WO2023165416A1 - 通信方法、装置及系统 - Google Patents
通信方法、装置及系统 Download PDFInfo
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Classifications
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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
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
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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
Definitions
- This application relates to the field of communication. In particular, it relates to a communication method, device and system.
- a wireless communication system In a wireless communication system, according to different frequency bands used, it can be divided into licensed frequency bands and unlicensed frequency bands. It is an important evolution direction to enable sidelink (SL) communication in unlicensed frequency bands in the local space.
- SL sidelink
- UE user equipment
- UEs that urgently need to send data may not be able to compete for resources and cannot meet business needs, seriously affecting users. experience. Therefore, how to send the data to be transmitted in a timely manner to meet business requirements is an urgent problem to be solved.
- the embodiment of the present application proposes a communication method, device and system, and the method can send data in time to meet service requirements.
- a communication method may include: a first terminal device receives first indication information from a second terminal device, the first indication information is used to indicate a first resource, and the first resource is the second The resource reserved by the terminal device for sending the first data, the resource corresponding to the first resource in the frequency domain belongs to the first channel, the first terminal device determines the second resource according to the first indication information, the first terminal device Send the second data on the second resource, the start time unit of the second resource is after the end time unit of the first resource, the resource corresponding to the second resource in the frequency domain belongs to the first channel, and the first resource The terminal device sends the second data on a second resource whose start time unit is after the end time unit of the first resource.
- the first terminal device delays access to the channel, and timely avoids the second terminal device at the opportunity of accessing the channel, so that the second terminal device can use reserved resources to send data, reducing the data transmission delay and meeting business needs. , improving communication efficiency.
- the state of the first terminal device listening to the first channel through a listen-before-talk process in the first listening time unit is idle, and according to the first resource
- the listen-before-talk process is suspended at the first listening time unit, which is before the start time unit of the first resource.
- the duration between the start time unit of the first resource and the first listening time unit whose value of the counter is M is less than or equal to the first A threshold, where the first threshold is greater than 0 and less than the delay requirement of the second data.
- the time period during which the first terminal device suspends the decrement counter is less than a certain threshold, and since neither the first terminal device nor the second terminal device accesses the channel during this time period, the duration of this time period is limited, which can avoid resource waste.
- the first terminal device stops decrementing after decrementing the value of the counter to M, where 1 ⁇ M ⁇ Q, where Q is the initial value of the counter .
- the first threshold is determined according to a duration corresponding to the second resource in the time domain.
- the first terminal device listens to the first channel as idle in the second listening time unit, and continues to decrement the value of the counter from M,
- the second listening time unit is after the end time unit of the first resource, and the start time unit of the second resource is the time unit when the value of the counter is decremented to 0.
- the first terminal device can access the channel after the data transmission of the second terminal device is completed, and the data to be sent by the first terminal device can be sent normally, which can further meet business needs and avoid wasting data sent by the second terminal device
- the time-frequency resource after the used resource can be used for the first terminal device to access the channel after the data transmission of the second terminal device.
- the first terminal device receives a first reference signal from the second terminal device, and the first terminal device determines that the power of the first reference signal received is greater than or equal to Reference signal received power threshold.
- the first terminal device After the first terminal device shares resources with the second terminal device, if the reference signal received power of the second terminal device is lower than the threshold, other devices near the first terminal device cannot be silenced, and the channel may be occupied by other devices. The terminal device cannot re-access the channel within this resource. Therefore, when the reference signal received power of the second terminal device is greater than or equal to the reference signal received power threshold, the first terminal device determines to avoid, which can prevent the resources after the first terminal device avoids being preempted by devices other than the second terminal device, and improve The success rate of channel access by the second terminal device is improved, and the communication efficiency is further improved.
- the first terminal device receives third indication information from the second terminal device, and the third indication information is used to indicate that the first terminal device is the second terminal device The destination to which a terminal device sends data.
- the first terminal device when the first terminal device is the data receiving end (destination end) of the second terminal device, the first terminal device avoids the second terminal device, and can receive the data in time to meet business needs.
- the first terminal device receives fourth indication information from the second terminal device, where the fourth indication information is used to indicate the priority of the first data, and the first A terminal device determines that the priority of the first data is higher than or equal to the priority of the second data.
- the first terminal device avoids the device corresponding to the higher priority data, so that the service demand of the high priority data can be met in time.
- the first indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device.
- the third indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the fourth indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- indication information may also be carried in signaling configured by other network devices, or pre-configured signaling.
- a communication method may include: a first terminal device receives first indication information from a second terminal device, the first indication information is used to indicate a first resource, and the first resource is the second The resource reserved by the terminal device for sending the first data, the first terminal device determines a third resource according to the first resource and the first channel occupancy time, and the third resource belongs to the first resource and the first channel occupancy time , the third resource is used by the second terminal device to send data, the first terminal device sends data on a fourth resource, and the fourth resource belongs to resources other than the third resource within the first channel occupation time.
- the first channel occupation time may be a duration corresponding to the fifth resource in the time domain.
- the first terminal device receives first indication information from the second terminal device, where the first indication information is used to indicate a first resource, and the first resource is a resource reserved by the second terminal device for sending the first data , the first terminal device determines a fifth resource, the start time unit of the fifth resource is before the start time unit of the first resource, the fifth resource overlaps with the first resource, and the first terminal device according to The first resource and the fifth resource determine a third resource, the third resource belongs to the overlapping part of the first resource and the fifth resource, the third resource is used for the second terminal device to send the first data, the first The terminal device sends the second data on the fourth resource, and the fourth resource belongs to a part of the fifth resource except the third resource.
- the first terminal device shares resources with the second terminal device, so that the data of the second terminal device can be sent in time, and service requirements are met.
- the first terminal device sends second indication information to the second terminal device, where the second indication information is used to indicate the third resource.
- the first terminal device indicates the shared resource to the second terminal device, so that the second terminal device can quickly determine the resource, and further reduces the time delay for the second terminal device to send data.
- the first terminal device sends the second indication information to the second terminal device within a first period, and the first period begins at the fourth
- the start time unit of the resource is within the range of the start time unit of the third resource, and the duration between the start time of the first period and the start time unit of the fourth resource is greater than or equal to a second threshold.
- the second threshold may be T proc,0 .
- the first terminal device needs to ensure that there is enough time to send the first indication information and the second terminal has enough time to decode the indication information before sharing resources, otherwise the first indication information cannot be sent, or the second terminal device cannot The location of the resource is known, and neither the first terminal device nor the second terminal device uses the third resource at this time, and this method avoids waste of resources in this case.
- the first terminal device receives third indication information from the second terminal device, and the third indication information is used to indicate that the first terminal device is the second terminal device The destination to which a terminal device sends data.
- the first terminal device When the first terminal device is the data receiving end (destination end) of the second terminal device, the first terminal device shares resources with the second terminal device, and can receive the data in time to meet service requirements.
- the first terminal device receives fourth indication information from the second terminal device, where the fourth indication information is used to indicate the priority of the first data, the The first terminal device determines that the priority of the first data is higher than or equal to the priority of the second data.
- the first terminal device shares resources for devices corresponding to higher-priority data, so that service requirements for high-priority data can be met in a timely manner.
- the first terminal device receives a first reference signal from the second terminal device, and the first terminal device determines that the power of the first reference signal received is greater than or equal to Reference signal received power threshold.
- the first terminal device After the first terminal device shares resources with the second terminal device, if the reference signal received power of the second terminal device is lower than the threshold, other devices near the first terminal device cannot be silenced, and the channel may be occupied by other devices. The terminal device cannot re-access the channel within this resource. Therefore, when the reference signal received power of the second terminal device is greater than or equal to the reference signal received power threshold, the first terminal device determines to avoid, which can prevent the resources after the first terminal device avoids being preempted by devices other than the second terminal device, and improve The success rate of channel access by the second terminal device is improved, and the communication efficiency is further improved.
- the first indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink medium access control control element or radio resource control signaling.
- the second indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the first terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the third indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the fourth indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- indication information may also be carried in signaling configured by other network devices, or pre-configured signaling.
- a communication method may include: a second terminal device sends first indication information, where the first indication information is used to indicate a first resource, and the first resource is reserved by the second terminal device. Based on the resource for sending the first data, the second terminal device sends the first data on the third resource, the third resource is determined according to the first resource and the first channel occupation time, and the third resource belongs to the first A resource and a first channel occupancy time. The start time unit of the first occupied channel is before the start time unit of the first resource.
- the second terminal device receives second indication information from the first terminal device, where the second indication information is used to indicate the third resource.
- the second terminal device receives the second indication information from the first terminal device during a first period, and the start time of the first period is at the fourth resource and the starting time unit of the third resource, and the duration between the starting time of the first time period and the starting time unit of the fourth resource is greater than or equal to the second threshold.
- the second threshold may be T proc,0 .
- the second terminal device sends third indication information, where the third indication information is used to indicate the purpose of the first terminal device sending data for the second terminal device end.
- the second terminal device sends the first reference signal.
- the first indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device.
- Sidelink Media Access Control control element or at least one of PC5 radio resource control signaling is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device.
- the second indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the first terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the third indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the fourth indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink medium access control control element or radio resource control signaling.
- the third aspect is an implementation of the second terminal device corresponding to the first terminal device in the second aspect, and the explanations, supplements, and beneficial effects of the second aspect are also applicable to the third aspect, and will not be repeated here.
- a communication device in a fourth aspect, includes a transceiver unit and a processing unit, the transceiver unit is used to receive first indication information from a second terminal device, the first indication information is used to indicate a first resource, the first A resource is a resource reserved by the second terminal device for sending the first data, a resource corresponding to the first resource in the frequency domain belongs to the first channel, and the processing unit is configured to determine the second resource according to the first indication information, The transceiver unit is further configured to send second data on a second resource, the start time unit of the second resource is after the end time unit of the first resource, and the resource corresponding to the second resource in the frequency domain belongs to the first resource channel.
- the processing unit is configured to detect that the state of the first channel is idle through a listen-before-talk process at the first listening time unit, and the processing unit is also configured to The listen-before-talk process is suspended according to the first resource at the first listening time unit, which is before the start time unit of the first resource.
- the duration between the start time unit of the first resource and the first listening time unit whose value of the counter is M is less than or equal to the first A threshold, where the first threshold is greater than 0 and less than the delay requirement of the second data.
- the processing unit is configured to stop decrementing after decrementing the value of the counter to M, where 1 ⁇ M ⁇ Q, where Q is the initial value of the counter .
- the first threshold is determined according to a duration corresponding to the second resource in the time domain.
- the processing unit is further configured to determine that the first channel state is idle in the second listening time unit, and continue to decrement the value of the counter from M, the first Two listening time units are after the end time unit of the first resource, and the start time unit of the second resource is the time unit when the value of the counter is decremented to 0.
- the transceiving unit is further configured to receive fourth indication information from the second terminal device, where the fourth indication information is used to indicate the priority of the first data, The first terminal device determines that the priority of the first data is higher than or equal to the priority of the second data.
- the first indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink medium access control control element or radio resource control signaling.
- the third indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink medium access control control element or radio resource control signaling.
- the fourth indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink medium access control control element or radio resource control signaling.
- the fourth aspect is an implementation on the device side corresponding to the first aspect, and the explanations, supplements, and beneficial effects of the first aspect are also applicable to the fourth aspect, and will not be repeated here.
- a communication device in a fifth aspect, includes a transceiver unit and a processing unit, the transceiver unit is used to receive first indication information from a second terminal device, the first indication information is used to indicate a first resource, the first A resource is a resource reserved by the second terminal device for sending the first data, and the processing unit is configured to determine a third resource according to the first resource and the first channel occupancy time, and the third resource belongs to the first resource and the The first channel occupation time, the third resource is used for the second terminal device to send the second data, and the transceiver unit is also used for sending the first data on the fourth resource, and the fourth resource belongs to the first channel occupation time except A resource other than the third resource.
- the transceiving unit is further configured to send second indication information to the second terminal device, where the second indication information is used to indicate the third resource.
- the transceiving unit is specifically configured to send the second indication information to the second terminal device in a first period, and the first period starts at the second
- the starting time unit of the fourth resource is within the range of the starting time unit of the third resource, and the duration between the starting time of the first period and the starting time unit of the fourth resource is greater than or equal to a second threshold.
- the second threshold may be T proc,0 .
- the transceiver unit is further configured to receive third indication information from the second terminal device, where the third indication information is used to indicate that the first terminal device is the second terminal device The destination of the first data sent by the second terminal device.
- the transceiving unit is further configured to receive fourth indication information from the second terminal device, where the fourth indication information is used to indicate the priority of the first data
- the processing unit is further configured to determine that the priority of the first data is higher than or equal to the priority of the second data.
- the transceiver unit receives the first reference signal from the second terminal device, and the processing unit is further configured to determine that the power of the received first reference signal is greater than or equal to the reference Signal received power threshold.
- the first indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink medium access control control element or radio resource control signaling.
- the second indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the first terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the third indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the fourth indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the fifth aspect is an implementation on the device side corresponding to the second aspect, and the explanations, supplements, and beneficial effects of the second aspect are also applicable to the fifth aspect, and will not be repeated here.
- a communication device includes a transceiver unit and a processing unit, the transceiver unit is used to send first indication information, the first indication information is used to indicate a first resource, and the first resource is a second The resource reserved by the terminal device for sending the first data, the transceiver unit is also used to send the first data on the third resource, the third resource is determined according to the first resource and the first channel occupancy time, the second The three resources belong to the first resource and the first channel occupancy time, and the start time unit of the first occupied channel is before the start time unit of the first resource.
- the transceiving unit is configured to receive second indication information from the first terminal device, where the second indication information is used to indicate the third resource.
- the transceiving unit is specifically configured to receive the second indication information from the first terminal device in a first period, and the first period starts at the fourth
- the start time unit of the resource is within the range of the start time unit of the third resource, and the duration between the start time of the first period and the start time unit of the fourth resource is greater than or equal to a second threshold.
- the second threshold may be T proc,0 .
- the transceiver unit is further configured to send third indication information, where the third indication information is used to instruct the first terminal device to send the first destination of the data.
- the transceiving unit is further configured to send the first reference signal.
- the first indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the second indication information is carried in the first-level sidelink control information, second-level sidelink control information, At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the third indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the second-level sidelink control information from the second terminal device. At least one of sidelink media access control control element or PC5 radio resource control signaling.
- the fourth indication information is carried in the first-level sidelink control information and the sidelink medium access control control element from the second terminal device Or radio resource control signaling.
- the sixth aspect is an implementation on the device side corresponding to the third aspect, and the explanations, supplements, and beneficial effects of the third aspect are also applicable to the sixth aspect, and will not be repeated here.
- a computer-readable medium stores program code for execution by a communication device, the program code includes a program code for implementing the first aspect or the second aspect or the third aspect, the first aspect or Any possible implementation manner of the second aspect or the third aspect, or instructions for the communication method in the method of the first aspect or all possible implementation manners of the second aspect or the third aspect.
- a computer program product comprising instructions, which, when run on a computer, cause the calculation
- the machine executes the above first aspect or the second aspect or the third aspect, or any possible implementation of the first aspect or the second aspect or the third aspect, or, in the first aspect or the second aspect or the third aspect All possible methods of implementation.
- a communication system includes a method for realizing the first aspect, the second aspect, or the third aspect, or any possible implementation of the first aspect, the second aspect, or the third aspect , or, all possible implementation methods and various possible designed functional devices in the first aspect or the second aspect or the third aspect.
- a processor configured to be coupled with a memory, and configured to execute the first aspect, the second aspect, or the third aspect, or any one of the first aspect, the second aspect, or the third aspect may be or, the method in all possible implementations of the first aspect or the second aspect or the third aspect.
- a chip in an eleventh aspect, includes a processor and a communication interface, the communication interface is used to communicate with external devices or internal devices, and the processor is used to implement the first aspect or the second aspect or the third aspect , or, any possible implementation manner of the first aspect, the second aspect, or the third aspect, or, a method in all possible implementation manners of the first aspect, the second aspect, or the third aspect.
- the chip may further include a memory, the memory stores instructions, and the processor is used to execute the instructions stored in the memory or other instructions.
- the processor is used to implement the method in the above first aspect or the second aspect or the third aspect or any possible implementation manners thereof.
- the chip can be integrated on terminal equipment and/or network equipment.
- FIG. 1 shows a system architecture to which this embodiment of the present application is applicable.
- Fig. 2 shows a time slot to which this embodiment of the present application is applicable.
- Fig. 3 shows a listening-before-speaking process applicable to the embodiment of the present application.
- Fig. 4 shows another listen-before-speak process applicable to the embodiment of the present application.
- FIG. 5 shows a schematic diagram of a communication method proposed by an embodiment of the present application.
- FIG. 6 shows a schematic diagram of a transmission resource proposed by the embodiment of the present application.
- FIG. 7 shows a schematic flow chart of a communication method proposed by an embodiment of the present application.
- FIG. 8 shows a schematic diagram of another communication method proposed by the embodiment of the present application.
- FIG. 9 shows a schematic flowchart of another communication method proposed by the embodiment of the present application.
- FIG. 10 shows a schematic diagram of another transmission resource proposed by the embodiment of the present application.
- FIG. 11 shows a schematic flowchart of another communication method proposed by the embodiment of the present application.
- FIG. 12 shows a schematic diagram of another transmission resource proposed by the embodiment of the present application.
- FIG. 13 shows a schematic block diagram of a communication device proposed by an embodiment of the present application.
- Fig. 14 shows a schematic block diagram of another communication device proposed by the embodiment of the present application.
- the technical solutions of the embodiments of the present application can be applied to various communication systems, such as 5G (fifth generation (5th generation, 5G) or new radio (new radio, NR) system, long term evolution (long term evolution, LTE) system, LTE Frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, etc.
- 5G farth generation
- NR new radio
- LTE long term evolution
- LTE Frequency division duplex frequency division duplex
- FDD frequency division duplex
- TDD time division duplex
- D2D device-to-device
- V2X vehicle-to-everything
- M2M machine-to-machine
- MTC machine type communication
- IoT Internet of Things
- the technical solution provided by the embodiment of the present application can be applied to a link between a network device and a terminal device, and can also be applied to a link between devices, such as a device to device (device to device, D2D) link.
- the D2D link may also be called a side link, where the side link may also be called a side link or a secondary link.
- a D2D link, or a side link or a secondary link all refer to links established between devices of the same type, and have the same meaning.
- the so-called devices of the same type may be a link between terminal devices, a link between network devices, or a link between relay nodes, etc. This embodiment of the present application does not limit it.
- V2X specifically includes vehicle-to-vehicle (V2V), vehicle-to-roadside infrastructure (vehicle-to-infrastructure, V2I), and vehicle-to-pedestrian (V2P) direct communication. Communication, and vehicle-to-network (V2N) or vehicle-to-any entity V2X links, including Rel-14/15.
- V2V vehicle-to-vehicle
- V2I vehicle-to-roadside infrastructure
- V2P vehicle-to-pedestrian
- V2X also includes Rel-16 and subsequent versions of V2X links based on NR systems currently being studied by 3GPP.
- V2V refers to communication between vehicles;
- V2P refers to communication between vehicles and people (including pedestrians, cyclists, drivers, or passengers);
- V2I refers to communication between vehicles and infrastructure, such as roadside units (road side unit, RSU) or network equipment, and there is another V2N that can be included in V2I.
- V2N refers to the communication between vehicles and network equipment.
- RSU includes two types: terminal type RSU, because it is placed on the roadside, the terminal type RSU is in a non-mobile state, and there is no need to consider mobility; base station type RSU can provide timing synchronization for vehicles communicating with it and resource scheduling.
- FIG. 1 is a schematic structural diagram of a communication system 1000 applied in an embodiment of the present application.
- the communication system includes a radio access network 100 , and optionally, the communication system 1000 may further include a core network 200 and the Internet 300 .
- the radio access network 100 may include at least one radio access network device (such as 110a and 110b in FIG. 1 ), and may also include at least one terminal (such as 120a-120j in FIG. 1 ).
- the terminal is connected to the wireless access network device in a wireless manner, and the wireless access network device is connected to the core network in a wireless or wired manner.
- the core network equipment and the wireless access network equipment can be independent and different physical equipment, or the functions of the core network equipment and the logical functions of the wireless access network equipment can be integrated on the same physical equipment, or it can be a physical equipment It integrates some functions of core network equipment and some functions of radio access network equipment. Terminals and wireless access network devices may be connected to each other in a wired or wireless manner.
- FIG. 1 is only a schematic diagram.
- the communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG. 1 .
- the information sending end in the communication system of the present application may be a network device or a terminal device
- the information receiving end may be a network device or a terminal device, which is not limited in this application.
- UE may be referred to as a terminal device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user. device.
- a terminal device can be a device that provides voice/data to the user, for example, a handheld type equipment, vehicle equipment, etc.
- a terminal device may include user equipment, sometimes referred to as a terminal, an access station, a UE station, a remote station, a wireless communication device, or a user device, among others.
- the terminal device is used to connect people, objects, machines, etc., and can be widely used in various scenarios, including but not limited to the following scenarios: cellular communication, D2D, V2X, machine-to-machine/machine-type communication (machine-to-machine /machine-type communications, M2M/MTC), Internet of things (Internet of things, IoT), virtual reality (virtual reality, VR), augmented reality (augmented reality, AR), industrial control (industrial control), unmanned driving ( self driving), remote medical, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, drones, robots and other scenarios.
- cellular communication D2D, V2X
- machine-to-machine/machine-type communication machine-to-machine /machine-type communications
- M2M/MTC machine-to-machine/machine-type communications
- Internet of things Internet of things, IoT
- virtual reality virtual reality
- AR augmented reality
- industrial control industrial control
- unmanned driving self driving
- the terminal device may be a mobile phone, a tablet computer (Pad), a computer with a wireless transceiver function, a VR terminal, an AR terminal, a wireless terminal in industrial control, a vehicle, or a wireless communication module in a vehicle , vehicle T-box (Telematics BOX), roadside unit RSU, wireless terminal in unmanned driving, smart speaker in IoT network, wireless terminal equipment in telemedicine, wireless terminal equipment in smart grid, wireless terminal equipment in transportation safety
- the terminal device, the wireless terminal device in the smart city, or the wireless terminal device in the smart home, etc. are not limited in this embodiment of the present application.
- the terminal device may also be a wearable device.
- Wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
- a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction.
- Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign detection.
- the terminal device can also be the terminal device in the IoT system. IoT is an important part of the development of information technology in the future. Its main technical feature is to connect items to the network through communication technology, so as to realize Interconnection, an intelligent network that interconnects things.
- Vehicle-mounted terminal devices are also called on-board units (OBU), for example.
- OBU on-board units
- the terminal device of the present application can also be a vehicle-mounted module, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit built into the vehicle as one or more components or units.
- the on-board components, on-board chips, or on-board units can implement the method of the present application.
- a network device in the wireless communication system may be a device capable of communicating with a terminal device, and the network device may also be called an access network device or a wireless access network device, for example, the network device may be a base station.
- the network device in this embodiment of the present application may refer to a radio access network (radio access network, RAN) node (or device) that connects a terminal device to a wireless network.
- radio access network radio access network, RAN node (or device) that connects a terminal device to a wireless network.
- the base station can broadly cover various names in the following, or replace with the following names, such as: Node B (NodeB), evolved base station (evolved NodeB, eNB), next generation base station (next generation NodeB, gNB), relay station, Access point, transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), master station (master eNodeB, MeNB), secondary station (secondary eNodeB, SeNB), multi-standard wireless (multi standard radio, MSR) node, home base station, network controller, access node, wireless node, access point (access point, AP), transmission node, transceiver node, base band unit (base band unit, BBU), remote radio unit (remote radio unit, RRU), active antenna unit (active antenna unit, AAU), radio head (remote radio head, RRH), central unit (central unit, CU), distributed unit (distributed unit, DU), positioning nodes, etc.
- NodeB Node B
- a base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof.
- a base station may also refer to a communication module, modem or chip used to be set in the aforementioned equipment or device.
- the base station can also be a mobile switching center, a device that assumes the function of a base station in D2D, V2X, and M2M communications, a network-side device in a 6G network, and a device that assumes the function of a base station in a future communication system.
- Base stations can support networks of the same or different access technologies. The embodiment of the present application does not limit the specific technology and specific device form adopted by the network device.
- the functions of the base station may also be performed by modules (such as chips) in the base station, or may be performed by a control subsystem including the functions of the base station.
- the control subsystem including base station functions here may be the control center in the above application scenarios such as smart grid, industrial control, intelligent transportation, and smart city.
- the functions of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or may be performed by a device including the terminal function.
- the communication interface (Uu interface) between user equipment and network equipment can be called Uu interface
- the communication interface (PC5 interface) between user equipment and user equipment can be called PC5 interface
- the transmission link in PC5 interface It is defined as a sidelink (sidelink, SL).
- Unlicensed frequency band In the wireless communication system, according to the different frequency bands used, it can be divided into licensed frequency bands and unlicensed frequency bands. In the licensed frequency band, users use spectrum resources based on the scheduling of the central node. In an unlicensed frequency band, transmitting nodes need to use spectrum resources in a competitive manner, specifically, compete for channels in a listen-before-talk (LBT) manner.
- LBT listen-before-talk
- the NR protocol technology in the unlicensed frequency band is collectively referred to as NR-U, and it is expected to further improve the communication performance of the corresponding Uu interface through NR-U.
- SL-U Enabling SL communication in unlicensed frequency bands in the local space is an important evolution direction, and the corresponding protocol technologies can be collectively referred to as SL-U. Similar to the Uu interface, UEs working through SL-U also need to coexist with nearby Wi-Fi devices based on the LBT mechanism. The reason why the LBT mechanism has become a mandatory feature of the unlicensed frequency band is that there are regulatory requirements for the use of the unlicensed frequency band in various regions of the world. UEs of various forms working on different communication protocols can only use unlicensed frequency bands if they meet the regulations, so as to use spectrum resources relatively fairly and efficiently.
- Time domain resource In the time domain of the SL resource pool, it includes one or more time units, and the time unit can be one or several symbols, one or several time slots, or one or several mini-slots (mini-slot), one or several subframes, or one or several frames, etc.
- One or more time units can be continuous in time or discrete. It should be understood that the time domain units in a resource pool are logically continuous.
- the understanding of a definition of symbols, mini-slots, time slots, subframes and frames can refer to 3GPP TS 38.211.
- time slot 1 to time slot 8 are continuous time slots in time, and such time slots are called physical time slots (physical slot).
- Physical slot Physical slot
- the continuous time slots (ie, time slot 1', time slot 2', time slot 3' and time slot 4') contained in the resource pool are logically continuous time slots from the resource pool, which are called logically
- the time slots that are continuous but not necessarily continuous in time are called logical slots.
- Start time unit the first time unit of a resource in the time domain.
- End time unit the last time unit of a resource in the time domain.
- the resource shown in Figure 2 includes time slot 1-time slot 8 in the time domain, then time slot 1 is the starting time unit of the resource, and time slot 8 is the end of the resource unit of time.
- Frequency domain resource In the frequency domain of the SL resource pool, it includes one or more frequency domain units.
- the frequency domain unit can be a resource element (resource element, RE) or several REs, or a resource block (resource block, RB) or several RBs, or one sub-channel (sub channel) or several sub-channels.
- the size of a subchannel indicates that a subchannel includes one or more continuous or interlaced RB numbers in the frequency domain, which can be integers such as 10, 12, 15, 20, 25 or 50 .
- NR SL supports two resource allocation modes, namely mode 1 and mode 2.
- Mode 1 (SL mode 1): The resources used for sidelink transmission are allocated by the network equipment. Mode 1 is usually used for sidelink communication within the coverage of the network equipment.
- SL mode 2 UE autonomously selects the resources used for sidelink transmission.
- a way of autonomously selecting resources the UE at the sending end selects transmission resources for communication within the resource selection window by itself according to the result of the interception within its own interception window. Assuming that the UE at the sending end triggers resource selection in time slot n, the specific resource selection process is as follows:
- Step 1 Determine the resource selection window [n+T 1 ,n+T 2 ], 0 ⁇ T 1 ⁇ T (proc,1) SL , T 2min ⁇ T 2 ⁇ PDB (delay of data packet), T 1 and
- the choice of T2 is based on implementation.
- Step 2 Determine the listening window [nT 0 ,nT (proc,0) SL )].
- Step 3 Determine the reference signal received power (reference signal received power, RSRP) threshold value, the RSRP threshold value and the priority prio TX of the data to be transmitted, and the received sidelink control information (sidelink control information , SCI) is related to the priority prio RX indicated, specifically the prio RX + (prio TX -1)*8th threshold in the RSRP threshold set configured in the resource pool.
- RSRP reference signal received power
- SCI sidelink control information
- Step 4 Initialize the available resource set SA including all time-frequency resources in the resource selection window (in units of one time slot and one subchannel).
- Step 5 Excluding the following time-frequency resources from SA : time slots reserved by all periodic resources configured in the resource pool corresponding to unlistened time slots (sent time slots) in the listening window.
- time-frequency resources excluded by SA are less than X% of the total resources in the resource selection window, re-execute the initialization in step 4.
- Step 6 Continue to exclude the following time-frequency resources from SA : the received first-level SCI is decoded successfully, and the physical sidelink shared channel (physical sidelink shared channel) corresponding to the time-frequency resource reserved by the received first-level SCI channel (referred to as PSSCH) on the demodulation reference signal (demodulation reference signal, DMRS) on the RSRP measurement result is higher than step 3 to determine the RSRP threshold, and the time-frequency resource reserved by the received first-level SCI is within the resource selection window of.
- PSSCH physical sidelink shared channel
- DMRS demodulation reference signal
- Step 7 If the remaining resources in S A are less than X% of the total resources in the resource selection window, and the value of X% is configured by the resource pool, then by raising the RSRP threshold determined in step 3 (for example, each time raising 3 ), until the remaining resources in the SA are not less than X% of the total resources in the resource selection window.
- time-frequency resources (r 0 , r 1 , r 2 ,%) are randomly selected for sending data, and resource re-evaluation is performed on (r 0 , r 1 , r 2 ,%) before sending, After re-evaluation, selected resources (r 0 ', r 1 ', r 2 ', ...) from SA are preempted.
- the resources (r 0 ', r 1 ', r 2 ', ...) are logical time slots.
- the UE can trigger resource re-evaluation and/or preemption detection before and after time slot mT 3 based on the implementation.
- time slot m is the next time slot to be sent A time slot, ie slot m belongs to (r 0 , r 1 , r 2 ,...) and (r 0 ′, r 1 ′, r 2 ′ ,).
- Channel busy ratio (channel busy ratio, CBR): Indicates that within the preset measurement period (such as 100 time slots or 100 ⁇ 2 ⁇ time slots), the sidelink-received signal strength indicator (sidelink-received signal The ratio of the number of channels whose strength indicator, S-RSSI) exceeds the pre-configured threshold to the total number of channels.
- CBR is an index to measure the degree of interference. The larger the CBR, the higher the busyness of the channel, the greater the system load, and the stronger the interference between different terminal devices.
- the S-RSSI of a certain channel is greater than the preconfigured critical value, it indicates that the channel is occupied; if the S-RSSI of a certain channel is less than or equal to the preconfigured critical value, it indicates that the channel is not occupied.
- the CBR measurement methods are different, and the obtained CBR can represent the busyness of different types of channels.
- the terminal device performs a physical sidelink feedback channel (physical sidelink feedback channel, PSFCH), PSSCH and physical sidelink control channel (physical sidelink control channel, PSCCH) CBR measurement is performed on three channels, and the obtained CBR indicates the overall channel busyness of PSFCH, PSSCH and PSCCH within the preset measurement period. If the terminal device performs CBR measurement on the PSFCH, the obtained CBR at this time indicates the busyness of one channel of the PSFCH within a preset measurement period.
- PSFCH physical sidelink feedback channel
- PSSCH physical sidelink control channel
- PSCCH physical sidelink control channel
- the terminal device performs CBR measurement on the two channels of PSSCH and PSCCH
- the CBR obtained at this time indicates the overall channel busyness of PSSCH and PSCCH within the preset measurement period.
- the detailed process of "the terminal device performs CBR measurement on different channels to obtain the CBR" can refer to related technologies, and will not be repeated here.
- ⁇ represents the serial number of the subcarrier interval.
- LBT The LBT mechanism is a channel access rule. UE needs to monitor whether the channel is idle before accessing the channel (starting to send data). If the channel has been idle for a certain period of time, the UE can occupy the channel; if the channel is not idle, the UE needs to wait for the channel to become idle again. to occupy the channel.
- energy-based detection and signal type detection can be used to judge the status of the channel.
- NR-U uses energy detection
- WiFi uses a combination of two detection methods.
- Energy-based detection needs to set a detection threshold (energy detection threshold). When the detected energy exceeds the detection threshold, it is judged that the channel is busy, and access to the channel is not allowed. When the detected energy is lower than the detection threshold, if it lasts for a period of time, access to the channel is allowed.
- OCB minimum occupied channel bandwidth
- the minimum OCB It must be at least 80% of the normal bandwidth, taking the normal bandwidth of 20MHz as an example, that is, the UE needs to occupy at least 16MHz of bandwidth to preempt the 20MHz channel.
- the first type of LBT the communication device needs to perform a random backoff (backoff) before it can access a channel and send data.
- the user equipment may detect that the channel is idle for the first time in a defer sensing time (denoted as T d ), and after decrementing the counter N to zero in the sensing slot duration (sensing slot duration), initiate data transmission.
- T d defer sensing time
- sensing slot duration m p consecutive listening slot periods
- Step 3 If the channel during the listening slot is idle, go to Step 4;
- Step 5 Listen to the channel until the channel is detected to be busy in another Td or all the listening time slots in another Td are detected as channel idle;
- Step 6 If the listening time slots in another T d are all detected as channel idle, then perform step 4;
- CW min,p ⁇ CW p ⁇ CW max,p
- CW min,p is the minimum value of the contention window when the priority is p
- CW max,p is the maximum value of the contention window when the priority is p .
- CW min,p and CW max,p are selected prior to step 1 above, m p , CW min,p and CW max,p are determined based on the channel access priority level p associated with network device or terminal device transmissions, As shown in Table 1:
- T m cot,p is the maximum channel occupancy time (maximum channel occupancy time for a given priority class) when the priority is p, and the channel occupancy time (channel occupancy time, COT ) does not exceed T m cot,p .
- COT refers to the time allowed for the communication device to occupy the channel after successfully accessing the channel.
- the communication device can seize the right to use the channel for a period of time after completing the LBT process.
- the channel access process is performed based on the channel access priority level p associated with the transmission of network equipment or terminal equipment. The smaller the value of the priority level in Table 1, the higher the priority. For example, priority 1 is the highest priority class.
- the network device or terminal device maintains the contention window value CW p , and adjusts the value of CW p according to the following steps before step 1:
- hybrid automatic repeat request acknowledgment hybrid automatic repeat request acknowledgment
- HARQ-ACK hybrid automatic repeat request acknowledgment
- NACK negative acknowledgment
- the user equipment determines through listening that the channel is always in an idle state within the duration of the first T d , and in the first T sl N is decremented from 6 to 5, and N is decremented from 5 to 4 in the second T sl , the user equipment detects that the channel status is busy, waits for the channel status to be idle and lasts for T d , and then in the third T sl Decrements N to 3 in sl .
- the user equipment detects that the channel is busy again, waits for the channel state to be idle again and lasts for T d , then decrements N to 2 in the fourth T sl , and decrements N to 1 in the fifth T sl , and then decrements N to 1 in the fifth T sl. Decrement N to 0 in six T sl .
- the user equipment accesses the channel and transmits data in the COT.
- the second type of LBT is LBT without random backoff, which can be divided into two cases:
- Case B Send immediately after a short switching gap.
- the communication device sends immediately after the switching gap from the receiving state to the sending state in the COT, and the switching gap is not greater than 16us.
- the UE monitors the channel and determines that the channel is idle within a time interval (gap), and can access the channel at the end of the time interval.
- a time interval (gap)
- the time domain resources used by the UE to perform the LBT process include one or more listening time units, for example, one listening time unit is 9us.
- the UE can listen to the channel and perform random backoff at the same time.
- the length of the listening time unit is different from the time unit length of the time domain resource used by the UE to send data. For example, taking a time slot as an example of a time unit included in the time domain resource used by the UE to send data, the length of the time unit may be: when the subcarrier spacing is 15kHZ, the time unit length is 1ms; when the subcarrier spacing is At 30kHZ, the time unit length is 0.5ms, etc.
- UEs that urgently need to send data may not be able to compete for transmission resources.
- the data priority of UE1 is higher, but transmission resources may be preempted by other UEs.
- the random backoff process of UE1 has not been completed, but the random backoff process of other UEs is completed before UE1, so that other UEs can access the channel first. In this case, UE1 can no longer access the channel. It can wait for the data transmission of other UEs to end and then try to access the channel again based on LBT.
- the embodiment of the present application proposes a communication method, which can enable timely data transmission to meet service requirements.
- the method may include the following steps:
- Step 501 the first terminal device receives first indication information from the second terminal device.
- the first indication information is used to indicate a first resource, and the first resource is a resource reserved by the second terminal device for sending the first data.
- the first resource corresponds to the first COT in the time domain.
- the first resource may also be referred to as a resource reserved by the second terminal device, or a reserved COT.
- the first indication information may be carried in the first-level sidelink control information SCI, or the second-level SCI, or the sidelink media access control control element (sidelink media access control control element, SL-MAC CE), Or, at least one of PC5 interface radio resource control (PC5 radio resource control, PC5-RRC) signaling.
- the first indication information may be carried in only one of the above signalings.
- the first indication information may also be carried in multiple of the above signalings, for example, the complete content of the first indication information may be carried in the SL-MAC CE, also carried in the PC5-RRC and so on.
- the content of the first indication information may be jointly indicated through multiple signalings. For example, part of the content of the first indication information is carried in the first-level SCI, and another part of the content is carried in the PC5-RRC, etc., this The embodiment of the application does not limit this.
- the first indication information may also be carried in signaling configured by other networks, or in preconfigured signaling.
- a periodic resource reservation indication (resource reservation period) field is used to indicate a resource that is periodically reserved for data transmission, and the value of the periodic resource reservation indication field may be configured by the network device, or pre-configured, or predefined.
- the network device may indicate periodic resources through RRC signaling, and the RRC signaling includes periodic information (sl-ResourceReservePeriod1). This embodiment of the present application does not limit it.
- the frequency domain resource indication (frequency resource assignment) field and the time domain resource indication (time resource assignment) field in the first-level SCI are respectively used to indicate that the first user equipment transmits Frequency domain resources and time domain resources of data.
- the second terminal device may determine the first resource.
- the first indication information may indicate the LBT time-frequency start position of the second terminal device, where the LBT time-frequency start position can be understood as the start position of the time-frequency resource used by the second terminal device to perform LBT; or, the first The indication information may indicate the time-frequency starting position of the COT reserved by the second terminal device.
- the second terminal device When the first indication information is used to indicate the LBT time-frequency starting position of the second terminal device, the second terminal device also needs to indicate the LBT parameter to the first terminal device, and the first terminal device determines the first resource according to the LBT parameter.
- the LBT parameter is the LBT parameter of the second terminal device.
- the LBT parameter of the second terminal device may include an LBT counter, such as the total backoff times N init and the value N of the current counter, and the LBT parameter may also include the LBT channel access priority p.
- the LBT parameter can be carried by the second-level SCI, for example, it can be carried by SCI format 2-D.
- the format of the second-level SCI can be indicated by the first-level SCI, and the possible format fields of the second-level SCI are shown in Table 2:
- Table 2 is only used as an example rather than limitation. Table 2 may be implemented with part of its content, or may be implemented with its entire content, or Table 2 may be implemented as a part of other content, which is not limited in this embodiment of the present application.
- the second terminal device may send indication information (that is, third indication information) to the first terminal device, where the indication information is used to instruct the first terminal device to be the destination of the data sent by the second terminal device.
- the indication information may include the identity document (identity document, ID) of the source end and the destination end of the data to be sent, wherein, the ID (source ID) of the source end is the ID of the second terminal device, and the ID (destination ID) of the destination end is the ID of the first terminal device.
- the indication information may include the ID of the second terminal device.
- the indication information may include the ID of the second terminal device and the ID of the first terminal device.
- the indication information may include a temporary user group ID (temporary UE group ID, hereinafter referred to as group ID), which is a group predefined by the network device.
- group ID temporary UE group ID
- the network device divides UE1 and UE2 into the same group.
- the indication information may include a cell ID, and the cell may be a geographically defined cell where UE1 and UE2 co-exist, the cell may be a cell divided according to the scheduling scope of the network device, or the cell may be a cell predefined by the network device. district.
- the first terminal device also needs to receive indication information of the same content from the network device.
- the first terminal device receives the group ID from the network device, and then receives the same group ID from the second terminal device, so that it can determine that it and the second terminal device are in the same group ID, and the network device can predefine the temporary group to include If the ID is the ID of the dual data transmission, the first terminal device can determine itself and the second terminal device as the two parties of the data transmission.
- the network device may pre-configure the corresponding relationship between the first terminal device and the second terminal device.
- the network device may pre-configure the correspondence table between the potential interactive peers of the first terminal device and the first terminal device in the first terminal device, and when the first terminal device receives the ID sent by the second terminal device , it can be determined that the second terminal device is the peer terminal interacting with itself.
- the above-mentioned third indication information may be carried in at least one of the first-level SCI, or the second-level SCI, or SL-MAC CE, or PC5-RRC signaling. It should be understood that the above manner of indicating both parties of data transmission is only an example rather than a limitation. For the bearing manner of the third indication information, reference may be made to relevant descriptions of the first indication information, and details are not repeated here.
- the second terminal device also sends data priority indication information (ie, fourth indication information) to the first terminal device, which is used to indicate the priority of the data to be sent by the second terminal device.
- the priority indication information may be carried in at least one of the first-level SCI, or the second-level SCI, or SL-MAC CE, or PC5-RRC signaling.
- fourth indication information For the bearing manner of the fourth indication information, reference may be made to relevant descriptions of the first indication information, and details are not repeated here.
- first indication information and fourth indication information may be sent in a broadcast form, a multicast form, or a unicast form. This embodiment of the present application does not limit it.
- Step 502 The first terminal device determines the second resource according to the first indication information.
- the first terminal device may determine the second resource according to the first resource indicated by the first indication information. Exemplarily, the first terminal device determines the second resource according to the position of the first resource in the time domain. Specifically, the first terminal device determines a part of resources, and if the resource is behind the position of the first resource in the time domain in the time domain and does not overlap with the first resource, then the part of resources may be the second resource.
- the first terminal device may also detect that the first channel state is idle in the first listening time unit, and stop the listen-before-talk process in the first listening time unit according to the first resource.
- the first listening time unit is before the start time unit of the first resource.
- the first terminal device suspends the listen-before-talk process in the first listening time unit according to the first resource. It can be understood that, after the first terminal device determines the first resource, the first terminal device The listen-time unit aborts the listen-before-speak process.
- the first terminal device when the first terminal device receives the LBT time-frequency starting position and LBT parameter information, the first terminal device needs to determine the time-frequency position of the first resource according to the LBT time-frequency starting position and the LBT parameter information. For example, the first terminal device calculates the time required for the counter in the second terminal device to decrement from N to 0 according to the total LBT rollback times N init and the value N of the current counter, and then according to the LBT time-frequency start position and the value N
- the time-frequency position at the end of the LBT can be determined by the duration, and the time-frequency position at the end of the LBT is the start position (start time unit) of the first resource.
- the first terminal device suspends the process of listening before talking, which can be understood as the process in which the first terminal device stops or temporarily stops accessing the channel. In other words, the first terminal device does not access the channel within the time domain corresponding to the first resource. , or, it may be that the first terminal device stops decrementing the value of the counter, for example, after decrementing the value of the counter from Q to M, stop decrementing, where 1 ⁇ M ⁇ Q, Q is the initial value of the counter.
- the first terminal device Before the first terminal device terminates the listen-before-talk process, it also needs to determine at least one of the following:
- the priority of the data to be sent by the second terminal device is higher than the priority of the data to be sent by the first terminal device.
- the first terminal device may determine a priority relationship according to the fourth indication information in step 501 and its own data priority.
- the RSRP of the reference signal sent by the second terminal device is higher than the RSRP threshold determined by the first terminal device.
- the first terminal device seizes the channel, it will silence UEs within a certain RSRP threshold range according to the strength of its transmitted signal, and these UEs will not be able to complete the LBT fallback process because they detect that the channel is busy. If the RSRP of a certain UE is low, it means that the distance between the UE and the first terminal device is relatively long. After the first terminal device shares resources with the second terminal device, the second terminal device's lower RSRP cannot silence other devices near the first terminal device, resulting in the possibility that the channel is occupied by other devices. Therefore, when the RSRP of the reference signal sent by the second terminal device is higher than the RSRP threshold determined by the first terminal device, data can be sent normally.
- the second terminal device may send a reference signal to the first terminal device.
- the reference signal may be carried in the first-level SCI, for example, the reference signal may be a PSCCH DMRS.
- the reference signal may also be a reference signal of PSSCH, such as PSSCH DMRS.
- the first terminal device obtains the received power of the reference signal by measuring the first-level SCI.
- the determination of the RSRP threshold can refer to the relevant instructions in SL mode 2, and will not be repeated here.
- the start time unit of the first resource is after the start time unit of the resource to be seized by the first terminal device.
- the resource to be seized by the first terminal device may be understood as the time-frequency resource that the first terminal device will occupy after backoff is completed according to the current LBT process. As shown in (a) of FIG. 6 , the resource to be seized by the first terminal device is the time-frequency resource between T UE1S and T UE1E .
- the duration between the start time unit of the first resource and the first listening time unit whose counter value is M is less than or equal to the first threshold, where 1 ⁇ M ⁇ N, N is the counter when the abort counter is decremented value of .
- the first threshold may be greater than 0, and at the same time less than the time delay required by the first terminal device to send data.
- the moment when the first terminal device determines to suspend execution may be any moment when the value of the counter when the upper limit is met is greater than 0.
- the first threshold may be a value configured by the network device, or a pre-configured value, or a fixed value predefined by a standard protocol, which is not limited in this embodiment of the present application.
- the first terminal device suspends the decrementing counter, which can be understood as the first terminal device no longer decrements the counter from a certain moment, and the value of the counter maintains the value before the suspension and does not change. Moreover, the minimum value of the limited counter is maintained at 1, which means that the first terminal device will not be able to access the channel to send data according to the LBT rule.
- the first listening time unit whose value of the counter is M refers to the listening time unit at the moment when the interruption starts (that is, the first listening time unit). For example, the decrement is stopped at listening time unit 1, and the value of the counter is 2 at this time. Before the start unit of the first resource, listening time unit 2 and listening time unit 3 are also included. In listening time unit 2 and the value of the counter in listening time unit 3 is always 2, then the first listening time unit whose counter value is 2 is listening time unit 1. It should be understood that the above numerical values and indexes are only examples and not limitations.
- the first terminal device also needs to successfully decode the first level SCI.
- the first terminal device may also determine, according to the third indication information, that the second terminal device is the destination to which the first terminal device sends information (data).
- the first terminal device may also determine the CBR of the first channel.
- the first terminal device may abort the LBT process.
- CBR indicates the busyness of the first channel within the first preset time period.
- the first preset duration may be a preset measurement period, such as 100 time slots, or 100 T sl , Or 100 T d (or 100*2 ⁇ time slots/T sl /T d ).
- the first terminal device may determine that the energy detection result is greater than the energy detection threshold T sl ( The ratio of the number of T d ) to the total number of T sl (T d ), the energy detection threshold may be X Thresh . If the energy detection result of a certain channel or T sl (T d ) is greater than the energy detection threshold, it indicates that the channel or T sl (T d ) has been occupied; if the energy detection result of a certain channel is less than or equal to the energy detection threshold, then Indicates that the channel or T sl (T d ) is not occupied. When the ratio is less than or equal to the third threshold, the first terminal device may terminate the LBT process.
- the above-mentioned third threshold may be predefined.
- the third threshold may be 20%. This embodiment of the present application does not limit it. It should be understood that, in the time domain, the first preset duration or the preset measurement period is before the time slot at which the first terminal device terminates the LBT.
- the first terminal device may also perform re-evaluation or preemption detection on resources. For example, after the listening window, the first terminal device may perform re-evaluation or preemption detection on time domain resources before the second terminal device accesses the channel. For example, the first terminal device determines that ri and /or ri ' in (r 0 , r 1 , r 2 ,...) and (r 0 ', r 1 ', r 2 ',...) do not belong to S A (that is, ri and ri ' are respectively excluded during re-evaluation and/or preemption detection), then it can be determined that ri and/or ri ' can be used for the second terminal device to send data.
- the first terminal device can determine the listening window, selection window, reference signal received power threshold, and initialize available resource set. For details, refer to the description of steps 1-4 in SL mode 2 ,No longer.
- the above-mentioned channels can be understood as bandwidth.
- there are multiple access channels with a bandwidth of 20MHz and the UE can perform LBT access in each 20MHz channel, and the access process of each channel is mutually Independently, the UE occupies the corresponding 20MHz bandwidth after completing the LBT.
- 20 MHz is only an example of the channel in the embodiment of the present application and is not limiting.
- the channel in the embodiment of the present application may also have other bandwidths such as 30 MHz, 40 MHz, or 45 MHz.
- Step 503 the first terminal device sends data on the second resource.
- the start time unit of the second resource is after the end time unit of the first resource.
- T* UE1S follows T UE2E . That is to say, the first terminal device waits for the second terminal device to finish sending data before accessing the channel to send data. It can be understood that the first terminal device delays (defer) channel access, or avoids resources reserved by the second terminal device.
- the first threshold in step 502 may be determined according to the duration of the second resource.
- the first threshold may be 1/10, or 1/8, or the like of the duration of the second resource.
- a possible implementation of the first terminal device accessing the second resource the first terminal device determines that the channel state is idle in the second listening time unit, and continues to decrement the counter, and the second listening time unit is at the end time of the first resource After the unit, the first terminal device decrements the counter to 0 at the start time unit of the second resource, and accesses the channel to send data.
- the counter refers to the value of the counter when the decrement starts this time, and the value of the counter when the decrement stops in step 502 .
- the value of the counter is 2 when the decrement is terminated in step 502, and this time the value of the counter is decremented from 2 to 0. It should be understood that this value is only an example rather than a limitation. According to the LBT rule, decrementing the counter to 0 means that the first terminal accesses the channel to send data.
- the first terminal device may determine that the channel is idle within a period of time, and the first terminal device accesses the channel, and the duration of the period may be 16us.
- the duration of the period may be 16us.
- the first terminal device can also listen at the start time unit of the first resource to determine whether the second terminal device successfully accesses the channel. If the second terminal device successfully accesses the channel, the first terminal device follows step 503 otherwise, the first terminal device directly continues the LBT process, and accesses the channel after the LBT is completed.
- sending data by the first terminal device on the first channel may be understood as an example of sidelink transmission by the first terminal device on the first channel.
- the first terminal device may also send or receive sidelink control information and/or feedback information, etc. on the first channel.
- devices that may preempt resources are avoided in the time domain, so that devices with higher data priority can send data in time on reserved resources, which meets business requirements and significantly improves user experience.
- the embodiment of the present application proposes a communication method, as shown in FIG. 7 , taking the first indication information and the fourth indication information carried on the first-level SCI as an example, taking UE1 as an example of the first terminal device, and UE2 as the second
- COT1 is used as an example of the first resource
- COT2 is used as an example of the second resource
- SCI#A is used as an example of the first-level SCI
- SCI#B is used as the second-level SCI
- the method may include the steps of:
- Step 701 UE2 sends SCI#A to UE1, and UE1 receives SCI#A accordingly.
- SCI#A is carried on the PSCCH.
- SCI#A includes resource indication information, data priority information, reference signal and the format of SCI#B. Specifically, reference may be made to related descriptions about the first indication information and the fourth indication information in step 501, and details are not repeated here.
- Step 702 UE2 sends SCI#B to UE1, and UE1 receives SCI#B accordingly.
- SCI#B is carried on PSSCH.
- SCI#B includes the LBT parameters of UE2.
- Step 703 UE1 determines COT1 according to SCI#A and SCI#B.
- Step 704 UE1 judges that the avoidance condition is met.
- UE1 may perform resource re-evaluation or preemption detection, for details, refer to the description in step 502, and details are not repeated here.
- Step 705 UE1 stops decrementing the counter in listening time unit #A.
- the value of the counter is 3 when the countdown is stopped.
- step 703 reference may be made to related descriptions in step 502, and details are not repeated here.
- Step 706 UE2 accesses the channel at the start time unit of COT1.
- Step 707 UE1 listens at the start time unit of COT1, and determines that the channel state is busy.
- Step 708 UE1 determines that the channel state is idle in the listening time unit #B, continues to decrement the counter, and decrements the counter to 0 at the start time unit of COT2.
- UE1 starts decrementing the counter from 3.
- step 707 reference may be made to related descriptions in step 503, and details are not repeated here.
- Step 709 UE1 sends data on COT2.
- step 701 UE1 can determine the listening window and selection window to select resources, which will not be described here.
- steps 1 to 7 in mode 2 SL mode 2
- UE1 suspends the LBT fallback process, does not access the channel, waits for UE2 to access the channel to send data, and then UE1 accesses the channel to send data after UE2 finishes sending data. In this way, the data of UE2 can be sent in time, which meets the service requirement.
- the embodiment of the present application proposes another communication method, in which a device that has preempted resources shares resources with a device that is to send data, so as to realize normal data transmission, which will be described in detail below.
- the method may include the following steps:
- Step 801 The first terminal device receives first indication information from the second terminal device.
- the first indication information is used to indicate a first resource, and the first resource is a resource reserved by the second terminal device for sending the first data.
- the first indication information reference may be made to the description about the first indication information and the first resource in step 501, which will not be repeated here.
- the relationship between the first terminal device and the second terminal device can be divided into two situations:
- Case 1 the first terminal device is the destination of the data sent by the second terminal device.
- the second terminal device needs to send indication information (that is, third indication information) to the first terminal device, where the indication information is used to instruct the first terminal device to be the destination of data sent by the second terminal device.
- the indication information may include the identity document (identity document, ID) of the source end and the destination end of the data to be sent, wherein, the ID (source ID) of the source end is the ID of the second terminal device, and the ID (destination ID) of the destination end is the ID of the first terminal device.
- the indication information may include the ID of the second terminal device.
- the indication information may include the ID of the second terminal device and the ID of the first terminal device.
- the indication information may include a temporary user group ID (temporary UE group ID, hereinafter referred to as the group ID), which is a group predefined by the network device, for example, the network device divides UE1 and UE2 into the same group.
- the indication information may include a cell ID, and the cell may be a geographically defined cell where UE1 and UE2 co-exist, the cell may be a cell divided according to the scheduling scope of the network device, or the cell may be a cell predefined by the network device. district.
- the first terminal device also needs to receive indication information of the same content from the network device.
- the first terminal device receives the group ID from the network device, and then receives the same group ID from the second terminal device, so that it can determine that it and the second terminal device are in the same group ID, and the network device can predefine the temporary group to include If the ID is the ID of the dual data transmission, the first terminal device can determine itself and the second terminal device as the two parties of the data transmission.
- the network device may pre-configure the corresponding relationship between the first terminal device and the second terminal device.
- the network device may pre-configure the correspondence table between the potential interactive peers of the first terminal device and the first terminal device in the first terminal device, and when the first terminal device receives the ID sent by the second terminal device , it can be determined that the second terminal device is the peer terminal interacting with itself.
- the above-mentioned third indication information may be carried in at least one of the first-level SCI, or the second-level SCI, or SL-MAC CE, or PC5-RRC signaling, and the second-level SCI may refer to step 501.
- Related instructions It should be understood that the above manner of indicating both parties of data transmission is only an example rather than a limitation.
- Case 2 the first terminal device and the second terminal device are not the two parties of the data transmission.
- the first terminal device does not need to determine whether the second terminal device is the counterparty of the data transmission.
- the first terminal device may receive data priority indication information (that is, fourth indication information) from the second terminal device, and the first terminal device determines that the priority of the data sent by the second terminal device is higher than or equal to that of the first terminal device.
- the priority of data sent by an end device Specifically, for the fourth indication information, reference may be made to related descriptions in step 501, and details are not repeated here.
- the first terminal device further receives a reference signal from the second terminal device, and the first terminal device determines that the power of receiving the reference signal is greater than or equal to a reference signal received power threshold.
- a reference signal received power threshold Specifically, reference may be made to relevant descriptions of content B in step 502, and details are not repeated here.
- Step 802 The first terminal device determines a third resource according to the first resource and the first channel occupation time.
- the first channel occupancy time (COT) is a time domain resource corresponding to the fifth resource in the time domain
- the fifth resource is a resource seized by the first terminal device. For example, if the first terminal device accesses the channel (sends data) before the second terminal device, then the first terminal device may be allowed to occupy the channel for the first channel occupation time, and within the first COT duration, the first The terminal device can transmit data through the time-frequency resource (fifth resource). It can also be said that the first terminal device determines the third resource according to the first resource and the fifth resource.
- the above-mentioned third resource is used for the second terminal device to send data, and the third resource belongs to the first resource and the first channel occupation time. Since the start moment (start time unit) of the first channel occupancy time is before the start moment (start time unit) of the first resource, the third resource belongs to the first resource and the first channel occupancy time can be understood as, The three resources belong to the intersection of the first resource and the first channel occupancy time, or an overlapping part. It can also be said that the third resource belongs to the overlapping part of the first resource and the fifth resource.
- the third resource may be the overlapping part of the first resource and the first channel occupation time, that is, the resource corresponding to the third resource in the time domain is the resource corresponding to the first resource in the time domain and the first channel occupation time Intersection of time.
- the third resource may also be a part of the overlapping part of the first resource and the first channel occupation time, that is, the resource corresponding to the third resource in the time domain is the difference between the resource corresponding to the first resource in the time domain and the first channel occupation time. within the range of intersection.
- the first terminal device sends second indication information to the second terminal device, where the second indication information is used to indicate the third resource. Further, the first terminal device sends the second indication information to the second terminal device in the first period, and the start time of the first period is between the start time unit of the fourth resource and the start time unit of the third resource range, and the duration between the start moment of the first period and the start time unit of the fourth resource is greater than or equal to the second threshold.
- the second threshold may be T proc,0 , that is, the first terminal device needs to indicate the information of the third resource to the second terminal device before the start time unit of the third resource.
- the first terminal device needs to determine at least one of the following:
- the first terminal device reserves a resource transmission destination for the second terminal device.
- the starting position of the first resource is after the starting position of the fifth resource, and the first resource overlaps with the fifth resource.
- the first terminal device has enough time for sending the second indication information.
- the first terminal device needs to determine at least one of the following:
- the priority of the data to be sent by the second terminal device is higher than the priority of the data to be sent by the first terminal device.
- the starting position of the first resource is after the starting position of the fifth resource, and the first resource overlaps with the fifth resource.
- the first terminal device has enough time for sending the second indication information.
- K The RSRP of the first resource is higher than the RSRP threshold.
- the first terminal device also needs to successfully decode the first level SCI.
- the first terminal device seizes the channel, it will silence UEs within a certain RSRP threshold range according to the strength of its transmitted signal, and these UEs will not be able to complete the LBT fallback process because they detect that the channel is busy. If the RSRP of a certain UE is low, it means that the distance between the UE and the first terminal device is relatively long. After the first terminal device shares resources with the second terminal device, the second terminal device's lower RSRP cannot silence other devices near the first terminal device, which may cause the channel to be occupied by other devices. In this way, the second terminal device cannot send data, the first terminal device cannot re-access the channel. Therefore, when the RSRP of the reference signal sent by the second terminal device is higher than the RSRP threshold determined by the first terminal device, data can be sent normally. Specifically, reference may be made to content B in step 502, and details are not repeated here.
- the first terminal device may perform resource re-evaluation or preemption detection.
- resource re-evaluation or preemption detection For details, reference may be made to the description in step 502, and details are not repeated here.
- the above-mentioned second indication information may be carried in at least one of the first-level SCI, or the second-level SCI, or SL-MAC CE, or PC5-RRC signaling. Specifically, for the bearing manner of the second indication information, reference may be made to relevant descriptions of the first indication information, and details are not repeated here.
- Step 803 the first terminal device sends data on the fourth resource, and the fourth resource belongs to resources other than the third resource within the first channel occupation time.
- the fourth resource belongs to the fifth resource except the third resource, which means that the fourth resource can be all the fifth resources except the third resource, or the fourth resource can be the fifth resource. A part of the resource other than the third resource.
- the start time (start time unit) of the third resource is after the start time of the fifth resource, which means that the first terminal device has sent a part of data on the resource before the third resource.
- the first terminal device After the second terminal device finishes sending data on the third resource, the first terminal device re-accesses the channel, and sends data on resources subsequent to the third resource. Before the first terminal device accesses the channel, it can listen to the channel. For example, if it is determined that the channel is idle for a period of time, it can access the channel. For details, refer to the second type of listening first. Said explanation, no longer repeat.
- the first terminal device may access the channel according to the first type of listen-before-talk within a period of time, which is not limited in this embodiment of the present application.
- the fourth resource belongs to resources other than the third resource within the first channel occupation time, which may be understood as, within the first channel occupation time, frequency domain resources other than the frequency domain resources corresponding to the third resource, That is to say, the first terminal device and the second terminal device simultaneously send data on the time domain resource corresponding to the third resource, but the frequency domain resources used by the first terminal device and the second terminal device for sending data do not overlap.
- the device that has preempted the resource shares the resource with the device with higher data priority, or shares it with the device that is the sender of data transmission, so that the device with higher priority can send data in time to meet business needs. , which improves the user experience.
- the embodiment of the present application proposes a communication method, as shown in Figure 9, taking the first indication information, the third indication information and the fourth indication information carried in the first-level SCI as an example, taking UE1 as an example of the first terminal device , taking UE2 as an example of the second terminal device, taking COT1 as an example of the first resource, taking COT3 as an example of the third resource, taking COT4 as an example of the fourth resource, and taking COT5 as an example of the fifth resource
- SCI#C is used as an example of the first-level SCI
- SCI#D is used as an example of the second-level SCI.
- the duration of a COT includes the duration for sending PSCCH and PSSCH.
- the method may include the steps of:
- Step 901 UE2 sends SCI#C to UE1, and UE1 receives SCI#C correspondingly.
- SCI#C is carried on the PSCCH.
- This SCI#C is the first level SCI.
- SCI#C includes resource indication information, reference signal and format of SCI#D.
- resource indication information refer to the relevant description about the first indication information in step 801
- format of the reference signal SCI#D refer to the relevant description in step 801, which will not be repeated here.
- SCI#C may include the priority of the data to be sent by UE2.
- Step 902 UE2 sends SCI#D to UE1, and UE1 receives SCI#D accordingly.
- SCI#D is carried on PSSCH. This SCI #D is a second level SCI. SCI#D includes the LBT parameters of UE2.
- SCI#D also includes the ID of UE2 and the ID of UE1.
- IDs refer to the description of the third indication information in step 801, and for the SCI #D, refer to the description of the second-level SCI in step 501, and details are not repeated here.
- the ID of UE2 and the ID of UE1 may not be included in SCI#D.
- UE1 may perform resource re-evaluation or preemption detection, for example, UE1 may perform resource re-evaluation or preemption detection at T 1 -T proc,1 SL .
- resource re-evaluation or preemption detection for example, UE1 may perform resource re-evaluation or preemption detection at T 1 -T proc,1 SL .
- Step 903 UE1 sends data on COT5.
- UE1 accesses a channel (sends data) at T1.
- the resource between T1 and T2 in FIG. 10 is the fifth resource in step 802 .
- Step 904 UE1 determines COT1 according to SCI#C and SCI#D.
- COT1 is the time period between T3 and T4. Specifically, for COT1, reference may be made to the description of the first resource in step 802, and details are not repeated here. That is to say, the resource between T3 and T4 is the first resource in step 801 .
- Step 905 UE1 judges that the avoidance condition is satisfied.
- the avoidance conditions can refer to the relevant descriptions of E, F and G in step 802; when UE2 and UE1 are not the parties of this data transmission, the avoidance conditions can refer to the Relevant descriptions of H, I, J and K in , will not be repeated here.
- Step 906 UE1 sends second indication information to UE2.
- UE1 sends second indication information to UE2 between T5 and T6.
- the second indication information is used to indicate COT3, for example, the second indication information may include the start position T8 of COT3 and the length L of COT. Alternatively, the second indication information may include a start position T8 and an end position T9 of COT3.
- Step 907 UE1 stops sending data at T7.
- Step 908 UE2 determines that the channel state is idle between T7 and T8.
- UE2 may determine that the channel state between T7 and T8 is idle according to the second type of listen-before-talk mechanism.
- Step 909 UE2 starts sending data at T8.
- UE2 sends data between T8 and T9. That is to say, the resources between T8 and T9 are the third resources in step 802 .
- Step 910 UE1 determines that the channel state is idle between T9 and T10.
- UE1 may determine that the channel state between T9 and T10 is idle according to the second type of listen-before-talk mechanism.
- Step 911 UE1 starts to send data at T10.
- UE1 may end sending data at T2, that is to say, the resource between T1 to T7 and T10 to T2 is the fourth resource in step 803 .
- UE1 can determine the listening window and selection window to select resources (COT5), which will not be described here, and the specific steps can refer to the description of steps 1 to 7 in mode 2 (SL mode 2) above.
- FIG. 10 is intended to illustrate the relationship in the time domain, and the separate drawing of multiple COTs in the figure is only for clarity, and does not involve the distinction in the frequency domain.
- UE1 that has preempted the resources is used as the receiving end of UE2, or, when the data priority of UE2 is higher than that of UE1, UE1 will share some or all of the preempted resources with UE2, so that UE2 Data can be sent in time, which meets business requirements and improves communication efficiency.
- the resources seized by the first terminal device and the resources reserved by the second terminal device are in the same channel. It can be understood that the resources seized by the first terminal device are reserved by the second terminal device.
- the resources may also be on different channels, or, part of the frequency domain resources in the resources reserved by the second terminal device are different from those reserved by the first terminal device.
- the channels where the resources preempted by the first terminal device are located are the same, and the other part of the frequency domain resources are different from the channels where the resources preempted by the first terminal device are located. This application does not limit this.
- the embodiment of this application proposes a communication method, as shown in Figure 11, taking the first indication information and the fourth indication information carried on the first-level SCI as an example, taking UE1 as an example of the first terminal device, and UE2 as the second
- COT1 is used as an example of the first resource
- COT2 is used as an example of the second resource
- SCI#E is used as an example of the first-level SCI
- SCI#F is used as the second-level SCI
- the method may include the steps of:
- Step 1101 UE2 sends SCI#E to UE1, and UE1 receives SCI#E accordingly.
- SCI#E is carried on PSCCH.
- SCI#E includes resource indication information, data priority information, reference signal and format of SCI#F. Specifically, reference may be made to related descriptions about the first indication information and the fourth indication information in step 501, and details are not repeated here.
- Step 1102 UE2 sends SCI#F to UE1, and UE1 receives SCI#F accordingly.
- SCI#F is carried on PSSCH.
- SCI#F includes the LBT parameters of UE2.
- Step 1103 UE1 determines the first resource according to SCI#E and SCI#F.
- the first resource is a time-frequency resource within the range of COT1 on channel #3, and the time length between T1 and T2 is the time length of COT1.
- Step 1104 Judging that the avoidance condition is met.
- the avoidance condition in this step also includes: the number of remaining available channels of UE1 is equal to or exceeds the threshold T' th .
- the number of remaining available channels may be channels occupied by UE1 except the channel reserved by UE2, and the threshold T'th may be determined by the total number of channels occupied by UE1.
- UE1 preempts three channels, namely channel #1, channel #2 and channel #3, assuming that the resource reserved by UE2 is on channel #1, the above threshold T'th is 1, UE1 If the number of remaining available channels is 2, which is greater than the threshold, UE1 can avoid channel #1 for UE2 to send data, and channel #2 and channel #3 can be used for UE1 to send data.
- UE1 may perform resource re-evaluation or preemption detection, for details, refer to the description in step 502, and details are not repeated here.
- Step 1105 UE1 sends data on channel #2 and channel #3.
- UE1 sends data on time-frequency resources within the range of COT2 on channel #2 and channel #3, and the time length between T3 and T4 is the time length of COT2.
- Step 1106 UE2 sends data on channel #1.
- UE2 sends data on time-frequency resources within the range of COT1 on channel #1.
- UE1 preempts multiple channels.
- UE1 can give up this channel and send data through the remaining available channels. This channel is used for UE2 to send The data can make the data of UE2 be sent in time, meet business requirements, and improve communication efficiency.
- the network device or the terminal device may include a hardware structure and/or a software module, and a combination of a hardware structure, a software module, or a hardware structure plus a software module form to achieve the above-mentioned functions. Whether one of the above-mentioned functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.
- each functional module in each embodiment of the present application may be integrated into one processor, or physically exist separately, or two or more modules may be integrated into one module.
- the above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules.
- the embodiment of the present application further provides an apparatus 1300 for realizing the function of the session management function network element in the above method.
- the device may be a software module or a system on a chip.
- the system-on-a-chip may be composed of chips, or may include chips and other discrete devices.
- the apparatus 1300 may include: a processing unit 1310 and a communication unit 1320 .
- the communication unit may also be referred to as a transceiver unit, and may include a sending unit and/or a receiving unit, which are respectively used to perform the steps of sending and receiving by the session management function network element in the method embodiment above.
- a communication unit may also be referred to as a transceiver, transceiver, transceiving device, or the like.
- a processing unit may also be called a processor, a processing board, a processing module, a processing device, and the like.
- the device in the communication unit 1320 for realizing the receiving function may be regarded as a receiving unit
- the device in the communication unit 1320 for realizing the sending function may be regarded as a sending unit, that is, the communication unit 1320 includes a receiving unit and a sending unit.
- the communication unit may sometimes be called a transceiver, a transceiver, or an interface circuit, etc.
- the receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit, etc.
- the sending unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit, etc.
- the communication unit can be used for receiving sidelink control information and sending data.
- the processing unit may be used to analyze sidelink control information, determine transmission resources, determine the first channel occupancy status, determine whether avoidance conditions are satisfied, and/or execute the LBT process and the like.
- the communication unit may be configured to send sidelink control information, receive second indication information, and/or send data.
- the processing unit can be used to determine the transmission resource and/or execute the LBT process and so on.
- processing unit 1310 and the communication unit 1320 can also perform other functions.
- the processing unit 1310 and the communication unit 1320 can also perform other functions.
- the processing unit 1310 and the communication unit 1320 can also perform other functions.
- FIG. 14 an apparatus 1400 provided in the embodiment of the present application is shown.
- the apparatus shown in FIG. 14 may be an implementation manner of a hardware circuit of the apparatus shown in FIG. 14 .
- the communication device may be applicable to the flow chart shown above, and execute the functions of the terminal device or the network device in the above method embodiments. For ease of illustration, FIG. 14 only shows the main components of the communication device.
- the communication device 1400 may be a terminal device, capable of realizing the functions of the first terminal device or the second terminal device in the method provided in the embodiment of the present application.
- the communication device 1400 may also be a device capable of supporting the first terminal device or the second terminal device to implement corresponding functions in the method provided by the embodiment of the present application.
- the communication device 1400 can be a chip system.
- the system-on-a-chip may be composed of chips, or may include chips and other discrete devices. For specific functions, refer to the descriptions in the foregoing method embodiments.
- the communication device 1400 includes one or more processors 1410, configured to implement or support the communication device 1400 to implement the functions of the first terminal device or the second terminal device in the method provided by the embodiment of the present application.
- the processor 1410 may also be referred to as a processing unit or a processing module, and may implement certain control functions.
- the processor 1410 may be a general-purpose processor or a special-purpose processor or the like. Examples include: CPU, application processor, modem processor, graphics processor, image signal processor, digital signal processor, video codec processor, controller, memory, and/or neural network processor wait.
- the central processing unit may be used to control the communication device 1400, execute software programs and/or process data.
- processors may be independent devices, or may be integrated in one or more processors, for example, integrated in one or more application-specific integrated circuits.
- processors in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
- a general-purpose processor can be a microprocessor, or any conventional processor.
- the communication device 1400 includes one or more memories 1420 for storing instructions 1440, and the instructions can be executed on the processor 1410, so that the communication device 1400 executes the methods described in the foregoing method embodiments.
- the memory 1420 is coupled to the processor 1410 .
- the coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
- the processor 1410 may operate in cooperation with the memory 1420 . At least one of the at least one memory may be included in the processor. It should be noted that the memory 1420 is not necessary, so it is shown with a dotted line in FIG. 14 .
- data may also be stored in the memory 1420 .
- the processor and memory can be set separately or integrated together.
- the memory 1420 may be a non-volatile memory, such as a hard disk (hard disk drive, HDD) or a solid-state drive (solid-state drive, SSD), etc., and may also be a volatile memory (volatile memory), For example random-access memory (random-access memory, RAM).
- Processor in the embodiment of the present application can also be flash memory, read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM) ), electrically erasable programmable read-only memory (electrically EPROM, EEPROM), registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium known in the art.
- An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium.
- the storage medium may also be a component of the processor.
- the processor and storage medium can be located in the ASIC.
- the ASIC can be located in a network device or a terminal device. Certainly, the processor and the storage medium may also exist in the network device or the terminal device as discrete components.
- a memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
- the memory in the embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, and is used for storing program instructions and/or data.
- the communication device 1400 may include instructions 1430 (sometimes may also be referred to as code or program), and the instructions 1430 may be executed on the processor, so that the communication device 1400 executes the methods described in the above embodiments .
- Data may be stored in the processor 1410 .
- the communication device 1400 may further include a transceiver 1450 and an antenna 1406 .
- the transceiver 1450 may be called a transceiver unit, a transceiver module, a transceiver, a transceiver circuit, a transceiver, an input and output interface, etc., and is used to realize the transceiver function of the communication device 1400 through the antenna 1406 .
- the processor 1410 and transceiver 1450 described in this application can be implemented in integrated circuit (integrated circuit, IC), analog IC, radio frequency integrated circuit (radio frequency identification, RFID), mixed signal IC, ASIC, printed circuit board (printed circuit) board, PCB), or electronic equipment, etc.
- the communication device described herein can be an independent device (for example, an independent integrated circuit, a mobile phone, etc.), or it can be a part of a larger device (for example, a module that can be embedded in other devices).
- a module for example, a module that can be embedded in other devices.
- the communication device 1400 may further include one or more of the following components: a wireless communication module, an audio module, an external memory interface, an internal memory, a universal serial bus (universal serial bus, USB) interface, a power management module, an antenna, Speakers, microphones, I/O modules, sensor modules, motors, cameras, or displays, etc. It can be understood that, in some embodiments, the communication device 1400 may include more or fewer components, or some components may be integrated, or some components may be separated. These components may be realized by hardware, software, or a combination of software and hardware.
- the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) having computer-usable program code embodied therein.
- These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions
- the device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
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Abstract
本申请实施例提出一种通信方法、装置及系统,该方法中,在非授权频谱上,抢占了资源或者可能抢占资源的终端装置,为预约了资源的终端装置及时避让,或者向预约了资源的终端装置分享资源,使得预约了资源的终端装置能够及时发送数据,满足了业务需求,显著提升了用户体验。
Description
本申请要求于2022年03月01日提交中国专利局、申请号为202210194217.5、申请名称为“通信方法、装置及系统”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请涉及通信领域。尤其涉及一种通信方法、装置及系统。
在无线通信系统中,按照使用频段的不同,可以分为授权频段和非授权频段,在局域空间内使能非授权频段的侧行链路(sidelink,SL)通信是一个重要演进方向。目前,多个用户设备(userequipment,UE)通过侧行链路在非授权频谱上通信时,需要进行自主的资源竞争,急需发送数据的UE可能无法竞争到资源,无法满足业务需求,严重影响用户体验。因此,如何及时发送待传输数据,以满足业务需求,是亟待解决的问题。
发明内容
本申请实施例提出一种通信方法、装置及系统,该方法能够及时发送数据,满足业务需求。
第一方面,提供了一种通信方法,该方法可以包括:第一终端装置从第二终端装置接收第一指示信息,该第一指示信息用于指示第一资源,该第一资源为第二终端装置预约的用于发送第一数据的资源,该第一资源在频域上对应的资源属于第一信道,该第一终端装置根据该第一指示信息确定第二资源,该第一终端装置在该第二资源上发送第二数据,该第二资源的起始时间单元在该第一资源的结束时间单元之后,第二资源在频域上对应的资源属于该第一信道,该第一终端装置在第二资源上发送第二数据,该第二资源的起始时间单元在该第一资源的结束时间单元之后。
该方法通过第一终端装置延迟接入信道,在接入信道的时机上为第二终端装置及时避让,能够使得第二终端装置使用预约资源发送数据,降低了数据传输时延,满足了业务需求,提高了通信效率。
结合第一方面,在第一方面的某些实现方式中,该第一终端装置在第一侦听时间单元通过先听后说过程侦听该第一信道的状态为空闲,根据该第一资源在该第一侦听时间单元中止先听后说过程,该第一侦听时间单元在该第一资源的起始的时间单元之前。
结合第一方面,在第一方面的某些实现方式中,该第一资源的起始时间单元与该计数器的取值为M的第一个侦听时间单元之间的时长小于或等于第一阈值,该第一阈值为大于0小于该第二数据的时延要求。
该方式中,第一终端装置中止递减计数器的时间段小于一定的门限,由于第一终端装置和第二终端装置在该时间段内都未接入信道,限制该时间段的时长,能够避免资源浪费。
结合第一方面,在第一方面的某些实现方式中,该第一终端装置将计数器的取值递减为M后,中止递减,其中1≤M≤Q,该Q为该计数器的初始取值。
结合第一方面,在第一方面的某些实现方式中,该第一阈值是根据该第二资源在时域上对应的时长确定的。
结合第一方面,在第一方面的某些实现方式中,该第一终端装置在第二侦听时间单元侦听该第一信道的状态为空闲,从M开始继续递减该计数器的取值,该第二侦听时间单元在该第一资源的结束时间单元之后,该第二资源的起始时间单元为该计数器的取值递减至0时所在的时间单元。
该方式中,第一终端装置在第二终端装置数据发送结束后可以接入信道,第一终端装置的待发送数据得以正常发送,能够进一步满足业务需求,同时,避免浪费第二终端装置发送数据使用的资源之后的时频资源。
结合第一方面,在第一方面的某些实现方式中,该第一终端装置从该第二终端装置接收第一参考信号,该第一终端装置确定接收该第一参考信号的功率大于或等于参考信号接收功率阈值。
第一终端装置在将资源共享给第二终端装置后,第二终端装置的参考信号接收功率如果低于门限,无法静默第一终端装置附近的其他设备,导致信道可能被其他设备占用,第一终端装置无法在该资源内重新接入信道。因此,在第二终端装置的参考信号接收功率大于或等于参考信号接收功率阈值时,第一终端装置确定避让,能够避免第一终端装置避让后的资源被第二终端装置以外的装置抢占,提高了第二终端装置接入信道的成功率,进一步提高了通信效率。
结合第一方面,在第一方面的某些实现方式中,该第一终端装置从该第二终端装置接收第三指示信息,该第三指示信息用于指示该第一终端装置为该第二终端装置发送数据的目的端。
该方式中,当第一终端装置为第二终端装置的数据接收端(目的端)时,第一终端装置为第二终端装置避让,能够及时接收该数据,以满足业务需求。
结合第一方面,在第一方面的某些实现方式中,该第一终端装置从该第二终端装置接收第四指示信息,该第四指示信息用于指示第一数据的优先级,该第一终端装置确定第一数据的优先级高于或等于第二数据的优先级。
该方式中,第一终端装置为更高优先级数据对应的装置避让,能够及时满足高优先级数据的业务需求。
结合第一方面,在第一方面的某些实现方式中,该第一指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者用户设备与用户设备之间通信(PC5)无线资源控制信令中的至少一个。
结合第一方面,在第一方面的某些实现方式中,该第三指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第一方面,在第一方面的某些实现方式中,该第四指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
应理解,上述指示信息也可以承载于其他网络设备配置的信令,或预配置的信令。
第二方面,提供了一种通信方法,该方法可以包括:第一终端装置从第二终端装置接收第一指示信息,该第一指示信息用于指示第一资源,该第一资源为第二终端装置预约的用于发送第一数据的资源,该第一终端装置根据该第一资源和第一信道占用时间确定第三资源,该第三资源属于该第一资源和该第一信道占用时间,该第三资源用于第二终端装置发送数据,该第一终端装置在第四资源上发送数据,该第四资源属于该第一信道占用时间内除该第三资源以外的资源。
其中,第一信道占用时间可以是第五资源在时域上对应的时长。换句话说,第一终端装置从第二终端装置接收第一指示信息,该第一指示信息用于指示第一资源,该第一资源为第二终端装置预约的用于发送第一数据的资源,该第一终端装置确定第五资源,该第五资源的起始时间单元在该第一资源的起始时间单元之前,该第五资源与该第一资源有重叠,该第一终端装置根据该第一资源和该第五资源确定第三资源,该第三资源属于该第一资源和该第五资源重叠的部分,该第三资源用于第二终端装置发送第一数据,该第一终端装置在第四资源上发送第二数据,该第四资源属于该第五资源中除该第三资源以外的部分。
该方法通过第一终端装置向第二终端装置分享资源,使得第二终端装置的数据能够及时发送,满足了业务需求。
结合第二方面,在第二方面的某些实现方式中,该第一终端装置向该第二终端装置发送第二指示信息,该第二指示信息用于指示该第三资源。
该方式中,第一终端装置向第二终端装置指示分享的资源,以便于第二终端装置快速确定该资源,进一步降低了第二终端装置发送数据的时延。
结合第二方面,在第二方面的某些实现方式中,该第一终端装置在第一时段向该第二终端装置发送该第二指示信息,该第一时段的起始时刻在该第四资源的起始时间单元与该第三资源的起始时间单元范围内,且该第一时段的起始时刻与该第四资源的起始时间单元之间的时长大于或等于第二阈值。
示例地,第二阈值可以是Tproc,0。
第一终端装置需要确保有足够的发送第一指示信息的时间且第二终端有足够的时间译码指示信息时才分享资源,否则第一指示信息无法发送,或者发送失败时第二终端装置无法获知资源位置,此时第一终端装置和第二终端装置都未使用第三资源,该方式避免了这种情况下的资源浪费。
结合第二方面,在第二方面的某些实现方式中,该第一终端装置从该第二终端装置接收第三指示信息,该第三指示信息用于指示该第一终端装置为该第二终端装置发送数据的目的端。
当第一终端装置为第二终端装置的数据接收端(目的端)时,第一终端装置向第二终端装置分享资源,能够及时接收该数据,以满足业务需求。
结合第二方面,在第二方面的某些实现方式中,该第一终端装置从该第二终端装置接收第四指示信息,该第四指示信息用于指示该第一数据的优先级,该第一终端装置确定该第一数据的优先级高于或等于第二数据的优先级。
该方式中,第一终端装置为更高优先级数据对应的装置分享资源,能够及时满足高优先级数据的业务需求。
结合第二方面,在第二方面的某些实现方式中,该第一终端装置从该第二终端装置接收第一参考信号,该第一终端装置确定接收该第一参考信号的功率大于或等于参考信号接收功率阈值。
第一终端装置在将资源共享给第二终端装置后,第二终端装置的参考信号接收功率如果低于门限,无法静默第一终端装置附近的其他设备,导致信道可能被其他设备占用,第一终端装置无法在该资源内重新接入信道。因此,在第二终端装置的参考信号接收功率大于或等于参考信号接收功率阈值时,第一终端装置确定避让,能够避免第一终端装置避让后的资源被第二终端装置以外的装置抢占,提高了第二终端装置接入信道的成功率,进一步提高了通信效率。
结合第二方面,在第二方面的某些实现方式中,该第一指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者无线资源控制信令中的至少一个。
结合第二方面,在第二方面的某些实现方式中,该第二指示信息承载于来自该第一终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第二方面,在第二方面的某些实现方式中,该第三指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第二方面,在第二方面的某些实现方式中,该第四指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
应理解,上述指示信息也可以承载于其他网络设备配置的信令,或预配置的信令。
第三方面,提供了一种通信方法,该方法可以包括:第二终端装置发送第一指示信息,该第一指示信息用于指示第一资源,该第一资源为第二终端装置预约的用于发送第一数据的资源,该第二终端装置在第三资源上发送第一数据,该第三资源是根据该第一资源和第一信道占用时间确定的,该第三资源属于该第一资源和第一信道占用时间,该第一占用信道的起始时间单元在该第一资源的起始时间单元之前。
结合第三方面,在第三方面的某些实现方式中,该第二终端装置从该第一终端装置接收第二指示信息,该第二指示信息用于指示该第三资源。
结合第三方面,在第三方面的某些实现方式中,该第二终端装置在第一时段从该第一终端装置接收第二指示信息,该第一时段的起始时刻在该第四资源的起始时间单元与该第三资源的起始时间单元范围内,且该第一时段的起始时刻与该第四资源的起始时间单元之间的时长大于或等于第二阈值。
示例地,第二阈值可以是Tproc,0。
结合第三方面,在第三方面的某些实现方式中,该第二终端装置发送第三指示信息,该第三指示信息用于指示该第一终端装置为该第二终端装置发送数据的目的端。
结合第三方面,在第三方面的某些实现方式中,该第二终端装置发送第一参考信号。
结合第三方面,在第三方面的某些实现方式中,该第一指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控
制元素或者PC5无线资源控制信令中的至少一个。
结合第三方面,在第三方面的某些实现方式中,该第二指示信息承载于来自该第一终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第三方面,在第三方面的某些实现方式中,该第三指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第三方面,在第三方面的某些实现方式中,该第四指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者无线资源控制信令中的至少一个。
应理解,第三方面是与第二方面中第一终端装置对应的第二终端装置的实现方式,第二方面的解释、补充和有益效果同样适用于第三方面,不再赘述。
第四方面,提供一种通信装置,该通信装置包括收发单元和处理单元,该收发单元用于从第二终端装置接收第一指示信息,该第一指示信息用于指示第一资源,该第一资源为第二终端装置预约的用于发送第一数据的资源,该第一资源在频域上对应的资源属于第一信道,该处理单元用于根据该第一指示信息确定第二资源,该收发单元还用于在第二资源上发送第二数据,该第二资源的起始时间单元在该第一资源的结束时间单元之后,第二资源在频域上对应的资源属于该第一信道。
结合第四方面,在第四方面的某些实现方式中,处理单元用于在第一侦听时间单元通过先听后说过程侦听该第一信道的状态为空闲,该处理单元还用于根据该第一资源在该第一侦听时间单元中止先听后说过程,该第一侦听时间单元在该第一资源的起始的时间单元之前。
结合第四方面,在第四方面的某些实现方式中,该第一资源的起始时间单元与该计数器的取值为M的第一个侦听时间单元之间的时长小于或等于第一阈值,该第一阈值为大于0小于该第二数据的时延要求。
结合第四方面,在第四方面的某些实现方式中,该处理单元用于将计数器的取值递减为M后,中止递减,其中1≤M≤Q,该Q为该计数器的初始取值。
结合第四方面,在第一方面的某些实现方式中,该第一阈值是根据该第二资源在时域上对应的时长确定的。
结合第四方面,在第四方面的某些实现方式中,该处理单元还用于在第二侦听时间单元确定第一信道状态为空闲,从M开始继续递减该计数器的取值,该第二侦听时间单元在该第一资源的结束时间单元之后,该第二资源的起始时间单元为该计数器的取值递减至0时所在的时间单元。
结合第四方面,在第四方面的某些实现方式中,该收发单元还用于从该第二终端装置接收第四指示信息,该第四指示信息用于指示该第一数据的优先级,该第一终端装置确定该第一数据的优先级高于或等于该第二数据的优先级。
结合第四方面,在第四方面的某些实现方式中,该第一指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者无线资源控制信令中的至少一个。
结合第四方面,在第四方面的某些实现方式中,该第三指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者无线资源控制信令中的至少一个。
结合第四方面,在第四方面的某些实现方式中,该第四指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者无线资源控制信令中的至少一个。
应理解,第四方面是与第一方面对应的装置侧的实现方式,第一方面的解释、补充和有益效果同样适用于第四方面,不再赘述。
第五方面,提供一种通信装置,该通信装置包括收发单元和处理单元,该收发单元用于从第二终端装置接收第一指示信息,该第一指示信息用于指示第一资源,该第一资源为第二终端装置预约的用于发送第一数据的资源,该处理单元用于根据该第一资源和第一信道占用时间确定第三资源,该第三资源属于该第一资源和该第一信道占用时间,该第三资源用于第二终端装置发送第二数据,该收发单元还用于在第四资源上发送第一数据,该第四资源属于该第一信道占用时间内除该第三资源以外的资源。
结合第五方面,在第五方面的某些实现方式中,该收发单元还用于向该第二终端装置发送第二指示信息,该第二指示信息用于指示该第三资源。
结合第五方面,在第五方面的某些实现方式中,该收发单元具体用于在第一时段向该第二终端装置发送该第二指示信息,该第一时段的起始时刻在该第四资源的起始时间单元与该第三资源的起始时间单元范围内,且该第一时段的起始时刻与该第四资源的起始时间单元之间的时长大于或等于第二阈值。
示例地,第二阈值可以是Tproc,0。
结合第五方面,在第五方面的某些实现方式中,该收发单元还用于从该第二终端装置接收第三指示信息,该第三指示信息用于指示该第一终端装置为该第二终端装置发送第一数据的目的端。
结合第五方面,在第五方面的某些实现方式中,该收发单元还用于从该第二终端装置接收第四指示信息,该第四指示信息用于指示该第一数据的优先级,该处理单元还用于确定该第一数据优先级高于或等于该第二数据的优先级。
结合第五方面,在第五方面的某些实现方式中,该收发单元从该第二终端装置接收第一参考信号,该处理单元还用于确定接收该第一参考信号的功率大于或等于参考信号接收功率阈值。
结合第五方面,在第五方面的某些实现方式中,该第一指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者无线资源控制信令中的至少一个。
结合第五方面,在第五方面的某些实现方式中,该第二指示信息承载于来自该第一终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第五方面,在第五方面的某些实现方式中,该第三指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第五方面,在第五方面的某些实现方式中,该第四指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
应理解,第五方面是与第二方面对应的装置侧的实现方式,第二方面的解释、补充和有益效果同样适用于第五方面,不再赘述。
第六方面,提供一种通信装置,该通信装置包括收发单元和处理单元,该收发单元用于发送第一指示信息,该第一指示信息用于指示第一资源,该第一资源为第二终端装置预约的用于发送第一数据的资源,该收发单元还用于在第三资源上发送第一数据,该第三资源是根据该第一资源和第一信道占用时间确定的,该第三资源属于该第一资源和第一信道占用时间,该第一占用信道的起始时间单元在该第一资源的起始时间单元之前。
结合第六方面,在第六方面的某些实现方式中,该收发单元用于从该第一终端装置接收第二指示信息,该第二指示信息用于指示该第三资源。
结合第六方面,在第六方面的某些实现方式中,该收发单元具体用于在第一时段从该第一终端装置接收第二指示信息,该第一时段的起始时刻在该第四资源的起始时间单元与该第三资源的起始时间单元范围内,且该第一时段的起始时刻与该第四资源的起始时间单元之间的时长大于或等于第二阈值。
示例地,第二阈值可以是Tproc,0。
结合第六方面,在第六方面的某些实现方式中,该收发单元还用于发送第三指示信息,该第三指示信息用于指示该第一终端装置为该第二终端装置发送第一数据的目的端。
结合第六方面,在第六方面的某些实现方式中,该收发单元还用于发送第一参考信号。
结合第六方面,在第六方面的某些实现方式中,该第一指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第六方面,在第六方面的某些实现方式中,该第二指示信息承载于来自该第一终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第六方面,在第六方面的某些实现方式中,该第三指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
结合第六方面,在第六方面的某些实现方式中,该第四指示信息承载于来自该第二终端装置的第一级侧行链路控制信息、侧行链路媒体接入控制控制元素或者无线资源控制信令。
应理解,第六方面是与第三方面对应的装置侧的实现方式,第三方面的解释、补充和有益效果同样适用于第六方面,不再赘述。
第七方面,提供一种计算机可读介质,该计算机可读介质存储用于通信装置执行的程序代码,该程序代码包括用于执行第一方面或第二方面或第三方面,第一方面或第二方面或第三方面中任一可能的实现方式,或,第一方面或第二方面或第三方面中所有可能的实现方式的方法中的通信方法的指令。
第八方面,提供了一种包含指令的计算机程序产品,其在计算机上运行时,使得计算
机执行上述第一方面或第二方面或第三方面,或,第一方面或第二方面或第三方面中任一可能的实现方式,或,第一方面或第二方面或第三方面中所有可能的实现方式的方法。
第九方面,提供了一种通信系统,该通信系统包括具有实现上述第一方面或第二方面或第三方面,或,第一方面或第二方面或第三方面中任一可能的实现方式,或,第一方面或第二方面或第三方面中所有可能的实现方式的方法及各种可能设计的功能的装置。
第十方面,提供了一种处理器,用于与存储器耦合,用于执行上述第一方面或第二方面或第三方面,或,第一方面或第二方面或第三方面中任一可能的实现方式,或,第一方面或第二方面或第三方面中所有可能的实现方式中的方法。
第十一方面,提供了一种芯片,芯片包括处理器和通信接口,该通信接口用于与外部器件或内部器件进行通信,该处理器用于实现上述第一方面或第二方面或第三方面,或,第一方面或第二方面或第三方面中任一可能的实现方式,或,第一方面或第二方面或第三方面中所有可能的实现方式中的方法。
可选地,该芯片还可以包括存储器,该存储器中存储有指令,处理器用于执行存储器中存储的指令或源于其他的指令。当该指令被执行时,处理器用于实现上述第一方面或第二方面或第三方面或其任意可能的实现方式中的方法。
可选地,该芯片可以集成在终端设备和/或网络设备上。
图1示出了本申请实施例适用的一种系统架构。
图2示出了本申请实施例适用的一种时隙。
图3示出了本申请实施例适用的一种先听后说过程。
图4示出了本申请实施例适用的另一种先听后说过程。
图5示出了本申请实施例提出的一种通信方法的示意图。
图6示出了本申请实施例提出的一种传输资源的示意图。
图7示出了本申请实施例提出的一种通信方法的流程示意图。
图8示出了本申请实施例提出的又一种通信方法的示意图。
图9示出了本申请实施例提出的又一种通信方法的流程示意图。
图10示出了本申请实施例提出的又一种传输资源的示意图。
图11示出了本申请实施例提出的又一种通信方法的流程示意图。
图12示出了本申请实施例提出的又一种传输资源的示意图。
图13示出了本申请实施例提出的一种通信装置的示意性框图。
图14示出了本申请实施例提出的另一种通信装置的示意性框图。
下面将结合附图,对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统,比如5G(第五代(5th generation,5G)或新无线(new radio,NR)系统、长期演进(long term evolution,LTE)系统、LTE频分双工(frequency division duplex,FDD)系统、LTE时分双工(time division duplex,TDD)系统等。本申请提供的技术方案还可以应用于未来的通信系统,如第六代移动通信
系统。本申请提供的技术方案还可以应用于设备到设备(device to device,D2D)通信,车到万物(vehicle-to-everything,V2X)通信,机器到机器(machine to machine,M2M)通信,机器类型通信(machine type communication,MTC),以及物联网(internet of things,IoT)通信系统或者其他通信系统)。
另外,本申请实施例提供的技术方案可以应用于网络设备到终端设备之间的链路,也可以应用于设备间的链路,例如设备到设备(device to device,D2D)链路。D2D链路,也可以称为侧行链路,其中侧行链路也可以称为边链路或副链路等。在本申请实施例中,D2D链路,或边链路或副链路都是指相同类型的设备之间建立的链路,其含义相同。所谓相同类型的设备,可以是终端设备到终端设备之间的链路,也可以是网络设备到网络设备之间的链路,还可以是中继节点到中继节点之间的链路等,本申请实施例对此不做限定。对于终端设备和终端设备之间的链路,有第三代合作伙伴计划(3rd generation partnership project,3GPP)的版本(release,Rel)-12/13定义的D2D链路,也有3GPP为车联网定义的车联万物链路。应理解,V2X具体又包括车与车(vehicle-to-vehicle,V2V)、车与路侧基础设施(vehicle-to-infrastructure,V2I)、车与行人(vehicle-to-pedestrian,V2P)的直接通信,以及车与网络(vehicle-to-network,V2N)或车到任何实体的V2X链路,包括Rel-14/15。V2X还包括目前3GPP正在研究的Rel-16及后续版本的基于NR系统的V2X链路等。V2V指的是车辆间的通信;V2P指的是车辆与人(包括行人、骑自行车的人、司机、或乘客)的通信;V2I指的是车辆与基础设施的通信,基础设施例如路侧单元(road side unit,RSU)或者网络设备,另外还有一种V2N可以包括在V2I中,V2N指的是车辆与网络设备的通信。其中,RSU包括两种类型:终端类型的RSU,由于布在路边,该终端类型的RSU处于非移动状态,不需要考虑移动性;基站类型的RSU,可以给与之通信的车辆提供定时同步及资源调度。
本申请实施例应用的移动通信系统的架构示意图。如图1所示,图1是本申请的实施例应用的通信系统1000的架构示意图。如图1所示,该通信系统包括无线接入网100,可选的,可选的,通信系统1000还可以包括核心网200和互联网300。其中,无线接入网100可以包括至少一个无线接入网设备(如图1中的110a和110b),还可以包括至少一个终端(如图1中的120a-120j)。终端通过无线的方式与无线接入网设备相连,无线接入网设备通过无线或有线方式与核心网连接。核心网设备与无线接入网设备可以是独立的不同的物理设备,也可以是将核心网设备的功能与无线接入网设备的逻辑功能集成在同一个物理设备上,还可以是一个物理设备上集成了部分核心网设备的功能和部分的无线接入网设备的功能。终端和终端之间以及无线接入网设备和无线接入网设备之间可以通过有线或无线的方式相互连接。图1只是示意图,该通信系统中还可以包括其它网络设备,如还可以包括无线中继设备和无线回传设备,在图1中未画出。
应理解,本申请通信系统中的信息发送端可以是网络设备,也可以是终端设备,信息接收端可以是网络设备,也可以是终端设备,本申请对此不作限定。
本申请实施例中UE可以称为终端设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。
终端设备可以是一种向用户提供语音/数据的设备,例如,具有无线连接功能的手持
式设备、车载设备等。终端设备可包括用户设备,有时也称为终端、接入站、UE站、远方站、无线通信设备、或用户装置等等。所述终端设备用于连接人,物,机器等,可广泛用于各种场景,例如包括但不限于以下场景:蜂窝通信、D2D、V2X、机器到机器/机器类通信(machine-to-machine/machine-type communications,M2M/MTC)、物联网(internet of things,IoT)、虚拟现实(virtual reality,VR)、增强现实(augmented reality,AR)、工业控制(industrial control)、无人驾驶(self driving)、远程医疗(remote medical)、智能电网(smart grid)、智能家具、智能办公、智能穿戴、智能交通、智慧城市(smart city)、无人机、机器人等场景的终端设备。例如,所述终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、VR终端、AR终端、工业控制中的无线终端、整车、整车中的无线通信模块、车载T-box(Telematics BOX)、路侧单元RSU、无人驾驶中的无线终端、IoT网络中智能音箱、远程医疗中的无线终端设备、智能电网中的无线终端设备、运输安全中的无线终端设备、智慧城市中的无线终端设备,或智慧家庭中的无线终端设备等等,本申请实施例对此并不限定。
作为示例而非限定,在本申请实施例中,该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备,是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称,如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上,或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备,更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能,例如:智能手表或智能眼镜等,以及只专注于某一类应用功能,需要和其它设备如智能手机配合使用,如各类进行体征检测的智能手环、智能首饰等。此外,在本申请实施例中,终端设备还可以是IoT系统中的终端设备,IoT是未来信息技术发展的重要组成部分,其主要技术特点是将物品通过通信技术与网络连接,从而实现人机互连,物物互连的智能化网络。
如上介绍的各种终端设备,如果位于车辆上(例如放置在车辆内或安装在车辆内),都可以认为是车载终端设备,车载终端设备例如也称为车载单元(on-board unit,OBU)。本申请的终端设备还可以是作为一个或多个部件或者单元而内置于车辆的车载模块、车载模组、车载部件、车载芯片或者车载单元,车辆通过内置的所述车载模块、车载模组、车载部件、车载芯片或者车载单元可以实施本申请的方法。
应理解,该无线通信系统中的网络设备可以是能和终端设备通信的设备,该网络设备也可以称为接入网设备或无线接入网设备,如网络设备可以是基站。本申请实施例中的网络设备可以是指将终端设备接入到无线网络的无线接入网(radio access network,RAN)节点(或设备)。基站可以广义的覆盖如下中的各种名称,或与如下名称进行替换,比如:节点B(NodeB)、演进型基站(evolved NodeB,eNB)、下一代基站(next generation NodeB,gNB)、中继站、接入点、传输点(transmitting and receiving point,TRP)、发射点(transmitting point,TP)、主站(master eNodeB,MeNB)、辅站(secondary eNodeB,SeNB)、多制式无线(multi standard radio,MSR)节点、家庭基站、网络控制器、接入节点、无线节点、接入点(access point,AP)、传输节点、收发节点、基带单元(base band unit,BBU)、射频拉远单元(remote radio unit,RRU)、有源天线单元(active antenna unit,AAU)、射频头(remote radio head,RRH)、中心单元(central unit,CU)、分布式单元(distributed
unit,DU)、定位节点等。基站可以是宏基站、微基站、中继节点、施主节点或类似物,或其组合。基站还可以指用于设置于前述设备或装置内的通信模块、调制解调器或芯片。基站还可以是移动交换中心以及D2D、V2X、M2M通信中承担基站功能的设备、6G网络中的网络侧设备、未来的通信系统中承担基站功能的设备等。基站可以支持相同或不同接入技术的网络。本申请的实施例对网络设备所采用的具体技术和具体设备形态不做限定。
在本申请的实施例中,基站的功能也可以由基站中的模块(如芯片)来执行,也可以由包含有基站功能的控制子系统来执行。这里的包含有基站功能的控制子系统可以是智能电网、工业控制、智能交通、智慧城市等上述应用场景中的控制中心。终端的功能也可以由终端中的模块(如芯片或调制解调器)来执行,也可以由包含有终端功能的装置来执行。
为了便于理解本申请,对随机接入过程和相关概念进行简单描述。
1.接口:用户设备与网络设备之间的通信接口(Uu interface)可以称为Uu接口,用户设备与用户设备之间的通信接口(PC5interface)可以称为PC5接口,PC5接口中的传输链路被定义为侧行链路(sidelink,SL)。
2.非授权频段(unlicensed spectrum):在无线通信系统中,按照使用频段的不同,可以分为授权频段和非授权频段。在授权频段中,用户基于中心节点的调度使用频谱资源。在非授权频段中,发射节点需要按照竞争的方式使用频谱资源,具体地,通过先听后说(listen-before-talk,LBT)的方式竞争信道。在新一代5G NR系统中,非授权频段中的NR协议技术统称为NR-U,期望通过NR-U进一步提升相应的Uu接口通信性能。在局域空间内使能非授权频段的SL通信是一个重要演进方向,相应协议技术可以统称为SL-U。与Uu接口类似,通过SL-U工作的UE也需要基于LBT机制与附近的Wi-Fi设备共存。之所以LBT机制成为非授权频段的必选特性,是因为世界各个地区对于非授权频段的使用有法规(regulation)要求。工作于不同通信协议的各种形态的UE,只有满足法规才能使用非授权频段,进而相对公平、高效地使用频谱资源。
3.时域资源:在SL资源池的时域上,包括一个或多个时间单元,时间单元可以为一个或若干个符号、一个或若干个时隙(slot)、一个或若干个微时隙(mini-slot)、一个或若干个子帧,或者,一个或若干个帧等。一个或多个时间单元可以是在时间上连续的,也可以是离散的。应理解,在一个资源池内的时域单元在逻辑上是连续的。本申请实施例中,对符号、微时隙、时隙、子帧和帧的一种定义的理解可以参考3GPP TS 38.211。
如图2所示,时隙1至时隙8是时间上连续的时隙,称这种时隙为物理时隙(physical slot)。将物理时隙——时隙1,时隙3,时隙5和时隙8配置为属于一个资源池的时隙。因资源池所包含的时隙在时间上可以是不连续的,那么从该资源池的角度而言,物理时隙上的时隙1,时隙3,时隙5和时隙8对应为资源池中的时隙1’、时隙2’、时隙3’和时隙4’,那么。该资源池中包含的连续的时隙(即时隙1’、时隙2’、时隙3’和时隙4’)为从资源池的逻辑上讲是连续的时隙,称这种逻辑上连续但时间上不一定连续的时隙为逻辑时隙(logical slot)。
起始时间单元:一块资源在时域上的第一个时间单元。
结束时间单元:一块资源在时域上的最后一个时间单元。
以时隙为时间单元的一个示例,图2所示的资源在时域上包括时隙1-时隙8,则时隙1为该资源的起始时间单元,时隙8为该资源的结束时间单元。
4.频域资源:在SL资源池的频域上,包括一个或多个频域单元,频域单元可以是一个资源元素(resource element,RE)或若干个RE、一个资源块(resource block,RB)或若干个RB,或者,一个子信道(sub channel)或若干个子信道。其中,一个子信道的大小,表示一个子信道包括一个或多个在频域上连续的(continuous)或交错的(interlaced)RB数量,可以是10、12、15、20、25或50等整数。
5.侧行链路资源分配模式:NR SL支持两种资源分配方式,即模式1和模式2。
模式1(SL mode 1):由网络设备分配侧行链路传输所使用的资源,模式一通常被用于网络设备覆盖范围内的侧行链路通信。
模式2(SL mode 2):由UE自主选择侧行链路传输所使用的资源。一种自主选择资源的方式:发送端UE根据自身侦听窗内侦听的结果,在资源选择窗口内自行选择传输资源进行通信。假设发送端UE在时隙n触发资源选择,具体的资源选择流程如下:
步骤1:确定资源选择窗[n+T1,n+T2],0≤T1≤T(proc,1)
SL,T2min≤T2≤PDB(数据包的延时),T1和T2的选择基于实现。
步骤2:确定侦听窗[n-T0,n-T(proc,0)
SL)]。
步骤3:确定参考信号接收功率(reference signal received power,RSRP)的门限值,RSRP的门限值和待发送数据的优先级prioTX,和接收到的侧行链路控制信息(sidelink control information,SCI)所指示的优先级prioRX有关,具体为资源池配置的RSRP门限值集合中的第prioRX+(prioTX-1)*8个门限值。
步骤4:初始化可用资源集合SA包括资源选择窗中所有时频资源(以一个时隙和一个子信道为单位)。
步骤5:从SA排除以下时频资源:侦听窗中未侦听的时隙(发送的时隙)所对应的资源池配置的全部周期资源预约的时隙。
如果SA排除的时频资源少于资源选择窗总资源的X%,重新执行步骤4的初始化。
步骤6:继续从SA排除以下时频资源:接收的第一级SCI译码成功,且该接收的第一级SCI所预约的时频资源对应的物理侧行链路共享信道(physical sidelink shared channel,简称PSSCH)上的解调参考信号(demodulation reference signal,DMRS)进行RSRP测量的结果高于步骤3确定RSRP门限,且该接收的第一级SCI所预约的时频资源在资源选择窗内的。
步骤7:如果SA中剩余的资源少于资源选择窗总资源的X%,X%的取值由资源池配置,则通过提升步骤3所确定RSRP门限的方式(示例地,每次提升3),直至满足SA中剩余的资源不小于资源选择窗总资源的X%。
示例地,在SA中随机选择时频资源(r0,r1,r2,…)用于发送数据,在发送之前对(r0,r1,r2,…)进行资源重评估,重评估后,从SA中选择的资源(r0',r1',r2',…)进行抢占检测。资源(r0',r1',r2',…)为逻辑时隙。
用户在至少时隙m-T3(T3=T(proc,1)
SL)时刻进行资源重评估和抢占检测,UE可以基于实现在时隙m-T3前后触发进行资源重评估和/或抢占检测。根据步骤1-7确定(r0,r1,r2,…)和(r0',r1',r2',…)是否需要被排除。
如果(r0,r1,r2,…)和(r0',r1',r2',…)中的ri和/或ri'不属于SA(即ri和ri'分别在重评估和/或抢占检测时被排除),则对ri和/或ri'进行重新选择。其中,时隙m为下一个要发送的
时隙,即时隙m属于(r0,r1,r2,…)和(r0',r1',r2',…)。
6.信道繁忙比率(channel busy ratio,CBR):表示在预设测量周期(如100个时隙或100·2^μ个时隙)内,侧行链路接收信号强度指示(sidelink-received signal strength indicator,S-RSSI)超过预配置的临界值的信道的数量与信道的总数的比例。CBR是衡量干扰程度的指标,CBR越大,表明信道繁忙程度越高,系统负荷越大,不同终端装置之间的干扰越强。若某一信道的S-RSSI大于预配置的临界值,则表明该信道已被占用,若某一信道的S-RSSI小于或等于预配置的临界值,则表明该信道未被占用。CBR测量方式不同,所得到CBR的可以表征不同类型的信道繁忙程度。例如,在100个时隙(或100·2^μ个时隙)的预设测量周期内,若终端装置对物理侧行反馈信道(physical sidelink feedback channel,PSFCH)、PSSCH和物理侧行控制信道(physical sidelink control channel,PSCCH)三种信道进行CBR测量,所获得的CBR表示在预设测量周期内,PSFCH、PSSCH和PSCCH整体的信道繁忙程度。若终端装置对PSFCH进行CBR测量,此时所获得的CBR表示在预设测量周期内,PSFCH一种信道的繁忙程度。若终端装置对PSSCH和PSCCH两种信道进行CBR测量,此时所获得的CBR表示在预设测量周期内,PSSCH和PSCCH整体的信道繁忙程度。其中,“终端装置对不同信道进行CBR测量,获取CBR”的详细流程可参见相关技术,这里不再赘述。在本申请实施例中,μ表示子载波间隔的序号。
7.LBT:LBT机制是一种信道接入规则。UE在接入信道(开始发送数据)之前需要侦听信道是否空闲(idle),如果信道已经保持空闲一定时间,则UE可以占用信道;如果信道非空闲,则UE需要等待信道重新恢复为空闲后才可以占用信道。
一般可以采用基于能量的检测和信号类型的检测来判断信道的状态,比如NR-U采用能量的检测,而WiFi采用两种相结合的检测方法。基于能量的检测需要设定一个检测门限(energy detection threshold),当检测的能量超过检测门限时,判决为信道忙,则不允许接入信道。当检测的能量低于检测门限时,如果持续一段时间后,则允许接入信道。根据国家和地区对于使用非授权频段的法规要求,以5GHz频段为例,接入20MHz的一个信道,需要满足至少最小占用信道带宽(occupied channel bandwidth,OCB)的要求才可以占用信道,一般最小OCB要至少是正常带宽的80%,以正常带宽为20MHz为例,即UE至少需要占用16MHz的带宽才可以抢占该20MHz信道。
LBT有多种类型,以下主要介绍两种:
第一类型LBT:通信设备需要进行随机退避(backoff)后才能接入信道并发送数据。示例地,用户设备可以在一段延续检测(defer sensing)时间(记作Td)中首次侦听到信道为空闲,在检测时隙时段(sensing slot duration)上将计数器N递减为零之后,发起数据传输。紧随Td后的是mp个连续的侦听时隙时段(记作Tsl)。具体地,用户设备可以根据以下步骤接入信道:
步骤1:设置N=Ninit,其中Ninit为均匀分布在0和CWp之间的随机数,执行步骤2,其中CWp为优先级为p时的竞争窗口(contention window for a given priority class);
步骤2:如果N>0,网络设备或终端设备选择递减计数器,取N=N-1;
步骤3:如果侦听时隙期间的信道是空闲的,则转至步骤4;
否则,转至步骤5;
步骤4:如果N=0,停止;
否则,执行步骤2。
步骤5:侦听信道,直到在另一个Td内侦听到信道繁忙或侦听到另一个Td内所有侦听时隙都被检测为信道空闲;
步骤6:如果在另一个Td内的侦听时隙都被检测为信道空闲,则执行步骤4;
否则,执行步骤5。
其中,CWmin,p≤CWp≤CWmax,p,CWmin,p为优先级为p时的竞争窗口的最小取值,CWmax,p为优先级为p时的竞争窗口的最大取值。
在上述步骤1之前选择CWmin,p和CWmax,p,mp、CWmin,p和CWmax,p是基于与网络设备或终端设备传输相关联的信道接入优先级等级p确定的,如表1所示:
表1信道接入优先级与CWp的关系表
表1中Tm cot,p为优先级为p时的信道占用最大时长(maximum channel occupancy time for a given priority class),网络设备或终端设备在信道上传输的信道占用时间(channel occupancy time,COT)不超过Tm cot,p,换句话说,COT指通信设备在成功接入信道后允许占用信道的时间,再换句话说,通信设备完成LBT过程可以抢占一段时间内该信道的使用权。信道接入过程是基于与网络设备或终端设备传输相关联的信道接入优先级等级p执行的,表1中的优先级等级数值越小,表示优先级越高,比如优先级1为最高优先级。
网络设备或终端设备维护竞争窗口值CWp,并在步骤1之前根据以下步骤调整CWp的取值:
对于表中的每个优先级,设置该优先级对应的CWp=CWmin,p。
网络设备或终端设备在参考子帧k中发送的数据所对应的混合自动重传请求肯定应答(hybrid automatic repeat request acknowledgment,HARQ-ACK)HARQ-ACK值中,如果至少80%的数据被反馈否定应答(negative acknowledgment,NACK),则将每个优先级所对应的CWp值增加到下一个较高的允许值,在步骤2中使用;否则,执行步骤1。其中,参考子帧k是网络设备或终端设备在信道上最近一次数据传输的起始子帧。
如图3所示,以N为6为例,以N为6为例,用户设备通过侦听确定信道在第一个Td的时长范围内一直为空闲状态,在第一个Tsl中将N从6递减为5,在第二个Tsl中将N从5递减为4,用户设备侦听到信道状态为繁忙,等待信道状态为空闲且持续Td的时长后,在第三个Tsl中将N递减为3。用户设备又侦听到信道繁忙,重新等待信道状态为空闲且持续Td的时长后,在第四个Tsl中将N递减为2,第五个Tsl中将N递减为1,在第六个Tsl中将N递减为0。用户设备接入信道,在COT内传输数据。
第二类型LBT为无随机退避的LBT,分为两种情况:
情况A:通信设备在侦听到信道处于空闲状态并持续一段时间后,不进行随机退避就可以进行数据发送。
情况B:在短暂的转换间隔(switching gap)后立即发送,比如,通信设备在COT中由接收状态到发送状态的转换间隔后立即进行发送,转换间隔的时间不大于16us。
如图4所示,UE侦听信道,确定该信道在时间间隔(gap)内状态为空闲,则在该时间间隔的结束时刻可以接入信道。
用于UE执行LBT过程的时域资源包括一个或多个侦听时间单元,比如,一个侦听时间单元为9us。UE在侦听时间单元中可以侦听信道,同时进行随机退避。值得注意的是,侦听时间单元长度与UE用于发送数据的时域资源的时间单元长度不同。示例地,以时隙为UE用于发送数据的时域资源包括的时间单元的一个示例,时间单元的长度可以是:当子载波间隔为15kHZ时,时间单元长度为1ms;当子载波间隔为30kHZ时,时间单元长度为0.5ms,等等。
在非授权SL系统中,用户设备基于LBT自主竞争传输资源,急需发送数据的UE可能无法竞争到传输资源。比如,UE1的数据优先级更高,但是传输资源可能被其他UE抢占。示例地,按照LBT规则,UE1随机退避过程未完成,但是其他UE的随机退避过程先于UE1完成,这样,其他UE就可以先接入信道,这种情况下UE1无法再接入该信道,只能等待其他UE数据传输结束后再基于LBT重新尝试接入信道。这样无法满足SL在非授权频段不同业务的服务质量(quality of service,QoS)需求,比如,UE1待发送数据的时延要求较为严格,但是UE1无法竞争到资源,导致该数据无法及时发送,严重影响用户体验。
为了解决上述问题,本申请实施例提出一种通信方法,该方法能够使得数据及时发送,满足业务需求。如图5所示,该方法可以包括以下步骤:
步骤501:第一终端装置接收来自第二终端装置的第一指示信息。
该第一指示信息用于指示第一资源,第一资源为第二终端装置预约的用于发送第一数据的资源。第一资源在时域上对应第一COT。第一资源也可以称为第二终端装置预约的资源,或者,预约的COT。
第一指示信息可以承载于第一级侧行链路控制信息SCI,或者,第二级SCI,或者,侧行链路媒体接入控制控制元素(sidelink media access control controlelement,SL-MAC CE),或者,PC5接口无线资源控制(PC5radio resource control,PC5-RRC)信令中的至少一个。示例地,第一指示信息可以只承载于上述信令中的一个。第一指示信息也可以承载于上述信令中的多个,比如,第一指示信息的完整内容可以承载在SL-MAC CE中,也承载在PC5-RRC中等等。又或者,第一指示信息的内容可以通过多个信令共同指示,示例地,第一指示信息的一部分内容承载在第一级SCI中,另一部分内容承载在PC5-RRC中,等等,本申请实施例对此不做限定。
应理解,第一指示信息也可以承载于其他网络配置的信令,或预配置的信令中。比如周期性资源预约指示(resource reservation period)字段用于指示周期预约传输数据的资源,周期性资源预约指示字段的取值可以是网络设备配置的,或预配置的,或预定义的。示例地,网络设备可以通过RRC信令指示周期性资源,RRC信令中包括周期信息
(sl-ResourceReservePeriod1)。本申请实施例对此不做限定。
以第一指示信息承载于第一级SCI为例,第一级SCI中的频域资源指示(frequency resource assignment)字段和时域资源指示(time resource assignment)字段分别用于指示第一用户设备传输数据的频域资源和时域资源。第二终端设备译码该第一级SCI后,可以确定第一资源。
第一指示信息可以指示第二终端装置的LBT时频起始位置,其中,LBT时频起始位置可以理解为第二终端装置用于执行LBT的时频资源的起始位置;或者,第一指示信息可以指示第二终端装置预约的COT的时频起始位置。
当第一指示信息用于指示第二终端装置的LBT时频起始位置时,第二终端装置还需要向第一终端装置指示LBT参数,第一终端装置根据该LBT参数确定第一资源。应理解,该LBT参数为第二终端装置的LBT参数。其中,第二终端装置的LBT参数可以包括LBT计数器,比如总回退次数Ninit和当前计数器的取值N,该LBT参数还可以包括LBT信道接入优先级p。
该LBT参数可以承载于第二级SCI,比如,可以由SCI format 2-D承载。第二级SCI的格式可以通过第一级SCI指示,第二级SCI可能的格式字段如表2所示:
表2第二级SCI的格式字段
应理解,表2只作为一种示例而非限定。表2可以以其部分内容实施,也可以以其全部内容作为实施,又或者,表2可以作为其他内容的一部分作为实施,本申请实施例对此不做限定。
可选地,第二终端装置可以向第一终端装置发送指示信息(即第三指示信息),该指示信息用于指示第一终端装置为第二终端装置发送数据的目的端。示例地,该指示信息可以包括待发送数据的源端和目的端的身份标识(identity document,ID),其中,源端的ID(source ID)为第二终端装置的ID,目的端的ID(destination ID)为第一终端装置的ID。或者,该指示信息可以包括第二终端装置的ID。或者,该指示信息中可以包括第二终端装置的ID和第一终端装置的ID。第一终端装置接收到该指示信息后,即可确定自己与第二终端装置为数据传输的双方。
或者,该指示信息中可以包括临时用户组标识(temporary UE group ID,以下简称组ID),该组为网络设备预定义的组,比如,网络设备将UE1和UE2划分到同一个组。又或者,该指示信息中可以包括小区ID,该小区可以是UE1和UE2共处的地理意义上的小区,该小区可以是根据网络设备的调度范围划分的小区,该小区也可以是网络设备预定义
的小区。第一终端装置还需要从网络设备接收相同内容的指示信息。示例地,第一终端装置从网络设备接收组ID,再从第二终端装置接收相同的组ID,即可确定自己与第二终端装置为同组ID,网络设备可以预定义该临时组中包括的ID为数据传输双发的ID,则第一终端装置即可确定自己与第二终端装置为数据传输的双方。
又或者,网络设备可以预配置第一终端装置和第二终端装置的对应关系。示例地,网络设备可以将第一终端装置潜在的交互对端与第一终端装置的对应关系表格预配置在第一终端装置中,当第一终端装置接收到第二终端装置发来的ID时,可以确定第二终端装置为与自己交互的对端。
上述第三指示信息可以承载于第一级SCI,或者,第二级SCI,或者,SL-MAC CE,或者,PC5-RRC信令中的至少一个。应理解,上述指示数据传输双方的方式仅为示例而非限定。第三指示信息的承载方式可以参考第一指示信息的相关说明,不再赘述。
第二终端装置还要向第一终端装置发送数据优先级指示信息(即第四指示信息),用于指示第二终端装置的待发送数据的优先级。该优先级指示信息可以承载于第一级SCI,或者,第二级SCI,或者,SL-MAC CE,或者,PC5-RRC信令中的至少一个。第四指示信息的承载方式可以参考第一指示信息的相关说明,不再赘述。
应理解,上述第一指示信息和第四指示信息可以以广播的形式发送,也可以以组播的形式发送,也可以以单播的形式发送。本申请实施例对此不做限定。
步骤502:第一终端装置根据第一指示信息确定第二资源。
第一终端装置可以根据第一指示信息指示的第一资源确定第二资源。示例地,第一终端装置根据第一资源在时域上的位置确定第二资源。具体地,第一终端装置确定一部分资源,该资源的在时域上在第一资源在时域上的位置之后,且不与第一资源重叠,则该部分资源可以为第二资源。
可选地,第一终端装置还可以在第一侦听时间单元侦听第一信道状态为空闲,根据第一资源在第一侦听时间单元中止先听后说过程,该第一侦听时间单元在第一资源的起始时间单元之前。
其中,第一终端装置根据第一资源在第一侦听时间单元中止先听后说过程,可以理解为,第一终端装置确定第一资源后,根据第一资源的时域位置在第一侦听时间单元中止先听后说过程。
例如,当第一终端装置接收到LBT时频起始位置和LBT参数信息时,第一终端装置需要根据LBT时频起始位置和LBT参数信息确定第一资源的时频位置。示例地,第一终端装置根据LBT总回退次数Ninit和当前计数器的取值N,计算第二终端装置中计数器从N递减为0所需要的时长,再根据LBT时频起始位置和该时长就可以确定出LBT结束时的时频位置,该LBT结束时的时频位置就是第一资源的起始位置(起始时间单元)。
第一终端装置中止先听后说过程,可以理解为第一终端装置停止或者暂时停止接入信道的过程,换句话说,第一终端装置在第一资源对应的时域范围内不接入信道,又或者,可以是第一终端装置中止递减计数器的取值,比如,将计数器的取值从Q递减为M后,中止递减,其中1≤M≤Q,Q为计数器的初始取值。
第一终端装置在中止先听后说过程前,还需要确定以下内容中的至少一项:
A.第二终端装置待发送数据的优先级高于第一终端装置待发送数据的优先级。
第一终端装置可以根据步骤501中的第四指示信息和自身的数据优先级确定优先级的关系。
B.第二终端装置发送的参考信号的RSRP高于第一终端装置确定的RSRP门限。
根据LBT规则,第一终端装置抢占信道后会根据其发送信号强度静默一定RSRP门限范围内的UE,这些UE会因为检测到信道繁忙而无法完成LBT回退过程。若某一个UE的RSRP较低,则表示该UE与第一终端装置的距离较远。第一终端装置在将资源分享给第二终端装置后,第二终端装置较低的RSRP无法静默第一终端装置附近的其他设备,导致信道可能被其他设备占用。因此,第二终端装置发送的参考信号的RSRP高于第一终端装置确定的RSRP门限时,可以正常发送数据。
其中,第二终端装置可以向第一终端装置发送参考信号,示例地,该参考信号可以承载于第一级SCI,比如,该参考信号可以是PSCCH DMRS。该参考信号也可以是PSSCH的参考信号,例如PSSCH DMRS。第一终端装置通过测量该第一级SCI,得到该参考信号的接收功率。RSRP门限的确定可以参考SL mode 2中的相关说明,不再赘述。
C.第一资源的起始时间单元在第一终端装置即将抢占的资源的起始时间单元之后。
该第一终端装置即将抢占的资源可以理解为,第一终端装置如果按照当前LBT过程完成退避后,将要占用的时频资源。如图6中的(a)所示,第一终端装置即将抢占的资源为TUE1S至TUE1E之间的时频资源。
D.第一资源的起始时间单元与计数器取值为M的第一个侦听时间单元之间的时长小于或等于第一阈值,其中,1≤M≤N,N为中止计数器递减时计数器的取值。
第一阈值可以大于0,同时小于第一终端装置待发送数据所要求的时延。换句话说,第一终端装置中止递减计数器所持续的时长存在上限。也就是说,第一终端装置判断,如果中止持续时间小于或等于该上限时,就可以执行中止,无需考虑中止时计数器的取值。再换句话说,第一终端装置确定执行中止的时刻,可以是满足上限时的计数器的取值大于0的任何时刻。该第一阈值可以是网络设备配置的取值,或者预配置的取值,或者标准协议预定义的固定取值,本申请实施例对此不做限定。
第一终端装置中止递减计数器,可以理解为第一终端装置从某一时刻开始不再递减计数器,计数器的数值维持中止前的数值不再发生变化。而且限定计数器的数值最小维持在1,根据LBT的规则,这意味着第一终端装置将无法接入信道发送数据。
计数器取值为M的第一个侦听时间单元,指的是开始中止的时刻所在的侦听时间单元(即第一侦听时间单元)。示例地,在侦听时间单元1中止递减,此时计数器取值为2,在第一资源的起始单元之前,还包括侦听时间单元2和侦听时间单元3,在侦听时间单元2和侦听时间单元3中计数器的取值一直为2,则计数器取值为2的第一个侦听时间单元为侦听时间单元1。应理解,上述数值和索引仅为示例而非限定。
应理解,第一终端装置还需要成功译码第一级SCI。
可选地,第一终端装置还可以根据第三指示信息确定第二终端装置为第一终端装置发送信息(数据)的目的端。
可选地,第一终端装置还可以确定第一信道的CBR。当CBR小于或等于第三阈值时,第一终端装置可以中止LBT过程。其中,CBR表示在第一预设时长内第一信道的繁忙程度。示例性的,第一预设时长可以是预设的测量周期,比如100个时隙,或者100个Tsl,
或者100个Td(或100*2μ个时隙/Tsl/Td)。
又或者,第一终端装置可以在预设测量周期中,如100个Tsl(Td)或100*2μ个Tsl(Td)内,确定能量检测结果大于能量检测阈值的Tsl(Td)数量占Tsl(Td)的总数的比例,该能量检测阈值可以是XThresh。若某一信道或Tsl(Td)能量检测结果大于能量检测阈值,则表明该信道或Tsl(Td)已被占用,若某一信道的能量检测结果小于或等于能量检测阈值,则表明该信道或Tsl(Td)未被占用。当该比例小于或等于第三阈值时,第一终端装置可以中止LBT过程。
上述第三阈值可以是预定义的。示例地,第三阈值可以是20%。本申请实施例对此不做限定。应理解,上述第一预设时长或者预设测量周期在时域上在,第一终端装置中止LBT的时刻所在的时隙,之前。
可选地,第一终端装置还可以对资源进行重评估或抢占检测。示例地,第一终端装置可以在侦听窗之后,在第二终端装置接入信道之前的时域资源上进行重评估或抢占检测。比如,第一终端装置确定,(r0,r1,r2,…)和(r0',r1',r2',…)中的ri和/或ri'不属于SA(即ri和ri'分别在重评估和/或抢占检测时被排除),则可以确定ri和/或ri'可以用于第二终端装置发送数据。其中,第一终端装置重评估或抢占检测之前,可以确定侦听窗、选择窗、参考信号接收功率的门限和初始化可用资源集合,具体的,可以参考SL mode 2中的步骤1-4的描述,不再赘述。
上述信道可以理解为带宽,示例地,在非授权SL通信系统中,存在多个带宽为20MHz的接入信道,UE可以分别在各个20MHz信道内进行LBT接入,且各个信道的接入过程相互独立,UE在完成LBT之后占用对应的20MHz带宽。应理解,20MHz仅为本申请实施例中信道的一种示例而非限定,比如,本申请实施例中的信道还可以是30MHz、40MH或者45MHz等其他带宽。
步骤503:第一终端装置在第二资源上发送数据。
其中,第二资源的起始时间单元在第一资源的结束时间单元之后。如图6中的(b)所示,T*UE1S在TUE2E之后。也就是说,第一终端装置等待第二终端装置数据发送结束后再接入信道发送数据。可以理解为第一终端装置延迟(defer)信道接入,或者,避让第二终端装置预约的资源。
步骤502中的第一阈值可以根据第二资源的时长确定。示例地,第一阈值可以是第二资源的时长的1/10,或者1/8,等等。
第一终端装置接入第二资源的一种可能的实现:第一终端装置在第二侦听时间单元确定信道状态为空闲,继续递减计数器,第二侦听时间单元在第一资源的结束时间单元之后,第一终端装置在第二资源的起始时间单元将计数器递减至0,接入信道发送数据。
其中,继续递减计数器,指的是此次递减开始时计数器的取值为,步骤502中递减中止时计数器的取值。示例地,步骤502中递减中止时计数器的取值为2,此次从计数器取值从2开始递减至0。应理解,该取值仅为示例而非限定。根据LBT规则,计数器递减至0意味着第一终端接入信道发送数据。
又或者,第一终端装置可以确定该信道在一个时间段内状态为空闲,第一终端装置接入该信道,该时间段的时长可以是16us等,具体的,可以参考第二类型先听后说的说明,不再赘述。
可选地,第一终端装置还可以在第一资源的起始时间单元进行侦听,判断第二终端装置是否成功接入信道,若第二终端装置接入成功,第一终端装置按照步骤503的方式接入信道发送数据;否则,第一终端装置直接继续LBT过程,在LBT完成后接入信道。
应理解,第一终端装置在第一信道上发送数据,可以理解为第一终端装置在第一信道上的侧行传输的一个示例。第一终端装置还可以在第一信道上发送或者接收侧行控制信息和/或反馈信息等等。
该方法中,可能抢占资源的设备在时域上通过避让,使数据优先级更高的设备能够在预约的资源上及时发送数据,满足了业务需求,显著提升了用户体验。
本申请实施例提出一种通信方法,如图7所示,以第一指示信息和第四指示信息承载于第一级SCI为例,以UE1为第一终端装置的一个示例,以UE2为第二终端装置的一个示例,以COT1为第一资源的一个示例,以COT2为第二资源的一个示例,以SCI#A为第一级SCI的一个示例,以SCI#B为第二级SCI的一个示例,该方法可以包括以下步骤:
步骤701:UE2向UE1发送SCI#A,对应地,UE1接收SCI#A。
SCI#A承载于PSCCH。其中,SCI#A包括资源指示信息、数据优先级信息、参考信号和SCI#B的格式。具体地,可以参考步骤501中关于第一指示信息和第四指示信息的相关说明,不再赘述。
步骤702:UE2向UE1发送SCI#B,对应地,UE1接收SCI#B。
SCI#B承载于PSSCH。SCI#B包括UE2的LBT参数。
步骤703:UE1根据SCI#A和SCI#B确定COT1。
步骤704:UE1判断满足避让条件。
其中,避让条件可以参考步骤502中的A、B、C和D的相关说明,不再赘述。
可选地,UE1可以进行资源重评估或抢占检测,具体可以参考步骤502中的描述,不再赘述。
步骤705:UE1在侦听时间单元#A中止递减计数器。
示例地,中止递减时计数器的取值为3。步骤703可以参考步骤502中的相关说明,不再赘述。
步骤706:UE2在COT1的起始时间单元接入信道。
步骤707:UE1在COT1的起始时间单元侦听,确定信道状态为繁忙。
步骤708:UE1在侦听时间单元#B确定信道状态为空闲,继续递减计数器,在COT2的起始时间单元上将计数器递减为0。
示例地,UE1从3开始递减计数器。步骤707可以参考步骤503中的相关说明,不再赘述。
步骤709:UE1在COT2上发送数据。
应理解,UE1在步骤701之前可以确定侦听窗和选择窗,以选择资源,这里不展开陈述,具体步骤可以参考上文模式2(SL mode 2)中步骤1至7的说明。
该方法中在满足避让条件时,UE1中止LBT回退过程,不接入信道,等待UE2接入信道发送数据,在UE2数据发送结束后UE1再接入信道发送数据。这样,UE2的数据能够得到及时发送,满足了业务需求。
以上方法中,可能抢占资源的设备执行避让,实现了优先级更高的数据的及时发送,
本申请实施例提出又一种通信方法,通过已抢占资源的设备向待发送数据的设备分享资源,以实现数据的正常发送,下面详细陈述。如图8所示,该方法可以包括以下步骤:
步骤801:第一终端装置接收来自第二终端装置的第一指示信息。
该第一指示信息用于指示第一资源,第一资源为第二终端装置预约的用于发送第一数据的资源。该第一指示信息可以参考步骤501中关于第一指示信息和第一资源的说明,此处不再赘述。
第一终端装置和第二终端装置的关系可以分为两种情况:
情况1:第一终端装置为第二终端装置发送数据的目的端。
这种情况下,第二终端装置需要向第一终端装置发送指示信息(即第三指示信息),该指示信息用于指示第一终端装置为第二终端装置发送数据的目的端。示例地,该指示信息可以包括待发送数据的源端和目的端的身份标识(identity document,ID),其中,源端的ID(source ID)为第二终端装置的ID,目的端的ID(destination ID)为第一终端装置的ID。或者,该指示信息可以包括第二终端装置的ID。或者,该指示信息中可以包括第二终端装置的ID和第一终端装置的ID。第一终端装置接收到该指示信息后,即可确定自己与第二终端装置为数据传输的双方。
或者,该指示信息中可以包括临时用户组标识(temporary UE group ID,以下简称组ID),该组为网络设备预定义的组,比如,网络设备将UE1和UE2划分到同一个组。又或者,该指示信息中可以包括小区ID,该小区可以是UE1和UE2共处的地理意义上的小区,该小区可以是根据网络设备的调度范围划分的小区,该小区也可以是网络设备预定义的小区。第一终端装置还需要从网络设备接收相同内容的指示信息。示例地,第一终端装置从网络设备接收组ID,再从第二终端装置接收相同的组ID,即可确定自己与第二终端装置为同组ID,网络设备可以预定义该临时组中包括的ID为数据传输双发的ID,则第一终端装置即可确定自己与第二终端装置为数据传输的双方。
又或者,网络设备可以预配置第一终端装置和第二终端装置的对应关系。示例地,网络设备可以将第一终端装置潜在的交互对端与第一终端装置的对应关系表格预配置在第一终端装置中,当第一终端装置接收到第二终端装置发来的ID时,可以确定第二终端装置为与自己交互的对端。
上述第三指示信息可以承载于第一级SCI,或者,第二级SCI,或者,SL-MAC CE,或者,PC5-RRC信令中的至少一个,该第二级SCI可以参考步骤501中的相关说明。应理解,上述指示数据传输双方的方式仅为示例而非限定。
情况2:第一终端装置与第二终端装置不是数据传输的双方。
这种情况下,第一终端装置无需确定第二终端装置是否为数据传输的对方。可选地,第一终端装置可以从第二终端装置接收数据优先级指示信息(即第四指示信息),第一终端装置确定所述第二终端装置发送的数据的优先级高于或等于第一终端装置发送的数据的优先级。具体的,第四指示信息可以参考步骤501中的相关描述,不再赘述。
可选地,第一终端装置还从第二终端装置接收参考信号,第一终端装置确定接收该参考信号的功率大于或等于参考信号接收功率阈值。具体地,可以参考步骤502中内容B的相关说明,不再赘述。
步骤802:第一终端装置根据第一资源和第一信道占用时间确定第三资源。
其中,第一信道占用时间(COT)为第五资源在时域上对应的时域资源,第五资源为第一终端装置抢占的资源。比如,第一终端装置在第二终端装置之前接入信道(发送数据),则第一终端装置可以被允许占用的信道使用时长为第一信道占用时间,在该第一COT时长内,第一终端装置可以通过时频资源(第五资源)发送数据。也可以说,第一终端装置根据第一资源和第五资源确定第三资源。
上述第三资源用于第二终端装置发送数据,该第三资源属于第一资源和第一信道占用时间。由于第一信道占用时间的起始时刻(起始时间单元)在第一资源的起始时刻(起始时间单元)之前,第三资源属于第一资源和第一信道占用时间可以理解为,第三资源属于第一资源和第一信道占用时间的交集,或者,重叠部分。也可以说,第三资源属于第一资源和第五资源重叠的部分。可以理解的是,第三资源可以是第一资源和第一信道占用时间的重叠部分,即第三资源在时域上对应的资源为第一资源在时域上对应的资源与第一信道占用时间的交集。第三资源也可以是第一资源和第一信道占用时间的重叠部分的一部分,即第三资源在时域上对应的资源在第一资源在时域上对应的资源与第一信道占用时间的交集的范围之内。
可选地,第一终端装置在确定第三资源后,向第二终端装置发送第二指示信息,第二指示信息用于指示第三资源。进一步地,第一终端装置在第一时段向第二终端装置发送第二指示信息,该第一时段的起始时刻在该第四资源的起始时间单元与该第三资源的起始时间单元范围内,且该第一时段的起始时刻与该第四资源的起始时间单元之间的时长大于或等于第二阈值。示例地,该第二阈值可以是Tproc,0也就是说,第一终端装置需要在第三资源的起始时间单元之前,将第三资源的信息指示给第二终端装置。
也就是说,在步骤801的情况1中,第一终端装置需要确定以下内容中的至少一项:
E:第一终端装置为第二终端装置预约资源传输的目的端。
F:第一资源的起始位置在第五资源的起始位置之后,且第一资源与第五资源有重叠。
G:第一终端装置有足够的时间用于发送第二指示信息。
在步骤801的情况2中,第一终端装置需要确定以下内容中的至少一项:
H:第二终端装置待发送数据的优先级高于第一终端装置待发送数据的优先级。
I:第一资源的起始位置在第五资源的起始位置之后,且第一资源与第五资源有重叠。
J:第一终端装置有足够的时间用于发送第二指示信息。
K:第一资源的RSRP高于RSRP门限。
应理解,第一终端装置还需要成功译码第一级SCI。
根据LBT规则,第一终端装置抢占信道后会根据其发送信号强度静默一定RSRP门限范围内的UE,这些UE会因为检测到信道繁忙而无法完成LBT回退过程。若某一个UE的RSRP较低,则表示该UE与第一终端装置的距离较远。第一终端装置在将资源分享给第二终端装置后,第二终端装置较低的RSRP无法静默第一终端装置附近的其他设备,导致信道可能被其他设备占用,这样,第二终端装置无法发送数据,第一终端装置也无法重新接入该信道。因此,第二终端装置发送的参考信号的RSRP高于第一终端装置确定的RSRP门限时,可以正常发送数据。具体地,可以参考步骤502中的内容B,不再赘述。
可选地,第一终端装置可以进行资源重评估或抢占检测,具体可以参考步骤502中的描述,不再赘述。
上述第二指示信息可以承载于第一级SCI,或者,第二级SCI,或者,SL-MAC CE,或者,PC5-RRC信令中的至少一个。具体地,第二指示信息的承载方式可以参考第一指示信息的相关说明,不再赘述。
步骤803:第一终端装置在第四资源上发送数据,第四资源属于第一信道占用时间内除第三资源以外的资源。
可以理解为,第四资源属于第五资源中除第三资源以外的资源,意味着,第四资源可以是第五资源中除第三资源以外的全部资源,或者,第四资源可以是第五资源中除第三资源以外的资源中的一部分。
还可以理解的是,第三资源的起始时刻(起始时间单元)在第五资源的起始时刻之后,意味着第一终端装置在第三资源之前的资源上已经发送了一部分数据。第二终端装置在第三资源上数据发送完成,第一终端装置重新接入信道,在第三资源之后的资源上发送数据。在第一终端装置接入信道之前,可以对该信道进行侦听,比如,确定该信道在一个时间段内为空闲状态,则可以接入该信道,具体的,可以参考第二类型先听后说的说明,不再赘述。又或者,第一终端装置可以在一个时间段内根据第一类型先听后说接入信道,本申请实施例对此不做限定。
一种可能的实现,第四资源属于第一信道占用时间内除第三资源以外的资源可以理解为,在第一信道占用时间内,除第三资源对应的频域资源以外的频域资源,也就是说,第一终端装置和第二终端装置在第三资源对应的时域资源上同时发送数据,但是第一终端装置和第二终端装置发送数据使用的频域资源不重叠。
该方法中,已抢占资源的设备将资源分享给数据优先级更高的设备,或者分享给与自己为数据传输的发送端的设备,能够使优先级更高的设备及时发送数据,满足了业务需求,提升了用户体验。
本申请实施例提出一种通信方法,如图9所示,以第一指示信息、第三指示信息和第四指示信息承载于第一级SCI为例,以UE1为第一终端装置的一个示例,以UE2为第二终端装置的一个示例,以COT1为第一资源的一个示例,以COT3为第三资源的一个示例,以COT4为第四资源的一个示例,以COT5为第五资源的一个示例,以SCI#C为第一级SCI的一个示例,以SCI#D为第二级SCI的一个示例,应理解,一个COT的时长中包括用于发送PSCCH和PSSCH的时长。该方法可以包括以下步骤:
步骤901:UE2向UE1发送SCI#C,对应地,UE1接收SCI#C。
SCI#C承载于PSCCH。该SCI#C为第一级SCI。其中,SCI#C包括资源指示信息、参考信号和SCI#D的格式。具体地,资源指示信息可以参考步骤801中关于第一指示信息的相关说明,参考信号SCI#D的格式可以参考步骤801中的相关说明,不再赘述。
可选地,当UE2与UE1不是该次数据传输双方时,SCI#C中可以包括UE2待发送数据的优先级。
步骤902:UE2向UE1发送SCI#D,对应地,UE1接收SCI#D。
SCI#D承载于PSSCH。该SCI#D为第二级SCI。SCI#D包括UE2的LBT参数。
当UE2与UE1是该次数据传输双方时,SCI#D还包括UE2的ID和UE1的ID。这些ID可以参考步骤801中第三指示信息的说明,该SCI#D可以参考步骤501中的第二级SCI的说明,不再赘述。
当UE2与UE1不是该次数据传输双方时,SCI#D中可以不包括UE2的ID和UE1的ID。
可选地,UE1可以进行资源重评估或抢占检测,例如,UE1可以在T1-Tproc,1
SL进行资源重评估或抢占检测。具体可以参考步骤502中的描述,不再赘述。
步骤903:UE1在COT5上发送数据。
如图10所示,UE1在T1接入信道(发送数据)。图10中T1至T2之间的资源为步骤802中的第五资源。
步骤904:UE1根据SCI#C和SCI#D确定COT1。
如图10所示,COT1为T3至T4之间的时长。具体的,COT1可以参考步骤802中第一资源的说明,不再赘述。也就是说T3至T4之间的资源为步骤801中的第一资源。
步骤905:UE1判断满足避让条件。
其中,当UE2与UE1是该次数据传输双方时,避让条件可以参考步骤802中的E、F和G的相关说明,当UE2与UE1不是该次数据传输双方时,避让条件可以参考步骤802中的H、I、J和K的相关说明,不再赘述。
步骤906:UE1向UE2发送第二指示信息。
如图10所示,UE1在T5至T6之间向UE2发送第二指示信息。该第二指示信息用于指示COT3,比如,第二指示信息可以包括COT3的起始位置T8和COT的长度L。或者,第二指示信息可以包括COT3的起始位置T8和结束位置T9。
步骤907:UE1在T7停止发送数据。
步骤908:UE2确定在T7至T8之间信道状态为空闲。
可选地,UE2可以根据第二类型先听后说机制确定在T7至T8之间信道状态为空闲。
步骤909:UE2在T8开始发送数据。
如图10所示,UE2在T8至T9之间发送数据。也就是说T8至T9之间的资源为步骤802中的第三资源。
步骤910:UE1确定在T9至T10之间信道状态为空闲。
可选地,UE1可以根据第二类型先听后说机制确定在T9至T10之间信道状态为空闲。
步骤911:UE1在T10开始发送数据。
可选地,如图10所示,UE1可以在T2结束发送数据,也就是说T1至T7和T10至T2之间的资源为步骤803中的第四资源。
应理解,UE1在步骤901之前可以确定侦听窗和选择窗,以选择资源(COT5),这里不展开陈述,具体步骤可以参考上文模式2(SL mode 2)中步骤1至7的说明。还应理解,图10旨在说明时域上的关系,图中的多个COT分开绘制仅是为了清楚起见,不涉及频域上的区分。
该方法中,已经抢占了资源的UE1作为UE2的接收端,或者,当UE2的数据优先级高于UE1的数据优先级时,UE1将抢占的资源中的一部分或者全部分享给UE2,以使UE2能够及时发送数据,满足了业务需求,提高了通信效率。
上述图5至图10所示的方法中,第一终端装置抢占的资源与第二终端装置预约的资源在同一信道内,可以理解的是,第一终端装置抢占的资源与第二终端装置预约的资源也可以在不同的信道,又或者,第二终端装置预约的资源中的一部分频域资源与第一终端装
置抢占的资源所在的信道相同,另一部分频域资源与第一终端装置抢占的资源所在的信道不同。本申请对此不做限定。
本申请实施例提出一种通信方法,如图11所示,以第一指示信息和第四指示信息承载于第一级SCI为例,以UE1为第一终端装置的一个示例,以UE2为第二终端装置的一个示例,以COT1为第一资源的一个示例,以COT2为第二资源的一个示例,以SCI#E为第一级SCI的一个示例,以SCI#F为第二级SCI的一个示例,该方法可以包括以下步骤:
步骤1101:UE2向UE1发送SCI#E,对应地,UE1接收SCI#E。
SCI#E承载于PSCCH。其中,SCI#E包括资源指示信息、数据优先级信息、参考信号和SCI#F的格式。具体地,可以参考步骤501中关于第一指示信息和第四指示信息的相关说明,不再赘述。
步骤1102:UE2向UE1发送SCI#F,对应地,UE1接收SCI#F。
SCI#F承载于PSSCH。SCI#F包括UE2的LBT参数。
步骤1103:UE1根据SCI#E和SCI#F确定第一资源。
如图12所示,第一资源为信道#3上在COT1范围内的时频资源,T1与T2之间为COT1的时间长度。
步骤1104:判断满足避让条件。
在该步骤中的避让条件除了步骤502中的A、B、C和D以外,还包括:UE1剩余可用信道数量等于或者超过门限T’th。其中,剩余可用信道数量可以是UE1占用的信道中除UE2预约的资源所在的信道以外的信道,门限T’th可以由UE1占用的总信道数量确定。示例地,如图12所示,UE1抢占了三个信道,分别为信道#1、信道#2和信道#3,假设UE2预约的资源在信道#1上,上述门限T’th为1,UE1剩余可用信道数量为2,大于门限,则UE1可以将信道#1避让出来,用于UE2发送数据,信道#2和信道#3可以用于UE1发送数据。
可选地,UE1可以进行资源重评估或抢占检测,具体可以参考步骤502中的描述,不再赘述。
步骤1105:UE1在信道#2和信道#3上发送数据。
具体的,如图12所示,UE1在信道#2和信道#3上在COT2范围内的时频资源上发送数据,T3与T4之间为COT2的时间长度。
步骤1106:UE2在信道#1上发送数据。
具体的,UE2在信道#1上在COT1范围内的时频资源上发送数据。
该方法中,UE1抢占多个信道,当UE2预约的资源处于UE1抢占的多个信道中的一个信道上时,UE1可以让出这个信道,通过其余的可用信道发送数据,该信道用于UE2发送数据,能够使得UE2的数据及时发送,满足业务需求,提高通信效率。
本文中描述的各个实施例可以为独立的方案,也可以根据内在逻辑进行组合,这些方案都落入本申请的保护范围中。应理解,上述实施例的步骤只是为了清楚描述实施例的技术方案,不对步骤执行的先后顺序做限定。
上述本申请提供的实施例中,分别从各个设备之间交互的角度对本申请实施例提供的方法进行了介绍。为了实现上述本申请实施例提供的方法中的各功能,网络设备或终端设备可以包括硬件结构和/或软件模块,以硬件结构、软件模块、或硬件结构加软件模块的
形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行,取决于技术方案的特定应用和设计约束条件。
本申请实施例中对模块的划分是示意性的,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式。另外,在本申请各个实施例中的各功能模块可以集成在一个处理器中,也可以是单独物理存在,也可以两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现,也可以采用软件功能模块的形式实现。
以下,结合图13至图14详细说明本申请实施例提供的通信装置。应理解,装置实施例的描述与方法实施例的描述相互对应,因此,未详细描述的内容可以参见上文方法实施例,为了简洁,这里不再赘述。
与上述构思相同,如图13所示,本申请实施例还提供一种装置1300用于实现上述方法中会话管理功能网元的功能。例如,该装置可以为软件模块或者芯片系统。本申请实施例中,芯片系统可以由芯片构成,也可以包含芯片和其他分立器件。该装置1300可以包括:处理单元1310和通信单元1320。
本申请实施例中,通信单元也可以称为收发单元,可以包括发送单元和/或接收单元,分别用于执行上文方法实施例中会话管理功能网元发送和接收的步骤。
通信单元也可以称为收发器、收发机、收发装置等。处理单元也可以称为处理器,处理单板,处理模块、处理装置等。可选的,可以将通信单元1320中用于实现接收功能的器件视为接收单元,将通信单元1320中用于实现发送功能的器件视为发送单元,即通信单元1320包括接收单元和发送单元。通信单元有时也可以称为收发机、收发器、或接口电路等。接收单元有时也可以称为接收机、接收器、或接收电路等。发送单元有时也可以称为发射机、发射器或者发射电路等。
通信装置1300执行上面实施例中5至图11中任一所示的流程中第一终端装置的功能时:
通信单元,可以用于侧行链路控制信息的接收,以及数据的发送。
处理单元可以用于解析侧行链路控制信息,确定传输资源,确定第一信道占用状态,确定是否满足避让条件,和/或,执行LBT过程等。
通信装置1300执行上面实施例中5至图12中任一所示的流程中第二终端装置的功能时:
通信单元,可以用于发送侧行链路控制信息,接收第二指示信息,和/或发送数据。
处理单元,可以用于确定传输资源和/或执行LBT过程等。
以上只是示例,处理单元1310和通信单元1320还可以执行其他功能,更详细的描述可以参考图5至图12所示的方法实施例或其他方法实施例中的相关描述,这里不加赘述。
如图14所示为本申请实施例提供的装置1400,图14所示的装置可以为图14所示的装置的一种硬件电路的实现方式。该通信装置可适用于前面所示出的流程图中,执行上述方法实施例中终端设备或者网络设备的功能。为了便于说明,图14仅示出了该通信装置的主要部件。
通信装置1400可以是终端设备,能够实现本申请实施例提供的方法中第一终端装置或第二终端装置的功能。通信装置1400也可以是能够支持第一终端装置或第二终端装置实现本申请实施例提供的方法中对应的功能的装置。其中,该通信装置1400可以为芯片
系统。本申请实施例中,芯片系统可以由芯片构成,也可以包含芯片和其他分立器件。具体的功能可以参见上述方法实施例中的说明。
通信装置1400包括一个或多个处理器1410,用于实现或用于支持通信装置1400实现本申请实施例提供的方法中第一终端装置或第二终端装置的功能。具体参见方法示例中的详细描述,此处不做赘述。处理器1410也可以称为处理单元或处理模块,可以实现一定的控制功能。处理器1410可以是通用处理器或者专用处理器等。例如,包括:中央处理器,应用处理器,调制解调处理器,图形处理器,图像信号处理器,数字信号处理器,视频编解码处理器,控制器,存储器,和/或神经网络处理器等。所述中央处理器可以用于对通信装置1400进行控制,执行软件程序和/或处理数据。不同的处理器可以是独立的器件,也可以是集成在一个或多个处理器中,例如,集成在一个或多个专用集成电路上。可以理解的是,本申请的实施例中的处理器可以是中央处理单元(central processing unit,CPU),还可以是其它通用处理器、数字信号处理器(digital signal processor,DSP)、专用集成电路(application specific integrated circuit,ASIC)、现场可编程门阵列(field programmable gate array,FPGA)或者其它可编程逻辑器件、晶体管逻辑器件,硬件部件或者其任意组合。通用处理器可以是微处理器,也可以是任何常规的处理器。
可选地,通信装置1400中包括一个或多个存储器1420,用以存储指令1440,所述指令可在所述处理器1410上被运行,使得通信装置1400执行上述方法实施例中描述的方法。存储器1420和处理器1410耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接,可以是电性,机械或其它的形式,用于装置、单元或模块之间的信息交互。处理器1410可能和存储器1420协同操作。所述至少一个存储器中的至少一个可以包括于处理器中。需要说明的是,存储器1420不是必须的,所以在图14中以虚线进行示意。
可选地,所述存储器1420中还可以存储有数据。所述处理器和存储器可以单独设置,也可以集成在一起。在本申请实施例中,存储器1420可以是非易失性存储器,比如硬盘(hard disk drive,HDD)或固态硬盘(solid-state drive,SSD)等,还可以是易失性存储器(volatile memory),例如随机存取存储器(random-access memory,RAM)。本申请的实施例中处理器还可以是闪存、只读存储器(read-only memory,ROM)、可编程只读存储器(programmable ROM,PROM)、可擦除可编程只读存储器(erasable PROM,EPROM)、电可擦除可编程只读存储器(electrically EPROM,EEPROM)、寄存器、硬盘、移动硬盘、CD-ROM或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器,从而使处理器能够从该存储介质读取信息,且可向该存储介质写入信息。当然,存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外,该ASIC可以位于网络设备或终端设备中。当然,处理器和存储介质也可以作为分立组件存在于网络设备或终端设备中。
存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质,但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置,用于存储程序指令和/或数据。
可选地,通信装置1400可以包括指令1430(有时也可以称为代码或程序),所述指令1430可以在所述处理器上被运行,使得所述通信装置1400执行上述实施例中描述的方法。处理器1410中可以存储数据。
可选地,通信装置1400还可以包括收发器1450以及天线1406。所述收发器1450可以称为收发单元,收发模块、收发机、收发电路、收发器,输入输出接口等,用于通过天线1406实现通信装置1400的收发功能。
本申请中描述的处理器1410和收发器1450可实现在集成电路(integrated circuit,IC)、模拟IC、射频集成电路(radio frequency identification,RFID)、混合信号IC、ASIC、印刷电路板(printed circuit board,PCB)、或电子设备等上。实现本文描述的通信装置,可以是独立设备(例如,独立的集成电路,手机等),或者可以是较大设备中的一部分(例如,可嵌入在其他设备内的模块),具体可以参照前述关于终端设备,以及网络设备的说明,在此不再赘述。
可选地,通信装置1400还可以包括以下一个或多个部件:无线通信模块,音频模块,外部存储器接口,内部存储器,通用串行总线(universal serial bus,USB)接口,电源管理模块,天线,扬声器,麦克风,输入输出模块,传感器模块,马达,摄像头,或显示屏等等。可以理解,在一些实施例中,通信装置1400可以包括更多或更少部件,或者某些部件集成,或者某些部件拆分。这些部件可以是硬件,软件,或者软件和硬件的组合实现。
本领域内的技术人员应明白,本申请的实施例可提供为方法、系统、或计算机程序产品。因此,本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
显然,本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的范围。这样,倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内,则本申请也意图包含这些改动和变型在内。
以上所述,仅为本申请的具体实施方式,但本申请的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本申请揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本申请的保护范围之内。因此,本申请的保护范围应以所述权利要求的保护范围为准。
Claims (28)
- 一种通信方法,其特征在于,包括:从第二终端装置接收第一指示信息,所述第一指示信息用于指示第一资源,所述第一资源为所述第二终端装置预约的用于发送第一数据的资源,所述第一资源在频域上对应的资源属于第一信道;根据所述第一指示信息确定第二资源;在所述第二资源上发送第二数据,所述第二资源的起始时间单元在所述第一资源的结束时间单元之后,第二资源在频域上对应的资源属于所述第一信道。
- 根据权利要求1所述的方法,其特征在于,所述方法还包括:在第一侦听时间单元通过先听后说过程侦听所述第一信道的状态为空闲,根据所述第一资源在所述第一侦听时间单元中止所述先听后说过程,所述第一侦听时间单元在所述第一资源的起始的时间单元之前。
- 根据权利要求1或2所述的方法,其特征在于,所述根据所述第一资源在所述第一侦听时间单元中止所述先听后说过程包括:确定所述第一资源的起始时间单元与所述第一侦听时间单元之间的时长小于或等于第一阈值时,在所述第一侦听时间单元中止所述先听后说过程,所述第一阈值大于0小于或等于所述第二数据的时延要求。
- 根据权利要求2或3所述的方法,其特征在于,所述根据所述第一资源在所述第一侦听时间单元中止先听后说过程,包括:将计数器的取值从Q递减为M后,中止递减,其中1≤M≤Q,所述Q为所述计数器的初始取值。
- 根据权利要求4所述的方法,其特征在于,所述方法还包括:在第二侦听时间单元侦听所述第一信道的状态为空闲,从M开始继续递减所述计数器的取值,所述第二侦听时间单元在所述第一资源的结束时间单元之后,所述第二资源的起始时间单元为所述计数器的取值递减至0时所在的时间单元。
- 根据权利要求1至5中任一项所述的方法,其特征在于,所述方法还包括:从所述第二终端装置接收第一参考信号;确定接收所述第一参考信号的功率大于或等于参考信号接收功率阈值。
- 根据权利要求1至6中任一项所述的方法,其特征在于,所述方法还包括:从所述第二终端装置接收第三指示信息,所述第三指示信息用于指示为所述第二终端装置发送数据的目的端。
- 根据权利要求1至7中任一项所述的方法,其特征在于,所述方法还包括:从所述第二终端装置接收第四指示信息,所述第四指示信息用于指示第一数据的优先级;确定所述第一数据的优先级高于或等于所述第二数据的优先级。
- 一种通信方法,其特征在于,包括:从第二终端装置接收第一指示信息,所述第一指示信息用于指示第一资源,所述第一 资源为第二终端装置预约发送第二数据的资源;根据所述第一资源和第一信道占用时间确定第三资源,所述第三资源属于所述第一资源和所述第一信道占用时间,所述第三资源用于第二终端装置发送第一数据,所述第一信道占用时间的起始时间单元在所述第一资源的起始时间单元之前;在第四资源上发送所述第二数据,所述第四资源属于所述第一信道占用时间内除所述第三资源以外的资源。
- 根据权利要求9所述的方法,其特征在于,所述方法还包括:向所述第二终端装置发送第二指示信息,所述第二指示信息用于指示所述第三资源。
- 根据权利要求10所述的方法,其特征在于,向所述第二终端装置发送第二指示信息,包括:在第一时段向所述第二终端装置发送所述第二指示信息,所述第一时段的起始时刻在所述第四资源的起始时间单元与所述第三资源的起始时间单元范围内,且所述第一时段的起始时刻与所述第四资源的起始时间单元之间的时长大于或等于第二阈值。
- 根据权利要求9至11中任一项所述的方法,其特征在于,所述方法还包括:从所述第二终端装置接收第三指示信息,所述第三指示信息用于指示为所述第二终端装置发送数据的目的端。
- 根据权利要求9至12中任一项所述的方法,其特征在于,所述方法还包括:从所述第二终端装置接收第一参考信号;确定接收所述第一参考信号的功率大于或等于参考信号接收功率阈值。
- 根据权利要求9至13中任一项所述的方法,其特征在于,所述方法还包括:从所述第二终端装置接收第四指示信息,所述第四指示信息用于指示第一数据的优先级;确定所述第一数据的优先级高于或等于所述第二数据的优先级。
- 根据权利要求9至14中任一项所述的方法,其特征在于,所述第一指示信息承载于来自所述第二终端装置的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
- 一种通信方法,其特征在于,包括:发送第一指示信息,所述第一指示信息用于指示第一资源,所述第一资源为第二终端装置预约发送第一数据的资源;在第三资源上发送所述第一数据,所述第三资源是根据所述第一资源和第一信道占用时间确定的,所述第一占用信道的起始时间单元在所述第一资源的起始时间单元之前,所述第三资源属于所述第一资源和第一信道占用时间。
- 根据权利要求16所述的方法,其特征在于,所述方法还包括:从第一终端装置接收第二指示信息,所述第二指示信息用于指示所述第三资源。
- 根据权利要求17所述的方法,其特征在于,从所述第一终端装置接收第二指示信息,包括:在第一时段从所述第一终端装置接收第二指示信息,所述第一时段的起始时刻在所述第四资源的起始时间单元与所述第三资源的起始时间单元范围内,且所述第一时段的起始时刻与所述第四资源的起始时间单元之间的时长大 于或等于第二阈值。
- 根据权利要求16至18中任一项所述的方法,其特征在于,所述方法还包括:发送第三指示信息,所述第三指示信息用于指示所述第一终端装置为发送所述第一数据的目的端。
- 根据权利要求16至19中任一项所述的方法,其特征在于,所述方法还包括:发送第四指示信息,所述第四指示信息用于指示发送所述第一数据的优先级。
- 根据权利要求16至20中任一项所述的方法,其特征在于,所述方法还包括:发送第一参考信号。
- 根据权利要求16至21中任一项所述的方法,其特征在于,所述第一指示信息承载于来自的第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一个。
- 一种通信装置,其特征在于,包括用于执行如权利要求1至8中,或者,如权利要求9至15中任一项所述的方法的模块。
- 一种通信装置,其特征在于,包括用于执行如权利要求16至22中任一项所述的方法的模块。
- 一种通信系统,其特征在于,包括如权利要求23和如权利要求24所述的通信装置。
- 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质用于存储计算机程序,当所述计算机程序在计算机上运行时,使得所述计算机执行如权利要求1至8中任一项所述的方法,和/或,如权利要求9至15中任一项所述的方法,和/或,如权利要求16至22中任一项所述的方法。
- 一种装置,其特征在于,包括处理器和通信接口,所述处理器用于读取指令以执行如权利要求1至8中任一项所述的方法,和/或,如权利要求9至15中任一项所述的方法,和/或,如权利要求16至22中任一项所述的方法。
- 根据权27所述的装置,其特征在于,所述装置为芯片。
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