WO2022198389A1

WO2022198389A1 - Sidelink configuration method and apparatus, communication device, and storage medium

Info

Publication number: WO2022198389A1
Application number: PCT/CN2021/082111
Authority: WO
Inventors: 郭胜祥
Original assignee: 北京小米移动软件有限公司
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2022-09-29
Also published as: CN113170292B; CN113170292A

Abstract

Embodiments of the present disclosure provide a sidelink (SL) configuration method and apparatus, a communication device, and a storage medium. The method is executed by a terminal, and comprises: reporting a network switching time supported by the terminal, wherein the network switching time is the time when the terminal performs network switching between the SL and new radio (NR); and receiving a guard period of the SL configured on the basis of the network switching time.

Description

Sidelink configuration method and device, communication device and storage medium

technical field

The embodiments of the present disclosure relate to the field of wireless communication, but are not limited to the field of wireless communication, and in particular, relate to a sidelink configuration method and apparatus, a communication device, and a storage medium.

Background technique

Vehicle to Everything (V2X) is a new generation of information and communication technology that connects vehicles with everything. V2X can provide two communication interfaces, which are called Uu interface (cellular communication interface) and PC5 interface (direct communication interface).

Based on the fact that the operator's spectrum demand is increasing day by day, but the actual spectrum that can be allocated and used is gradually decreasing, for the operator's existing licensed frequency band, the simultaneous transmission of NR licensed spectrum service and NR V2X service on the licensed spectrum is one of the current operators. big demand. For the terminal, direct communication is implemented through a side link (Sidelink, SL). However, on the basis that the terminal can use the two services at the same time, there is no mature method to realize the switching of the two services and to ensure less interference in the device.

SUMMARY OF THE INVENTION

The present disclosure provides an SL (SideLink, sidelink) configuration method and device, a communication device, and a storage medium.

According to a first aspect of the embodiments of the present disclosure, a method for configuring an SL is provided, wherein the method is executed by a terminal, including:

reporting the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches networks between the SL and the NR (New Radio, new air interface);

A guard interval of the SL configured based on the network switching time is received.

In some embodiments, the guard interval is used for the terminal to perform network handover between the SL and the NR within the period of the guard interval of the SL.

In some embodiments, the guard interval of the SL is the number of symbols left blank at the end of the SL slot.

In some embodiments, the duration of the guard interval is an integer multiple of the duration of a single symbol.

In some embodiments, the method further includes:

receiving indication information that instructs the terminal to report the network switching time;

The reporting of the network switching time supported by the terminal includes:

According to the indication information, the network switching time is reported.

According to a second aspect of the embodiments of the present disclosure, a method for configuring an SL is provided. The method is executed by a network device, including:

receiving the network switching time supported by the terminal, wherein the network switching time is the time for the terminal to switch networks between the SL and the NR;

The guard interval of the SL configured based on the network switching time is sent.

In some embodiments, the guard interval is provided for the terminal to perform network handover between the SL and the NR within a period of the guard interval of the SL.

In some embodiments, the method further includes:

The guard interval of the SL is configured according to the network switching time, the timing advance value of the terminal, and the SCS (Subcarrier Spacing, subcarrier spacing) value of the SL carrier.

In some embodiments, the duration of the guard interval is greater than or equal to the sum of the network switching time, the timing advance value, and the duration required for the terminal power change.

In some embodiments, the duration required for the terminal power to change includes:

The sum of the duration that the power of the terminal in SL is converted from the on state to the off state and the power of the terminal in NR is converted from the off state to the on state; or

The sum of the duration that the power of the terminal in the NR is switched from the ON state to the OFF state and the duration that the power of the terminal in the SL is switched from the OFF state to the ON state.

In some embodiments, the method further includes:

According to the SCS value, the duration of a single symbol is determined; wherein, the duration of the guard interval is an integer multiple of the duration of the single symbol.

In some embodiments, the method further includes:

sending indication information that instructs the terminal to report the network switching time;

The network switching time supported by the receiving terminal includes:

The network switching time reported by the terminal based on the indication information is received.

According to a third aspect of the embodiments of the present disclosure, an apparatus for configuring an SL is provided, where the apparatus is applied to a terminal, including:

a reporting module, configured to report the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches networks between the SL and the NR;

The first receiving module is configured to receive the guard interval of the SL configured based on the network switching time.

In some embodiments, the apparatus further includes:

a second receiving module, configured to receive indication information that instructs the terminal to report the network switching time;

The reporting module includes:

The reporting submodule is configured to report the network switching time according to the indication information.

According to a fourth aspect of the embodiments of the present disclosure, an apparatus for configuring an SL is provided. The apparatus is applied to a network device, including:

a third receiving module, configured to receive the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches the network between the SL and the NR;

A first sending module, configured to send the guard interval of the SL configured based on the network switching time.

In some embodiments, the apparatus further includes:

A processing module configured to configure the guard interval of the SL according to the network switching time, the timing advance value of the terminal and the SCS value of the SL carrier.

The sum of the duration that the power of the terminal in the SL is switched from the on state to the off state and the duration of the power of the terminal in the NR that is switched from the off state to the on state; or

In some embodiments, the apparatus further includes:

The determining module is configured to determine the duration of a single symbol according to the SCS value; wherein, the duration of the guard interval is an integer multiple of the duration of the single symbol.

In some embodiments, the apparatus further includes:

a second sending module, configured to send indication information that instructs the terminal to report the network switching time;

The third receiving module includes:

The receiving submodule is configured to receive the network switching time reported by the terminal based on the indication information.

According to a fifth aspect of the embodiments of the present disclosure, there is provided a communication device, the communication device including at least: a processor and a memory for storing executable instructions that can be executed on the processor, wherein:

When the processor is used to run the executable instructions, the executable instructions execute the steps in any one of the above-mentioned SL configuration methods.

According to a sixth aspect of the embodiments of the present disclosure, a non-transitory computer-readable storage medium is provided, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, any of the above-mentioned Steps in an SL configuration method.

Embodiments of the present disclosure provide an SL configuration method and apparatus, a communication device, and a storage medium. Through the technical solutions of the embodiments of the present disclosure, the terminal reports the network switching time according to its own capabilities, and receives the SL guard interval configured based on the network switching time. In this way, when the terminal performs network handover between SL and NR, it can use the period of the guard interval of SL to perform handover, thereby improving handover efficiency, saving the time occupied by handover time and NR time slot, and improving spectrum utilization efficiency.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the embodiments of the invention.

FIG. 1 is a schematic structural diagram of a wireless communication system according to an exemplary embodiment;

FIG. 2 is a flowchart 1 of a method for configuring an SL according to an exemplary embodiment;

3 is a schematic structural diagram of an SL communication system according to an exemplary embodiment;

FIG. 4 is a second flowchart of a method for configuring an SL according to an exemplary embodiment;

FIG. 5 is a third flowchart of a method for configuring an SL according to an exemplary embodiment;

6 is a schematic diagram of the time axis of the SL service and the NR service shown according to an exemplary embodiment;

FIG. 7 is a fourth flowchart of a method for configuring an SL according to an exemplary embodiment;

FIG. 8 is a schematic diagram showing the principle of switching from SL to NR according to an exemplary embodiment;

FIG. 9 is a structural block diagram 1 of an apparatus for configuring an SL according to an exemplary embodiment;

FIG. 10 is a second structural block diagram of an apparatus for configuring an SL according to an exemplary embodiment;

FIG. 11 is a schematic structural diagram 1 of a communication device according to an exemplary embodiment;

FIG. 12 is a second schematic structural diagram of a communication device according to an exemplary embodiment.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments are not intended to represent all implementations consistent with embodiments of the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of embodiments of the present disclosure, as recited in the appended claims.

The terms used in the embodiments of the present disclosure are only for the purpose of describing particular embodiments, and are not intended to limit the embodiments of the present disclosure. As used in the embodiments of the present disclosure and the appended claims, the singular forms "a" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used in embodiments of the present disclosure to describe various pieces of information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the embodiments of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

To better describe any embodiment of the present disclosure, an embodiment of the present disclosure takes an application scenario of access control as an example for illustrative description.

Please refer to FIG. 1 , which shows a schematic structural diagram of a wireless communication system provided by an embodiment of the present disclosure. As shown in FIG. 1 , the wireless communication system is a communication system based on cellular mobile communication technology, and the wireless communication system may include: several terminals 11 and several base stations 12 .

The terminal 11 may be a device that provides voice and/or data connectivity to the user. The terminal 11 may communicate with one or more core networks via a radio access network (RAN), and the terminal 11 may be an IoT terminal such as a sensor device, a mobile phone (or "cellular" phone) and a The computer of the IoT terminal, for example, may be a fixed, portable, pocket, hand-held, built-in computer or a vehicle-mounted device. For example, a station (Station, STA), a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a mobile station (mobile), a remote station (remote station), an access point, a remote terminal ( remote terminal), access terminal, user terminal, user agent, user device, or user equipment (terminal). Alternatively, the terminal 11 may also be a device of an unmanned aerial vehicle. Alternatively, the terminal 11 may also be a vehicle-mounted device, for example, a trip computer with a wireless communication function, or a wireless terminal connected to an external trip computer. Alternatively, the terminal 11 may also be a roadside device, for example, a street light, a signal light, or other roadside devices with a wireless communication function.

The base station 12 may be a network-side device in a wireless communication system. Wherein, the wireless communication system may be a fourth generation mobile communication (the 4th generation mobile communication, 4G) system, also known as a long term evolution (Long Term Evolution, LTE) system; or, the wireless communication system may also be a 5G system, Also known as new radio (NR) system or 5G NR system. Alternatively, the wireless communication system may also be a next-generation system of the 5G system. Among them, the access network in the 5G system may be called NG-RAN (New Generation-Radio Access Network, a new generation of radio access network).

The base station 12 may be an evolved base station (eNB) used in the 4G system. Alternatively, the base station 12 may also be a base station (gNB) that adopts a centralized distributed architecture in a 5G system. When the base station 12 adopts a centralized distributed architecture, it usually includes a centralized unit (central unit, CU) and at least two distributed units (distributed unit, DU). The centralized unit is provided with a protocol stack of a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control Protocol (Radio Link Control, RLC) layer, and a Media Access Control (Media Access Control, MAC) layer; distribution A physical (Physical, PHY) layer protocol stack is set in the unit, and the specific implementation manner of the base station 12 is not limited in this embodiment of the present disclosure.

A wireless connection can be established between the base station 12 and the terminal 11 through a wireless air interface. In different embodiments, the wireless air interface is a wireless air interface based on the fourth generation mobile communication network technology (4G) standard; or, the wireless air interface is a wireless air interface based on the fifth generation mobile communication network technology (5G) standard, such as The wireless air interface is a new air interface; alternatively, the wireless air interface may also be a wireless air interface based on a 5G next-generation mobile communication network technology standard.

In some embodiments, an E2E (End to End, end-to-end) connection may also be established between the terminals 11 . For example, V2V (vehicle to vehicle, vehicle-to-vehicle) communication, V2I (vehicle to Infrastructure, vehicle-to-roadside equipment) communication and V2P (vehicle to pedestrian, vehicle-to-person) communication in vehicle-to-everything (V2X) communication etc. scene.

In some embodiments, the above wireless communication system may further include a network management device 13 .

Several base stations 12 are respectively connected to the network management device 13 . Wherein, the network management device 13 may be a core network device in a wireless communication system, for example, the network management device 13 may be a mobility management entity (Mobility Management Entity) in an evolved packet core network (Evolved Packet Core, EPC). MME). Alternatively, the network management device may also be other core network devices, such as a serving gateway (Serving GateWay, SGW), a public data network gateway (Public Data Network GateWay, PGW), a policy and charging rules functional unit (Policy and Charging Rules) Function, PCRF) or home subscriber server (Home Subscriber Server, HSS), etc. The implementation form of the network management device 13 is not limited in this embodiment of the present disclosure.

Based on the fact that the operator's spectrum demand is increasing day by day, but the actual spectrum that can be allocated and used is gradually decreasing, for the operator's existing licensed frequency band, the simultaneous transmission of NR licensed spectrum service and NR V2X service on the licensed spectrum is one of the current operators. big demand. For terminals, it will be a very common scenario to switch between NR licensed spectrum services and NR Sidelink services on the same frequency band. At present, there is no mature method how to effectively realize the handover of the two services in the terminal and ensure less interference in the device.

Therefore, based on the above scenario of service switching, as shown in FIG. 2 , an embodiment of the present disclosure provides a method for configuring an SL. The method is executed by a terminal, including:

Step S101, reporting the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches the network between the SL and the NR;

Step S102: Receive the guard interval of the SL configured based on the network switching time.

In the embodiments of the present disclosure, in order to support the direct communication between the UE and the UE, a sidelink or a sidelink (sidelink, SL) communication mode is introduced. As shown in FIG. 3 , multiple terminals 11 are directly connected through SL. According to the correspondence between sending and receiving UEs, three transmission modes are supported on SL, unicast, multicast and broadcast. Different UEs can communicate directly through the SL without going through the base station.

In the embodiment of the present disclosure, the terminal may be a UE that supports the above-mentioned direct connection communication, and at the same time, the terminal also supports network communication in the NR service, that is, communication through a network device such as a 5G base station.

The terminal can use the same or different licensed spectrum during the communication in the SL and the communication in the NR. If the terminal needs to perform network handover, a certain handover time is required to switch the communication link.

For direct communication, there is a guard interval (Guard Period, GP) between each SL time slot, and network devices such as base stations can configure the SL guard interval for the terminal. Based on the SL frame structure, the last symbol of the SL time slot will be left blank as the above guard interval.

In this embodiment of the present disclosure, the above-mentioned network handover can be performed by using the above-mentioned guard interval of the SL time slot. That is to say, in the time period in which the guard interval of the SL time slot is located, switching between SL and NR is performed, so as to make full use of time-frequency resources, improve spectrum utilization, and improve switching rate.

Based on the capabilities of the terminal, the time required for network switching may be different. Therefore, in the embodiment of the present disclosure, the terminal may report the network switching time required by the terminal to perform network switching to the network device. After receiving the network switching time reported by the terminal, the network device may configure the guard interval of the SL based on the network switching time. Exemplarily, the duration of the guard interval may cover the duration of network switching performed by the terminal, so a guard interval greater than or equal to the above-mentioned network switching time may be configured.

It should be noted that when the terminal performs network handover, the required time may not only include the network handover time, but also may be affected by the power change of the network signal and the timing advance between uplink and downlink. Therefore, the above guard interval The duration of the NR can be longer than the network switching time, so that the entire network switching process can be performed within the above guard interval as much as possible, thereby reducing the time occupied on the NR time slot.

The terminal reports the network switching time according to its own capability, and receives the SL guard interval configured based on the network switching time. In this way, when the terminal performs network handover between SL and NR, it can use the period of the guard interval of SL to perform handover, thereby improving handover efficiency, saving the time occupied by handover time and NR time slot, and improving spectrum utilization efficiency.

In the embodiment of the present disclosure, the symbol corresponding to the guard interval is left blank, so no data transmission is performed in the guard interval in the SL time slot. Therefore, the terminal can perform the above-mentioned network switching within the period of the guard interval. In this way, the network handover will not occupy the time corresponding to the NR time slot, thereby improving handover efficiency and spectrum utilization.

In some embodiments, the guard interval is the number of symbols left blank at the end of the SL slot.

In this embodiment of the present disclosure, the guard interval of the SL may be in units of symbols corresponding to the SL time slot, and may be configured as one or more symbols according to the network switching time of the terminal. The duration corresponding to the one or more symbol numbers can cover the network switching time, thereby facilitating the terminal to perform network switching within the time period in which the guard interval is located.

It should be noted that, the duration of a single symbol in the above-mentioned SL time slot may be determined by the SCS value of the SL carrier of the terminal. Therefore, the duration of the guard interval may be greater than or equal to the network switching time, and may be an integer multiple of the duration of a single symbol determined based on the SCS value. That is to say, for the SL carrier of the terminal, the duration of each single symbol is a fixed value, and the network device may configure several symbols as the guard interval based on the network switching time of the terminal. Therefore, the duration of the guard interval is an integer multiple of the duration of a single symbol.

As shown in FIG. 4 , the SL configuration method provided by the embodiment of the present disclosure includes:

Step S201: Receive indication information that instructs the terminal to report the network switching time;

Step S202, reporting the network switching time according to the indication information.

In this embodiment of the present disclosure, the terminal may report its own network switching time based on the indication of the network device. Therefore, when the terminal receives the indication information instructing it to report the network switching time, it can report the network switching time based on the indication information, thereby facilitating the network device to configure the corresponding SL guard interval.

As shown in FIG. 5 , an embodiment of the present disclosure provides a method for configuring an SL. The method is executed by a network device, including:

Step S301, receiving the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches the network between the SL and the NR;

Step S302: Send the guard interval of the SL configured based on the network switching time.

In this embodiment of the present disclosure, the network device may be a base station or other device capable of providing a network service for a terminal. The above-mentioned terminal may be a UE that supports the above-mentioned direct connection communication. At the same time, the terminal also supports network communication in the NR service, that is, communication through network equipment such as a 5G base station.

The network device is used to configure SL-related parameters for the terminal, including time-frequency information occupied by the SL, and information such as the frame structure of the SL.

In the embodiment of the present disclosure, in order to make the terminal use the guard interval in the SL time slot as much as possible when performing network switching, the network device may configure the corresponding guard interval according to the network switching time reported by the terminal.

In this way, when the terminal performs network handover between SL and NR, it can use the period of the guard interval of SL to perform handover, thereby improving handover efficiency, saving the time occupied by handover time on NR time slots, and improving spectrum utilization efficiency.

In the embodiment of the present disclosure, the symbol corresponding to the guard interval configured by the network device is left blank, so no data transmission is performed in the guard interval in the SL time slot. Therefore, the terminal can perform the above-mentioned network switching within the period of the guard interval. In this way, the network handover will not occupy the time corresponding to the NR time slot, thereby improving handover efficiency and spectrum utilization.

In this embodiment of the present disclosure, the guard interval of the SL may be in units of symbols corresponding to the SL time slot, and may be configured as one or more symbols according to the network switching time of the terminal. The duration corresponding to the number of one or more symbols can cover the network switching time, thereby facilitating the terminal to perform network switching within the time period in which the guard interval is located.

In some embodiments, the method further includes:

The guard interval of the SL is configured according to the network switching time, the timing advance value of the terminal, and the SCS value of the SL carrier.

When considering the handover between the time slot of the NR licensed spectrum service and the SL service, the synchronization between the time slots of the two services needs to be considered. When the base station is covered by the base station, and the base station is used as the synchronization source, there is a time difference of timing advance (T _TA ) corresponding to the NR uplink time slot between the two time slots. Specifically, for the terminal-licensed spectrum service, due to the Time Advance (TA) mechanism, the UL (Uplink, uplink) transmission must be received in advance of the DL (Downlink, downlink) to ensure that multiple terminals are in the When arriving at the base station after passing through different paths, the uplink subframes are aligned in time, and the advance value is determined by two sets of parameters, N _{TA, SL} and N _{TA_offset} , which are added together to obtain T _TA . In the SL service, N _{TA, SL} and N _{TA_offset} are all set to 0. That is, the terminal immediately transmits the SL signal after receiving the downlink signal of the licensed spectrum. In this case, terminal SL transmissions are time-aligned with terminal DL receptions. Combining these two cases, there is a long time overlap of T _TA between the time slots of NR and SL, as shown in Figure 6, which needs to be taken into account when considering the switching between the two and using the guard interval .

Based on the SL frame structure, the last symbol of its time slot will be left blank to serve as the GP, that is, the above-mentioned guard interval. Therefore, considering switching from SL service to NR licensed spectrum service within this guard interval, the existing guard interval time can be used to save the occupied time of switching time on NR time slot, so as to improve the efficiency of spectrum utilization and the speed of switching. . At the same time, it should be noted that the guard interval GP should be able to cover the switching time Ts.

Considering that the GP itself is 1 symbol, the specific time length of the GP is directly related to the SCS, and in the value of Ts, T _TA is the timing advance configured by the network, and Switching Period, that is, the network switching time reported by the terminal and the terminal's own capability. Therefore, in order to ensure that GP>Ts, the network device may configure the guard interval of the SL according to the above-mentioned network switching time, the timing advance value of the terminal, and the SCS value of the SL carrier.

In the switching between NR and SL, in addition to considering the network switching time, timing advance value and other factors involved in the above-mentioned embodiment, it is also necessary to consider the process of the transition of SL carrier power and the process of transition of NR carrier power, Exemplarily, this process requires 2*transient period (twice the transition time), and 2*transient period can be a fixed value, such as 20us. Therefore, the actual switching time Ts is: Ts=2×transient period+Switching period+T _TA . That is to say, in the whole handover process of the terminal, it is necessary to go through the duration of the SL carrier power from non-existent change, the duration corresponding to the network switching time, the duration corresponding to the timing advance value, and the transition of the NR carrier power from zero to non-existent. duration. In this way, when determining the guard interval, the sum of the above durations can be used as a reference value, and the duration of the guard interval needs to be greater than the above total duration, so that the entire handover process is performed within the duration range of the guard interval.

In this way, the duration of the guard interval may cover the duration of the Ts, so as to ensure that the entire handover process is performed within the period of the guard interval.

The sum of the duration that the power of the terminal in the NR is switched from the ON state to the OFF state and the duration that the power of the terminal in the SL is switched from the OFF state to the ON state. In the embodiment of the present disclosure, the network switching of the terminal may be a switching process from the SL service to the NR service. Therefore, the time required for the above power change includes the time when the power of the SL is switched from the ON state to the OFF state and the power of the NR is determined by The sum of the duration of the transition from the off state to the on state. In addition, the network switching of the terminal can also be a switching process from the NR service to the SL service. Therefore, the above-mentioned power changes can also include the duration of the power of the NR switching from the on state to the off state and the power of the SL switching from the off state to the on state. sum of durations.

The NR service and the SL service have corresponding synchronization time axes, therefore, no matter what kind of conversion relationship, it can be performed on the time axis using the guard interval period corresponding to the SL service. In this embodiment of the present disclosure, the duration of the guard interval may be configured according to one of the above durations as the duration required for power change.

Of course, in order that in any switching process, the switching process is performed within the time period of the guard interval, the duration of the guard interval may be determined according to the longer one of the above two power change durations.

In some embodiments, the method further includes:

In the embodiment of the present disclosure, the single symbol duration of the SL time slot is determined by the SCS value, and the SCS value is determined based on the frequency band, phase noise, and Doppler frequency shift corresponding to the SL communication. Therefore, based on the application scenarios of different terminals, the SCS values configured for them may also be different.

Here, the network device may determine the duration of a single symbol of its SL time slot according to the SCS value corresponding to the terminal, and then determine the number of symbols corresponding to the guard interval according to parameters such as the network switching time reported by the terminal. Therefore, the duration of the above guard interval is an integer multiple of the duration of a single symbol, and the duration can cover the duration required for the terminal to perform network handover.

In some embodiments, the method further includes:

The network switching time supported by the receiving terminal includes:

In the embodiment of the present disclosure, the network device configures the guard interval of the terminal. Therefore, in order to configure the guard interval, the network device may instruct the terminal to report the network switching time corresponding to the terminal capability. When receiving the network switching time reported by the terminal based on the indication information sent by the network device, the network device may configure the SL of the terminal based on the network switching time, and determine the number of symbols corresponding to the guard interval. The network device can send the configured network interval to the terminal, so that the terminal can use the duration of the guard interval to perform handover when performing network handover, which reduces the occupation of NR time slots, improves handover efficiency, and improves spectrum utilization.

The embodiments of the present disclosure also provide the following examples:

Aiming at the handover between the NR and NR Sidelink services on the licensed spectrum, that is, the above-mentioned SL service, the embodiments of the present disclosure propose a handover that combines the SL with the GP and places the handover process in the GP to achieve higher spectrum utilization efficiency. method. At the same time, considering the possible situation of Ts>GP between the handover time Ts and the guard interval GP, that is, the handover process cannot be completely placed in the GP, a method for adjusting the GP is given.

In the embodiment of the present disclosure, the terminal reports the shortest NR and SL switching time T _{NRsidelinkswitch} supported by the terminal, and the network advances the T TA value and the SCS value of the SL carrier according to the switching time reported by the terminal, in combination with the timing advance T _TA value configured by the terminal at the current moment, and the SL carrier. The number of symbols that need to be left blank at the end of the SL time slot to be configured is determined as the guard interval GP, and the terminal will complete the handover from SL to NR within the GP time period.

As shown in FIG. 7 , the SL configuration method provided by the embodiment of the present disclosure includes the following steps:

Step S401, the base station sends to the terminal instructing the terminal to report the switching capability of NR and SL, that is, the network switching time;

Step S402, the terminal reports the longest network switching time that it supports;

Step S403, the base station determines the number of the last symbols of the SL time slot that needs to be configured as the GP according to the feedback switching time;

Step S404, the base station sends the configured number of symbols of the GP to the terminal.

The number of symbols of the GP configured by the base station can be determined by the following formula 1:

Among them, Ceiling represents rounding up;

T _{NRsidelinkswitch} represents the switching time capability reported by the terminal, in us (microseconds);

T _TA represents the timing advance value configured by the current network device to the terminal, in us;

Exemplarily, in the above formula (1), the sum of the durations required for the processes of SL carrier power from presence to absence and NR carrier power from non-existence to presence is 20us.

Among them, SCS is the subcarrier spacing, in kHz (kilohertz) as the unit.

In the embodiment of the present disclosure, the terminal reports to the network device according to its capability, its T _{NRsidelinkswitch} = 20us, the T _TA configuration is 20us, and the SCS of the SL carrier is 15kHz, then according to the above formula 1, the network side calculates the number of symbols of the GP is the following formula 2:

GP=Ceiling(60/71)=1 (2)

The last symbol of SL configured by the network device is used as GP. The duration of this GP is 71us. The terminal completes the cycle of changing the SL power from the ON state to the OFF state, and then switches from the SL to the NR, and the NR power changes from the OFF state to the ON state. The change period of the state, plus the timing advance, as shown in FIG. 8 , it takes a total of 60us to complete the entire switching process, and the whole of the switching process can be located in one symbol of the above-mentioned GP. Since the entire handover process is performed in the GP, the time slots and symbols of the SL and NR will not be occupied, thus improving the spectral efficiency of the network as a whole.

As shown in FIG. 9 , an embodiment of the present disclosure further provides an SL configuration apparatus 900, applied to a terminal, including:

The reporting module 901 is configured to report the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches the network between the SL and the NR;

The first receiving module 902 is configured to receive the guard interval of the SL configured based on the network switching time.

In some embodiments, the apparatus further includes:

The reporting module includes:

As shown in FIG. 10 , an embodiment of the present disclosure further provides an apparatus 1000 for configuring an SL, which is applied to a network device, including:

The third receiving module 1001 is configured to receive the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches the network between the SL and the NR;

The first sending module 1002 is configured to send the guard interval of the SL configured based on the network switching time.

In some embodiments, the apparatus further includes:

The third receiving module includes:

Regarding the apparatus in the above-mentioned embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

FIG. 11 is a structural block diagram of a communication device provided by an embodiment of the present disclosure. The communication device may be a terminal, such as a user equipment UE or the like involved in any of the foregoing embodiments. For example, the communication device 1100 may be a mobile phone, computer, digital broadcast user equipment, messaging device, game console, tablet device, medical device, fitness device, personal digital assistant, and the like.

11, the communication device 1100 may include at least one of the following components: a processing component 1112, a memory 1104, a power supply component 1106, a multimedia component 1108, an audio component 1110, an input/output (I/O) interface 1112, a sensor component 1114, and Communication component 1116.

The processing component 1112 generally controls the overall operation of the communication device 1100, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 1112 may include at least one processor 1120 to execute instructions to perform all or part of the steps of the above-described methods. Additionally, the processing component 1112 may include at least one module that facilitates interaction between the processing component 1112 and other components. For example, processing component 1112 may include a multimedia module to facilitate interaction between multimedia component 1108 and processing component 1112.

The memory 1104 is configured to store various types of data to support operation at the communication device 1100 . Examples of such data include instructions for any application or method operating on the communication device 1100, contact data, phonebook data, messages, pictures, videos, and the like. Memory 1104 may be implemented by any type of volatile or non-volatile storage device or combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic or Optical Disk.

Power supply component 1106 provides power to various components of communication device 1100 . Power supply components 1106 may include a power management system, at least one power supply, and other components associated with generating, managing, and distributing power to communication device 1100 .

The multimedia component 1108 includes a screen that provides an output interface between the communication device 1100 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes at least one touch sensor to sense touch, swipe, and gestures on the touch panel. The touch sensor may not only sense the boundaries of a touch or swipe action, but also detect wake-up time and pressure associated with the touch or swipe action. In some embodiments, the multimedia component 1108 includes a front-facing camera and/or a rear-facing camera. When the communication device 1100 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each of the front and rear cameras can be a fixed optical lens system or have focal length and optical zoom capability.

Audio component 1110 is configured to output and/or input audio signals. For example, audio component 1110 includes a microphone (MIC) that is configured to receive external audio signals when communication device 1100 is in operating modes, such as call mode, recording mode, and voice recognition mode. The received audio signal may be further stored in memory 1104 or transmitted via communication component 1116 . In some embodiments, audio component 1110 also includes a speaker for outputting audio signals.

The I/O interface 1112 provides an interface between the processing component 1112 and a peripheral interface module, which may be a keyboard, a click wheel, a button, and the like. These buttons may include, but are not limited to: home button, volume buttons, start button, and lock button.

Sensor assembly 1114 includes at least one sensor for providing various aspects of status assessment for communication device 1100 . For example, the sensor component 1114 can detect the open/closed state of the device 1100, the relative positioning of components, such as the display and keypad of the communication device 1100, the sensor component 1114 can also detect the communication device 1100 or a component of the communication device 1100 The position of the communication device 1100 changes, the presence or absence of the user's contact with the communication device 1100, the orientation or acceleration/deceleration of the communication device 1100, and the temperature change of the communication device 1100. Sensor assembly 1114 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. Sensor assembly 1114 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 1114 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

Communication component 1116 is configured to facilitate wired or wireless communication between communication device 1100 and other devices. The communication device 1100 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In one exemplary embodiment, the communication component 1116 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1116 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, the communication device 1100 may be implemented by at least one application specific integrated circuit (ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate An array (FPGA), controller, microcontroller, microprocessor, or other electronic component implementation for performing the above method.

In an exemplary embodiment, there is also provided a non-transitory computer readable storage medium including instructions, such as a memory 1104 including instructions, executable by the processor 1120 of the communication device 1100 to perform the method described above. For example, the non-transitory computer-readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.

As shown in FIG. 12 , an embodiment of the present disclosure shows the structure of another communication device. The communication device may be the base station and other network devices involved in the embodiments of the present disclosure. For example, the communication device 1200 may be provided as a network device. 12, the communication device 1200 includes a processing component 1222, which further includes at least one processor, and a memory resource, represented by memory 1232, for storing instructions executable by the processing component 1222, such as an application program. An application program stored in memory 1232 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processing component 1222 is configured to execute instructions to perform any of the aforementioned methods applied to the communication device.

The communication device 1200 may also include a power supply assembly 1226 configured to perform power management of the communication device 1200, a wired or wireless network interface 1250 configured to connect the communication device 1200 to a network, and an input output (I/O) interface 1258 . Communication device 1200 may operate based on an operating system stored in memory 1232, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™ or the like.

Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any modifications, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or techniques in the technical field not disclosed by this disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

It should be understood that the present invention is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

A method for configuring a sidelink SL, wherein the method is executed by a terminal, comprising:

reporting the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches networks between the SL and the new air interface NR;

A guard interval of the SL configured based on the network switching time is received.
The method according to claim 1, wherein the guard interval is used for the terminal to perform network handover between the SL and the NR within the period of the guard interval of the SL.
The method of claim 1, wherein the guard interval of the SL is the number of symbols blanked at the end of the SL time slot.
The method according to claim 1, wherein the duration of the guard interval is an integer multiple of the duration of a single symbol.
The method according to any one of claims 1 to 4, wherein the method further comprises:

receiving indication information that instructs the terminal to report the network switching time;

The reporting of the network switching time supported by the terminal includes:

According to the indication information, the network switching time is reported.
A method for configuring an SL, wherein the method is executed by a network device, comprising:

receiving the network switching time supported by the terminal, wherein the network switching time is the time for the terminal to switch networks between the SL and the NR;

The guard interval of the SL configured based on the network switching time is sent.
The method according to claim 6, wherein the guard interval is used for the terminal to perform network handover between the SL and the NR within the period of the guard interval of the SL.
The method of claim 6, wherein the guard interval of the SL is the number of symbols that are blank at the end of the SL time slot.
The method of claim 6, wherein the method further comprises:

The guard interval of the SL is configured according to the network switching time, the timing advance value of the terminal, and the subcarrier spacing SCS value of the SL carrier.
9. The method of claim 9, wherein the duration of the guard interval is greater than or equal to the sum of the network switching time, the timing advance value, and the duration required for the terminal power change.
The method according to claim 10, wherein the time duration required for the terminal power to change includes:

The sum of the duration that the power of the terminal in the SL is switched from the on state to the off state and the duration of the power of the terminal in the NR that is switched from the off state to the on state; or

The sum of the duration that the power of the terminal in the NR is switched from the ON state to the OFF state and the duration that the power of the terminal in the SL is switched from the OFF state to the ON state.
The method of claim 9, wherein the method further comprises:

According to the SCS value, the duration of a single symbol is determined; wherein, the duration of the guard interval is an integer multiple of the duration of the single symbol.
The method according to any one of claims 6 to 12, wherein the method further comprises:

sending indication information that instructs the terminal to report the network switching time;

The network switching time supported by the receiving terminal includes:

The network switching time reported by the terminal based on the indication information is received.
An SL configuration device, wherein the device is applied to a terminal, comprising:

a reporting module, configured to report the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches networks between the SL and the NR;

The first receiving module is configured to receive the guard interval of the SL configured based on the network switching time.
The apparatus according to claim 14, wherein the guard interval is used for the terminal to perform network handover between the SL and the NR within the period of the guard interval of the SL.
The apparatus of claim 14, wherein the guard interval of the SL is the number of symbols blanked at the end of the SL slot.
The apparatus of claim 14, wherein the duration of the guard interval is an integer multiple of the duration of a single symbol.
The apparatus of any one of claims 14 to 17, wherein the apparatus further comprises:

a second receiving module, configured to receive indication information that instructs the terminal to report the network switching time;

The reporting module includes:

The reporting submodule is configured to report the network switching time according to the indication information.
An SL configuration apparatus, wherein the apparatus is applied to network equipment, comprising:

a third receiving module, configured to receive the network switching time supported by the terminal, wherein the network switching time is the time when the terminal switches the network between the SL and the NR;

A first sending module, configured to send the guard interval of the SL configured based on the network switching time.
The apparatus according to claim 19, wherein the guard interval is used for the terminal to perform network handover between the SL and the NR within a period of the guard interval of the SL.
The apparatus of claim 19, wherein the guard interval of the SL is the number of symbols blanked at the end of the SL slot.
The apparatus of claim 19, wherein the apparatus further comprises:

A processing module configured to configure the guard interval of the SL according to the network switching time, the timing advance value of the terminal and the SCS value of the SL carrier.
23. The apparatus of claim 22, wherein the duration of the guard interval is greater than or equal to the sum of the network switching time, the timing advance value, and the duration required for the terminal power change.
The apparatus according to claim 23, wherein the time duration required for the terminal power to change includes:

The sum of the duration that the power of the terminal in the SL is switched from the on state to the off state and the duration of the power of the terminal in the NR that is switched from the off state to the on state; or

The sum of the duration that the power of the terminal in the NR is switched from the ON state to the OFF state and the duration that the power of the terminal in the SL is switched from the OFF state to the ON state.
The apparatus of claim 22, wherein the apparatus further comprises:

The determining module is configured to determine the duration of a single symbol according to the SCS value; wherein, the duration of the guard interval is an integer multiple of the duration of the single symbol.
The apparatus of any one of claims 19 to 25, wherein the apparatus further comprises:

a second sending module, configured to send indication information that instructs the terminal to report the network switching time;

The third receiving module includes:

The receiving submodule is configured to receive the network switching time reported by the terminal based on the indication information.
A communication device, wherein the communication device includes at least a processor and a memory for storing executable instructions that can run on the processor, wherein:

When the processor is used to run the executable instructions, the executable instructions execute the steps in the SL configuration method provided by any one of claims 1 to 5 or 6 to 13 above.
A non-transitory computer-readable storage medium, wherein computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, any one of the above claims 1 to 5 or 6 to 13 is realized. Steps in a provided SL configuration method.