CN113573410B - Side link time slot configuration method and user equipment - Google Patents
Side link time slot configuration method and user equipment Download PDFInfo
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- 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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- 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
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- 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
- H04L5/0057—Physical resource allocation for CQI
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- 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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/20—Control channels or signalling for resource management
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Abstract
The embodiment of the invention provides a side link time slot configuration method and user equipment. The side link time slot configuration method provided in one embodiment includes: acquiring, by a user equipment in a wireless network, a side link (pre) configuration for side link operation by a side link, wherein the user equipment is configured with a Uu link connected with a base station in the wireless network; receiving a time division duplex uplink/downlink configuration; determining a side link time slot configuration of the side link based on the side link (pre) configuration, time division duplex uplink/downlink configuration and a reference parameter set; and performing side link transceiving through the side link based on the determined side link slot configuration. By using the present invention, the side link transceiving can be performed better.
Description
Technical Field
The present invention relates to wireless communications, and more particularly to slot configuration and resource allocation for a Side Link (SL).
Background
The 5G radio access technology will become a key component of modern access networks, which will address the high traffic growth and the increasing high bandwidth connection demands. In 3GPP New Radio (NR), SL continues to evolve. With the new functionality supported, SL provides low latency, high reliability and high throughput for device-to-device communications. SL measurements are supported in vehicular communications (vehicle to everything, V2X). Unicast, multicast and broadcast may all support V2X SL communications. To support efficient SL communication, the SL resource allocation needs to take into account the different configuration requirements and scenarios of the SL path and Uu link path. The resource allocation includes channel state information reference signal (CHANNEL STATE information REFERENCE SIGNAL, CSI-RS) resource allocation and reporting, and a bandwidth part (BWP) configuration for SL communication. Furthermore, the slot configuration of SL has common properties with existing Uu links. The SL and Uu links share configuration information to improve system efficiency. But SL may be configured with different parameter sets (numerology) and slot configuration requires additional steps.
Therefore, SL slot configuration and side link resource allocation need to be improved and enhanced.
Disclosure of Invention
An embodiment of the present invention provides a side link time slot configuration method, including: acquiring, by a user equipment in a wireless network, a side link (pre) configuration for side link operation by a side link, wherein the user equipment is configured with a Uu link connected with a base station in the wireless network; receiving a time division duplex uplink/downlink configuration; determining a side link time slot configuration of the side link based on the side link (pre) configuration, time division duplex uplink/downlink configuration and a reference parameter set; and performing side link transceiving through the side link based on the determined side link slot configuration.
Another embodiment of the present invention provides a user equipment, including: a transceiver for transmitting and receiving radio frequency signals in a wireless network; a side link configuration module for obtaining a side link (pre) configuration for side link operation through a side link in a wireless network, wherein the user equipment is configured with Uu links connected with base stations in the wireless network; a synchronization module for receiving a time division duplex uplink/downlink configuration; a side link time slot module for determining a side link time slot configuration of the side link based on the side link (pre) configuration, a time division duplex uplink/downlink configuration and a reference parameter set; and a side link control module for performing side link transceiving through the side link based on the determined side link slot configuration.
Another embodiment of the present invention provides a storage medium storing a program that, when executed, causes a user equipment to perform the slot configuration method set forth in the present invention.
By using the present invention, the side link transceiving can be performed better.
Drawings
The drawings illustrate embodiments of the invention, wherein like numerals indicate like components.
Fig. 1 is a system diagram of an exemplary wireless network (system) for side link slot configuration and resource allocation in accordance with an embodiment of the present invention.
Fig. 2 is a schematic diagram of an exemplary NR wireless system with a centralized upper layer of NR radio interface stacks according to an embodiment of the present invention.
Fig. 3 is an exemplary top-level functional diagram for side link slot configuration and resource allocation in accordance with an embodiment of the present invention.
Fig. 4 is an exemplary schematic diagram of a side link slot configuration including an NR frame and slot structure in accordance with an embodiment of the present invention.
Fig. 5 is an exemplary diagram of a side link slot configuration based on a reference parameter set in accordance with an embodiment of the present invention.
Fig. 6 is an exemplary diagram for side-link CSI-RS resource allocation according to an embodiment of the present invention.
Fig. 7 is an exemplary schematic diagram of side link BWP configuration and allocation according to an embodiment of the present invention.
Fig. 8 is an exemplary flow chart of a side link slot configuration process based on a reference parameter set in accordance with an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to some embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
In NR wireless networks, SL is enabled. NR V2X supports transmission of CSI-RS. CSI-RS is transmitted in a physical side link shared channel (PHYSICAL SIDELINK SHARED CHANNEL, PSSCH) and may only be transmitted when higher layer (HIGHER LAYER) signaling enables SL CQI/RI reporting. SL CQI/RI reporting from the RX UE is enabled at the physical layer by side link control information (sidelink control information, SCI) to assist the TX UE in link adaptation (link adaption). The conventional CSI reporting on Uu is performed at the physical layer. The parameter set of the frame structure defines the frame/slot structure, such as the subcarrier spacing (subcarrier spacing, SCS) and symbol length. Unlike LTE networks, parameter sets in NR networks support SCS of different types. The slot configuration for SL communication needs to take into account the parameter set differences between the SL and Uu links.
Fig. 1 is a system diagram of an exemplary wireless network (system) for side link slot configuration and resource allocation in accordance with an embodiment of the present invention. The wireless system 100 includes one or more fixed infrastructure elements forming a network distributed over a geographic area. The infrastructure element may also be referred to as an access point, an access terminal, a base station, a node B, an evolved node B (eNode-B), a next generation node B (gNB), or other terminology used in the art. The network may be a homogeneous network or a heterogeneous network, and may be deployed using the same or different frequencies. gNB101 is an exemplary base station in an NR network.
The wireless network 100 also includes a plurality of communication devices or mobile stations, such as User Equipment (UE) 111, 112, 113, 114, 115, 116, and 117. An exemplary mobile device in wireless network 100 has SL capability. The mobile device may establish one or more connections with one or more base stations (e.g., gNB 101). The UE 111 has an access link with the gNB 101, including Uplink (UL) and Downlink (DL). UEs 112 also served by the gNB 101 may also establish UL and DL with the gNB 101. UE 111 establishes SL with UE 112. UE 111 and UE 112 are both in-coverage devices. Mobile devices on the vehicle (e.g., mobile devices 113, 114, and 115) also have SL capability. Mobile devices 113 and 114 are covered by the gNB 101. In-coverage device 113 establishes SL with in-coverage device 114. The mobile device 115 on the vehicle is an out-of-coverage device. An in-coverage mobile device 114 establishes SL with an out-of-coverage device 115. In other embodiments, mobile devices such as UEs 116 and 117 may both be out of coverage, but may transmit and receive packet data with another mobile device or devices over a side link.
Fig. 1 further shows a simplified block schematic diagram of a base station and mobile device/UE for side link slot configuration and resource allocation. The gNB 101 has an antenna 156 that transmits and receives radio signals. RF transceiver circuitry 153 coupled to the antenna receives RF signals from antenna 156, converts the RF signals to baseband signals, and sends the baseband signals to processor 152. The RF transceiver 153 also converts baseband signals received from the processor 152 into RF signals and sends to the antenna 156. The processor 152 processes the received baseband signal and invokes different functional modules to perform the functional features in the gNB 101. Memory 151 stores program instructions and data 154 to control the operation of gNB 101. The gNB 101 also includes a set of control modules 155 for performing functional tasks to communicate with the mobile station.
UE 111 has an antenna 165 for transmitting and receiving radio signals. An RF transceiver circuit 163 coupled to the antenna receives RF signals from the antenna 165, converts the RF signals to baseband signals, and sends the baseband signals to the processor 162. In one embodiment, the RF transceiver may include two RF modules (not shown). The first RF module is used for High Frequency (HF) transmission and reception; another RF module is different from the HF transceiver for transmission and reception of different frequency bands. The RF transceiver 163 also converts the baseband signal received from the processor 162 into an RF signal and transmits to the antenna 165. The processor 162 processes the received baseband signal and invokes different functional modules to perform functional features in the UE 111. Memory 161 stores program instructions and data 164 to control the operation of UE 111. Antenna 165 sends uplink transmissions to antenna 156 of gNB 101 and receives downlink transmissions from antenna 156 of gNB 101.
UE 111 also includes a set of control modules for performing functional tasks. These functional modules may be implemented in circuitry, software, firmware, or a combination of the above. The SL configuration module 191 uses the SL in the wireless network to obtain a SL (pre) configuration for SL operation, wherein the UE is configured with Uu links connecting with base stations in the wireless network. The synchronization module 192 receives a time division duplex (time division duplex, TDD) UL/DL configuration. The SL slot module 193 determines the SL slot configuration for SL based on the SL (pre) configuration, the TDD UL/DL configuration, and the reference parameter set. The SL control module 194 performs SL transceiving through the SL based on the determined SL slot configuration.
Fig. 2 is a schematic diagram of an exemplary NR wireless system with a centralized upper layer of NR radio interface stacks according to an embodiment of the present invention. Different protocol split options are possible between the upper layer (upper layer) of the Central Unit (CU)/gNB node and the lower layer (lower layer) of the Distributed Unit (DU)/gNB node. The functional division between the central unit and the gNB lower layers may depend on the transport layer. The low performance transmission between the central unit and the gNB lower layers may enable the higher protocol layers of the NR radio stack to be supported in the central unit, since the higher protocol layers have lower performance requirements on the transmission layers in terms of bandwidth, delay, synchronization and jitter. In one embodiment, the service data adaptation protocol (SERVICE DATA adaptation protocol, SDAP) and packet data convergence protocol (PACKET DATA convergence protocol, PDCP) layers are located at the central unit, while the radio link control (radio link control, RLC), medium Access Control (MAC) and Physical (PHY) layers are located at the distributed unit. The core unit (core unit) 201 is connected to a central unit 211 with a gNB upper layer 252. In an embodiment, the gNB upper layer 252 includes a PDCP layer and an optional SDAP layer. The central unit 211 is connected to distributed units 221, 222, and 223, wherein the distributed units 221, 222, and 223 correspond to cells 231, 232, and 233, respectively. Distributed units 221, 222, and 223 include a gNB underlayer 251. In an embodiment, the gNB lower layer 251 includes PHY, MAC, and RLC layers. In another embodiment 260, each gNB has a protocol stack 261 including SDAP, PDCP, RLC, MAC and a PHY layer.
Fig. 3 is an exemplary top-level functional diagram for side link slot configuration and resource allocation in accordance with an embodiment of the present invention. UE 301 and UE 302 are connected to gNB 303 in the NR network via Uu links 311 and 312, respectively. In an embodiment, side links 313 are configured for UE 301 and UE 302.
In an embodiment 321, the SL slot configuration is based on a reference parameter set. The UE obtains a side link configuration and a TDD downlink/uplink configuration. The SL slot configuration is derived based on Uu link parameter sets and side link parameter sets. The UE obtains a reference pattern (pattern) for slot configuration and obtains a SL slot pattern or a UL slot pattern by considering different granularity (granularity).
In another embodiment 322, CSI-RS resource allocation is performed for side link communications. For CSI-RS transmissions for CSI measurement, rate matching may be performed based on the presence of the SCI field (e.g., second stage SCI) for the CSI request and the configuration of CSI-RS resources. Specifically, the presence or absence of the CSI request field may determine whether to perform rate matching, and the configuration of CSI-RS resources may be used to determine how to perform rate matching. In addition, CSI-RS resources may be mapped onto physical side chain shared channel (PHYSICAL SIDELINK SHARED CHANNEL, PSSCH) resources of Transport Blocks (TBs). In other words, it cannot be mapped onto the PSSCH which sent the second stage SCI and/or the PSSCH which carried the first stage SCI. In other embodiments, it may be broken down (punctured) to reduce complexity. The assumed CSI table should be indicated in SCI (e.g., second stage SCI) and/or higher layer signaling to enable the UE to derive the appropriate CSI index based on CSI measurements.
In yet another embodiment 323, resource pool configuration and allocation may be performed for SL communications. For resource pool allocation, special subchannels may be introduced to accommodate resources (or Resource Blocks (RBs)) that are not multiples of or smaller than the subchannel size. For such special sub-channels, they may be limited to PSSCH transmission or to transmission of PSSCH and physical side link control channel (PSCCH) multiplexed by FDM. In an embodiment, if a PSCCH is available, the PSCCH may span all symbols in the SL slot except for the GP symbol and the physical side link feedback channel (PSFCH) symbol. Multiple resource pools may be configured with different subchannel sizes, and the UE may select a resource pool randomly or based on rules (e.g., priority of the resource pool).
In an embodiment, the SL slot configuration may be derived based on the UL slot configuration and the reference parameter set.
Fig. 4 is an exemplary schematic diagram of a side link slot configuration including an NR frame and slot structure in accordance with an embodiment of the present invention. An exemplary NR frame structure 410 shows frame 411, subframe 412, and slot 413. The 10ms frame 411 includes 10 subframes each having 1ms. Subframe 412 includes one or more slots depending on the subcarrier spacing in the parameter set. Each slot contains a plurality of symbols. Diagram 420 shows exemplary parameters in the NR parameter set. The parameter set is defined by SCS and Cyclic Prefix (CP) overhead. The NR network supports multiple SCSs. Scaling the base SCS by an integer may result in a plurality of SCSs. The SCS parameters for parameter set configuration are shown in figure 420. The NR network supports multiple SCSs including 15kHz, 30kHz, 60kHz, 120kHz, etc. The parameter set parameter μ is an integer {0, 1, 2, 3, … }, each integer corresponding to one SCS. Each NR subframe has a length of 1ms, and the number of slots per subframe is equal to 2 μ based on SCS. The slot duration is 1/2 μ ms. In other embodiments, the NR network supports more SCSs, such as 240kHz. Diagram 420 illustrates exemplary parameters.
In an NR network, multiple SCSs are supported for slot configuration. In the current system, time slots may be classified into downlink, uplink, hybrid UL and DL transmissions. In TDD, a slot may be configured for mixed use of UL and DL. NR TDD uses a flexible slot configuration. The slot format configuration in NR can be static, semi-static and dynamic. Static and semi-static slot configuration may be supported by signaling messages, such as radio resource control (radio resource control, RRC) messages. Dynamic configuration for slot configuration uses physical downlink control channel (physical downlink control channel, PDCCH) downlink control information (downlink control information, DCI). The slot configuration may be implemented by an RRC message (e.g., tdd-UL-DL-ConfigurationCommon). The slot configuration may be configured with only one pattern, or may be configured with two patterns. Fig. 430 shows an exemplary slot configured with only pattern 1 and parameter set parameter mu ref. The single UL/DL pattern is periodically transmitted in DL-UL-TransmissionPeriodicity. The total number of slots in period 431 is determined based on the period and the configured SCS. The number of DL slots 432 and the number of UL slots 433 are configured within period 431. The number of DL symbols in DL/flexible (D/F) slots 434 and the number of UL symbols in flexible/UL (F/D) slots 435 may also be configured.
With configuration parameters, UL slots associated with the configured pattern may be derived from the TDD UL/DL configuration. In an embodiment, the TDD UL/DL configuration is carried by a system information block (system information block, SIB). When the parameter sets of Uu link and side link are different, the number of side link slots is also based on the parameter set difference between SL and Uu link. The number of UL slots is also based on the parameter set differences. Diagram 440 shows an exemplary scenario for deriving a side link slot configuration based on parameter set differences between Uu links/interfaces and side links. Referring to the example of diagram 430, the side link slot configuration uses TDD UL/DL configuration information to derive the number of side link slots. In an embodiment, the Uu interface μ ref =2 is assumed. The sidelink configuration 442 has the same number of sidelink timeslots as uplink timeslots. When μ=1, the side link configuration 443 is configured such that the number of side link slots is half that of the uplink slots. Similarly, when μ=3, the side link configuration 441 is configured such that the number of side link slots is twice the number of uplink slots. Further, as shown at 444, when the side link and Uu link have different parameter sets, the parameter set difference may result in additional side link slots being generated based on the number of uplink symbols and the reference parameter set. The number of side link slots in the side link slot configuration is based on the reference parameter set.
Fig. 5 is an exemplary diagram of a side link slot configuration based on a reference parameter set in accordance with an embodiment of the present invention. The UE 501 and the UE 502 are connected to the gNB 503 in the NR network via Uu links 511 and 512, respectively. The UE 501 and the UE 502 are configured with a side link configuration for the side link 513. The UE determines a side link slot configuration 520 based on the reference pattern and the reference parameter set for the slot configuration. SL slot configuration 520 configures the number and/or location of SL slots that include only SL symbols. SL slot configuration 520 includes SL period configuration 521 and configuration 522 for the number of SL slots. The UE carries/indicates the configurations 521 and 522 in a side chain synchronization signal block (sidelink synchronization signal block, S-SSB) 550. For TDD UL/DL information carried in the S-SSB to determine available SL slots, a single and double periodic pattern associated with UL slots per period is indicated in the S-SSB that may be acquired from the Uu interface (e.g., SIB message). The SL periodic configuration 521, including the periodic configuration and the pattern indication, may be obtained via a TDD UL/DL configuration 552. In an embodiment, the TDD UL/DL configuration 552 is carried by SIB messages.
The bits in the S-SSB are limited and therefore cannot carry all combinations. To save bits, the same indication can be used with different granularity for different values of n for the same pattern for each of the double periods, i.e., { p1=n, p2=n }. For example, for the dual cycle mode { P1, P2} = {5,5}, consecutive SL or UL slots of the pattern {5,5} are indicated by some bits. For other patterns with the same period, P1 and P2, i.e., {2,2}, {2.5,2.5}, and {10, 10}, the corresponding differences in information and parameter sets can be derived with reference to the SL or UL slot indication for pattern {5,5 }. As shown in fig. 430 and 440, when a reference pattern as in fig. 430 is configured, the UE may derive a SL or UL slot configuration based on the reference pattern configuration in fig. 430. The configuration in diagram 440 is applicable to both side link and uplink slot configurations, with a different set of parameters than the reference set of parameters mu ref.
The number 522 of SL slots can be obtained by Uu link slot configuration 532 and side link parameter set 531. Uu link slot configuration 532 includes a Uu link parameter set or reference parameter set 535 and a UL slot number or reference slot number 536. The UL slots include only UL symbols. Uu link slot configuration 532 may be obtained from TDD UL/DL configuration 552. The SL parameter set 531 may be (pre) configured for the side link operation. In an embodiment, the SL parameter set 531 may be obtained from a SL signaling message 553 (e.g., an RRC message). In yet another embodiment, for inter-carrier indication of the eNB/gNB to change from one frequency to another frequency for TDD UL/DL configuration for SL operation, the parameter set related to TDD UL/DL configuration for SL frequency may be indicated by base station signaling for SL operation, such as dedicated RRC or SIB messages for SL operation. In an embodiment, the reference parameter set is a Uu link parameter set. According to different embodiments, the reference parameter set and the side link parameter set are (pre) configured with the same or different parameter sets.
Fig. 6 is an exemplary diagram for side-link CSI-RS resource allocation according to an embodiment of the present invention. In an embodiment, CSI-RS 610 for SL CSI measurement is configured. In an embodiment 611, the configuration 610 maps the resources onto the symbols of the PSSCH used for the TB transmission. In another embodiment 612, punctured resources are used. For CSI-RS transmissions for CSI measurement, rate matching may be performed based on the presence of the SCI field (e.g., second stage SCI) for the CSI request and the configuration of CSI-RS resources. In addition, in an embodiment, the CSI-RS resources are mapped on PSSCH resources of the transmitting TB. The CSI-RS resources cannot be mapped to the PSSCH that sends the second stage SCI and/or the PSSCH that carries the first stage SCI because the UE needs rate-reduction matching to decode the first stage SCI and the second stage SCI that carry the CSI request field. Since the resource size of the second stage SCI may vary, the exact CSI-RS resource location may also vary, thereby avoiding collision between the second stage SCI and the first stage SCI resources. The CSI-RS resources can only be mapped onto the symbols of the PSSCH for TB transmission (i.e. without any first stage SCI and second stage SCI transmissions). In an embodiment, the exact CSI-RS resource locations may be implicitly derived from the time/frequency resources of the first stage SCI and/or the second stage SCI, or may be derived from the configuration. In another embodiment, the SL CSI-RS resources may be punctured. These will be transparent to the UE receiver, with little or negligible degradation.
In another embodiment, a SL CSI table 620 for CSI reporting is configured. In an embodiment 621, SL CSI reporting resources are configured per resource pool/BWP. In another embodiment 622, the SL CSI report resources are indicated in the SCI field. For SL CSI reporting, a hypothetical SL CSI table (e.g., 64QAM, 256QAM, or ultra-reliable low-delay communication (ultra reliable low latency communication, URLLC) table) may be configured for each resource pool/BWP and/or exchanged between UEs through PC 5-RRC. In other embodiments, the hypothetical SL CSI table may be indicated from a set of (pre) configuration CSI tables in the SCI field (e.g., second stage SCI). As such, dynamic switching between SL MCS tables may be performed based on SL CSI reports derived from different hypothetical SL CSI tables corresponding to different SL MCS tables. In an embodiment, SCI and/or higher layer signaling indicates only one hypothetical CSI table with which the reported CSI is implicitly associated. In another embodiment, multiple hypothetical CSI tables are indicated. The UE may report CSI associated with the hypothesized CSI table index, i.e., different CSI reports associated with different CSI tables. In case that a plurality of CSI resources are configured, the UE may report CSI results associated with the corresponding CSI-RS resource index.
Fig. 7 is an exemplary schematic diagram of side link BWP configuration and allocation according to an embodiment of the present invention. In an NR network, a subchannel is configured with N RBs. SL BWP configuration 710 configures the SL BWP by the number of RBs instead of a multiple of the subchannel size.
In an embodiment 711, one or more resource pools may be configured to utilize minimized segmented resources (minimized fragmented resources) (i.e., non-sub-channel sizes or less than sub-channel sizes) to fully utilize all resources. For example, multiple resource pools may be configured with different subchannel sizes so that the fractional resources are very limited. The UE may select the resource pool randomly or based on a rule, such as a priority of the resource pool.
In another embodiment 712, segmented resources may be configured as PSSCH and/or PSCCH and/or PSFCH transmissions employing separate resource pools. Any number of PRBs may be configured for a resource pool.
In yet another embodiment 713, a maximum (or at least) one resource pool in the SL BWP may be configured with RBs that are not multiples of the subchannel size. For example, multiple resource pools may be configured for SL BWP, where RBs configured for at most (or at least) one resource pool are not multiples of the subchannel size. The transmission/reception of the PSSCH will be limited to those resources that are multiples of the sub-channel size. The minimum RB index among the minimum subchannel indexes of the resource pool is the minimum RB index of the resource pool. The remaining RBs in the resource pool (i.e., RBs smaller than the subchannel size) may be designated as a special subchannel that may be used for PSSCH transmission but not for PSCCH transmission, i.e., may be considered as a supplemental subchannel for PSSCH transmission. Such special sub-channels may carry PSCCH and PSSCH by FDM multiplexing. In this case, the PSCCH may be transmitted (if available) on all but GP and PSFCH symbols in the SL slot.
Fig. 8 is an exemplary flow chart of a side link slot configuration process based on a reference parameter set in accordance with an embodiment of the present invention. In step 801, the UE acquires SL (pre-) configuration in the wireless network for SL operation by means of SL, wherein the UE is configured with Uu links connected with base stations in the wireless network. In step 802, the ue receives a TDD UL/DL configuration. In step 803, the ue determines the SL slot configuration for SL based on the SL configuration, the TDD UL/DL configuration, and the reference parameter set. In step 804, the ue transmits/receives SL through SL based on the determined SL slot configuration.
In one embodiment, a storage medium (e.g., a computer-readable storage medium) stores a program that, when executed, causes a UE to perform an embodiment of the present invention.
Although the invention has been described in connection with specific embodiments for purposes of illustration, the invention is not limited thereto. Accordingly, various modifications, adaptations, and combinations of the various features of the described embodiments can be practiced without departing from the scope of the invention as set forth in the claims.
Claims (21)
1. A side link time slot configuration method comprises the following steps:
Acquiring a side link configuration or pre-configuration for side link operation in a wireless network through a side link by a user equipment, wherein the user equipment is configured with a Uu link connected with a base station in the wireless network;
Receiving a time division duplex uplink/downlink configuration;
Determining a side link slot configuration of the side link based on the side link configuration or pre-configuration, a time division duplex uplink/downlink configuration and a reference parameter set; and
And carrying out side link transceiving through the side link based on the determined side link time slot configuration.
2. The side link slot configuration method according to claim 1, wherein the side link slot configuration is used for configuring the number and/or the position of side link slots including only side link symbols.
3. The side link slot configuration method according to claim 2, wherein the number of side link slots including only the side link symbol is obtained by including only the number of slots of the uplink symbol, the reference parameter set, and the side link parameter set.
4. A side link time slot configuration method according to claim 3, characterized in that the reference parameter set is a Uu link parameter set, the Uu link parameter set and the side link parameter set being configured or preconfigured with the same or different parameter sets.
5. A side link time slot configuration method according to claim 3, characterized in that the reference parameter set relates to the time division duplex uplink/downlink configuration.
6. A side link time slot configuration method according to claim 3, characterized in that the side link parameter set is configured or preconfigured for the side link operation.
7. The side link time slot configuration method according to claim 6, wherein the side link parameter set is configured or preconfigured by receiving a signaling message, wherein the signaling message is a dedicated radio resource control message or a system information block message.
8. A side link time slot configuration method according to claim 3, characterized in that the number of time slots comprising only uplink symbols is obtained by the time division duplex uplink/downlink configuration.
9. The method of side link slot configuration according to claim 2, wherein the number of side link slots including only side link symbols is carried in a side link synchronization signal block.
10. The side link time slot configuration method of claim 1, wherein the time division duplex uplink/downlink configuration is carried by a system information block.
11. A user equipment, comprising:
a transceiver for transmitting and receiving radio frequency signals in a wireless network;
A side link configuration module, configured to obtain a side link configuration or pre-configuration for a side link operation through a side link in a wireless network, wherein the user equipment is configured with a Uu link connected with a base station in the wireless network;
a synchronization module for receiving a time division duplex uplink/downlink configuration;
A side link time slot module for determining a side link time slot configuration of the side link based on the side link configuration or pre-configuration, a time division duplex uplink/downlink configuration and a reference parameter set; and
And the side link control module is used for carrying out side link transceiving through the side link based on the determined side link time slot configuration.
12. The user equipment according to claim 11, wherein the side link slot configuration is used to configure the number and/or location of side link slots comprising only side link symbols.
13. The user equipment of claim 12, wherein the number of side link slots comprising only side link symbols is obtained by the number of slots comprising only uplink symbols, a reference parameter set, and a side link parameter set.
14. The user equipment according to claim 13, wherein the reference parameter set is a Uu link parameter set, and wherein the Uu link parameter set and the side link parameter set are configured or preconfigured with the same or different parameter sets.
15. The user equipment of claim 13, wherein the reference parameter set relates to the time division duplex uplink/downlink configuration.
16. The user equipment according to claim 13, wherein the side link parameter set is configured or preconfigured for the side link operation.
17. The user equipment according to claim 16, characterized in that the side chain parameter set is configured or preconfigured by receiving a signaling message, wherein the signaling message is a dedicated radio resource control message or a system information block message.
18. The user equipment of claim 13, wherein the number of time slots comprising only uplink symbols is obtained by the time division duplex uplink/downlink configuration.
19. The user equipment of claim 12, wherein the number of sidelink slots that include only sidelink symbols is carried in a sidelink synchronization signal block.
20. The user equipment of claim 11, wherein the time division duplex uplink/downlink configuration is carried by a system information block.
21. A storage medium storing a program which, when executed, causes a user equipment to perform the steps of the side link slot configuration method of any one of claims 1 to 10.
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| TW110112931A TWI809372B (en) | 2020-04-10 | 2021-04-09 | Methods and apparatus for slot configuration for sidelink communication |
| US17/226,831 US20210321369A1 (en) | 2020-04-10 | 2021-04-09 | Slot Configuration and Resource Allocation for Sidelink Communication |
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| CNPCT/CN2020/084193 | 2020-04-10 | ||
| PCT/CN2020/084193 WO2021203411A1 (en) | 2020-04-10 | 2020-04-10 | Enhancement for sl communication |
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