CN111130729A - Method performed by user equipment and user equipment - Google Patents
Method performed by user equipment and user equipment Download PDFInfo
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- CN111130729A CN111130729A CN201811294793.7A CN201811294793A CN111130729A CN 111130729 A CN111130729 A CN 111130729A CN 201811294793 A CN201811294793 A CN 201811294793A CN 111130729 A CN111130729 A CN 111130729A
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/0008—Wavelet-division
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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
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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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
Abstract
The invention provides a method executed by user equipment, which comprises the following steps: acquiring configuration information of a time slot format from another device different from the user equipment; and determining a time slot format corresponding to the subcarrier interval configured by the base station or preconfigured in the user equipment according to the acquired configuration information of the time slot format.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method performed by a user equipment and a corresponding user equipment.
Background
In a conventional cellular network, all communications must pass through the base station. In contrast, D2D communication (Device-to-Device communication) refers to a communication method in which two user equipments directly communicate with each other without forwarding through a base station or a core network. The research topic on the realization of the near D2D communication service with LTE devices was approved at RAN #63 of 3rd Generation partnership project (3 GPP) in 2014 (see non-patent document 1). Functions introduced by LTE Release 12D 2D include:
1) discovery function (Discovery) between adjacent devices in an LTE network coverage scenario;
2) a direct Broadcast communication (Broadcast) function between neighboring devices;
3) the higher layer supports Unicast (Unicast) and multicast (Groupcast) communication functions.
On the 3GPP RAN #66 congress of 12 months in 2014, the research project of enhanced LTE eD2D (enhanced D2D) was approved (see non-patent document 2). The main functions introduced by LTE Release 13 eD2D include:
1) D2D discovery of no-network coverage scenarios and partial-network coverage scenarios;
2) priority handling mechanism for D2D communications.
Based on the design of the D2D communication mechanism, the V2X feasibility study topic based on D2D communication was approved at the RAN #68 time congress of 3GPP at 6 months 2015. V2X shows that Vehicle to evolution is expected to realize the interaction between Vehicle and all entity information that may affect the Vehicle, in order to reduce accident, slow down traffic jam, reduce environmental pollution and provide other information services. V2X mainly contains 4 aspects:
1) V2V, Vehicle to Vehicle, i.e. Vehicle-to-Vehicle communication;
2) V2P, Vehicle to peer, i.e. the Vehicle sends a warning to pedestrians or non-motor vehicles;
3) V2N, Vehicle to Network, i.e. Vehicle connected mobile Network;
4) V2I, Vehicle to Infrastructure, i.e. the Vehicle communicates with road Infrastructure etc.
The 3GPP has divided the research and standardization work of V2X into 3 stages. The first phase was completed in 2016 and 9 months, focusing mainly on V2V, and was formulated based on LTE Release 12 and Release 13D 2D (also called sidelink edge connection), i.e., proximity communication technology (see non-patent document 3). V2X stage 1 introduced a new D2D communication interface, called PC5 interface. The PC5 interface is mainly used to solve cellular internet of vehicles communication problems in high speed (up to 250 km/h) and high node density environments. The vehicles can interact with information such as position, speed and direction through the PC5 interface, i.e., the vehicles can communicate directly with each other through the PC5 interface. Compared with D2D near communication, the functions introduced by LTE Release 14V 2X mainly include:
1) higher density DMRS to support high speed scenarios;
2) introducing a sub-channel (sub-channel) to enhance a resource allocation mode;
3) a user equipment aware (sensing) mechanism with semi-persistent scheduling (semi-persistent) is introduced.
The second stage of the V2X research topic belongs to the LTE Release 15 research category (see non-patent document 4), and the introduced main characteristics include high-order 64QAM modulation, V2X carrier aggregation, short TTI, and feasibility research of transmit diversity.
At the 3GPP RAN #80 congress of 6 months in 2018, the corresponding third stage was approved based on the V2X feasibility study topic of 5G NR network technology (see non-patent document 5). The research project of this subject includes design of a synchronization mechanism of edge join (sidelink). The scheme of the invention mainly aims at a design mode that a physical synchronization channel carries SFI (slot format indication) indication in edge connection (sidelink) communication based on an NR (network) technology and a method for determining the SFI by user equipment.
The research project for NR-based V2X feasibility research project also includes design goals to support physical layer unicast, multicast, and broadcast. Unicast refers to communication between one transmitting User Equipment (UE) and a single receiving user equipment. Multicast means that a group of UEs is assigned the same ID by a higher layer and the UEs communicate within the group. The broadcast is widely applied to scenes that a base station sends system messages to UE in a cell in cellular communication and the like. In LTE and NR communications, the base station and UE level communications take the form of unicast. For downlink data communication as an example, the data channel PDSCH is scrambled by using a C-RNTI specific to the UE to realize unicast communication of a physical layer. It is worth noting that in order to improve the reliability and spectral efficiency of the transmission, HARQ retransmission mechanisms are typically included in unicast communication. Release 14/15 currently supports only broadcast communication between UEs in the LTE V2X project, i.e., control information and data transmitted by one UE can be received and correctly decoded by one or more other UEs. For NR V2X, to enable unicast communication at the physical layer, as described above, the HARQ retransmission mechanism needs to be specifically designed.
Documents of the prior art
Non-patent document
Non-patent document 1: RP-140518, Work item deployment on LTE Device to Device deployment Services
Non-patent document 2: RP-142311, Work Item Proposal for Enhanced LTE Device to Device Proximity Services
Non-patent document 3: RP-152293, New WI propofol: support for V2V services basedon LTE sidelink
Non-patent document 4: RP-170798, New WID on 3GPP V2X Phase 2
Non-patent document 5: RP-181480, New SID Proposal: study on NR V2X
Disclosure of Invention
In order to solve at least part of the above problems, the present invention proposes a method performed by a user equipment and a user equipment capable of determining configuration information of an appropriate slot format or transmitting edge connection system information having an appropriate reference subcarrier spacing at one user equipment performing direct communication of the UE with the UE.
According to the invention, there is provided a method performed by a user equipment, comprising: acquiring configuration information of a time slot format from another device different from the user equipment; and determining a time slot format corresponding to the subcarrier interval configured by the base station or preconfigured in the user equipment according to the acquired configuration information of the time slot format.
Preferably, the another device is a synchronization reference user equipment of the user equipment or a base station communicating with the user equipment.
Preferably, the configuration information of the time slot format includes: the method comprises the steps of reference subcarrier spacing, and/or configuration period, and/or the number of downlink time slots, and/or the number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols, and/or the number of uplink time slots, and/or the number of uplink OFDM symbols.
Preferably, the step of determining a slot format corresponding to a subcarrier spacing configured by a base station or preconfigured in the user equipment comprises: and converting the number of downlink time slots and/or the number of downlink OFDM symbols and/or the number of uplink time slots and/or the number of uplink OFDM symbols included in the configuration information of the time slot format into the time slot format based on a numerical relationship between the reference subcarrier spacing included in the configuration information of the time slot format and a subcarrier spacing configured by a base station or preconfigured in the user equipment, wherein the time slot format includes a second number of downlink time slots and/or a second number of downlink OFDM symbols and/or a second number of uplink time slots and/or a second number of uplink OFDM symbols.
Further, according to the present invention, there is provided a method performed by a user equipment, comprising: acquiring configuration information of a slot format including a reference subcarrier spacing from another device different from the user equipment; and transmitting edge connection system information, the edge connection system information including an indication of a subcarrier spacing.
Preferably, the another device is a synchronization reference user equipment of the user equipment or a base station communicating with the user equipment.
Preferably, the indication of the subcarrier spacing is a minimum subcarrier spacing or 0 preconfigured in the user equipment, or the reference subcarrier spacing.
Further, according to the present invention, there is provided a method performed by a user equipment, comprising: acquiring first configuration information and/or second configuration information of a time slot format from another device different from the user equipment; and determining the number of available uplink time slots in the period of the periodic service according to the acquired first configuration information and/or second configuration information of the time slot format.
Preferably, the another device is a synchronization reference user equipment of the user equipment or a base station communicating with the user equipment.
Furthermore, according to the present invention, there is also provided a user equipment, including: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, perform the method described above.
According to the present invention, it is possible to determine configuration information of an appropriate slot format or transmit edge connection system information having an appropriate reference subcarrier spacing at one user equipment performing direct communication of a UE with the UE.
Drawings
The above and other features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
fig. 1 is a diagram illustrating an example of configuration information of a time slot format of TDD uplink and downlink broadcasted by an NR base station in the related art.
Fig. 2 is a schematic timing diagram illustrating a direct communication procedure of a UE with the UE.
Fig. 3 is a diagram for explaining two resource allocation schemes in the direct communication between the UE and the UE.
Fig. 4 is a flowchart illustrating a method performed by a user equipment according to a first embodiment of the present invention.
Fig. 5 is a diagram illustrating an example of slot formats before and after conversion in the first embodiment of the present invention.
Fig. 6 is a flow chart illustrating a method performed by a user equipment according to a second embodiment of the present invention.
Fig. 7 is a flowchart illustrating a method performed by a user equipment according to a third embodiment of the present invention.
Fig. 8 is a flowchart illustrating a method performed by a user equipment according to a fourth embodiment of the present invention.
Fig. 9 is a block diagram illustrating a user equipment UE to which the present invention relates.
Detailed Description
The invention is described in detail below with reference to the figures and the detailed description. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known technologies not directly related to the present invention are omitted to prevent confusion of understanding of the present invention.
Embodiments according to the present invention are described in detail below with a 5G mobile communication system and its subsequent evolution as an example application environment. However, it is to be noted that the present invention is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as a communication system after 5G and a 4G mobile communication system before 5G, and the like.
Some terms to which the present invention relates will be described below, and the terms to which the present invention relates are defined herein, unless otherwise specified. The terms given in the invention may adopt different naming manners in LTE, LTE-Advanced Pro, NR and the following communication systems, but the unified terms adopted in the invention can be replaced by the terms adopted in the corresponding systems when being applied to the specific systems.
3 GPP: 3rd Generation partnershift Project, third Generation Partnership Project
LTE: long Term Evolution, Long Term Evolution technology
NR: new Radio, New Wireless, New air interface
PDCCH: physical Downlink Control Channel, Physical Downlink Control Channel
DCI: downlink Control Information, Downlink Control Information
PDSCH: physical Downlink Shared Channel (pdcch)
UE: user Equipment, User Equipment
eNB: evolved NodeB, evolved node B
And g NB: NR base station
TTI: transmission Time Interval, Transmission Time Interval
OFDM: orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing
C-RNTI: cell Radio Network Temporary Identifier
CSI: channel State Indicator, Channel State Indicator
HARQ: hybrid Automatic Repeat Request (HARQ)
CSI-RS: CSI-Reference Signal, channel State measurement Reference Signal
CRS: cell Reference Signal, Cell level Reference Signal
PUCCH: physical Uplink Control Channel, Physical Uplink Control Channel
PUSCH: physical Uplink Shared Channel, Physical Uplink Shared Channel
UL-SCH: uplink Shared Channel, Uplink Shared Channel
Sidelink: edge connection
SCI: edge Control Information, edge connection Control Information
PSCCH: physical Sidelink Control Channel, Physical edge connection Control Channel
MCS: modulation and Coding Scheme, Modulation and Coding Scheme
PRB: physical Resource Block, Physical Resource Block
PSSCH: physical Sidelink Shared Channel, Physical edge connected Shared Channel
FDM: frequency Division Multiplexing, Frequency Division Multiplexing
RRC: radio Resource Control, Radio Resource Control
RSRP: reference Signal Receiving Power, Reference Signal Receiving Power
SRS: sounding Reference Signal
DMRS: demodulation Reference Signal
CRC: cyclic Redundancy Check (crc)
PSDCH: physical Sidelink Discovery Channel
PSBCH: physical Sidelink Broadcast Channel, Physical edge connected Broadcast Channel
SFI: slot Format Indication
TDD: time Division Duplexing
FDD: frequency Division Duplexing
And (3) SIBl: system Information Block Type 1, System Information Block Type 1
SLSS: edge join synchronization Signal
PSSS: primary Sidelink Synchronization Signal, edge-connected Primary Synchronization Signal
SSSS: secondary Sidelink Synchronization Signal, edge-connected Secondary Synchronization Signal
PCI: physical Cell ID, Physical Cell identity
BWP: bandwidth Part, BandWidth fragment/portion
The following is a description of the technology associated with the inventive arrangements. Unless otherwise specified, the same terms in the specific examples have the same meanings as in the art.
Scenarios for edge connection (Sidelink) communications
1) Out-of-Coverage (Out-of-Coverage): neither UE communicating on the edge connection has network coverage (e.g., the UE does not detect any cells satisfying the "cell selection criteria" on the frequency on which the edge connection communication is desired).
2) Network Coverage (In-Coverage): both UEs communicating on the edge connection have network coverage (e.g., the UE detects at least one cell that satisfies the "cell selection criteria" on the frequency on which the edge connection communication is desired).
3) Partial-network overlay (Partial-Coverage): one of the UEs performing edge-connected communication has no network coverage, and the other UE has network coverage.
From the UE side, the UE has only two scenarios, namely, network coverage and non-network coverage. Partial network coverage is described from edge-connected communication of connections of UEs on both sides.
LTE TDD uplink and downlink configuration information
The LTE supports 7 TDD uplink and downlink configuration information in total, and the serial numbers are TDD UL/DL configurations 0-6, as shown in the following table 4.2-2. Where "D" denotes a downlink subframe (subframe), "U" denotes an uplink subframe, and "S" denotes a special subframe (special subframe). The special subframe consists of a downlink symbol (DwPTS), a guard interval (Gap), and an uplink symbol (UpPTS), and the present invention is not related to the specific configuration of the special subframe, and is not described herein again. The LTE base station configures TDD uplink and downlink configuration information of a cell in an SIB 1.
TABLE 4.2-2
LTE V2X SLSS/PSBCH and MIB
The LTE edge connection uses LTE uplink resources, and the design of the physical layer channel structure is also similar to LTE uplink.
The LTE edge connection defines an edge connection synchronization signal (SLSS) for frequency and time synchronization between two UEs performing edge connection communication, and particularly, when at least one of the UEs has no network coverage, one UE acquires the SLSS synchronization signal transmitted by the other UE. The SLSS includes primary synchronization signal PSSS and secondary synchronization signal SSSS, which may carry SLSS ID, the same principle as PCI is carried by primary and secondary synchronization signals in LTE and NR cellular communications.
The LTE edge connection also defines a PSBCH for broadcasting system information (system information) related to the edge connection, wherein,
1) the time-frequency resources used by the PSBCH occupy 72 subcarriers in the center of the edge-connected carrier in the frequency domain and one subframe for the PSBCH in the time domain, but exclude the REs used for the DMRS reference signal and the SLSS synchronization signal described above.
2) The system information related to the edge connection transmitted on PSBCH may be MIB-SL-V2X (masterinformation block-SL-V2X for the master information block of V2X), which includes:
■, the configuration of the transmission Bandwidth, using the parameter sl-Bandwidth.
■ TDD configuration, using 8 cases in total for the parameter TDD-ConfigSL. none indicates FDD for the edge connected carrier sending the MIB, 0 indicates TDD UL/DL configuration information 0, 1 indicates TDD UL/DL configuration information 1, and so on.
■ DFN (direct frame number) for transmitting SLSS and PSBCH, using parameter direct FrameNumber.
■ the DSFN (direct subframe number) used for transmitting SLSS and PSBCH uses the parameter direct subframe number.
■ has a network coverage flag indicating whether the UE transmitting the MIB-SL-V2X has LTE network coverage, and uses a parameter coverage.
Method for determining TDD configuration information of LTE V2X UE
The LTE base station indicates V2X edge connection communication related resource configuration information through SIB 21. In addition, the UE may pre-configure (pre-configure) a set of V2X edge connection parameters using the parameter SL-V2X-reconfiguration via higher layer protocols. The UE with network coverage can obtain the configuration information related to V2X edge-connected communication through SIB21, and the UE without network coverage can obtain the configuration information related to V2X edge-connected communication through preconfigured V2X edge-connected parameters and MIB-SL-V2X sent by other UEs.
The UE with network coverage acquires the TDD uplink and downlink configuration information of the cell through the SIB1 sent by the base station. In LTE V2X, a UE without network coverage (denoted as UE1) may select SLSS/PSBCH transmitted by another UE (with or without network coverage, denoted as UE2) as a synchronization reference for edge connection transmission, and may consider UE2 as a "synchronization reference UE" (synchronization reference UE, or simply SyncRef UE) of UE 1. The UE2 carries TDD-ConfigSL in the transmitted PSBCH, and the UE1 obtains TDD uplink and downlink configuration information by receiving the edge connection system information.
LTE V2X UE sends SLSS/PSBCH
When a V2X UE has data to transmit, the UE needs to send an SLSS/PSBCH. At this time, the UE needs to determine the value of tdd-ConfigSL in PSBCH.
1) UE with network coverage: the value of TDD-ConfigSL is the same as the value of TDD-Config configuration information in the LTE base station SIB1, that is, if the SIB1 is configured with TDD UL/DL configuration information 2, the UE sets the value of TDD-ConfigSL as TDD uplink and downlink configuration information 2, and so on;
2) UE without network coverage: if the UE selects the 'synchronous reference UE (SyncRef UE)', the value of the tdd-ConfigSL is the same as the value of the tdd-ConfigSL in the MasterInformationBlock-SL-V2X sent by the 'synchronous reference UE'.
NR parameter set (numerology)
NR supports 5 subcarrier spacings of 15k, 30k, 60k, 120k, 240kHz (corresponding to 0, 1, 2, 3, 4), respectively, and table 4.2-1 shows the set of supported transmission parameters, as shown below.
TABLE 4.2-1
| μ | Δf＝2μ·15[kHz] | CP (Cyclic prefix) |
| 0 | 15 | Is normal |
| 1 | 30 | Is normal |
| 2 | 60 | Normal, extended |
| 3 | 120 | Is normal |
| 4 | 240 | Is normal |
Extended (Extended) CP is supported only when μ ═ 2, i.e., in the case of 60kHz subcarrier spacing, and only normal CP is supported in the case of other subcarrier spacing. For Normal (Normal) CP, each slot (slot) contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols. For a sub-carrier spacing of 15kHz, 0, 1 slot 1 ms; mu is 1, namely 30kHz subcarrier interval, and 1 time slot is 0.5 ms; mu is 2, i.e. 60kHz subcarrier spacing, 1 slot is 0.25ms, and so on.
Indication and determination method of NR SFI
The gNB configures a cell-level slot format (slotted format) through TDD-UL-DL-configuration common in SIB1, which includes:
● reference subcarrier spacing muref；
● high-level parameters pattern1, which include the following high-level parameters:
■ configuration period P (ms);
■ number of downstream time slots dslotsThe downlink slot only contains downlink OFDM symbols (which may be called DL-only slots);
■ number of downlink OFDM symbols dsym；
■ number u of upstream time slotsslotsThe uplink slot only contains uplink OFDM symbols (which may be referred to as UL-only slots);
■ number u of uplink OFDM symbolssym。
The period of the configuration information is P ms, corresponding to continuous
And a time slot. Fig. 1 shows the detailed meaning of the various high-level parameters contained in pattern 1. In S time slots, d is firstslotsA downlink time slot uslotsThe uplink slots are located at the end of the S slots. dsymAfter a downlink OFDM symbol is located in a downlink time slot, usymOne uplink OFDM symbol is located before the uplink time slot, and the rest
Each OFDM symbol is an X symbol (X denotes a flexible symbol). The X symbol may be a downlink symbol, an uplink symbol, or a guard interval symbol between downlink and uplink in different application scenarios. Wherein, for normal CP (normal CP),
for extended cp (extended cp),
the TDD-UL-DL-configuration common in SIB1 may contain higher layer parameters pattern 2. The configuration information of the Pattern2 and the Pattern1 are the same (the parameters of the Pattern2 include dslots，2，uslots，2，dsym，2，usym，2) Reference subcarrier spacing murefAs with pattern 1.
In NR, gNB configures at most 4 downlink BWPs and 4 uplink BWPs for each UE. Wherein the configuration information of each BWP includes an indication μ of the subcarrier spacing in the BWP. gNB ensures μrefμ ≦ (subcarrier spacing for any downlink or uplink BWP for the UE).
stepDetermination of LTE V2X P
LTE V2X includes periodic traffic generated with a period of approximately Pserv＝100ms。PstepIs shown at PservThe number of available uplink subframes. The following table 14.1.1-1 shows P in LTE V2XstepAnd taking values when different TDD uplinks and downlinks are configured with information. For example, for TDD UL/DL configuration information 2, each system frame contains 2 uplink subframes. At PservThe service period of 100ms includes 20 uplink subframes. Table 14.1.1-1 shows P for edge connection transmission modes 3 and 4stepThe details of the determination of (2) are shown in the following table.
TABLE 14.1.1-1
| Pstep | |
| UL/DL configuration information 0 for TDD | 60 |
| TDDUL/DL configuration information 1 | 40 |
| UL/ |
20 |
| UL/DL configuration information 3 for TDD | 30 |
| UL/DL configuration information 4 for TDD | 20 |
| UL/DL configuration information 5 for TDD | 10 |
| UL/DL configuration information 6 for TDD | 50 |
| Others | 100 |
Basic procedure for LTE V2X direct communication
Fig. 2 is a diagram illustrating the basic procedure for LTE V2X UE direct communication. The UE1 sends edge connection control information (SCI format 1), carried by the physical layer channel PSCCH, to the UE 2. SCI format 1 contains scheduling information of the psch, such as time and frequency domain resources, MCS, etc. The PSSCH carries data (sidelink data: edge connection data) transmitted by the UE1 to the UE2 in FIG. 1.
1) The PSCCH occupies one subframe in the time domain and two consecutive PRBs in the frequency domain. A predefined value 510 is used in the initialization of the scrambling sequence. The PSCCH may carry SCI format 1, and includes time-frequency domain resource information of at least the PSCCH, such as a frequency domain resource indication field, which indicates a starting sub-channel number and a number of consecutive sub-channels of the PSCCH corresponding to the PSCCH.
2) PSSCH is identical in time domainThe samples occupy one subframe and the corresponding PSCCH frequency reuse (FDM) is on the same subframe. The PSSCH is in the form of a sub-channel in the frequency domain, the sub-channel being n in the frequency domainsubCHsizeA plurality of consecutive PRBs, nsubCHsizeThe number of sub-channels is indicated by the frequency domain resource indication field of SCI format 1, configured by RRC parameters.
LTE V2X resource allocation Mode Transmission 3/4
Fig. 3 shows two resource allocation manners of LTE V2X, which are respectively referred to as resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (sensing) (Transmission Mode 4). In LTEV2X, when eNB network coverage exists, the base station may configure the resource allocation mode of the UE, or the transmission mode of the UE, through the UE-level RRC signaling SL-V2X-ConfigDedicated.
1) Resource allocation mode based on base station scheduling: when configured as scheduled-r14 in the RRC signaling SL-V2X-ConfigDedicated, it indicates that the UE is configured as a transmission mode based on base station scheduling. The base station configures SL-V-RNTI through RRC, and sends an uplink scheduling permission UL permission to the UE through PDCCH (DCI format 5A). The uplink scheduling grant includes at least information such as a frequency domain resource indicator of the psch. And after the UE successfully monitors the PDCCH scrambled by the SL-V-RNTI, the PSSCH frequency domain resource indication domain in the uplink scheduling permission is used as the frequency domain resource scheduling information of the PSSCH in SCI format 1.
2) Resource allocation based on UE sensing (sending): the configuration of the RRC signaling SL-V2X-ConfigDedicated as UE-Selected-r14 indicates that the UE is configured to be based on the UE-aware transmission mode. In the above transmission mode, the base station configures an available transmission resource pool, and the UE determines transmission resources of the PSCCH and the PSCCH in the transmission resource pool (resource pool) according to a certain criterion (such as RSRP), and transmits the PSCCH and the PSCCH according to the flow in fig. 2. The method for determining the resource pool and the criterion for determining the available resources by the UE are not described in detail in the present invention.
LTE edge connection Discovery (Discovery) mode
The LTE edge connection defines two Discovery modes (Discovery modes).
1) Mode A: a discovery mode referred to as "I am here". Two types of UEs are included in mode a.
■ notification type UE (announcing UE) which notifies discovery message that neighboring UEs can receive and use the discovery message for edge connection discovery;
■ listening type UE (monitoring UE) which monitors the adjacent UE of the discovery message sent by the informing type UE.
2) And (3) mode B: is called "who is there? (Who is there)? (Are you Are. Mode B includes two types of UEs.
■ discovery type UE (discovery UE) sends discovery message containing request information.
■ discoveree UE receives the request message and replies with information related to the request message.
In all the examples and embodiments of the present invention, d is not specifically describedslots，uslots，dsym，usymAll can be formed byslots，2，uslots，2，dsym，2，usym，2And equivalents are in turn used, and the invention is not limited in this regard.
[ example one ]
Fig. 4 is a flowchart illustrating a method performed by a user equipment according to a first embodiment of the present invention.
The method performed by the ue according to the first embodiment of the present invention is described in detail with reference to fig. 4.
As shown in fig. 4, in a first embodiment of the present invention, the steps performed by the user equipment include:
in step S401, the user equipment receives system information transmitted by the synchronization reference user equipment. The system information may include configuration information for the slot format. Optionally, the configuration information may include a reference subcarrier spacing (in μ)refRepresentation), and/or the period P of the configuration information, and/or the number of downlink time slots (in d)slotsExpressed), and/or the number of downlink OFDM symbols (in d)symRepresentation), and/or the number of uplink slotsMu (with u)slotsExpressed in u) and/or the number of uplink OFDM symbols (in u)symRepresentation).
In step S403, the ue determines a slot format (slot format) corresponding to the subcarrier spacing μ configured by the base station or preconfigured by the ue according to the obtained configuration information of the slot format. As an example, one implementation of the determination method is as follows:
●P′＝P
●
●
●
●
wherein floor represents the lower integer function. For the subcarrier spacing μ, the slot format period determined by the ue is P ' ms, corresponding to consecutive S ' ═ P ' × 2μAnd a time slot. In S' time slots, d is firstslots' one downlink time slot, uslotsThe 'uplink slots are located at the end of the S' slots. dsym' several downlink OFDM symbols are located at dslotsAfter' one downlink time slot, usym' several uplink OFDM symbols are located at uslots' one upstream time slot before, the rest
The OFDM symbols are X symbols.
As shown above, in step S403, the reference inter-sub-carrier in the configuration information of the acquired slot format is utilizedEvery murefD in the configuration information of the obtained time slot format is the numerical relation between the obtained time slot format and the subcarrier spacing mu configured by the base station or pre-configured in the user equipmentslots、dsym、uslots、usymConversion to d'slots、d′sym、u′slots、usym', as the slot format corresponding to the subcarrier spacing μ.
The upper part of fig. 5 schematically shows an example of configuration information of a slot format before conversion acquired from the synchronous reference user equipment, and the lower part of fig. 5 shows an example of a slot format after conversion at step S403.
Optionally, in step S401 in the first embodiment of the present invention, another possible implementation manner is that the ue receives the system information sent from the gNB. The system information may include configuration information for the slot format. Optionally, the configuration information may include a reference subcarrier spacing (in μ)refExpressed), configuration period P, number of downlink slots (in d)slotsExpressed), number of downlink OFDM symbols (in d)symExpressed), number of uplink slots (in u)slotsExpressed), number of uplink OFDM symbols (in u)symRepresentation).
Optionally, in step S403 of the first embodiment,
alternatively, the first and second electrodes may be,
where ceil represents the ceiling function.
■ for the case of normal CP, if u'sym14, the user equipment may determine u'symFurther changed to 0, u'slotsChanged to u'slots+1。
■ for the case of extended CP, if u'sym12, the user equipment may determine u'symFurther changed to 0, u'slotsChanged to u'slots+1。
That is, when the converted number of uplink OFDM symbols is equal to the number of symbols included in each slot, the converted number of uplink OFDM symbols is set to zero as a newly determined number of uplink OFDM symbols, and the converted number of uplink slots is increased by one as a newly determined number of uplink slots.
[ example two ]
Fig. 6 is a flow chart illustrating a method performed by a user equipment according to a second embodiment of the present invention.
In a second embodiment of the present invention, the user equipment performs the steps including:
in step S601, the ue acquires system information including timeslot format configuration information sent by the base station. The system information includes a reference subcarrier spacing (in μ)refRepresentation).
In step S603, the user equipment transmits edge connection system information. The system information includes an indication of a subcarrier spacing.
Optionally, in step S601 in the second embodiment of the present invention, another implementation is to acquire, by the ue, edge connection system information containing timeslot format configuration information, where the edge connection system information is sent by a synchronization reference ue. The system information includes a reference subcarrier spacing (in μ)refRepresentation).
Optionally, in step S601 in the second embodiment of the present invention, the configuration information sent by the base station or the synchronization reference ue may also include a period P of the configuration information and/or a number d of downlink timeslots on the premise that the configuration information includes a reference subcarrier intervalslotsAnd/or the number of downlink OFDM symbols dsymAnd/or the number u of uplink slotsslotsAnd/or the number u of uplink OFDM symbolssym(the above configuration information may be collectively referred to as first configuration information).
Optionally, in step S603 of the second embodiment of the present invention, the edge connection system information includes an indication of a subcarrier spacing. The indication may be a minimum subcarrier spacing mu in a pre-configured parameter for the user equipmentminOr the indication may be 0 (corresponding to a 15kHz subcarrier)Wave interval) or reference subcarrier interval in the first configuration information.
Optionally, in step S603 of the second embodiment of the present invention, the edge connection system information may also include a downlink timeslot number d 'on the premise of including the reference subcarrier spacing'slotsAnd/or the number of downlink symbols d'symAnd/or the number of uplink slots u'slotsAnd/or the number of uplink symbols u'sym(which may be collectively referred to as second configuration information). The conversion relationship between the second configuration information and the first configuration information is calculated according to the calculation method disclosed in step S403 of the first embodiment of the present invention. In the calculation manner of step S403 in the first embodiment, the value of the subcarrier spacing μ is a reference subcarrier spacing included in the first configuration information, or a minimum subcarrier spacing μ in the ue preconfigured parametersminOr, alternatively, 0.
[ third example ]
Fig. 7 is a flowchart illustrating a method performed by a user equipment according to a third embodiment of the present invention.
In a third embodiment of the present invention, the user equipment performs steps including:
in step S701, the user equipment receives system information transmitted by the synchronization reference user equipment. The system information may include first configuration information and/or second configuration information of a slot format. Optionally, the configuration information may include the first configuration period P and/or the second configuration period P2The first number of uplink slots (in u)slotsExpressed in u) and/or the second number of uplink slots (expressed in u)slots，2Representation).
In step S703, the ue determines the number P of available uplink timeslots in the service periodstep. One embodiment of the determination method is as follows:
Pstep＝(uslots+uslots，2)·Pserv/(P+P2)
wherein, PservRepresenting the data period of V2X periodic traffic.
Optionally, in step S701 of the third embodiment of the present invention, another method may be usedA possible implementation is that the user equipment receives system information sent from the gNB. The system information may include configuration information for the slot format. Optionally, the configuration information may include the first configuration period P and/or the second configuration period P2The first number of uplink slots (in u)slotsExpressed in u) and/or the second number of uplink slots (expressed in u)slots，2Representation).
Optionally, in step S703 of the third embodiment of the present invention, another possible determining method is as follows:
Pstep＝uslots·Pserv/P
wherein, PservRepresenting the data period of V2X periodic traffic.
[ example four ]
Fig. 8 is a flowchart illustrating a method performed by a user equipment according to a fourth embodiment of the present invention.
In a fourth embodiment of the present invention, the user equipment performs steps including:
in step S801, the user equipment indicates whether the HARQ function is enabled. Alternatively, the user equipment may be indicated in SCI (or PSCCH), or the user equipment may be indicated in a system message (or PSBCH) of the edge connection.
In step S803, the user equipment indicates a resource allocation manner. Alternatively, the user equipment may be indicated in SCI (or PSCCH), or the user equipment may be indicated in a system message for edge connection (PSBCH).
Optionally, in step S801 of the fourth embodiment of the present invention, one implementable manner of the indication in the SCI or the system message is a 1-bit indication field. Wherein 0 indicates enabling the HARQ function and 1 indicates disabling the HARQ function, or vice versa. Another possible implementation of the SCI or indication in the system message is a bitmap indication. Wherein each bit of the bitmap corresponds to one receiving UE. The bit "0" indicates that the HARQ function of the receiving UE is enabled, and the bit "1" indicates that the HARQ function of the receiving UE is disabled, or vice versa.
Optionally, in step S803 in the fourth embodiment of the present invention, one implementable manner indicated in the SCI or the system message is a 1-bit indication field. Wherein 0 represents a resource allocation manner based on base station scheduling, and 1 represents a resource allocation manner based on user equipment perception, or vice versa.
Optionally, in step S801 and step S803 of the fourth embodiment of the present invention, another implementation is that the ue indicates whether the HARQ function and/or the resource allocation manner of the ue are enabled in a Discovery Message (Discovery Message). The discovery message may be carried in PSDCH, or PSCCH, or pscsch, or PSBCH. Optionally, another embodiment is that the user equipment indicates or coordinates (coordination or coordination) whether the HARQ function is enabled and/or a resource allocation manner of the user equipment through higher layer signaling (RRC signaling, or NAS signaling, or AS signaling) in a connection setup (or establishment) process. The above optional embodiments also include a specific implementation manner of the 1-bit indication field or the bitmap indication, which is not limited in the present invention.
Fig. 9 is a block diagram showing a user equipment UE according to the present invention. As shown in fig. 9, the user equipment UE80 includes a processor 901 and a memory 902. The processor 901 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like. The memory 902 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 902 has stored thereon program instructions. Which when executed by the processor 901 may perform the above-described methods performed by the user equipment as detailed in the present invention.
The method of the invention and the apparatus involved have been described above in connection with preferred embodiments. It will be appreciated by those skilled in the art that the above illustrated approaches are exemplary only, and that the various embodiments described above can be combined with each other without conflict. The method of the present invention is not limited to the steps or sequence shown above. The network nodes and user equipment shown above may comprise further modules, e.g. modules that may be developed or developed in the future, which may be available to a base station, MME, or UE, etc. The various identifiers shown above are exemplary only and not limiting, and the invention is not limited to the specific information elements that are examples of these identifiers. Many variations and modifications may occur to those skilled in the art in light of the teachings of the illustrated embodiments.
It should be understood that the above-described embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware. For example, various components within the base station and the user equipment in the above embodiments may be implemented by various means, including but not limited to: analog circuit devices, Digital Signal Processing (DSP) circuits, programmable processors, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), programmable logic devices (CPLDs), and the like.
In this application, a "base station" may refer to a mobile communication data and control switching center with a large transmission power and a wide coverage area, and includes functions of resource allocation scheduling, data receiving and transmitting, and the like. "user equipment" may refer to a user mobile terminal, including, for example, a mobile phone, a notebook, etc., which may wirelessly communicate with a base station or a micro base station.
Furthermore, embodiments of the invention disclosed herein may be implemented on a computer program product. More specifically, the computer program product is one of the following: there is a computer readable medium having computer program logic encoded thereon that, when executed on a computing device, provides related operations for implementing the above-described aspects of the present invention. When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in embodiments of the present invention. Such arrangements of the invention are typically provided as downloadable software images, shared databases, etc. arranged or encoded in software, code and/or other data structures on a computer readable medium such as an optical medium (e.g., CD-ROM), floppy or hard disk or other medium such as firmware or microcode on one or more ROM or RAM or PROM chips or in one or more modules. The software or firmware or such configurations may be installed on a computing device to cause one or more processors in the computing device to perform the techniques described in embodiments of the present invention.
Further, each functional block or respective feature of the base station device and the terminal device used in each of the above embodiments may be implemented or executed by a circuit, which is typically one or more integrated circuits. Circuitry designed to perform the various functions described in this specification may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC) or a general purpose integrated circuit, a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The general-purpose processor or each circuit described above may be configured by a digital circuit, or may be configured by a logic circuit. Further, when advanced technology capable of replacing the current integrated circuit is developed due to the advancement of semiconductor technology, the present invention can also use the integrated circuit obtained by the advanced technology.
Although the present invention has been described in conjunction with the preferred embodiments thereof, it will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention. Accordingly, the present invention should not be limited by the above-described embodiments, but should be defined by the appended claims and their equivalents.
Claims (10)
1. A method performed by a user equipment, comprising:
acquiring configuration information of a time slot format from another device different from the user equipment; and
and determining a time slot format corresponding to the subcarrier interval configured by the base station or preconfigured in the user equipment according to the acquired configuration information of the time slot format.
2. The method of claim 1,
the another device is a synchronization reference user equipment of the user equipment or a base station communicating with the user equipment.
3. The method of claim 1,
the configuration information of the time slot format comprises: the method comprises the steps of reference subcarrier spacing, and/or configuration period, and/or the number of downlink time slots, and/or the number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols, and/or the number of uplink time slots, and/or the number of uplink OFDM symbols.
4. The method of claim 3, wherein the step of determining the slot format corresponding to the subcarrier spacing configured by the base station or preconfigured in the user equipment comprises:
and converting the number of downlink time slots and/or the number of downlink OFDM symbols and/or the number of uplink time slots and/or the number of uplink OFDM symbols included in the configuration information of the time slot format into the time slot format based on a numerical relationship between the reference subcarrier spacing included in the configuration information of the time slot format and a subcarrier spacing configured by a base station or preconfigured in the user equipment, wherein the time slot format includes a second number of downlink time slots and/or a second number of downlink OFDM symbols and/or a second number of uplink time slots and/or a second number of uplink OFDM symbols.
5. A method performed by a user equipment, comprising:
acquiring configuration information of a slot format including a reference subcarrier spacing from another device different from the user equipment; and
transmitting edge connection system information, the edge connection system information including an indication of a subcarrier spacing.
6. The method of claim 5,
the another device is a synchronization reference user equipment of the user equipment or a base station communicating with the user equipment.
7. The method of claim 5,
the indication of the subcarrier spacing is a minimum subcarrier spacing or 0 preconfigured in the user equipment, or the reference subcarrier spacing.
8. A method performed by a user equipment, comprising:
acquiring first configuration information and/or second configuration information of a time slot format from another device different from the user equipment; and
and determining the number of available uplink time slots in the period of the periodic service according to the acquired first configuration information and/or second configuration information of the time slot format.
9. The method of claim 8,
the another device is a synchronization reference user equipment of the user equipment or a base station communicating with the user equipment.
10. A user equipment, comprising:
a processor; and
a memory having stored therein instructions that, when executed,
wherein the instructions, when executed by the processor, perform the method of any of claims 1-9.
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| CN201811294793.7A CN111130729A (en) | 2018-11-01 | 2018-11-01 | Method performed by user equipment and user equipment |
| PCT/CN2019/114318 WO2020088513A1 (en) | 2018-11-01 | 2019-10-30 | Method executed by user equipment, and user equipment |
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| WO2021228136A1 (en) * | 2020-05-14 | 2021-11-18 | 夏普株式会社 | Method executed by user equipment, and user equipment |
| WO2021228138A1 (en) * | 2020-05-14 | 2021-11-18 | 夏普株式会社 | Method executed by user equipment and user equipment |
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| WO2022016517A1 (en) * | 2020-07-24 | 2022-01-27 | Apple Inc. | User equipment operating as relay via a sidelink connection |
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| CN105451211B (en) * | 2014-09-25 | 2019-12-27 | 中兴通讯股份有限公司 | Method and apparatus for device-to-device communication |
| CN107005829B (en) * | 2014-11-19 | 2020-10-13 | 瑞典爱立信有限公司 | D2D finding |
| CN106793092B (en) * | 2015-11-19 | 2022-07-26 | 中兴通讯股份有限公司 | Method and device for acquiring control channel resources |
| CN110072217B (en) * | 2016-03-24 | 2021-10-29 | 上海朗帛通信技术有限公司 | Method and apparatus for narrowband communication of cellular network |
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| WO2021228136A1 (en) * | 2020-05-14 | 2021-11-18 | 夏普株式会社 | Method executed by user equipment, and user equipment |
| WO2021228138A1 (en) * | 2020-05-14 | 2021-11-18 | 夏普株式会社 | Method executed by user equipment and user equipment |
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