CN115190454A - Communication method and device - Google Patents
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- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
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Abstract
A communication method and device are applied to the technical field of wireless communication. The method comprises the following steps: the first terminal device may determine a candidate resource according to at least one of the discontinuous reception configuration information, the first resource, or the second resource; the first resource and the second resource are respectively one of periodically spaced partial sensing resources or continuously distributed partial sensing resources, and the discontinuous reception configuration information is used for determining a reception time and a non-reception time. The first terminal device may transmit the first data packet according to the candidate resource. Therefore, the first terminal device needs to consider at least one of the discontinuous reception configuration information, the first resource, and the second resource when determining the candidate resource of the first packet, and therefore, the validity of the determination of the candidate resource can be improved in a scenario in which the discontinuous reception is effective.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a communication method and apparatus.
Background
At present, a vehicle may obtain road condition information or receive information service in time through a vehicle to vehicle (V2V), a vehicle to roadside infrastructure (V2I), a vehicle to pedestrian communication (V2P), or a vehicle to network (V2N), which may be collectively referred to as vehicle to anything (V2X). In V2X communication, sidelink Control Information (SCI) and sidelink data are transmitted from a transmitting terminal device to a receiving terminal device via a Sidelink (SL), and the receiving terminal device receives and decodes the sidelink data by receiving the SCI, which may be referred to as sidelink communication.
In the current sidelink communication, the sending end terminal device may detect sidelink transmissions of other terminal devices that may occur at intervals of a step length on a partial time domain resource on a time axis, and an obtained monitoring result for a transmission resource may be referred to as a partial monitoring result. Based on these partial listening results, the sending end terminal device may select time-frequency resources for transmission within a selection window (selection window). Such a resource selection scheme may be referred to as partial awareness. Because the UE only performs partial sensing in the process of determining transmission resources in the selection window, power consumption of the UE can be saved.
Further, 3GPP also discusses a way to reduce the power consumption of the receiver by Discontinuous Reception (DRX). Since the terminal device cannot perform resource monitoring during the non-reception time of DRX, when the discontinuous reception and the partial sensing function are used in combination, it needs to be considered that the effectiveness of the partial sensing resource selection is not affected as much as possible under the condition of reducing the power consumption of the UE as much as possible.
However, there is currently no scheme for how the partial awareness of the terminal device is implemented in the scenario where DRX is in effect, resulting in a reduction in the effectiveness of the partial awareness when DRX is in effect.
Disclosure of Invention
The application provides a communication method and device, which are used for improving the effectiveness of a partial perception scheme of a terminal device in a scene that DRX is effective.
In a first aspect, a method of communication is provided, the method being performed by a first terminal device. The first terminal device includes a first terminal device or a component in the first terminal device, the first terminal device may be a data sending end in V2X communication, for example, a sending-end vehicle that needs to send relevant information of an accident to other vehicles when encountering the sudden traffic accident during driving, or a roadside unit that detects the sudden traffic accident, and the component in the first terminal device may be, for example, a processor, a vehicle-mounted communication module, a chip or a chip system, etc. loaded in the sending-end vehicle. Wherein the first terminal device supports direct communication (PC 5) interface communication.
A first aspect provides a method comprising a first terminal device determining a candidate resource based on at least one of discontinuous reception, DRX, configuration information, a first resource or a second resource; the first resource is a part of sensing resources at periodic intervals, and the second resource is a part of sensing resources distributed continuously; or the first resource is a part of sensing resources which are distributed continuously, and the second resource is a part of sensing resources at periodic intervals; the DRX configuration information is used to determine a reception time and a non-reception time. The first terminal device may also transmit the first data packet according to the candidate resource.
With the above method, the first terminal device needs to consider at least one of the DRX configuration information, the first resource, and the second resource when determining the candidate resource of the first packet, and therefore, the effectiveness of determining the candidate resource can be improved in a scenario in which DRX is in effect, so as to improve the reliability of sidelink communication.
In one possible design, the first terminal device may determine the candidate resource based on the first resource when a first condition is satisfied, where the first condition includes at least one of: the second resource is located at a non-reception time; alternatively, the first resource is located at the reception time.
With this design, the first terminal device may determine, in a case where the first resource and the second resource are configured, the candidate resource only from the first resource in a case where the first resource is located at a non-reception time and/or the second resource is located at a reception time, to reduce the perceived power consumption.
In one possible design, the first resource may be located at a non-reception time, and the first terminal device may determine the candidate resource based at least on the first resource when the second condition is satisfied.
With this design, the first terminal apparatus can determine the candidate resource based on the first resource even when the first resource is located at the non-reception time, so as to improve the validity of the candidate resource determination.
In one possible design, the first terminal device may determine the candidate resource according to at least a listening result of the second resource when the second resource is located at the reception time or when the second resource is located at the non-reception time and the second condition is satisfied.
With this design, the first terminal apparatus can determine the candidate resource based on the second resource when the second resource is located at the reception time or when the second resource is located at the non-reception time and the second condition is satisfied, so as to improve the reliability of communication. And when the second condition is satisfied, even if the first resource and/or the second resource is/are located at the non-receiving time, the candidate resource can be determined according to the first resource and the second resource, and the effectiveness of determining the candidate resource can be further improved.
In one possible design, the second condition may include at least one of: the first terminal device receives a negative response of a second data packet, wherein the second data packet is a data packet sent before the first data packet; or the priority of the first data packet is not lower than a first threshold; or the channel state parameter value of the resource pool where the candidate resource is located is not lower than a second threshold; or, the first terminal device is configured to perform re-evaluation or preemption evaluation; or, the first resource is located at a non-reception time, and the first terminal device receives first indication information, where the first indication information is used to indicate: and when the first resource is positioned at the non-receiving time, the first terminal device at least determines the candidate resource according to the sensing result corresponding to the first resource.
In a possible design, the first resource is a part of sensing resources at periodic intervals, the second resource is a part of sensing resources distributed continuously, and a part or all of the first resource is located at a non-receiving time, the first terminal device may determine the candidate resource at least according to a monitoring result of a third resource in the sensing window, where the third resource is one or more groups of monitoring resources closest to the first time, and the first time is a time at which the first terminal device is triggered to determine the uplink resource.
By adopting the design, the effectiveness of determining the candidate resources can be further improved.
In one possible design, the DRX configuration may be used to determine a reception time of a second terminal device, the one or more sets of listening resources being located at the reception time of the second terminal device, the second terminal device being a reception device for the first data packet.
With this design, the effectiveness of candidate resource determination can be further improved.
In one possible design, the first resource is a periodically spaced partial sensing resource, the second resource is a continuously distributed partial sensing resource, and when M time units in the first resource are located at non-reception time, the candidate resource may not include resources associated with the M time units in the selection window, where M is a positive integer.
By adopting the design, the effectiveness of determining the candidate resources can be further improved.
In one possible design, the first terminal device may determine the candidate resource according to a random selection when the following conditions are satisfied: part or all of the first resources and part or all of the second resources are located at non-reception times.
With this design, power consumption in the candidate resource determination process can be further reduced.
In one possible design, the first terminal device may determine the candidate resource based on the first resource and the second resource when the first resource and the second resource are located at a reception time determined by the DRX configuration.
By adopting the design, the effectiveness of determining the candidate resources can be further improved.
In one possible design, the first terminal device may determine the candidate resource at least according to L fourth resources in the selection window, where the fourth resources are continuously distributed partial sensing resources other than the first resource and the second resource, and L is a positive integer.
By adopting the design, the effectiveness of determining the candidate resources can be further improved.
In one possible design, the candidate resource may include K resource units, where K is less than or equal to a third threshold, where the third threshold may be determined according to one or more of the following information, and K is a positive integer: the number of resource units required by N transmissions of a first data packet, wherein N is a positive integer; or, a channel state parameter value on the resource pool; or, the priority of the first packet; or, configuration signaling; or alternatively, a predefined value.
In one possible design, the DRX configuration information may include DRX configuration information of the first terminal device and/or DRX configuration information of a second terminal device, wherein the second terminal device is a receiving device for the first data packet.
In one possible design, the candidate resource may be located at a reception time of the second terminal device.
In one possible design, the DRX configuration information may include one or more of a period, a start time, a DRX received duration, or a DRX non-received duration of DRX.
In a second aspect, a communication method is provided, the method being performed by a first terminal device. The first terminal device includes a first terminal device or a component in the first terminal device, the first terminal device may be a data sending end in V2X communication, for example, a sending end vehicle that needs to send relevant information of an accident to other vehicles when encountering the accident during driving, or a roadside unit that detects the accident, and the component in the first terminal device may be, for example, a processor, a vehicle-mounted communication module, a chip or a chip system that is loaded in the sending end vehicle. Wherein the first terminal device supports direct communication interface communication.
A second aspect provides a method comprising a first terminal device determining a resource for signal quality measurement of a first time slot based on first information, wherein the first information indicates that the first terminal device performs power saving operation and/or indicates the resource. The first end device may also make signal quality measurements on the resources.
With the above method, the first terminal device can determine to perform signal quality measurement on the resource for signal quality measurement according to the first information, thereby improving the accuracy of the signal quality measurement.
In one possible design, the energy saving operation includes at least one of: discontinuous reception; or, an energy-saving resource selection mode; alternatively, the transmission is discontinuous.
In one possible design, the energy-saving resource selection mode includes any one of the following: selecting random resources; or, partially-aware resource selection; or, resource selection based on the configured scheduling type 1; or a resource selection based on the configured scheduling type 2.
In one possible design, the resources used for signal quality measurement include resources occupied by a demodulation reference signal of a control channel in the first slot, and a size of a sub-channel of the data channel indicated by the control channel is greater than 20 physical resource blocks PRB.
With the above method, the first terminal apparatus may not measure the signal quality on the resource occupied by the DMRS of the data channel, thereby saving power consumption.
In one possible design, the resources include resources occupied by demodulation reference signals of the control channel in the first slot and/or resources occupied by demodulation reference signals of the data channel on symbols occupied by the control channel in the first slot. Optionally, the number of the sub-channels of the data channel indicated by the control channel is greater than or equal to 20 physical resource blocks PRB.
By adopting the method, the first terminal device can measure the signal quality on the resource occupied by the DMRS in the control channel and the data channel, so as to improve the measurement accuracy.
In one possible design, the signal quality is a received signal strength indicator RSSI, and the resource is a symbol where a control channel is located in the first time slot in the time domain, and is a frequency domain resource occupied by the control channel and a data channel on the symbol in the frequency domain. Optionally, the number of the subchannels of the data channel indicated by the control channel is greater than or equal to 20 physical resource blocks PRB.
By adopting the method, the first terminal device can perform RSSI measurement on fewer resources so as to save power consumption.
In one possible design, the control channel is PSCCH, the data channel is PSCCH, and the channel quality includes RSRP and RSSI.
In a third aspect, an embodiment of the present application provides a communication apparatus, which may implement the method implemented by the first terminal apparatus in the first aspect, the second aspect, or any possible design thereof. The device comprises corresponding units or means for performing the above-described method. The means comprising may be implemented by software and/or hardware means. The device may be, for example, the first terminal device, or a component or a chip, a chip system, an in-vehicle communication module, or a processor, which may support the first terminal device to implement the method described above.
Illustratively, the communication device may include a transceiver unit (or communication module, transceiver module) and a processing unit (or processing module), which may perform the corresponding functions of the first terminal device in the first aspect, the second aspect, or any possible design thereof. When the communication apparatus is the first terminal apparatus, the transceiver unit may be a transmitting unit when the transmitting step is performed, the transceiver unit may be a receiving unit when the receiving step is performed, and the transceiver unit may be replaced by a transceiver, the transmitting unit may be replaced by a transmitter, and the receiving unit may be replaced by a receiver. The transceiving unit may comprise an antenna, a radio frequency circuit and the like, and the processing unit may be a processor, such as a baseband chip and the like. When the communication device is a component having the above-mentioned function of the first terminal device, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor. When the communication device is a chip system, the transceiving unit may be an input/output interface of the chip system, and the processing unit may be a processor of the chip system, for example: a CPU.
The transceiving unit may be adapted to perform the actions of receiving and/or transmitting performed by the first terminal device in the first aspect, the second aspect or any possible design thereof. The processing unit may be adapted to perform actions other than the receiving and sending performed by the first terminal device in the first aspect, the second aspect or any possible design thereof.
Optionally, the communication device may comprise a transceiver module and/or a communication module.
Optionally, the communication device may include a processor and/or a transceiver. The communication device may also include a memory.
In a fourth aspect, a communication system is provided, the communication system comprising the communication device shown in the third aspect and a second communication device, the second communication device being operable to receive the first data packet from the first communication device, the second communication device being operable to support sidelink communication.
In a fifth aspect, there is provided a computer readable storage medium for storing a computer instruction or a program which, when run on a computer, causes the computer to perform the method of the first aspect, the second aspect or any one of its possible implementations.
A sixth aspect provides a computer program product which, when run on a computer, causes the computer to perform the method of the first aspect, the second aspect, or any one of its possible designs.
In a seventh aspect, there is provided a circuit, coupled to a memory, for performing the method of the first aspect, the second aspect, or any one of its possible implementations. The circuit may comprise a chip circuit, a chip or a system of chips, etc.
Advantageous effects of the above second to seventh aspects and possible designs thereof may be referred to advantageous effects in the first aspect and possible designs thereof.
Drawings
Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;
fig. 2 is a schematic architecture diagram of another communication system according to an embodiment of the present application;
fig. 3 is a time domain diagram of resource sensing provided in an embodiment of the present application;
fig. 4 is a schematic time domain structure diagram of DRX provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of another communication device according to an embodiment of the present application;
fig. 7 is a flowchart illustrating a communication method according to an embodiment of the present application;
fig. 8 is a time-domain diagram of another resource sensing provided in an embodiment of the present application;
FIG. 9 is a time domain diagram of another resource sensing provided by an embodiment of the present application;
FIG. 10 is a time domain schematic diagram of another resource awareness provided by an embodiment of the present application;
fig. 11 is a time-domain diagram of another resource sensing provided in an embodiment of the present application;
fig. 12 is a time-domain diagram of another resource sensing provided by an embodiment of the present application;
FIG. 13 is a time-domain diagram of another resource awareness provided in an embodiment of the present application;
fig. 14 is a flowchart illustrating another communication method according to an embodiment of the present application;
fig. 15 is a time domain schematic diagram of a DMRS symbol provided in an embodiment of the present application;
fig. 16 is a time domain schematic diagram of another DMRS symbol provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
Hereinafter, some terms in the embodiments of the present application are explained so as to be easily understood by those skilled in the art.
1) The terminal device is, for example, a terminal device, or a module for implementing functions of the terminal device, such as a chip system, which may be provided in the terminal device. The terminal device includes a device providing data connectivity to a user, and specifically, includes a device providing data connectivity to a user, or includes a device providing data connectivity to a user. For example, may include a handheld device having wireless connection capability, or a processing device connected to a wireless modem. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchange data with the RAN, or exchange data with the RAN. The terminal device may include a User Equipment (UE), a wireless terminal device, a mobile terminal device, a device-to-device (D2D) terminal device, a V2X terminal device, a machine-to-machine-type communication (M2M/MTC) terminal device, and an internet of things (IoT) terminal device. Most typically, the terminal device may be a vehicle or terminal-type roadside unit, or a communication module or chip built into the vehicle or roadside unit.
In the embodiment of the application, direct communication (PC 5) interface communication is supported between the terminal devices, namely, transmission through a sidelink is supported.
By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable smart device or intelligent wearable equipment etc. is the general term of using wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. The wearable device may be worn directly on the body or may be a portable device integrated into the user's clothing or accessory. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.
The various terminal devices described above, if located on (e.g. placed in or installed in) a vehicle, may be considered to be vehicle-mounted terminal devices, which are also referred to as On Board Units (OBUs), for example.
In this embodiment, the terminal device may further include a relay (relay). Or, it is understood that any device capable of data communication with a base station may be considered a terminal device.
Hereinafter, the communication method provided in the embodiments of the present application may be described by taking a terminal device as an example. For example, the transmitting terminal device may be replaced by a transmitting terminal apparatus or a transmitting terminal apparatus, the receiving terminal device may be replaced by a receiving terminal apparatus or a receiving terminal apparatus, and the auxiliary terminal device may be replaced by an auxiliary terminal apparatus.
2) Network equipment, for example, including Access Network (AN) equipment, such as a base station (e.g., AN access point), may refer to equipment in AN access network that communicates with a terminal device over one or more cells over AN air interface, or, for example, network equipment in one type of V2X technology is a Road Side Unit (RSU). The RSU may be a fixed infrastructure entity supporting V2X applications, and may exchange messages with other entities supporting V2X applications. The network device may include a next generation node B (gNB) in a New Radio (NR) system (also referred to as an NR system for short) of the fifth generation mobile communication technology (the 5th generation,5 g), or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a Cloud RAN (Cloud RAN) system, which is not limited in the embodiments of the present application.
Since the embodiments of the present application mainly relate to access network devices, hereinafter, unless otherwise specified, all the network devices refer to access network devices. Hereinafter, the network device and/or the access network device may be represented by a base station.
In the embodiment of the present application, the apparatus for implementing the function of the network device may be a network device, or may be an apparatus capable of supporting the network device to implement the function, for example, a system on chip, and the apparatus may be installed in the network device. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a network device is taken as an example of a network device, and the technical solution provided in the embodiment of the present application is described.
(3) The sidestream communication is a communication performed between the terminal device and the terminal device in the present application.
Under the third generation partnership project (3 GPP) standard R16 architecture, the mode (mode) of sidestream communication includes both mode1 and mode 2. In this application, under mode1, there are configuration based scheduling type 1 and configuration based scheduling type 2. Wherein, the configuration-based scheduling type 1 refers to: and the base station configures resources for transmission of the terminal equipment, and the terminal equipment transmits according to the configured resources under the condition of no need of further scheduling according to the service condition. The configuration-based scheduling type 2 means that the base station configures one resource available for transmission, and the terminal device performs persistent transmission using the configured resource. As shown in fig. 1, in mode1, a base station can schedule resources (or referred to as sidelink communication resources) for sidelink transmission to terminal apparatus 1 and/or terminal apparatus 2, and terminal apparatus 1 performs sidelink transmission to terminal apparatus 2 based on the resources scheduled by the base station. In mode2, a resource pool may be configured or preconfigured by the base station, the terminal apparatus 1 performs resource sensing (or called interception, resource sensing or sensing, or the like) and resource selection in the resource pool, and performs sidelink transmission to the terminal apparatus 2 through the selected resource. For the terminal device 1 making the mode sidelink transmission, it needs to have sensing capability or transmission resource supporting communication through sensing selection sidelink. Alternatively, the resource pool may be continuous or discontinuous in the time domain, and may also be continuous or discontinuous in the frequency domain. This is not limited in this application.
The sidelink communication resource refers to a resource scheduled by a base station and used for sidelink transmission in the present application, or refers to a time-frequency resource in a resource pool used for sidelink communication. The terminal apparatus 1 can perform sidelink transmission on the resource. One resource may carry a Physical Sidelink Control Channel (PSCCH), a physical sidelink shared channel (PSCCH), a physical sidelink feedback channel (PSCCH), and/or a demodulation reference signal (DMRS). The reference signal may be carried in one or more Resource Elements (REs), and the REs may occupy one symbol in a time domain and one subcarrier in a frequency domain. The time domain scheduling unit of the side line resource is a time slot, and the frequency domain scheduling unit is a subchannel.
In mode2, the terminal device 1 may measure the signal strength of the resource in the listening window (sensing window), for example, detect a Reference Signal Received Power (RSRP) measurement of the resource, if the RSRP measurement is greater than or equal to a threshold (e.g., RSRP threshold Th) RSRP Hereinafter referred to as RSRP threshold), the resource is considered to be occupied by other terminal devices.
The terminal apparatus 1 excludes the resource in the resource selection window corresponding to the resource from the candidate resource set. For example, the resource in the resource selection window corresponding to the excluded resource may be a resource determined according to the resource and the resource reservation period. The resource reservation period is a signaling configured or predefined period value, which may be indicated by the SCI. The SCI may indicate a reservation period, a currently used time-frequency resource. The currently used time-frequency resources and the reserved period can correspond to the resources reserved after the SCI sending time, and the resources can be referred to as the periodically reserved resources in the application. From the transmitting device's perspective, the periodically reserved resources are reserved by the SCI that the transmitting device transmits over. From the perspective of the receiving device, it receives the SCIs sent by other devices, and thus determines the resources that these devices periodically reserve through the SCIs that it sends.
In this application, optionally, the RSRP threshold is determined according to the priority of the data that needs to be sent by the terminal device 1 and the priority of the data corresponding to the resource. The data corresponding to the resource includes data being transmitted by the resource and/or data reserved for transmission on the corresponding resource. The priority of the data corresponding to the resource can be obtained through sensing the resource in the listening window. For example, the terminal device 1 may obtain the indication information of the priority of the data being transmitted on the resource 1 through the perception of the resource 1, so as to know the priority of the data being transmitted on the resource 1. Alternatively, terminal device 1 may obtain, at resource 2, priority indication information through perception of resource 2 within the listening window, the priority indication information indicating a priority of data intended for transmission on resource 1 within the resource selection window, where resource 2 may precede resource 1.
It should be understood that, in the present application, the signal strength may include a Received Signal Strength Indicator (RSSI), a Reference Signal Received Quality (RSRQ), or other parameters that may represent the signal strength. Alternatively, the RSRP in the present application may be replaced by RSSI or RSRQ. A subchannel is a set of frequency domain resource units consisting of L continuous or discontinuous Physical Resource Blocks (PRBs) continuously occupied in the frequency domain. L is a preset positive integer, for example: 8, 10, 12, 15, 20, 25, or 50, etc. The embodiments of the present application are not limited to specific values.
It should be understood that, in the present application, a certain measurement amount may be used to describe the idle/busy level of the resource pool occupied at a specific time. A Channel Busy Ratio (CBR) or a channel occupancy ratio (CR). Wherein CBR is defined as: on the resource pool, in time unit [ n-a, n-1 ]]The number of subchannels exceeding a certain RSSI threshold is a ratio of the total number of subchannels. Optionally, the CBR may be measured in a continuous time unit in a time domain, or may be measured in a discontinuous time unit, which is not limited in this embodiment of the present application. Optionally, a larger value of CBR indicates that the channel is more used by users or occupied by transmissions, and/or indicates that the channel is more congested. Conversely, if the value of CBR is smaller, the channel is more idle. Wherein CR is defined as: on the resource pool, in time unit [ n-a, n-1 ]]The number of subchannels S1 used for transmission, and in time unit [ n, n + b]The number of subchannels to be used for a person S2; dividing the sum of S1 and S2 by [ n-a, n + b ]]All total number of subchannels S. Namely CRThe value of (S1 + S2)/S. Wherein n is the time of triggering resource selection, and a and b are non-negative integers. Optionally, a + b +1 ≧ c, c is a predefined constant, e.g., c is 1000 or 1000 x 2 u . u is the carrier spacing value used in transmission. Optionally, the CR may be measured in a continuous time unit in a time domain, or may be measured in a discontinuous time unit, which is not limited in this embodiment of the present application. Alternatively, a larger value of CR indicates that the channel is used more by users or occupied by more transmissions. Indicating that the channel is more congested. Otherwise, the more idle the channel.
In the resource sensing process, the terminal apparatus 1 may exclude the periodically reserved resource of the resource in the candidate resource set through resource sensing. The remaining resources (i.e., resources not excluded) within the listening window may be used for sidelink transmissions, or alternatively, the remaining resources may be candidate resources for sidelink transmissions. The resource or candidate resource used for the sidestream transmission refers to a resource or a set of resources employed or considered by the transmitting terminal apparatus for the sidestream transmission to the receiving terminal apparatus. It should be understood that the resource in this application refers to a time-frequency resource.
(4) Time of triggering resource selection
The time for triggering the resource selection or the resource selection triggering time is the time point of the resource selection triggering. A higher layer (higer layer) requests the terminal device to determine the time of a set of resource sets for resource selection during data transmission. The higher layer may be a protocol or signaling of the base station, or may be an upper layer protocol stack (such as an upper layer software, a Medium Access Control (MAC) layer, etc.) of the terminal apparatus. As shown in fig. 3, this trigger time may be denoted as n. The time may be the position of a certain symbol, a certain slot, a certain mini-slot (any number of symbols occupying 1 to 12 or 1 to 14 symbols), a certain subframe or radio frame, etc. Taking time slot n as an example, in order to solve the resource selection, the higher layer provides the terminal device with parameters for resource selection at the trigger time slot n. These parameters include one or more of the following: the resource pool used, the priority of the physical layer, the remaining PDBs, the number of sub-channels required on a time slot, the interval of resource reservation, etc. Optionally, the time for triggering the resource selection is usually the time when the application layer data is about to be delivered through the physical layer after the protocol stack has already assembled the packet. For example, the time when the resource selection is triggered may be the time when a Transport Block (TB) of the MAC layer arrives (or is about to be sent, or is about to arrive) at the physical layer. In the embodiment of the present application, a time instant of triggering resource selection is described by taking a time slot n as an example, but this does not exclude that the time slot n may be replaced by a time instant n of transmission of other time length units, such as a symbol n, a mini-slot n, and the like.
It should be understood that in the present application, one Transport Block (TB) may be used to carry one or more data packets transmitted over the sidelink.
(5) Listening window
In this application, the listening window may also be referred to as a resource listening window, or may also be referred to as a listening window, a detection window, or an equal sensing window. Illustratively, the listening window is a set of time-frequency resources for a period of time before the time at which resource selection is triggered by the terminal device. Since the time when the terminal device needs to perform resource selection in the physical layer occurs at the time when resource selection is triggered, the terminal device knows whether resource selection is needed only after the time when resource selection is triggered arrives. Therefore, the terminal device always performs resource sensing so that when the time for triggering resource selection arrives, an appropriate transmission resource after the time for triggering resource selection is determined according to the sensing result before the time for triggering resource selection. Alternatively, the terminal device typically performs detection and analysis all the way forward by the length of the listening window.
Referring to FIG. 3, the time domain position of the listening window is [ n-T ] 0 ,n-T proc,0 ). Wherein, n-T 0 Listening to the starting position of the window for the resource, e.g. T 0 May be 1100 milliseconds (ms) or 100ms, or may be other values. Taking the subcarrier spacing of 15 kilohertz (kHz) as an example, T 0 =1100 time slot or 100 time slot; alternatively, T is the 60kHz subcarrier spacing for example 0 =4400 slots or 400 slots. T is proc,0 Is hairSending the time of processing the monitoring result to the terminal device according to the different T of the terminal device capability proc,0 Will be different in value of T proc,0 ≥0。
(6) Selection window
In this application, the selection window may also be referred to as a resource selection window. Is a part or all of the time domain resources within the packet delay margin (PDB) remaining after the time instant at which the resource selection is triggered. Referring to fig. 3, the terminal device may select a resource selection window n + T according to the sensing result 1 ,n+T 2 ]And the unavailable time frequency resources are internally excluded, so that the sending terminal device obtains the available time frequency resources for sending the TB, and the resources adopted by the sideline transmission are obtained through resource selection. Wherein, T 1 Is a non-negative constant, T 2 Is a constant that does not exceed the remaining PDB. The terminal device needs to determine transmission resources for the TB to be transmitted within the selection window. Optionally, the terminal device needs to send the TB to be transmitted according to the determined transmission resource within the selection window. Alternatively, a terminal device (e.g., physical layer) may determine a candidate or available set of resources (which may be referred to as a candidate set of resources, where the resources may be referred to as candidate resources) in a selection window, and then report these sets of resources to a higher layer (e.g., MAC layer), which then determines transmission resources from this set of resources. Optionally, the physical layer of the terminal device may directly determine transmission resources according to the determined candidate or available resource set, and send the TB to be transmitted.
The time when the service layer of the terminal device generates data is the starting time of the PDB, and the PBD is the maximum delay, which may be before the time n. PDB after time n is the remaining PDB.
By way of example and not limitation, the time domain range of the listening window in the present application may also not be limited to [ n-T ] 0 ,n-T proc,0 ) And/or the time range of the resource selection window may also not be limited to [ n + T ] 1 ,n+T 2 ]. That is, the time domain extent of the listening window and/or the resource selection window may not be specifically constrained.
(7) Resource selection mode
Currently, in mode2, the manner in which the terminal device selects resources for sidelink transmission from the resource pool includes random resource selection (random selection), partial sensing (partial sensing) resource selection, full sensing (full sensing), and the like.
The random resource selection means that the terminal device determines resources from a resource selection window in a random selection manner, and the resource selection manner does not need the terminal device to support sensing, and the terminal device may even have no resource sensing capability. Optionally, the terminal that performs random resource selection may also have a sensing capability, which is not limited in this embodiment of the present application.
Under partial sensing, the terminal device only senses the occupied condition of a part of resources in the resource pool, but does not sense other resources, and then the terminal device can select transmission resources from the sensed unoccupied resources and/or the sensed resources. The terminal devices that select resources in this way are partially aware devices, such as those being studied in the 3GPP standard R17.
The partial sensing includes periodic based partial sensing (PPS) and/or short-time sensing (STS).
The periodic partial sensing or periodic sensing means that the terminal device determines a partial sensing resource for detection at intervals of a step Pstep on a partial time domain resource on a time axis. And then sensing possible sideline transmission from all or part of the partial sensing resources. Can be described as: t is t y-k*Pstep 。
Where k is an integer, the step size Pstep may be a full set or a subset of a set of all reservation period values, and the reservation period is configured or predefined by signaling. t is t y May be one candidate time slot of a candidate resource of size Y determined from the selection window according to the cycle based partial sensing. Optionally, t y Y in (1) can take the value y 0 ,y 1 ,…,y Y-1 。
And then selecting time-frequency resources for transmission in the selection window based on the detection result.For example, taking the example that 10 candidate sensing resource subsets are configured at equal intervals Pstep, each candidate sensing resource subset may be referred to as a group of sensing resources, and the positions thereof are: t is t y-10Pstep 、t y-9Pstep 823060 \ 8230a &' t y-Pstep Can pass through t y-10Pstep 、t y-9Pstep 8230a nd t y-Pstep These candidate perceptual resource subsets are represented separately. Wherein the size (or length) of each candidate perceptual resource listening subset is Y slots (or subframes). According to the value of y, t y The first time slot in Y, the middle time slot, or the last time slot may be used. For convenience of description, the resource sensed by the terminal device in the period-based partial sensing may be referred to as a periodically spaced partial sensing resource or a periodic partial sensing resource. It should be understood that the periodically spaced partial sensing resources may include t y-10Pstep 、t y-9Pstep 823060 \ 8230a &' t y-Pstep One or more sets of perceptual resources.
Optionally, for the periodic partial sensing operation, the time slot for performing the partial sensing operation may be one or more groups of sensing resources, where each group of sensing resources is represented by t y-k*Pstep Determined by the corresponding value of k. For example, if the value of k is fixed to a predefined integer, then only the group to which the value of k corresponds. For example, if the value of k can take 1,2 then there can be t y-Pste And t y-2*Pste Two groups. For example, if the value of k can take 1,2,3 then there can be t y-Pste 、t y-2*Pste And t y-3*Pste These three groups. Therefore, in the embodiment of the present application, the "period" in the periodic partial sensing operation refers to a resource for performing partial sensing which is determined based on the interval Pstep. When it has only one group, it does not mean that other operations are performed. When it has a plurality of groups, it refers to the plurality of groups determined at intervals Pstep.
Alternatively, when Pstep has different values, then different Pstep is by t y-k*Pstep Different ones of the fractional sensing resources are determined. Optionally, the value of Pstep may be associated with the value and the number of values of k corresponding to Pstep. For example: pstep =5ms, then k =2, k =5. For exampleAnd Pstep =10ms, then k =1,2. For example, pstep =100ms, then k =1.
Alternatively, the partial sensing of the cycle may be before slot n or after slot n. The embodiment of the present application does not limit this.
In the following, a mode in which the terminal device performs partial sensing based on the period will be described by taking V2X communication as an example.
In the listening window, the terminal device detects SCIs transmitted by other devices, where the SCIs indicate at least one of the following information: and the time-frequency resource occupied by the corresponding data in the current time slot is reserved resource or sending period corresponding to 1 or 2 follow-up retransmissions. The terminal device can determine the resources respectively occupied or reserved by the transmission and the subsequent retransmission of the current data packet according to the occupied resources and the reserved resources. Further, in combination with the period indicated in the SCI, the resources occupied on the corresponding time-frequency resources in the subsequent period can also be determined. When the period continuously expands forwards, the resources occupied in the resource selection window in the future can be determined. For example, the resource occupied or reserved by another terminal device is detected by the terminal device as R (x, y), where x represents the frequency domain location and y represents the time domain location where the SCI is detected or the reserved location indicated by the current SCI. The terminal device may determine that all resources R (x, y + j × P) are resources reserved for the other terminal device, where j is a non-negative integer and P is the periodicity value indicated on the detected SCI. Accordingly, the terminal device can determine the resources occupied or reserved by other terminal devices on the sensing window and the resource selection window by combining the information, so that the resources can be excluded from the resource selection window. It should be understood that excluding resources in this application refers to not having certain resources as resources in the candidate set of resources and/or not having certain resources as resources for sidelink transmissions, unless specifically noted otherwise.
The short-term sensing, or short-term partial sensing or continuous partial sensing, refers to the terminal device sensing on all or part of time units in a period of time determined in the resource selection window and/or the sensing window in the present application. And the terminal device determines the candidate resources according to the sensing result. And a baseThe difference in the periodic partial sensing is that the short-term sensing resources are not determined at the preset interval Pstep, and only a time position is measured. Alternatively, as illustrated in FIG. 3, the short-time aware resource may be located after the time that resource selection is triggered and at t y Previously, therefore, short-time sensing does not need to be performed frequently, and only needs to be performed after triggering resource selection, so as to save power consumption. For example, the terminal device may obtain the reservation or occupation of the resource in the selection window by other terminal devices according to the short-term part perception in the selection window, thereby excluding the resource reserved and/or occupied by other terminal devices in the selection window.
Optionally, in the partial sensing, the terminal device may determine resource occupation information of the periodic service by using a periodic-based partial-sensing listening window, and/or listen to occupation information of the periodic or non-periodic service by using a short-time-sensing resource. The terminal device can obtain a complete monitoring result by combining the occupation information of the two parts of resources.
In addition, full sensing requires that the terminal device sense all resources within the listening window.
Optionally, both the partially-aware and fully-aware resource selection modes require the terminal device to have a sensing capability.
Still taking fig. 3 as an example, the sensing and resource selection process of the sending terminal device may include the following steps:
1. the transmitting terminal device receives SCIs from other terminal devices on the sensing resources, the SCIs including resource reservation information of the other terminal devices. Where n denotes a time at which the transmission terminal apparatus is triggered to perform resource selection. Further, the SCI is a first-level SCI (1 st-stage SCI) and is transmitted on the PSCCH. If partial sensing is adopted, the sensing resources here include sensing resources based on periodic partial sensing and/or sensing resources sensed for a short time, and if full sensing is adopted, the sensing resources may include all resources in the listening window.
As shown in fig. 3, the resource in the listening window may be a part of the resource in the resource pool determined according to the time n.
For example, the first transmission of the 3 transmissions is an initial transmission, the last two transmissions are retransmissions, or the 3 transmissions are all retransmissions. The sensing information included in the SCI includes time-frequency resource information of scheduling data of second and third retransmissions, periodic time-frequency resource information and data priority information which embody a data service period, and the like. It will be appreciated that at a given time instant, a terminal device will reserve resources (including time-frequency resources) subsequent to that time instant for retransmission of data and transmission of new periodic data by transmitting a SCI.
2. If the transmitting terminal device knows from the received sensing information of SCI from the terminal device 1, the time-frequency resource reserved by the terminal device 1 is located in the resource selection window [ n + T ] of the transmitting terminal device 1 ,n+T 2 ]And if so, the sending terminal device measures the data and/or the DMRS of the control channel that the terminal device 1 needs to send on the time-frequency resource according to the sensing information, so as to obtain an RSRP measurement value. If the RSRP measurement value is greater than the RSRP threshold, the transmitting terminal device is selected from the set S A And excluding the periodic reserved resource corresponding to the time-frequency resource.
In addition, if the terminal device does not sense the resource in the listening window for reasons such as half-duplex, the terminal device may select the set S according to the time domain position of the resource not sensed in the listening window and all periods in the set of service periods configured for the resource pool A Excluding resources.
Wherein the set S A The initialization state of (a) is a set of all candidate single slot resources in the resource selection window. The candidate single-slot resource refers to a time-frequency resource with the time domain length of 1 slot. S A Representing a candidate resource set whose initial state includes all candidate single-slot resources within a resource selection window.
3. The transmitting terminal device may determine available time-frequency resources among the remaining resources within the listening window after excluding the unavailable time-frequency resources within the listening window. So that the transmitting terminal apparatus selects a time-frequency resource from available time-frequency resources to transmit data.
4. Determining a set S A If the number of the remaining candidate single-slot resources is less than 0.2. M total Then in step 2, th (p) will be assigned for each priority i ) Adding 3dB, and repeating the steps 2 and 3 until the number of the remaining candidate single-slot resources reaches 0.2M total . Wherein M is total Total number of slot resources in all candidate lists in the resource selection window, or, M total The total number of resources within the resource selection window that can be used for the second terminal side row transmission is selected.
It should be understood that the above steps 1 to 4 are also referred to as a process of determining candidate resources, and the process of determining candidate resources in the present application may be implemented with reference to the above steps 1 to 4, or implemented in other ways.
Based on the above resource selection manner, in the existing mechanism, the time-frequency resource used by the sending terminal device when sending data is selected in the resource selection window based on the monitoring result of the sending terminal device in the resource monitoring window. The sensing result may be considered to be obtained on the basis of the listening result. In the technical solution provided in the embodiment of the present application, unless otherwise specified, the interception result includes a result determined through the above steps 1,2, and 3 or 1,2,3, and 4. The sensing result is the set of resources left after the resource exclusion. However, the transmitting terminal device does not know the channel conditions around the receiving terminal device. If there are other terminal apparatuses in the vicinity of the receiving terminal apparatus that are communicating but the transmitting terminal apparatus does not sense, the receiving terminal apparatus may receive strong interference from the sidelink communication of the other terminal apparatuses when receiving data from the transmitting terminal apparatus, resulting in poor signal reception quality of the receiving terminal apparatus and even reception failure.
(8) Priority of data
In this application, the priority of the data may be the priority of the service to which the data belongs. The priority of data expected to be transmitted is known to the transmitting-end terminal apparatus, for example, acquired from a higher layer. In addition, the terminal device can acquire the priority of the service transmitted by other terminal devices according to the priority information carried in the SCI. Optionally, the higher the service priority is, the more important the data in the data packet corresponding to the service to be transmitted is. Alternatively, a higher priority for a service indicates a higher quality of service (QoS) parameter requirement for the service. Wherein the QoS parameter of the service comprises at least one of the following: the reliability requirement of the service, the transmission delay requirement of the service, the transmission rate or the transmission throughput requirement of the service. Alternatively, the priority of the service may be negatively or positively correlated with the priority value indicated in the SCI. Taking negative correlation as an example, the smaller the priority value indicated in SCI, the more important the service is, otherwise, the larger the priority value is, the less important the service is. For example, the priority in SCI can be indicated by 3 bits, and its value can correspond to an integer from 1 to 8. When the SCI indication is 1, the service priority is higher; a SCI indication of 8 indicates a lower traffic priority.
Optionally, the priority of the data may be the priority of the TB to be sent, which is passed to the physical layer by the MAC layer. A TB of a service to be transmitted may include: at least one MAC control element and/or at least one logical channel. Optionally, each MAC control element corresponds to a priority, and each logical channel corresponds to a priority. Optionally, the highest priority in the at least one MAC control element and/or the at least one logical channel included in the service to be transmitted may be determined as the priority of the entire TB of the service to be transmitted.
(9) The signaling configuration, which may also be described in this application as configuration signaling.
In the present application, the signaling configuration includes signaling transmitted by the base station, and the signaling may be Radio Resource Control (RRC) message, downlink Control Information (DCI), or System Information Block (SIB). Optionally, the signaling configuration may also be configured to the terminal device by a preconfigured signaling, or configured to the terminal device in a preconfigured manner. The pre-configuration is that the value of the corresponding parameter is defined or configured in advance in a protocol mode and is stored in the terminal device when the terminal device is communicated. The preconfigured message may be modified or updated in the presence of the end device networking. Further optionally, the signaling configuration may limit the value or configuration information of the relevant parameter to the resource pool sent or received by the terminal device. The resource pool is a collection of resources used for transmission on a particular carrier or portion of bandwidth.
(10) DRX or SL-DRX
As shown in fig. 4, DRX refers to a sleep mode in which the terminal apparatus periodically repeats reception at a non-reception time and an operation mode in which reception is performed at a reception time. Here, the non-reception time or sleep time refers to: in one DRX cycle, a non-reception period (DRX off duration) or a non-reception duration in a time domain position, the terminal apparatus is in a non-reception state or a sleep state. Here, the reception time means: the terminal apparatus is in a reception state at a reception period (DRX on duration) or reception duration in a time domain position on one DRX cycle. One non-reception time and reception time may be collectively referred to as a DRX cycle (DRX cycle). The terminal device at the non-reception time does not perform sensing, or the terminal device does not determine the candidate resource according to the sensing result. The terminal device at the receiving time may perform sensing, or the terminal device may determine the candidate resource according to the sensing result. It should be understood that the DRX cycle may be configured by DRX configuration information or other signaling.
Generally, the configuration of DRX is determined based on the traffic characteristics between the transmitting and receiving UEs on sidelink. For example, based on information such as the periodicity, priority, or reliability requirements of the traffic. For example, if the cycle of the traffic transmitted by the terminal device 1 is 100ms and the transmission duration of the traffic is 10ms, the configuration of the DRX for reception by the terminal device 2 may be aligned with the cycle and the transmission duration of the traffic transmitted by the terminal device 1. Under this condition, the terminal apparatus 2 needs to receive only 10% of the time, and the rest 90% of the time can be powered off to sleep. Therefore, the receiving power consumption of the terminal device 2 can be saved to the maximum extent under the condition of not influencing the service receiving.
An ideal DRX configuration (including the cycle and the reception time and the sleep time within the cycle) is determined only based on the traffic characteristics of the transmitting-end terminal apparatus. In individual cases, coordination may also be performed according to a plurality of parallel to-be-received services of the receiving end terminal device. Even so, the configuration of DRX is mainly determined based on the traffic transmitted between terminal apparatuses. And it can be understood that the configuration information of DRX may be interacted or shared between the terminal apparatuses communicating with each other.
If discontinuous reception and a part of sensing mechanisms coexist, the receiving end terminal device originally needs to sense the resources within the non-reception time, which may have adverse effect on the result of resource selection. Therefore, when the functions of discontinuous reception and partial sensing are used (or configured or activated) together (or simultaneously), it is necessary to consider that the effect of selecting resources when performing partial sensing is not reduced as much as possible under the condition that the power consumption of the terminal device is reduced as much as possible, so as to achieve the purpose of minimizing the influence on the communication performance of the system. However, at present, a scheme for enabling the discontinuous reception and the partial sensing mechanism of the terminal device to effectively coexist still remains to be studied, because under the condition that the discontinuous reception and the partial sensing mechanism coexist, it is difficult for the terminal device to effectively obtain the energy saving effect of the two mechanisms, or the combination of the two mechanisms may have a great influence on the resource selection result of the terminal device, resulting in the decrease of the communication quality of the sidelink.
The embodiment of the present application provides a communication method, which is used for providing a solution for coexistence of discontinuous reception and partial sensing, and enabling a terminal device to obtain an energy saving effect brought by two mechanisms of discontinuous reception and partial sensing on the premise of ensuring that the communication performance of a sidelink of the terminal device is not greatly affected.
The communication method may be implemented by a first terminal device, wherein the first terminal device is a transmitting terminal device in sidelink communication. The first terminal device may determine a candidate resource according to the communication method provided in the embodiments of the present application, and transmit sidelink data (or simply referred to as data) to the second terminal device according to the candidate resource. The second terminal device in the present application may refer to a receiving-end terminal device in sidelink communication.
As shown in fig. 5 and fig. 6, are schematic structural diagrams of a terminal device provided in the embodiment of the present application, configured to implement the communication method provided in the embodiment of the present application.
Fig. 5 shows a schematic diagram of a possible terminal device structure, which may include a processing module (or processing unit) 510 and a transceiver module (or processing unit) 520. For example, the structure shown in fig. 5 may be a terminal device, and may also be a chip applied in the terminal device, or other combined device, component (or assembly) having the functions of the terminal device shown in this application. When the structure is a terminal device, the transceiver module 520 may be a transceiver, the transceiver may include an antenna and a radio frequency circuit, etc., and the processing module 510 may be a processor, such as a baseband processor, and one or more Central Processing Units (CPUs) may be included in the baseband processor. When the structure is a component having the functions of the terminal device shown in this application, the transceiver module 520 may be a radio frequency unit, and the processing module 510 may be a processor, such as a baseband processor. When the structure is a chip system, the transceiver module 520 may be an input/output interface of a chip (e.g., a baseband chip), and the processing module 510 may be a processor of the chip system, and may include one or more central processing units. It should be understood that the processing module 510 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 520 may be implemented by a transceiver or a transceiver-related circuit component.
For example, the processing module 510 may be configured to perform all operations performed by the first terminal device in any of the embodiments of the present application, such as processing operations, and/or other processes for supporting the techniques described herein, such as generating messages, information, and/or signaling for transmission by the transceiving module 520 and processing messages, information, and/or signaling received by the transceiving module 520. The transceiver module 520 may be used to perform all of the receiving and transmitting operations performed by the first terminal device in any of the embodiments of the present application, and/or to support other processes of the techniques described herein, such as the transmission and/or reception of data.
In addition, the transceiver module 520 may be a functional module that can perform both the transmitting operation and the receiving operation, for example, the transceiver module 520 may be configured to perform all the transmitting operation and the receiving operation performed by the relay node and/or the remote node, for example, when performing the transmitting operation, the transceiver module 520 may be considered as a transmitting module, and when performing the receiving operation, the transceiver module 520 may be considered as a receiving module; alternatively, the transceiver module 520 may also be two functional modules, and the transceiver module 520 may be regarded as a general term for the two functional modules, which are respectively a transmitting module and a receiving module, where the transmitting module is configured to complete a transmitting operation, for example, the transmitting module may be configured to perform all transmitting operations performed by the first terminal device, the receiving module is configured to complete a receiving operation, and the receiving module may be configured to perform all receiving operations performed by the relay node and/or the remote node.
Fig. 6 shows a schematic structural diagram of another terminal device, which is used to execute the actions performed by the first terminal device according to the embodiment of the present application. For ease of understanding and illustration. As shown in fig. 6, the terminal device may include a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing a communication protocol and communication data, controlling the terminal device, executing a software program, processing data of the software program, and the like. The memory is primarily used for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by users and outputting data to the users. It should be noted that some kinds of terminal devices may not have an input/output device.
When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is transmitted to the terminal device, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 6. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.
In the embodiment of the present application, the antenna and the rf circuit having the transceiving function may be regarded as a transceiving unit of the terminal device (the transceiving unit may be a single functional unit, and the functional unit is capable of implementing a transmitting function and a receiving function, or the transceiving unit may also include two functional units, that is, a receiving unit capable of implementing a receiving function and a transmitting unit capable of implementing a transmitting function, respectively), and the processor having the processing function may be regarded as a processing unit of the terminal device. As shown in fig. 6, the terminal apparatus includes a transceiving unit 610 and a processing unit 620. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Optionally, a device for implementing a receiving function in the transceiver unit 610 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiver unit 610 may be regarded as a transmitting unit, that is, the transceiver unit 610 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiver circuit, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.
It is understood that the transceiving unit 610 may correspond to the transceiving module 520, or the transceiving module 520 may be implemented by the transceiving unit 610. The transceiving unit 610 is configured to perform transmit and receive operations for the first terminal device in the embodiments illustrated herein, and/or other processes to support the techniques described herein. The processing unit 620 may correspond to the processing module 510, or the processing module 510 may be implemented by the processing unit 620. The processing unit 620 is configured to perform other operations of the first terminal device in the embodiments shown in this application, such as performing all operations performed by the first terminal device in the embodiments shown in this application except for receiving and transmitting, and/or other processes for supporting the techniques described herein.
It should be understood that the communication method provided by the embodiment of the present application may be implemented by the first terminal device. The first terminal device may be a transmitting terminal device or a component in a transmitting terminal device, and configured to perform sidelink transmission to the second terminal device. The second terminal device may act as the receiving terminal device or as a component in the receiving terminal device.
The structure of the first terminal device is shown in fig. 5 and/or fig. 6. The transceiving module 520 and/or the transceiving unit 610 may be configured to perform a transmitting and/or receiving operation performed by the first terminal device in the communication method. The processing module 510 and/or the processing unit 620 may be adapted to perform the processing operations performed by the first terminal device in the communication method and/or all operations except receiving and transmitting.
As shown in fig. 7, a communication method provided in an embodiment of the present application may include the following steps:
s101: the first terminal device determines a candidate resource according to at least one of the DRX configuration information, the first resource or the second resource.
The first resource and the second resource are periodically spaced partial sensing resources or continuously distributed partial sensing resources respectively. The periodically spaced partial sensing resources are resources for periodic partial sensing, for example, a plurality of candidate sensing resource subsets distributed at intervals Pstep in a listening window. Continuously distributed partially aware resources, i.e. resources for short-time partial sensing, such as the short-time sensing resources shown in fig. 3.
The DRX configuration information is used to determine a reception time and a non-reception time. The DRX configuration information herein may be DRX configuration information of the first terminal apparatus and/or DRX configuration information of the second terminal apparatus, and the application is not particularly limited. The DRX configuration information may specifically be used to configure one or more of a DRX cycle, a DRX start time, a DRX accepted duration, or a DRX non-accepted duration. The DRX receiving duration is the time domain length of the DRX receiving duration, and the DRX non-receiving duration is the time domain length of the DRX non-receiving duration.
In this application, the determining, by the first terminal device, the candidate resource according to at least one of the DRX configuration information and the first resource or the second resource includes determining, by the first terminal device, the candidate resource according to the first resource and/or the second resource according to at least one of the DRX configuration information and the first resource or the second resource, and determining the candidate resource according to the first resource and/or the second resource. Or, the first terminal device determines the candidate resource according to at least one of the DRX configuration information, the first resource, or the second resource, including the first terminal device determining the candidate resource through random resource selection according to at least one of the DRX configuration information, the first resource, or the second resource.
Determining the candidate resource according to the first resource and/or the second resource means that the first terminal device determines the candidate resource according to a sensing result obtained by sensing the first resource and/or a sensing result obtained by sensing the second resource.
Optionally, the first resource is a part of sensing resources at periodic intervals, and the second resource is a part of sensing resources distributed continuously. Or the first resource is a part of sensing resources which are distributed continuously, and the second resource is a part of sensing resources which are arranged at periodic intervals.
It should be appreciated that the candidate resource may be a resource in a set of candidate resources that the physical layer of the first terminal device reports to the MAC layer.
S102: the first terminal device transmits the first packet according to the candidate resource.
Wherein the first data packet is receivable by the second terminal device.
Optionally, in this embodiment, the second terminal device may be a certain receiving device of the first terminal device; or may be a group of receiving apparatuses under multicast by the first terminal apparatus; one or more receiving apparatuses that do not limit a specific receiving object may also be used, which is not limited in the embodiments of the present application.
Optionally, the first terminal device may send the first data packet through some or all of the candidate resources.
Optionally, the first terminal device may send the first data packet through a resource located at the receiving time of the second terminal device in the candidate resource, or the candidate resource is located at the receiving time of the second terminal device, so as to ensure that the sent data can be received by the second terminal device, thereby improving communication reliability.
With the above flow shown in fig. 7, the first terminal device considers DRX configuration and partial sensing resources in the process of determining candidate resources, which provides possibility for coexistence of the DRX mechanism and the partial sensing mechanism, so that the terminal device can improve the quality of sidelink communication of the first terminal device while enjoying the energy saving effect brought by the discontinuous reception mechanism and the partial sensing mechanism.
Alternatively, if the first terminal device is configured with the first resource and the second resource, the first terminal device may determine the candidate resource according to the first resource when the first condition is satisfied. At this time, the first terminal device may not sense the second resource, so as to further save power consumption. Wherein the first resource and the second resource may be one of periodically spaced partial sensing resources or continuously distributed partial sensing resources, respectively. Wherein the first condition comprises: the second resource is located at a non-reception time and/or part or all of the first resource is located at a reception time. If the second resource is a part of the sensing resource at periodic intervals, the second resource being located at the non-receiving time may refer to all resources in the listening window of the first terminal device being located at the non-receiving time.
It should be understood that, unless specifically stated otherwise, the fact that a resource is located at a non-reception time means that a starting position and an ending position of the resource are both within the same non-reception time, or all time domain positions of the resource belong to the non-reception time, or all time domain positions of the resource do not belong to the reception time. Similarly, the fact that the resource is located at the receiving time means that the starting position and the ending position of the resource are both within the same receiving time, or all time domain positions of the resource belong to the receiving time, or all time domain positions of the resource do not belong to the non-receiving time.
Taking the first resource as a part of the sensing resources at periodic intervals and the second resource as a part of the sensing resources distributed continuously as an example, for example, as shown in fig. 8, when the part of the sensing resources distributed continuously is located in the non-receiving time of the first terminal device, and/or a part or all of the part of the sensing resources at periodic intervals is located in the receiving time of the first terminal device, the first terminal device may determine the candidate resource according to the part of the sensing resources at periodic intervals. The first terminal device may determine the candidate resource according to a sensing result of the partial sensing resource located at the periodic interval within the receiving time.
Optionally, if the second resource is a part of sensing resources that are continuously distributed, when the first condition is satisfied, the process of determining the candidate resource by the first terminal device does not consider the sensing result of the second resource, or the first terminal device may not sense the second resource when the first condition is satisfied. Optionally, the first terminal device is configured with the second resource, but when the candidate resource is not determined by using the sensing result of the second resource, the first terminal device may perform re-evaluation or preemption evaluation on the determined candidate resource. Optionally, re-evaluation refers to a process of re-checking the determined resources before transmission. Preemption assessment refers to the process of checking the resources reserved for a previous transmission after initiation of the transmission, before making a further new transmission.
Also in the example shown in fig. 8, if the first resource is a periodically spaced apart partial sensing resource and M time units in the periodically spaced apart partial sensing resource are located within the non-reception time, the candidate resources determined by the first terminal device do not include the resources associated with the M time units in the selection window. In this application, a time unit may be a slot, a symbol, a combination of multiple slots or symbols, and the like, and M is a positive integer. Alternatively, the first terminal device excludes resources in the selection window associated with the M time units. Here, the resource associated with M time unit intervals refers to a resource with M transmission periods P, where M is a positive integer. For example, if i is an index of any time cell among M time cells, i =1,2 \8230, 8230, and M, the time cell with the index (i + M × P) is not included in the candidate resource. Optionally, P is a transmission period value configured on a resource pool where the first terminal device is located.
Optionally, if the first resource is a part of sensing resources at periodic intervals, and a part or all of the sensing resources in the first resource are located at the non-reception time of the first terminal device, in S103, the first terminal device may determine a candidate resource according to a sensing result of the third resource. The third resource is one or more groups of sensing resources closest to the first time, and the first time may be a time for triggering resource selection. Optionally, part or all of the third resource is located in the sensing window. The one or more groups of sensing resources belong to a subset of candidate sensing resources determined according to the step size Pstep. Optionally, part or all of the third resource may be located within the receiving time of the second communication device, so as to further improve the quality of the sidelink communication.
Taking FIG. 9 as an example, if the first resource includes t shown in FIG. 9 y-2Pstep And does not include t y-Pstep Wherein, t y-Pstep For a set of sensing resources closest to the time of triggering the selection of candidate resources, then at t y-2Pstep When the first terminal device is located in the non-receiving time of the first terminal device, the first terminal device can be used for t y-Pstep Sensing is carried out, and candidate resources are determined according to sensing results. Alternatively, the first terminal device may not respond to t y-2Pstep Sensing is performed to reduce power consumption.
Optionally, if the first resource is a part of sensing resources that are continuously distributed, and the second resource is a part of sensing resources at periodic intervals, the first terminal device may determine the candidate resource according to the part of sensing resources that are continuously distributed when the part of sensing resources at periodic intervals is located in the non-receiving time of the first terminal device, and/or when part or all of the part of sensing resources that are continuously distributed are located in the receiving time of the first terminal device. The first terminal device may determine the candidate resource according to a sensing result of the continuously distributed part of sensing resources within the receiving time.
As shown in fig. 10, when all the continuously distributed partial sensing resources are located within the receiving time of the first terminal device, the first terminal device may determine the candidate resource according to the sensing result of the continuously distributed partial sensing resources.
In addition, if part or all of the first resources are located within the reception time, or if the first resources are located at the non-reception time and the second condition is satisfied, the first terminal device may determine a candidate resource from at least part or all of the first resources in S101. Wherein the first resource may be a periodically spaced partial sensing resource or a continuously distributed partial sensing resource. In this case, even if the first resource is located at the non-reception time, the first terminal device may still sense some or all of the first resource, and determine the candidate resource according to the sensing result, so as to improve the validity of the candidate resource determination and the reliability of the transmission.
Wherein the second condition comprises at least one of the following conditions:
condition 1 is that the first terminal device receives a negative acknowledgement or does not receive a positive acknowledgement of the second packet. And the second data packet is a data packet sent before the first data packet. The second data packet is a data packet transmitted by the first terminal device before transmitting the first data packet (or before triggering resource selection for the first data packet). For example, the first data packet and the second data packet are both retransmission data packets of the same initial transmission data packet, and the transmission of the second data packet is before the transmission of the first data packet; alternatively, the first and second packets are each different packets, and the transmission of the second packet precedes the transmission of the first packet. The negative acknowledgement (or lack of receipt of a positive acknowledgement) may indicate that the second data packet was received unsuccessfully, which may be due to poor channel quality of the candidate resource previously determined by the first terminal device, and therefore, when selecting the resource for the first data packet, it is necessary to improve the sensing accuracy to improve the communication quality. At this time, the first terminal device may sense the first resource and determine the candidate resource according to a sensing result.
In condition 2, the priority of the first packet is not lower than the first threshold. If the priority of the data packet transmitted by the first terminal device is higher, the first terminal device can sense the first resource and determine the candidate resource according to the sensing result, so that the effectiveness of resource selection is improved, and the reliable transmission of the first data packet is ensured. Wherein the first threshold may be a value of a signaling configuration.
And in the condition 3, the channel state parameter value of the resource pool where the candidate resource is located is not lower than the second threshold. The channel state parameter value here includes, but is not limited to, CBR, CR, RSRP, RSSI, or the like of the resource in the resource pool obtained by the first terminal device. When the parameter values are high, the channel state of the resource in the resource pool of the first terminal device is not good, and at this time, the first terminal device can sense the first resource and determine the candidate resource according to the sensing result, so that the effectiveness of resource selection is improved, and the transmission reliability of the first data packet is ensured. Wherein the second threshold may be a value of a signaling configuration.
Conditional 4, the first terminal device is configured (or activated or enabled) to re-evaluate or preempt evaluation. If the first terminal device is configured with the re-evaluation or the preemption evaluation, it indicates that the first terminal device needs to ensure the reliability of the sidelink communication through the re-evaluation or the preemption evaluation, that is, the transmission of the first data packet has a certain requirement on the quality of the sidelink communication. At this time, the first terminal device can sense the first resource and determine the candidate resource according to the sensing result, so as to improve the effectiveness of resource selection and ensure the reliable transmission of the first data packet.
And in condition 5, the first terminal device receives first indication information, where the first indication information is used to indicate that the first terminal device determines the candidate resource according to at least a sensing result corresponding to the first resource when the first resource is located at the non-reception time. When the condition is satisfied, the first terminal device may perform determination of the candidate resource based on the first indication information, that is, upon receiving the first indication information, the first terminal device may perceive the first resource even if the first resource is located at the non-reception time, and determine the candidate resource according to a result of the perception.
Therefore, when any of the above second conditions is satisfied, the first terminal device still needs to sense the first resource, and determine the candidate resource according to the sensing result of the first resource. Compared with the scheme of determining the candidate resources when the first condition is met, the first terminal device at least needs to determine the candidate resources according to the sensing result of the first resources when the second condition is met, the effectiveness of candidate resource selection can be improved, and the communication quality of the side link is further improved.
For example, when the first resource is located at the non-reception time and the second condition is satisfied, the second terminal device may determine the candidate resource according to the first resource and the second resource, that is, the first terminal device may determine the candidate resource according to a sensing result of the first resource and a sensing result of the second resource, so as to further improve the sidelink communication quality.
Taking the first resource as a continuously distributed partial sensing resource and the second resource as a periodically spaced partial sensing resource as an example, if the continuously distributed partial sensing resource determined by the first terminal device is located within the non-reception time of the first terminal device and meets the second condition, the first terminal device may determine the candidate resource according to the sensing result of the continuously distributed partial sensing resource. When the first resource is a periodically spaced partial sensing resource and the second resource is a continuously distributed partial sensing resource, if the continuously distributed partial sensing resource determined by the first terminal device is located in the non-reception time of the first terminal device and meets the second condition, the first terminal device may sense the partial sensing resource in the first resource and determine a candidate resource according to a sensing result, where the partial sensing resource in the first resource is, for example, one or more groups of sensing resources in the first resource.
Similarly, if part or all of the second resources are located within the reception time, or if the second resources are located at the non-reception time and the second condition is satisfied, the first terminal device may determine the candidate resources at least according to part or all of the second resources in S101. Wherein the second resource may be a periodically spaced partial sensing resource or a continuously distributed partial sensing resource.
In another possible implementation manner of S101, if part or all of the first resources are located within the non-reception time of the first terminal device and part or all of the second resources are located within the non-reception time of the first terminal device, in S101, the first terminal device may determine candidate resources through random resource selection to reduce the perceptually generated power consumption.
For example, the first resource is a part of sensing resources at periodic intervals as shown in fig. 11, the second resource is a part of sensing resources distributed continuously as shown in fig. 11, and the first terminal device may determine the candidate resource through random resource selection because the first resource and the second resource are located in the non-reception time of the first device.
Optionally, in S101, if part or all of the first resources are located within the non-reception time of the first terminal device and the second condition is satisfied, in S101, the first terminal device may determine candidate resources according to the first resources and/or the second resources, so as to improve the communication quality. When the aforementioned second condition is satisfied, the method for determining the candidate resource according to the first resource and/or the second resource may refer to the method for determining the candidate resource according to the first resource and/or determining the candidate resource according to the second resource, and the method is not repeatedly expanded here.
It should be understood that, for the case that part or all of the resources of the first resource are located in the non-reception time of the first terminal device, the first indication information may be used to indicate that the first terminal device determines the candidate resource according to the sensing result corresponding to the first resource and/or the second resource when part or all of the resources of the first resource are located in the non-reception time of the first terminal device.
Alternatively, in S101, if part or all of the first resources are located within the receiving time of the first terminal device and part or all of the second resources are located within the receiving time of the first terminal device, the first terminal device may determine candidate resources according to the first resources and the second resources.
In this application, if the first terminal device determines the candidate resource according to the first resource and the second resource, the first terminal device may determine the candidate resource at least according to the fourth resource in the selection window. Wherein the fourth resource is at least one set of continuously distributed partially-aware resources that are not coincident with the first resource and the second resource. Or, the fourth resource is a part of the first resource and/or the second resource in the selection window. Therefore, the candidate resource can be determined more accurately by determining the candidate resource according to the fourth resource, and the communication quality of the sidelink can be further improved. Optionally, the first terminal device may determine the candidate resource according to the first resource, the second resource and the fourth resource.
It should be understood that, in the present application, the determination of the candidate resource according to the fourth resource may be that the first terminal device determines a second candidate resource subset according to the fourth resource and the first candidate resource subset on the basis of the determination of the first candidate resource subset according to the first resource and the second resource, and the second candidate resource subset is taken as a result of the resource selection (i.e. as a candidate resource). Such as a process of determining a second subset of candidate resources. For example, the first terminal device may exclude resources whose sensing result of the fourth resource is occupied from the first candidate resource subset according to the sensing result of the fourth resource, and/or add resources whose sensing result of the fourth resource is unoccupied to the first candidate resource subset. Alternatively, the first terminal device may determine the candidate resources according to the first resource, the second resource, and the fourth resource, respectively, without determining the first candidate resource subset and then determining the second candidate resource subset, which is not specifically limited in this application.
As shown in FIG. 12, the first resource is a continuously distributed partial sensing resource, which can be denoted as STS1, and the second resource is a periodically spaced partial sensing resource, including but not limited to t shown in FIG. 12 y-2Pstep And t y-Pstep The fourth resource may be STS2 shown in FIG. 11, and the time domain position is [ n + T ] c ,n+T d ]. Wherein the number and/or size (or T) of the fourth resource c And/or T d Value of) may be configured or predefined.
In an implementation, optionally, the fourth resource may be determined according to a reception time of the second terminal device, so as to improve effectiveness of resource selection. For example, the time domain position of the fourth resource is located Tu time slots before the start time (or the time slot in which the start time is located) of the reception time of the second terminal device. Tu may be a signaling configuration or a predefined value. For example, tu may take the value of 0 slot, 1 slot, or 2 slots. Or, optionally, tu may be a value between 0 and 32 slots. The time before the start of the reception time of the second terminal device is to ensure that the first terminal device has enough time to determine a suitable candidate resource by the STS2 before the second terminal device starts reception.
Alternatively, the first terminal device may determine the candidate resource at least from the fourth resource when the following fourth condition is satisfied. Wherein, the fourth condition includes: the candidate resource determined according to the first resource and the second resource includes K resource units, where K is less than or equal to a third threshold, where the third threshold is determined according to one or more information of the number of resource units required for N transmissions of the first packet (including initial transmission and/or retransmission of the first packet), a channel state parameter value of a resource pool of the first terminal device, a priority of the first packet, configuration signaling, or a predefined value. The channel state parameter value here is, for example, any one or more of a channel busy ratio, a channel occupied ratio, RSRP, RSSI, or the like.
Alternatively, if in S102, the first terminal device determines the multiple sets of candidate resource subsets according to the sensing result of the first resource and the sensing result of the second resource, the fourth resource may include multiple sets of subsets. Optionally, each subset is a set of contiguously distributed partial perceptual resources. Optionally, the fourth resource includes a second sensing resource determined by the periodically spaced partial sensing resources in the selection window, and a continuously distributed partial sensing resource before the second sensing resource. For example, the time domain position of the subset of the ith group of fourth resources is located after the time domain position of the ith group of candidate resource subsets and/or is located before the time domain position of the (i + 1) th group of candidate resource subsets. Further, the first terminal device may determine the candidate resource according to the sensing result of each fourth resource subset. For example, a total set of candidate resource subsets determined according to the sensing result of the first resource and the sensing result of the second resource is used as the candidate resource. Wherein the number of subsets of the fourth resources and/or the size of the subsets may be configured or predefined by signaling.
For example, in fig. 13, the first resource is a continuously distributed partial sensing resource, and the second resource is a periodically spaced partial sensing resource, including but not limited to t shown in fig. 13 y-2Pstep And t y-Pstep The subset of candidate resources in the resource selection window determined according to the second resource comprises t y 、t y+Pstep ……t y+p*Pstep . The fourth resource at this time may include a fourth resource subset #1, a fourth resource subset #2 (not shown in fig. 13) \8230; and a fourth resource subset # p, where j =1,2 \8230; \8230, p are positive integers. Illustratively, the fourth resource subset # j is located at t y+j*Pstep Before and at t y+(j-1)*Pstep And then.
Optionally, when determining the candidate resource according to the first resource, the second resource and the fourth resource, the first terminal device may determine that the subset of the candidate resource includes t according to the second resource y 、t y+Pstep ……t y+p*Pstep According to the perception results of the first resource, the fourth resource subset #1, the fourth resource subset #2 \8230, the fourth resource subset # 8230, and the fourth resource subset # p respectively, t is further excluded y 、t y+Pstep ……t y+p*Pstep Of (2). Alternatively, in fig. 13, each subset of candidate resources and each subset of fourth resources are located within the reception time of the second terminal device.
It should be understood that, if the service described in the first data packet is a periodic service, the first terminal device may periodically transmit the data packet of the service according to the candidate resource determined in the embodiment of the present application and the service period of the service. The first terminal device can perform preemption evaluation in each transmission so as to improve the communication quality of the sidelink.
In performing preemption evaluation, the first terminal device may perform preemption evaluation if the first terminal device is still at non-reception time, otherwise the first terminal device may not perform preemption evaluation if the fifth condition is satisfied. The fifth condition may include at least one of the foregoing conditions 1 to 4 or 6. Wherein, the conditions 1 to 4 can be referred to the above description. Condition 6 includes: and the first terminal device receives second indication information, wherein the second indication information is used for indicating that when the perception resource subjected to the preemptive evaluation is located at the non-receiving time, the first terminal device determines the candidate resource at least according to the perception result corresponding to the perception resource subjected to the preemptive evaluation.
It should be understood that, in the present application, the manner in which the first terminal device determines the candidate resource according to the continuously distributed partial sensing resources includes: a timer, such as an inactive-timer, is executed, and a start-stop time for at least one of the sensing, re-evaluating, or preempting evaluating is determined based on the timer count. Optionally, the start and end time of the timer is before the first candidate resource set. The first candidate resource may be a set of candidate resources determined from periodic partially-aware resources and/or periodic resources used for preemption evaluation.
It should also be understood that, in the present application, when the first terminal apparatus is originally in the non-reception state, but the first terminal apparatus performs a reception operation (such as a reception operation in perception) because the conditions provided in the embodiments of the present application are satisfied, the time at which the first terminal apparatus starts performing the reception operation and the time at which the first terminal apparatus ends the reception operation may be maintained using a timer during the non-reception time. Alternatively, the start time and the end time for performing the receiving operation may be determined by the count start time of the started timer and the technology expiration time.
Optionally, the size of the timer (or the value of the start time or the value of the end time) in this embodiment is configured by signaling on the resource pool, and this size may be associated with the priority of sending the data packet or the signal quality of the resource pool. Optionally, the signal quality at the guides may be one or more of CBR, CR, RSSI, or RSRP.
As shown in fig. 14, the embodiment of the present application further provides another communication method for reducing power consumption of a terminal apparatus that performs sidelink communication. The method may be implemented by a first terminal device and a network apparatus.
S201: the first terminal device determines the resources of the first time slot for signal quality measurement according to the first information.
Wherein the first information indicates that the first terminal device performs the energy saving operation and/or is used for indicating the resource. The power saving operation may be DRX, power saving resource selection, or discontinuous transmission in this application. The energy-efficient resource selection manner may include partially-aware resource selection, or resource selection based on the configured scheduling type 1, or resource selection based on the configured scheduling type 2. Whether or not to perform the power saving operation may be configured according to the resource pools of the first terminal device, for example, the first terminal device may perform the power saving operation in some resource pools and not perform the power saving operation in other resource pools. Thereby achieving a further reduction of unnecessary power consumption in supporting the terminal device in the measurement.
The first information is configured by signaling and can come from a network device (such as a base station); alternatively, it may be determined in a preconfigured manner. Accordingly, the network device may be operable to determine and transmit the first information. The first information may be transmitted in a unicast mode, a multicast mode or a broadcast mode.
Optionally, the signal quality includes RSRP and/or RSSI.
The resource may be part or all of a symbol occupied by the DMRS in the control channel in the first slot, and/or part or all of a symbol occupied by the DMRS in the data channel in the first slot. It should be understood that the control channel in this application includes the PSCCH and the data channel includes the PSCCH.
In the present application, as shown in fig. 15 and 16, the DMRS may be located on symbols occupied by the PSCCH and/or on symbols occupied by the PSCCH scheduled by the PSCCH. Wherein the symbols occupied by the PSSCH scheduled by the PSCCH comprise at least one symbol in the slot that is located after the PSCCH and before a gap symbol. In fig. 15 and 16, an Automatic Gain Control (AGC) symbol is further included for carrying AGC information for causing the receiving terminal apparatus to adjust the strength of the received signal to a strength required for accurate decoding, and may be located in a symbol occupied by the PSCCH scheduled by the PSCCH.
Optionally, the resource used for measuring the signal quality includes a resource occupied by a DMRS of a control channel in the time slot, and/or a resource occupied by a DMRS of a data channel on a symbol occupied by the control channel in the time slot.
Optionally, the resource for measuring the signal quality does not include the first symbol in the slot for performing the AGC operation.
S202: the first terminal device makes a measurement of the signal quality on the resource.
Optionally, the first terminal device may measure the signal quality on the resource occupied by the DMRS in the control channel and/or the data channel in the first time slot.
Specifically, if the size of the subchannel of the data channel indicated by the control channel in the first slot is smaller than 20 PRBs, the first terminal device may perform measurement of the signal quality on the resource occupied by the DMRS of the control channel in the first slot. The data channel indicated by the control channel may also be replaced by the data channel indicated by the control channel SCI. In this case, the first terminal apparatus may not measure the signal quality on the resource occupied by the DMRS of the data channel, thereby saving power consumption.
Conversely, if the size of the sub-channel of the data channel is greater than or equal to 20 PRBs, the first terminal device may perform the measurement of the signal quality on the resource occupied by the DMRS in the control channel and/or the data channel in the first slot, for example, the first terminal device may perform the measurement of the signal quality on the resource occupied by the DMRS in the control channel and/or the resource occupied by the DMRS in the control channel and the data channel may both perform the measurement of the signal quality, so as to improve the measurement accuracy.
In addition, if the signal quality includes RSSI, the resource is a symbol where the control channel is located in the first slot in the time domain, and is a frequency domain resource occupied by the control channel and the data channel on the symbol in the frequency domain. Therefore, the first terminal device can perform RSSI measurement on fewer resources to save power consumption. Optionally, in this way, the size of the sub-channel of the data channel is greater than or equal to 20 PRBs.
It should be understood that the above first information may be a configuration signaling for indicating that the method as described in fig. 7 and/or fig. 14 is allowed to be performed. The configuration signaling may be directly indicated or implicitly indicated by other signaling. For example, in case of performing the method shown in fig. 14, a field may be used to directly indicate to perform the method as shown in fig. 7 and/or fig. 14, and/or to indicate the first terminal device to perform power saving operation and/or to indicate the resources involved in the embodiment shown in fig. 14 for signal quality measurement, and accordingly, the first terminal device may perform processing of signal quality according to the method shown in fig. 14. In addition, without performing the method shown in fig. 14, a field may be used to directly instruct the first terminal device not to perform the method shown in fig. 7 and/or fig. 14, and/or to instruct the first terminal device not to perform the power saving operation, or may instruct the first terminal device to perform the signal quality measurement over the entire first time slot, and accordingly, the first terminal device does not perform the signal quality processing according to the method shown in fig. 14, or the first terminal device performs the signal quality measurement over the entire first time slot.
Based on the same inventive concept, the embodiment of the present application further provides a communication device for implementing the above function implemented by the first terminal device. The device may include the structure shown in fig. 5 and/or fig. 6.
Specifically, the transceiver module 520 and/or the transceiver unit 610 in fig. 5 may be configured to perform the actions shown in S102, and/or perform the receiving action performed by the first terminal device on the sensing resource in this application, and/or perform the receiving action on signals such as DMRS. The processing module 510 and/or the processing unit 620 may be configured to perform the actions shown in S101, S201, and S202, and/or perform resource selection actions other than reception actions performed on the sensing resources, and/or perform signal quality measurements based on received signals such as DMRS.
The embodiment of the application provides a communication system. The communication system may comprise the first terminal device and/or the second terminal device according to the above embodiments. Alternatively, the communication system may comprise the structure shown in any of fig. 1-2. The communication device may be used to implement the steps implemented by the first terminal device in the communication method shown in fig. 7 and/or fig. 14.
An embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is used to store a computer program, and when the computer program is executed by a computer, the computer may implement the flow related to the first terminal device in the embodiments shown in fig. 7 and/or fig. 14 and provided by the foregoing method embodiment.
Embodiments of the present application further provide a computer program product, where the computer program is used to store a computer program, and when the computer program is executed by a computer, the computer may implement the flow related to the first terminal device in the embodiments shown in fig. 7 and/or fig. 14 and provided by the foregoing method embodiments.
Embodiments of the present application also provide a chip or a chip system (or a circuit), where the chip may include a processor, and the processor may be configured to call a program or instructions in a memory, and perform the processes related to the first terminal device in the embodiments shown in fig. 7 and/or fig. 14 and provided by the foregoing method embodiments. The chip system may include the chip, and may also include other components such as memory or a transceiver.
It is understood that the processor in the embodiments of the present application may be a CPU, other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The general purpose processor may be a microprocessor, but may be any conventional processor.
The method steps in the embodiments of the present application may be implemented by hardware, or may be implemented by software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in random access memory, flash memory, read only memory, programmable read only memory, erasable programmable read only memory, electrically erasable programmable read only memory, registers, a hard disk, a removable hard disk, a 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. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a first terminal device. Of course, the processor and the storage medium may reside as discrete components in a network device or a terminal device.
In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, special purpose computer, computer network, network appliance, user equipment, or other programmable device. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire or wirelessly. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; optical media such as digital video disks; but may also be a semiconductor medium such as a solid state disk.
In the embodiments of the present application, unless otherwise specified or conflicting with respect to logic, the terms and/or descriptions in different embodiments have consistency and may be mutually cited, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logic relationship.
In this application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a alone, A and B together, and B alone, wherein A and B may be singular or plural. In the description of the text of the present application, the character "/" generally indicates that the former and latter associated objects are in an "or" relationship; in the formula of the present application, the character "/" indicates that the preceding and following related objects are in a relationship of "division".
It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for convenience of description and distinction and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the above processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the inherent logic.
Claims (28)
1. A method of communication, comprising:
the first terminal device determines a candidate resource according to at least one of the Discontinuous Reception (DRX) configuration information, the first resource or the second resource; the first resource is a part of sensing resources at periodic intervals, and the second resource is a part of sensing resources distributed continuously; or, the first resource is a part of sensing resources which are distributed continuously, and the second resource is a part of sensing resources which are periodically spaced; the DRX configuration information is used for determining receiving time and non-receiving time;
and the first terminal device transmits a first data packet according to the candidate resource.
2. The method of claim 1, wherein the first terminal device determining candidate resources from at least one of DRX configuration information, first resources, or second resources when a first condition is satisfied comprises:
the first terminal device determines candidate resources from the first resources, wherein the first condition comprises at least one of:
the second resource is located at the non-reception time; or,
the first resource is located at the receive time.
3. The method of claim 1, wherein the first resource is located at the non-reception time, and wherein the first terminal device determines candidate resources according to at least one of DRX configuration information, the first resource, or a second resource, comprising:
the first terminal device determines a candidate resource from at least the first resource when a second condition is satisfied.
4. The method of any of claims 1-3, wherein the first terminal device determining candidate resources from at least one of DRX configuration information, first resources, or second resources, comprises:
when the second resource is located at the receiving time, or when the second resource is located at the non-receiving time and a second condition is satisfied, the first terminal device determines a candidate resource at least according to a listening result of the second resource.
5. The method of claim 3 or 4, wherein the second condition comprises at least one of:
the first terminal device receives a negative acknowledgement of a second data packet, wherein the second data packet is a data packet transmitted before the first data packet; or,
the priority of the first data packet is not lower than a first threshold; or,
the channel state parameter value of the resource pool where the candidate resource is located is not lower than a second threshold; or,
the first terminal device is configured to perform re-evaluation or preemption evaluation; or,
the first resource is located at the non-receiving time, and the first terminal device receives first indication information, where the first indication information is used to indicate: and when the first resource is positioned at the non-receiving time, the first terminal device at least determines the candidate resource according to a sensing result corresponding to the first resource.
6. The method of any one of claims 1 to 3,
the first resource is a part of sensing resources at periodic intervals, the second resource is a part of sensing resources distributed continuously, a part or all of the first resource is located at the non-receiving time, and the first terminal device determines candidate resources according to at least one of DRX configuration information, the first resource or the second resource, including:
and the first terminal device determines candidate resources at least according to a monitoring result of third resources in a sensing window, wherein the third resources are one or more groups of monitoring resources closest to a first moment, and the first moment is a moment for triggering the first terminal device to determine the uplink resources.
7. The method of claim 6, wherein the DRX configuration is used to determine a receive time of the second terminal device, the one or more sets of monitored resources are located at the receive time of the second terminal device, and the second terminal device is a receive device for the first data packet.
8. The method of any of claims 1-3, wherein the first resource is a periodically spaced partial sensing resource and the second resource is a continuously distributed partial sensing resource;
when the M time units in the first resource are located at the non-receiving time, the candidate resource does not include the resource associated with the M time units in the selection window, and M is a positive integer.
9. The method of claim 1, wherein the first terminal device determining candidate resources from at least one of DRX configuration information, first resources, or second resources comprises:
the first terminal device determines the candidate resource according to a random selection manner when the following conditions are satisfied:
and part or all of the first resources and part or all of the second resources are located at the non-reception time.
10. The method of claim 1, wherein the first terminal device determining candidate resources from at least one of DRX configuration information, first resources, or second resources comprises:
the first resource and the second resource are located at a reception time determined by the DRX configuration, and the first terminal device determines a candidate resource according to the first resource and the second resource.
11. The method of any of claims 1-10, wherein the first terminal device determining candidate resources from at least one of DRX configuration information, first resources, or second resources, comprises:
the first terminal device determines the candidate resource at least according to L fourth resources in a selection window, wherein the fourth resources are partial sensing resources which are continuously distributed except the first resources and the second resources, and L is a positive integer.
12. The method of claim 10 or 11,
the candidate resources include K resource units, where K is less than or equal to a third threshold, where the third threshold is determined according to one or more of the following information, and K is a positive integer:
the number of resource units required by N transmissions of a first data packet, wherein N is a positive integer; or,
channel state parameter values on the resource pool; or,
a priority of the first data packet; or,
configuring signaling; or,
a predefined value.
13. A communication device, comprising a processing module and a transceiver module:
the transceiver module is used for the communication device to communicate;
the processing module is configured to execute, by the transceiver module:
determining a candidate resource according to at least one of the DRX configuration information, the first resource or the second resource; the first resource is a part of sensing resources at periodic intervals, and the second resource is a part of sensing resources distributed continuously; or, the first resource is a part of sensing resources which are distributed continuously, and the second resource is a part of sensing resources which are periodically spaced; the DRX configuration information is used for determining a receiving time and a non-receiving time;
and sending a first data packet according to the candidate resource.
14. The communications apparatus as claimed in claim 13, wherein when a first condition is satisfied, the processing module is specifically configured to:
determining a candidate resource from the first resource, wherein the first condition comprises at least one of:
the second resource is located at the non-reception time; or,
the first resource is located at the receive time.
15. The communications apparatus as claimed in claim 13, wherein the first resource is located at the non-reception time, and the processing module is specifically configured to:
and when a second condition is met, determining candidate resources according to at least the first resource.
16. The communication device according to any of claims 13 to 15, wherein the processing module is specifically configured to:
when the second resource is located at the receiving time, or when the second resource is located at the non-receiving time and a second condition is satisfied, the first terminal device determines a candidate resource at least according to a listening result of the second resource.
17. The communication apparatus according to claim 15 or 16, wherein the second condition comprises at least one of:
the first terminal device receives a negative response of a second data packet, wherein the second data packet is a data packet transmitted before the first data packet; or,
the priority of the first data packet is not lower than a first threshold; or,
the channel state parameter value of the resource pool where the candidate resource is located is not lower than a second threshold; or,
the first terminal device is configured to perform a re-evaluation or preemption evaluation; or,
the first resource is located at the non-receiving time, and the first terminal device receives first indication information, where the first indication information is used to indicate: and when the first resource is positioned at the non-receiving time, the first terminal device at least determines the candidate resource according to a sensing result corresponding to the first resource.
18. The communications apparatus as claimed in any of claims 13-15, wherein the first resource is a periodically spaced apart partial sensing resource, the second resource is a continuously distributed partial sensing resource, and part or all of the first resource is located at the non-reception time, and the processing module is specifically configured to:
and determining candidate resources at least according to a monitoring result of third resources in a sensing window, wherein the third resources are one or more groups of monitoring resources closest to a first moment, and the first moment is a moment for triggering the first terminal device to determine the uplink resources.
19. The communications apparatus of claim 18, wherein the DRX configuration is used to determine a receive time of the second terminal apparatus, the one or more sets of monitored resources are located at the receive time of the second terminal apparatus, and the second terminal apparatus is a receive apparatus of the first data packet.
20. A communication apparatus according to any one of claims 13-15, wherein the first resource is a periodically spaced partial sensing resource and the second resource is a continuously distributed partial sensing resource;
when M time units in the first resource are located at the non-receiving time, the candidate resource does not include resources associated with the M time units in a selection window, and M is a positive integer.
21. The communications apparatus as claimed in claim 13, wherein said processing module is specifically configured to:
determining the candidate resource according to a random selection mode when the following conditions are met:
and part or all of the resources of the first resources and part or all of the resources of the second resources are positioned at the non-receiving time.
22. The communications apparatus as claimed in claim 13, wherein said processing module is specifically configured to:
the first resource and the second resource are located at a reception time determined by the DRX configuration, and the first terminal device determines a candidate resource according to the first resource and the second resource.
23. The communication device according to any of claims 13 to 22, wherein the processing module is specifically configured to:
and determining the candidate resource at least according to L fourth resources in the selection window, wherein the fourth resources are part of sensing resources which are continuously distributed except the first resources and the second resources, and L is a positive integer.
24. The communication apparatus according to claim 22 or 23,
the candidate resources include K resource units, where K is less than or equal to a third threshold, where the third threshold is determined according to one or more of the following information, and K is a positive integer:
the number of resource units required by N transmissions of a first data packet, wherein N is a positive integer; or,
channel state parameter values on the resource pool; or,
a priority of the first packet; or,
configuring signaling; or,
a predefined value.
25. A terminal device comprising a processor coupled to at least one memory, the processor being configured to read a computer program stored in the at least one memory to perform the method of any one of claims 1 to 12.
26. A computer-readable storage medium, in which a computer program is stored which, when run on a computer, causes the computer to carry out the method according to any one of claims 1 to 12.
27. A computer program product, which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 12.
28. A chip comprising a processor and a communication interface, the processor being configured to read instructions to perform the method of any one of claims 1 to 12.
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| CN202110369478.1A CN115190454A (en) | 2021-04-06 | 2021-04-06 | Communication method and device |
| PCT/CN2022/072883 WO2022213705A1 (en) | 2021-04-06 | 2022-01-20 | Communication method and apparatus |
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| CN116567818A (en) * | 2023-07-04 | 2023-08-08 | 阿里巴巴（中国）有限公司 | Information sensing method, information processing method, information sensing equipment and information processing system |
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| US10757550B2 (en) * | 2016-04-07 | 2020-08-25 | Lg Electronics Inc. | Method for performing sensing during terminal-specific sensing period in wireless communication system, and terminal using same |
| KR102416290B1 (en) * | 2019-08-01 | 2022-07-05 | 아서스테크 컴퓨터 인코포레이션 | Method and apparatus for providing power saving of monitoring for device-to-device communication in a wireless communication system |
| US11678327B2 (en) * | 2019-08-15 | 2023-06-13 | Comcast Cable Communications, Llc | Sidelink communications |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116567818A (en) * | 2023-07-04 | 2023-08-08 | 阿里巴巴（中国）有限公司 | Information sensing method, information processing method, information sensing equipment and information processing system |
| CN116567818B (en) * | 2023-07-04 | 2023-11-17 | 阿里巴巴（中国）有限公司 | Information sensing method, information processing method, information sensing equipment and information processing system |
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