is selected may be different depending on the particular type of resource or data constraint. In addition to resource limitations and data QoS limitations, methods of handling HARQ processes or buffer starvation are also proposed.
Fig. 2 is a simplified block diagram 200 of wireless devices 201 and 211 in accordance with the novel aspects. For wireless device 201, such as a base station or relay (relay) UE, antennas 207 and 208 may transmit and receive radio signals. A Radio Frequency (RF) transceiver module 206 is coupled to the antenna, receives RF signals from the antenna, converts the RF signals to baseband signals, and sends the baseband signals to the processor 203. The RF transceiver module 206 also converts the baseband signal received from the processor, converts the baseband signal into an RF signal, and transmits to the antennas 207 and 208. The processor 203 processes the received baseband signal and invokes (invoke) various functional modules and circuits to perform features in the wireless device 201. The storage medium 202 may store program instructions and data 210 to control the operation of the device 201.
Similarly, for wireless device 211, such as a remote UE (remote UE), antennas 217 and 218 may transmit and receive RF signals. The RF transceiver module 216 is coupled to the antenna and is operable to receive RF signals from the antenna, convert the RF signals to baseband signals, and transmit the baseband signals to the processor 213. The RF transceiver module 216 also converts the baseband signal received from the processor, converts the baseband signal to an RF signal, and transmits to the antennas 217 and 218. The processor 213 processes the received baseband signal and invokes various functional modules and circuits to perform features in the wireless device 211. The storage medium 212 may store program instructions and data 220 to control the operation of the wireless device 211. In one embodiment, the storage medium 212 may store program instructions that, when executed by a processor, may cause the processor to perform the steps of the methods and processes of the present invention.
The wireless devices 201 and 211 may also contain a number of functional modules and circuits that may be implemented and configured to perform embodiments of the present invention. In the example of fig. 2, the wireless device 201 may be a relay UE or a transmitter UE, and the wireless device 201 may include a protocol stack (protocol stack) 222, resource management circuitry 205 for allocating and scheduling sidelink resources, LCP processing module 204 for executing sidelink LCPs, connection processing circuitry 209 for establishing sidelink connections and logical channels with remote UEs, and control and configuration circuitry 221 for providing control and configuration information. The wireless device 211 may be a remote UE or a receiver UE, and the wireless device 211 may include a protocol stack 232, a synchronization processing circuit 215, a relay discovery circuit 214 for discovering a relay UE, a connection processing circuit 219 for establishing a side-uplink connection, and a configuration and control circuit 231. The various functional modules and circuits may be implemented and configured by software, firmware, hardware, and any combination thereof.
The above-described functional modules and circuits, when executed by the processors 203 and 213 (e.g., via execution of the program code 210 and 220), may allow the relay UE 201 and the remote UE 211 to perform embodiments of the present invention accordingly. In one example, the UE 201 may obtain a resource pool and a resource configuration, and may perform resource pool selection, resource configuration determination, and LCP procedures. UE 201 may select side-uplink data from a particular logical channel to form a transport block based on joint considerations of resource pool selection, resource configuration, and QoS requirements. The transport block requires HARQ feedback if the UE finds that the highest priority side-link logical channel with data available for transmission requires HARQ feedback. If the UE finds that the highest priority side-link logical channel with data available for transmission does not require HARQ feedback, the transport block does not require HARQ feedback, so in side-link LCP, the UE may not multiplex any data requiring HARQ feedback in the same transport block as the highest priority side-link logical channel data. If the transport block is HARQ enabled, the UE may select a resource pool with HARQ feedback resources. If the transport block does not enable HARQ, the UE may select a resource pool with or without HARQ feedback resources. The UE 201 may also provide the above information to the receiver UE, e.g. an indicator that the transmitter UE may indicate the HARQ feedback enabled/disabled state of the transport block in the associated side uplink control information SCI.
Fig. 3 illustrates a timing diagram of resource selection and data multiplexing on side-uplink transmissions between a network 301 and a transmitter UE 302 and a receiver UE 303. In step 311, the network may establish a connection with the transmitter UE 302 over the Uu link. In step 312, the transmitter UE 302 may receive various broadcast (broadcast) and/or unicast (unicast) information from the network, including scheduling information and resource allocation. Note that the base station may schedule side uplink resources for the UE to perform side uplink communications (i.e., network scheduling) over the Uu link. Alternatively, the UE may select the side-uplink resources for transmission itself (i.e., UE autonomous scheduling). In step 313, the transmitter UE 302 may establish a PC 5-radio resource control (Radio Resource Control, RRC) connection with the receiver UE 303. Note that if the transmitter UE is broadcasting, the transmitter UE may not need to establish any side-uplink connection with the receiver UE before the transmitter UE sends the data. For side-link communications and QoS management, multiple side-link radio bearers (Sidelink Radio Bearer, SLRBs) may be established and each side-link radio bearer may be mapped (map) to a different side-link logical channel. In addition, each side uplink radio bearer may be mapped to one or more QoS flows (flows), where the QoS flows may define QoS requirements for the corresponding side uplink logical channels.
In NR, when a transmitter UE makes a new transmission to receiver UEs through a side uplink, the transmitter UE may construct a new transport block by multiplexing data of different logical channels from each receiver UE. The side-uplink LCP procedure may be applied whenever a new transfer is performed. The LCP process may allocate resources to meet QoS requirements based on the priority of the logical channels. In constructing a transport block with data from multiple logical channels, data from the highest priority logical channel may be serviced (served) first in the transport block, followed by data from the next highest priority logical channel, until the transport block space (space) is exhausted. The configuration of each side-link logical channel may be controlled by the network, e.g., by dedicated RRC signaling, system information, or preconfigured. In step 321, the transmitter UE 302 may allocate side-link resources and perform LCP procedures to make new side-link transmissions to the receiver UE 303. UE 302 may handle the joint limitation of transmission resources and data QoS requirements. The joint constraint method may include: a) selecting a resource pool, B) determining a resource configuration, and C) executing an LCP process, wherein the order of the above steps may be different according to different scenarios.
In step a, the UE 302 may select a resource pool that satisfies a particular configuration. The characteristics of the resource pool may include: 1) Broadcast type (cast type), such as dedicated to unicast, multicast (groupcast) or broadcast; 2) QoS specific (QoS specific) (e.g., qoS specific) priorities such as a range of side-uplink logical channel priorities, a range of PC5-5G QoS identifier (5G QoS Identifier,5QI) priorities; 3) A measured channel busy rate (Channel Busy Ratio, CBR); 4) Transmission parameters or constraints—harq maximum number of transmissions, modulation coding scheme (Modulation and Coding Scheme, MCS) level (level), applicable PSSCH frequency range, applicable slot aggregation level in the time domain (aggregation level), maximum transmission power; 5) QoS CBR-specific transfer limitations-a side-link traffic with a specific QoS may use this resource pool if the UE measured channel quality or CBR or a metric (metric) related to measured congestion (congestion) is below a threshold; 6) Whether the resource pool has HARQ feedback resource configuration. In step B, the UE 302 may determine resources for transport block transmission. UE 302 may determine the highest priority side-link data to be transmitted in the transport block or select resources that satisfy the highest priority data, such as latency performance, conservative (constant) MCS. In an embodiment, the selected resource is associated with at least one of: time-frequency domain resources, latency performance, communication range, and ability to transmit highest priority data. In step C, UE 302 may perform an LCP procedure. The UE 302 may select data into transport blocks from only some logical channels based on the constraints in the previous steps.
In step 331, UE 302 can transmit side-link control information (SCI over PSCCH) and side-link data (transport blocks over pscsch) to UE 303 over the selected side-link resources. The SCI may include signal parameters of the transport block if not implicitly indicated by the selected resource or resource pool (step D). Possible parameters include: 1) A broadcast type, minimum communication range (Minimum Communication Range, MCR) for multicast; 2) An indicator to indicate whether HARQ feedback is enabled or not, HARQ feedback mode (ACK)/NACK (Negative Acknowledgement, NACK) for multicast, or NACK only), maximum number of retransmissions; 3) Transmitting the time-frequency position of the resource; 4) A scheduling mode; and 5) priority indication.
Fig. 4 illustrates an embodiment of deciding to enable or not enable HARQ feedback on a side-uplink transmission in accordance with novel aspects. Deciding whether HARQ feedback for a transport block is enabled or disabled may comprise the steps of: b- & gt A- & gt C- & gt D. In step 411 (step B), the UE may determine the highest priority side uplink data to be included in the transport block. If the highest priority side-link data requires HARQ feedback, the transport block requires HARQ feedback; otherwise, the transport block may not need HARQ feedback. In step 421 (step a), the UE may select a (re-) resource pool. If the transport block requires HARQ feedback and if the resource pool is not configured with HARQ feedback resources (physical side uplink feedback channel (Physical Sidelink Feedback Channel, PSFCH)), the UE may reselect the resource pool configured with HARQ feedback resources. If the transport block does not require HARQ feedback, the UE may not need to change the resource pool, i.e., the UE may use resources with or without HARQ feedback resources. In step 431 (step C), the UE may perform an LCP procedure. Each side uplink logical channel may be configured with HARQ enabled or not enabled. If the transport block is configured with HARQ feedback (determined in step B), then all side uplink data contained in the transport block may be HARQ enabled. In step 441 (step D), the UE may transmit the HARQ enabled or disabled state of the transport block in the SCI over the PSCCH and transmit the transport block data over the PSSCH. The SCI may contain information on how to decode (HARQ feedback mode or option), priority, broadcast mode, source/destination Identification (ID), etc.
Fig. 5 illustrates an embodiment of Logical Channel ID (LCID) selection and LCP restriction for HARQ enablement or non-enablement in accordance with the novel aspects. For side-link communications and QoS management, multiple side-link radio bearers SLRBs may be established and each side-link radio bearer may be mapped to a different side-link logical channel. In addition, each side uplink radio bearer may be mapped to one or more QoS flows, where the QoS flows may define QoS requirements for the side uplink logical channels. Each side-link logical channel may be associated with a side-link logical channel group (Logical Channel Group, LCG). In step 511, the ue 502 may send the QoS attribute (attribute) of the new QoS flow. In step 512, the gnb 501 may send the SLRB configuration to the UE 502 in an Access Stratum (AS). The SLRB configuration may configure an associated side-link LCG for side-link buffer status reporting (Buffer Status Report, BSR) of each side-link LCG. Thus, the network may configure the SLRB ID associated with the QoS flow/attribute reported in step 512, the configuration of the (new or modified) sidelink logical channel associated with the SLRB, and the sidelink LCID associated with the sidelink logical channel. In step 521, the ue 502 itself may determine the sidelink LCID of the sidelink logical channel (new or modified). In step 531, the UE 502 may send an SLRB setup request to the UE 503 to establish an SLRB. The SLRB setup message may be carried by a PC5-RRC message for PC5-RRC reconfiguration. In the side-uplink resource selection procedure, if the UE finds that the highest priority side-uplink logical channel with data available for transmission requires HARQ feedback, the transport block requires HARQ feedback. If the UE finds that the highest priority side-link logical channel with data available for transmission does not require HARQ feedback, the transport block does not require HARQ feedback, so in side-link LCP, the UE may not multiplex any data requiring HARQ feedback in the transport block. If the next step for the UE is resource pool selection (incomplete) after side-uplink resource selection, the UE has determined that the transport block is HARQ enabled/not enabled during side-uplink LCP (side-uplink LCP has completed). If the transport block has HARQ enabled, the UE may select a resource pool with HARQ feedback resources. If the transport block does not enable HARQ, the UE may select a resource pool with or without HARQ feedback resources.
Fig. 6 illustrates another embodiment of LCID selection and LCP restriction for HARQ enablement or non-enablement in accordance with the novel aspects. In step 611, the UE 602 may send side-link UE information (sidelinkiindicated) to the gNB 601. The information may include the destination UE's ID and QoS flow ID, but may not include LCID. It can also be said that in the side-uplink UE information, UE 602 may link to the destination UE with some SLRB ID, LCG ID, or QoS Flow ID (QoS Flow ID, QFI)/PC 5-5QI (PQI), i.e., qoS information may be represented by SLRB ID or QFI/PQI (i.e., not LCID). In step 612, the gnb 601 may send the SLRB configuration to the UE 602 in the AS layer. Similar to the embodiment of fig. 5, the network may configure the SLRB ID and associated LCG ID, but UE 502 may determine the LCID by itself for SLRB establishment. The QoS information in the UE assistance information may be an LCG ID or an SLRB ID of the QoS flow ID if the network does not know the LCID associated with the SLRB.
Fig. 7 illustrates HARQ process occupancy and HARQ process release for side-link transmissions in accordance with the novel aspects. On the transmitter side, a transmitter UE may send a notification to a receiver UE if the transmitter UE moves some or all HARQ processes from the receiver UE to other destination UEs. The transmitter UE may also send a value to suspend transmission. The transmitter UE may release the HARQ process for the destination UE if one or more of the following conditions are met: 1) A period of time after the last transport block reception; 2) The link state is poor; and 3) when the PC5-RRC connection is released. On the receiver side, because the receiver UE receives the transport block from the transmitter UE, the receiver UE may release the HARQ process for the destination UE if one or more of the following conditions are met: 1) The retransmission of the transport block is ended; 2) Successfully receiving the transport block; 3) The receiver UE does not receive SCI for new transmission or retransmission from the transmitter UE for a period of time; 4) A period of time after the last transport block reception; and 5) when the receiver UE receives a flag (marker) from the transmitter UE informing the receiver UE that the HARQ process can be released under some conditions.
In the example of fig. 7, there are 5 transmitters UE. Since all the reception HARQ processes (side-link processes) are occupied by other transmitter UEs, the receiver UE cannot receive data from the transmitter UE 5. In the conventional Uu behavior, the UE does not autonomously release the HARQ process or clear the HARQ buffer. This is because in Uu, the UE has only one transmitter (gNB). Thus, the gNB can allocate new data for the occupied HARQ process, and the UE knows that the gNB wants to cover (oversteer) the occupied HARQ process with a new transport block. However, in the side-uplink, if Uu principle is followed, although the transmitter UE 1-4 has successfully transmitted transport blocks on HARQ processes 0, 4, 8, 12, these HARQ processes are still occupied by the transmitter UE 1-4, i.e. the transmitter UE 5 cannot use HARQ processes 0, 4, 8, 12 for new data transmission. In a novel aspect, when a transport block reception is successful, the receiver UE may consider the corresponding HARQ process as unoccupied, i.e. the unoccupied HARQ process may be used to receive data from other transmitter UEs. For example, assuming that data is successfully received from transmitters UE 1, 2, 3, and 4 on HARQ processes 0, 4, 8, 12, receiver UE may consider HARQ processes 0, 4, 8, 12 as unoccupied. Thus, any one of these 4 HARQ processes may be used to receive data from the transmitter UE 5.
Fig. 8 is a flow diagram of a resource selection and data multiplexing method for side-link transmission in accordance with a novel aspect. In step 801, the ue may obtain a pool of resources and resource configuration for transmission on sidelink logical channels for NR sidelink communications, where each sidelink logical channel may be mapped to a SLRB. In step 802, the ue may select a resource pool that satisfies a plurality of resource pool configuration parameters and determine a resource configuration for transmission of a transport block. In step 803, the ue may perform an LCP procedure on the selected resources that meet the QoS requirements of the corresponding SLRB, wherein side uplink data is selected from the logical channel to form the transport block based on the selection of the resource pool, the resource configuration, and the joint consideration of the QoS requirements. In step 804, the UE may transmit the SCI of the transport block and the transport block to the receiver UE.
Although the invention has been disclosed above in connection with specific embodiments for instructional purposes, the invention is not limited thereto. Accordingly, various features of the above-described embodiments may be modified, altered, and combined without departing from the scope of the invention as set forth in the following claims.
Claims (25)
1. A method for side-link transmission, comprising:
obtaining, by a transmitter user equipment, a pool of resources and a resource configuration for transmitting on sidelink logical channels for new radio sidelink communications, wherein each sidelink logical channel is mapped to a sidelink radio bearer;
selecting a resource pool satisfying a plurality of resource pool configuration parameters and determining a resource configuration for transmission of a transport block;
performing a logical channel prioritization procedure on selected resources meeting quality of service requirements of the respective side-link radio bearers, wherein side-link data is selected from the logical channels to form the transport blocks based on joint considerations of the selection of the resource pool, the resource allocation, and the quality of service requirements; and
transmitting the side-uplink control information of the transport block and the transport block to a receiver user equipment.
2. The method for side-link transmission of claim 1, wherein each side-link radio bearer is associated with one or more quality-of-service flows, wherein the quality-of-service flows define respective quality-of-service requirements.
3. The method for side-link transmission of claim 1, wherein the selection of the resource pool comprises:
consider whether to configure hybrid automatic repeat request feedback resources.
4. The method for side-uplink transmission of claim 1, wherein the resource pool configuration parameters comprise at least one of:
broadcast type, quality of service priority, channel busy rate, and transmission parameters.
5. The method for side-link transmission of claim 1, wherein the determination of the resource configuration comprises:
it is determined whether the highest priority side-uplink data requires hybrid automatic repeat request feedback.
6. The method for side-link transmission of claim 1, wherein the selected resource is associated with at least one of:
time-frequency domain resources, latency performance, communication range, and ability to transmit highest priority data.
7. The method for side-uplink transmission of claim 1, wherein the logical channel prioritization process comprises:
when the transport block is configured to enable a hybrid automatic repeat request, only side uplink data enabling the hybrid automatic repeat request is multiplexed.
8. The method for side-link transmission of claim 1, wherein the joint consideration comprises:
the selection of the resource pool, the determination of the resource configuration, and the logical channel prioritization process are performed in a different order.
9. The method for side-link transmission of claim 1, wherein the side-link control information includes a status indication indicating whether a respective transport block is enabled or not to enable hybrid automatic repeat request feedback.
10. The method for side-link transmission of claim 1, wherein the side-link control information comprises at least one of:
broadcast type, minimum communication range for multicast, indication of whether hybrid automatic repeat request feedback is enabled or not enabled, and mode of hybrid automatic repeat request feedback.
11. The method for side-link transmission of claim 1,
if the highest priority side uplink data contained in the transport block needs to be fed back by the hybrid automatic repeat request, the transport block needs to be fed back by the hybrid automatic repeat request; and
and if the highest priority side uplink data contained in the transmission block does not need the hybrid automatic repeat request feedback, and any data needing the hybrid automatic repeat request feedback is not multiplexed in the transmission block.
12. The method for side-link transmission of claim 1, wherein the transmitter user device releases the occupied respective hybrid automatic repeat request process when the transport block is successfully received by the receiver user device.
13. A user equipment for side-link transmission, for use as a transmitter user equipment, comprising:
configuration and control circuitry to obtain a pool of resources and a resource configuration for transmission on sidelink logical channels for new radio sidelink communications, wherein each sidelink logical channel is mapped to a sidelink radio bearer;
a resource management circuit that selects a resource pool satisfying a plurality of resource pool configuration parameters and determines a resource configuration for transmission of a transport block;
a logical channel prioritization module that performs a logical channel prioritization process on selected resources that meet quality of service requirements of a respective side-link radio bearer, wherein side-link data is selected from the logical channels to form the transport block based on joint consideration of the selection of the resource pool, the resource configuration, and the quality of service requirements; and
and a transmitter transmitting the side-link control information of the transport block and the transport block to a receiver user equipment.
14. The user device of claim 13, wherein each side uplink radio bearer is associated with one or more quality of service flows, wherein the quality of service flows define respective quality of service requirements.
15. The user device of claim 13, wherein the selection of the resource pool comprises:
consider whether to configure hybrid automatic repeat request feedback resources.
16. The user device of claim 13, wherein the resource pool configuration parameters comprise at least one of:
broadcast type, quality of service priority, channel busy rate, and transmission parameters.
17. The user device of claim 13, wherein the determination of the resource configuration comprises:
it is determined whether the highest priority side-uplink data requires hybrid automatic repeat request feedback.
18. The user device of claim 13, wherein the selected resource is associated with at least one of:
time-frequency domain resources, latency performance, communication range, and ability to transmit highest priority data.
19. The user device of claim 13, wherein the logical channel prioritization process comprises:
when the transport block is configured to enable a hybrid automatic repeat request, only side uplink data enabling the hybrid automatic repeat request is multiplexed.
20. The user device of claim 13, wherein the joint consideration comprises:
the selection of the resource pool, the determination of the resource configuration, and the logical channel prioritization process are performed in a different order.
21. The user device of claim 13, wherein the side uplink control information comprises a status indication indicating whether a respective transport block is enabled or not to enable hybrid automatic repeat request feedback.
22. The user device of claim 13, wherein the side-uplink control information comprises at least one of:
broadcast type, minimum communication range for multicast, indication of whether hybrid automatic repeat request feedback is enabled or not enabled, and mode of hybrid automatic repeat request feedback.
23. The user equipment of claim 13, wherein,
if the highest priority side uplink data contained in the transport block needs to be fed back by the hybrid automatic repeat request, the transport block needs to be fed back by the hybrid automatic repeat request; and
and if the highest priority side uplink data contained in the transmission block does not need the hybrid automatic repeat request feedback, and any data needing the hybrid automatic repeat request feedback is not multiplexed in the transmission block.
24. The user device of claim 13, wherein when the transport block is successfully received by the receiver user device, the occupied respective hybrid automatic repeat request process is released.
25. A storage medium storing program instructions which, when executed by a processor, cause the processor to perform the steps of the method for side-link transmission of any of claims 1-12.
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| US17/065,643 US11490365B2 (en) | 2019-11-15 | 2020-10-08 | Method to handle joint restriction of transmission resource and data QoS requirement |
| US17/065,643 | 2020-10-08 |
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| CN115811384A (en) * | 2021-09-13 | 2023-03-17 | 维沃移动通信有限公司 | Data transmission method, device, user Equipment (UE) and medium |
| CN117693997A (en) * | 2021-10-11 | 2024-03-12 | Oppo广东移动通信有限公司 | Logic channel priority ordering method, device, equipment and storage medium |
| CN116489781A (en) * | 2022-01-14 | 2023-07-25 | 展讯通信（上海）有限公司 | Carrier wave determining method and related device |
| CN116939867A (en) * | 2022-03-31 | 2023-10-24 | 索尼集团公司 | Resource selection method for side link and related equipment |
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