A PRS transmission method, device and user equipment

Abstract

The present application discloses a PRS transmission method, apparatus, and user equipment, relating to the field of communication technology. A portion of the guard interval (GP) symbols in the frame structure is used to carry a positioning reference signal (PRS) sequence. The transmission and reception of the PRS sequence are completely independent of the transmission and reception of service data carried by other symbols in the frame structure. This method, on the one hand, enables the use of the existing LTE-V frame structure to transmit carrier phase-related information, achieving high-precision synchronization and positioning of user equipment, and on the other hand, reduces the resource waste problem of existing GP redundancy.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a PRS transmission method, apparatus, and user equipment. Background Art

[0002] In indoor or tunnel scenarios, a self-synchronization mechanism is necessary. The existing Long Term Evolution Vehicle (LTE-V) standard for vehicle-to-vehicle synchronization has relatively low accuracy. To achieve high-precision synchronization and positioning, a carrier-based positioning mechanism can be introduced. Positioning relies on synchronization accuracy. As mentioned earlier, the LTE-V standard's low synchronization accuracy results in relatively low positioning accuracy. Therefore, a carrier-based positioning mechanism can be introduced to achieve high-precision synchronization and positioning.

[0003] However, LTE-V currently does not support the transmission of carrier phase-related information. In order to achieve accurate synchronization positioning, it is necessary to consider how to use the existing LTE-V frame structure to send Positioning Reference Signal (PRS) positioning assistance information, so as to achieve more accurate synchronization positioning based on the sent PRS positioning assistance information and other information. Summary of the Invention

[0004] The purpose of the present application is to provide a PRS transmission method, apparatus and user equipment, so as to solve the problem that the existing LTE-V frame structure cannot send carrier phase related information.

[0005] In the first aspect, in order to achieve the above-mentioned purpose, an embodiment of the present application provides a frame structure, in which a part of the guard interval GP symbol in the frame structure is used to carry a positioning reference signal PRS sequence, and the sending and receiving of the PRS sequence is completely independent of the sending and receiving of service data carried by other symbols in the frame structure.

[0006] Optionally, the GP symbol is divided into a first GP part, a part for carrying a PRS sequence and a second GP part in sequence in the time domain, and the part for carrying the PRS sequence occupies all subcarriers of the system bandwidth in the frequency domain.

[0007] Optionally, the GP symbol includes one or more repeated parts for carrying a PRS sequence, wherein the PRS is repeatedly sent on each of the parts for carrying a PRS sequence.

[0008] Optionally, the subcarriers used to carry the PRS sequence are divided into multiple orthogonal subcarrier groups, and the adjacent subcarriers within each subcarrier group are equidistant in the frequency domain, wherein the number of the orthogonal subcarrier groups is the ratio of the total number of subcarriers carrying the PRS sequence in the system to the frequency domain multiplexing factor between users, and each user device sends the PRS sequence on only one subcarrier group.

[0009] Optionally, the PRS sequence adopts a ZC sequence, wherein the value of the ZC sequence is determined by the length of a first sequence used to generate the ZC sequence, and the length of the first sequence is related to the number of subcarriers in the subcarrier group.

[0010] Optionally, through code division multiplexing, the subcarriers in each subcarrier group can be used to send multiple groups of PRS sequences; wherein each subcarrier group and a group of PRS sequences carried on the subcarrier group correspond to a PRS ID, and each PRS ID corresponds to a user equipment.

[0011] Optionally, frequency domain resources carrying a PRS sequence are allocated to each PRS ID according to at least one of the following multiplexing principles, where one PRS ID corresponds to one user equipment;

[0012] Frequency domain reuse is prioritized;

[0013] Code domain multiplexing takes priority.

[0014] In a second aspect, to achieve the above-mentioned objective, an embodiment of the present application provides a PRS transmission method, applied to a first user equipment, including:

[0015] According to the configuration principle, the sending of PRS is triggered, wherein the PRS is carried in the GP symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the sending of the PRS is completely independent of the sending of service data.

[0016] Optionally, according to the configuration principle, triggering the sending of the PRS includes any of the following:

[0017] Triggering the sending of the PRS based on each V2X logical subframe;

[0018] Based on the configuration information, the sending of the PRS is triggered.

[0019] Optionally, the method further includes:

[0020] Determine, based on the PRS ID corresponding to the first user equipment, a correspondence between a subcarrier group and a group of PRS sequences carried on the subcarrier group and the PRS ID, a subcarrier group number and a PRS sequence number for carrying the PRS;

[0021] The PRS is sent according to the subcarrier group number and the PRS sequence number.

[0022] Optionally, sending the PRS according to the subcarrier group number and the PRS sequence number includes:

[0023] In a case where the PRS sequence number corresponds to multiple PRS sequences, the PRS is repeatedly transmitted based on the multiple PRS sequences.

[0024] In a third aspect, to achieve the above-mentioned objective, an embodiment of the present application provides a PRS transmission method, applied to a second user equipment, including:

[0025] According to the configuration principle, the reception of the PRS sequence is triggered, wherein the PRS is carried in the GP symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the reception of the PRS is completely independent of the reception of the service data.

[0026] Optionally, according to a configuration principle, triggering reception of a PRS sequence includes any of the following:

[0027] triggering reception of the PRS sequence in each V2X logical subframe;

[0028] Based on the configuration information, reception of the PRS sequence is triggered.

[0029] Optionally, the method further includes:

[0030] Detecting a PRS sequence at a position corresponding to a subcarrier group; wherein the time domain resource corresponding to the subcarrier group is located at the GP symbol;

[0031] The PRS ID of the first user equipment that sends the PRS sequence is determined according to the detected PRS sequence and the correspondence between the subcarrier group, a group of PRS sequences carried on the subcarrier group, and the PRS ID.

[0032] Optionally, the method further includes:

[0033] Obtaining phase offset information between the second user equipment and the first user equipment according to the PRS sequence and the PRS ID;

[0034] According to the phase deviation information, the timing deviation between the second user equipment and the first user equipment and / or the position estimation information of the second user equipment itself are obtained.

[0035] In a fourth aspect, to achieve the above-mentioned objective, an embodiment of the present application provides a PRS transmission apparatus, applied to a first user equipment, including:

[0036] A trigger module is used to trigger the sending of PRS according to a configuration principle, wherein the PRS is carried in a GP symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the sending of the PRS is completely independent of the sending of service data.

[0037] In a fifth aspect, to achieve the above-mentioned objective, an embodiment of the present application provides a PRS transmission apparatus, applied to a second user equipment, including:

[0038] A trigger module is used to trigger the reception of a PRS sequence according to a configuration principle, wherein the PRS is carried in a GP symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the reception of the PRS is completely independent of the reception of service data.

[0039] In a sixth aspect, in order to achieve the above-mentioned purpose, an embodiment of the present application provides a user equipment, including a transceiver, a memory, a processor, and a computer program stored on the memory and running on the processor, wherein when the processor executes the computer program, the PRS transmission method as described in the second aspect is implemented, or the PRS transmission method as described in the third aspect is implemented.

[0040] In the seventh aspect, in order to achieve the above-mentioned purpose, an embodiment of the present application provides a readable storage medium on which a program or instruction is stored. When the program or instruction is executed by the processor, the PRS transmission method as described in the second aspect is implemented, or the PRS transmission method as described in the third aspect is implemented.

[0041] The above technical solution of the present application has at least the following beneficial effects:

[0042] In the frame structure of the embodiment of the present application, by carrying the PRS sequence on the GP symbol, on the one hand, it is realized to send carrier phase related information on the existing LTE-V frame knot to further achieve higher synchronization and positioning accuracy; on the other hand, it reduces the redundancy of the existing GP symbols and improves resource utilization; on the other hand, the sending and receiving of the PRS sequence is completely independent of the sending and receiving of service data carried by other symbols in the same frame structure, that is, the transmitting user equipment can send PRS regardless of whether it sends service data, so that high-precision synchronization and positioning can be achieved between user devices based on the PRS. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of an existing LTE-V frame structure;

[0044] Figure 2A Schematic diagram of the structure of S-SSB with a conventional cyclic prefix;

[0045] Figure 2B Schematic diagram of the structure of S-SSB with extended cyclic prefix;

[0046] Figure 3 Schematic diagram of the frame structure of the PSBCH channel;

[0047] Figure 4 This is one of the schematic diagrams of the frame structure of an embodiment of the present application;

[0048] Figure 5 This is a second schematic diagram of the frame structure of an embodiment of the present application;

[0049] Figure 6 This is a flowchart of a PRS transmission method according to an embodiment of the present application;

[0050] Figure 7 This is a second flow chart of the PRS transmission method according to an embodiment of the present application;

[0051] Figure 8 This is one of the structural diagrams of the PRS transmission device according to an embodiment of the present application;

[0052] Figure 9 This is the second structural diagram of the PRS transmission device according to an embodiment of the present application;

[0053] Figure 10 A schematic diagram of the structure of a user equipment according to an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the technical problems, technical solutions and advantages to be solved by the present application clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures has been omitted.

[0055] It should be understood that references throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0056] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the following 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.

[0057] In the embodiments provided herein, it should be understood that "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; B can also be determined based on A and / or other information.

[0058] When describing the embodiments of the present application, some concepts used in the following description are first explained.

[0059] 1. LTE-V frame structure

[0060] like Figure 1 As shown, the LTE-V frame structure is as follows Figure 1 As shown in the figure, it is assumed that the transmission time interval (TTI) length is 1ms. A TTI consists of two time slots. The first symbol of the subframe is used to carry service data, and the receiver performs automatic gain control (AGC) adjustment on this symbol. The last symbol of the subframe is used as the guard interval (GP). The GP uses the puncture method to map resource elements (RE).

[0061] Assuming an LTE-V2X system bandwidth of 20MHz, a subcarrier spacing of 15kHz, and 1200 subcarriers, the number of Inverse Fast Fourier Transform (IFFT) points is 2048, meaning one OFDM symbol has 2048 sampling points. The symbol length is 1 / 15kHz = 66.7µs. During GP data mapping, the GP is mapped and then discarded. This means the GP is not actually used to carry data; its primary purpose is to convert between transmit and receive signals. However, the 66.7µs time far exceeds actual requirements. While this is the minimum granularity, it wastes resources.

[0062] 2. Basic frame structure of synchronous subframe

[0063] like Figure 2A and Figure 2BAs shown in the figure, in the time domain: except for the last symbol, the sidelink-Primary Synchronization Signal (S-PSS), the sidelink-Secondary Synchronization Signal (S-SSS) and the Physical Sidelink Broadcast Channel (PSBCH) are sent on the remaining symbols; the synchronization signals S-PSS and S-SSS respectively occupy two consecutive symbols in a time slot, and the same synchronization signal sequence is sent on the two symbols occupied by the S-PSS or S-SSS.

[0064] For the PSBCH channel, the number of pilot symbols occupied is 3, such as Figure 3 As shown, the positions occupied by the three pilot symbols are symbols 4, 6, and 9.

[0065] The SLSS (Sidelink Synchronisation Signal) ID can be obtained based on the ID information carried by the Primary Sidelink Synchronization Signal (PSSS) (0 or 1) and the Secondary Synchronization Sidelink Signal (SSSS) (0 to 167). This ID represents the priority level of the synchronization resource, and the UE with the highest synchronization resource priority can be selected as the timing reference synchronization resource.

[0066] in, here,

[0067] When UE detects PSS and SSS, it can get Subframe header synchronization is completed based on the position of the PSSS and SSS. That is, through the PSS and SSS, the UE can obtain timing information, frequency offset information, SSID, and other information; through the PSBCH, the radio frame number and subframe number can be obtained to align with the node sending the air interface message. Specifically, the resources and synchronization signals corresponding to different synchronization states are shown in Table 1 below:

[0068] Table 1

[0069]

[0070]

[0071] Below, in conjunction with the accompanying drawings, the implementation process of the PRS transmission method, device and user equipment of the embodiments of the present application is described in detail.

[0072] The embodiment of the present application provides a frame structure, such as Figure 4 As shown, a portion of the GP symbols in the frame structure is used to carry a positioning reference signal PRS sequence. Specifically, the transmission and reception of the PRS sequence are completely independent of the transmission and reception of service data carried by other symbols in the frame structure.

[0073] In the frame structure of the embodiment of the present application, by carrying the PRS sequence on the GP symbol, on the one hand, it is realized to send carrier phase related information on the existing LTE-V frame knot to further achieve higher synchronization and positioning accuracy; on the other hand, it reduces the redundancy of the existing GP symbols and improves resource utilization; on the other hand, the sending and receiving of the PRS sequence is completely independent of the sending and receiving of service data carried by other symbols in the same frame structure, that is, the transmitting user equipment can send PRS regardless of whether it sends service data, so that high-precision synchronization and positioning can be achieved between user devices based on the PRS.

[0074] As a specific implementation method, Figure 4 For example, a GP symbol is divided into a first GP portion, a portion for carrying a PRS sequence, and a second GP portion in the time domain. This means that in this specific implementation, a portion of the GP symbol in the existing LTE-V frame structure is used to transmit the PRS sequence. In this specific implementation, the lengths of the first and second GP portions are 584 Ts, respectively, and are used for transceiver / transmitter switching. The portion carrying the PRS sequence is 1024 Ts long. If two PRS sequences are transmitted repeatedly, each portion is 512 Ts long. Furthermore, the portion carrying the PRS sequence occupies all subcarriers of the system bandwidth in the frequency domain.

[0075] As a more specific implementation, such as Figure 5 As shown, a GP symbol includes one or more repeated portions for carrying a PRS sequence, wherein the PRS is repeatedly transmitted on each portion for carrying the PRS sequence. In other words, when the portion for carrying the PRS sequence in a GP symbol includes two or more portions, the same specific PRS sequence can be repeatedly transmitted on the portions for carrying the PRS sequence.

[0076] As an optional implementation, the subcarriers used to carry the PRS sequence are divided into multiple orthogonal subcarrier groups, and the adjacent subcarriers in each subcarrier group are equally spaced in the frequency domain, where the number of orthogonal subcarrier groups is the ratio of the total number of subcarriers carrying the PRS sequence in the system to the frequency domain multiplexing factor between users, and each user equipment only sends the PRS sequence on one subcarrier group. Here, the frequency domain multiplexing factor M, that is, the number of all PRS subcarriers in the frequency division of multiple users, can be a number that can be divided evenly among {1, 2, 3, 4, 5, ..., 30}; the total number of subcarriers = 1200 × single PRS time domain length / 2048Ts;

[0077] For a specific example of this optional implementation, assuming that the time domain length of a single PRS is 1024, the total number of PRS subcarriers in the system is 600 (the time domain length of a single PRS is 512, the total number of PRS subcarriers in the system is 300): assuming that the frequency domain multiplexing factor is 20 (20 can be divided by 600), the number of subcarriers for sending PRS by a single user is 600 / 20=30.

[0078] The following describes this optional implementation method with reference to specific examples:

[0079] The position L of the first subcarrier occupied by the PRS sequence sc Its carrier frequency position number L prs The calculation formula is as follows:

[0080]

[0081] Among them, L prs ∈[0,19], interval D sc =20, total number of subcarriers N sc =600.

[0082] On this basis, the PRS orthogonal resource position is 1; the subcarrier positions under the code length of 30 are as follows: Group 1 (0): 0, 20, 40, ..., 580; Group 2 (1): 2, 22, 42, ..., 582; ...; Group 10 (9): 18, 38, 58, ..., 598; Group 11 (10): 600, 620, 640, ..., 1180; ...; Group 20 (19): 618, 638, 658, ..., 1198.

[0083] On this basis, the PRS orthogonal resource position is 2; the subcarrier positions under the code length of 30 are as follows: the first group (0): 0, 40, 80, ..., 1198; the second group (1): 2, 42...; the third group (2): 4, 44...; the fourth group: 6, 46, ...; the 20th group (19): 38, 78...

[0084] That is to say, in this optional implementation, it is only necessary to satisfy that the resources between the subcarrier groups are completely orthogonal and the multiple subcarriers in the group are equidistant.

[0085] As a specific implementation, the PRS sequence adopts a ZC sequence, where the value of the ZC sequence is determined by the length of a first sequence (for example, the first sequence is an m-sequence, but not limited thereto) that generates the ZC sequence, and the length of the first sequence is related to the number of subcarriers in the subcarrier group. Here, taking the aforementioned single-user sending PRS as 30 subcarriers and the first sequence as an m-sequence as an example, the length of m is 30 / 2=15. On this basis, the value of the ZC sequence can be further determined based on the length of the m-sequence.

[0086] As another optional implementation, through code division multiplexing, the subcarriers in each subcarrier group can be used to send multiple groups of PRS sequences; wherein each subcarrier group and a group of PRS sequences carried on the subcarrier group correspond to a PRSID, and each PRS ID corresponds to a user equipment.

[0087] That is to say, in an embodiment of the present application, the correspondence between the PRS ID, the subcarrier group number and the PRS sequence number can be pre-defined. In this way, the user equipment of the sender can determine the sending resource location and the specific sequence number based on the PRS ID, and the user equipment of the receiver can perform blind detection on the resources in a specific area based on the PRS ID to narrow the scope of blind detection and reduce complexity.

[0088] Here, it should be noted that the PRS ID can be configured for each user equipment through a management configuration device, or the upper layer obtains and parses it and informs the lower layer, that is, the PRS ID needs to be part of the UE context.

[0089] As an optional implementation, frequency domain resources carrying the PRS sequence (including the subcarrier group number and the PRS sequence number) are allocated to each PRS ID according to at least one of the following multiplexing principles, where one PRS ID corresponds to one user equipment;

[0090] Frequency domain multiplexing is prioritized, that is, different PRS IDs are mapped to different subcarrier groups first. After all subcarrier groups are allocated, different PRS numbers are used in each subcarrier group in turn.

[0091] Code domain multiplexing is prioritized, that is, different PRS IDs are mapped to subcarrier groups on the same subcarrier group first. When all PRS sequence numbers are allocated, the next subcarrier group is allocated.

[0092] Here, it should be noted that the principle of frequency domain multiplexing priority includes: when the PRS IDs of multiple users of resource multiplexing are continuous IDs (such as: configuring IDs for each RSU in the order of the deployment geographical location of the RSU, that is, the PRS IDs configured for two geographically adjacent RSUs are continuous PRS IDs), (recommendation) frequency domain multiplexing is given priority; or, when the number of PRSIDs far exceeds the number of users, (recommendation) frequency domain multiplexing is given priority.

[0093] The following describes a specific example of this optional implementation:

[0094] Example 1: Prioritize frequency division multiplexing, then code division multiplexing

[0095] Assume that the number of configurable user temporary IDs (PRSIDs) is 600, and the user temporary IDs are: 0, 1, 2, ..., 599; assume that the PRS sequence length is 30, 600 subcarriers;

[0096] When the multiplexing principle is frequency division followed by code division, there may be 20 subcarrier groups in the frequency domain, and each subcarrier group may have 30 subcarriers. Thus, when configuring resources:

[0097] The first type of sequence number traversal resources: ID1, ID2, ID3, ID4, ID5, ID6, ID7, ID8, ID9, ID10, ID11, ID12, ID13, ID14, ID15, ID16, ID17, ID18, ID19, ID20; that is, the PRS IDs corresponding to the 20 users with PRS IDs ID1 to ID20 are mapped to 20 subcarrier groups;

[0098] The second type of sequence number traversal resources: ID21, ID22, ID23, ID24, ID25, ID26, ID27, ..., ID40; that is, the PRS IDs corresponding to 20 users with PRS IDs ID1 to ID20 are mapped to 20 subcarrier groups, and these users have different PRS sequence numbers from those corresponding to ID1 to ID20. Taking ID1 and ID21 as an example, the user corresponding to ID21 and the user corresponding to ID1 send different PRS sequences on the same resource (subcarrier group).

[0099] Example 2: Prioritize CDM, then FDM

[0100] Assume that the number of configurable user temporary IDs (PRS IDs) is 600, and the user temporary IDs are: 0, 1, 2, ..., 599; assume that the PRS sequence length is 30, 600 subcarriers;

[0101] When the multiplexing principle is code division first and then frequency division, the code division traversal is 30 groups, and each group of frequency domain positions is 20 positions.

[0102] The corresponding index is:

[0103] At the first resource position: ID1, ID2, ID3, ..., ID28, ID29, ID30;

[0104] In the second resource location: ID31, ID32, ID33, ..., ID 58, ID59, ID60;

[0105] At the 20th resource position: ID571, ID572, ..., ID598, ID599, ID600;

[0106] The difference between users on each resource (subcarrier group) is achieved through code division, that is, the signal sequences are different.

[0107] The embodiment of the present application also provides a PRS transmission method, which is applied to a first user equipment, such as Figure 6 As shown, the method includes:

[0108] Step 601 triggers the transmission of a PRS according to a configuration principle. The PRS is carried in a GP symbol, which is completely independent of other symbols in the frame structure in which the GP symbol resides. The PRS transmission is completely independent of the transmission of service data. Here, the GP symbol is the GP symbol in the aforementioned frame structure.

[0109] In the PRS transmission method of the embodiment of the present application, the first user equipment triggers the sending of PRS in a specific time slot based on the configuration principle. The sending of the PRS is completely independent of the sending of service data, and the GP symbol carrying the PRS is completely independent of other corresponding symbols (symbols carrying corresponding service data). That is, the sending of PRS is not affected by the sending of service data, but is sent directly based on the configuration principle. In this way, other user equipment can track and locate the first user equipment, thereby improving the accuracy of synchronization and positioning between user equipment.

[0110] As a specific implementation, step 601 includes any of the following:

[0111] Triggering the transmission of the PRS based on each Vehicle to Everything (V2X) logical subframe; i.e., transmitting the PRS on each V2X logical subframe;

[0112] The sending of the PRS is triggered based on the configuration information. Here, the configuration information is, for example, a sending period, such as sending the PRS once every two time slots, or sending the PRS twice in each time slot.

[0113] That is to say, in this optional implementation, PRS can be sent on each V2X logical subframe based on the configuration principle, or PRS can be sent periodically based on the configured transmission period.

[0114] Furthermore, as an optional implementation, the method further includes:

[0115] Determining, based on the PRS ID corresponding to the first user equipment, a correspondence between a subcarrier group and a group of PRS sequences carried on the subcarrier group and the PRSID, a subcarrier group number and a PRS sequence number for carrying the PRS; where the correspondence may be a predefined correspondence or a preconfigured correspondence, that is, each PRS ID corresponds to a specific subcarrier group and PRS sequence;

[0116] The PRS is sent according to the subcarrier group number and the PRS sequence number, that is, the PRS is sent on the subcarrier corresponding to the subcarrier group number using the PRS sequence.

[0117] In this optional implementation, the first user equipment determines the PRS transmission resources based on the PRSID configured for it. In this way, different user equipments can be prevented from using the same transmission resources to transmit PRS, thereby reducing the possibility of collision in PRS transmission and improving the reliability of PRS transmission.

[0118] As a specific implementation, sending the PRS according to the subcarrier group number and the PRS sequence number includes:

[0119] When the PRS sequence number corresponds to multiple PRS sequences, the PRS is repeatedly transmitted based on the multiple PRS sequences. That is, when the GP symbol is divided into multiple parts for carrying PRS, the PRS can be repeatedly transmitted on the multiple parts for carrying PRS.

[0120] The embodiment of the present application also provides a PRS transmission method, which is applied to a second user equipment, such as Figure 7 As shown, the method includes:

[0121] Step 701 triggers reception of a PRS sequence according to a configuration principle. The PRS is carried in a GP symbol, which is completely independent of other symbols in the frame structure in which the GP symbol resides. Reception of the PRS is completely independent of reception of service data. Here, the GP symbol is the GP symbol in the aforementioned frame structure.

[0122] In the PRS transmission method of the embodiment of the present application, the second user equipment triggers the reception of PRS in a specific time slot based on the configuration principle. The reception of the PRS is completely independent of the reception of the service data, and the GP symbol carrying the PRS is completely independent of the corresponding other symbols (symbols carrying the corresponding service data). That is, the reception of PRS is not affected by the reception of the service data, but is directly received based on the configuration principle. In this way, the tracking and positioning of the first user equipment can be achieved, thereby improving the accuracy of synchronization and positioning between user equipment.

[0123] As an optional implementation, step 701 includes any of the following:

[0124] Triggering the reception of the PRS sequence in each V2X logical subframe;

[0125] Based on the configuration information, the reception of the PRS sequence is triggered.

[0126] That is to say, in this optional implementation, PRS can be sent on each V2X logical subframe based on the configuration principle, or PRS can be sent periodically based on the configured transmission period.

[0127] Furthermore, as an optional implementation, the method further includes:

[0128] Detecting a PRS sequence at a position corresponding to a subcarrier group; wherein the time domain resource corresponding to the subcarrier group is located at a GP symbol;

[0129] The PRS ID of the first user equipment sending the PRS sequence is determined based on the detected PRS sequence, and the correspondence between the subcarrier group and a group of PRS sequences carried on the subcarrier group (here, a group of PRS sequences is one or more specific PRS sequences) and the PRSID.

[0130] In this optional implementation, based on the frequency domain resources corresponding to the detected PRS sequence (the group number of the subcarrier group carrying the PRS sequence and the PRS sequence number), and the corresponding relationship, the PRS ID configured for the user equipment sending the PRS sequence can be obtained to further achieve synchronization and positioning between the two user equipments.

[0131] Based on the above optional implementation, the method further includes:

[0132] Obtaining phase offset information between the second user equipment and the first user equipment according to the PRS sequence and the PRS ID;

[0133] Based on the phase deviation information, the timing deviation between the second user device and the first user device and / or the position estimation information of the second user device itself are obtained. In this way, the second user device can achieve high-precision synchronization and positioning based on the obtained information and other related information.

[0134] It should also be noted here that, for the receiving user equipment, if it does not have the ability to detect and receive the PRS sequence on the GP symbol, it may not perform any processing after receiving the signal and perform subsequent processing according to the existing standard.

[0135] The embodiment of the present application also provides a PRS transmission device, which is applied to a first user equipment, such as Figure 8 As shown, the device includes:

[0136] The trigger module 801 is used to trigger the sending of PRS according to the configuration principle, wherein the PRS is carried in the GP symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the sending of the PRS is completely independent of the sending of business data.

[0137] Optionally, the trigger module 801 is configured to perform any of the following:

[0138] Triggering the sending of the PRS based on each V2X logical subframe;

[0139] Based on the configuration information, the sending of the PRS is triggered.

[0140] Furthermore, the device further comprises:

[0141] A determination module, configured to determine a subcarrier group number and a PRS sequence number for carrying the PRS based on the PRS ID corresponding to the first user equipment, and a correspondence between a subcarrier group and a group of PRS sequences carried on the subcarrier group and the PRSID;

[0142] A sending module is configured to send the PRS according to the subcarrier group number and the PRS sequence number.

[0143] Optionally, the sending module is specifically configured to: when the PRS sequence number corresponds to multiple PRS sequences, repeatedly send the PRS based on the multiple PRS sequences.

[0144] It should be noted here that the above-mentioned PRS transmission device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned PRS transmission method embodiment applied to the first user equipment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0145] The embodiment of the present application further provides a PRS transmission device, the method is applied to the second user equipment, such as Figure 9 As shown, the device includes:

[0146] The trigger module 901 is used to trigger the reception of the PRS sequence according to the configuration principle, wherein the PRS is carried in the GP symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the reception of the PRS is completely independent of the reception of the service data.

[0147] Optionally, the trigger module 901 is configured to perform any of the following:

[0148] triggering reception of the PRS sequence in each V2X logical subframe;

[0149] Based on the configuration information, reception of the PRS sequence is triggered.

[0150] Furthermore, the device further comprises:

[0151] A detection module, configured to detect a PRS sequence at a position corresponding to a subcarrier group; wherein the time domain resource corresponding to the subcarrier group is located at the GP symbol;

[0152] The determination module is configured to determine the PRS ID of the first user equipment that sends the PRS sequence according to the detected PRS sequence and the correspondence between the subcarrier group and a group of PRS sequences carried on the subcarrier group and the PRS ID.

[0153] Furthermore, the device further comprises:

[0154] A first acquisition module, configured to obtain phase offset information between the second user equipment and the first user equipment according to the PRS sequence and the PRS ID;

[0155] The second acquisition module is configured to obtain the timing offset between the second user equipment and the first user equipment and / or the position estimation information of the second user equipment itself according to the phase offset information.

[0156] It should be noted here that the above-mentioned PRS transmission device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned PRS transmission method embodiment applied to the second user equipment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0157] like Figure 10As shown, an embodiment of the present application provides a user equipment, including a transceiver 1010, a processor 1000, a memory 1020, and a program or instruction stored on the memory 1020 and executable on the processor 1000; when the processor 1000 executes the program or instruction, the PRS transmission method applied to the first user equipment is implemented, or the PRS transmission method applied to the second user equipment is implemented.

[0158] The transceiver 1010 is configured to receive and send data under the control of the processor 1000 .

[0159] Among them, Figure 10 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors represented by processor 1000 and memory represented by memory 1020. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 1010 may be a plurality of components, i.e., including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. For different user devices, the user interface 1030 may also be an interface capable of connecting external or internal devices as required, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, etc.

[0160] The processor 1000 is responsible for managing the bus architecture and general processing, and the memory 1020 can store data used by the processor 1000 when performing operations.

[0161] Those skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware, or may be accomplished by instructing relevant hardware through a computer program, wherein the computer program includes instructions for executing part or all of the steps of the above method; and the computer program may be stored in a readable storage medium, which may be any form of storage medium.

[0162] In addition, an embodiment of the present application further provides a readable storage medium having a program stored thereon. When the program is executed by a processor, the program implements the various processes of the embodiment of the PRS transmission method applied to the first user equipment as described above, or implements the various processes of the embodiment of the PRS transmission method applied to the second user equipment as described above, and can achieve the same technical effects. To avoid repetition, they are not described here. The readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0163] In addition, it should be noted that, in the apparatus and method of the present application, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present application. Moreover, the steps of performing the above-mentioned series of processes can naturally be performed in the order of description or in chronological order, but do not necessarily need to be performed in chronological order, and some steps can be performed in parallel or independently of each other. For those of ordinary skill in the art, it will be understood that all or any steps or components of the method and apparatus of the present application can be implemented in any computing device (including processors, storage media, etc.) or a network of computing devices with hardware, firmware, software or a combination thereof, which can be achieved by those of ordinary skill in the art using their basic programming skills after reading the description of the present application.

[0164] Therefore, the purpose of this application can also be achieved by running a program or a group of programs on any computing device. The computing device can be a well-known general-purpose device. Therefore, the purpose of this application can also be achieved simply by providing a program product containing program code that implements the method or device. In other words, such a program product also constitutes this application, and the storage medium storing such a program product also constitutes this application. Obviously, the storage medium can be any well-known storage medium or any storage medium developed in the future.

[0165] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0166] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A PRS transmission method, characterized in that: Applied to a first user device, comprising: According to the configuration principle, the sending of the positioning reference signal PRS is triggered, wherein the PRS is carried in a guard interval GP symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the sending of the PRS is completely independent of the sending of service data; wherein the GP symbol includes in the time domain: a first GP part, a part for carrying a PRS sequence, and a second GP part, wherein the part for carrying the PRS sequence occupies all subcarriers of the system bandwidth in the frequency domain, and the part for carrying the PRS sequence is one or more.

2. The method according to claim 1, characterized in that According to the configuration principle, the triggering of PRS transmission includes any of the following: Triggering the sending of the PRS based on each V2X logical subframe; Based on the configuration information, the sending of the PRS is triggered.

3. The method according to claim 1, characterized in that The method further comprises: Determine, based on the PRS ID corresponding to the first user equipment, a correspondence between a subcarrier group and a group of PRS sequences carried on the subcarrier group and the PRS ID, a subcarrier group number and a PRS sequence number for carrying the PRS; The PRS is sent according to the subcarrier group number and the PRS sequence number.

4. The method according to claim 3, characterized in that The method includes sending the PRS according to the subcarrier group number and the PRS sequence number, comprising: In a case where the PRS sequence number corresponds to multiple PRS sequences, the PRS is repeatedly transmitted based on the multiple PRS sequences.

5. The method according to claim 3, characterized in that The principle for allocating frequency domain resources carrying PRS sequences to each PRS ID is at least one of the following multiplexing principles: Frequency domain reuse is prioritized; Code domain multiplexing is prioritized; One PRS ID corresponds to one user equipment.

6. The method according to claim 1, wherein The subcarriers used to carry the PRS sequence include multiple orthogonal subcarrier groups, and the adjacent subcarriers in each subcarrier group are equidistant in the frequency domain, wherein the number of the orthogonal subcarrier groups is the ratio of the total number of subcarriers carrying the PRS sequence in the system to the frequency domain multiplexing factor between users, and each user equipment sends the PRS sequence only on one subcarrier group.

7. The method according to claim 6, characterized in that The PRS sequence adopts a ZC sequence, wherein the value of the ZC sequence is determined by the length of a first sequence for generating the ZC sequence, and the length of the first sequence is related to the number of subcarriers in the subcarrier group.

8. The method according to claim 6, characterized in that Through code division multiplexing, the subcarriers in each subcarrier group can be used to send multiple groups of PRS sequences; wherein each subcarrier group and a group of PRS sequences carried by the subcarrier group correspond to a PRS ID, and each PRS ID corresponds to a user equipment.

9. A PRS transmission method, characterized in that: Applied to a second user device, comprising: According to the configuration principle, the reception of the PRS sequence is triggered, wherein the PRS is carried in the GP symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the reception of the PRS is completely independent of the reception of the service data; wherein the GP symbol includes in the time domain: a first GP part, a part for carrying the PRS sequence, and a second GP part, wherein the part for carrying the PRS sequence occupies all subcarriers of the system bandwidth in the frequency domain, and the part for carrying the PRS sequence is one or more.

10. The method according to claim 9, characterized in that According to the configuration principle, the reception of the PRS sequence is triggered by any of the following: triggering reception of the PRS sequence in each V2X logical subframe; Based on the configuration information, reception of the PRS sequence is triggered.

11. The method according to claim 9, characterized in that The method further comprises: Detecting a PRS sequence at a position corresponding to a subcarrier group; wherein the time domain resource corresponding to the subcarrier group is located at the GP symbol; The PRS ID of the first user equipment that sends the PRS sequence is determined according to the detected PRS sequence and the correspondence between the subcarrier group, a group of PRS sequences carried on the subcarrier group, and the PRSID.

12. The method according to claim 11, characterized in that The method further comprises: Obtaining phase offset information between the second user equipment and the first user equipment according to the PRS sequence and the PRS ID; According to the phase deviation information, the timing deviation between the second user equipment and the first user equipment and / or the position estimation information of the second user equipment itself are obtained.

13. The method according to claim 12, characterized in that The subcarriers used to carry the PRS sequence include multiple orthogonal subcarrier groups, and the adjacent subcarriers in each subcarrier group are equidistant in the frequency domain, wherein the number of the orthogonal subcarrier groups is the ratio of the total number of subcarriers carrying the PRS sequence in the system to the frequency domain multiplexing factor between users, and each user equipment sends the PRS sequence only on one subcarrier group.

14. The method according to claim 13, characterized in that The PRS sequence adopts a ZC sequence, wherein the value of the ZC sequence is determined by the length of a first sequence for generating the ZC sequence, and the length of the first sequence is related to the number of subcarriers in the subcarrier group.

15. A PRS transmission device, characterized in that: Applied to a first user device, comprising: A trigger module is used to trigger the sending of a positioning reference signal PRS according to a configuration principle, wherein the PRS is carried in a guard interval GP symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the sending of the PRS is completely independent of the sending of service data; wherein the GP symbol includes in the time domain: a first GP part, a part for carrying a PRS sequence, and a second GP part, wherein the part for carrying the PRS sequence occupies all subcarriers of the system bandwidth in the frequency domain, and the part for carrying the PRS sequence is one or more.

16. A PRS transmission device, characterized in that: Applied to a second user device, comprising: A trigger module is used to trigger the reception of a positioning reference signal (PRS) sequence according to a configuration principle, wherein the PRS is carried in a guard interval (GP) symbol, the GP symbol is completely independent of other symbols in the frame structure where the GP symbol is located, and the reception of the PRS is completely independent of the reception of service data; wherein the GP symbol includes in the time domain: a first GP part, a part for carrying the PRS sequence, and a second GP part, wherein the part for carrying the PRS sequence occupies all subcarriers of the system bandwidth in the frequency domain, and the part for carrying the PRS sequence is one or more.

17. A user equipment comprising a transceiver, a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the processor implements the PRS transmission method according to any one of claims 1 to 8, or implements the PRS transmission method according to any one of claims 9 to 15.

18. A readable storage medium having a program or instruction stored thereon, characterized in that: When the program or instruction is executed by a processor, the PRS transmission method according to any one of claims 1 to 8 is implemented, or the PRS transmission method according to any one of claims 9 to 15 is implemented.

Images