Method and apparatus for transmitting a sensing signal with a virtual cyclic prefix
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZTE CORP
- Filing Date
- 2024-01-15
- Publication Date
- 2026-08-07
Smart Images
Figure CN122536097A_ABST
Abstract
Description
Technical Field
[0001] This patent document relates to wireless communication and sensing. Background Technology
[0002] Mobile telecommunications technologies are driving the world toward an increasingly connected and networked society. Compared to existing wireless networks, next-generation systems and communication technologies will need to support a wider range of use case characteristics and provide more complex and granular access requirements and flexibility. Summary of the Invention
[0003] This patent document discloses, among other things, techniques related to processing signals on the transmission side by adding window functions in integrated sensing and communication (ISAC) systems or other wireless communication systems.
[0004] In one example aspect, a wireless communication method is disclosed. The method includes: transmitting a sensing signal by a first electrical device, wherein the sensing signal includes one or more orthogonal frequency division multiplexing (OFDM) symbols, and a cyclic prefix (CP) is inserted before each OFDM symbol; wherein the CP is identical to a first end portion of the OFDM symbol; and wherein the CP, plus a start portion of the OFDM symbol, forms a virtual CP, and the virtual CP is identical to a second end portion of the OFDM symbol.
[0005] In another example, a wireless communication method is disclosed. The method includes receiving a sensing signal as described above by a first electrical device.
[0006] In yet another example, a wireless communication device is disclosed, which includes a processor configured or operable to perform the methods described above.
[0007] In yet another example, a computer-readable storage medium is disclosed. The computer-readable storage medium stores code that, when executed by a processor, causes the processor to perform the methods described above. Attached Figure Description
[0008] Figure 1 A schematic diagram illustrating an example of transmitting and receiving signals in a wireless communication system is shown.
[0009] Figures 2 to 3 A schematic diagram illustrating an example involving a wireless communication system is shown.
[0010] Figures 4 to 8 A schematic diagram is shown illustrating an example of using sequence design to generate a sensing signal with a virtual CP.
[0011] Figure 9A schematic diagram is shown illustrating an example of generating a sensing signal with a comb-shaped frequency pattern.
[0012] Figure 10 An exemplary block diagram of a hardware platform that may be part of a network device or a communication device is shown.
[0013] Figure 11 Examples of network communications including a base station (BS) and a user equipment (UE) according to some embodiments of the disclosed technology are shown.
[0014] Figures 12 to 13 This is a flowchart representation of a method for wireless communication according to one or more embodiments of the present technology. Detailed Implementation
[0015] The headings for each section below are for ease of understanding of the disclosed subject matter and do not in any way limit the scope of the claimed subject matter. Therefore, one or more features of one section may be combined with one or more features of another section. Furthermore, for clarity, the terms 6G or Integrated Sensing and Communication (ISAC) are used. Nevertheless, the techniques disclosed in this document are not limited to 6G or ISAC technologies and can be used in wireless systems implementing other protocols.
[0016] As a popular 6G technology, ISAC is expected to add considerable value to wireless communication systems. Widely deployed communication infrastructure can be enhanced to provide radar services such as traffic control and monitoring, drone detection, and railway obstacle detection. ISAC can also be implemented in various mobile communication devices in scenarios such as autonomous driving, smart homes, and healthcare.
[0017] The rapid development of ISAC has made it very promising for 6G technology. ISAC enables future communication systems to not only transmit data, but also extract valuable information from the physical world.
[0018] ISAC has garnered increasing attention from both academia and industry, leading to increased research investment. For example, global standardization related to ISAC has been initiated. Feasibility studies for ISAC began with 3GPP Release 19, and the ITU has adopted ISAC as one of the six key use cases for 6G. However, one of the challenges facing ISAC is that the cyclic prefix (CP) length is insufficient to meet the sensing requirements of the transmitted signals.
[0019] Typically, the cyclic prefix (CP) is formatted as a slot-wise configuration, meaning that symbols within a slot require a single configuration, which can be either a regular cyclic prefix (NCP) or an extended cyclic prefix (ECP). However, using ECP instead of NCP increases the CP length. For example, this would be a waste of resources if some symbols in a slot do not require ECP. Furthermore, in some cases, using ECP might be too short for the sensed signal, potentially causing problems. Additionally, introducing a new CP length could lead to compatibility issues in existing networks.
[0020] One solution to the CP length problem is virtual CP. Virtual CP can reuse existing CP schemes.
[0021] CP length is defined by the following formula:
[0022] ,
[0023] in It is the parameter set index, and It is the symbol index in the subframe.
[0024] To distinguish it from the virtual CP, we refer to the standard CP as the real CP. Furthermore, in one or more embodiments described herein, the sensing signal transmitted on an orthogonal frequency division multiplexing (OFDM) symbol may be designed to have a standard CP (i.e., the real CP), which is equivalent to a shorter symbol with a longer virtual CP.
[0025] according to Figure 1 The standard CP can have the same end as the original OFDM symbol.
[0026] The method and scheme proposed in this application are advantageous in allowing sequences used by sensing signals to have the characteristic that when the virtual CP consists of the start portion of a standard CP and the original symbol, the virtual CP is identical to the end portion of the OFDM symbol. Furthermore, the proposed method and scheme can be implemented without altering the features used for protocol compatibility.
[0027] The details of the proposed method will be discussed in the following embodiments.
[0028] Example 1
[0029] This section discloses, among other things, examples of transmitting and receiving sensing signals between wireless nodes / devices (i.e., single-site sensing).
[0030] Here, the wireless node can be a base station (BS); the wireless device can be a user equipment (UE).
[0031] In one example of single-station sensing, such as Figure 2 As shown, BS 202 or UE 204 transmits sensing signal 214. Sensing signal 214 is transmitted in an OFDM symbol with NCP or ECP.
[0032] Here, sensing signal 214 supports virtual CP 208, which results in a longer sensing coverage area.
[0033] The virtual CP 208 consists of the standard CP (i.e., the real CP 206) and the start portion 210 of the OFDM symbol, and is similar to the standard CP 206. The virtual CP 208 is identical to the end portion 212 of the OFDM symbol.
[0034] In one example, on the receiver side, virtual CP 208 is removed, and the remainder of the OFDM symbol is processed. Here, as Figure 2 As shown in the example, the receiver-side BS 202 or UE 204 can process the virtual CP 208 after receiving the reflected sensing signal 216.
[0035] In another example, the configuration of the sensing signal with virtual CP 208 can be transmitted from the sensing function (SF) to the BS, and then from the BS to the UE. SF is the sensing-related network element.
[0036] The configuration in the example includes the length of the virtual CP 208, or it may include the shortened symbol length, resource location, comb size, and sensed repetition factor.
[0037] Example 2
[0038] This section discloses, among other things, examples of transmitting and receiving sensing signals between multiple wireless nodes / devices (i.e., dual-station sensing).
[0039] Here, the wireless node can be a first base station (BS) and a second BS; the wireless device can be a first user equipment (UE) and a second UE.
[0040] In one example of dual-station sensing, such as Figure 3 As shown, BS 302 or UE 304 transmits sensing signal 310. Sensing signal 310 is transmitted in an OFDM symbol with NCP or ECP. Here, sensing signal 310 supports virtual CP 312, which results in a longer sensing coverage area.
[0041] The virtual CP 312 consists of the standard CP (i.e., the real CP 314) and the start portion 316 of the OFDM symbol, and is similar to the standard CP 314. The virtual CP 312 is the same as the end portion 318 of the OFDM symbol.
[0042] In one example, on the receiver side, the virtual CP 312 is removed, and the remainder of the OFDM symbol is processed. Here, as Figure 3 As shown in the example, the receiver-side BS 308 or UE 304 can process the virtual CP 312 after receiving the reflected sensing signal 320.
[0043] In another example, the configuration of the sensing signal with virtual CP 312 can be transmitted from the SF to the BS, and then from the BS to the UE. This configuration includes the length of the virtual CP 312, or it may include a shortened symbol length, resource location, comb size, and sensing repetition factor.
[0044] Example 3
[0045] This embodiment discloses, among other things, an example of using sequence design to generate a sensing signal with a virtual CP.
[0046] Here, the sequence can have a start part and an end part.
[0047] In one example, such as Figure 4 As shown, the start portion 402 of sequence 400 can be [B, A], and the end portion 404 of the sequence can be [A, B, A], where the length of A can be equal to the length of the standard CP (i.e., the real CP 406). Here, the OFDM symbol adds the standard CP 406 (i.e., the length of A) to the start portion 402 of sequence 400 before the OFDM symbol. This process produces a virtual CP 408 of [A, B, A].
[0048] In another example, such as Figure 4 As shown, the resulting virtual CP 408 can be longer than the original length of the standard CP 406.
[0049] Example 4
[0050] This embodiment discloses, among other things, an example of using sequence design to generate a sensing signal with a virtual CP.
[0051] As disclosed in the above embodiments, the sequence may have a start portion and an end portion.
[0052] In one example, such as Figure 5As shown, the start portion 502 of sequence 500 can be [A], where B is empty. Therefore, since B is empty, the end portion 504 of the sequence can be [A, A], where the length of A can be equal to the length of the standard CP (i.e., the real CP 506). Here, the OFDM symbol adds the standard CP 506 (i.e., the length of A) to the start portion 502 of sequence 500 before the OFDM symbol. This process produces a virtual CP 508 of [A, A].
[0053] In another example, such as Figure 5 As shown, the resulting virtual CP 508 can be longer than the original length of the standard CP 506.
[0054] Example 5
[0055] This embodiment discloses, among other things, an example of using sequence design to generate a sensing signal with a virtual CP.
[0056] In one example, such as Figure 6 As shown, sequence 600 begins with B and alternates between B and A, thus creating the sequence [B, A, B, A, B, A, B, A, B, A].
[0057] As disclosed in the above embodiments, the length of A can be equal to the length of the standard CP (i.e., the real CP 602). Here, the OFDM symbol adds the standard CP 602 (i.e., the length of A) to the start portion 604 of sequence 600, before the OFDM symbol. This process will produce a virtual CP 606 of [A, B, A].
[0058] In another example, such as Figure 6 As shown, the resulting virtual CP 606 can be longer than the original length of the standard CP 602.
[0059] Example 6
[0060] This embodiment discloses, among other things, an example of using sequence design to generate a sensing signal with a virtual CP.
[0061] The example shown here will work when ECP is used as the symbol length. In some examples, the symbol length can be an integer multiple of the length of ECP.
[0062] In one example, such as Figure 7 As shown, sequence 700 begins with A and continues with A until it reaches the end part 702. Here, B is empty, thus producing the sequence [A, A, A, A].
[0063] As disclosed in the above embodiments, the length of A can be equal to the length of the standard CP (i.e., the actual CP 704). Here, the OFDM symbol adds the standard CP 704 (i.e., the length of A) to the start portion 706 of sequence 700, before the OFDM symbol. This process produces a virtual CP 708 of [A, A].
[0064] In another example, such as Figure 7 As shown, the resulting virtual CP 708 can be longer than the original length of the standard CP 704.
[0065] Example 7
[0066] This embodiment discloses, among other things, an example of using sequence design to generate a sensing signal with a virtual CP.
[0067] As disclosed in the above embodiments, the sequence may have a start portion and an end portion.
[0068] In one example, such as Figure 8 As shown, the start portion 802 of sequence 800 can be [B, A], and the end portion 804 of the sequence can be [A, B, A, B, A], where the length of A can be equal to the length of the standard CP (i.e., the real CP 806). Here, the OFDM symbol adds the standard CP 806 (i.e., the length of A) to the start portion 802 of sequence 800 before the OFDM symbol. This process produces a virtual CP 808 of [A, B, A, B, A].
[0069] In another example, such as Figure 8 As shown, the resulting virtual CP 808 can be longer than the original length of the standard CP 806.
[0070] In these examples, additional parameters may be required during sequence design. Such parameters may include, but are not limited to: OFDM symbol duration, channel delay spread, sampling rate, and general system parameters (i.e., bandwidth, spacing, etc. allocated to OFDM symbols).
[0071] Example 8
[0072] This embodiment discloses, among other things, an example of generating a sensing signal using a comb-shaped frequency pattern.
[0073] Here, in the frequency domain, the comb frequency can generate repeating portions of OFDM symbols. In some examples, the number of repeating portions for an OFDM symbol can represent the period, which can be equal to the comb size.
[0074] In one example, such as Figure 9 As shown, the comb size is selected from a subcarrier index 902 with 12 subcarriers. In the frequency domain, selective subcarriers 906 are allowed. For example, a subcarrier can be selected at every other subcarrier position within subcarrier index 902. For example, as... Figure 9 As shown, the selective subcarrier 906 can be [0, 4, 8]. Here, the comb size will be equal to 4.
[0075] Furthermore, in this example, to generate the sensing signal using a comb frequency, the starting subcarrier of the comb frequency is a non-negative integer multiple of the comb size. Otherwise, a virtual CP cannot be implemented. Figure 9 As shown, subcarrier index 902 is a non-negative integer multiple of the comb size, while subcarrier index 904 is not. If the selective subcarrier is selected from subcarrier index 904, the resulting sensing signal 908 with virtual CP 910 will not be generated.
[0076] System Overview
[0077] Figure 10 An exemplary block diagram of a hardware platform 1000 is shown. The hardware platform 1000 may be part of an electrical device, such as a network device (e.g., a base station) or a communication device (e.g., a user equipment (UE)), such as the first or second electrical device disclosed in this document. The hardware platform 1000 includes at least one processor 1010 and a memory 1005 on which instructions are stored. When executed by the processor 1010, the instructions configure the hardware platform 1000 to perform… Figures 1 to 9 The operations described herein and the operations in the various embodiments described in this patent application document. Transmitter 1015 transmits or sends information or data to another device. For example, a network device transmitter may send a message to a user equipment. Receiver 1020 receives information or data transmitted or sent by another device. For example, a user equipment may receive a message from a network device.
[0078] The implementation methods discussed above will be applied to wireless communication. Figure 11An example of a communication system (e.g., a 6G or NR cellular network) is shown, comprising a base station 1120 and one or more user equipments (UEs) 1111, 1112, and 1113. In some embodiments, the UE accesses the BS (e.g., the network) using a communication link to the network (sometimes referred to as the uplink direction, as depicted by dashed arrows 1131, 1132, and 1133), which then enables subsequent communication from the BS to the UE (e.g., shown as the direction from the network to the UE, sometimes referred to as the downlink direction, as depicted by arrows 1141, 1142, and 1143). In some embodiments, the BS sends information to the UE (sometimes referred to as the downlink direction, as depicted by arrows 1141, 1142, and 1143), which then enables subsequent communication from the UE to the BS (e.g., shown as the direction from the UE to the BS, sometimes referred to as the uplink direction, as depicted by dashed arrows 1131, 1132, and 1133). UE can be, for example, a smartphone, tablet, mobile computer, machine-to-machine (M2M) device, Internet of Things (IoT) device, etc.
[0079] Example technical solutions
[0080] Figure 12 An example flowchart representation of a method for wireless communication according to one or more embodiments of the present technology is shown. Operation 1202 includes: transmitting a sensing signal by a first electrical device, wherein the sensing signal includes one or more orthogonal frequency division multiplexing (OFDM) symbols, and a CP is inserted before each OFDM symbol; wherein the CP is identical to a first end portion of the OFDM symbol; and wherein the CP plus the start portion of the OFDM symbol forms a virtual CP, and the virtual CP is identical to a second end portion of the OFDM symbol. Furthermore, each of the sensing transmission units can be configured to have the same duration as a data transmission unit including a data loop prefix and data symbols. Furthermore, the duration of the virtual loop prefix can be greater than the duration of the loop prefix, and the duration of the shortened symbol can be less than the duration of the data symbol.
[0081] Figure 13An example flowchart representation of a method for wireless communication according to one or more embodiments of the present technology is shown. Operation 1302 includes: receiving a sensing signal by a first electrical device, wherein the sensing signal includes one or more orthogonal frequency division multiplexing (OFDM) symbols, and a cyclic prefix is inserted before each OFDM symbol; wherein the cyclic prefix is identical to a first end portion of the OFDM symbol; and wherein the cyclic prefix plus the start portion of the OFDM symbol forms a virtual CP, and the virtual CP is identical to a second end portion of the OFDM symbol. Furthermore, each of the sensing transmission units can be configured to have the same duration as a data transmission unit including a data cyclic prefix and data symbols. Furthermore, the duration of the virtual cyclic prefix can be greater than the duration of the cyclic prefix, and the duration of the shortened symbol can be less than the duration of the data symbol.
[0082] The above description Figures 12 to 13 Various preferred embodiments and additional features of the method are as follows. Further examples are described with reference to embodiments 1 to 8.
[0083] In one example aspect, a wireless communication method is disclosed. The method includes transmitting a sensing signal by a first electrical device, wherein the sensing signal includes one or more orthogonal frequency division multiplexing (OFDM) symbols, and a cyclic prefix (CP) is inserted before each OFDM symbol; wherein a cyclic prefix is identical to a first end portion of the OFDM symbol; and wherein the CP, plus the start portion of the OFDM symbol, forms a virtual CP, and the virtual CP is identical to a second end portion of the OFDM symbol.
[0084] In another example, a different wireless communication method is disclosed. The method includes receiving a sensing signal by a first electrical device, wherein the sensing signal comprises one or more orthogonal frequency division multiplexing (OFDM) symbols, and a cyclic prefix is inserted before each OFDM symbol; wherein the cyclic prefix is identical to a first ending portion of the OFDM symbol; and wherein the cyclic prefix plus the starting portion of the OFDM symbol forms a virtual CP, and the virtual CP is identical to a second ending portion of the OFDM symbol. Upon receiving the sensing signal, the first electrical device can use the sensing signal to perform additional operations, such as measuring the sensing signal and deriving information for further wireless communication based on the sensing signal.
[0085] In some embodiments, the cyclic prefix is 1) a regular cyclic prefix or 2) an extended cyclic prefix.
[0086] In some embodiments, orthogonal frequency division multiplexing symbols carry sequences.
[0087] In some embodiments, the sequence comprises at least two first parts and at least one second part, and each of the at least one second part is inserted between the two first parts.
[0088] In some embodiments, the length of a first part plus a second part is the length of the cyclic prefix.
[0089] In some embodiments, the sequence includes at least one third part.
[0090] In some embodiments, the length of a second part is the length of the cyclic prefix.
[0091] In some embodiments, the sequence is generated by a comb frequency pattern, which includes a start subcarrier index that is a non-negative integer multiple of the comb size.
[0092] In some embodiments, the method disclosed above further includes: transmitting virtual cyclic prefix configuration from the network element to the base station.
[0093] In some embodiments, the method disclosed above further includes transmitting a virtual cyclic prefix configuration to a user equipment.
[0094] In some embodiments, the virtual loop prefix configuration includes at least one of the following: 1) virtual loop prefix length; 2) resource location; 3) comb size; and 4) sensed repetition factor.
[0095] In some embodiments, the method disclosed above further includes removing the virtual loop prefix before processing.
[0096] In some embodiments, the second electrical device is also capable of receiving a sensing signal generated by a comb frequency pattern, the comb frequency pattern including a start subcarrier index that is a non-negative integer multiple of the comb size.
[0097] In some embodiments, the first electrical device or the second electrical device is at least one of the following: 1) a base station; 2) a user equipment; or 3) a dedicated sensing terminal.
[0098] It will be appreciated that this document discloses methods and apparatus related to a structure that realizes the technical impact of virtual CP for use in ISAC or other wireless communication systems. While ISAC has received attention in academia, existing research on ISAC or other communication systems does not cover configuration schemes involving the transmission and reception of sensing signals with virtual CP to extend the length of the standard CP to meet sensing requirements. This patent application discloses various solutions regarding: 1) how sensing signals on the transmission medium are configured with virtual CP and shortened symbols, and how sensing signals with virtual CP are transmitted; and 2) how sensing signals are received. The proposed methods and schemes will improve communication efficiency and accuracy in ISAC and other wireless communication systems, at least by utilizing longer virtual CPs to meet sensing requirements.
[0099] The disclosed embodiments and other embodiments, modules, and functional operations described in this document can be implemented in digital electronic circuits, or in computer software, firmware, or hardware (including the structures disclosed in this document and their structural equivalents), or in one or more combinations thereof. The disclosed embodiments and other embodiments can be implemented as one or more computer program products, i.e., one or more computer program instruction modules encoded on a computer-readable medium for execution by or control of the operation of a data processing apparatus. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of material that implements machine-readable propagation signals, or one or more combinations thereof. The term "data processing apparatus" covers all means, devices, and machines for processing data, including, by way of example, a programmable processor, a computer, or multiple processors or computers. In addition to hardware, the apparatus may include code that creates an execution environment for the computer program in discussion, such as code constituting processor firmware, a protocol stack, a database management system, an operating system, or one or more combinations thereof. A propagation signal is an artificially generated signal, such as a machine-generated electrical signal, optical signal, or electromagnetic signal, which is generated to encode information for transmission to a suitable receiver device.
[0100] Computer programs (also known as programs, software, software applications, scripts, or code) can be written in any programming language, including compiled or interpreted languages; and can be deployed in any form, including as standalone programs or as modules, components, subroutines, or other units suitable for a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored as part of a file containing other programs or data (e.g., one or more scripts stored in a markup language document), as a single file dedicated to the program in question, or as multiple co-located files (e.g., a file storing one or more modules, subroutines, or portions of code). A computer program can be deployed to execute on a single computer, or on multiple computers located at a single site or distributed across multiple sites and interconnected via a communication network.
[0101] The processes and logic flows described in this document can be executed by one or more programmable processors that execute one or more computer programs to perform functions by manipulating input data and generating outputs. The processes and logic flows can also be executed by special-purpose logic circuitry (e.g., FPGA (Field-Programmable Gate Array) or ASIC (Application-Specific Integrated Circuit)), and devices can also be implemented as such special-purpose logic circuitry.
[0102] Processors suitable for executing computer programs include, by way of example, both general-purpose microprocessors and special-purpose microprocessors, as well as any one or more processors in any kind of digital computer. Typically, a processor receives instructions and data from read-only memory or random access memory, or both. The fundamental elements of a computer are a processor for executing instructions and one or more memory devices for storing instructions and data. Typically, a computer will also include, or be operatively coupled to, one or more mass storage devices (e.g., disks, magneto-optical disks, or optical disks) for storing data, to receive data from, to, or both of these devices. However, a computer does not necessarily have such devices. Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and memory devices, including, by way of example, semiconductor memory devices such as EPROM, EEPROM, and flash memory devices; disks such as internal hard disks or removable disks; magneto-optical disks; and CD-ROM and DVD-ROM discs. Processors and memory may be supplemented by, or incorporated into, special-purpose logic circuitry.
[0103] While this document contains numerous details, these details should not be construed as limiting the scope of the claimed invention or the scope of what may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features described in this document within the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments. Furthermore, although features may be described above as operating in certain combinations, or even initially claimed in this way, one or more features from a claimed combination may be removed from that combination in some cases, and the claimed combination may involve sub-combinations or variations thereof. Similarly, although operations are depicted in a particular order in the drawings, this should not be construed as requiring such operations to be performed in the specific order shown or in sequential order, or requiring the performance of all shown operations to achieve the desired result.
[0104] Only a few examples and implementations are disclosed. Variations, modifications, and enhancements can be made to the described examples, implementations, and other implementations based on the disclosed content.
Claims
1. A method for wireless communication, comprising: The sensing signal is transmitted by the first electrical device. The sensing signal includes one or more orthogonal frequency division multiplexing symbols, and a cyclic prefix is inserted before each orthogonal frequency division multiplexing symbol; Wherein, the cyclic prefix is the same as the first end portion of the orthogonal frequency division multiplexing symbol; and The cyclic prefix plus the starting part of the orthogonal frequency division multiplexing symbol forms a virtual cyclic prefix, and the virtual cyclic prefix is the same as the second ending part of the orthogonal frequency division multiplexing symbol.
2. A method for wireless communication, comprising: The sensing signal is received by the first electrical device. The sensing signal includes one or more orthogonal frequency division multiplexing symbols, and a cyclic prefix is inserted before each orthogonal frequency division multiplexing symbol; Wherein, the cyclic prefix is the same as the first end portion of the orthogonal frequency division multiplexing symbol; and The cyclic prefix plus the starting part of the orthogonal frequency division multiplexing symbol forms a virtual cyclic prefix, and the virtual cyclic prefix is the same as the second ending part of the orthogonal frequency division multiplexing symbol.
3. The method according to claim 1 or 2, wherein, The cyclic prefix is either 1) a regular cyclic prefix or 2) an extended cyclic prefix.
4. The method according to the preceding claims, wherein, The orthogonal frequency division multiplexing symbol carrier sequence.
5. The method according to claim 4, wherein, The sequence comprises at least two first parts and at least one second part, and each of the at least one second part is inserted between the two first parts.
6. The method according to claim 5, wherein, The length of the first part plus the length of the second part is the length of the cyclic prefix.
7. The method according to claim 4, wherein, The sequence includes at least one third part.
8. The method according to claim 7, wherein, The length of a second part is the length of the cyclic prefix.
9. The method according to claim 7, wherein, The sequence is generated by a comb frequency pattern, which includes a starting subcarrier index that is a non-negative integer multiple of the comb size.
10. The method according to claim 1 or 2, further comprising: The network element transmits the virtual cyclic prefix configuration to the base station.
11. The method according to claim 1 or 2, further comprising: Transmit the virtual cyclic prefix configuration to the user equipment.
12. The method according to claim 10 or 11, wherein, The virtual loop prefix configuration includes at least one of the following: 1) virtual loop prefix length; 2) resource location; 3) comb size; and 4) sensed repetition factor.
13. The method according to claim 2, further comprising: Remove the virtual loop prefix before processing.
14. The method according to claim 1 or 2, wherein, The second electrical device is also capable of receiving the sensing signal generated by a comb frequency pattern, the comb frequency pattern including a start subcarrier index that is a non-negative integer multiple of the comb size.
15. The method according to claim 1 or 2, wherein, The first electrical device or the second electrical device is at least one of the following: 1) a base station; 2) a user equipment; or 3) a dedicated sensing terminal.
16. An apparatus for a communication network, comprising: A processor configured to implement the method according to any one of claims 1 to 15.
17. A computer-readable storage medium having code stored thereon, which, when executed by a processor, causes the processor to perform the method according to any one of claims 1 to 15.