WO2025129673A1 - 一种信道接入方法、装置、终端、芯片和存储介质 - Google Patents
一种信道接入方法、装置、终端、芯片和存储介质 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
Definitions
- the embodiments of the present application relate to the field of communication technology, and specifically to a channel access method, device, terminal, chip and storage medium.
- a user equipment When a user equipment (UE) sends S-SSB on multiple channels, it can use Type A or Type B multi-channel access to access the multiple channels.
- the UE needs to independently perform Type 1 channel access on the multiple channels. If the access is successful on any one or more of the channels, the UE can send S-SSB on the one or more channels.
- the UE In the Type B multi-channel access process, the UE can randomly select one channel from the multiple channels for Type 1 channel access and perform Type 2 channel access on the other channels. If Type 1 channel access is successful, the UE can send S-SSB on each channel where the channel access is successful; if Type 1 channel access fails, the multiple channels are considered unavailable.
- COT Channel Occupancy Time
- the above-mentioned multi-channel access methods of type A or type B cannot effectively prevent COT resources from being preempted by users of different systems.
- the UE adopts the multi-channel access method of type A the UE needs to perform type 1 channel access on the channel included in the COT.
- the probability of COT being preempted by users of different systems is high; for another example, when the UE adopts the multi-channel access method of type B, if the UE performs type 1 channel access on one of the channels included in the COT, since the channel listening time during type 1 channel access is long, and whether other channels can be used to send S-SSB depends on the channel access result of the channel, it also leads to a high probability that COT is preempted by users of different systems.
- Embodiments of the present application provide a channel access method, device, terminal, chip, and storage medium.
- an embodiment of the present application provides a channel access method, which is applied to a first terminal, and the method includes: performing type 2 channel access on at least one first channel in a group of channels, and performing type 2 channel access on at least one first channel.
- the channel access result obtained is used to determine whether at least one first channel can be used to send a side link synchronization signal block S-SSB in a first time slot; wherein the group of channels is a channel planned to send S-SSB in the first time slot, and at least one first channel and the first time slot are included in the channel occupancy time COT.
- an embodiment of the present application provides a channel access device, comprising: a processing unit, configured to perform type 2 channel access on at least one first channel in a group of channels, and a channel access result obtained by performing type 2 channel access on at least one first channel is used to determine whether at least one first channel can be used to send a side link synchronization signal block S-SSB in a first time slot; wherein the group of channels is a channel planned to send S-SSB in the first time slot, and at least one first channel and the first time slot are included in the channel occupancy time COT.
- an embodiment of the present application provides a terminal, including a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above-mentioned channel access method.
- an embodiment of the present application provides a chip for implementing the above-mentioned channel access method.
- the chip includes: a processor for calling and running a computer program from a memory so that a device equipped with the chip executes the above-mentioned channel access method.
- an embodiment of the present application provides a computer-readable storage medium for storing a computer program, which enables a computer to execute the above-mentioned channel access method.
- an embodiment of the present application provides a computer program product, including computer program instructions, which enable a computer to execute the above-mentioned channel access method.
- an embodiment of the present application provides a computer program which, when executed on a computer, enables the computer to execute the above-mentioned channel access method.
- the first terminal can perform type 2 channel access on at least one first channel in a group of channels, and obtain The channel access result can be used to determine whether the at least one first channel can be used to send S-SSB in the first time slot, wherein the group of channels is a channel planned to be used to send S-SSB in the first time slot, and the at least one first channel and the first time slot are included in the COT.
- the channel listening duration in the type 2 channel access process is short, performing type 2 channel access on at least one first channel included in the COT, and determining whether the at least one first channel can be used for sending S-SSB based on the result of the channel access, is conducive to improving the probability that the first terminal successfully accesses the at least one first channel and sends S-SSB on the at least one first channel, thereby facilitating the maintenance of occupation of COT resources to avoid loss of COT resources (such as avoiding COT resources being preempted by users of different systems).
- FIG1 is a schematic diagram of sideline communication within network coverage provided by an embodiment of the present application.
- FIG2 is a schematic diagram of sideline communication with partial network coverage provided by an embodiment of the present application.
- FIG3 is a schematic diagram of side communication outside network coverage provided by an embodiment of the present application.
- FIG4 is a schematic diagram of side communication with a central control node provided in an embodiment of the present application.
- FIG5 is a schematic diagram of a unicast transmission method provided in an embodiment of the present application.
- FIG6 is a schematic diagram of a multicast transmission method provided in an embodiment of the present application.
- FIG7 is a schematic diagram of a broadcast transmission method provided in an embodiment of the present application.
- FIG8 is a schematic diagram of a time slot structure in NR-V2X provided in an embodiment of the present application.
- FIG. 9 is a schematic diagram showing changes in the OFDM symbols available in a time slot of a PSSCH in different transmissions provided by an embodiment of the present application.
- FIG10 is a schematic diagram of a mapping method of a second-order SCI provided in an embodiment of the present application.
- FIG11 is a schematic diagram of the time-frequency domain position of the PSCCH DMRS provided in an embodiment of the present application.
- FIG12 is a schematic diagram of the time domain position of 4 DMRS symbols when the PSSCH has 13 symbols provided in an embodiment of the present application;
- FIG13 is a schematic diagram of a single-symbol DMRS frequency domain type 1 provided in an embodiment of the present application.
- FIG14 is a schematic diagram of the time-frequency position of the SL CSI-RS provided in an embodiment of the present application.
- FIG15 is a schematic diagram of an example of channel occupancy time and channel occupancy provided in an embodiment of the present application.
- FIG16 is a schematic diagram of S-SSB time-frequency domain mapping provided in an embodiment of the present application.
- FIG17 is a schematic diagram of channel access using a TypeA multi-channel access method provided in an embodiment of the present application.
- FIG18 is a schematic diagram of channel access using a Type B multi-channel access method provided in an embodiment of the present application.
- FIG19 is a schematic diagram of a flow chart of a channel access method provided in an embodiment of the present application.
- FIG20 is a schematic diagram of an implementation scheme of a channel access method provided in an embodiment of the present application.
- FIG21 is a second schematic diagram of an implementation scheme of the channel access method provided in an embodiment of the present application.
- FIG22 is a third schematic diagram of an implementation scheme of the channel access method provided in an embodiment of the present application.
- FIG23 is a schematic diagram of the structure of a channel access device provided in an embodiment of the present application.
- FIG24 is a schematic structural diagram of a communication device provided in an embodiment of the present application.
- FIG. 25 is a schematic structural diagram of a chip according to an embodiment of the present application.
- side communication according to the network coverage of the communicating terminals, it can be divided into side communication within the network coverage, side communication with partial network coverage, side communication outside the network coverage, and side communication with a central control node, as shown in Figures 1, 2, 3 and 4 respectively.
- some terminals performing sidelink communication are located within the coverage of the base station. These terminals can receive the configuration signaling of the base station and perform sidelink communication according to the configuration of the base station. However, terminals outside the network coverage cannot receive the configuration signaling of the base station. In this case, the terminals outside the network coverage will determine the sidelink configuration according to the pre-configuration information and the information carried in the sidelink broadcast channel (Physical Sidelink Broadcast Channel, PSBCH) sent by the terminals within the network coverage, so as to perform sidelink communication.
- PSBCH Physical Sidelink Broadcast Channel
- all terminals performing sideline communications are located outside network coverage, and all terminals determine sideline configurations according to pre-configuration information and perform sideline communications.
- multiple terminals constitute a communication group, and the communication group has a central control node, such as UE1 in FIG4 .
- the central control node can also be called a cluster header terminal (Cluster Header, CH).
- the central control node has at least one of the following functions, but is not limited to: responsible for establishing a communication group; joining and leaving group members; coordinating resources, allocating sideline transmission resources to other terminals, receiving sideline feedback information from other terminals; and coordinating resources with other communication groups.
- D2D Device to Device
- V2X Vehicle to Everything
- Device-to-device communication is a sidelink transmission technology based on D2D. It is different from the traditional cellular system where communication data is received or sent by base stations, so it has higher spectrum efficiency and lower transmission latency.
- the Internet of Vehicles system adopts terminal-to-terminal direct communication.
- the 3rd Generation Partnership Project (3GPP) defines two transmission modes: the first mode and the second mode.
- the transmission resources of the terminal are allocated by the base station, and the terminal sends data on the sidelink according to the resources allocated by the base station; the base station can allocate resources for single transmission to the terminal, or allocate resources for semi-static transmission to the terminal. As shown in Figure 1, the terminal is within the coverage of the network, and the network allocates transmission resources for the terminal to use for sidelink transmission.
- the second mode The terminal selects a resource in the resource pool for data transmission. As shown in Figure 3, the terminal is outside the coverage of the cell, and the terminal autonomously selects a transmission resource from the pre-configured resource pool for side transmission; or in Figure 1, the terminal autonomously selects a transmission resource from the resource pool configured by the network for side transmission.
- unicast transmission there is only one receiving terminal.
- the receiving terminal is all terminals in a communication group, or all terminals within a certain transmission distance.
- UE1, UE2, UE3 and UE4 constitute a communication group, in which UE1 sends data, and other terminal devices in the group are receiving terminals.
- the receiving terminal is any terminal around the sending terminal.
- UE1 is the sending terminal, and the other terminals around it, UE2 to UE6, are all receiving terminals.
- Figure 8 (a) is a schematic diagram of the time slot structure in which the physical sidelink feedback channel (PSFCH) is not included in the time slot;
- Figure 8 (b) is a schematic diagram of the time slot structure in which the PSFCH channel is included.
- PSFCH physical sidelink feedback channel
- the Physical Sidelink Control Channel (PSCCH) in NR-V2X starts from the second sidelink symbol of the time slot in the time domain, occupies 2 or 3 Orthogonal Frequency Division Multiplexing (OFDM) symbols, and can occupy ⁇ 10, 12 15, 20, 25 ⁇ Physical Resource Blocks (PRBs) in the frequency domain.
- OFDM Orthogonal Frequency Division Multiplexing
- PRBs Physical Resource Blocks
- PSSCH supports up to two stream transmissions, and uses a unit precoding matrix to map the data on the two layers to two antenna ports. At most, only one transport block (TB) can be sent in one PSSCH.
- transport block TB
- the modulation symbols sent by the second-order SCI on the two streams are exactly the same. This design can ensure the reception performance of the second-order SCI in highly correlated channels.
- the code rate of the second-order SCI can be adjusted dynamically within a certain range.
- the specific code rate is indicated by the first-order SCI, so the receiver does not need to perform blind detection on the second-order SCI even after the code rate changes.
- the modulation symbols of the second-order SCI are mapped from the symbol where the first PSSCH DMRS is located in the frequency domain first and then in the time domain. On the OFDM symbol where the DMRS is located, the second-order SCI is mapped to the RE not occupied by the DMRS, as shown in Figure 10.
- PSSCH follows the transport block size (TBS) determination mechanism of the physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) in the new radio (NR), that is, the TBS is determined according to the reference value of the number of REs used for PSSCH in the time slot where PSSCH is located, so that the actual code rate is as close to the target code rate as possible.
- TBS transport block size
- the purpose of using the reference value of the number of REs instead of the actual number of REs here is to ensure that the number of REs used to determine the TBS remains unchanged during the PSSCH retransmission process, so that the determined TBS size is the same.
- the reference value NRE of the number of REs occupied by PSSCH in the TBS determination process is determined according to formula (1):
- the pseudo-random sequence c(m) is given by Initialize, where l is the index of the OFDM symbol where the DMRS is located in the time slot, is the index of the time slot where the DMRS is located in the system frame, It represents the number of OFDM symbols in a time slot, N ID ⁇ 0,1,...,65535 ⁇ .
- N ID the number of OFDM symbols in a time slot
- the specific value of N ID in a resource pool is configured or pre-configured by the network.
- NR-V2X draws on the design of the NR Uu interface and uses multiple time-domain PSSCH DMRS patterns.
- the number of available DMRS patterns is related to the number of PSSCH symbols in the resource pool.
- the available DMRS patterns and the position of each DMRS symbol in the pattern are shown in Table 2.
- Figure 12 shows a schematic diagram of the time-domain position of 4 DMRS symbols when the PSSCH has 13 symbols.
- the specific time-domain DMRS pattern to be used is selected by the transmitting UE and indicated in the first-order SCI. This design allows high-speed UEs to select high-density DMRS patterns to ensure the accuracy of channel estimation, while for low-speed UEs, low-density DMRS patterns can be used to improve spectrum efficiency.
- the generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is in the initialization formula c init of the pseudo-random sequence c(m).
- NR PDSCH and PUSCH support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2, and for each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol.
- Single symbol DMRS frequency domain type 1 supports 4 DMRS ports
- single symbol DMRS frequency domain type 2 can support 6 DMRS ports
- the number of supported ports is doubled.
- PSSCH since PSSCH only needs to support two DMRS ports at most, only single symbol DMRS frequency domain type 1 is supported, as shown in Figure 13.
- CSI-RS Sidelink Channel State Information Reference Signal
- NR-V2X supports SL CSI-RS.
- SL CSI-RS will only be used when the following three conditions are met: send:
- the UE sends the corresponding PSSCH, that is, the UE cannot only send SL CSI-RS;
- the maximum number of ports supported by SL CSI-RS is 2.
- the SL CSI-RS of different ports are multiplexed by code division on two adjacent REs of the same OFDM symbol.
- the number of SL CSI-RS of each port in a PRB is 1, that is, the density is 1. Therefore, SL CSI-RS will appear in at most one OFDM symbol in a PRB, and the specific position of the OFDM symbol is determined by the transmitting terminal.
- SL CSI-RS cannot be located in the same OFDM symbol as PSCCH and the second-order SCI.
- the SL-CSI-RS cannot be sent on the same OFDM symbol as the PSSCH DMRS.
- the position of the OFDM symbol where the SL CSI-RS is located is indicated by the sl-CSI-RS-FirstSymbol parameter in PC5RRC.
- the position of the first RE occupied by SL CSI-RS in a PRB is indicated by the sl-CSI-RS-FreqAllocation parameter in PC5RRC. If SL CSI-RS is one port, this parameter is a bitmap with a length of 12, corresponding to 12 REs in one PRB. If SL CSI-RS is two ports, this parameter is a bitmap with a length of 6. In this case, SL CSI-RS occupies two REs, 2f(1) and 2f(1)+1, where f(1) represents the index of the bit with a value of 1 in the above bitmap.
- the frequency domain position of SL CSI-RS is also determined by the transmitting terminal, but the determined frequency domain position of SL CSI-RS cannot conflict with PT-RS.
- FIG14 shows a schematic diagram of the time-frequency position of a SL CSI-RS.
- the number of SL CSI-RS ports is 2
- sl-CSI-RS-FirstSymbol is 8
- the NR system introduced by the 3GPP R15 standard is a communication technology for use on existing and new licensed spectrum.
- the NR system can achieve seamless coverage, high spectrum efficiency, high peak rate and high reliability of cellular networks.
- LTE Long Term Evolution
- unlicensed spectrum or unlicensed spectrum
- the NR system can also use unlicensed spectrum as part of 5G cellular network technology to provide services to users.
- NR-U NR-unlicensed
- the NR-U system supports two networking modes: licensed spectrum assisted access and unlicensed spectrum independent access.
- the former requires the use of licensed spectrum to access the network, and the unlicensed spectrum is used as a secondary carrier; the latter can be independently networked through unlicensed spectrum, and the UE can directly access the network through the unlicensed spectrum.
- the range of unlicensed spectrum used by the NR-U system introduced in 3GPP R16 is concentrated in the 5GHz and 6GHz frequency bands, such as 5925-7125MHz in the United States, or 5925-6425MHz in Europe. In the R16 standard, band 46 (5150MHz-5925MHz) is newly defined as an unlicensed spectrum.
- Unlicensed spectrum is a spectrum that can be used for radio equipment communication, which is divided by countries and regions. This spectrum is usually considered to be a shared spectrum, that is, as long as the communication equipment meets the regulatory requirements set by the country or region on the spectrum, it can use the spectrum without applying for exclusive spectrum authorization from the exclusive spectrum management agency of the country or region. Since the use of unlicensed spectrum needs to meet the specific regulatory requirements of each country and region, such as the communication equipment using unlicensed spectrum in accordance with the principle of "Listen Before Talk (LBT)". Therefore, NR technology needs to be enhanced accordingly to adapt to the regulatory requirements of unlicensed frequency bands, while efficiently using unlicensed spectrum to provide services. In the 3GPP R16 standard, the standardization of NR-U technology in the following aspects is mainly completed: channel monitoring process; initial access process; control channel design; Hybrid Automatic Repeat reQuest (HARQ) and scheduling; scheduling-free authorized transmission, etc.
- HARQ Hybrid Automatic Repeat reQuest
- the duration that the communication device can use the channel for communication transmission cannot exceed a certain duration. This mechanism limits the maximum duration that can be used for communication after a successful LBT, so that different communication devices have the opportunity to access the shared channel, thereby allowing different communication systems to coexist in a friendly manner on the shared spectrum.
- channel monitoring is not a global regulation, it can bring interference avoidance and friendly coexistence benefits to communication transmissions between communication systems on shared spectrum. Therefore, in the design process of NR system on unlicensed spectrum, channel monitoring is a feature that communication equipment in the system must support. From the perspective of system networking, channel monitoring includes two mechanisms, one is load-based equipment (LBE) LBT, also known as dynamic channel monitoring or dynamic channel occupancy, and the other is frame-based equipment (FBE) LBT, also known as semi-static channel monitoring or semi-static channel occupancy.
- LBE load-based equipment
- FBE frame-based equipment
- Dynamic channel monitoring can also be considered as an LBT method based on LBE.
- the principle of channel monitoring is that the communication equipment performs LBT on the carrier of the unlicensed spectrum after the service arrives, and starts sending signals on the carrier after the LBT is successful.
- the LBT method of dynamic channel monitoring includes Type 1 channel access method and Type 2 channel access method.
- the Type 1 channel access method is a multi-slot channel detection with random backoff based on the adjustment of the contention window size, in which the corresponding channel access priority (Channel Access Priority Class, CAPC) p can be selected according to the priority of the service to be transmitted.
- CAPC Channel Access Priority Class
- the Type 2 channel access method is a channel access method based on a fixed-length monitoring time slot, in which the Type 2 channel access method includes Type 2A channel access, Type 2B channel access and Type 2C channel access.
- the Type 1 channel access method is mainly used for communication equipment to initiate channel occupation, and the Type 2 channel access method is mainly used for communication equipment to share channel occupation.
- One special case that needs to be explained is that when the base station initiates channel occupancy for the transmission of the Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block within the Discovery Reference Symbol (DRS) window and the DRS window does not include UE's unicast data transmission, if the length of the DRS window does not exceed 1ms and the duty cycle of the DRS window transmission does not exceed 1/20, then the base station can use Type2A channel access to initiate channel occupancy.
- SS/PBCH Synchronization Signal/Physical Broadcast Channel
- DRS Discovery Reference Symbol
- FIG15 shows an example of a channel occupancy time obtained by a communication device after successful LBT on a channel of an unlicensed spectrum and signal transmission using resources within the channel occupancy time.
- the channel access parameters corresponding to the channel access priority p on the base station side are shown in Table 3.
- m p refers to the number of backoff slots corresponding to the channel access priority p
- CWp refers to the contention window (Contention Window, CW) size corresponding to the channel access priority p
- CW min,p refers to the minimum value of CW p corresponding to the channel access priority p
- CW max,p refers to the maximum value of CW p corresponding to the channel access priority p
- T mcot,p refers to the maximum channel occupancy time length corresponding to the channel access priority p.
- the base station can use the channel to transmit the service to be transmitted.
- the maximum time length that the base station can use the channel for transmission cannot exceed T mcot,p .
- the resources in the COT can also be shared with the UE for uplink transmission.
- the channel access mode that the UE can use is Type 2A channel access, Type 2B channel access or Type 2C channel access, among which Type 2A channel access, Type 2B channel access and Type 2C channel access are all channel access modes based on fixed-length monitoring time slots.
- Type2A channel access
- Type2B channel access
- the UE's channel detection method is 16 ⁇ s single-slot channel detection. Specifically, under Type2B channel access, the UE can perform 16 ⁇ s channel monitoring before the start of transmission, and transmit after the channel monitoring is successful. Among them, the gap between the start position of the transmission and the end position of the previous transmission is 16 ⁇ s.
- Type2C channel access
- the UE transmits without performing channel detection after the gap ends. Specifically, under Type 2C channel access, the UE can directly transmit, wherein the gap between the start position of the transmission and the end position of the previous transmission is less than or equal to 16 ⁇ s. The length of the transmission does not exceed 584 ⁇ s.
- Channel access parameter indication (including cyclic prefix extension (CPE))
- the base station can explicitly indicate channel access parameters such as CPE length, channel access mode or channel access priority to the UE by means of joint coding.
- channel access parameters such as CPE length, channel access mode or channel access priority to the UE by means of joint coding.
- the following introduces the characteristics of the indication mode of channel access parameters introduced in different DCI formats.
- the set of joint indications of channel access mode and CPE length preset in the standard is shown in Table 4.
- the fallback uplink authorization includes 2-bit LBT indication information, and the 2-bit LBT indication information is used to indicate the jointly coded channel access mode and CPE length from the set shown in Table 4.
- the channel access mode and CPE length are used for PUSCH transmission. If the channel access mode is Type 1 channel access, the UE selects the channel access priority CAPC according to the service priority.
- the set of channel access mode and CPE length joint indications preset in the standard is shown in Table 4.
- the fallback downlink grant includes 2-bit LBT indication information, which is used to indicate the jointly coded channel access mode and CPE length from the set shown in Table 4.
- the channel access mode and CPE length are used for PUCCH transmission, where the PUCCH can carry the positive acknowledgement (ACK) or negative acknowledgement (Negative ACK) corresponding to the PDSCH. If the channel access mode is Type 1 channel access, the UE determines that the channel access priority CAPC for transmitting PUCCH is 1.
- C1 is specified by the protocol.
- the values of C2 and C3 are configured by high-level parameters.
- the value range of C2 and C3 is 1 to 28; when the subcarrier spacing is 60kHz, the value range of C2 and C3 is 2 to 28.
- Non-fallback uplink grant for scheduling PUSCH transmission (DCI format 0_1):
- the high-level configuration LBT parameter indication set includes at least one jointly coded channel access method, CPE length and CAPC.
- the non-fallback uplink authorization includes LBT indication information, and the LBT indication information is used to indicate the jointly coded channel access method, CPE length and CAPC from the above-mentioned LBT parameter indication set.
- the channel access method, CPE length and CAPC are used for PUSCH transmission. If the indicated channel access method is Type 2 channel access, the CAPC indicated at the same time is the CAPC used by the base station when obtaining the COT.
- the LBT indication information includes a maximum of 6 bits.
- Non-fallback downlink grant for scheduling PDSCH transmission (DCI format 1_1):
- the high-level configuration LBT parameter indication set includes at least one jointly coded channel access method and CPE length.
- the non-fallback downlink authorization includes LBT indication information, and the LBT indication information is used to indicate the jointly coded channel access method and CPE length from the above-mentioned LBT parameter indication set.
- the LBT indication information includes a maximum of 4 bits.
- the base station can also implicitly indicate the channel access mode within the COT.
- the UE receives an UL grant or DL grant sent by the base station indicating that the channel access type corresponding to the PUSCH or PUCCH is Type 1 channel access
- the UE can determine the PUSCH or PUCCH belongs to the COT of the base station.
- the UE receives DCI format 2_0 sent by the base station, and determines that the PUSCH or PUCCH belongs to the COT of the base station according to the DCI format 2_0.
- the UE can update the channel access type corresponding to the PUSCH or PUCCH to Type2A channel access instead of Type1 channel access.
- the mapping of S-SSB in the time-frequency domain is shown in Figure 16.
- S-SSB cycle 160ms
- the first-class S-SSB is the S-SSB time slot resource configured by R16/R17SL
- the second-class S-SSB is the additional S-SSB time slot resource newly defined by R18.
- the frequency domain resource corresponding to an S-SSB time slot if the frequency domain contains 4 resource block (RB) sets, the UE can try to map/transmit S-SSB on one or more of the RB sets.
- the attempt here means that the UE needs to perform LBT on an RB set first.
- the S-SSB is mapped/sent on the RB set. If it needs to be sent on multiple RB sets, then LBT is performed on the multiple RB sets respectively, and the LBT results on each RB set are used to determine whether the S-SSB can be sent on the corresponding RB set. In an RB set, S-SSB is repeatedly mapped in the frequency domain. In multiple RB sets corresponding to a time slot, the S-SSB is also repeated in each RB set.
- each R16/R17 S-SSB time slot corresponds to K additional S-SSB time slots, and the intervals between these S-SSB time slots need to be obtained through configuration or pre-configuration.
- A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B.
- the "correspondence" mentioned in the embodiments of the present application can mean that there is a direct or indirect correspondence relationship between the two, or it can mean that there is an association relationship between the two, or it can mean that there is an indication and being indicated, configuration and being configured, etc.
- predefined or “predefined rules” mentioned in the embodiments of the present application can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices), and the present application does not limit its specific implementation method.
- predefined may refer to the definition in the protocol.
- protocol may refer to a standard protocol in the field of communications, such as LTE protocols, NR protocols, and related protocols used in future communication systems, and the present application does not limit this.
- the embodiments of the present application do not limit the specific form of the terminal.
- the terminal in the embodiments of the present application may refer to an access terminal, a user equipment (UE), a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal device, a wireless communication device, a user agent or a user device.
- UE user equipment
- the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, an IoT device, a satellite handheld terminal, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolution network, etc.
- SIP Session Initiation Protocol
- IoT IoT device
- satellite handheld terminal a Wireless Local Loop (WLL) station
- PDA Personal Digital Assistant
- PDA Personal Digital Assistant
- the supported channel access methods include Type 1 (Type1) and Type 2A (Type2A) channel access methods; when the UE sends S-SSB on multiple channels, it is necessary to perform channel access on the multiple channels separately, and the supported multi-channel access methods include Type A (TypeA) and Type B (TypeB) channel access methods.
- the UE needs to independently perform Type1 channel access on the multiple channels. If the access is successful on any one or more of the channels, the UE can send S-SSB on the one or more channels.
- the UE can randomly select one channel from the multiple channels for Type1 channel access and the other channels for Type2 channel access. If the Type1 channel access is successful, the UE can send S-SSB on each channel where the channel access is successful; if the Type1 channel access fails, the multiple channels are considered unavailable.
- FIG17 is a schematic diagram showing an example of channel access using TypeA multi-channel access method in a scenario where other UEs share COT with the current UE.
- the UE independently uses Type1 channel access method to perform LBT channel sensing in each channel/RB set.
- the COT contains channel #2 (RB set #2) and channel #3 (RB set #3).
- the channel sensing time of the Type1 channel access process is very long, which is much longer than the channel sensing time of Type2A (25 ⁇ s)
- COT will be lost. Therefore, it is stipulated that in COT Type 2 channel access is required internally.
- the UE still uses Type 1 channel access according to the pre-planned plan, it will not be able to use the time and frequency resources within the COT duration. In this way, the probability of COT loss is greatly increased, resulting in a waste of resources.
- the longer the channel listening time the easier it is for resources to be occupied (for example, occupied by UEs of different systems).
- other UEs such as UEs of different systems
- use the Type 2A channel access method with a shorter listening time to access channels on channels #2 and #3 at this time there is a high probability that they will seize the COT resources. In this way, the current UE has to abandon the existing COT. If the current UE abandons the existing COT and re-initiates COT using the Type 1 channel listening method, the existing COT resources will be wasted.
- Figure 18 shows a schematic diagram of an example of channel access using Type B multi-channel access in a scenario where other UEs share COT with the current UE.
- the UE selects one channel from a set of channels/RB sets to use Type 1 channel access, and other channels use Type 2 channel access.
- the UE selects channel #2 (RB set #2) to use Type 1 channel access, and channel #0 (RB set #0), channel #1 (RB set #1) and channel #3 (RB set #3) to use Type 2 channel access, and whether the channel using Type 2 channel access can be used to send S-SSB depends on whether Type 1 channel access is successful on channel #2, that is, the channel access correlation between different channels is very high.
- Type 1 channel access If the UE plans to use Type 1 channel access on channel #2 in advance, and COT shared resources appear after channel listening has started, it is impossible to switch from Type 1 channel access to Type 2 channel access. In this way, if other UEs (such as UEs from different systems) use Type 2A channel access with a shorter listening time to access channel #2 at this time, there is a high probability that the current UE will fail to access channel #2, resulting in the inability to send S-SSB on both channel #2 and channel #3, which will lead to the loss of COT.
- UEs such as UEs from different systems
- the purpose of supporting the transmission of S-SSB on multiple channels/RB sets is that when there are COT shared resources, in addition to being able to send S-SSB on the anchor channel/anchor RB set, the UE can also send S-SSB on the channel/RB set included in the COT, so as to maintain the occupation of the COT resources to avoid the COT resources being preempted by UEs of different systems, thereby ensuring the resource utilization efficiency of the current sideline system.
- the multi-channel access mechanism of Type A and Type B specified in the existing mechanism does not have an effective way to maintain the occupancy of COT for scenarios where COT shared resources appear before sending S-SSB, resulting in a high probability of COT loss (such as COT being preempted by UEs of different systems). This is contrary to the original intention of sending S-SSB on multiple channels/RB sets. Therefore, for scenarios where COT shared resources appear before sending S-SSB, how to avoid COT loss is an urgent problem to be solved.
- a first terminal may perform type 2 (Type 2) channel access on at least one first channel in a group of channels, and the obtained channel access result may be used to determine whether the at least one first channel may be used to send S-SSB in a first time slot, wherein the group of channels is a channel planned to send S-SSB in a first time slot, and the at least one first channel and the first time slot are included in the COT.
- Type 2 type 2
- type 2 channel access is performed on at least one first channel included in the COT, and based on the result of the channel access, it is determined whether the at least one first channel can be used for sending S-SSB.
- This is beneficial to increase the probability that the first terminal successfully accesses the at least one first channel and sends S-SSB on the at least one first channel, thereby helping to maintain the occupation of COT resources to avoid the loss of COT resources (such as avoiding the COT resources being preempted by users of other systems).
- performing channel access can also be replaced by “performing LBT” or “performing channel listening”.
- the "channel (such as the first channel)” in the embodiment of the present application can also be replaced by "RB set (such as the first RB set)”.
- FIG19 is a flow chart of a channel access method provided in an embodiment of the present application. As shown in FIG19 , the method may include the following steps:
- the first terminal performs type 2 channel access on at least one first channel in a group of channels, and the channel access result obtained by performing type 2 channel access on the at least one first channel is used to determine whether the at least one first channel can be used to send S-SSB in the first time slot; wherein, the group of channels is a channel planned to be used to send S-SSB in the first time slot, and the at least one first channel and the first time slot are included in the COT.
- the channel planned to be used to send S-SSB in the first time slot can also be understood as a predetermined/determined channel to be used to send S-SSB in the first time slot. That is to say, for a predetermined set of channels to be used to send S-SSB in the first time slot, the first terminal can use a channel access method of type 2 (such as Type 2A, Type 2B or Type 2C) on at least one first channel in the set of channels for channel access, and the at least one first channel is included in the COT.
- type 2 such as Type 2A, Type 2B or Type 2C
- the channel access result obtained by the first terminal performing type 2 channel access on the at least one first channel can be used to determine whether the at least one first channel can be used to send S-SSB in the first time slot. For example, for a first channel in the at least one first channel, if the result of the first terminal performing type 2 channel access on the first channel is successful, the first terminal can send S-SSB on the first channel, and the time slot for sending S-SSB is the first time slot; if the result of the first terminal performing type 2 channel access on the first channel is a failure, the first terminal cannot send S-SSB on the first channel in the first time slot.
- the S-SSB is repeatedly mapped in the frequency domain within a channel, that is, the S-SSB can be repeated multiple times (repeatedly mapped multiple times) within a channel
- sending an S-SSB on a channel can also be understood as sending multiple repeated S-SSBs on the channel.
- the first terminal can perform type 2 channel access on at least one first channel, and the obtained channel access result can be used to determine whether the at least one first channel can be used to send S-SSB in the first time slot. Since the channel listening time in the type 2 channel access process is short, performing type 2 channel access on at least one first channel included in the COT and determining whether the at least one first channel can be used to send S-SSB based on the result of the channel access is beneficial to improving the probability of the first terminal successfully accessing the at least one first channel and sending S-SSB on the at least one first channel, thereby facilitating the maintenance of COT resource occupation to avoid COT resource loss (such as avoiding COT resources being preempted by users of different systems).
- the first terminal may stop performing the type 1 channel access.
- the first terminal may stop performing type 1 channel access on all or part of the first channel when the first terminal obtains the time and frequency information of COT, and may abandon part/all of the channel listening results obtained in the process of performing type 1 channel access. Furthermore, the first terminal may wait until before the first time slot to perform type 2 channel access on all or part of the first channel to increase the probability of successful channel access, thereby reducing the probability of COT loss.
- the first terminal may not perform the type 1 channel access if at the first moment, the first terminal does not start to perform type 1 channel access on the whole or part of the first channel.
- starting to execute type 1 channel access can also be understood as starting to implement the channel listening process of type 1 channel access, or can also be understood as starting to execute type 1 channel listening.
- the first terminal can perform type 1 channel access on all or part of the first channel according to the pre-planned plan.
- the first terminal may use the channel access method of type 2 to perform channel Access.
- the device communicating with the first terminal may be a weak-capability device (such as a weak-capability terminal), and the weak-capability device may not be able to receive S-SSB on channels other than the anchor channel. Therefore, the first terminal can improve the probability of successfully accessing the anchor channel and sending S-SSB on the anchor channel by performing type 2 channel access on the anchor channel, thereby improving the probability that the weak-capability device receives the S-SSB sent by the first terminal.
- the method may also include: performing type 1 channel access on at least one second channel in the group of channels; wherein the COT does not include at least one second channel; and a channel access result obtained by performing type 1 channel access on the at least one second channel is used to determine whether the at least one second channel can be used to send S-SSB in the first time slot.
- the channel access result obtained by performing type 1 channel access on the at least one second channel can be used to determine whether the at least one second channel can be used to send S-SSB in the first time slot. For example, for a second channel in the at least one second channel, if the result of the first terminal performing type 1 channel access on the second channel is successful, the first terminal can send S-SSB on the second channel, and the time slot for sending S-SSB is the first time slot; if the result of the first terminal performing type 1 channel access on the second channel is a failure, the first terminal cannot send S-SSB on the second channel in the first time slot.
- the first terminal can send S-SSB on the second channel. That is to say, whether each second channel can be used to send S-SSB in the first time slot does not need to depend on whether the channel access result of another channel is successful.
- the channel access of each second channel can be performed independently, thereby increasing the probability of the first terminal successfully accessing the at least one second channel and sending S-SSB on the at least one second channel, thereby improving the transmission/detection effect of S-SSB.
- the at least one second channel is a non-anchor channel in the set of channels. That is, the first terminal may select at least one second channel from the non-anchor channels in the set of channels to perform type 1 channel access.
- the method may also include: performing type 2 channel access on at least one third channel in the group of channels; wherein the COT does not include the at least one second channel; and the channel access result obtained by performing type 2 channel access on the at least one third channel can be used to determine whether the at least one third channel can be used to send S-SSB in the first time slot.
- the first terminal can perform channel access of type 2 on the at least one third channel. For example, before the first moment, the first terminal has planned to perform channel access of type 2 on the at least one third channel, then, when the pre-planned moment of starting to perform channel access of type 2 comes, the first terminal can perform channel access of type 2 on the at least one third channel according to the pre-planned moment.
- the channel access result obtained by performing type 2 channel access on the at least one third channel can be used to determine whether the at least one third channel can be used to send S-SSB in the first time slot. For example, for a third channel among the at least one third channel, if the result of the first terminal performing type 2 channel access on the third channel is successful, the first terminal can send S-SSB on the third channel, and the time slot for sending S-SSB is the first time slot; if the result of the first terminal performing type 2 channel access on the third channel is failure, the first terminal cannot send S-SSB on the third channel in the first time slot.
- the first terminal can send S-SSB on the third channel. That is to say, whether each third channel can be used to send S-SSB in the first time slot does not need to depend on whether the channel access result of another channel is successful.
- the channel access of each third channel can be performed independently, thereby increasing the probability of the first terminal successfully accessing the at least one third channel and sending S-SSB on the at least one third channel, thereby improving the transmission/detection effect of S-SSB.
- the channel access method planned to be adopted may be type 1 signal access.
- the first terminal may plan/pre-plan to perform type 1 channel access on the target first channel; if the first terminal obtains the time-frequency information of the COT, the first terminal may change to type 2 channel access on the target first channel before the first time slot. For other first channels in the at least one first channel (other first channels except the target first channel), the first terminal may perform type 2 channel access before the first time slot according to the pre-planned plan. In this way, it is helpful to increase the probability of the first terminal successfully accessing the first channel included in the COT, thereby helping to avoid the loss of the COT resources.
- the first terminal may stop performing the type 1 channel access.
- the first terminal may stop performing type 1 channel access on the target first channel when the first terminal obtains the time-frequency information of COT. 1 channel access, and may abandon some/all channel listening results acquired in the process of executing the channel access of type 1. Further, the first terminal may wait until before the first time slot to perform the channel access of type 2 on the target first channel to increase the success probability of the channel access, thereby reducing the probability of COT loss.
- the first terminal may not perform the type 1 channel access if the first terminal does not start to perform type 1 channel access on the target first channel at the first moment.
- the first terminal may not need to perform the type 1 channel access on the target first channel, but may wait until before the first time slot to perform type 2 channel access on the target first channel, so as to increase the probability of successful channel access and thereby reduce the probability of COT loss.
- the time interval between the first moment (the moment when the first terminal obtains the time-frequency information of the COT) and the first time slot is greater than or equal to the duration required to perform type 2 channel access.
- the first terminal can stop the type 1 channel access being executed on the target first channel, or, it may not execute type 1 channel access on the target first channel according to the pre-planned plan, but wait until before the first time slot to execute type 2 channel access on the target first channel.
- the first terminal can perform type 1 channel access on the target first channel according to the pre-planned plan.
- the method may further include: the first terminal determines/judgments whether the time interval between the first moment and the first time slot is greater than or equal to the time required to perform channel access of type 2.
- the first terminal may decide whether to perform channel access of type 1 on the target first channel according to the pre-planned plan based on the judgment result.
- the target first channel is one of the non-anchor channels in the set of channels. That is, the first terminal may select a channel (such as the target first channel) from the non-anchor channels in the set of channels to perform type 1 channel access.
- the channel access result obtained by performing type 2 channel access on the at least one first channel mentioned above includes: the first channel access result obtained by performing type 2 channel access on the target first channel; when the first channel access result is successful, the channel access result obtained by performing type 2 channel access on the at least one first channel can be used to determine whether the at least one first channel can be used to send S-SSB in the first time slot.
- the first terminal can determine whether the at least one first channel can be used to send S-SSB in the first time slot based on the channel access result obtained by performing type 2 channel access on the at least one first channel.
- the method may further include: performing type 2 channel access on at least one fourth channel in the group of channels; wherein the COT does not include the at least one fourth channel; when the first channel access result is successful, the channel access result obtained by performing type 2 channel access on the at least one fourth channel can be used to determine whether the at least one fourth channel can be used to send S-SSB in the first time slot.
- the first terminal may perform channel access of type 2 on the at least one fourth channel. For example, before the first moment, the first terminal has planned to perform channel access of type 2 on the at least one fourth channel, then, when the pre-planned moment of starting to perform channel access of type 2 comes, the first terminal may perform channel access of type 2 on the at least one fourth channel according to the pre-planned moment.
- the channel access result obtained by performing type 2 channel access on the at least one fourth channel can be used to determine whether the at least one fourth channel can be used to send S-SSB in the first time slot. For example, when the first channel access result is successful, for a fourth channel among the at least one fourth channel, if the first terminal successfully performs type 2 channel access on the fourth channel, the first terminal can send S-SSB on the fourth channel, and the time slot for sending S-SSB is the first time slot; if the first terminal fails to perform type 2 channel access on the fourth channel, the first terminal cannot send S-SSB on the fourth channel in the first time slot.
- the group of channels is not used to send S-SSB in the first time slot. That is, whether at least one first channel and/or at least one fourth channel can be used to send S-SSB in the first time slot depends on whether the first channel access result is successful. For example, if the first channel access result is successful, at least one first channel and/or at least one fourth channel can be used to send S-SSB in the first time slot; if the first channel access result is a failure, the group of channels cannot be used to send S-SSB in the first time slot.
- the method may further include: performing type 2 channel access on at least one fourth channel in the set of channels; wherein the COT does not include the at least one fourth channel; performing type 2 channel access on the at least one fourth channel to obtain The channel access result can be used to determine whether the at least one fourth channel can be used to send S-SSB in the first time slot.
- the first terminal may perform channel access of type 2 on the at least one fourth channel. For example, before the first moment, the first terminal has planned to perform channel access of type 2 on the at least one fourth channel, then, when the pre-planned moment of starting to perform channel access of type 2 comes, the first terminal may perform channel access of type 2 on the at least one fourth channel according to the pre-planned moment.
- the channel access result obtained by performing type 2 channel access on the at least one fourth channel can be used to determine whether the at least one fourth channel can be used to send S-SSB in the first time slot. For example, for a fourth channel in the at least one fourth channel, if the result of the first terminal performing type 2 channel access on the fourth channel is successful, the first terminal can send S-SSB on the fourth channel, and the time slot for sending S-SSB is the first time slot; if the result of the first terminal performing type 2 channel access on the fourth channel is failure, the first terminal cannot send S-SSB on the fourth channel in the first time slot.
- the first terminal can send S-SSB on the fourth channel. That is to say, whether each fourth channel can be used to send S-SSB in the first time slot does not need to depend on whether the first channel access result is successful.
- the channel access of each fourth channel can be performed independently, thereby increasing the probability of the first terminal successfully accessing the at least one fourth channel and sending S-SSB on the at least one fourth channel, thereby improving the transmission/detection effect of S-SSB.
- the method may further include: the first terminal receives first information from the second terminal, the first information is used to share the COT with the first terminal, the first information includes time-frequency information of the COT, and the COT is initiated by the second terminal.
- the second terminal can share the COT initiated by the second terminal with the first terminal by sending the first information to the first terminal, and can carry the time-frequency information of the COT in the first information. Accordingly, the first terminal can obtain the time-frequency information of the COT by receiving the first information. Based on the time-frequency information of the COT, the first terminal can know which channels and time slots are included in the COT.
- the first terminal can know that at least one first channel and a first time slot are included in the COT based on the time-frequency information of the COT, so that the first terminal can perform type 2 channel access on the at least one first channel to increase the probability of the first terminal successfully accessing the at least one first channel and sending S-SSB on the at least one first channel, thereby avoiding the loss of COT resources.
- Type 1 channel access may include the following two cases:
- Case #1 Type 1 channel access is planned, but channel listening has not yet been implemented
- Case #2 The channel sensing process for Type 1 channel access has already started.
- the UE has already started the channel sensing process of Type 1 channel access on channel Ci .
- the UE can switch to the channel access mode of Type 2 (2A, 2B or 2C).
- the UE when the UE implements Type 1 channel access on channel Ci , if the COT information is obtained at time t1 (corresponding to the first time in the above embodiment), the UE can stop Type 1 channel access/channel sensing at time t1, and start Type 2 (2A, 2B or 2C) channel access/channel sensing at time t2 before time slot n. The UE can ignore the Type 1 channel sensing results (partial/full channel sensing results) that have been obtained.
- the UE can continue and complete the currently being implemented Type1 channel access process, and use the Type1 channel listening result (if successful) to access the channel.
- FIG20 shows an example of solution 1.
- the multi-channel access method that the UE plans to adopt is Type A multi-channel access.
- the process shown in FIG20 may include the following steps S201 to S204:
- the UE plans/decides that the frequency domain resources for sending S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, RB set #2 and RB set #3, and can determine how many repeated S-SSBs are sent on each RB set, as well as the interval between adjacent S-SSBs in one RB set, etc.
- RB set #0 is the anchor RB set
- RB set #1, RB set #2 and RB set #3 are non-anchor RB sets.
- S202 UE performs Type 1 channel access/LBT.
- the UE may perform channel access using the multi-channel access method of Type A. That is, the UE may independently perform channel access/LBT using the channel access method of Type 1 on RB set #0, RB set #1, RB set #2, and RB set #3.
- the UE changes to using the Type 2 channel access mode for channel sensing on the RB set included in the COT.
- the UE obtains COT information at time t1 , and based on the COT information, the UE can know that RB set #2 and RB set #3 are included in the COT. Further, the UE can change to using Type 2 channel access mode for channel sensing on RB set #2 and RB set #3. For example, the UE can stop Type 1 channel access at time t1 , and start Type 2 channel access at time t2 before time slot n.
- FIG21 shows another example of solution 1.
- the multi-channel access method that the UE plans to adopt is Type A multi-channel access.
- the process shown in FIG21 may include the following steps S211 to S214:
- the UE plans/decides that the frequency domain resources for sending S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, RB set #2 and RB set #3, and can determine how many repeated S-SSBs are sent on each RB set, as well as the interval between adjacent S-SSBs in one RB set, etc.
- RB set #0 is the anchor RB set
- RB set #1, RB set #2 and RB set #3 are non-anchor RB sets.
- the UE may wait until time t2 before time slot n and start performing Type 2 channel access on RB set #2 and RB set #3.
- the time when the UE obtains the COT information is t 13.
- the time interval between t 13 and time slot n is not enough to perform the Type 2 channel access process, that is, at this time, no matter whether the UE continues to perform Type 1 channel listening, there is not enough time to perform the Type 2 channel access process before time slot n. Therefore, in this case, the UE can perform the Type 1 channel access method that has been performed.
- the UE can select any channel Ci from the non-anchor channels and use the Type 1 channel access method (that is, select any RB set from the non-anchor RB set and use the Type 1 channel access method).
- Other channels (RB sets) use the Type 2 channel access method.
- Type 1 channel access may include the following two cases:
- Case #3 Type 1 channel access is planned, but channel listening has not yet been implemented
- Case #4 The channel sensing process for Type 1 channel access has already started.
- the UE has already started the channel sensing process of Type 1 channel access on channel Ci .
- the UE can switch to Type 2 (2A, 2B or 2C) channel access mode.
- the UE when the UE implements Type 1 channel access on channel Ci , if the COT information is obtained at time t1 (corresponding to the first time in the above embodiment), the UE can stop Type 1 channel access/channel sensing at time t1, and start Type 2 (2A, 2B or 2C) channel access/channel sensing at time t2 before time slot n. The UE can ignore the Type 1 channel sensing results (partial/full channel sensing results) that have been obtained.
- the UE can continue and complete the currently being implemented Type1 channel access process, and use the Type1 channel listening result (if successful) to access the channel.
- the UE if it successfully accesses a channel on a certain channel, it can send an S-SSB on the channel, and the time slot for sending the S-SSB is time slot n.
- the channel access of each channel can be performed independently without relying on whether the channel access of channel C i is successful.
- other channels can only determine whether they can access the channel and send S-SSB according to their respective channel access results if channel C i successfully performs channel access. In other words, whether other channels can be used to send S-SSB in time slot n depends on whether channel C i successfully accesses the channel. If channel access fails on channel C i , none of the C channels can be used to send S-SSB.
- FIG22 shows an example of solution 2.
- the multi-channel access method that the UE plans to adopt is Type B multi-channel access.
- the process shown in FIG22 may include the following steps S221 to S224:
- the UE plans/decides that the frequency domain resources for sending S-SSB in time slot n (S-SSB time slot n) include RB set #0, RB set #1, RB set #2 and RB set #3, and can determine how many repeated S-SSBs are sent on each RB set, as well as the interval between adjacent S-SSBs in one RB set, etc.
- RB set #0 is the anchor RB set
- RB set #1, RB set #2 and RB set #3 are non-anchor RB sets.
- the UE performs Type 1 channel access/LBT on RB set #2.
- the UE may, for example, plan to use the channel access method of Type 1 on RB set #2, and use the channel access method of Type 2 on other RB sets.
- the time when the UE obtains the COT information is time t11 . That is, at time t11 , the UE can learn that RB set #2 and RB set #3 are included in the COT based on the COT information. As shown in FIG22, time t11 is before the time when the planned Type 1 channel access starts, that is, at time t11 , the UE has not started to perform Type 1 channel access on RB set #2 as planned. In this case, when the planned Type 1 channel access starts, the UE no longer performs Type 1 channel access on RB set #2.
- the time when the UE obtains the COT information is t12 or t13 . That is, at t12 or t13 , the UE can learn that RB set #2 and RB set #3 are included in the COT based on the COT information. As shown in FIG22, t12 and t13 are after the time when the UE plans to start performing Type1 channel access. That is, at the time when the UE plans to start performing Type1 channel access, the UE has not yet learned the time-frequency information of the COT. In this case, the UE can perform Type1 channel access as planned on RB set #2.
- S223, UE performs Type 2 channel access/LBT.
- the UE can wait until time t2 before time slot n and start to perform Type 2 on RB set #0 to RB set #3. Channel access.
- the time when the UE obtains the COT information is t13 .
- the time interval between t13 and time slot n is not enough to perform the Type2 channel access process. Therefore, in this case, the UE can continue to complete the Type1 channel access on RB set #2.
- the UE can start performing Type2 channel access at t2 as planned on RB set #0, RB set #1 and RB set #3.
- the UE if it successfully accesses the channel on a certain RB set, it can send S-SSB on the channel, and the time slot for sending the S-SSB is time slot n.
- the channel access of each RB set can be performed independently without relying on whether the channel access of RB set #2 is successful.
- other RB sets can determine whether they can access the channel and send S-SSB according to their respective channel access results only when the channel access of RB set #2 is successful. In other words, whether other RB sets can be used to send S-SSB in time slot n depends on whether the channel access of RB set #2 is successful. If the channel access of RB set #2 fails, RB set #0 to RB set 3 cannot be used for sending S-SSB.
- the UE when the UE adopts a multi-channel access mechanism, in the case of an existing channel access type plan, if the UE obtains the COT time-frequency information, it can decide whether to switch to a new channel access type (for example, switch from Type 1 channel access to Type 2 channel access) based on the time of obtaining the COT time-frequency information and the remaining time before sending the S-SSB. If there is a correlation between the channels originally planned for multi-channel access, then after switching to a new channel access type, the correlation may disappear automatically, or the correlation may still exist.
- This method increases the probability of channel access by switching the channel access type, while maintaining the existing COT resources to avoid preemption by users of different systems, thereby ensuring the reliability of the sidelink resources in the unlicensed frequency band.
- downlink indicates that the transmission direction of the signal or data
- uplink is used to indicate that the transmission direction of the signal or data is the second direction sent from the user equipment of the cell to the site
- side is used to indicate that the transmission direction of the signal or data is the third direction sent from user equipment 1 to user equipment 2.
- downlink signal indicates that the transmission direction of the signal is the first direction.
- the processing unit 2301 is further configured to perform type 1 channel access on at least one second channel in a group of channels; wherein the COT does not include at least one second channel; and a channel access result obtained by performing type 1 channel access on at least one second channel is used to determine whether the at least one second channel can be used to send S-SSB in the first time slot.
- the processing unit 2301 is further configured to: if at a first moment, type 1 channel access has been started on the target first channel, then at the first moment, stop executing type 1 channel access; wherein the target first channel is one of the at least one first channels, and the first moment is the moment of acquiring the time-frequency information of the COT.
- Fig. 24 is a schematic structural diagram of a communication device 2400 provided in an embodiment of the present application.
- the communication device 2400 shown in Fig. 24 includes a processor 2410, and the processor 2410 can call and run a computer program from a memory to implement the method in the embodiment of the present application.
- the communication device 2400 may further include a memory 2420.
- the processor 2410 may call and run a computer program from the memory 2420 to implement the method in the embodiment of the present application.
- the memory 2420 may be a separate device independent of the processor 2410 , or may be integrated into the processor 2410 .
- the communication device 2400 may further include a transceiver 2430 , and the processor 2410 may control the transceiver 2430 to communicate with other devices, specifically, may send information or data to other devices, or receive information or data sent by other devices.
- the transceiver 2430 may include a transmitter and a receiver.
- the transceiver 2430 may further include an antenna, and the number of antennas may be one or more.
- the communication device 2400 may specifically be a terminal (such as a first terminal) of an embodiment of the present application, and the communication device 2400 may implement the corresponding processes implemented by the terminal (such as a first terminal) in each method of the embodiment of the present application, which will not be described herein for the sake of brevity.
- FIG25 is a schematic structural diagram of a chip according to an embodiment of the present application.
- the chip 2500 shown in FIG25 includes a processor 2510.
- the processor 2510 The computer program can be called and executed from the memory to implement the method in the embodiment of the present application.
- the chip 2500 may further include a memory 2520.
- the processor 2510 may call and run a computer program from the memory 2520 to implement the method in the embodiment of the present application.
- the memory 2520 may be a separate device independent of the processor 2510 , or may be integrated into the processor 2510 .
- the chip 2500 may further include an input interface 2530.
- the processor 2510 may control the input interface 2530 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.
- the chip 2500 may further include an output interface 2540.
- the processor 2510 may control the output interface 2540 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.
- the chip can be applied to the terminal (such as the first terminal) in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the terminal (such as the first terminal) in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.
- the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.
- the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities.
- each step of the above method embodiment can be completed by the hardware integrated logic circuit in the processor or the instruction in the form of software.
- the above processor can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- FPGA Field Programmable Gate Array
- the methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed.
- the general processor can be a microprocessor or the processor can also be any conventional processor, etc.
- the steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to execute, or the hardware and software modules in the decoding processor can be executed.
- the software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc.
- the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
- RAM Direct Rambus RAM
- SRAM Static RAM
- DRAM Dynamic RAM
- SDRAM Synchronous DRAM
- DDR SDRAM Double Data Rate SDRAM
- ESDRAM Enhanced SDRAM
- SLDRAM Synchlink DRAM
- DR RAM Direct Rambus RAM
- the embodiment of the present application also provides a computer program product, including computer program instructions.
- the computer program product can be applied to the terminal (such as the first terminal) in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding process implemented by the terminal (such as the first terminal) in each method of the embodiment of the present application, which will not be described here for brevity.
- each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
- the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art.
- the computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application.
- the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.
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Abstract
Description
Claims (43)
- 一种信道接入方法,应用于第一终端,所述方法包括:在一组信道中的至少一个第一信道上执行类型2的信道接入,在所述至少一个第一信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第一信道是否可用于在第一时隙发送侧行链路同步信号块S-SSB;其中,所述一组信道为计划用于在所述第一时隙发送S-SSB的信道,所述至少一个第一信道和所述第一时隙包含在信道占用时间COT内。
- 根据权利要求1所述的方法,其中,所述方法还包括:若在第一时刻,已开始在所述至少一个第一信道中的全部或部分第一信道上执行类型1的信道接入,则在所述第一时刻,停止执行所述类型1的信道接入;所述第一时刻为获取所述COT的时频信息的时刻。
- 根据权利要求1所述的方法,其中,所述方法还包括:若在第一时刻,未开始在所述至少一个第一信道中的全部或部分第一信道上执行类型1的信道接入,则不执行所述类型1的信道接入;所述第一时刻为获取所述COT的时频信息的时刻。
- 根据权利要求2或3所述的方法,其中,在所述第一时刻之前,对于所述全部或部分第一信道,计划采用的信道接入方式为类型1的信道接入。
- 根据权利要求2至4中任一项所述的方法,其中,所述全部或部分第一信道为所述一组信道中的非锚点信道。
- 根据权利要求1至5中任一项所述的方法,其中,所述方法还包括:在所述一组信道中的至少一个第二信道上执行类型1的信道接入;其中,所述COT不包含所述至少一个第二信道;在所述至少一个第二信道上执行类型1的信道接入得到的信道接入结果,用于确定所述至少一个第二信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求6所述的方法,其中,所述至少一个第二信道为所述一组信道中的非锚点信道。
- 根据权利要求1至7中任一项所述的方法,其中,所述方法还包括:在所述一组信道中的至少一个第三信道上执行类型2的信道接入;其中,所述COT不包含所述至少一个第二信道;在所述至少一个第三信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第三信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求1所述的方法,其中,所述方法还包括:若在第一时刻,已开始在目标第一信道上执行类型1的信道接入,则在所述第一时刻,停止执行所述类型1的信道接入;其中,所述目标第一信道是所述至少一个第一信道中的其中一个第一信道,所述第一时刻为获取所述COT的时频信息的时刻。
- 根据权利要求1所述的方法,其中,所述方法还包括:若在第一时刻,未开始在目标第一信道上执行类型1的信道接入,则不执行所述类型1的信道接入;其中,所述目标第一信道是所述至少一个第一信道中的其中一个第一信道,所述第一时刻为获取所述COT的时频信息的时刻。
- 根据权利要求9或10所述的方法,其中,在所述第一时刻之前,对于所述目标第一信道,计划采用的信道接入方式为类型1的信接入。
- 根据权利要求9至11中任一项所述的方法,其中,所述目标第一信道为所述一组信道中的其中一个非锚点信道。
- 根据权利要求9至12中任一项所述的方法,其中,在所述至少一个第一信道上执行类型2的信道接入得到的信道接入结果,包括:在所述目标第一信道上执行类型2的信道接入得到的第一信道接入结果;在所述第一信道接入结果为成功的情况下,在所述至少一个第一信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第一信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求13所述的方法,其中,所述方法还包括:在所述一组信道中的至少一个第四信道上执行类型2的信道接入;其中,所述COT不包含所述至少一个第四信道;在所述第一信道接入结果为成功的情况下,在所述至少一个第四信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第四信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求13或14所述的方法,其中,在所述第一信道接入结果为失败的情况下,所述一组信道不用于在所述第一时隙发送S-SSB。
- 根据权利要求9至12中任一项所述的方法,其中,所述方法还包括:在所述一组信道中的至少一个第四信道上执行类型2的信道接入;其中,所述COT不包含所述至少一个第四信道;在所述至少一个第四信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第四信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求2至5、9至16中任一项所述的方法,其中,所述第一时刻与所述第一时隙之间的时间间隔,大于或等于执行类型2的信道接入所需的时长。
- 根据权利要求2至5、9至17中任一项所述的方法,其中,所述方法还包括:确定所述第一时刻与所述第一时隙之间的时间间隔,是否大于或等于执行类型2的信道接入所需的时长。
- 根据权利要求1至18中任一项所述的方法,其中,所述方法还包括:接收来自第二终端的第一信息,所述第一信息用于向所述第一终端共享所述COT,所述第一信息包括所述COT的时频信息,所述COT由所述第二终端发起。
- 一种信道接入装置,所述装置包括:处理单元,被配置为在一组信道中的至少一个第一信道上执行类型2的信道接入,在所述至少一个第一信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第一信道是否可用于在第一时隙发送侧行链路同步信号块S-SSB;其中,所述一组信道为计划用于在所述第一时隙发送S-SSB的信道,所述至少一个第一信道和所述第一时隙包含在信道占用时间COT内。
- 根据权利要求20所述的装置,其中,所述处理单元,还被配置为:若在第一时刻,已开始在所述至少一个第一信道中的全部或部分第一信道上执行类型1的信道接入,则在所述第一时刻,停止执行所述类型1的信道接入;所述第一时刻为获取所述COT的时频信息的时刻。
- 根据权利要求20所述的装置,其中,所述处理单元,还被配置为:若在第一时刻,未开始在所述至少一个第一信道中的全部或部分第一信道上执行类型1的信道接入,则不执行所述类型1的信道接入;所述第一时刻为获取所述COT的时频信息的时刻。
- 根据权利要求21或22所述的装置,其中,在所述第一时刻之前,对于所述全部或部分第一信道,计划采用的信道接入方式为类型1的信道接入。
- 根据权利要求21至23中任一项所述的装置,其中,所述全部或部分第一信道为所述一组信道中的非锚点信道。
- 根据权利要求20至24中任一项所述的装置,其中,所述处理单元,还被配置为在所述一组信道中的至少一个第二信道上执行类型1的信道接入;其中,所述COT不包含所述至少一个第二信道;在所述至少一个第二信道上执行类型1的信道接入得到的信道接入结果,用于确定所述至少一个第二信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求25所述的装置,其中,所述至少一个第二信道为所述一组信道中的非锚点信道。
- 根据权利要求20至26中任一项所述的装置,其中,所述处理单元,还被配置为在所述一组信道中的至少一个第三信道上执行类型2的信道接入;其中,所述COT不包含所述至少一个第二信道;在所述至少一个第三信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第三信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求20所述的装置,其中,所述处理单元,还被配置为:若在第一时刻,已开始在目标第一信道上执行类型1的信道接入,则 在所述第一时刻,停止执行所述类型1的信道接入;其中,所述目标第一信道是所述至少一个第一信道中的其中一个第一信道,所述第一时刻为获取所述COT的时频信息的时刻。
- 根据权利要求20所述的装置,其中,所述处理单元,还被配置为:若在第一时刻,未开始在目标第一信道上执行类型1的信道接入,则不执行所述类型1的信道接入;其中,所述目标第一信道是所述至少一个第一信道中的其中一个第一信道,所述第一时刻为获取所述COT的时频信息的时刻。
- 根据权利要求28或29所述的装置,其中,在所述第一时刻之前,对于所述目标第一信道,计划采用的信道接入方式为类型1的信接入。
- 根据权利要求28至30中任一项所述的装置,其中,所述目标第一信道为所述一组信道中的其中一个非锚点信道。
- 根据权利要求28至31中任一项所述的装置,其中,在所述至少一个第一信道上执行类型2的信道接入得到的信道接入结果,包括:在所述目标第一信道上执行类型2的信道接入得到的第一信道接入结果;在所述第一信道接入结果为成功的情况下,在所述至少一个第一信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第一信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求32所述的装置,其中,所述处理单元,还被配置为在所述一组信道中的至少一个第四信道上执行类型2的信道接入;其中,所述COT不包含所述至少一个第四信道;在所述第一信道接入结果为成功的情况下,在所述至少一个第四信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第四信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求32或33所述的装置,其中,在所述第一信道接入结果为失败的情况下,所述一组信道不用于在所述第一时隙发送S-SSB。
- 根据权利要求28至31中任一项所述的装置,其中,所述处理单元,还被配置为在所述一组信道中的至少一个第四信道上执行类型2的信道接入;其中,所述COT不包含所述至少一个第四信道;在所述至少一个第四信道上执行类型2的信道接入得到的信道接入结果,用于确定所述至少一个第四信道是否可用于在所述第一时隙发送S-SSB。
- 根据权利要求21至24、28至35中任一项所述的装置,其中,所述第一时刻与所述第一时隙之间的时间间隔,大于或等于执行类型2的信道接入所需的时长。
- 根据权利要求21至24、28至36中任一项所述的装置,其中,所述处理单元,还被配置为确定所述第一时刻与所述第一时隙之间的时间间隔,是否大于或等于执行类型2的信道接入所需的时长。
- 根据权利要求20至37中任一项所述的装置,其中,所述装置还包括:通信单元,被配置为接收来自第二终端的第一信息,所述第一信息用于向所述第一终端共享所述COT,所述第一信息包括所述COT的时频信息,所述COT由所述第二终端发起。
- 一种终端,包括:处理器和存储器,该存储器用于存储计算机程序,所述处理器用于调用并运行所述存储器中存储的计算机程序,执行如权利要求1至19中任一项所述的方法。
- 一种芯片,包括:处理器,用于从存储器中调用并运行计算机程序,使得安装有所述芯片的设备执行如权利要求1至19中任一项所述的方法。
- 一种计算机可读存储介质,用于存储计算机程序,所述计算机程序使得计算机执行如权利要求1至19中任一项所述的方法。
- 一种计算机程序产品,包括计算机程序指令,该计算机程序指令使得计算机执行如权利要求1至19中任一项所述的方法。
- 一种计算机程序,所述计算机程序使得计算机执行如权利要求1至19中任一项所述的方法。
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| EP23961995.0A EP4730902A1 (en) | 2023-12-22 | 2023-12-22 | Channel access method and apparatus, terminal, chip and storage medium |
| CN202380100409.8A CN121587078A (zh) | 2023-12-22 | 2023-12-22 | 一种信道接入方法、装置、终端、芯片和存储介质 |
| PCT/CN2023/141193 WO2025129673A1 (zh) | 2023-12-22 | 2023-12-22 | 一种信道接入方法、装置、终端、芯片和存储介质 |
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| WO2021237607A1 (zh) * | 2020-05-28 | 2021-12-02 | Oppo广东移动通信有限公司 | 一种同步信号块ssb的传输方法及终端设备 |
| CN115866758A (zh) * | 2022-06-30 | 2023-03-28 | 中兴通讯股份有限公司 | 一种信息发送方法,通信节点及存储介质 |
| CN116600410A (zh) * | 2023-02-10 | 2023-08-15 | 侯威 | 一种用户设备间共享信道占用的方法和设备 |
| WO2023159484A1 (zh) * | 2022-02-25 | 2023-08-31 | Oppo广东移动通信有限公司 | 信道侦听方法和通信设备 |
| CN116963023A (zh) * | 2022-04-12 | 2023-10-27 | 维沃移动通信有限公司 | 信道传输方法及装置、终端 |
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- 2023-12-22 WO PCT/CN2023/141193 patent/WO2025129673A1/zh active Pending
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| WO2021237607A1 (zh) * | 2020-05-28 | 2021-12-02 | Oppo广东移动通信有限公司 | 一种同步信号块ssb的传输方法及终端设备 |
| WO2023159484A1 (zh) * | 2022-02-25 | 2023-08-31 | Oppo广东移动通信有限公司 | 信道侦听方法和通信设备 |
| CN116963023A (zh) * | 2022-04-12 | 2023-10-27 | 维沃移动通信有限公司 | 信道传输方法及装置、终端 |
| CN115866758A (zh) * | 2022-06-30 | 2023-03-28 | 中兴通讯股份有限公司 | 一种信息发送方法,通信节点及存储介质 |
| CN116600410A (zh) * | 2023-02-10 | 2023-08-15 | 侯威 | 一种用户设备间共享信道占用的方法和设备 |
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