Method, device and computer readable medium for communication

Abstract

The embodiment of the invention relates to a communication method, equipment and a computer readable medium. The first device performs a first type LBT process in an unlicensed band. The first device transmits a first sidelink positioning reference signal (PRS) sequence for ranging between the first device and the second device and / or for positioning of the first device to the second device in an unlicensed frequency band in response to successful execution of the first type of LBT process. The first sidelink PRS sequence is associated with a first type of LBT process and / or a second type of LBT process to be performed by a second device for transmitting a second sidelink PRS sequence to the first device in an unlicensed band for ranging or positioning.

Description

Technical Field

[0001] Implementations of the present disclosure relate generally to the field of telecommunications, and in particular to methods, devices, and computer-readable media for communications. Background Art

[0002] The communication system enables vehicle-to-everything (V2X) and device-to-device (D2D) communications to be performed. V2X communications may be based on communication technologies such as sidelink communication technologies. To this end, a sidelink resource pool and a sidelink channel may be established for vehicles participating in such communications. Summary of the invention

[0003] In general, example implementations of the present disclosure provide methods, devices, and computer-readable media for communications.

[0004] In a first aspect, a first device is provided. The first device includes: at least one processor and at least one memory, including computer program code. The at least one memory and the computer program code are configured to, together with the at least one processor, enable the first device to: perform a first type of listen-before-talk (LBT) process in an unlicensed band; in response to successful execution of the first type of LBT process, send a first sidelink positioning reference signal (PRS) sequence for ranging between the first device and the second device, and / or for positioning of the first device to a second device in the unlicensed band. The first sidelink PRS sequence is associated with the first type of LBT process and / or a second type of LBT process to be performed by the second device, and the second type of LBT process is used to send a second sidelink PRS sequence to the first device in the unlicensed band for ranging or positioning.

[0005] In a second aspect, a second device is provided. The second device includes: at least one processor and at least one memory, including computer program code. The at least one memory and the computer program code are configured to, together with the at least one processor, enable the second device to: detect a first sidelink PRS sequence sent by a first device in an unlicensed band for ranging between the first device and the second device and / or for positioning of the first device; based on the first sidelink PRS sequence, determine a first type of LBT process performed by the first device for transmission of the first sidelink PRS sequence in the unlicensed band; based on the first type of LBT process, determine a second type of LBT process; and perform a second type of LBT process for transmitting a second sidelink PRS sequence to the first device in the unlicensed band for ranging or positioning.

[0006] In a third aspect, a method implemented at a first device is provided. The method includes: performing a first type LBT process in an unlicensed band by the first device; and in response to successful execution of the first type LBT process, sending a first sidelink PRS sequence for ranging between the first device and the second device and / or for positioning of the first device to a second device in the unlicensed band, wherein the first sidelink PRS sequence is associated with the first type LBT process and / or a second type LBT process to be performed by the second device, the second type LBT process being used to send a second sidelink PRS sequence to the first device in the unlicensed band for ranging or positioning.

[0007] In a fourth aspect, a method implemented at a second device is provided. The method includes: detecting, by the second device, a first sidelink PRS sequence sent by a first device in an unlicensed band for ranging between the first device and the second device and / or for positioning of the first device; determining, based on the first sidelink PRS sequence, a first type of LBT process for transmission of the first sidelink PRS sequence performed by the first device; determining, based on the first type of LBT process, a second type of LBT process; and performing a second type of LBT process for transmitting a second sidelink PRS sequence to the first device in the unlicensed band for ranging or positioning.

[0008] In a fifth aspect, an apparatus is provided. The apparatus includes: a component for performing a first type LBT process in an unlicensed band by a first device; and a component for sending a first sidelink PRS sequence for ranging between the first device and the second device, and / or for positioning the first device to a second device in the unlicensed band in response to successful execution of the first type LBT process, wherein the first sidelink PRS sequence is associated with the first type LBT process and / or a second type LBT process to be performed by the second device, the second type LBT process being used to send a second sidelink PRS sequence to the first device in the unlicensed band for ranging or positioning.

[0009] In a sixth aspect, an apparatus is provided. The apparatus includes: a component for detecting, by a second device, a first sidelink PRS sequence sent by a first device in an unlicensed band for ranging between the first device and the second device and / or for positioning of the first device; a component for determining, based on the first sidelink PRS sequence, a first type of LBT process performed by the first device for transmitting the first sidelink PRS sequence; a component for determining a second type of LBT process based on the first type of LBT process; and a component for performing a second type of LBT process for transmitting a second sidelink PRS sequence to the first device in the unlicensed band for ranging or positioning.

[0010] In a seventh aspect, a non-transitory computer-readable medium is provided, wherein the non-transitory computer-readable medium comprises program instructions for causing an apparatus to execute the method according to the third aspect.

[0011] In an eighth aspect, a non-transitory computer-readable medium is provided, wherein the non-transitory computer-readable medium comprises program instructions for causing an apparatus to execute the method according to the fourth aspect.

[0012] It should be understood that the invention summary is not intended to identify the key or essential features of the implementation of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of some implementations of the present disclosure in the accompanying drawings, in which:

[0014] Figure 1 An example communication network is shown in which implementations of the present disclosure may be implemented;

[0015] Figure 2 An example of a clear channel assessment (CCA) slot according to some implementations of the present disclosure is shown;

[0016] Figure 3 An example of obtaining a channel occupancy time (COT) according to some implementations of the present disclosure is shown;

[0017] Figure 4 An example of a contention window countdown process according to some implementations of the present disclosure is shown;

[0018] Figure 5A and Figure 5B Examples of allowed gaps for which a Type 2 LBT process may be applied according to some implementations of the present disclosure are respectively shown;

[0019] Figure 6 An example is shown in which an initiator device according to implementation uses different types of LBT processes to communicate with multiple responding devices under respectively acquired COTs through a side link (SL);

[0020] Figure 7 A signaling diagram illustrating a process for ranging or positioning according to some implementations of the present disclosure is shown;

[0021] Fig. 8A , Figure 8B and Figure 8C Examples of frame structures for transmission of a first sidelink PRS sequence according to some implementations of the present disclosure are respectively shown;

[0022] Fig. 9 A flowchart illustrating an example method according to some implementations of the present disclosure;

[0023] Fig.10 A flowchart illustrating another example method according to some implementations of the present disclosure is shown;

[0024] Fig.11 A flowchart illustrating an example method according to other implementations of the present disclosure;

[0025] Fig.12 shows a simplified block diagram of an apparatus suitable for implementing an embodiment of the present disclosure; and

[0026] Fig.13 A block diagram of an example computer-readable medium is shown in accordance with some implementations of the present disclosure.

[0027] In the drawings, the same or similar reference numerals denote the same or similar elements. DETAILED DESCRIPTION

[0028] The principles of the present disclosure will now be described with reference to some example implementations. It should be understood that these implementations are described only for illustrative purposes and to help those skilled in the art understand and implement the present disclosure without implying any limitation on the scope of the present disclosure. The present disclosure described herein can be implemented in various ways except for the way described below.

[0029] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0030] In this disclosure, references to "one embodiment," "an embodiment," "an example embodiment," etc. indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes the particular feature, structure, or characteristic. Furthermore, these phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, those skilled in the art recognize that, whether or not explicitly described, it is within the knowledge of those skilled in the art to affect these features, structures, or characteristics in conjunction with other implementations.

[0031] It should be understood that although the terms "first" and "second" etc. can be used in this article to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. As used in this article, the term "and / or" includes any and all combinations of one or more of the listed terms.

[0032] The terms used herein are for the purpose of describing specific implementations only and are not intended to limit example implementations. As used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprises", "includes", "has", "includes", and / or "comprising" when used herein specify the presence of the features, elements, and / or components, etc., but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0033] As used in this application, the term "circuitry" may refer to one or more or all of the following:

[0034] (a) hardware circuit implementation only (such as implementation in analog and / or digital circuitry only), and

[0035] (b) a combination of hardware circuitry and software such as (where applicable):

[0036] (i) a combination of analog and / or digital hardware circuits and software / firmware, and

[0037] (ii) any portion of a hardware processor(s) with software (including digital signal processor(s), software, and memory(s) that work together to enable a device (such as a mobile phone or server) to perform various functions), and

[0038] (c) Hardware circuits and / or processor(s), such as microprocessor(s) or portions of microprocessor(s), that require software (e.g., firmware) to operate, but in which the software may not be present when not required for operation.

[0039] This definition of circuitry applies to all uses of the term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of only a hardware circuit or processor (or multiple processors) or a portion of a hardware circuit or processor and its accompanying software and / or firmware. For example, if applicable to a particular claim element, the term circuitry also covers a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing or network device.

[0040] As used herein, the term "communication network" refers to a network that complies with any suitable communication standard, such as Long Term Evolution (LTE), Advanced LTE (LTE-A), Wideband Code Division Multiple Access (WCDMA), High Speed ​​Packet Access (HSPA), Narrowband Internet of Things (NB-IoT), etc. In addition, in a communication network, the communication between a terminal device and a network device can be performed according to any suitable generation of communication protocols, including but not limited to first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, future fifth generation (5G) communication protocols, and / or any other protocols currently known or to be developed in the future. The implementation of the present disclosure can be applied to various communication systems. In view of the rapid development of communication, there will certainly be future types of communication technologies and systems that can be used to implement the present disclosure. The scope of the present disclosure should not be limited to the above-mentioned systems.

[0041] As used herein, the term "network device" refers to a node in a communication network via which a terminal device accesses the network and receives services from the network. A network device may refer to a base station (BS) or an access point (AP), for example, a NodeB (NodeB or NB), an evolved NodeB (eNodeB or eNB), a NR next generation NodeB (NR NB), a remote radio unit (RRU), a radio head (RH), a remote radio head (RRH), an integrated access and backhaul (IAB) node, a relay, a low power node (such as a femto, pico), etc., depending on the terminology and technology applied. A network device is allowed to be defined as part of a gNB, for example in a CU / DU split, in which case the network device is defined as a gNB-CU or a gNB-DU.

[0042] The term "terminal device" refers to any terminal device capable of wireless communication. As an example and not limitation, the terminal device may also be referred to as a communication device, a user equipment (UE), a subscriber station (SS), a portable subscriber station, a mobile station (MS), or an access terminal (AT). The terminal device may include, but is not limited to, a mobile phone, a cellular phone, a smart phone, a voice over IP (VoIP) phone, a wireless local loop phone, a tablet computer, a wearable terminal device, a personal digital assistant (PDA), a portable computer, a desktop computer, an image capture terminal device (such as a digital camera), a game terminal device, a music storage and playback appliance, a vehicle-mounted wireless terminal device, a wireless endpoint, a mobile station, a laptop embedded device (LEE), a laptop mounted device (LME), a USB dongle, a smart device, a wireless client device (CPE), an Internet of Things (IoT) device, a watch or other wearable device, a head mounted display (HMD), a vehicle, a drone, medical equipment and applications (e.g., remote surgery), industrial equipment and applications (e.g., robots and / or other wireless devices operating in the context of industrial and / or automated processing chains), consumer electronic devices, equipment operating in commercial and / or industrial wireless networks, etc. In the following description, the terms "terminal device", "communication device", "terminal", "user equipment" and "UE" may be used interchangeably.

[0043] Figure 1 1 is a schematic diagram of an example communication network 100 in which implementations of the present disclosure may be implemented. Figure 1 As shown, the communication network 100 may include a first device 110, a second device 120, and a third device 130. The third device 130 may communicate with the first device 110 and the second device 120 via corresponding wireless communication channels.

[0044] In this example, for ease of discussion only, the first device 110 and the second device 120 are shown as vehicles that enable V2X communication, and the third device 130 is shown as a network device serving the vehicles 110 and 120. It should be understood that the vehicle and the network device are merely example implementations of the first device 110, the second device 120, and the third device 130, respectively, and do not imply any limitation on the scope of the present application. Any other suitable implementation is also possible.

[0045] It should be understood that Figure 1 The number of devices (110, 120, 130) in the communication network 100 is given for illustrative purposes and does not imply any limitation on the present disclosure. The communication network 100 may include any suitable number of devices suitable for implementing implementations of the present disclosure.

[0046] The communication in the communication network 100 may conform to any suitable standard, including but not limited to Global System for Mobile Communications (GSM), LTE, Evolved LTE, Advanced LTE (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), GSMEDGE Radio Access Network (GERAN), Machine Type Communication (MTC), etc. In addition, the communication may be performed according to any generation of communication protocols currently known or to be developed in the future. Examples of communication protocols include but are not limited to first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocols.

[0047] In an example, communication between a first device 110 and a second device 120 may be performed in a new radio (NR) operation in an unlicensed band. In some implementations, communication in the communication network 100 may include sidelink (SL) communication (112, 122). In unlicensed bands below 7 GHz, coexistence of new radio (NR) with other systems (e.g., IEEE802.11) may be ensured via a listen-before-talk (LBT) channel access mechanism. Depending on the channel access mechanism, a user equipment (UE) (i.e., device 110 or device 120) that wants to perform a SL transmission (112 or 122) may need to first successfully complete an LBT check before initiating the same SL transmission. Hereinafter, the LBT process may also be referred to as a clear channel assessment (CCA) or a channel access process.

[0048] In order for the UE to pass the LBT check, it should observe that the channel is available for multiple consecutive CCA slots. Figure 2 As shown, in the frequency band below 7 GHz, the duration of these time slots is 9 microseconds. Figure 2 shows that a CCA slot may have a duration T sl = 9 microseconds, where energy sensing occurs during 4 microseconds. If the measured power (i.e., the energy collected during the CCA slot) is below a regulatory threshold (which may depend on the operating band and geographic region), the UE considers the channel to be available in the CCA slot.

[0049] In an example, when a UE (e.g., device 110) acts as an initiating device to initiate communication with a responding device (e.g., device 120), the initiating UE (device 110) may need to obtain the "right" to access the channel for a certain period of time (represented in the rules as the channel occupancy time (COT)) by applying an "extended" LBT procedure, where the channel should be considered idle for the entire contention window (CW) duration. This "extended" LBT procedure is generally referred to as a Type 1 LBT procedure or LBT Type 1 procedure as specified in TS 37.213. The procedure is as follows Figure 3 shown.

[0050] Figure 3 Both the CW duration and the COT duration in may depend on the channel access priority class (CAPC) (e.g., p=1 to p=4) associated with the traffic of the UE, as shown in Table 1. Control plane traffic (such as the physical sidelink control channel (PSCCH)) may be sent with a priority of p=1, while user plane traffic has a priority of p>1. Table 1 depicts the details of Type 1 LBT for the Uu uplink (UL) case. It may be noted that in the downlink (DL) case, the Type 1 LBT parameters may in principle also be adopted in the SL.

[0051] Table 1

[0052]

[0053] Table 1 shows the CAPCs for UL. The contention window length in the CCA slot associated with each CAPC has a minimum (CW min，p ) and maximum (CW max，p ). The duration of COT is determined by T ulmcot，p Given.

[0054] Figure 4 An example of the behavior during the contention window countdown process is depicted. It should be noted that if during the countdown process, the LBT check fails in any CCA slot, the countdown process will stop and will only resume if the channel is considered idle (i.e., the LBT check succeeds) during the delay time.

[0055] exist Figure 4 In, T d Indicates the delay time, T sl represents the CCA slot duration, and N represents the number of CCA slots that need to be considered idle before the contention window countdown is completed. Specifically, Figure 4 An example of the Type 1 LBT contention window countdown process and how it can be interrupted is shown. In example (a), the delay time T d and countdown are not interrupted (i.e., the channel is not detected as busy during the sensing time slot). In example (b), the delay time T d is interrupted (ie, during the delayed time sensing slot, the channel is detected as busy). In example (c), the contention window countdown is interrupted (ie, during the counted down sensing slot, the channel is detected as busy).

[0056] A UE initiating a transmission (also referred to as an initiating device, e.g., device 110) may obtain a COT having a duration associated with a priority p in a corresponding CAPC after successfully completing a Type 1 LBT procedure and performing a transmission (e.g., to device 120). The obtained COT may be valid even in the case where the initiating device (e.g., device 110) may suspend its transmission (e.g., to device 120), although a "reduced" LBT procedure may still need to be performed if the initiating device wants to perform a new transmission (e.g., to device 120) (within the COT). This "reduced" LBT procedure is generally referred to as a Type 2 LBT procedure or an LBT Type 2 procedure, which has the following variations:

[0057] Type 2A (25 microseconds LBT)—used for SL transmissions within the COT acquired by the initiating device (if the gap between two SL transmissions is ≥ 25 microseconds, and for SL transmissions that follow another SL transmission), such as Figure 5A Example (c) and Figure 5B As shown in example (f) in ;

[0058] Type 2B (16 microseconds LBT)—used for SL transmissions within the COT acquired by the initiating device (can only be used for SL transmissions that follow another SL with a gap exactly equal to 16 microseconds), such as Figure 5A Example (b) and Figure 5B As shown in example (e) in;

[0059] Type 2C (no LBT) - can only be used for SL transmissions after another SL with a gap < 16 microseconds and the duration of the allowed SL transmissions ≤ 584 microseconds, such as Figure 5A Example (a) and Figure 5B As shown in example (d) in .

[0060] In addition, examples (a), (b) and (c) show the case where the gap is between two transmissions both from the same initiating UE (i.e., device 110), and correspondingly, examples (d), (e) and (f) show the case where the gap is between two different transmissions from the initiating UE (e.g., device 110) and the responding UE (e.g., device 120).

[0061] An initiating device (e.g., device 110) may share its acquired COT with its intended receiver, also referred to as a responding device (e.g., device 120). For this purpose, the initiating device (e.g., device 110) shall inform (e.g., via control signaling) the responding device (e.g., device 120) about the duration of the COT. The responding device then uses this information to decide which type of LBT procedure should be applied when performing a transmission for which the intended receiver is the initiating device. If the responding device transmission exceeds the COT, the responding device (e.g., device 120) shall acquire a new COT using Type 1 LBT with an appropriate category p in the CAPC. This will refer to Figure 6 to describe.

[0062] Figure 6 An example is shown in which an initiator device according to implementation uses different types of LBT processes to communicate with multiple responding devices under respectively acquired COTs through a side link (SL). Figure 6 , the initiating device (UE A) may first use a type 1 LBT procedure 610 to acquire a new COT 605. The initiating device (UE A) may then transmit to the first responding device (UE B) via a sidelink (SL) transmission 615 on the PSCCH and / or physical sidelink shared channel (PSSCH). In addition, UE A may share its acquired COT 605 with UE B. UE B may then use the acquired COT 605 information to decide which type of LBT procedure should be applied when performing a transmission to UE A as the intended receiver. In practice, UE A may notify (e.g., via control signaling) UE B about the duration of the COT 605 within the SL transmission 615. In response, UE B may be configured to perform a type 2 LBT procedure 620 and send SL feedback information 625 to UE A on the PSFCH.

[0063] Alternatively, UE B may communicate with another responding device (e.g., UE C). If the transmission from UE B to UE C exceeds the duration of COT 605, UE B may need to acquire a new COT 630 using a type 1 LBT procedure 635 according to the appropriate category p in the CAPC. UE B may then send a SL transmission 640 to UE C on the PSCCH and / or PSSCH and share its acquired COT 630 with UE C. UE C may use the COT 630 information to decide which type of LBT procedure UE C should apply when performing a transmission to UE B as an intended receiver. In practice, UE B may inform (e.g., via control signaling) UE C about the duration of the COT 630 within the SL transmission 640. In response, UE C may be configured to perform a type 2 LBT procedure 645 and send SL feedback information 650 to UE B on the PSFCH.

[0064] If UE A wants to perform a transmission to UE C, UE A may need to use a type 1 LBT procedure 660 with an appropriate CAPC to obtain another new COT 655. For example, UE A may need to use a type 1 LBT procedure 660 with an appropriate category p in the CAPC to obtain a new COT 655. UE A can send a SL transmission 665 to UE C on the PSCCH and / or PSSCH. In addition, UE A can also share the duration in the obtained COT 655 with UE C (e.g., via control signaling). UE C can then use this duration information of the COT 655 to decide which type of LBT procedure UE C should apply when performing a transmission to UE A as the intended receiver. After receiving the SL transmission 665 with the duration information of the COT 655, UE C can successfully perform a type 2 LBT procedure 670 and send SL feedback information 675 to UE A on the PSFCH.

[0065] In an embodiment, the sidelink ranging or positioning in the unlicensed band may be performed by different devices UE A and UE B (or device 110 and device 120). For example, timing estimation based on round trip time (RTT) may be considered as a suitable method for sidelink ranging or positioning, because the first device 110 and the second device 120 (i.e., the responding devices) are usually not well synchronized. Back Figure 1 In order to perform ranging or positioning between the first device 110 and the second device 120 by adopting RTT, the first device 110 can send a first sidelink positioning reference signal sequence 112 (PRS_t) to the second device 120, and then receive a second sidelink PRS sequence 122 (PRS_s) from the second device 120 to estimate the RTT.

[0066] The accuracy of the RTT-based timing estimate may depend on the bandwidth of the PRS transmission. Sub-meter positioning accuracy may require at least 100 MHz. Authorized bands (such as ITS bands) cannot provide such a large bandwidth. However, unlicensed bands can provide such a large bandwidth. Therefore, for ranging or positioning, the first device 110 and the second device 120 can send corresponding first sidelink PRS sequences 112 (PRS_t) and second sidelink PRS sequences 122 (PRS_s) in the unlicensed band.

[0067] In an unlicensed band, the first device 110 and the second device 120 may need to quickly access the channel to complete the transmission of the first sidelink PRS sequence 112 (PRS_t) and the second sidelink PRS sequence 122 (PRS_s) for fast ranging or positioning.

[0068] The implementation of the present disclosure (see Figure 7 ) can provide a solution for sidelink ranging or positioning to solve the above problem and one or more other potential problems. According to the solution, the first device (UE A) can perform a first type LBT process. In response to the successful execution of the first type LBT process, the first device (UE A) can send a first sidelink PRS sequence (PRS_t) for ranging or positioning between the first device (UE A) and the second device (UE B) to the second device (UE B) in an unlicensed band. The first sidelink PRS sequence (PRS_t) is not only used for ranging or positioning related estimates (such as timing estimates), but also conveys information about the first type LBT process applied by the first device in the unlicensed band to acquire a channel, and about the second type LBT process that the second device (UE B) should apply later to acquire the channel (see Table 2). After receiving the first sidelink PRS sequence (PRS_t), the second device (UE B) can determine the second type LBT process based on the first sidelink PRS sequence (PRS_t). In this way, the latency of PRS sequence transmission (PRS_t and PRS_s) in the unlicensed band can be reduced, and fast ranging or positioning can be achieved.

[0069] In the following, reference will be made to Figures 7 to 13 To describe the principles of the present disclosure.

[0070] Figure 7 FIG. 7 is a signaling diagram of a process 700 for sidelink ranging or positioning according to some example embodiments of the present disclosure. For discussion purposes, the process 700 will refer to Figure 1 Process 700 may involve Figure 1The first device 110 and the second device 120 are shown. Although the process 700 will be Figure 1 The process is described in the communication network 100, but the process can also be applied to other communication scenarios.

[0071] For example, the third type LBT process may be a type 1 LBT process as described above, and the first type LBT process may be a 25 microsecond LBT process, which will be described below with reference to Table 2. In this example, after determining that the type 1 LBT process cannot be successfully completed before the transmission of the first sidelink PRS sequence, the first device 110 may switch to the 25 microsecond LBT process. Therefore, the latency of the transmission of the first sidelink PRS sequence may be reduced.

[0072] It should be understood that each of the first type LBT process and the third type LBT process may be any type of LBT process as long as the third type LBT process is different from the first type LBT process.

[0073] As shown, the first device 110 may perform (step 730) a first type LBT procedure in an unlicensed band.

[0074] The first device 110 may determine (step 740) whether the first type LBT process (step 730) is successfully performed. If the first type LBT process is successfully performed (step 730), the first device 110 may send (step 750) a first sidelink PRS sequence (PRS_t) to the second device 120 in an unlicensed band. The first sidelink PRS sequence (PRS_t) may be used for ranging or positioning between the first device 110 and the second device 120. The first sidelink PRS sequence (PRS_t) may be associated with the first type LBT process and a second type LBT process to be performed by the second device 120, the second type LBT process being used to send (step 795) a second sidelink PRS sequence (PRS_s) to the first device 110 in an unlicensed band for ranging or positioning.

[0075] Alternatively, the first sidelink PRS sequence (PRS_t) may be associated with a first type LBT process or a second type LBT process to be performed by the second device 120, the second type LBT process being used to send a second sidelink PRS sequence (PRS_s) to the first device 110 in an unlicensed band.

[0076] In some implementations, the second sidelink PRS sequence (PRS_s) can be used for ranging or positioning between the first device 110 and the second device 120 .

[0077] Therefore, the second device 120 detects (step 760) the first sidelink PRS sequence (PRS_t) sent by the first device 110 (step 750). The second device 120 can determine (step 770) the first type of LBT process for transmission of the first sidelink PRS sequence performed by the first device 110 based on the first sidelink PRS sequence (PRS_t).

[0078] The second device 120 determines (step 780) a second type of LBT process to be performed based on the first type of LBT process. In turn, the second device 120 performs (step 790) a second type of LBT process for transmitting (step 795) a second sidelink PRS sequence (PRS_s) to the first device in an unlicensed band for ranging or positioning. If the second type of LBT process is successful, the second device 120 sends (step 795) a second sidelink PRS sequence (PRS_s) to the first device 110. Otherwise, the second device 120 may not send any sidelink PRS sequence.

[0079] Using process 700, the latency of PRS sequence transmission (steps 750, 795) in an unlicensed band can be reduced and fast ranging or positioning can be achieved.

[0080] Continue to refer Figure 7 In some implementations, before performing (step 730) the first type LBT procedure, the first device 110 may perform (step 710) a third type LBT procedure in the unlicensed band. The third type LBT procedure may be different from the first type LBT procedure. Furthermore, the first device 110 may determine (step 720) whether the third type LBT procedure can be successfully completed before the transmission (step 750) of the first sidelink PRS sequence (PRS_t).

[0081] In some implementations, the first device 110 determines whether the third type LBT process can be successfully completed before the transmission of the first sidelink PRS sequence (PRS_t) (step 750) based on the value of the backoff counter.

[0082] Consider an example. In this example, the initial value of the backoff counter (V = V i ) is set to seven. The first device 110 may perform the third type LBT process once every 9 microseconds. If the first device 110 determines that the channel is idle by performing the third type LBT process, the value of the backoff counter will be reduced by one (V=V i-1). If the value of the backoff counter decreases to zero (V=0) and the channel is idle, the first device 110 may transmit (step 750) the first sidelink PRS sequence (PRS_t). However, if there are 30 microseconds before the transmission of the first sidelink PRS sequence and the current value of the backoff counter (V) is equal to 4, the first device 110 may determine that the third type LBT process may not be successfully completed before the transmission of the first sidelink PRS sequence (PRS_t) (step 750).

[0083] If the third type LBT process cannot be successfully completed before the transmission of the first sidelink PRS sequence (PRS_t) (step 750), the first device 110 performs (step 730) the first type LBT process. For example, the third type LBT process can be the type 1 LBT process as described above, and the first type LBT process can be the 25 microsecond LBT process described below with reference to Table 2. In this example, when it is determined that the type 1 LBT process cannot be successfully completed before the transmission of the first sidelink PRS sequence, the first device 110 switches to the 25 microsecond LBT process. Therefore, the latency of the transmission of the first sidelink PRS sequence can be reduced.

[0084] It should be understood that each of the first type LBT process and the third type LBT process may be any type of LBT process as long as the third type LBT process is different from the first type LBT process.

[0085] Table 2 shows an example of a first mapping between a first sidelink PRS sequence, a first type LBT process, and a second type LBT process.

[0086] Table 2

[0087]

[0088] Table 2 shows a mapping table that associates the first type LBT process and the second type LBT process to a plurality of available PRS sequences (eg, PRS_t(sqn1) to PRS_t(sqn4)) provided in the first sidelink PRS sequence (PRS_t). The mapping information in Table 2 can be obtained by Figure 1 , Figure 7 and Figures 9 to 11The embodiments or examples shown in are practiced. As shown in Table 2, for example, if the first device 110 successfully performs a type 1 LBT process (also known as an extended LBT process), the first device 110 sends a sidelink PRS sequence #1 (PRS_t(sqn1)) provided in the first sidelink PRS sequence (PRS_t) to the second device 120. Since the first device 110 can acquire a channel by successfully performing a type 1 LBT process, the first device 110 can share the COT with the second device 120 by sending (i.e., PSCCH / PSSCH) shared information about the COT to the second device 120. For example, the shared information about the COT may indicate the identity of the device (e.g., device 120 or UE B) that is allowed to use the shared COT, the duration of the COT, etc.

[0089] Accordingly, if sequence #1 (PRS_t(sqn1)) is detected by the second device 120, the second device 120 may determine that a type 1 LBT process (also referred to as an extended LBT process) is performed by the first device 110 for transmitting sequence #1. In addition, the second device 120 may determine that a type 2C LBT process is to be performed by the second device 120 for transmitting a second sidelink PRS sequence (PRS_s) to the first device 110. In other words, the second device 120 does not need to perform an LBT process again. This may result in the second sidelink PRS sequence (PRS_s) being transmitted immediately after the first sidelink PRS sequence (PRS_t) is transmitted.

[0090] In addition, based on determining that the Type 1 LBT process is performed by the first device 110, the second device 120 can determine that the shared information about the COT can be used. In other words, the second device 120 can determine that the COT is actually shared by the first device 110. In turn, the second device 120 can perform a Type 2C LBT process based on the shared information about the COT. For example, the second device 120 can perform a Type 2C LBT process for the duration of the COT.

[0091] For another example, if the first device 110 successfully performs a 25 microsecond LBT process (i.e., a first type LBT process), the first device 110 may send a sidelink PRS sequence #2 (i.e., PRS_t(sqn2)) to the second device 120. In the example, when the first device 110 acquires the channel by successfully performing a 25 microsecond LBT process, similar to the transmission of an NR-U discovery reference signal (DRS), the first device 110 may use short control signaling transmission to send the sequence #2 (PRS_t(sqn2)). As shown in this example, the first device 110 cannot share the COT with the second device 120. In addition, the following restrictions are imposed on the use of short control signaling transmission:

[0092] The number of short control signaling transmissions by one or more devices during a 50 ms observation period should be equal to or less than 50; and

[0093] • During the observation period, the total duration of short control signaling transmissions should be less than 2500 microseconds.

[0094] In the case where sequence #2 (PRS_t(sqn2)) is detected by the second device 120, the second device 120 may determine that a 25 microsecond LBT process is performed by the first device 110 for transmitting sequence #2 (PRS_t(sqn2)). In addition, the second device 120 may determine that a 25 microsecond LBT process (i.e., a second type LBT process) may also be performed by the second device 120 for transmitting a second sidelink PRS sequence (PRS_s).

[0095] In another example, the first device 110 (the responding device) may employ a method provided by one or more other devices ( Figure 1 In this example, the first device 110 may perform a Type 2A LBT procedure. If the Type 2A LBT procedure is successful, the first device 110 sends a sidelink PRS sequence #4 (i.e., (PRS_t(sqn4)) in the first PRS sequence) to the second device 120.

[0096] Accordingly, if sequence #4 (PRS_t(sqn4)) can be detected by the second device 120, the second device 120 can determine that the type 2A LBT process (i.e., the first type LBT process) is performed by the first device 110 for transmitting sequence #4 (PRS_t(sqn4)) in the first sidelink PRS sequence. In addition, the second device 120 can determine that the type 2A LBT process (i.e., the second type LBT process) will be performed by the second device 120 for transmitting the second sidelink PRS sequence (PRS_s).

[0097] Alternatively, the first mapping may be between a first sidelink PRS sequence (PRS_t), a first type LBT process, and a set of second type LBT processes. For example, the first sidelink PRS sequence (PRS_t) may be associated with a set of second type LBT processes. The second device 120 may determine the second type LBT process from the set of second type LBT processes.

[0098] Table 1 only provides an example of a first mapping between a first sidelink PRS sequence (PRS_t(sqn1) to PRS_t(sqn4)), a first type of LBT process, and a second type of LBT process, without implying any limitation on the scope of the present disclosure. The PRS sequence may be mapped to any suitable type of LBT process.

[0099] In some implementations, each of the first device 110 and the second device 120 can receive information about a first mapping between a first sidelink PRS sequence (PRS_t), a first type LBT process, and a second type LBT process from the network device 130.

[0100] Alternatively, in some implementations, a first mapping between a first sidelink PRS sequence (PRS_t), a first type LBT process, and a second type LBT process may be predefined.

[0101] Alternatively, in some implementations, the first device 110 may configure the second device 120 with information regarding a first mapping between a first sidelink PRS sequence (PRS_t), a first type LBT process, and a second type LBT process.

[0102] In some implementations, such as Figure 7 As shown, before sending a first sidelink PRS sequence (PRS_t) to the second device 120, the first device 110 may send (step 705) to the second device 120 information about at least one of the following items: a first resource reservation for transmission of the first sidelink PRS sequence (PRS_t), a second resource reservation for transmission of the second sidelink PRS sequence (PRS_s), or a first mapping between the first sidelink PRS sequence, the first type LBT process, and the second type LBT process.

[0103] For example, the information about the first resource reservation may include at least one of the following items: a starting symbol for transmission of a first sidelink PRS sequence (PRS_t) (e.g., symbol s1 in time slot t1), or a duration of transmission of the first sidelink PRS sequence (PRS_t). The information about the second resource reservation may include at least one of the following items: a starting transmission symbol (e.g., symbol s2 in time slot t1), or a transmission duration of a second sidelink PRS sequence.

[0104] In such an implementation, the second device 120 may detect the first sidelink PRS sequence based on the information about the first resource reservation. In addition, the second device 120 may send the second sidelink PRS sequence based on the information about the second resource reservation.

[0105] In some implementations, before sending the first sidelink PRS sequence (PRS_t), the first device 110 can send information about at least one of the first resource reservation and the second resource reservation or the first mapping in the licensed band.

[0106] In some implementations, the first device 110 may send information about at least one of the first resource reservation and the second resource reservation or the first mapping in sidelink control information (SCI) carried in a PSCCH or a PSSCH. Alternatively, the first device 110 may send information about at least one of the first resource reservation and the second resource reservation or the first mapping in a media access control (MAC) control element (CE) carried in a PSSCH.

[0107] In some implementations, the first sidelink PRS sequence may be associated with a frame structure (e.g., any of 810, 820, 830) for transmission of the first sidelink PRS sequence (PRS_t), and the frame structure may be associated with the second type LBT process. In such an implementation, the second device 120 may determine the frame structure based on the first sidelink PRS sequence (PRS_t). In addition, the second device 120 may determine the second type LBT process to be performed based on the first type LBT process and the frame structure. This will refer to Tables 3 and FIG. 8A to FIG. 8C to describe.

[0108] Table 3 shows an example of a second mapping between a first sidelink PRS sequence (PRS_t), a first type LBT process, a frame structure, and a second type LBT process.

[0109] Table 3

[0110]

[0111] Fig. 8A An example of a frame structure 810 for transmission of a first sidelink PRS sequence (PRS_t) is shown, where a Type 1 LBT procedure is successfully performed at the first device 110. In this example, the first device 110 may transmit a first sidelink PRS sequence including SL PRS sequence #1 (PRS_t(sqn1)) 812, and the second device 120 transmits a second sidelink PRS sequence 814 (e.g., PRS_s).

[0112] As shown, symbol #1 of time slot t1 is the starting symbol for transmission of the first PRS sequence #1 (PRS_t(sqn1)) 812. The transmission duration of the first PRS sequence #1 (PRS_t(sqn1)) 812 may last for a plurality of symbols. Symbol #1 may be used for automatic gain control (AGC). Alternatively, a portion of symbol #1 (i.e., AGC(PRS_t)) may be used for AGC.

[0113] In symbol #2 of time slot t1, the first device 110 transmits a first PRS sequence #1 (PRS_t(sqn1)) 812, which is used for sequence detection and timing estimation at the second device 120.

[0114] Symbol #3 of time slot t1 is used to occupy the channel, which leaves more time for the second device 120 to complete sequence detection and then perform corresponding operations. Symbol #2 and symbol #3 can be cached by the second device 120 and combined together for ranging or positioning related estimation (such as timing estimation) to improve estimation performance.

[0115] The first part of symbol #4 of time slot t1 is used to occupy the channel, thereby providing a gap of less than 16 microseconds between the transmission of the first PRS sequence #1 (PRS_t(sqn1)) 812 and the transmission of the second PRS sequence (PRS_s) 814. This prevents third parties from accessing the channel and ensures that the second PRS sequence (PRS_s) 814 is sent in sequence. The transmission of the second PRS sequence (PRS_s) 814 from the second device 120 occupies symbols #5 and #6 of time slot t1.

[0116] The signal sent from the first device in the first part of symbol #4 may be a repetition of the same part of symbol #3. Alternatively, the signal sent from the first device in the first part of symbol #4 may be constructed based on the first PRS sequence #1 (PRS_t(sqn1)). Alternatively, the signal sent from the first device in the first part of symbol #4 may be any signal.

[0117] If the first PRS sequence #1 (PRS_t(sqn1)) 812 is detected by the second device 120, the second device 120 may determine that the Type 1 LBT process has been performed by the first device 110 for transmission of the first PRS sequence #1 (PRS_t(sqn1)) 812. In addition, the second device 120 may determine that the frame structure 810 is used for transmission of the first PRS sequence #1 (PRS_t(sqn1)) 812. Based on the frame structure 810, the second device 120 may determine that the gap between the transmission of the first PRS sequence #1 (PRS_t(sqn1)) 812 and the transmission of the second PRS sequence (PRS_s) 814 is less than 16 microseconds. Furthermore, the second device 120 may determine that the Type 2C LBT process will be performed by the second device 120 for transmission of the second PRS sequence (PRS_s) 814 to the first device 110 before symbol #5.

[0118] Figure 8B An example of a frame structure 820 for transmission of a first sidelink PRS sequence is shown, wherein a 25 microsecond LBT process is successfully performed at the first device 110. In this example, the first device 110 transmits a first sidelink PRS sequence #2 (PRS_t(sqn2)) 822, and the second device 120 transmits a second sidelink PRS sequence (PRS_s) 824.

[0119] As shown, if the first PRS sequence #2 (PRS_t(sqn2)) 822 is detected by the second device 120, the second device 120 may determine that a 25 microsecond LBT process has been performed by the first device 110 for transmission of the first PRS sequence #2 (PRS_t(sqn2)) 822. In addition, the second device 120 may determine that the frame structure 820 is used for transmission of the first PRS sequence #2 (PRS_t(sqn2)) 822. Based on the frame structure 820, the second device 120 may determine that the gap between the transmission of the first PRS sequence #2 (PRS_t(sqn2)) 822 and the transmission of the second PRS sequence 824 is greater than 25 microseconds. Furthermore, the second device 120 may determine that a 25 microsecond LBT process will be performed by the second device 120 before symbol #5 for transmission of the second PRS sequence 824 to the first device 110.

[0120] The signal sent from the first device 110 in the first part of symbol #4 may be a repetition of the same part of symbol #3. Alternatively, the signal sent from the first device 110 in the first part of symbol #4 may be constructed based on the first PRS sequence. Alternatively, the signal sent from the first device in the first part of symbol #4 may be any signal.

[0121] Figure 8CAn example of a frame structure 830 for transmission of a first sidelink PRS sequence is shown, where a 25 microsecond LBT process is successfully performed at the first device 110. In this example, the first device 110 transmits a first sidelink PRS sequence #3 (PRS_t(sqn3)) 832, and the second device 120 transmits a second sidelink PRS sequence (PRS_s) 834.

[0122] As shown, if the first PRS sequence #3 (PRS_t(sqn3)) 832 is detected by the second device 120, the second device 120 may determine that the 25 microsecond LBT process has been performed by the first device 110 for the transmission of the first PRS sequence #3 (PRS_t(sqn3)) 832. In addition, the second device 120 may determine that the frame structure 830 is used for the transmission of the first PRS sequence #3 (PRS_t(sqn3)) 832. Based on the frame structure 830, the second device 120 may determine that the gap between the transmission of the first PRS sequence #3 (PRS_t(sqn3)) 832 and the transmission of the second PRS sequence (PRS_s) 834 includes two symbols. Since more gap time is intentionally left for the second device 120, the second device 120 may determine that the type 1 LBT process will be performed by the second device 120 before symbol #5 for the transmission of the second PRS sequence 834 to the first device 110.

[0123] It should be understood that the first PRS sequences 812, 822, and 832 may be different from each other, and the second PRS sequences (PRS_s) 814, 824, and 834 may be different from or the same as each other.

[0124] Fig. 9 900 according to some implementations of the present disclosure. In some implementations, the method 900 can be performed on a device (such as Figure 1 For the purpose of discussion, reference will be made to Figure 1 900 performed by the first device 110 without loss of generality.

[0125] At block 910 , the first device 110 may perform a first type LBT procedure in an unlicensed band.

[0126] At block 920, in response to successful execution of the first type LBT procedure, the first device 110 may send a first sidelink PRS sequence (PRS_t) to the second device 120 in the unlicensed band for ranging between the first device 110 and the second device 120, and / or for positioning of the first device 110. The first sidelink PRS sequence (PRS_t) may be associated with the first type LBT procedure and / or a second type LBT procedure to be performed by the second device 120, the second type LBT procedure being used to send a second sidelink PRS sequence (PRS_s) to the first device 110 in the unlicensed band for ranging or positioning.

[0127] In some implementations, the first device 110 can communicate the remaining sidelink signals or channels with the second device 120 in a licensed frequency band for ranging or positioning.

[0128] In some implementations, the first device 110 can apply a first sidelink PRS sequence based on a first type LBT process.

[0129] In some implementations, the second type LBT process can be applied by the second device 120 based on the first type LBT process.

[0130] In some implementations, the first sidelink PRS sequence may indicate a first type LBT process and a second type LBT process.

[0131] In some implementations, performing the first type LBT process may include: performing the first type LBT process when it is determined that the third type LBT process cannot be successfully completed before the transmission of the first sidelink PRS sequence (PRS_t). The third type LBT process is different from the first type LBT process.

[0132] In some implementations, each of the first type LBT process and the second type LBT process is a 25 microsecond LBT process, and the third type LBT process is a type 1 LBT process.

[0133] In some implementations, the first type LBT process is a 25 microsecond LBT process, and each of the second type LBT process and the third type LBT process is a type 1 LBT process.

[0134] In some implementations, each of the first type LBT process and the second type LBT process is a type 2A LBT process.

[0135] In some implementations, the first type LBT process is a type 1 LBT process, and the second type LBT process is a type 2C LBT process.

[0136] In some implementations, the method 900 further includes receiving, from the third device 130, information regarding a first mapping between a first sidelink PRS sequence (PRS_t), a first type LBT process, and a second type LBT process.

[0137] In some implementations, the first device 110 is an initiating device, the second device 120 is a responding device, and the third device 130 is one of a network node and a core network node for ranging or positioning.

[0138] In some implementations, a first mapping between a first sidelink PRS sequence (PRS_t), a first type of LBT process, and a second type of LBT process is predefined.

[0139] In some implementations, the first sidelink PRS sequence (PRS_t) is associated with a frame structure for transmission of the first sidelink PRS sequence (PRS_t), and the frame structure is associated with a second type LBT process.

[0140] In some implementations, the method 900 further includes, before sending the first sidelink PRS sequence (PRS_t) to the second device 120, sending information about at least one of the following items to the second device 120: a first resource reservation for transmission of the first sidelink PRS sequence (PRS_t), a second resource reservation for transmission of the second sidelink PRS sequence (PRS_s), and a first mapping between the first sidelink PRS sequence (PRS_t), the first type LBT process, and the second type LBT process.

[0141] In some implementations, sending information about at least one of the first resource reservation and the second resource reservation includes sending the information in one of: an SCI carried in a PSCCH or a PSSCH, or a MAC CE carried in a PSSCH.

[0142] In some implementations, the first resource reservation indicates at least one of: a starting symbol for transmission of a first sidelink PRS sequence (PRS_t), or a duration of transmission of the first sidelink PRS sequence (PRS_t).

[0143] In some implementations, the second resource reservation indicates at least one of: a starting symbol for transmission of a second sidelink PRS sequence (PRS_s), or a duration of transmission of the second sidelink PRS sequence (PRS_s).

[0144] In some implementations, the method 900 further includes sending the shared information about the COT to the second device 120 .

[0145] In some implementations, information about at least one of the first resource reservation and the second resource reservation is sent to the second device 120 in a licensed frequency band.

[0146] Fig.10 1 shows a flow chart of an example method 1000 according to some implementations of the present disclosure. Example method 1000 can be considered as an example implementation of method 900. In some implementations, method 1000 can be performed on a device (such as Figure 1 For the purpose of discussion, reference will be made to Figure 1 1000 performed by the first device 110, without loss of generality.

[0147] At block 1010, the first device 110 transmits sidelink control information (SCI) in a licensed band. The SCI may include configuration information about at least one of the following: a first resource reservation for transmission of a first sidelink PRS sequence (PRS_t), or a second resource reservation for transmission of a second sidelink PRS sequence (PRS_s). In addition, the SCI may also include information about a first mapping between the first sidelink PRS sequence (PRS_t), the first type LBT process, and the second type LBT process.

[0148] At block 1015 , the first device 110 may perform a Type 1 LBT procedure in an unlicensed band.

[0149] At block 1020 , the first device 110 determines whether a Type 1 LBT procedure can be successfully completed prior to transmission of the sidelink PRS sequence # 1 (ie, the first PRS sequence # 1 (PRS_t(sqn1)) 812 ).

[0150] If the Type 1 LBT process can be successfully completed before the transmission of the sidelink PRS sequence #1 (ie, the first PRS sequence #1 (PRS_t(sqn1)) 812 ), the first device 110 continues the Type 1 LBT process at block 1025 .

[0151] At block 1030, the first device 110 determines whether the Type 1 LBT process is successful. If the Type 1 LBT process is successful, the first device 110 transmits a sidelink PRS sequence #1 (i.e., a first PRS sequence #1 (PRS_t(sqn1)) 812) to the second device 120 in the unlicensed band at block 1035. On the other hand, if the Type 1 LBT process is unsuccessful, the first device 110 does not transmit any sidelink PRS sequence at block 1040.

[0152] At box 1020, if the first device 110 determines that the type 1 LBT process cannot be successfully completed before the transmission of the sidelink PRS sequence #1 (i.e., the first PRS sequence #1 (PRS_t(sqn1)) 812), the first device 110 performs a 25 microsecond LBT process in the unlicensed band at box 1045.

[0153] At block 1050, the first device 110 determines whether the 25 microsecond LBT process is successful. If the 25 microsecond LBT process is successful, the first device 110 transmits a sidelink PRS sequence #2 (i.e., first PRS sequence #2 (PRS_t(sqn2)) 822) to the second device 120 in the unlicensed band at block 1055. On the other hand, if the 25 microsecond LBT process is not successful, the first device 110 does not transmit any sidelink PRS sequence at block 1040.

[0154] Fig.11 1 shows a flow chart of an example method 1100 according to some implementations of the present disclosure. In some implementations, the method 1100 can be performed on a device (such as Figure 1 For the purpose of discussion, reference will be made to Figure 1 1100 performed by the second device 120 without loss of generality.

[0155] At block 1110 , the second device 120 detects a first sidelink PRS sequence (PRS_t) transmitted by the first device 110 in an unlicensed band for ranging between the first device 110 and the second device 120 and / or for positioning of the first device 110 .

[0156] At box 1120, the second device 120 determines a first type of LBT process performed by the first device 110 for transmission of the first sidelink PRS sequence (PRS_t) in the unlicensed band based on the first sidelink PRS sequence (PRS_t).

[0157] At box 1130, the second device 120 determines a second type LBT process based on the first type LBT process.

[0158] At block 1140 , the second device 120 performs a second type LBT procedure for transmitting a second sidelink PRS sequence (PRS_s) to the first device 110 in an unlicensed band for ranging or positioning.

[0159] In some implementations, the second device 120 can communicate the remaining sidelink signals or channels with the first device 110 in the licensed frequency band for ranging or positioning.

[0160] In some implementations, the second device 120 can apply a second sidelink PRS sequence based on a second type LBT process.

[0161] In some implementations, the second device 120 can apply the second type LBT process based on the first type LBT process.

[0162] In some implementations, the method 1100 further includes receiving, from the first device 110 or the third device 130, information about a first mapping between a first sidelink PRS sequence (PRS_t), a first type LBT process, and a second type LBT process.

[0163] In some implementations, the first device 110 is an initiating device, the second device 120 is a responding device, and the third device 130 is one of a network node and a core network node for ranging or positioning.

[0164] In some implementations, receiving information about the first mapping includes receiving information in one of: an SCI carried in a PSCCH or a PSSCH in a licensed band, or a MAC CE carried in a PSSCH in a licensed band.

[0165] In some implementations, a first mapping between a first sidelink PRS sequence (PRS_t), a first type of LBT process, and a second type of LBT process is predefined.

[0166] In some implementations, the first type LBT process is a type 1 LBT process, and the second type LBT process is a type 2C LBT process.

[0167] In some implementations, each of the first type LBT process and the second type LBT process is a type 2A LBT process.

[0168] In some implementations, a first sidelink PRS sequence (PRS_t) is associated with a frame structure for transmission of the first sidelink PRS sequence (PRS_t), and the frame structure is associated with a second type of LBT procedure. In such an implementation, determining the frame structure includes: determining the frame structure based on the first sidelink PRS sequence (PRS_t). In such an implementation, determining the second type of LBT procedure to be performed includes: determining the second type of LBT procedure to be performed based on the first type of LBT procedure and the frame structure.

[0169] In some implementations, the method 1100 further includes receiving information about a first resource reservation for transmission of a first sidelink PRS sequence (PRS_t) from the first device 110. In such an implementation, detecting the first sidelink PRS sequence (PRS_t) includes detecting the first sidelink PRS sequence (PRS_t) based on the information.

[0170] In some implementations, the first resource reservation indicates at least one of: a starting symbol for transmission of a first sidelink PRS sequence (PRS_t), or a duration of transmission of the first sidelink PRS sequence (PRS_t).

[0171] In some implementations, receiving the information about the first resource reservation includes receiving the information about the first resource reservation in one of the following items: an SCI carried in a PSCCH or a PSSCH in a licensed band, or a MAC CE carried in a PSSCH in a licensed band.

[0172] In some implementations, the method 1100 further includes receiving information about a second resource reservation for transmission of a second sidelink PRS sequence (PRS_s) from the first device 110. In such an implementation, sending the second sidelink PRS sequence (PRS_s) includes sending the second sidelink PRS sequence (PRS_s) based on the information.

[0173] In some implementations, the second resource reservation indicates at least one of: a starting symbol for transmission of a second sidelink PRS sequence (PRS_s), or a duration of transmission of the second sidelink PRS sequence (PRS_s).

[0174] In some implementations, receiving the information about the second resource reservation includes receiving the information about the second resource reservation in one of: an SCI carried in a PSCCH or a PSSCH in a licensed band, or a MAC CE carried in a PSSCH in a licensed band.

[0175] In some implementations, the method 1100 further includes: receiving shared information about the COT from the first device 110; and performing a second type of LBT process based on the shared information.

[0176] It should be understood that reference has been made to Figure 1 The implementation of the present disclosure described up to Figure 8 is also applicable to methods 900, 1000, and 1100. For simplicity, the details of the implementation are omitted.

[0177] In some example implementations, an apparatus capable of performing any of the methods 900 (e.g., the first device 110) may include a component for performing the corresponding steps of the method 900. The component may be implemented in any suitable form. For example, the component may be implemented as a circuit or a software module.

[0178] In some example implementations, the apparatus includes: means for performing, by the first device 110, a first type of LBT procedure in an unlicensed band; and means for sending, to the second device 120 in the unlicensed band, in response to successful performance of the first type of LBT procedure, a first sidelink PRS sequence (PRS_t) for ranging between the first device 110 and the second device 120, and / or for positioning of the first device 110. In some implementations, the first sidelink PRS sequence is associated with the first type of LBT procedure and / or a second type of LBT procedure to be performed by the second device 120, the second type of LBT procedure being used to send a second sidelink PRS sequence (PRS_s) to the first device 110 in the unlicensed band for ranging or positioning.

[0179] In some implementations, the apparatus further includes means for communicating the remaining sidelink signals or channels with the second device 120 in the licensed frequency band for ranging or positioning.

[0180] In some implementations, means for transmitting a first sidelink PRS sequence (PRS_t) includes means for applying the first sidelink PRS sequence based on a first type LBT process.

[0181] In some implementations, the second type LBT process can be applied by the second device 120 based on the first type LBT process.

[0182] In some implementations, the first sidelink PRS sequence may indicate a first type LBT process and a second type LBT process.

[0183] In some implementations, the means for performing the first type of LBT process may include: means for performing the first type of LBT process when it is determined that the third type of LBT process cannot be successfully completed before the transmission of the first sidelink PRS sequence (PRS_t). The third type of LBT process is different from the first type of LBT process.

[0184] In some implementations, each of the first type LBT process and the second type LBT process is a 25 microsecond LBT process, and the third type LBT process is a type 1 LBT process.

[0185] In some implementations, the first type LBT process is a 25 microsecond LBT process, and each of the second type LBT process and the third type LBT process is a type 1 LBT process.

[0186] In some implementations, each of the first type LBT process and the second type LBT process is a type 2A LBT process.

[0187] In some implementations, the first type LBT process is a type 1 LBT process, and the second type LBT process is a type 2C LBT process.

[0188] In some implementations, the apparatus further includes means for receiving information from a third device 130 regarding a first mapping between a first sidelink PRS sequence (PRS_t), a first type of LBT process, and a second type of LBT process.

[0189] In some implementations, the first device 110 is an initiating device, the second device 120 is a responding device, and the third device 130 is one of a network node and a core network node for ranging or positioning.

[0190] In some implementations, a first mapping between a first sidelink PRS sequence (PRS_t), a first type of LBT process, and a second type of LBT process is predefined.

[0191] In some implementations, the first sidelink PRS sequence (PRS_t) is associated with a frame structure for transmission of the first sidelink PRS sequence (PRS_t), and the frame structure is associated with a second type LBT process.

[0192] In some implementations, the apparatus further includes, before sending the first sidelink PRS sequence (PRS_t) to the second device 120, a component for sending information about at least one of the following items to the second device 120: a first resource reservation for transmission of the first sidelink PRS sequence (PRS_t), a second resource reservation for transmission of the second sidelink PRS sequence (PRS_s), and a first mapping between the first sidelink PRS sequence (PRS_t), the first type LBT process, and the second type LBT process.

[0193] In some implementations, means for sending information about at least one of the first resource reservation and the second resource reservation includes means for sending the information in one of: an SCI carried in a PSCCH or a PSSCH, or a MAC CE carried in a PSSCH.

[0194] In some implementations, the first resource reservation indicates at least one of: a starting symbol for transmission of a first sidelink PRS sequence (PRS_t), or a duration of transmission of the first sidelink PRS sequence (PRS_t).

[0195] In some implementations, the second resource reservation indicates at least one of: a starting symbol for transmission of a second sidelink PRS sequence (PRS_s), or a duration of transmission of the second sidelink PRS sequence (PRS_s).

[0196] In some implementations, the apparatus further includes: a component for sending the shared information about the COT to the second device 120 .

[0197] In some implementations, information about at least one of the first resource reservation and the second resource reservation is sent to the second device 120 in a licensed frequency band.

[0198] In some example implementations, an apparatus capable of performing any of the methods 1100 (e.g., the second device 120) may include a component for performing the corresponding steps of the method 1100. The component may be implemented in any suitable form. For example, the component may be implemented in a circuit system or a software module.

[0199] In some example implementations, the apparatus includes: a component for detecting, by the second device 120, a first sidelink PRS sequence (PRS_t) sent by the first device 110 in an unlicensed band for ranging between the first device 110 and the second device 120 and / or for positioning of the first device 110; a component for determining, based on the first sidelink PRS sequence, a first type of LBT process performed by the first device 110 for transmission of the first sidelink PRS sequence; a component for determining a second type of LBT process based on the first type of LBT process; and a component for performing a second type of LBT process for transmitting a second sidelink PRS sequence (PRS_s) to the first device 110 in the unlicensed band for ranging or positioning.

[0200] In some implementations, the apparatus further includes means for communicating the remaining sidelink signals or channels with the first device 110 in the licensed frequency band for ranging or positioning.

[0201] In some implementations, the apparatus further includes means for applying a second sidelink PRS sequence based on a second type LBT process.

[0202] In some implementations, the means for performing the second type LBT process includes: means for applying the second type LBT process based on the first type LBT process.

[0203] In some implementations, the apparatus further includes a component for receiving information about a first mapping between a first sidelink PRS sequence (PRS_t), a first type LBT process, and a second type LBT process from the first device 110 or the third device 130.

[0204] In some implementations, the first device 110 is an initiating device, the second device 120 is a responding device, and the third device 130 is one of a network node and a core network node for ranging or positioning.

[0205] In some implementations, the means for receiving information about the first mapping includes means for receiving information of one of: an SCI carried in a PSCCH or a PSSCH in a licensed band, or a MAC CE carried in a PSSCH in a licensed band.

[0206] In some implementations, a first mapping between a first sidelink PRS sequence (PRS_t), a first type of LBT process, and a second type of LBT process is predefined.

[0207] In some implementations, the first type LBT process is a type 1 LBT process and the second type LBT process is a type 2C LBT process.

[0208] In some implementations, each of the first type LBT process and the second type LBT process is a type 2A LBT process.

[0209] In some implementations, a first sidelink PRS sequence (PRS_t) is associated with a frame structure for transmission of the first sidelink PRS sequence (PRS_t), and the frame structure is associated with a second type of LBT procedure. In such an implementation, a component for determining the frame structure includes: a component for determining the frame structure based on the first sidelink PRS sequence (PRS_t). In such an implementation, a component for determining a second type of LBT procedure to be performed includes: a component for determining a second type of LBT procedure to be performed based on the first type of LBT procedure and the frame structure.

[0210] In some implementations, the apparatus further includes means for receiving information about a first resource reservation for transmission of a first sidelink PRS sequence (PRS_t) from the first device 110. In such an implementation, means for detecting the first sidelink PRS sequence (PRS_t) includes means for detecting the first sidelink PRS sequence (PRS_t) based on the information.

[0211] In some implementations, the first resource reservation indicates at least one of: a starting symbol for transmission of a first sidelink PRS sequence (PRS_t), or a duration of transmission of the first sidelink PRS sequence (PRS_t).

[0212] In some implementations, the means for receiving information about the first resource reservation includes means for receiving information about the first resource reservation in one of the following items: an SCI carried in a PSCCH or PSSCH in a licensed band, or a MAC CE carried in a PSSCH in a licensed band.

[0213] In some implementations, the apparatus further includes means for receiving information about a second resource reservation for transmission of a second sidelink PRS sequence (PRS_s) from the first device 110. In such an implementation, means for sending the second sidelink PRS sequence (PRS_s) includes means for sending the second sidelink PRS sequence (PRS_s) based on the information.

[0214] In some implementations, the second resource reservation indicates at least one of: a starting symbol for transmission of a second sidelink PRS sequence (PRS_s), or a duration of transmission of the second sidelink PRS sequence (PRS_s).

[0215] In some implementations, the means for receiving information about the second resource reservation includes: means for receiving information about the second resource reservation in one of the following items: SCI carried in PSCCH or PSSCH in the authorized band, or MAC CE carried in PSSCH in the authorized band.

[0216] In some implementations, the apparatus further includes: a component for receiving shared information about the COT from the first device 110; and the component for performing the second type LBT process includes: a component for performing the second type LBT process based on the shared information.

[0217] Fig.12 1 is a simplified block diagram of a device 1200 suitable for implementing an embodiment of the present disclosure. The device 1200 may be provided to implement a communication device, such as Figure 1 The first device 110 or the second device 120 is shown. As shown, the device 1200 includes one or more processors 1210, one or more memories 1220 coupled to the processor 1210, and one or more communication modules 1240 coupled to the processor 1210.

[0218] The communication module 1240 is used for two-way communication. The communication module 1240 has at least one antenna to facilitate communication. The communication interface may represent any interface necessary for communication with other network elements.

[0219] Processor 1210 may be of any type suitable for the local technology network, and may include, as non-limiting examples, one or more of the following: a general purpose computer, a special purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. Device 1200 may have multiple processors, such as application specific integrated circuit chips, which are time-slaved to a clock synchronized with a main processor.

[0220] The memory 1220 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memories include, but are not limited to, read-only memory (ROM) 1224, electrically programmable read-only memory (EPROM), flash memory, hard disk, compact disk (CD), digital video disk (DVD), and other magnetic storage devices and / or optical storage devices. Examples of volatile memories include, but are not limited to, random access memory (RAM) 1222, and other volatile memories that do not persist during power outages.

[0221] Computer program 1230 includes computer executable instructions executed by associated processor 1210. Program 1230 may be stored in ROM 1224. Processor 1210 may perform any suitable actions and processes by loading program 1230 into RAM 1222.

[0222] The embodiments of the present disclosure may be implemented by the program 1230 so that the device 1200 may execute the Figures 1 to 11 Any process of the present disclosure discussed. The embodiments of the present disclosure may also be implemented by hardware, or by a combination of software and hardware.

[0223] In some embodiments, the program 1230 may be tangibly embodied in a computer-readable medium that may be included in the device 1200 (such as in the memory 1220) or in other storage devices accessible by the device 1200. The device 1200 may load the program 1230 from the computer-readable medium to the RAM 1222 for execution. The computer-readable medium may include any type of tangible non-volatile memory, such as ROM, EPROM, flash memory, hard disk, CD, DVD, etc. Fig.13 An example of a computer readable medium 1300 in the form of a CD or DVD is shown. The computer readable medium has a program 1230 stored thereon.

[0224] Generally, the various embodiments of the present disclosure may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor, or other computing device. Although various aspects of the embodiments of the present disclosure are illustrated and described as block diagrams, flow charts, or using some other graphical representations, it should be understood that, as non-limiting examples, the boxes, devices, systems, techniques, or methods described herein may be implemented in hardware, software, firmware, dedicated circuits or logic, general hardware or controllers or other computing devices, or some combination thereof.

[0225] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer executable instructions, such as instructions included in a program module, which are executed in a device on a target physical or virtual processor to perform the above referenced Fig. 9 , Fig.10 and Fig.11 Methods 900, 1000 and 1100 described herein. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform specific tasks or implement specific abstract data types. In various embodiments, the functions of program modules can be combined or split between program modules as needed. Machine executable instructions for program modules can be executed in local or distributed devices. In distributed devices, program modules can be located in both local and remote storage media.

[0226] The program code for executing the disclosed method can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer or other programmable data processing device so that the program code, when executed by the processor or controller, enables the function / operation specified in the flow chart and / or block diagram to be realized. The program code can be executed completely on the machine, partially on the machine, as an independent software package, partially on the machine and partially on a remote machine, or completely on a remote machine or server.

[0227] In the context of the present disclosure, computer program codes or related data may be carried by any suitable carrier to enable a device, apparatus or processor to perform various processes and operations as described above. Examples of carriers include signals, computer readable media, etc.

[0228] The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. More specific examples of computer readable storage media will include: an electrical connection with one or more wires, a portable computer floppy disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0229] In addition, although the operations are described in a specific order, this should not be understood as requiring such operations to be performed in the specific order shown or in order, or performing all the operations shown, to obtain the desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be interpreted as limitations on the scope of the present disclosure, but rather descriptions of features that may be specific to a particular embodiment. Certain features described in the context of a separate embodiment may also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0230] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it should be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Instead, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A first device, comprising: at least one processor; as well as at least one memory including computer program code; wherein the at least one memory and the computer program code are configured to, together with the at least one processor, cause the first device to: performing a first type listen-before-talk (LBT) procedure in an unlicensed band; as well as In response to successful execution of the first type LBT process, a first sidelink positioning reference signal (PRS) sequence for ranging between the first device and the second device, and / or for positioning of the first device is sent to a second device in the unlicensed frequency band, wherein the first sidelink PRS sequence is associated with the first type LBT process and / or a second type LBT process to be performed by the second device, and the second type LBT process is used to send a second sidelink PRS sequence to the first device in the unlicensed frequency band for the ranging or the positioning.

2. The first device according to claim 1, wherein the first device is configured to: The remaining sidelink signal or channel is transmitted with the second device in a licensed frequency band for the ranging or the positioning.

3. The first device according to claim 1, wherein the first device is configured to: Based on the first type LBT process, the first sidelink PRS sequence is applied.

4. The first device of claim 1, wherein the second type LBT process is applied by the second device based on the first type LBT process.

5. The first device of claim 1, wherein the first sidelink PRS sequence indicates the first type LBT process and the second type LBT process.

6. A first device according to claim 1, wherein the first device is configured to: perform the first type LBT process when it is determined that a third type LBT process in the unlicensed frequency band cannot be successfully completed before the transmission of the first sidelink PRS sequence, and the third type LBT process is different from the first type LBT process.

7. The first device of claim 6, wherein each of the first type LBT process and the second type LBT process is a 25 microsecond LBT process, and the third type LBT process is a type 1 LBT process.

8. The first device of claim 6, wherein the first type LBT process is a 25 microsecond LBT process, and each of the second type LBT process and the third type LBT process is a type 1 LBT process.

9. The first device of claim 1, wherein each of the first type LBT process and the second type LBT process is a type 2A LBT process.

10. The first device of claim 1, wherein the first type LBT process is a type 1 LBT process, and the second type LBT process is a type 2C LBT process.

11. The first device according to claim 1, wherein the first device is further caused to: Information about a first mapping between the first sidelink PRS sequence, the first type LBT process, and the second type LBT process is received from a third device. 12 . The first device according to claim 11 , wherein the first device is an initiating device, the second device is a responding device, and the third device is one of a network node and a core network node for the ranging or the positioning.

13. The first device of claim 1, wherein a first mapping between the first sidelink PRS sequence, the first type LBT process, and the second type LBT process is predefined.

14. The first device of claim 1, wherein the first sidelink PRS sequence is associated with a frame structure for the transmission of the first sidelink PRS sequence, and the frame structure is associated with the second type LBT process.

15. The first device of claim 1 , wherein before sending the first sidelink PRS sequence to the second device, the first device is further caused to: Sending information about at least one of the following items to the second device: a first resource reservation for said transmission of said first sidelink PRS sequence, or a second resource reservation for said transmission of said second sidelink PRS sequence, and A first mapping between the first sidelink PRS sequence, the first type LBT process and the second type LBT process.

16. The first device of claim 15, wherein the first device is caused to send the information in one of the following: Sidelink Control Information (SCI) carried in the Physical Sidelink Control Channel (PSCCH) or the Physical Sidelink Shared Channel (PSSCH), or A Medium Access Control Element (MAC CE) is carried in the PSSCH.

17. The first device of claim 15, wherein the first resource reservation indicates at least one of the following: a starting symbol for said transmission of said first sidelink PRS sequence, or The duration of the transmission of the first sidelink PRS sequence.

18. The first device of claim 15, wherein the second resource reservation indicates at least one of the following: a starting symbol for said transmission of said second sidelink PRS sequence, or The duration of the transmission of the second sidelink PRS sequence.

19. The first device of claim 1, wherein the first device is further caused to: The shared information about the channel occupancy time (COT) is sent to the second device.

20. The first device of claim 15, wherein the information is sent to the second device in a licensed frequency band.

21. A second device, comprising: at least one processor; as well as at least one memory including computer program code; wherein the at least one memory and the computer program code are configured to, together with the at least one processor, cause the second device to: detecting a first sidelink positioning reference signal (PRS) sequence transmitted by a first device in an unlicensed frequency band for ranging between the first device and the second device and / or for positioning of the first device; determining, based on the first sidelink PRS sequence, a first type of listen-before-talk (LBT) procedure performed by the first device for the transmission of the first sidelink PRS sequence in the unlicensed band; Based on the first type of LBT process, determining a second type of LBT process; as well as The second type LBT process is performed to transmit a second sidelink PRS sequence to the first device in the unlicensed band for the ranging or the positioning.

22. The second device according to claim 21, wherein the second device is caused to: The remaining sidelink signals or channels are communicated with the first device in a licensed frequency band for the ranging or the positioning.

23. The second device according to claim 21, wherein the second device is caused to: Based on the second type LBT process, the second sidelink PRS sequence is applied.

24. The second device according to claim 21, wherein the second device is caused to: Based on the first type LBT process, the second type LBT process is applied.

25. The second device of claim 21, wherein the second device is further caused to: Information about a first mapping between the first sidelink PRS sequence, the first type LBT process, and the second type LBT process is received from the first device or the third device. 26 . The second device of claim 25 , wherein the first device is an initiating device, the second device is a responding device, and the third device is one of a network node and a core network node for the ranging or the positioning.

27. The second device of claim 25, wherein the second device is caused to receive the information about the first mapping in one of the following: Sidelink Control Information (SCI) carried in the Physical Sidelink Control Channel (PSCCH) or the Physical Sidelink Shared Channel (PSSCH) in the licensed band, or A Medium Access Control Element (MAC CE) is carried in the PSSCH in the licensed band.

28. The second device of claim 21, wherein a first mapping between the first sidelink PRS sequence, the first type LBT process, and the second type LBT process is predefined.

29. The second device of claim 21, wherein the first type LBT process is a type 1 LBT process, and the second type LBT process is a type 2C LBT process.

30. The second device of claim 21, wherein each of the first type LBT process and the second type LBT process is a type 2A LBT process.

31. The second device of claim 21 , wherein the first sidelink PRS sequence is associated with a frame structure used for transmission of the first sidelink PRS sequence, and the frame structure is associated with the second type LBT procedure; The second device is further configured to: determine the frame structure based on the first sidelink PRS sequence; and The second device is configured to determine the second type LBT process to be performed based on the first type LBT process and the frame structure.

32. The second device of claim 21, wherein the second device is further caused to: receiving, from the first device, information regarding a first resource reservation for the transmission of the first sidelink PRS sequence; and The second device is caused to: detect the first sidelink PRS sequence based on the information.

33. The second device of claim 32, wherein the first resource reservation indicates at least one of the following: a starting symbol for said transmission of said first sidelink PRS sequence, or The duration of the transmission of the first sidelink PRS sequence.

34. The second device of claim 32, wherein the second device is caused to receive the information about the first resource reservation in one of the following: Sidelink Control Information (SCI) carried in the Physical Sidelink Control Channel (PSCCH) or the Physical Sidelink Shared Channel (PSSCH) in the licensed band, or A Medium Access Control Element (MAC CE) is carried in the PSSCH in the licensed band.

35. The second device of claim 21, wherein the second device is further caused to: receiving, from the first device, information regarding a second resource reservation for the transmission of the second sidelink PRS sequence; and The second device is caused to: send the second sidelink PRS sequence based on the information.

36. The second device of claim 35, wherein the second resource reservation indicates at least one of the following: a starting symbol for said transmission of said second sidelink PRS sequence, or The duration of the transmission of the second sidelink PRS sequence.

37. The second device of claim 35, wherein the second device is caused to receive the information about the second resource reservation in one of the following: Sidelink Control Information (SCI) carried in the Physical Sidelink Control Channel (PSCCH) or the Physical Sidelink Shared Channel (PSSCH) in the licensed band, or A Medium Access Control Element (MAC CE) is carried in the PSSCH in the licensed band.

38. The second device of claim 21, wherein the second device is further caused to: receiving shared information about channel occupancy time (COT) from the first device, and Based on the shared information, the second type LBT process is performed.

39. A method comprising: performing, by the first device, a first type of listen-before-talk (LBT) procedure in an unlicensed band; as well as In response to successful execution of the first type LBT process, a first sidelink positioning reference signal (PRS) sequence for ranging between the first device and the second device, and / or for positioning of the first device is sent to a second device in the unlicensed frequency band, wherein the first sidelink PRS sequence is associated with the first type LBT process and / or a second type LBT process to be performed by the second device, and the second type LBT process is used to send a second sidelink PRS sequence to the first device in the unlicensed frequency band for the ranging or the positioning.

40. A method comprising: detecting, by the second device, a first sidelink positioning reference signal (PRS) sequence transmitted by the first device in an unlicensed frequency band for ranging between the first device and the second device and / or for positioning of the first device; determining, based on the first sidelink PRS sequence, a first type of listen-before-talk (LBT) procedure to be performed by the first device for the transmission of the first sidelink PRS sequence; Based on the first type of LBT process, determining a second type of LBT process; as well as The second type LBT process is performed to transmit a second sidelink PRS sequence to the first device in the unlicensed band for the ranging or the positioning.

41. An apparatus comprising: means for performing, by a first device, a first type of listen-before-talk (LBT) procedure in an unlicensed frequency band; as well as A component for sending a first sidelink positioning reference signal (PRS) sequence for ranging between the first device and the second device, and / or for positioning the first device to a second device in the unlicensed frequency band in response to successful execution of the first type LBT process, wherein the first sidelink PRS sequence is associated with the first type LBT process and / or a second type LBT process to be performed by the second device, and the second type LBT process is used to send a second sidelink PRS sequence to the first device in the unlicensed frequency band for the ranging or the positioning.

42. An apparatus comprising: means for detecting, by a second device, a first sidelink positioning reference signal (PRS) sequence transmitted by a first device in an unlicensed frequency band for ranging between the first device and the second device and / or for positioning of the first device; means for determining, based on the first sidelink PRS sequence, a first type of listen-before-talk (LBT) procedure to be performed by the first device for the transmission of the first sidelink PRS sequence; A component for determining a second type of LBT process based on the first type of LBT process; as well as Means for performing the second type LBT procedure for transmitting a second sidelink PRS sequence to the first device in the unlicensed band for the ranging or the positioning.

43. A computer readable medium comprising program instructions for causing an apparatus to at least perform the method according to claim 39.

44. A computer readable medium comprising program instructions for causing an apparatus to at least perform the method according to claim 40.

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