Communication method and communication device

Abstract

The invention provides a communication method and a communication device. The method comprises the following steps: terminal equipment determines parameters corresponding to a side positioning reference signal SL PRS according to a channel busy rate CBR and / or a channel occupancy rate CR; and the terminal equipment sends the SL PRS according to the parameters corresponding to the SL PRS. According to the method provided by the embodiment of the invention, the congestion control on the SL PRS can be realized.

Description

Communication method and communication device Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a communication method and a communication device. Background Art

[0002] In some communication systems, a sidelink positioning reference signal (SL PRS) is introduced to improve the positioning accuracy of terminal equipment. However, it is currently unclear how to perform congestion control on the SL PRS.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a communication method and a communication device. The following describes various aspects of the embodiments of the present application.

[0005] In a first aspect, a communication method is provided, including: a terminal device determines parameters corresponding to a side positioning reference signal SL PRS according to a channel busy rate CBR and / or a channel occupancy rate CR; and the terminal device sends the SL PRS according to the parameters corresponding to the SL PRS.

[0006] According to a second aspect, a communication device is provided, including: a determination unit for determining parameters corresponding to a side positioning reference signal SL PRS according to a channel busy rate CBR and / or a channel occupancy rate CR; and a sending unit for sending the SL PRS according to the parameters corresponding to the SL PRS.

[0007] In a third aspect, a communication device is provided, comprising a memory, a transceiver and a processor, wherein the memory is used to store programs, the processor sends and receives data through the transceiver, and the processor is used to call the program in the memory so that the communication device executes the method described in the first aspect.

[0008] In a fourth aspect, a communication device is provided, comprising a processor configured to call a program from a memory so that the communication device executes the method described in the first aspect.

[0009] In a fifth aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes the method described in the first aspect.

[0010] In a sixth aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method described in the first aspect.

[0011] In a seventh aspect, a computer program product is provided, comprising a program, wherein the program enables a computer to execute the method described in the first aspect.

[0012] In an eighth aspect, a computer program is provided, which enables a computer to execute the method described in the first aspect.

[0013] In an embodiment of the present application, the terminal device determines the parameters corresponding to the SL PRS according to the CBR and / or CR, and sends the SL PRS according to the parameters corresponding to the SL PRS, thereby achieving congestion control of the SL PRS. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is an example diagram of a wireless communication system used in an embodiment of the present application.

[0015] FIG2 is a schematic diagram showing that part of the symbols in a time slot are used for sidelink transmission.

[0016] FIG3 is a schematic diagram of the PSCCH and PSSCH time slot structure.

[0017] FIG4 is a schematic diagram of the time domain positions of four DMRS symbols in a 13-symbol PSSCH.

[0018] FIG5 is a schematic diagram of the frequency domain position of the PSSCH DMRS.

[0019] Figure 6 is a schematic diagram of the PSCCH and PSSCH resource pools in NR-V2X.

[0020] FIG7 is a schematic diagram of the time slot structure in the NR system.

[0021] Figure 8 is a schematic diagram of time domain resources in NR-V2X.

[0022] FIG9 is a schematic flowchart of a communication method provided in one embodiment of the present application.

[0023] FIG10 is a schematic diagram of REs occupied by the SL PRS in the frequency domain when the comb tooth size is 6.

[0024] FIG11 is a schematic diagram of REs occupied by an SL PRS in the frequency domain when the comb tooth size is 6 and the RE offset is 2. FIG.

[0025] FIG12 is a schematic diagram of SL PRS time domain resources within a time slot.

[0026] FIG13 is a schematic structural diagram of a communication device provided in one embodiment of the present application.

[0027] FIG14 is a schematic structural diagram of a device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solution in this application will be described below with reference to the accompanying drawings.

[0029] FIG1 illustrates a wireless communication system 100 used in an embodiment of the present application. The wireless communication system 100 may include a network device 110 and a user equipment (UE) 120. The network device 110 may communicate with the UE 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the UE 120 within the coverage area. The UE 120 may access a network (e.g., a wireless network) through the network device 110.

[0030] Figure 1 exemplarily shows a network device and two UEs. Optionally, the wireless communication system 100 may include multiple network devices, and each network device may include a different number of terminal devices within its coverage area, which is not limited in this embodiment of the present application. Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment of the present application.

[0031] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0032] The UE in the embodiments of the present application may also be referred to as a terminal device, an access terminal, a user unit, a user station, a mobile station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user apparatus. The UE in the embodiments of the present application may refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects, and machines, such as a handheld device or an in-vehicle device with wireless connection capabilities. The UE in the embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through a base station.

[0033] The network device in the embodiments of the present application may be a device for communicating with a UE, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a UE to a wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof.

[0034] In some embodiments, the network device can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile network device, and one or more cells can move according to the location of the mobile network device. In other examples, the helicopter or drone can be configured to act as a device for communicating with another network device. In some embodiments, the network device can refer to a CU or a DU, or the network device can include a CU and a DU, or the network device can also include an AAU.

[0035] It should be understood that network devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; and can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the network devices and the scenarios in which they are used.

[0036] It should also be understood that all or part of the functions of the network device and UE in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0037] The technical solutions in the embodiments of this application can be applied to sidelinks (SL). New Radio Vehicle to Everything (NR-V2X) is a sidelink transmission technology used in vehicular wireless communications. The following describes sidelinks using NR-V2X as an example.

[0038] In NR-V2X, the physical sidelink shared channel (PSSCH) and its associated physical sidelink control channel (PSCCH) are transmitted in the same time slot, and the PSCCH occupies 2 or 3 time domain symbols. The time domain resource allocation of NR-V2X is based on the time slot as the allocation granularity. For example, the starting point and length of the time domain symbols used for sidelink transmission in a time slot can be configured by the parameters sl-startSLsymbols and sl-lengthSLsymbols. The last symbol in this part of the symbols is used as the guard period (GP) symbol. PSSCH and PSCCH can only use the remaining time domain symbols. However, if the physical sidelink feedback channel (PSFCH) transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbols used for PSFCH transmission, as well as the automatic gain control (AGC) and GP symbols before the symbol.

[0039] As shown in Figure 2, the network configuration sl-StartSymbol = 3, sl-LengthSymbols = 11, that is, the 11 time domain symbols starting from symbol index 3 in a time slot can be used for sideline transmission. There are PSFCH transmission resources in the time slot. The PSFCH occupies symbols 11 and 12, among which symbol 11 is used as the AGC symbol of PSFCH, and symbols 10 and 13 are used as GPs respectively. The time domain symbols that can be used for PSSCH transmission are symbols 3 to 9. PSCCH occupies 3 time domain symbols, namely symbols 3, 4, and 5, and symbol 3 is usually used as an AGC symbol.

[0040] In NR-V2X, in addition to PSCCH and PSSCH, PSFCH may also exist in a sidelink time slot. As shown in Figure 3. It can be seen that in a time slot, the first orthogonal frequency division multiplexing (OFDM) symbol is fixed for AGC. On the AGC symbol, the UE copies the information sent on the second symbol. At the end of the time slot, there is a symbol reserved for transceiver conversion, which is used for the UE to switch from the transmit (or receive) state to the receive (or transmit) state. In the remaining OFDM symbols, PSCCH can occupy two or three OFDM symbols starting from the second sidelink symbol. In the frequency domain, the number of physical resource blocks (PRBs) occupied by PSCCH is within the subband range of a PSSCH. If the number of PRBs occupied by PSCCH is less than the size of a PSSCH subchannel, or the frequency domain resources of PSSCH include multiple subchannels, then PSCCH can be frequency-division multiplexed with PSSCH on the OFDM symbol where PSCCH is located.

[0041] The demodulation reference signal (DMRS) for the PSSCH in NR-V2X draws on the design of the NR Uu interface and uses multiple time-domain PSSCH DMRS patterns. Within a resource pool, the number of available DMRS patterns is related to the number of PSSCH symbols in the resource pool. For a specific number of PSSCH symbols (including the first AGC symbol) and PSCCH symbols, the available DMRS patterns and the position of each DMRS symbol within the pattern are shown in Table 1. Figure 4 shows a schematic diagram of the time-domain positions of four DMRS symbols when the PSSCH has 13 symbols.

[0042] Table 1 Number and position of DMRS symbols under different PSSCH and PSCCH symbol numbers

[0043] If multiple time-domain DMRS patterns are configured within the resource pool, the transmitting UE selects the specific time-domain DMRS pattern to use and indicates this in the first-order SCI. This design allows high-speed UEs to select a high-density DMRS pattern, thereby ensuring accurate channel estimation, while low-speed UEs can use a low-density DMRS pattern, thereby improving spectrum efficiency.

[0044] The generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is the initialization formula c(m) of the pseudo-random sequence. init middle, pi is the i-th cyclic redundancy check (CRC) of the PSCCH that schedules the PSSCH, where L is the number of bits of the PSCCH CRC, and L=24.

[0045] NR PDSCH and PUSCH support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. For each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single symbol DMRS frequency domain type 1 supports 4 DMRS ports, single symbol DMRS frequency domain type 2 can support 6 DMRS ports, and in the case of double DMRS symbols, the number of supported ports is doubled. However, in NR-V2X, since PSSCH only needs to support a maximum of two DMRS ports, only single symbol DMRS frequency domain type 1 is supported, as shown in Figure 4.

[0046] The NR physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. For each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single-symbol DMRS frequency domain type 1 supports 4 DMRS ports, and single-symbol DMRS frequency domain type 2 can support 6 DMRS ports. In the case of double DMRS symbols, the number of supported ports is doubled. However, in NR-V2X, since PSSCH only needs to support two DMRS ports at most, only single-symbol DMRS frequency domain type 1 is supported, as shown in Figure 5.

[0047] Similar to LTE-V2X, the frequency domain resources in the NR-V2X resource pool are contiguous, and the frequency domain resource allocation granularity is also subchannel. The number of PRBs included in a subchannel is {10, 12, 15, 20, 50, 75, 100}. The minimum subchannel size is 10 PRBs, which is much larger than the minimum subchannel size of 4 PRBs in LTE-V2X. This is mainly because the frequency domain resources of the PSCCH in NR-V2X are located in the first subchannel of its associated PSSCH. The frequency domain resources of the PSCCH are less than or equal to the size of a PSSCH subchannel, while the time domain resources of the PSCCH occupy two or three OFDM symbols. If the subchannel size is configured too small, the available PSCCH resources will be limited, the code rate will increase, and the detection performance of the PSCCH will be reduced. In NR-V2X, the PSSCH subchannel size and the PSCCH frequency domain resource size are configured independently, but the PSCCH frequency domain resources must be less than or equal to the PSSCH subchannel size. The following configuration parameters in the NR-V2X resource pool configuration information are used to determine the frequency domain resources of the PSCCH and PSSCH resource pools:

[0048] Subchannel size (sl-SubchannelSize): indicates the number of consecutive PRBs in a subchannel in the resource pool. The value range is {10, 12, 15, 20, 50, 75, 100} PRBs.

[0049] Number of subchannels (sl-NumSubchannel): indicates the number of subchannels included in the resource pool;

[0050] sl-StartRB-Subchannel: indicates the starting PRB index of the first subchannel in the resource pool.

[0051] PRB number (sl-RB-Number): indicates the number of consecutive PRBs included in the resource pool;

[0052] PSCCH frequency domain resource indicator (sl-FreqResourcePSCCH): indicates the frequency domain resource size of PSCCH, and the value range is {10, 12, 15, 20, 25} PRB.

[0053] When the UE determines the resource pool for PSSCH transmission or PSSCH reception, the frequency domain resources included in the resource pool are sl-NumSubchannel consecutive subchannels starting from the PRB indicated by sl-StartRB-Subchannel. If the number of PRBs contained in the final sl-NumSubchannel consecutive subchannels is less than the number of PRBs indicated by sl-RB-Number, the remaining PRBs cannot be used for PSSCH transmission or reception.

[0054] In NR-V2X, the frequency domain starting position of the first subchannel of PSCCH and its associated PSSCH is aligned. Therefore, as shown in Figure 6, the starting position of each PSSCH subchannel is the possible frequency domain starting position of PSCCH. The frequency domain range of the resource pool of PSCCH and PSSCH can be determined according to the above parameters.

[0055] In NR-V2X, PSCCH is used to carry side control information related to resource sensing, including:

[0056] The priority of the scheduled transmission;

[0057] Frequency domain resource allocation, indicating the number of frequency domain resources for the PSSCH in the current time slot scheduled by the PSCCH, as well as the number and starting positions of the frequency domain resources for a maximum of two retransmission resources reserved;

[0058] Time domain resource allocation, indicating the time domain locations of up to two retransmission resources;

[0059] PSSCH reference signal pattern;

[0060] Second-order sidelink control information (SCI) format;

[0061] Second-order SCI (such as SCI 2-A or SCI 2-B) rate offset;

[0062] Number of PSSCH DMRS ports;

[0063] Modulation and coding scheme (MCS);

[0064] MCS form instructions;

[0065] Number of PSFCH symbols;

[0066] Resource reservation period: reserves resources for another transport block (TB) to be sent in the next period. If inter-TB resource reservation is not activated in the resource pool configuration, this information bit field does not exist.

[0067] Reserved bits: 2 to 4 bits. The specific number of bits is configured by the network or pre-configured.

[0068] Since the PSCCH is always transmitted in the same time slot as the scheduled PSSCH, and the starting position of the PRB occupied by the PSCCH is the starting position of the first subchannel of the scheduled PSSCH, the SCI format 1-A does not explicitly indicate the time-frequency domain starting position of the scheduled PSSCH.

[0069] In NR-V2X, the transmission of PSCCH / PSSCH is based on the time slot level, that is, only one PSCCH / PSSCH can be transmitted in one time slot. It does not support the transmission of multiple PSCCH / PSSCH in one time slot through time division multiplexing (TDM). The PSCCH / PSSCH between different users can be multiplexed in one time slot through frequency division multiplexing (FDM). The time domain resources of PSSCH in NR-V2X are based on the time slot granularity, but unlike the PSSCH in LTE-V2X that occupies all the time domain symbols in a subframe, the PSSCH in NR-V2X can occupy part of the symbols in a time slot. This is mainly because in the LTE system, uplink or downlink transmissions are also based on the subframe granularity, so the side transmission is also based on the subframe granularity (special subframes in the TDD system are not used for side transmission). The NR system uses a flexible time slot structure, meaning that a time slot includes both uplink and downlink symbols, enabling more flexible scheduling and reducing latency. A typical NR system subframe is shown in Figure 7. A time slot can include downlink (DL) symbols, uplink (UL) symbols, and flexible symbols. Downlink symbols are located at the beginning of the time slot, while uplink symbols are located at the end of the time slot. Flexible symbols are located between downlink and uplink symbols, and the number of each type of symbol in each time slot is configurable.

[0070] The sidelink transmission system can share a carrier with the cellular system. In this case, sidelink transmission can only use the cellular system's uplink transmission resources. For NR-V2X, if sidelink transmission still needs to occupy all time-domain symbols in a timeslot, the network must configure a timeslot full of uplink symbols for sidelink transmission. This will significantly impact the uplink and downlink data transmission of the NR system and reduce system performance. Therefore, NR-V2X supports the use of a portion of the time-domain symbols in a timeslot for sidelink transmission, that is, a portion of the uplink symbols in a timeslot are used for sidelink transmission. In addition, considering that sidelink transmission includes AGC symbols and GP symbols, if the number of uplink symbols available for sidelink transmission is small, removing AGC symbols and GP symbols will leave even fewer symbols available for transmitting valid data, resulting in low resource utilization. Therefore, in NR-V2X, the minimum number of time-domain symbols occupied by sidelink transmission is seven (including GP symbols). When the sidelink transmission system uses a dedicated carrier, there is no issue of sharing transmission resources with other systems, and all symbols in the timeslot can be configured for sidelink transmission.

[0071] As mentioned above, NR-V2X configures the starting point and length of the time domain symbol used for sideline transmission in a time slot through the parameters starting symbol position (sl-StartSymbol) and number of symbols (sl-LengthSymbols). The last symbol in the time domain symbol used for sideline transmission is used as the guard interval GP. PSSCH and PSCCH can only use the remaining time domain symbols. However, if PSFCH transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbol used for PSFCH transmission, as well as the AGC and GP symbols before the symbol.

[0072] In the NR-V2X system, the time domain resources of the resource pool are also indicated by a bitmap. Considering the flexible time slot structure in the NR system, the length of the bitmap has been extended to support a bitmap length range of [10:160]. The method of using the bitmap to determine the time slot position belonging to the resource pool within an SFN cycle is the same as that in LTE-V2X, but with the following two differences:

[0073] The total number of time slots included in a system frame number (SFN) period is 10240×2 μ , where the parameter μ is related to the subcarrier spacing;

[0074] If at least one of the time-domain symbols Y, Y+1, Y+2, …, Y+X-1 included in a time slot is not configured as an uplink symbol by the network's TDD-UL-DL-ConfigCommon signaling, then the time slot cannot be used for sidelink transmission. Where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0075] The specific steps include:

[0076] Step 1: Remove the time slots that do not belong to the resource pool within the SFN cycle, including synchronization time slots and time slots that cannot be used for sideline transmission. The remaining time slots are represented as the remaining time slot set, and the remaining time slots are renumbered as

[0077] in:

[0078] N S_SSB Indicates the number of synchronization time slots in an SFN cycle; the synchronization time slot is determined according to synchronization-related configuration parameters, and is related to the period of transmission of synchronization signal blocks (SSBs) and the number of SSB transmission resources configured in the period;

[0079] N nonSL Indicates the number of time slots in an SFN cycle that do not comply with the uplink symbol start point and number configuration: If at least one of the time domain symbols Y, Y+1, Y+2, …, Y+X-1 included in a time slot is not semi-statically configured as an uplink symbol, then the time slot cannot be used for sidelink transmission, where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0080] Step 2: Determine the number of reserved time slots and the corresponding time domain positions.

[0081] If the number of time slots in the remaining time slot set cannot be divided by the bitmap length, the number of reserved time slots and the corresponding time domain positions need to be determined. r (0≤r<10240×2 μ -N S_SSB -N nonSL ) satisfies the following conditions, then the time slot is a reserved time slot,

[0082] in:

[0083] N reserved =(10240×2 μ -N S_SSB -N nonSL )mod L bitmap, represents the number of reserved time slots, L bitmap Indicates the length of the bitmap, m = 0, ..., N reserved -1.

[0084] Step 3: Remove the reserved time slots from the remaining time slot set. The remaining time slot set is represented as a logical time slot set. The time slots in the time slot set are all time slots that can be used in the resource pool. The time slots in the logical time slot set are renumbered as Among them, T max =10240×2 μ -N S_SSB -N nonSL -N reserved .

[0085] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0086] The bitmap in the resource pool configuration information is For a time slot in a logical time slot set , when b is satisfied k′ =1, the time slot belongs to the resource pool, where k′=kmodL bitmap .

[0087] Step 5: Renumber the time slots belonging to the resource pool determined in step 4 in order i∈{0,1,…,T′ max -1}, where T′ max Indicates the number of time slots included in the resource pool.

[0088] As shown in FIG8 , an SFN cycle (or direct frame number (DFN) cycle) includes 10240 subframes. The synchronization signal period is 160 ms, and one synchronization cycle includes two synchronization subframes. Therefore, there are a total of 128 synchronization subframes in one SFN cycle. The length of the bitmap used to indicate the time domain resources of the resource pool is 10 bits, so two reserved subframes are required. The number of remaining subframes is (10240-128-2=10110), which is evenly divisible by the bitmap length of 10. The remaining subframes are renumbered as 0, 1, 2, ..., 10109, with the first three bits of the bitmap being 1 and the remaining seven bits being 0. That is, in the remaining subframes, the first three subframes out of every ten subframes belong to the resource pool, and the remaining subframes do not belong to the resource pool. Since the bitmap needs to be repeated 1011 times in the remaining subframes to indicate whether all subframes belong to the resource pool, and each bitmap period includes 3 subframes, a total of 3033 subframes belong to the resource pool in one SFN period.

[0089] NR V2X defines two measurement quantities: channel busy ratio (CBR) and channel occupancy ratio (CR) to support congestion control. CBR is defined as: the ratio of subchannels with sidelink received signal strength indicator (SL RSSI) above the configured threshold within the CBR measurement window [nc,n-1] to the total number of subchannels in the resource pool, where c is equal to 100 or 100·2 μ time slots. CR is defined as the ratio of the number of subchannels that the UE has used to send data in the range [na,n-1] and the number of subchannels included in the sidelink authorization obtained in the range [n,n+b] to the total number of subchannels in the resource pool in the range [na,n+b]. CR can be calculated separately for different priorities. Where a is a positive integer and b is 0 or a positive integer. The values ​​of a and b are determined by the UE, but the following three conditions must be met:

[0090] 1) a + b + 1 = 1000 or 1000 2 μ time slots;

[0091] 2) b < (a + b + 1) / 2;

[0092] 3) n+b does not exceed the last retransmission of the current transmission indicated by the sideline grant.

[0093] For UEs in the radio resource control (RRC) connected state, the CBR shall be measured and reported according to the gNB configuration. The UE shall perform congestion control based on the measured CBR and CR. Specifically, within a resource pool, the congestion control process will limit the following PSCCH / PSSCH transmission parameters:

[0094] The MCS range supported in the resource pool;

[0095] The optional range of the number of sub-channels;

[0096] Maximum number of retransmissions in mode 2 (sidelink communication);

[0097] Maximum transmit power;

[0098] ∑ i≥k CR(i)≤CR Limit (k).

[0099] Where CR(i) is the CR of the side transmission of priority i measured in time slot nN, CRLimit (k) is the CR limit of the system configuration for sidelink transmission of priority k and the CBR measured in time slot nN, where N represents the time required for the UE to handle congestion control and is related to μ.

[0100] In the 3rd Generation Partnership Project (3GPP) Release 17 (R17), 3GPP RAN conducted research on "NR positioning enhancements" and "scenarios and requirements for NR positioning use cases in coverage, partial coverage, and out of coverage." The "scenarios and requirements for NR positioning use cases in coverage, partial coverage, and out of coverage" study focused on V2X and public safety use cases. In addition, the 3GPP SA1 working group also developed requirements for "ranging-based services" and positioning accuracy requirements for Internet of Things (IoT) use cases in out-of-coverage scenarios. 3GPP needs to research and develop sidelink positioning solutions to support the use cases, scenarios, and requirements identified in these activities.

[0101] To improve positioning accuracy, especially for UEs outside cellular network coverage, 3GPP completed feasibility and performance studies on positioning technology based on side-track positioning reference signals in the early stages of Rel-18. Next, 3GPP will standardize solutions for side-track positioning (including ranging and direction finding) in NR systems, including:

[0102] Standardized sidelink positioning reference signal (SL PRS). The SL PRS uses a frequency-domain structure based on a comb pattern (not excluding full RE mapping mode) and a sequence format based on a pseudo-random sequence. It uses the existing downlink positioning reference signal (DL PRS) sequence as a design starting point and supports a maximum SL PRS bandwidth of 100 MHz in frequency range 1 (FR1).

[0103] Standardize measurement quantities used to support positioning methods such as SL round trip time (RTT), SL angle of arrival (AOA), and SL time difference of arrival (TDOA).

[0104] Standardize SL PRS resource allocation schemes, including Scheme 1 and Scheme 2. Scheme 1 involves network-allocated SL PRS resources, while Scheme 2 involves UE-independent SL PRS resource selection. Support is provided for both SL PRS and Release 16 / R17 / R18 sidelink communications, as well as dedicated SL PRS resource pools. For Scheme 2, research and standardization are required for channel sensing-based resource selection, random resource selection, congestion control, and / or UE-coordinated resource selection.

[0105] Standardize the open-loop power control mechanism for SL PRS transmission, etc.

[0106] In side-by-side positioning, the transmission of SL PRS also needs to be subject to congestion control. However, it is not clear how to perform congestion control on SL PRS.

[0107] In order to solve one or more of the above technical problems, the present application proposes a communication method and a communication device. The embodiment of the present application is described in detail below with reference to FIG9 .

[0108] FIG9 is a schematic flow chart of a communication method according to an embodiment of the present application. The method 900 shown in FIG9 may include steps S910 and S920, which are as follows:

[0109] S910: The terminal device determines parameters corresponding to the SL PRS according to the CBR and / or CR.

[0110] The terminal device may determine these parameters based on the correspondence between CBR and / or CR and the parameters (corresponding to SL PRS). Optionally, the correspondence may be defined by a communication standard, configured by the network, or pre-configured.

[0111] Optionally, the parameters corresponding to the SL PRS may include one or more of the following: maximum transmit power, bandwidth range, maximum number of transmissions, minimum transmit cycle, minimum comb size, and a threshold corresponding to CR.

[0112] For example, taking CBR and maximum transmit power as an example, when CBR is A, it can correspond to maximum transmit power P, and when CBR is B, it can correspond to maximum transmit power Q. If the CBR of the terminal device is A, the maximum transmit power can be determined to be P. Among them, A, B, P and Q are all real numbers.

[0113] The parameters corresponding to the above SL PRS are described in detail below.

[0114] The maximum transmit power may refer to the maximum transmit power allowed for SL PRS. For example, if the physical channel (e.g., PSCCH) indicating SL PRS transmission and the SL PRS are frequency-division multiplexed, the maximum transmit power may be the maximum value of the total transmit power of SL PRS and the physical channel; if the physical channel (e.g., PSCCH) indicating SL PRS transmission and the SL PRS are time-division multiplexed, the maximum transmit power is also the maximum value of the transmit power of the physical channel. For different SL PRS priorities, the value of the maximum transmit power may be different. For example, the higher the priority (the smaller the priority index), the greater the maximum transmit power may be.

[0115] The bandwidth range (or allowed bandwidth range) may refer to the bandwidth range that the SL PRS may occupy. For different SL PRS priorities, the bandwidth range may be different. For example, the higher the priority (the smaller the priority index), the larger the maximum allowed bandwidth may be.

[0116] The maximum number of transmissions (or the maximum number of transmissions allowed) may refer to the number of repeated transmissions of the SL PRS. For example, if the SL PRS is transmitted periodically, the maximum number of transmissions allowed may refer to the number of repeated transmissions of the SL PRS within one period. For different SL PRS priorities, the maximum number of transmissions allowed may be different. For example, the higher the priority (the smaller the priority index), the greater the maximum number of transmissions allowed.

[0117] The minimum transmission period may refer to the minimum allowed transmission period. For different SL PRS priorities, the minimum allowed transmission period may be different. For example, the higher the priority (the smaller the priority index), the smaller the minimum allowed transmission period may be.

[0118] The minimum comb tooth size may refer to the minimum comb tooth size allowed. For example, as shown in Figure 10, the minimum comb tooth size refers to the minimum spacing between REs occupied by the SL PRS in the frequency domain. For different SL PRS priorities, the minimum comb tooth size allowed may be different. For example, the higher the priority (the smaller the priority index), the smaller the allowed priority size may be. In order to avoid interference between different UEs, the sizes used by different priorities may be multiples. For example, different priorities may use {2, 4, 8} respectively.

[0119] The threshold corresponding to CR may refer to the upper limit of the CR of the SL PRS of priority k measured by the UE. For example, the threshold corresponding to CR may be CR Limit (k), UE shall ensure ∑ i≥k CR(i)≤CR Limit (k). CR(i) is the CR of the SL PRS of priority i measured by the UE, CRLimit (k) is the CR limit for SL PRS transmission of priority k configured by the system.

[0120] The CBR is used to measure the proportion of resources whose first parameter exceeds a preset threshold in the SL PRS resource pool (also referred to as the SL PRS dedicated resource pool or the resource pool for SL PRS transmission) within the first time range. Optionally, the CBR is the proportion of first resources whose first parameter is higher than a preset threshold in the SL PRS resource pool within the first time range. Optionally, the first parameter can be a sidelink received signal strength indicator (SL RSSI).

[0121] The CBR may be measured by a terminal device, defined by a communication standard, configured by a network, or pre-configured. The first time range and the preset threshold may be defined by a standard, configured by a network, or pre-configured. For example, the first time range for calculating the CBR may be [nc, n-1], where c may be equal to 100 or 100·2 μ time slots. n, c, and μ are all natural numbers.

[0122] CR can be used to measure the proportion of resources occupied by UE in the SL PRS resource pool within the second time range. Optionally, CR can be the proportion of the number of second resources occupied by terminal devices within the second time range to the total number of second resources belonging to the SL PRS resource pool within the second time range; or, CR can be the proportion of the number of second resources occupied by terminal devices within the second time range divided by M to the total number of second resources belonging to the SL PRS resource pool within the second time range, where M is the number of resource element RE offsets allowed in the SL PRS resource pool.

[0123] The CR may be measured by a terminal device, defined by a communication standard, configured by a network, or pre-configured, and the second time range may be defined by a standard, configured by a network, or pre-configured. Optionally, the second time range may include a third time range (e.g., the third time range may be [na, n-1]) and a fourth time range (e.g., the fourth time range may be [n, n+b]) in subsequent embodiments. For example, the second time range for calculating the CR may be a time slot within the range of [na, n+b], where a+b+1=1000 or 1000·2 μ time slots, n+b does not exceed the time slot of the last SL PRS transmission opportunity indicated in the SL grant that schedules the current SL PRS transmission, and b ≥ 0, b < (a+b+1) / 2. n, a, b, and μ are all natural numbers.

[0124] In this application, the terminal device can determine the CBR and CR according to a variety of different methods, which are described in detail below.

[0125] In some embodiments, the bandwidth of the SL PRS sent by the terminal device may be equal to the bandwidth of the SL PRS resource pool. For example, for a dedicated SL PRS resource pool, the SL PRS is configured or pre-configured with multiple time-division time-domain SL PRS resources within a time slot, and the bandwidth of the SL PRS sent by the UE is always equal to the bandwidth of the SL PRS resource pool.

[0126] Optionally, the first resource may be a SL PRS time domain resource, and the first parameter may be the linear average value of the received power measured on multiple OFDM symbols contained in an SL PRS time domain resource used for SL PRS transmission in the SL PRS resource pool; or, the first resource may be an OFDM symbol, and the first parameter may be the received power measured on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

[0127] In this embodiment, the bandwidth of the SL PRS is always equal to the bandwidth of the SL PRS resource pool. Therefore, if a UE sends an SL PRS in one OFDM symbol, the transmit power in any frequency domain of the OFDM symbol should be equal. Therefore, the CBR can be defined as:

[0128] The proportion of SL PRS time domain resources in the resource pool used for SL PRS transmission within the first time range whose SL RSSI is higher than a preset threshold. The SL RSSI may be a linear average of the received powers measured on multiple OFDM symbols contained in a time domain resource used for SL PRS transmission in the resource pool;

[0129] Alternatively, the proportion of OFDM symbols in the resource pool used for SL PRS transmission within the first time range whose SL RSSI is higher than a preset threshold, where the SL RSSI may be the received power measured on an OFDM symbol used for SL PRS transmission in the resource pool.

[0130] Because the receiving UE needs to perform AGC adjustment on the first OFDM symbol of each SL PRS time domain resource, the received power of the first OFDM symbol in each SL PRS time domain resource is not included in the calculation of the SL RSSI. For example, in the example given in Figure 12, the received power of OFDM symbols #0, #4, #7, and #10 is not taken into account when calculating the SL RSSI.

[0131] The above embodiment is suitable for use in the SL PRS dedicated resource pool, which is helpful in simplifying the calculation of CBR.

[0132] Optionally, the first resource may correspond to a time-frequency resource consisting of a resource element RE offset and an SL PRS time domain resource, and the first parameter may be the linear average value of the received power measured on the RE occupied by the SL PRS on the OFDM symbol contained in the SL PRS time domain resource.

[0133] Since the SL PRS can adopt a comb-tooth structure and different RE offsets may be used by different UEs, another CBR calculation method can be the proportion of SL PRS resources with SL RSSI higher than a preset threshold in the resource pool used for SL PRS transmission within the first time range, where the SL PRS resource can correspond to a {RE offset, SL PRS time domain resource}. The SL RSSI can be the linear average of the received power measured on the REs occupied by the SL PRS in the OFDM symbol contained in the SL PRS time domain resource.

[0134] Because the receiving UE needs to perform AGC adjustment on the first OFDM symbol of each SL PRS time domain resource, the received power on the first OFDM symbol in each SL PRS time domain resource is not included in the calculation of the SL RSSI. For example, in the example given in Figure 12, the received power on OFDM symbols #0, #4, #7, and #10 is not taken into account when calculating the SL RSSI.

[0135] If the PSCCH indicating the SL PRS occupies part of the time-frequency resources in the SL PRS time domain resources for transmission, the OFDM symbols occupied by the PSCCH may not be included in the calculation of the SL RSSI.

[0136] The CBR on the resources used for PSCCH can be calculated separately, for example, it is defined as the proportion of PSCCH resources in the resource pool whose SL RSSI is higher than the preset threshold to all resources used for PSCCH. The SL RSSI is defined as the received power measured on a PSCCH resource. A PSCCH resource is one or more specific PRBs on a specific OFDM symbol in the SL PRS time domain resource.

[0137] Optionally, the first resource may correspond to a time-frequency resource consisting of a resource element RE offset and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter may be the received power measured on the RE occupied by the SL PRS on the OFDM symbol.

[0138] Since SL PRS can adopt a comb-tooth structure, different RE offsets may be used by different UEs, and the number of OFDM symbols contained in the SL PRS time domain resources configured in the SL PRS resource pool may be different. In order to more accurately reflect the resource occupancy in the SL PRS resource pool, the CBR calculation method can be the proportion of {RE offset, OFDM symbol} in the resource pool used for SL PRS transmission within the first time range whose SL RSSI is higher than the preset threshold. The SL RSSI can be the received power measured on the RE occupied by a SL PRS in an OFDM symbol.

[0139] Because the receiving UE needs to perform AGC adjustment on the first OFDM symbol of each SL PRS time domain resource, the received power on the first OFDM symbol in each SL PRS time domain resource is not included in the calculation of the SL RSSI. For example, in the example given in Figure 12, the received power on OFDM symbols #0, #4, #7, and #10 is not taken into account when calculating the SL RSSI.

[0140] If the PSCCH indicating the SL PRS occupies part of the time-frequency resources in the SL PRS time domain resources for transmission, the OFDM symbols occupied by the PSCCH may not be included in the calculation of the SL RSSI.

[0141] The CBR on the resources used for PSCCH can be calculated separately, for example, it is defined as the proportion of PSCCH resources in the SL PRS resource pool whose SL RSSI is higher than the preset threshold to all resources used for PSCCH. The SL RSSI is defined as the received power measured on a PSCCH resource, and a PSCCH resource is one or more specific PRBs on a specific OFDM symbol in the SL PRS time domain resource.

[0142] Optionally, the second resource may be an OFDM symbol.

[0143] Since the SL PRS sent by the UE always occupies the bandwidth of the entire SL PRS resource pool, and although the UE only occupies part of the REs within the bandwidth, due to in-band leakage interference between different UEs, different UEs usually cannot be multiplexed through frequency division. Therefore, CR can be defined as the ratio of the number of OFDM symbols occupied by the UE in the second time range to the total number of OFDM symbols belonging to the SL PRS resource pool in the second time range; and if different UEs are allowed to multiplex through frequency division in some cases, CR can be defined as the ratio of the number of OFDM symbols occupied by the UE divided by M to the total number of OFDM symbols belonging to the SL PRS resource pool in the second time range, where M is the number of RE offsets allowed in the resource pool, and the value range of RE offset is 0, 1, ..., comb size -1. RE offset can represent the interval of RE occupied by SL PRS on the first OFDM symbol used for SL PRS transmission relative to the start point of RB. For example, in Figure 10, the RE offset is 0, and in the example given in Figure 11, the RE offset is 2. The RE offset allowed in the resource pool can be configured by the network, pre-configured, or defined by the communication standard.

[0144] Optionally, the second resource may correspond to a time-frequency resource consisting of a resource element RE offset and an SL PRS time domain resource, and the SL PRS time domain resource may include multiple OFDM symbols occupied when sending an SL PRS.

[0145] CR can be defined as the ratio of the number of SL PRS resources occupied by the UE within the second time range to the total number of SL PRS resources belonging to the SL PRS resource pool within the second time range. Among them, one SL PRS resource can correspond to a set of {RE offset, SL PRS time domain resource}, and the SL PRS time domain resource can be multiple OFDM symbols occupied by one SL PRS transmission. As shown in Figure 12, the multiple OFDM symbols included in the SL PRS time domain resource can be located in the same time slot, and the multiple OFDM symbols included in the SL PRS time domain resource can be continuous or discontinuous (Figure 12 only shows the case where multiple OFDM symbols are continuous).

[0146] In some embodiments, the bandwidth of the SL PRS sent by the terminal device may be smaller than the bandwidth of the SL PRS resource pool. For example, if the SL PRS is configured or pre-configured with multiple time-division time-domain SL PRS resources in a time slot, the bandwidth of the SL PRS sent by the UE may be smaller than the bandwidth of the SL PRS resource pool.

[0147] Optionally, the first resource may correspond to a time-frequency resource consisting of a subchannel and a SL PRS time domain resource, and the first parameter may be the linear average value of the received power measured in a subchannel on multiple OFDM symbols contained in an SL PRS time domain resource used for SL PRS transmission in the SL PRS resource pool; or, the first resource may correspond to a time-frequency resource consisting of a subchannel and a OFDM symbol, and the first parameter may be the received power measured in a subchannel on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

[0148] In this embodiment, the bandwidth of the SL PRS may be smaller than the bandwidth of the SL PRS resource pool, and the minimum frequency domain size of the SL PRS is a subchannel. Therefore, the received power in different subchannels on an OFDM symbol may be different. Therefore, the CBR can be defined as:

[0149] The proportion of {subchannels, SL PRS time domain resources} in the resource pool used for SL PRS transmission within the first time range whose SL RSSI is higher than a preset threshold, where the SL RSSI may be a linear average of the received power measured in a subchannel on multiple OFDM symbols contained in a time domain resource used for SL PRS transmission in the resource pool;

[0150] Alternatively, the proportion of {subchannels, OFDM symbols} in the resource pool used for SL PRS transmission within the first time range whose SL RSSI is higher than the preset threshold, where SL RSSI can be the received power measured in a subchannel on an OFDM symbol used for SL PRS transmission in the resource pool.

[0151] Because the receiving UE needs to perform AGC adjustment on the first OFDM symbol of each SL PRS time domain resource, the received power on the first OFDM symbol in each SL PRS time domain resource is not included in the calculation of the SL RSSI. For example, in the example given in Figure 12, the received power on OFDM symbols #0, #4, #7, and #10 is not taken into account when calculating the SL RSSI.

[0152] The above embodiment is suitable for use in the SL PRS dedicated resource pool, which is helpful in simplifying the calculation of CBR.

[0153] Optionally, the first resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an SL PRS time domain resource, and the first parameter is the linear average value of the received power measured on the RE occupied by the SL PRS in a subchannel on the orthogonal frequency division multiplexing OFDM symbol contained in the SL PRS time domain resource.

[0154] Since SL PRS can adopt a comb-tooth structure, different RE offsets may be used by different UEs, and the bandwidth occupied by SL PRS may be smaller than the resource pool bandwidth. Therefore, another CBR calculation method can be the proportion of SL PRS resources in the resource pool used for SL PRS transmission within the first time range whose SL RSSI is higher than a preset threshold, where the SL PRS resource corresponds to a {RE offset, subchannel, SL PRS time domain resource}. The SL RSSI can be the linear average of the received power measured on the REs occupied by SL PRS in a subchannel within the OFDM symbol contained in the SL PRS time domain resource.

[0155] Because the receiving UE needs to perform AGC adjustment on the first OFDM symbol of each SL PRS time domain resource, the received power of the first OFDM symbol within each SL PRS time domain resource is not included in the calculation of the SL RSSI. For example, in the example shown in Figure 12, the received power of OFDM symbols #0, #4, #7, and #10 is not taken into account when calculating the SL RSSI.

[0156] If the PSCCH indicating the SL PRS occupies part of the time-frequency resources in the SL PRS time domain resources for transmission, the OFDM symbols occupied by the PSCCH may not be included in the calculation of the SL RSSI.

[0157] The CBR on the resources used for PSCCH can be calculated separately, for example, it is defined as the proportion of PSCCH resources in the SL PRS resource pool whose SL RSSI is higher than a specific threshold to all resources used for PSCCH. The SL RSSI can be defined as the received power measured on a PSCCH resource. A PSCCH resource can be one or more specific PRBs on a specific OFDM symbol in the SL PRS time domain resource.

[0158] Optionally, the first resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured on the RE occupied by the SL PRS in a subchannel on the OFDM symbol.

[0159] Since SL PRS can adopt a comb-tooth structure, different RE offsets may be used by different UEs, the number of OFDM symbols contained in the SL PRS time domain resources configured in the resource pool may be different, and the bandwidth occupied by SL PRS may be smaller than the bandwidth of the resource pool. In order to more accurately reflect the resource occupancy in the resource pool, the CBR calculation method can be the proportion of {RE offset, subchannel, OFDM symbol} in the resource pool used for SL PRS transmission within the first time range that is higher than the preset threshold. SL RSSI can be the received power measured on the RE occupied by an SL PRS in a subchannel within an OFDM symbol.

[0160] Because the receiving UE needs to perform AGC adjustment on the first OFDM symbol of each SL PRS time domain resource, the received power on the first OFDM symbol in each SL PRS time domain resource is not included in the calculation of the SL RSSI. For example, in the example given in Figure 12, the received power on OFDM symbols #0, #4, #7, and #10 is not taken into account when calculating the SL RSSI.

[0161] If the PSCCH indicating the SL PRS occupies part of the time-frequency resources in the SL PRS time domain resources for transmission, the OFDM symbols occupied by the PSCCH may not be included in the calculation of the SL RSSI.

[0162] The CBR on the resources used for PSCCH can be calculated separately, for example, it is defined as the proportion of PSCCH resources in the SL PRS resource pool whose SL RSSI is higher than the preset threshold to all resources used for PSCCH. The SL RSSI can be defined as the received power measured on a PSCCH resource. A PSCCH resource can be one or more specific PRBs on a specific OFDM symbol in the SL PRS time domain resource.

[0163] Optionally, the second resource corresponds to a time-frequency resource consisting of a subchannel and an orthogonal frequency division multiplexing (OFDM) symbol.

[0164] Since the bandwidth occupied by the SL PRS sent by the UE may be smaller than the bandwidth of the SL PRS resource pool, and although the UE only occupies part of the RE within the bandwidth, due to the in-band leakage interference between different UEs, different UEs usually cannot be multiplexed through frequency division. Therefore, CR can be defined as the ratio of the number of {subchannels, OFDM symbols} occupied by the UE in the first time range to the total number of {subchannels, OFDM symbols} belonging to the SL PRS resource pool in the second time range; and if different UEs are allowed to multiplex through frequency division in some cases, CR can be defined as the ratio of the number of {subchannels, OFDM symbols} occupied by the UE in the second time range divided by M to the total number of {subchannels, OFDM symbols} belonging to the SL PRS resource pool in the second time range, where the subchannel is the minimum frequency domain resource configured or pre-configured in the resource pool for SL PRS transmission, M is the number of RE offsets allowed in the resource pool, and the value range of RE offset is 0, 1, ..., comb size -1. RE offset represents the SL on the first OFDM symbol used for SL PRS transmission. The interval of REs occupied by PRS relative to the start point of RB, for example, in Figure 10, the RE offset is 0, while in the example given in Figure 11, the RE offset is 2. The allowed RE offset in the resource pool can be configured by the network, pre-configured, or defined by the communication standard.

[0165] Optionally, the second resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an SL PRS time domain resource, and the SL PRS time domain resource includes multiple orthogonal frequency division multiplexing OFDM symbols occupied when sending an SL PRS.

[0166] CR can define the ratio of the number of {RE offsets, subchannels, SL PRS time domain resources} occupied by UEs within the second time range to the total number of {RE offsets, subchannels, SL PRS time domain resources} belonging to the SL PRS resource pool within the second time range, where the subchannel is the minimum frequency domain resource configured or pre-configured in the resource pool for SL PRS transmission, and the SL PRS time domain resource is multiple OFDM symbols occupied by one SL PRS transmission. As shown in Figure 12, the multiple OFDM symbols contained in the SL PRS time domain resource can be located in the same time slot, and the multiple OFDM symbols can be continuous or discontinuous.

[0167] In some embodiments, SL PRS and sideline communications may share a resource pool.

[0168] Optionally, the first resource corresponds to a time-frequency resource consisting of a subchannel and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured in a subchannel on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

[0169] In this embodiment, SL PRS and side communication can use the same resource pool, and the minimum frequency domain bandwidth occupied by side communication is one subchannel, so the SL RSSI measured by the UE on different subchannels may be different. If SL PRS only occupies part of the OFDM symbols in the time slot, the SL RSSI measured by the UE on different OFDM symbols may also be different. In order to reflect the channel occupancy in the resource pool as accurately as possible, CBR can be defined as the proportion of {subchannels, OFDM symbols} in the resource pool used for SL PRS transmission within the first time range where the SL RSSI is higher than a preset threshold. The SL RSSI can be the received power measured on a subchannel within an OFDM symbol in the resource pool used for SL PRS transmission.

[0170] Because the receiving UE needs to perform AGC adjustment on the first OFDM symbol of each SL PRS time domain resource, the received power on the first OFDM symbol in each SL PRS time domain resource is not included in the calculation of the SL RSSI. For example, in the example given in Figure 12, the received power on OFDM symbols #0, #4, #7, and #10 is not taken into account when calculating the SL RSSI.

[0171] The above embodiment is suitable for a shared resource pool for SL PRS and SL communication, and can simultaneously reflect the resource occupancy of SL PRS transmission and SL communication.

[0172] Optionally, the first resource is a subchannel, and the CBR is the ratio of subchannels whose first parameter is higher than a preset threshold in the SL PRS resource pool within the first time range to the total number of subchannels in the SL PRS resource pool.

[0173] If the SL PRS and SL communication are in the same resource pool, the SL PRS may always occupy all OFDM symbols available for SL transmission in the time slot. In this case, the CBR can be defined as the ratio of subchannels with SL RSSI above the configured threshold in the first time range to the total number of subchannels in the resource pool, where the first time range is the measurement window [nc,n-1], which is equal to 100 or 100·2 μ time slots.

[0174] The above embodiment is suitable for a shared resource pool for SL PRS and SL communications. The CBR measurement method is the same as that for SL communications, which is beneficial to reducing the UE implementation complexity to the greatest extent possible.

[0175] Optionally, the CR may be the number of subchannels used to send data within the third time range and the ratio of the number of subchannels included in the sidelink authorization obtained within the fourth time range to the total number of subchannels belonging to the SL PRS resource pool within the third time range and the fourth time range. The third time range may be [na,n-1], the fourth time range may be [n,n+b], a is a positive integer, b is 0 or a positive integer, and the values ​​of a and b are determined by the UE, but the following three conditions must be met:

[0176] 1) a + b + 1 = 1000 or 1000 2 μ time slots;

[0177] 2) b < (a + b + 1) / 2;

[0178] 3) n+b does not exceed the last retransmission of the current transmission indicated by the sideline grant.

[0179] The above embodiment is suitable for a shared resource pool for SL PRS and SL communications. The measurement method of CR is the same as that of SL communication, which is beneficial to reducing the UE implementation complexity to the greatest extent possible.

[0180] S920, the terminal device sends SL PRS according to the parameters corresponding to SL PRS.

[0181] In an embodiment of the present application, the terminal device determines the parameters corresponding to the SL PRS based on the CBR and / or CR, and sends the SL PRS according to the parameters corresponding to the SL PRS, which can realize congestion control of the SL PRS, thereby reducing the congestion level of the system and improving positioning accuracy.

[0182] The method embodiment of the present application is described in detail above with reference to Figures 1 to 12 . The device embodiment of the present application is described in detail below with reference to Figures 13 and 14 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for portions not described in detail, reference can be made to the preceding method embodiment.

[0183] Figure 13 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication device 1300 in Figure 13 includes a determining unit 1310 and a sending unit 1320, as follows:

[0184] The determining unit 1310 is configured to determine parameters corresponding to the sidelink positioning reference signal SL PRS according to the channel busy rate CBR and / or the channel occupancy rate CR;

[0185] The sending unit 1320 is configured to send the SL PRS according to the parameters corresponding to the SL PRS.

[0186] Optionally, the parameters corresponding to the SL PRS include one or more of the following:

[0187] Maximum transmit power, bandwidth range, maximum number of transmissions, minimum transmit cycle, minimum comb tooth size, and CR corresponding thresholds.

[0188] Optionally, the CBR is a proportion of first resources in the SL PRS resource pool within a first time range whose first parameter is higher than a preset threshold.

[0189] Optionally, the CR is the ratio of the number of second resources occupied by the device within the second time range to the total number of second resources belonging to the SL PRS resource pool within the second time range; or, the CR is the ratio of the number of second resources occupied by the device within the second time range divided by M to the total number of second resources belonging to the SL PRS resource pool within the second time range, where M is the number of resource element RE offsets allowed in the SL PRS resource pool.

[0190] Optionally, the first resource is a SL PRS time domain resource, and the first parameter is the linear average of the received power measured on multiple orthogonal frequency division multiplexing OFDM symbols contained in an SL PRS time domain resource used for SL PRS transmission in the SL PRS resource pool; or, the first resource is an OFDM symbol, and the first parameter is the received power measured on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

[0191] Optionally, the first resource corresponds to a time-frequency resource consisting of a resource element RE offset and an SL PRS time domain resource, and the first parameter is the linear average value of the received power measured on the RE occupied by the SL PRS on the orthogonal frequency division multiplexing OFDM symbol contained in the SL PRS time domain resource.

[0192] Optionally, the first resource corresponds to a time-frequency resource consisting of a resource element RE offset and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured on the RE occupied by the SL PRS on the OFDM symbol.

[0193] Optionally, the second resource is an orthogonal frequency division multiplexing (OFDM) symbol.

[0194] Optionally, the second resource corresponds to a time-frequency resource consisting of a resource element RE offset and an SL PRS time domain resource, and the SL PRS time domain resource includes multiple orthogonal frequency division multiplexing OFDM symbols occupied when sending an SL PRS.

[0195] Optionally, the bandwidth of the SL PRS sent by the device is equal to the bandwidth of the SL PRS resource pool.

[0196] Optionally, the first resource corresponds to a time-frequency resource consisting of a subchannel and an SL PRS time domain resource, and the first parameter is the linear average of the received power measured in a subchannel on multiple orthogonal frequency division multiplexing OFDM symbols contained in an SL PRS time domain resource used for SL PRS transmission in the SL PRS resource pool; or, the first resource corresponds to a time-frequency resource consisting of a subchannel and an OFDM symbol, and the first parameter is the received power measured in a subchannel on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

[0197] Optionally, the first resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an SL PRS time domain resource, and the first parameter is the linear average value of the received power measured on the RE occupied by the SL PRS in a subchannel on the orthogonal frequency division multiplexing OFDM symbol contained in the SL PRS time domain resource.

[0198] Optionally, the first resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured on the RE occupied by the SL PRS in a subchannel on the OFDM symbol.

[0199] Optionally, the second resource corresponds to a time-frequency resource consisting of a subchannel and an orthogonal frequency division multiplexing (OFDM) symbol.

[0200] Optionally, the second resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an SL PRS time domain resource, and the SL PRS time domain resource includes multiple orthogonal frequency division multiplexing OFDM symbols occupied when sending an SL PRS.

[0201] Optionally, the bandwidth of the SL PRS sent by the device is smaller than the bandwidth of the SL PRS resource pool.

[0202] Optionally, the first resource corresponds to a time-frequency resource consisting of a subchannel and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured in a subchannel on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

[0203] Optionally, the first resource is a subchannel, and the CBR is the ratio of subchannels in the SL PRS resource pool whose first parameter is higher than a preset threshold within the first time range to the total number of subchannels in the SL PRS resource pool.

[0204] Optionally, the CR is the ratio of the number of subchannels used to send data within the third time range and the number of subchannels included in the sideline authorization obtained within the fourth time range to the total number of subchannels belonging to the SL PRS resource pool within the third time range and the fourth time range.

[0205] Optionally, the SL PRS and sideline communication share a resource pool.

[0206] Optionally, the first parameter is a sidelink received signal strength indication SL RSSI.

[0207] FIG14 is a schematic diagram of the structure of an apparatus provided in one embodiment of the present application. The dashed lines in FIG14 indicate that the unit or module is optional. Apparatus 1400 may be used to implement the method described in the above method embodiment. Apparatus 1400 may be a chip or a communication device.

[0208] The device 1400 may include one or more processors 1410. The processor 1410 may support the device 1400 to implement the method described in the method embodiment above. The processor 1410 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another 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, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0209] The apparatus 1400 may further include one or more memories 1420. The memories 1420 store programs that can be executed by the processor 1410, causing the processor 1410 to perform the methods described in the above method embodiments. The memories 1420 may be independent of the processor 1410 or integrated into the processor 1410.

[0210] The apparatus 1400 may further include a transceiver 1430. The processor 1410 may communicate with other devices or chips via the transceiver 1430. For example, the processor 1410 may transmit and receive data with other devices or chips via the transceiver 1430.

[0211] The present invention also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to the communication device provided in the present invention, and the program enables a computer to execute the method performed by the communication device in each embodiment of the present invention.

[0212] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the communication device provided in the present application, and the program causes a computer to execute the method performed by the communication device in each embodiment of the present application.

[0213] The embodiments of the present application also provide a computer program. The computer program can be applied to the communication device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the communication device in each embodiment of the present application.

[0214] It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0215] It should be understood that the term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0216] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0217] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0218] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0219] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0220] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can 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 instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0221] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: include: The terminal device determines the parameters corresponding to the side positioning reference signal SL PRS according to the channel busy rate CBR and / or the channel occupancy rate CR; The terminal device sends the SL PRS according to the parameters corresponding to the SL PRS.

2. The method according to claim 1, characterized in that: The parameters corresponding to the SL PRS include one or more of the following: Maximum transmit power, bandwidth range, maximum number of transmissions, minimum transmission period, minimum comb tooth size, and the corresponding thresholds of CR.

3. The method according to claim 1 or 2, characterized in that: The CBR is the proportion of first resources in the SL PRS resource pool whose first parameter is higher than a preset threshold within a first time range.

4. The method according to any one of claims 1 to 3, characterized in that The CR is the ratio of the number of second resources occupied by the terminal device within the second time range to the total number of second resources belonging to the SL PRS resource pool within the second time range; or, the CR is the ratio of the number of second resources occupied by the terminal device within the second time range divided by M to the total number of second resources belonging to the SL PRS resource pool within the second time range, where M is the number of resource element RE offsets allowed in the SL PRS resource pool.

5. The method according to claim 3, characterized in that: The first resource is a SL PRS time domain resource, and the first parameter is a linear average value of received powers measured on a plurality of orthogonal frequency division multiplexing OFDM symbols included in a SL PRS time domain resource used for SL PRS transmission in the SL PRS resource pool; or, The first resource is an OFDM symbol, and the first parameter is the received power measured on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

6. The method according to claim 3, characterized in that The first resource corresponds to a time-frequency resource consisting of a resource element RE offset and an SL PRS time domain resource, and the first parameter is the linear average value of the received power measured on the RE occupied by the SL PRS on the orthogonal frequency division multiplexing OFDM symbol contained in the SL PRS time domain resource.

7. The method according to claim 3, characterized in that The first resource corresponds to a time-frequency resource consisting of a resource element RE offset and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured on the RE occupied by the SL PRS on the OFDM symbol.

8. The method according to claim 4, characterized in that The second resource is an orthogonal frequency division multiplexing (OFDM) symbol.

9. The method according to claim 4, characterized in that The second resource corresponds to a time-frequency resource consisting of a resource element RE offset and an SL PRS time domain resource, and the SL PRS time domain resource includes multiple orthogonal frequency division multiplexing OFDM symbols occupied when sending an SL PRS.

10. The method according to any one of claims 4 to 9, characterized in that The bandwidth of the SL PRS sent by the terminal device is equal to the bandwidth of the SL PRS resource pool.

11. The method according to claim 3, characterized in that The first resource corresponds to a time-frequency resource consisting of a subchannel and an SL PRS time domain resource, and the first parameter is a linear average value of received power measured in a subchannel on multiple orthogonal frequency division multiplexing OFDM symbols contained in an SL PRS time domain resource used for SL PRS transmission in the SL PRS resource pool; or, The first resource corresponds to a time-frequency resource consisting of a subchannel and an OFDM symbol, and the first parameter is the received power measured in a subchannel on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

12. The method according to claim 3, characterized in that The first resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an SL PRS time domain resource, and the first parameter is the linear average value of the received power measured on the RE occupied by the SL PRS in a subchannel on the orthogonal frequency division multiplexing OFDM symbol contained in the SL PRS time domain resource.

13. The method according to claim 3, characterized in that The first resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured on the RE occupied by the SL PRS in a subchannel on the OFDM symbol.

14. The method according to claim 4, characterized in that The second resource corresponds to a time-frequency resource consisting of a sub-channel and an orthogonal frequency division multiplexing OFDM symbol.

15. The method according to claim 4, characterized in that The second resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an SL PRS time domain resource, and the SL PRS time domain resource includes multiple orthogonal frequency division multiplexing OFDM symbols occupied when sending an SL PRS.

16. The method according to any one of claims 11 to 15, characterized in that The bandwidth of the SL PRS sent by the terminal device is smaller than the bandwidth of the SL PRS resource pool.

17. The method according to claim 3, characterized in that The first resource corresponds to a time-frequency resource consisting of a subchannel and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured in a subchannel on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

18. The method according to claim 3, characterized in that The first resource is a subchannel, and the CBR is the ratio of subchannels whose first parameter is higher than a preset threshold in the SL PRS resource pool within the first time range to the total number of subchannels in the SL PRS resource pool.

19. The method according to any one of claims 1 to 3, 17 or 18, characterized in that The CR is the ratio of the number of subchannels used to send data within the third time range and the number of subchannels included in the sidelink authorization obtained within the fourth time range to the total number of subchannels belonging to the SL PRS resource pool within the third time range and the fourth time range.

20. The method according to any one of claims 17 to 19, characterized in that The SL PRS and sideline communication share a resource pool.

21. The method according to any one of claims 3 to 20, characterized in that The first parameter is a sidelink received signal strength indication SL RSSI.

22. A communication device, characterized in that: include: A determination unit, configured to determine parameters corresponding to a side positioning reference signal SL PRS according to a channel busy rate CBR and / or a channel occupancy rate CR; The sending unit is used to send the SL PRS according to the parameters corresponding to the SL PRS.

23. The device according to claim 22, characterized in that The parameters corresponding to the SL PRS include one or more of the following: Maximum transmit power, bandwidth range, maximum number of transmissions, minimum transmission period, minimum comb tooth size, and the corresponding thresholds of CR.

24. The device according to claim 22 or 23, characterized in that The CBR is the proportion of first resources in the SL PRS resource pool whose first parameter is higher than a preset threshold within a first time range.

25. The device according to any one of claims 22 to 24, characterized in that The CR is the ratio of the number of second resources occupied by the device within the second time range to the total number of second resources belonging to the SL PRS resource pool within the second time range; or, the CR is the ratio of the number of second resources occupied by the device within the second time range divided by M to the total number of second resources belonging to the SL PRS resource pool within the second time range, where M is the number of resource element RE offsets allowed in the SL PRS resource pool.

26. The device according to claim 24, characterized in that The first resource is a SL PRS time domain resource, and the first parameter is a linear average value of received powers measured on a plurality of orthogonal frequency division multiplexing OFDM symbols included in a SL PRS time domain resource used for SL PRS transmission in the SL PRS resource pool; or, The first resource is an OFDM symbol, and the first parameter is the received power measured on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

27. The device according to claim 24, characterized in that The first resource corresponds to a time-frequency resource consisting of a resource element RE offset and an SL PRS time domain resource, and the first parameter is a linear average value of received power measured on REs occupied by SL PRS on an orthogonal frequency division multiplexing OFDM symbol contained in the SL PRS time domain resource.

28. The device according to claim 24, characterized in that The first resource corresponds to a time-frequency resource consisting of a resource element RE offset and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured on the RE occupied by the SL PRS on the OFDM symbol.

29. The device according to claim 25, characterized in that The second resource is an orthogonal frequency division multiplexing (OFDM) symbol.

30. The device according to claim 25, characterized in that The second resource corresponds to a time-frequency resource consisting of a resource element RE offset and an SL PRS time domain resource, and the SL PRS time domain resource includes multiple orthogonal frequency division multiplexing OFDM symbols occupied when sending an SL PRS.

31. The device according to any one of claims 25 to 30, characterized in that The bandwidth of the SL PRS sent by the device is equal to the bandwidth of the SL PRS resource pool.

32. The device according to claim 24, characterized in that The first resource corresponds to a time-frequency resource consisting of a subchannel and an SL PRS time domain resource, and the first parameter is a linear average value of received power measured in a subchannel on multiple orthogonal frequency division multiplexing OFDM symbols contained in an SL PRS time domain resource used for SL PRS transmission in the SL PRS resource pool; or, The first resource corresponds to a time-frequency resource consisting of a subchannel and an OFDM symbol, and the first parameter is the received power measured in a subchannel on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

33. The device according to claim 24, characterized in that The first resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an SL PRS time domain resource, and the first parameter is the linear average value of the received power measured on the RE occupied by the SL PRS in a subchannel on the orthogonal frequency division multiplexing OFDM symbol contained in the SL PRS time domain resource.

34. The device according to claim 24, characterized in that The first resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured on the RE occupied by the SL PRS in a subchannel on the OFDM symbol.

35. The device according to claim 25, characterized in that The second resource corresponds to a time-frequency resource consisting of a sub-channel and an orthogonal frequency division multiplexing OFDM symbol.

36. The device according to claim 25, characterized in that The second resource corresponds to a time-frequency resource consisting of a resource element RE offset, a subchannel and an SL PRS time domain resource, and the SL PRS time domain resource includes multiple orthogonal frequency division multiplexing OFDM symbols occupied when sending an SL PRS.

37. The device according to any one of claims 32 to 36, characterized in that The bandwidth of the SL PRS sent by the device is smaller than the bandwidth of the SL PRS resource pool.

38. The device according to claim 24, characterized in that The first resource corresponds to a time-frequency resource consisting of a subchannel and an orthogonal frequency division multiplexing OFDM symbol, and the first parameter is the received power measured in a subchannel on an OFDM symbol used for SL PRS transmission in the SL PRS resource pool.

39. The device according to claim 24, characterized in that The first resource is a subchannel, and the CBR is the ratio of subchannels whose first parameter is higher than a preset threshold in the SL PRS resource pool within the first time range to the total number of subchannels in the SL PRS resource pool.

40. The device according to any one of claims 22 to 24, 38 or 39, characterized in that The CR is the ratio of the number of subchannels used to send data within the third time range and the number of subchannels included in the sidelink authorization obtained within the fourth time range to the total number of subchannels belonging to the SL PRS resource pool within the third time range and the fourth time range.

41. The device according to any one of claims 38 to 40, characterized in that The SL PRS and sideline communication share a resource pool.

42. The device according to any one of claims 24 to 41, characterized in that The first parameter is a sidelink received signal strength indication SL RSSI.

43. A communication device, characterized in that: It includes a memory, a transceiver and a processor, the memory is used to store programs, the processor sends and receives data through the transceiver, and the processor is used to call the program in the memory so that the communication device executes the method as described in any one of claims 1 to 21.

44. A communication device, characterized in that: The device comprises a processor, configured to call a program from a memory so as to enable the communication device to execute the method according to any one of claims 1 to 21.

45. A chip, characterized in that: The device comprises a processor, configured to call a program from a memory so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 21.

46. ​​A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 21.

47. A computer program product, characterized in that A program is included, the program causing a computer to execute the method according to any one of claims 1 to 21.

48. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 21.

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