WO2018137284A1

WO2018137284A1 - Method and device for transmitting paging message

Info

Publication number: WO2018137284A1
Application number: PCT/CN2017/078198
Authority: WO
Inventors: 徐海博; 邝奕如; 坦尼•纳坦•爱德华
Original assignee: 华为技术有限公司
Priority date: 2017-01-25
Filing date: 2017-03-24
Publication date: 2018-08-02
Also published as: CN109923912A; CN109923912B; CN114845391A; CN114845391B

Abstract

The present application discloses a method and a device for transmitting a paging message, relates to the technical field of communications, and resolves the issue in which a paging message transmitted by a base station cannot be received when eRemote UE is located outside the coverage of the base station. The method of the present invention comprises : receiving by first user equipment a first message transmitted from a network device, wherein the first message is for paging second user equipment and at least comprises paging information of the second user equipment; the first user equipment generating a second message according to the first message, wherein the second message is for paging the second user equipment and comprises the paging information of the second user equipment; and the first user equipment determining a monitoring period in which the second user equipment monitors the second message, acquiring a resource for transmitting the second message, and using the resource for transmitting the second message to transmit the second message to the second user equipment in the monitoring period. The solutions provided by the present application are suitable for application to paging message transmission.

Description

Method and device for transmitting paging message

This application claims the priority of the Chinese Patent Application, filed on Jan. 25, 2017, filed Jan. in.

Technical field

The present application relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for transmitting a paging message.

Background technique

Currently, there are two communication modes between the user equipment (User Equipment, UE) and the base station, which are a direct connection communication mode and a non-direct connection communication mode. The direct connection communication mode refers to that the UE directly connects to the base station and performs communication. The non-direct connection communication mode is that the remote user equipment (Remote UE) is connected to the base station through a relay user equipment (Relay User Equipment, Relay UE), and the Relay UE can pass the Internet Protocol (IP) layer. (Layer 3) Implement data forwarding between the base station and the Remote UE. However, in the process of forwarding data by the Relay UE, the Packet Data Convergence Protocol (PDCP) layer of the Remote UE can solve the data of the Remote UE, so that the data of the Remote UE has security risks and the like. In order to solve these problems, the Relay UE can forward data by using a data relay method below the PDCP layer based on the Radio Link Control (RLC) layer. In this case, the remote user equipment can be called an evolution. Evolved Remote UE (eRemote UE), the relay user equipment may be called an Evolved Relay UE (eRelay UE).

The eRemote UE may receive a control message such as a system message and a paging message sent by the base station by using a direct link with the base station, and perform a data plane with the base station by using a side link between the eRelay UE and the eRelay UE. The transmission of data. When the core network needs to send data to the eRemote UE in the RRC_IDLE state, the base station needs to send a paging message to the eRemote UE to trigger the eRemote UE to enter the RRC_CONNECTED state, and the eRemote UE only needs to wake up once in one paging cycle, and the base station will At the time point when the eRemote UE wakes up, a paging message is sent to the eRemote UE through a Physical Downlink Control Channel (PDCCH).

However, if the eRemote UE is outside the coverage of the base station, the paging message sent by the base station through the PDCCH cannot be accepted, and the base station cannot establish a communication connection with the eRemote UE.

Summary of the invention

The embodiment of the present application provides a method and an apparatus for transmitting a paging message, which can solve the problem that the paging message sent by the base station cannot be received when the eRemote UE is outside the coverage of the base station.

To achieve the above objective, the embodiment of the present application adopts the following technical solutions:

In a first aspect, an embodiment of the present application provides a method for transmitting a paging message, where the method includes:

The first user equipment receives the first message sent by the network device, where the first message is used to page the second user equipment, and the first message includes at least the paging information of the second user equipment. The first user equipment then generates a second message according to the first message, where the second message is used to page the second user equipment, and the second message includes the paging information of the second user equipment. The first user equipment determines that the second user equipment listens to the listening time of the second message and acquires a resource for sending the second message, so that the first user equipment can use the The resource that sends the second message sends the second message to the second user equipment.

The paging information of the second user equipment includes the second user equipment identifier and core network domain information. The first user equipment may be an eRemote UE, the second user equipment may be an eRemote UE, the network equipment may be a base station, and the second user equipment identifier may be an IMSI, an S-TMSI, an IMSI mod 1024 of the second user equipment, or other may An identifier that represents the identity of the second user device.

Since the base station may first send the first message to the first user equipment, and then the first user equipment determines that the second user equipment monitors the listening time of the second message, the first user equipment may be used to page the second user during the listening time. The second message of the device is sent to the second user equipment. Since the first user equipment is generally within the coverage of the base station, even if the second user equipment is not within the coverage of the base station, the first user equipment can receive the Call the message.

In a possible design, before the first user equipment determines the listening time, the information for determining the listening time needs to be acquired first, and the method for obtaining the information for determining the monitoring time is:

The first user equipment receives the third message sent by the second user equipment, where the third message carries information for determining the listening time; or the first user equipment receives the fourth message sent by the network device, and the fourth message is carried in the fourth message. Information for determining the listening time.

It can be seen that before the first user equipment determines the listening time, the second user equipment or the network device sends information for determining the listening time to the first user equipment, and the first user equipment can determine the listening time of the second user equipment. So that the time for the first user equipment to send the second message is the same as the time for the second user equipment to listen to the second message, so that the paging message can be received even if the second user equipment is not within the coverage of the base station, and compared to The base station transmits a paging message to the second user equipment through the downlink, and the power consumed by the first user equipment to transmit the paging message to the second user equipment through the sidelink is lower.

In a possible design, the information sent by the second user equipment or the network device to the first user equipment for determining the listening time includes the second user equipment identifier, the specific paging period of the second user equipment, and the system default paging. At least one of the cycles.

In a possible design, before determining the listening time, the first user equipment needs to determine a first identity for determining the listening time, and also needs to determine a first paging cycle for determining the listening time.

The first identifier is the first user equipment identifier or the second user equipment identifier, and the first identifier that is used by the first user equipment and the second user equipment to determine the listening time is the same, that is, the first identifier used by the first user equipment. If the first user equipment is identified, the first identifier used by the second user equipment is also the first user equipment identifier; if the first identifier used by the first user equipment is the second user equipment identifier, the second user equipment The first identifier adopted is also the second user equipment identifier.

The first paging cycle is the particular paging cycle, or the smaller of the particular paging cycle and the system default paging cycle. The specific paging cycle is a UE-specific Paging cycle of the second user equipment eRemote UE, and the system default paging cycle is a default Paging cycle broadcast by the base station. The first user equipment and the second user equipment employ the same first paging cycle when determining the listening time.

In this manner, after the first user equipment determines the first identifier for determining the listening time and the first paging period for determining the listening time, the determining the listening time may be further completed according to the combining the first identifier and the first paging period. The process further ensures that the first user equipment can send a second message to the second user equipment on the sidelink, and the second user equipment can receive the second message on the sidelink.

In a possible design, before the first user equipment determines the listening time, the first user equipment may further receive resource pool configuration information configured by the network device for transmitting the second message, where the resource pool configuration information includes At least one of the following information:

Resource pool offset;

Resource pool period length;

a bitmap bitmap for indicating a subframe in which the second message is transmitted;

A frequency domain resource location for transmitting the second message.

In a possible design, the first user equipment determines the listening time of the second user equipment to listen to the second message, which may be implemented as follows:

Determining, by the first user equipment, the location of the radio frame and the location of the subframe monitored by the second user equipment in the sidelink sidelink according to the first identifier, the first paging period, and the nB, where the nB is a sub-frame period The number of frames.

In this way, after the first user equipment determines the radio frame position and the subframe position monitored by the second user, the second message can be sent on the determined radio frame and the subframe, so that the second user equipment does not need to constantly monitor the sidelink, and only needs to Wake up when listening to the second message to receive the second message.

In a possible design, the first user equipment determines the location of the radio frame and the location of the subframe monitored by the second user equipment in the sidelink sidelink according to the first identifier, the first paging period, and the nB, which may be implemented as :

Determining, by the first user equipment, the location of the radio frame and the location of the subframe monitored by the second user equipment when listening to the downlink according to the first identifier, the first paging period, and the nB, and then the first user equipment monitors the downlink according to the second user equipment. The location of the radio frame and the subframe monitored by the way to determine the second user equipment The location of the radio frame and the location of the subframe monitored on the sidelink sidelink.

In a possible design, the first user equipment may determine the location of the radio frame and the location of the subframe that the first user equipment listens to when listening to the downlink according to the following formula.

Formula 1: SFN mod T=(T div N)*(UE_ID mod N)

Equation 2: i_s=floor(UE_ID/N)mod Ns

Wherein, the SFN is the location of the subframe; T is the first paging cycle; N is min (T, nB), and is used to indicate the number of radio frames included in a first paging cycle; Ns:max(1, nB /T), used to indicate the number of subframes included in a radio frame; UE_ID is the first identifier.

The SFN obtained by Equation 1 can determine the location of the radio frame monitored by the second user equipment when listening to the downlink. According to Equation 2, i_s can be obtained, and according to the value of i_s and the value of NS and the position of the subframe. The relationship table can determine the location of the radio frame that the second user equipment listens to when listening to the downlink. The value of the i_s corresponding to the FDD system and the TDD system is different from the correspondence between the value of the NS and the subframe position.

In a possible design, the second user equipment adds a first offset to the subframe position monitored by the second user equipment when the second user equipment listens to the downlink, where the first offset is greater than or a positive integer equal to 0; or, the location of the subframe monitored by the second user equipment in the sidelink is the first in the resource pool after adding the second offset to the location of the subframe monitored by the second user equipment when listening to the downlink A subframe that is operative to transmit the second message, the second offset being a positive integer greater than or equal to zero.

In a possible design, for the FDD system, the location of the radio frame and the location of the subframe monitored by the second user equipment while listening to the downlink are the same as the radio frame position and the subframe position of the second user equipment in the sidelink listening;

For the TDD system, the location of the radio frame that the second user equipment listens while listening to the downlink is the same as the location of the radio frame that the second user equipment listens on the sidelink. According to different TDD configurations, the location of the subframe monitored by the second user equipment while listening to the downlink has a different correspondence relationship with the location of the subframe monitored by the second user equipment in the sidelink.

One possible correspondence is that when the second terminal needs to listen to the subframe number 0 in the downlink, the second terminal corresponding to the second terminal corresponding to the TDD configuration 0 to the TDD configuration 6 needs to be monitored in the sidelink. Number 2;

When the subframe number that the second terminal needs to monitor in the downlink is 1, the second frame corresponding to the second terminal corresponding to the TDD configuration 0 to the TDD configuration 6 needs to be monitored in the sidelink: 3, 3, 2 3, 3, 2, 3;

When the subframe number that the second terminal needs to listen to in the downlink is 5, the subframe numbers that need to be monitored in the sidelink from the TDD configuration 0 to the TDD configuration 6 are: 7. 7, 7, 2, 2, 7;

When the second terminal needs to listen to the subframe number 6 in the downlink, the configuration from the TDD The subframe numbers corresponding to the second terminal corresponding to the TDD configuration 6 that need to be monitored in the sidelink are: 8, 8, 7, 3, 3, 2, and 8, respectively.

In a possible design, the first user equipment determines the listening time of the second user equipment to listen to the second message, and specifically includes:

Determining, by the first user equipment, the number N of resource pool cycles included in a first paging cycle of the second user equipment according to the resource pool configuration information, the first identifier, and the first paging period, and using the resource pool period in each resource pool period After the number of subframes M of the second message is sent, the first user equipment determines that the second user equipment needs to monitor the resource pool period number of the second message in a first paging period, and the resource pool period number is the first number. Identifies mod N. Then, the first user equipment determines that the second user equipment needs to monitor the subframe number of the second message in a resource pool period, where the subframe number is floor (first identifier /N) mod M, and then the first user equipment can Determining, according to the resource pool period number and the subframe number, a subframe position that the second user equipment listens on the sidelink.

In a possible design, the first user equipment determines the listening time of the second user equipment to listen to the second message, which may be implemented by: the first user equipment determining the third offset according to the first identifier and the first paging period. PO_offset, and then the first user equipment determines, according to [frame number *10+subframe number+SL_offset]modulo (first paging cycle)=PO_offset, that the second user equipment listens to the frame number and the subframe number of the second message on the sidelink, where SL_offset is the resource pool offset.

In a possible design, if the first user equipment is in the RRC_IDLE state, after the first user equipment receives the first message sent by the network device, the first user equipment may trigger an RRC connection establishment procedure to switch to the RRC_CONNRECTED state. After the first user equipment is switched to the RRC_CONNRECTED state, the first user equipment and the base station can communicate by using a dedicated message, so that the first user equipment can request the base station to acquire the resource for sending the second message, or the base station actively passes. The dedicated message sends a resource for transmitting the second message to the first user equipment, thereby enabling the first user equipment to use the resource provided by the base station to send the second message through the sidelink.

In a possible design, when the network device needs to send the first message to the first user equipment, if the first user equipment is in the RRC_IDLE state, the network device triggers the RRC connection establishment process of the first user equipment, so that the first user The device transitions to the RRC_CONNRECTED state. After the first user equipment is switched to the RRC_CONNRECTED state, the first user equipment and the base station can communicate by using a dedicated message, so that the first user equipment can request the base station to acquire the resource for sending the second message, or the base station actively passes. The dedicated message sends a resource for transmitting the second message to the first user equipment, thereby enabling the first user equipment to use the resource provided by the base station to send the second message through the sidelink.

In a possible design, the first user equipment acquires a resource for sending the second message, The first user equipment may send a fifth message to the network device, where the fifth message is used to request to acquire a resource for sending the second message;

The first user equipment receives the sixth message sent by the network device, where the sixth message includes resource information or resource pool information that the network device allocates for the first user equipment to send the second message.

In one possible design, the fifth message includes at least one of the following information:

The purpose of the request is to indicate that the purpose of the fifth message is to acquire a resource for sending the second message;

The time when the second message was sent;

The number of paging information included in the second message, and each second user equipment corresponds to one paging information;

The number of bits contained in the second message.

Each group of paging information includes a second device identifier and a core domain information, and the core domain information is a CS domain or a PS domain.

In a possible design, the first user equipment acquires a resource for sending the second message, and may also be implemented as:

The first user equipment acquires a resource for sending the second message from the first message, where the first message includes resource information or resource pool information allocated by the network device for the first user equipment to send the second message.

In a possible design, the first user equipment may further receive the first message by using the RRC layer, and generate, by the RRC layer, the second message according to the first message.

The second message generated by the first user equipment by using the RRC layer may be applicable to any short-distance connection technology, not only limited to the sidelink connection, but also may be a WLAN connection, etc., and the paging message transmitted by the application is extended. The scope of application of the method.

In a second aspect, an embodiment of the present application provides a method for transmitting a paging message, where the method includes:

The second user equipment determines the listening time of the second message, the second message is used to page the second user equipment, the second message includes the paging information of the second user equipment, and then the second user equipment monitors the monitoring time. The second message sent by the first user equipment receives the second message when the second message is monitored.

It can be seen that the second user equipment can first determine the listening time of the second message, and can listen to the second message sent by the first user equipment during the listening time, which is equivalent to the first user equipment transmitting the paging message through the sidelink. Even if the second user equipment is not within the coverage of the base station The second message can be received through the sidelink. In addition, the process of transmitting the second message through the sidelink between the first user equipment and the second user equipment consumes more power than transmitting the second message through the downlink between the base station and the second user equipment. small.

In a possible design, before the second user equipment determines to monitor the listening time of the second message, the information for determining the listening time needs to be acquired first, and the method for obtaining the information for determining the monitoring time is:

The second user equipment further needs to send a third message to the first user equipment, where the third message carries a specific paging period of the second user equipment, and then the second user equipment receives the seventh message sent by the first user equipment, where the The seven messages carry information for determining the listening time.

It can be seen that before the first user equipment determines the listening time, the first user may receive the information sent by the second user equipment for determining the listening time, and the second user equipment may determine the listening time of the second user equipment, so that The time when the second user equipment sends the second message is the same as the time when the second user equipment listens to the second message, so that the paging message can be received even if the second user equipment is not within the coverage of the base station, and the downlink is compared to the base station. The link transmits a paging message to the second user equipment, and the power consumed by the first user equipment to transmit the paging message to the second user equipment through the sidelink is lower.

In a possible design, the information for determining the listening time includes at least one of a first user equipment identifier, nB, and a system default paging cycle broadcast by the network device, and nB is the number of subframes included in one paging cycle. ;or,

The information used to determine the listening time is resource pool configuration information configured by the network device for transmitting the second message, and the resource pool configuration information includes at least one of the following information:

Resource pool offset;

Resource pool period length;

A frequency domain resource location for transmitting the second message.

After the first user equipment acquires the resource pool configuration information for transmitting the second message, the resource pool configuration information may be used to determine, by the resource pool configuration information, the listening time of the second user equipment to listen to the second message, and may further determine, for sending the second message. The first user equipment can send the second message to the second user equipment by using the resource for sending the second message, and the first user equipment and the second user equipment can use the sidelink transmission. Paging message.

In one possible design, the second user equipment determines a first identity for determining the listening time and also determines a first paging cycle for determining the listening time. The first identifier is the first user equipment identifier or the second user equipment identifier, and the first user equipment and the second user equipment are used to determine that the first identifier of the listening time is the same. The first paging cycle is a specific paging cycle, or the smaller of the specific paging cycle and the system default paging cycle. The specific paging cycle is a UE-specific Paging cycle of the second user equipment eRemote UE, and the default paging cycle of the system is the default broadcast by the base station. Paging cycle. The first user equipment and the second user equipment employ the same first paging cycle when determining the listening time.

In this manner, after the second user equipment determines the first identifier for determining the listening time and the first paging period for determining the listening time, the determining the listening time may be further completed according to the combining the first identifier and the first paging period. The process, in turn, can monitor the sidelink at the listening time, thereby receiving the second message sent by the second user equipment through the sidelink at the listening time.

In a possible design, the second user equipment determines the listening time of the second message, which can be implemented as follows:

The second user equipment determines the location of the subframe monitored by the second user equipment on the sidelink sidelink according to the first identifier, the first paging cycle, and the nB.

In a possible design, the second user equipment determines the location of the subframe monitored by the second user equipment in the sidelink sidelink according to the first identifier, the first paging period, and the nB, which may be implemented as follows:

Determining, by the second user equipment, the location of the radio frame and the location of the subframe monitored by the second user equipment when listening to the downlink according to the first identifier, the first paging period, and the nB, and then the second user equipment monitors the downlink according to the second user equipment. The location of the radio frame and the subframe monitored by the way, determines the location of the radio frame and the subframe monitored by the second user equipment in the sidelink.

In this way, after the second user equipment determines the listening time for listening to the second message, it is not necessary to always listen to the sidelink, and only needs to wake up at the listening time to listen to the second message.

In a possible design, the second user equipment may determine the location of the radio frame and the location of the subframe that the first user equipment listens to when listening to the downlink according to the following formula.

Formula 1: SFN mod T=(T div N)*(UE_ID mod N)

Equation 2: i_s=floor(UE_ID/N)mod Ns

In a possible design, the second user equipment adds a first offset to the subframe position monitored by the second user equipment when the second user equipment listens to the downlink, where the first offset is greater than or equal to a positive integer of 0; or,

The second user equipment listens to the downlink of the second user equipment at the location of the subframe monitored by the sidelink The position of the subframe monitored by the waypoint plus the second offset, the first subframe in the resource pool that can be used to transmit the second message, and the second offset is a positive integer greater than or equal to 0.

Determining, by the second user equipment, the number N of resource pool periods included in a first paging cycle of the second user equipment according to the resource pool configuration information, the first identifier, and the first paging period, and using the resource pool period in each resource pool period The number M of subframes in which the second message is sent. Then, the second user equipment determines that the second user equipment needs to monitor the resource pool period number of the second message in a first paging period, where the resource pool period number is the first identifier mod N, and then the second user equipment determines During a resource pool period, the second user equipment needs to monitor the subframe number of the second message, and the subframe number is floor (first identifier /N) mod M, and the second user equipment can then use the resource pool period number and the subframe. The number determines the subframe position at which the second user equipment listens on the sidelink.

In a possible design, the second user equipment determines the listening time for listening to the second message, and may also be implemented as:

The second user equipment determines a third offset PO_offset according to the first identifier and the first paging cycle, and then determines the second user according to [frame number *10+subframe number+SL_offset]modulo (first paging cycle)=PO_offset The device monitors the frame number and the subframe number of the second message on the sidelink, where SL_offset is a resource pool offset.

In a third aspect, the present application provides an apparatus for transmitting a paging message, where the apparatus may implement the functions performed by the first user equipment in the foregoing first aspect, and the functions may be implemented by hardware, or may be performed by hardware. Software Implementation. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the apparatus includes a processor and a communication interface configured to support the apparatus to perform the corresponding functions of the above methods. The communication interface is used to support communication between the device and other network elements. The apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.

In a fourth aspect, the present application provides an apparatus for transmitting a paging message, where the apparatus may implement the functions performed by the second user equipment in the foregoing second aspect, and the functions may be implemented by hardware, or may be performed by hardware. Software Implementation. The hardware or software includes one or more modules corresponding to the above functions.

In a fifth aspect, the application provides a system for transmitting a paging message, including the first user equipment, the second user equipment, and the network equipment in the foregoing aspect.

In a sixth aspect, the present application provides a computer storage medium for storing computer software instructions for use in the first user equipment, including a program designed to perform the above aspects.

In a seventh aspect, the application example provides a computer storage medium for storing computer software instructions used by the second user equipment end, which includes a program designed to perform the above aspects.

Compared with the prior art, the base station directly sends a paging message to the second user equipment. When the second user equipment is not within the signal coverage of the base station, the paging message cannot be received. In this application, the base station may Sending the first message to the first user equipment, where the first user equipment and the second user equipment determine the listening time of the second user equipment to listen to the second message, and the first user equipment can be used for paging in the listening time. The second message of the second user equipment is sent to the second user equipment. Since the first user equipment is generally within the coverage of the base station, the second user equipment can receive the first user equipment even if the second user equipment is not within the coverage of the base station. To the paging message.

DRAWINGS

In order to more clearly illustrate the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art description will be briefly described below.

FIG. 1 is a schematic structural diagram of a network structure according to an embodiment of the present application;

2 is a schematic structural diagram of another network structure provided by an embodiment of the present application;

FIG. 3 is a flowchart of a method for transmitting a paging message according to an embodiment of the present application;

FIG. 4 is a flowchart of another method for transmitting a paging message according to an embodiment of the present application;

FIG. 5 is an exemplary schematic diagram of a method for transmitting a paging message according to an embodiment of the present application;

FIG. 6 is an exemplary schematic diagram of another method for transmitting a paging message according to an embodiment of the present disclosure;

FIG. 7 is an exemplary schematic diagram of another method for transmitting a paging message according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of another method for transmitting a paging message according to an embodiment of the present application; FIG.

FIG. 9 is a schematic diagram of another method for transmitting a paging message according to an embodiment of the present application;

FIG. 10 is a schematic diagram of another method for transmitting a paging message according to an embodiment of the present application; FIG.

FIG. 11 is a schematic diagram of another method for transmitting a paging message according to an embodiment of the present application;

FIG. 12 is a schematic diagram of a logical structure of an apparatus for transmitting a paging message according to an embodiment of the present application;

FIG. 13 is a schematic structural diagram of another apparatus for transmitting a paging message according to an embodiment of the present application.

detailed description

The system architecture and the service scenario described in this application are for the purpose of more clearly explaining the technical solutions of the present application, and do not constitute a limitation on the technical solutions provided by the present application. Those skilled in the art may know that with the evolution of the system architecture and new services. The appearance of the scenario, the technical solution provided by the present application is equally applicable to similar technical problems.

It should be noted that, in the present application, the words "exemplary" or "such as" are used to mean an example, illustration, or illustration. Any embodiment or design described in this application as "exemplary" or "for example" The case should not be construed as being more preferred or advantageous over other embodiments or designs. Rather, the use of the words "exemplary" or "such as" is intended to present the concepts in a particular manner.

A User Equipment (UE), also called a terminal, is a device that provides voice and/or data connectivity to a user, for example, a handheld device with a wireless connection function, an in-vehicle device, and the like. Common user devices include, for example, mobile phones, tablets, notebook computers, PDAs, mobile internet devices (MIDs), wearable devices such as smart watches, smart bracelets, pedometers, and the like.

A base station, also known as a radio access network (RAN) device, is a device that accesses a user equipment to a wireless network, including but not limited to: an evolved Node B (eNB), a wireless network. Radio network controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), and home base station (for example, Home evolved NodeB, Or Home Node B, HNB), BaseBand Unit (BBU), future network, such as a 5G network (such as a network applying a new radio technology), a Node B (gNB) that continues to evolve. In addition, it may also include a Wifi access point (AP), a transmission and reception point (TRP), and the like.

The terms "first" and "second" and the like in the specification and claims of the present application are used to distinguish different objects, and are not intended to describe a particular order of the objects. For example, the first user equipment in the application may be an eRelay UE, and the second user equipment may be an eRemote UE.

The principle of the present application is that the base station sends a paging message that needs to be sent to the eRemote UE to the eRelay UE through the downlink, and then the eRelay UE sends the paging message to the eRemote UE through the sidelink (hereinafter, the eRelay UE passes the eRemote UE to the eRemote UE) The paging message sent by the sidelink is called an SL paging message). The method for the eRelay UE to send the SL paging message to the eRemote UE is: the eRelay UE determines the listening time of the eRemote UE to listen to the paging message by using the identifier of the eRemote UE and the UE-specific Paging cycle, and acquires the LA paging message allocated by the base station. The eRelay UE sends a paging message to the eRemote UE using the resources allocated by the base station during the listening time. The eRemote UE also communicates with the eRelay UE to determine the listening time and listen to the SL paging message sent by the eRelay UE. With this method, the base station does not need to directly send a paging message to the eRemote UE, and even if the eRemote UE is not within the coverage of the base station, the paging message can be received by the eRelay UE.

Before describing the technical solutions of the present application in detail, for the sake of easy understanding, the scenarios applied by the embodiments of the present application are first introduced. As shown in FIG. 1, the method for transmitting a paging message provided by the present application can be applied to the network architecture shown in FIG. 1. The network architecture includes: a base station 101, an eRelay UE 102 within the coverage of the base station 101, and a plurality of eRemote UEs 103 having a sidelink connection with the eRelay UE 102. Among them, the eRemote UE103 has the characteristics of small size, low power consumption, and the like, and is generally a wearable device, such as a smart watch or a smart hand. The base station 101 and the eRelay UE 102 can communicate between the uplink and the downlink. The eRelay UE 102 and the eRemote UE 103 can communicate through the sidelink communication technology, and the communication link between the eRelay UE 102 and the eRemote UE 103 can be referred to as a side link, and between the eRelay UE 102 and the eRemote UE 103 The communication can be performed by using the non-3GPP access technology, for example, the Bluetooth access technology, the WALN access technology, and the like. The present application does not limit this. The following is an example in which the eRelay UE 102 and the eRemote UE 103 communicate with each other through sidelink communication. It should be noted that FIG. 1 is only a schematic diagram of a network architecture applied in the present application. In actual deployment, the number of devices in the network structure is not limited to the number of devices shown in FIG. 1.

Specifically, as shown in FIG. 2, the base station 101 may include: a communication interface 1011, a processor 1012, a memory 1013, and at least one communication bus 1014. The communication bus 101 is used to implement connection and mutual communication between the devices. The eRelay UE 102 may include: Communication interface 1021, processor 1022, memory 1023, and at least one communication bus 1024 for implementing connection and mutual communication between these devices; eRemote UE 103 may include: communication interface 1031, processor 1032, memory 1033, and at least A communication bus 1034 is used to implement the connections and intercommunication between these devices.

The communication interface 1011, the communication interface 1021, and the communication interface 1031 can be implemented by an antenna, and can be used for data interaction with an external network element. For example, the communication interface 1011 of the base station 101 can send and receive data packets with the eRelay UE 102 or Other information, and the communication interface 1011 of the base station 101 can also send and receive data packets or other information between the eRemote UE 103 (the connection relationship between the communication interface 1011 and the communication interface 1031 is omitted in FIG. 2); the communication interface 1021 of the eRelay UE 102 can Transmitting or transmitting data packets or other information between the base station 101 or the eRemote UE 103. For example, the communication interface 1031 may send the data of the eRemote UE 103 and other information to the communication interface 1021. After receiving the data or other information, the communication interface 1021 sends data or other information to the communication interface 1011 through the radio bearer between the eRelay UE 102 and the base station. And handed over to the base station 101 for processing.

The processor 1012, the processor 1022, and the processor 1032 may be a central processing unit (CPU), may be an application specific integrated circuit (ASIC), or be configured to be implemented. One or more integrated circuits of embodiments of the invention. For example: one or more microprocessors (English: Digital Singnal Processor, DSP), or one or more Field Programmable Gate Arrays (FPGAs). The processor 1012, the processor 1022, and the processor 1032 have processing management functions. Specifically, the processor 1012 in the base station 101 can process the data or information sent by the received eRelay UE 102, and the processor 1022 in the eRelay UE 102 can The received data or information transmitted by the eRemote UE0103 is processed, and the data or information sent by the base station 101 can also be processed. The processor 1032 in the eRemote UE 103 can process data or information generated by the Remote UE 103 itself or process information or data sent by other devices.

The memory 1013, the memory 1023, and the memory 1033 may be a volatile memory such as a random access memory (RAM) or a non-volatile memory. For example, read-only memory (English: Read-Only Memory, ROM), flash memory, hard disk drive (HDD) or solid state drive (SSD); or the above type of memory The combination. Specifically, the memory 1013, the memory 1023, and the memory 1033 may be The data or program code supporting the data transmission method according to the embodiment of the present invention is stored, so that the processor 1012, the processor 1022, and the processor 1032 perform the embodiments of the present invention according to data or program code stored in the memory of the device in which the device is located. Data transfer method.

The communication bus 1014, the communication bus 1024, and the communication bus 1034 can be divided into an address bus, a data bus, a control bus, etc., and can be an industry standard architecture (Industry Standard Architecture, ISA) bus, and an external device interconnection (English: Peripheral Component) , PCI) bus or extended industry standard architecture (English: Extended Industry Standard Architecture, EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 2, but it does not mean that there is only one bus or one type of bus.

In the network architecture shown in FIG. 1 and FIG. 2, in order to solve the problem that the paging message sent by the base station cannot be received when the eRemote UE is outside the coverage of the base station, the embodiment of the present application provides a transmission search. The method of calling a message is as shown in FIG. 3, and the method includes:

301. The network device sends a first message to the first user equipment, where the first message is used to page the second user equipment, and the first message includes at least paging information of the second user equipment.

The paging information of the second user equipment includes the second user equipment identifier and the core network domain information, and the core network domain information may be a Circuit Switching (CS) domain or a Packet Switching (PS) domain.

The network device in this step may be a base station, and the first user equipment in the embodiment of the present application may be an eRelay UE, and the second user equipment may be an eRemote UE, and the second user equipment described in this embodiment is A second user device having a link with the first user device.

When the base station needs to send data to the eRemote UE in the RRC_IDLE state, it needs to send a paging message to the eRemote UE, thereby triggering the eRemote UE to enter the RRC_CONNECTED state. In order to prevent the eRemote UE that is not in its own coverage from receiving the paging message, the base station sends the paging message to the eRelay UE, and the eRelay UE further sends the paging message to the eRemote UE.

Specifically, the first message sent by the base station to the eRelay UE may be a broadcast message or a dedicated message sent to the eRelay UE. When the first message is a broadcast message, the first message may include paging information of multiple eRemote UEs that the base station needs to send a paging message, where the paging information of the eRemote UE that establishes the sidelink with the eRelay UE is included, and includes The paging information of the eRemote UE that does not establish a sidelink with the eRelay UE; when the first message is a dedicated message sent to the eRelay UE, the first message includes paging information of multiple eRemote UEs that the base station needs to send the paging message, and these The eRemote UE is an eRemote UE that has established a sidelink with the eRelay UE.

302. The first user equipment generates a second message according to the first message, where the second message is used to page the second user equipment, and the second paging message includes the paging information of the second user equipment.

If the first message is a broadcast message, the eRelay UE needs to filter the paging information of the eRemote UE with the sidelink from the first message, and generate a second message for each eRemote UE that is selected, corresponding to The second message of each eRemote UE respectively includes paging information of the respective eRemote UE. Or the eRelay UE generates a second message, the second The message includes paging information of all eRemote UEs carried in the first message. Alternatively, the eRelay UE does not perform any screening, and directly forwards the first message to at least one eRemote UE with its own sidelink.

If the first message is a dedicated message, the eRelay UE needs to obtain the paging information of the eRemote UE in the first message, and generate a second message for each eRemote UE according to the first message, corresponding to the second of each eRemote UE. The messages respectively contain paging information of the respective eRemote UEs. Or the eRelay UE generates a second message, where the second message includes paging information of all eRemote UEs carried in the first message.

Illustratively, the first message received by the eRelay UE1 is a broadcast message, and the first message carries paging information of three second user equipments, which are eRemote UE1, eRemote UE2, and eRemote UE3, respectively. There is a sidelink connection between eRemote UE1 and eRemote UE2 and eRelay UE1, and a sidelink connection exists between eRemote UE3 and eRelay UE2. The eRemote UE1 needs to generate the second message for the eRemote UE1 and the eRemote UE2, and the second message corresponding to the eRemote UE1 includes the paging information of the eRemote UE1, and the second message corresponding to the eRemote UE2 includes the paging information of the eRemote UE2.

303. The first user equipment determines a listening time for the second user equipment to listen to the second message.

The method for determining the listening time by the first user equipment is described in detail in the following embodiments, and details are not described herein.

304. The first user equipment determines a resource used to send the second message.

The method for determining the target resource by the first user equipment is described in detail in the following embodiments, and details are not described herein.

It should be noted that the embodiment of the present application does not limit the execution order between step 302, step 303, and step 304.

305. The second user equipment determines a listening time for listening to the second message.

The method for determining the listening time by the second user equipment is the same as the method for determining the listening time by the first user equipment, but the method for the second user equipment to obtain the parameter for determining the listening time and the method for obtaining the monitoring time by the first user equipment. The method of information is different.

It should be noted that the embodiment of the present application does not limit the execution sequence between step 305 and step 302, step 303, and step 304 above, and step 305 only needs to be performed before step 306.

306. The first user equipment sends a second message to the second user equipment by using a resource for sending the second message at the listening time.

307. The second user equipment monitors the second message sent by the first user equipment during the listening time.

It can be understood that both the first user equipment and the second user equipment have determined that the second user equipment listens to the monitoring time of the second message, and the first user equipment sends the second message at the listening time, where the second user equipment is The second message can be monitored at the listening time.

308. When the second message is monitored, the second user equipment receives the second message.

After receiving the second message, the second user equipment also needs to notify the upper layer protocol layer of the device identifier, so that the upper layer protocol layer triggers the second user equipment to initiate the RRC connection establishment process, and transitions to the RRC_CONNECTED state.

The method for transmitting a paging message provided by the embodiment of the present application may be unable to send a paging message directly to the second user equipment in the prior art, and the second user equipment may not be within the signal coverage of the base station. In the present application, the base station may first send the first message to the first user equipment, and then the first user equipment and the second user equipment determine the listening time of the second user equipment to listen to the second message. A user equipment can send a second message for paging the second user equipment to the second user equipment at the listening time. Since the first user equipment is generally within the coverage of the base station, even if the second user equipment is not in the Within the coverage of the base station, the paging message can also be received by the first user equipment.

In addition, the eRemote UE directly receives the paging message sent by the base station and consumes a higher power, and receiving the paging message through the sidelink between the eRemote UE and the eRelay UE can reduce the consumed power.

In conjunction with the method flow shown in FIG. 3, both the first user equipment and the second user equipment need to first determine the listening time of the second user equipment to listen to the second message, and then the first user equipment passes the sidelink to the second user at the listening time. The device sends the second message to enable the second user equipment to receive the second message at the listening time. The method for determining, by the first user equipment and the second user equipment involved in the foregoing steps 303 and 305, that the second user equipment listens to the listening time of the second message, will be described in detail below.

Before the first user equipment and the second user equipment determine the listening time, the parameters required for determining the listening time are obtained, and based on this, in an implementation manner provided by the embodiment of the present invention, the obtaining determining is monitored. The method of parameters required at time is as shown in FIG. 4, and the method includes:

401. The second user equipment sends a third message to the first user equipment, where the third message carries information used to determine the listening time.

The information used to determine the listening time in the third message may include a specific paging period of the second user equipment (ie, a UE-specific Paging cycle of the eRemote UE), and a default Paging cycle broadcast by the base station. At least one of the second user equipment identification.

It should be noted that the first user equipment and the second user equipment need to use the first identifier when determining the listening time, and the first identifier may be the first user equipment identifier or the second user equipment identifier, the first user. The device and the second user equipment negotiate in advance whether the first identifier used is the first user equipment identifier or the second user equipment identifier. It can be understood that when the first identifier used is the second user equipment identifier, the third user equipment identifier is included in the third message.

It should be noted that the third message may be a newly defined PC5-S message transmitted between the eRemote UE and the eRelay UE. For example, the third message may be determined as a paging monitoring request message. In addition, the third message may also be an existing message, for example, a request message (Direct_Communicaiton_Request), which may be sent by the eRemote UE, for establishing a Sidelink connection between the eRemote UE and the eRelay UE, that is, the eRemote UE sends a establish sidelink connection to the eRelay UE. When the request message is received, the information contained in the third message described above may be carried in the request message.

402. The first user equipment sends a seventh message to the second user equipment.

After receiving the third message, the first user equipment replies with the seventh message to the second user equipment, when the first identifier used by the first user equipment and the second user equipment determines that the first identifier is the first user equipment identifier. The first user equipment identifier needs to be carried in the seventh message.

In addition, the second user equipment may determine the listening time by nB (the number of subframes included in one paging cycle), the default paging cycle broadcast by the network device, and some information known by the first user equipment, or the first user. The device may also determine the listening time through the resource pool configuration information and some information known by the first user equipment. Correspondingly, the seventh message may carry at least one of nB and a system default paging cycle broadcast by the network device; or

The seventh message may carry resource pool configuration information configured by the network device for transmitting the second message, where the resource pool configuration information includes at least one of the following information:

The resource pool offset SL_offset, SL_offset is used to indicate the information of the resource pool relative to the start position of SFN=0, and the SNF is the radio frame number;

Resource pool period length;

A frequency domain resource location for transmitting the second message.

In addition, the seventh message may further include an offset PO_offset for receiving the second message configured by the first user equipment for the second user equipment, where PO_offset is the first user equipment according to the second user equipment identifier and the paging period. An offset configured for the second user equipment to determine a subframe position at which the second user equipment listens for the second message.

It should be noted that the seventh message may be a newly defined PC5-S message transmitted between the eRemote UE and the eRemote UE. For example, the seventh message can be determined as a Paging Monitoring Reponse. In addition, the seventh message may also be an existing message, for example, a response message (Direct_Communicaiton_Reponse) that may be sent by the eRelay UE to establish a Sidelink connection between the eRemote UE and the eRelay UE, that is, the eRemote UE sends a establish sidelink connection to the eRelay UE. The response message may be carried in the request message carrying the information contained in the seventh message described above.

In another possible implementation, the foregoing seventh message may also be a message periodically broadcast by the second user equipment, where the broadcast message may be a newly defined sidelink between the first user equipment and the second user equipment. The broadcast message sent on the broadcast message may also be an existing one. The first user may receive the broadcast message through the sidelink, and then obtain the information carried in the broadcast message.

In another possible implementation manner, the first user equipment may further obtain, from the network device, the second user equipment identifier, and the UE-specific Paging cycle of the second user equipment, used to determine the monitoring time, where the network side device may Sending a fourth message to the first user equipment, where the fourth message carries the information of the UE-specific Paging cycle of the second user equipment for determining the listening time.

The information for determining the listening time includes at least one of a second user equipment identifier, a system default paging period, and a specific paging period of the second user equipment.

It should be noted that the base station may separately send a fourth message of the UE-specific Paging cycle carrying the eRemote UE to the eRelay UE in the form of a dedicated message, or may be in the paging. The eRemote UE sends the UE-specific Paging cycle of the eRemote UE to the eRelay UE. In this case, the network side device includes the MME and the base station. First, the MME sends a paging message of the UE-specific Paging cycle carrying the eRemote UE to the base station. After receiving the paging message, the base station sends a paging message of the UE-specific Paging cycle of the eRemote UE to the eRelay UE. The fourth message may be the first message described in the embodiment shown in FIG. That is, the first message may also include a specific paging cycle of the second user equipment.

The first user equipment and the second user equipment may determine, according to the information obtained by the first user equipment and the second user equipment, that the second user equipment monitors the second message, in the determining, Before the second user equipment monitors the listening time of the second message, both the first user equipment and the second user equipment need to determine a first identifier for determining the listening time, and a first paging period for determining the first listening time.

The first identifier is the first user equipment identifier or the second user equipment identifier, that is, the device identifier of the eRelay UE or the device identifier of the eRemote UE. The device identifier may be an International Mobile Subscriber Identity (IMSI), an S-TMSI, an IMSI mod 1024 of the user equipment, or other identifiers that may represent the identity of the user equipment.

The first paging cycle may be a specific paging cycle of the second user equipment, or a smaller one of a specific paging cycle of the second user equipment and a system default paging cycle broadcast by the network device, ie, the first paging cycle. It may be the UE-specific Paging cycle of the eRemote UE, or the smaller of the UE-specific Paging cycle of the eRemote UE and the default Paging cycle broadcast by the base station.

It should be noted that the first identifier determined by the first user equipment and the second user equipment is the same, and the first paging period determined by the first user equipment and the second user equipment is also the same, in the first user equipment and the second user. After the device determines the first identifier and the first paging cycle, the listening time can be determined according to the information used to determine the listening time.

The method for determining the listening time is the same as the method for determining the listening time by the first user equipment and the second user equipment. The following uses the first user equipment as an example for description. The following embodiments of the present application provide the following three methods for determining the listening time.

method one:

The first user equipment determines the location of the radio frame and the location of the subframe monitored by the second user equipment in the sidelink according to the first identifier, the first paging cycle, and the nB.

The specific determining method is: first, the first user equipment determines, according to the first identifier, the first paging period, and the nB, the location of the radio frame and the location of the subframe monitored by the second user equipment when listening to the downlink, and then according to the The location of the radio frame and the subframe monitored by the second user equipment when listening to the downlink, and determining the location of the radio frame and the location of the subframe monitored by the second user equipment in the sidelink.

Specifically, the location of the radio frame and the location of the subframe monitored by the eRemote UE when the Uu interface listens to the downlink may be determined according to the following formula.

Formula 1: SFN mod T=(T div N)*(UE_ID mod N)

Equation 2: i_s=floor(UE_ID/N)mod Ns

Where SFN is the location of the subframe; T is the first paging cycle; N is min(T, nB), It indicates the number of radio frames included in a first paging cycle; Ns:max(1, nB/T) is used to indicate the number of subframes included in one radio frame; UE_ID is the first identifier.

The SFN obtained by the above formula 1 can determine the location of the radio frame monitored by the eRemote UE when listening to the downlink. According to Equation 2, i_s can be obtained, and then the eRemote UE can be determined to listen to the downlink according to i_s in combination with Table 1 or Table 2. The position of the sub-frame to be monitored.

For a Frequency Division Duplexing (FDD) system, the possible subframe positions are 0, 4, 5, and 9. The position of the subframe monitored by the eRemote UE when listening to the downlink may be determined according to i_s and Table 1.

Table 1

For a Time Division Duplexing (TDD) system, the possible subframe positions are 0, 1, 5, and 6. The position of the subframe monitored by the eRemote UE when listening to the downlink may be determined according to i_s and Table 2.

Table 2

After determining the location of the radio frame and the location of the subframe monitored by the eRemote UE in the downlink, the eRemote UE can determine the location of the radio frame and the location of the subframe monitored by the eRemote UE, and the determining method includes the following two implementation manners:

Implementation 1: According to the position of the radio frame and the position of the subframe monitored by the configured eRemote UE while listening to the downlink, the eRemote UE determines the correspondence between the location of the radio frame and the location of the subframe monitored by the eRemote UE in the sidelink. The location of the radio frame and the location of the subframe monitored by the sidelink.

For the FDD system, the location of the radio frame and the location of the subframe monitored by the eRemote UE while listening to the downlink are the same as the location of the radio frame monitored by the eRemote UE in the sidelink and the position of the subframe, as shown in FIG. 5, the eRemote UE is in the sidelink. The radio frames to be monitored are the radio frame A and the radio frame X, and the sub-frames to be monitored are the sub-frames represented by the shaded portions in the radio frame A and the radio frame X.

For the TDD system, the location of the radio frame monitored by the eRemote UE while listening to the downlink is the same as the location of the radio frame monitored by the eRemote UE in the sidelink, and the subframe that the eRemote UE listens while listening to the downlink according to different TDD configurations. The location of the subframe is different from the location of the subframe monitored by the eRemote UE in the sidelink. One possible correspondence is shown in Table 3. The Uu PO in Table 3 represents the eRemote UE while listening to the downlink. The position of the monitored sub-frame, The SL PO represents the location of the subframe that the eRemote UE listens on in the sidelink.

table 3

Implementation 2:

For the FDD system, the second user equipment adds a first offset to the subframe position monitored by the second user equipment when the second user equipment listens to the downlink, where the first offset is greater than or equal to 0. Positive integer. The first offset may be configured by the first user equipment, or may be configured by the base station, or may be a preset value.

For example, the radio frame position monitored by the eRemote UE when listening to the downlink is SFN=10, the subframe number is Subfrmae#0, and if the first offset value is 20, the eRemote UEsidelink listens to the radio frame with SFN=30. The subframe whose subframe number is Subfrmae#0.

For the TDD system, after the location of the subframe monitored by the sidelink is the second offset of the subframe monitored by the second user equipment when listening to the downlink, the first one of the resource pools may be used for transmission. The subframe of the second message, the second offset is a positive integer greater than or equal to 0. The second offset may be configured by the first user equipment, or may be configured by the base station, or may be a preset value.

For example, the radio frame position monitored by the eRemote UE when listening to the downlink is SFN=10, the subframe number is Subfrmae#0, and if the second offset value is 25, the eRemote UEsidelink listens to the radio frame with SFN=30. The subframe number is Subfrmae #5.

Method Two:

1. The first user equipment determines, according to the resource pool configuration information, the first identifier, and the first paging cycle, the number N of resource pool periods included in one paging cycle of the second user equipment, and uses in each resource pool period. The number M of subframes in which the second message is sent.

Specifically, according to the period length of the resource pool, the number of resource pool periods included in the paging period of the eRemote UE may be determined, N=the length of the paging period/the period length of the resource pool, and then a homing in the eRemote UE is determined. The number of resource pools in the call cycle is 0, 1, 2...N-1. For example, as shown in FIG. 6, if the resource pool offset is 10 ms, the paging cycle length is 320 ms, and the resource pool cycle length is 20 ms, then N=16, and the resource pool numbers are respectively in the paging cycle. 0, 1, 2...15.

In addition, according to the bitmap included in the configuration information of the resource pool for indicating the subframe in which the second message is transmitted, the number M of subframes used to send the second message in each resource pool period may be determined, thereby determining each resource. The index numbers corresponding to the subframes that can be used to send the second message in the pool cycle are 0, 1, 2, ..., M-1, respectively. For example, if the bitmap of the subframe used for transmitting the second message in one resource pool period is (0010000000, 0000000100), it may be determined that M=2, the index corresponding to the subframe used for transmitting the second message in one resource period. The numbers are 0,1 respectively. As shown in FIG. 6, the subframe for transmitting the second message according to the bitmap is a subframe corresponding to the shaded area, that is, in the resource period 1, there are two subframes for transmitting the second message, the first one. The subframe used for transmitting the second message is the subframe 2 in the first frame, then the index number corresponding to the subframe is 0, and the second subframe used for transmitting the second message is the child in the first frame. Frame 7, then the index number corresponding to the subframe is 1.

2. The first user equipment determines that the second user equipment needs to monitor the resource pool period number of the second message in a first paging period, and the resource pool period number is the first identifier mod N.

Where N is the number of resource pool periods included by the eRemote UE determined in the previous step in one paging cycle.

The first user equipment determines that the second user equipment needs to listen to the index number corresponding to the subframe of the second message in a resource pool period, and the subframe index number is floor (first identifier /N) mod M.

4. The first user equipment determines, according to the resource pool period number determined in step 2 and the subframe index number determined in step 3, the subframe position monitored by the second user equipment in the sidelink.

After determining the resource pool period number and the subframe number, the subframe position corresponding to the subframe number may be determined from the resource pool period corresponding to the resource pool period number, where the subframe position is the second user equipment listening on the sidelink Subframe position.

Method three:

The first user equipment determines a third offset PO_offset according to the first identifier and the first paging cycle, and then the first user equipment according to [frame number *10+subframe number+SL_offset]modulo (first paging cycle)=PO_offset Determining that the second user equipment listens to the frame number and the subframe number of the second message in the sidelink, where SL_offset is the resource pool offset.

It should be noted that in the formula [frame number * 10 + subframe number + SL_offset] modulo (first paging cycle) = PO_offset, SL_offset, the first paging cycle, and the PO_offset are all known, and the frame number satisfying the formula is satisfied. And the subframe number is the frame number and the subframe number of the second user equipment listening to the second message on the sidelink.

Exemplarily, as shown in FIG. 7, if the resource pool period is 20 ms, the resource pool offset is 10 ms, and the bitmap of the uplink subframe position for transmitting the second message in one resource pool period is (0010000000, 0000000000). ). Suppose two eRelay UEs have two connections to them (link) The relationship is either an eRemote UE with a side-link connection established, and the paging periods of the two eRemote UEs are both 320 ms. If the subframe position of the eRemote UE1 allocated to the eRemote UE1 in each paging cycle is the subframe 0 shown in FIG. 7, the subframe position allocated by the eRelay UE to the eRemote UE2 in each paging cycle is as shown in the figure. In subframe 1 shown in Figure 7, the PO_offsets that the eRelay UE needs to configure for the two eRemote UEs are 2 and 22, respectively.

For the embodiment of the present application, the first user equipment and the second user equipment may determine the listening time of the second user equipment to listen to the second message, and then the first user equipment sends the second message during the listening time, and the second user equipment may The second time is received by the second user equipment, so that the second user equipment does not need to listen to the second message on the downlink, and the power consumption is reduced, and the second user equipment does not need to constantly monitor the sidelink, and only needs to wake up at the listening time to receive the second message. The message is fine.

Before the second user equipment sends the second message to the second user equipment, it is not only necessary to determine the listening time of the second user equipment to listen to the second message, but also to determine the resource for sending the second message, in another embodiment of the present invention. In an implementation manner, the method for determining, by the first user equipment, the resource for sending the second message is described in the foregoing step 204.

method 1:

After the first user equipment receives the first message sent by the network device, if it is determined that the first message includes the device identifier of the eRemote UE that has established a sidelink connection with itself, whether the first user equipment is in the RRC_IDLE state or the RRC_CONNECTED state, the first The user equipment determines that the second user equipment monitors the subframe of the second message in the sidelink, and further combines the frequency domain resource location for transmitting the second message included in the resource pool configuration information, in the determined subframe, etc. The frequency domain resource for transmitting the second message is randomly selected in a probabilistic manner.

Method 2:

After the first user equipment receives the first message sent by the network device, if it is determined that the first message includes the device identifier of the eRemote UE that has established a sidelink connection with itself, if the first user equipment is in the RRC_IDLE state, the first user equipment Determining, by the second user equipment, the subframe of the second message in the sidelink, and combining the frequency domain resource location for transmitting the second message included in the resource pool configuration information, and randomly acquiring the subframe in the determined probability Select the frequency domain resource used to transmit the second message.

After the first user equipment receives the first message sent by the network device, if it is determined that the first message includes the device identifier of the eRemote UE that has established a sidelink connection with itself, if the first user equipment is in the RRC_CONNECTED state, the first user equipment Sending a fifth message to the network device, where the fifth message is used to request to obtain the resource for sending the second message, and after receiving the fifth message, the network device returns a sixth message to the first user equipment, where the sixth message includes the network device The resource information or resource pool information allocated by the first user equipment for sending the second message.

The fifth message includes at least one of the following information:

The purpose of the request, the purpose of the request is to indicate that the purpose of the fifth message is to acquire a resource for sending the second message;

The time at which the second message is sent may be the frame number and the subframe number used by the first user equipment to send the second message;

The number of bits contained in the second message;

The number of paging information included in the second message, each second user equipment corresponding to one paging information, each paging information includes a second user equipment identifier and a core network domain information, and the core network domain information is circuit switched. (Circuit Switching, CS) domain or Packet Switching (PS) domain.

Method 3:

If the first user equipment is in the RRC_IDLE state, the network device sends a first message for paging the second user equipment to the first user equipment by means of a broadcast, if it is determined that the first message includes a sidelink connection established with itself. The device identifier of the eRemote UE, the first user equipment determines that the second user equipment monitors the subframe of the second message in the sidelink, and further combines the frequency domain resource location for transmitting the second message included in the resource pool configuration information, and determines the In the subframe, the frequency domain resource for transmitting the second message is randomly selected in an equal probability manner.

If the first user equipment is in the RRC_CONNECTED state, the network device sends the first message for paging the second user equipment to the first user equipment in a manner of a dedicated message, where the first message is further used to transmit the second resource. The frequency domain resource location, and the first user equipment, after determining that the second user equipment listens to the subframe of the second message in the sidelink, may use the frequency domain resource location carried in the first message in the determined subframe. The frequency domain resource to send a second message to the second user equipment.

Method 4:

When the network device needs to send the first message to the first user equipment, if the first user equipment is in the RRC_IDLE state or the ECM_IDLE state, the network side device first sends a paging message to the first user equipment, so that the first user equipment converts Go to the RRC_CONNECTED state ECM_CONNECTED state. After the first user equipment is in the RRC_CONNECTED state or the ECM_CONNECTED state, the network device sends a first message for paging the second user equipment to the first user equipment in the form of a dedicated message, where the first message is further carried for transmission. The frequency domain resource location of the second resource, and the first user equipment, after determining that the second user equipment listens to the subframe of the second message in the sidelink, can use the frequency domain resource carried in the first message in the determined subframe. The frequency domain resource indicated by the location sends a second message to the second user equipment.

Specifically, when the MME needs to send a paging message to the eRemote UE that has a sidelink connection with the eRelay UE by using the eRelay UE, the MME first determines the status of the eRelay UE, and if it is determined that the eRelay UE is in the RRC_IDLE state or ECM_IDLE The MME sends a paging message to the eRelay UE to trigger the eRelay UE to perform state transition. After the MME determines that the eRelay UE enters the ECM_CONNECTED and RRC_CONNECTED states, the MME sends a paging message for paging the eRemote UE to the base station, and then the base station sends a first message for paging the eRemote UE to the eRelay UE by using dedicated signaling, first. The message carries this The device identifier of the eRemote UE and the location of the frequency domain resource used to send the second message. After the eRelay UE determines the listening time of the second message, the eRemote UE can send the second message to the eRemote UE by using the frequency domain resource indicated by the frequency domain resource location carried in the first message.

Method 5:

When the first user equipment receives the first message sent by the network device for paging the eRemote UE, if it is determined that the first message includes the device identifier of the eRemote UE that has established a sidelink connection with itself, and the first user equipment is in the RRC_IDLE In the state, the first user equipment may trigger an RRC connection setup procedure to transition to the RRC_CONNECTED state. After being transferred to the RRC_CONNECTED state, the first user equipment sends a fifth message to the network device, where the fifth message is used to request to obtain the resource for sending the second message, and after receiving the fifth message, the network device returns the first message to the first user equipment. The sixth message includes a resource information or resource pool information allocated by the network device for the first user equipment to send the second message.

The fifth message includes at least one of the following information:

The number of bits contained in the second message;

It can be understood that after the first user equipment and the second user equipment determine the listening time of the second user equipment to listen to the second message, and the first user equipment determines the frequency domain resource used for transmitting the second message, the first The user equipment can transmit a paging message for paging the second user equipment to the second user equipment by using the sidelink. In order to implement the paging message transmission on the sidelink, the embodiment of the present application provides a protocol stack, as shown in the figure. 8 is shown.

The base station can transmit the first message through the Uu interface of the RRC layer, that is, the base station can send the first message to the eRelay through the Paging Control Channel (PCCH) and the Paging Control Channel (PCH) of the air interface. UE.

After the RRC layer of the eRelay UE receives the first message sent by the base station through the Uu interface, if it is determined that the first message includes the device identifier of the eRemote UE that has established a sidelink connection with itself, the RRC layer of the eRelay UE generates the device including the eRemote UE. The second message is identified and the second message is sent to the RLC layer of PC5. Then, in the transparent transmission mode, the RLC layer of the PC5 does not perform any processing on the second message, and directly sends the second message to the PC5 through the defined Stand-Alone Dedicated Control Channel (SPCCH) for transmitting the second message. Medium Access Control (MAC) layer. Still in the MAC layer of PC5 In the transparent transmission mode, the MAC layer of the PC5 does not perform any processing on the second message, and directly sends the second message to the physical layer (PHY) layer of the PC5 through the transport channel SL-PCH for transmitting the second message.

After receiving the second message, the PHY layer of the PC5 of the eRemote UE transmits the second message to the MAC layer of the PC5 through the transport channel SL-PCH for transmitting the second message, and then the MAC layer of the PC5 transmits the message through the SPCCH. Give the RRC layer. If the second message includes the device identifier of the eRemote UE, the RRC layer transmits the device identifier of the eRemote UE to the upper protocol layer.

In a possible implementation manner, the configuration of the protocol stack shown in FIG. 8 can also be implemented as the configuration shown in FIG. 9.

Another embodiment of the present application also provides another protocol stack, as shown in FIG.

The base station may transmit the first message through the Uu interface of the PDCP layer. Specifically, the base station may send a dedicated message to the eRelay UE through the DCCH and the DCH of the air interface: an RRC connection reconfiguration message, and an RRC connection reconfiguration message. Contains the first message.

After the eRelay UE receives the first message, the process of transmitting the message by the subsequent eRelay UE and the eRemote UE is the same as that in the embodiment corresponding to FIG. 8, and details are not described herein again.

In a possible implementation manner, the configuration of the protocol stack shown in FIG. 10 can also be replaced with the configuration shown in FIG.

It should be noted that, in the embodiment of the present application, the second message generated by the first user equipment by using the RRC layer is applicable to any short-distance connection technology, that is, the first user equipment and the second user equipment may not only be transmitted through the sidelink. The second message may also be used to transmit the second message by means of a Wireless Local Area Networks (WLAN) or the like.

The solution provided by the embodiment of the present invention is mainly introduced from the perspectives of the first user equipment and the second user equipment. It can be understood that the first user equipment and the second user equipment comprise corresponding hardware structures and/or software modules for performing the respective functions. Those skilled in the art will readily appreciate that the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The embodiment of the present application may perform the division of the function modules on the first user equipment and the second user equipment according to the foregoing method example. For example, each function module may be divided according to each function, or two or more functions may be integrated in the In a processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and may be further divided in actual implementation.

In the case of dividing the functional modules by using the respective functions, the embodiment of the present application further provides an apparatus for transmitting a paging message, and the apparatus may be implemented as the first user equipment in the foregoing embodiment. As shown in FIG. 12, FIG. 12 is a schematic diagram showing a possible structure of a first user equipment (eRelay UE) involved in the foregoing embodiment. The first user equipment includes: a receiving module 121, which generates The module 122, the determining module 123, the obtaining module 124, the sending module 125, and the converting module 126.

The receiving module 121 is configured to support the first user equipment to receive the first message sent by the network device in step 301 in FIG. 3, and the third message sent by the second user equipment in step 401 in FIG. 4; the generating module 122, The first user equipment is configured to perform step 302 in FIG. 3; the determining module 123 is configured to support the first user equipment to perform step 304 in FIG. 3; and the obtaining module 124 is configured to support the first user equipment to perform the method in FIG. Step 305: The sending module 125 is configured to support the first user equipment to perform step 306 in FIG. 3, and step 402 in FIG. 4; the converting module 126 is configured to support the first user equipment to trigger the RRC establishment process, and switch to the RRC_CONNRECTED state. .

All the related content of the steps involved in the foregoing method embodiments may be referred to the functional description of the corresponding functional modules, and details are not described herein again.

In the case of an integrated unit, it should be noted that the generating module 122, the determining module 123, the obtaining module 124, and the converting module 126 shown in FIG. 12 can be integrated into the processor 1022 shown in FIG. 2 to make the processor 1022. The execution module 122, the determination module 123, the acquisition module 124, and the specific function of the conversion module 126, the receiving module 121 and the sending module 125 can be integrated into the communication interface 1021 shown in FIG. 2, so that the communication interface 1021 executes the receiving module 121 and transmits The specific function of module 125.

In the case of dividing each function module by using the corresponding function, the embodiment of the present application further provides another device for transmitting a paging message, and the device may be implemented as the second user equipment in the foregoing embodiment. As shown in FIG. 13, FIG. 13 is a schematic diagram showing a possible structure of a second user equipment (eRemote UE) involved in the foregoing embodiment. The second user equipment includes: a determining module 131, a listening module 132, a sending module 133, and a receiving module 134.

The determining module 131 is configured to support the second user equipment to perform step 305 in FIG. 3; the listening module 132 is configured to support the second user equipment to perform step 307 in FIG. 3; and the sending module 133 is configured to support the second user. The device performs step 401 in FIG. 4; the receiving module 134 is configured to support the second user equipment to perform the second message sent by the first user equipment in step 306 in FIG. 3, and the seventh message sent by the first user equipment in FIG. .

In the case of an integrated unit, it should be noted that the determining module 131 shown in FIG. 13 can be integrated into the processor 1032 shown in FIG. 2, so that the processor 1032 executes the determining module 131, and the listening module 132. The specific function, the sending module 133, the receiving module 134 can be integrated in the communication interface 1031 shown in FIG. 2, so that the communication interface 1031 executes the sending module 133, and receives the specific function of the module 134.

The embodiment of the present application further provides a data transmission system, which may include the first user equipment, the second user equipment, and the network equipment described in any of the foregoing embodiments.

Embodiments of the present application also provide a computer storage medium for storing computer software instructions for use by the first user device, including a program designed to perform the steps performed by the first user device in the above embodiments.

The application example provides a computer storage medium for storing computer software instructions used by the second user equipment, which includes steps for executing the first user equipment in the foregoing embodiment. The procedure designed.

The steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions. The software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device. Of course, the processor and the storage medium may also exist as discrete components in the core network interface device.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network devices. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each functional unit may exist independently, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, by hardware, but in many cases, the former is a better implementation. . Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer. A hard disk or optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present application.

The above is only the specific embodiment of the present application, but the scope of the present application is not limited thereto, and variations or alternatives within the technical scope of the present application should be covered by the scope of the present application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A method for transmitting a paging message, comprising:

The first user equipment receives the first message sent by the network device, where the first message is used to page the second user equipment, and the first message includes at least the paging information of the second user equipment;

The first user equipment generates a second message according to the first message, where the second message is used to page the second user equipment, and the second message includes paging information of the second user equipment;

Determining, by the first user equipment, a listening time of the second user equipment to listen to the second message;

The first user equipment acquires a resource for sending the second message;

The first user equipment sends the second message to the second user equipment by using the resource for sending the second message at the listening time.
The method of transmitting a paging message according to claim 1, wherein the method further comprises:

The first user equipment receives a third message sent by the second user equipment, where the third message carries information for determining the listening time; or

The first user equipment receives a fourth message sent by the network device, where the fourth message carries information for determining the listening time.
The method for transmitting a paging message according to claim 2, wherein the information for determining the listening time comprises a second user equipment identifier, a specific paging period of the second user equipment, and a system default At least one of the paging cycles.
The method of transmitting a paging message according to claim 3, wherein the method further comprises:

Determining, by the first user equipment, a first identifier that is used to determine the listening time, where the first identifier is a first user equipment identifier or the second user equipment identifier;

Determining, by the first user equipment, a first paging cycle for determining the listening time, the first paging cycle being the specific paging cycle, or the default paging cycle and the system default seeking The smaller of the call cycles.
The method of transmitting a paging message according to any one of claims 2 to 4, wherein the method further comprises:

The first user equipment receives resource pool configuration information configured by the network device for transmitting the second message, where the resource pool configuration information includes at least one of the following information:

Resource pool offset;

Resource pool period length;

a bitmap bitmap for indicating a subframe in which the second message is transmitted;

A frequency domain resource location for transmitting the second message.
The method for transmitting a paging message according to claim 4, wherein the determining, by the first user equipment, the monitoring time of the second user equipment to listen to the second message comprises:

Determining, by the first user equipment, the location of the radio frame and the location of the subframe monitored by the second user equipment in the sidelink sidelink according to the first identifier, the first paging period, and nB, where the nB is The number of subframes included in a paging cycle.
The method for transmitting a paging message according to claim 6, wherein the first user equipment determines that the second user equipment is on the side according to the first identifier, the first paging cycle, and nB The location of the radio frame and the location of the subframe monitored by the link sidelink, including:

Determining, by the first user equipment, the location of the radio frame and the location of the subframe that the second user equipment listens to when listening to the downlink according to the first identifier, the first paging cycle, and the nB;

Determining, by the first user equipment, the location of the radio frame and the location of the subframe monitored by the second user equipment in the sidelink sidelink according to the location of the radio frame and the subframe monitored by the second user equipment when listening to the downlink .
A method of transmitting a paging message according to claim 7, wherein

The second user equipment adds a first offset to the subframe position monitored by the second user equipment when the second user equipment listens to the downlink, where the first offset is greater than or equal to 0. Positive integer; or,

The first user equipment may transmit the first one of the resource pools after the location of the subframe monitored by the sidelink is the location of the subframe that is monitored when the second user equipment listens to the downlink, and the second offset is added. The subframe of the second message, the second offset is a positive integer greater than or equal to 0.
The method for transmitting a paging message according to claim 5, wherein the determining, by the first user equipment, the monitoring time of the second user equipment to listen to the second message comprises:

Determining, by the first user equipment, the number of resource pool periods included in a first paging cycle of the second user equipment, according to the resource pool configuration information, the first identifier, and the first paging cycle. And the number of subframes M used to transmit the second message in each resource pool period;

The first user equipment determines that the second user equipment needs to listen to the resource pool period number of the second message in a first paging period, where the resource pool period number is the first identifier modN;

The first user equipment determines that the second user equipment needs to listen to the subframe number of the second message in a resource pool period, and the subframe number is floor (first identifier /N) mod M;

The first user equipment determines, according to the resource pool period number and the subframe number, a subframe position that the second user equipment listens on the sidelink.
The method for transmitting a paging message according to claim 5, wherein the determining, by the first user equipment, the monitoring time of the second user equipment to listen to the second message comprises:

Determining, by the first user equipment, a third offset PO_offset according to the first identifier and the first paging cycle;

Determining, by the first user equipment, that the second user equipment listens to the frame number and the subframe number of the second message in the sidelink according to the [frame number *10+subframe number+SL_offset] modulo (first paging period)=PO_offset Where SL_offset is the resource pool offset.
The method for transmitting a paging message according to claim 1, wherein if the first user equipment is in an RRC_IDLE state, after the first user equipment receives the first message sent by the network device, the method Also includes:

The first user equipment triggers an RRC connection establishment procedure and transitions to an RRC_CONNRECTED state.
The method for transmitting a paging message according to any one of claims 1 to 11, wherein the acquiring, by the first user equipment, the resource for sending the second message comprises:

The first user equipment sends a fifth message to the network device, where the fifth message is used to request to acquire a resource for sending the second message;

The first user equipment receives a sixth message sent by the network device, where the sixth message includes resource information or a resource pool allocated by the network device for the first user equipment to send the second message. information.
The method of transmitting a paging message according to claim 12, wherein the fifth message comprises at least one of the following information:

The purpose of the request is to indicate that the purpose of the fifth message is to acquire a resource for sending the second message;

The time at which the second message is sent;

The number of paging information included in the second message, and each second user equipment corresponds to one paging information;

The number of bits included in the second message.
The method for transmitting a paging message according to any one of claims 1 to 11, wherein the acquiring, by the first user equipment, the resource for sending the second message comprises:

The first user equipment acquires a resource for sending the second message from the first message, where the first message includes the network device that is allocated by the first user equipment for sending the Resource information or resource pool information of the second message.
The method for transmitting a paging message according to any one of claims 1 to 14, wherein the first user equipment receives a first message sent by a network device; the first user equipment is according to the first The message generates the second message, including:

The radio resource control layer of the first user equipment receives the first message, and generates the second message according to the first message.
A method for transmitting a paging message, comprising:

The second user equipment determines the listening time of the second user equipment, where the second message is used to page the second user equipment, and the second message includes paging information of the second user equipment;

The second user equipment monitors the second message sent by the first user equipment during the listening time;

The second user equipment receives the second message when the second message is heard.
The method of transmitting a paging message according to claim 16, wherein the method further comprises:

The second user equipment sends a third message to the first user equipment, where the third message carries a specific paging period of the second user equipment;

The second user equipment receives the seventh message sent by the first user equipment, where the seventh message carries information for determining the listening time.
The method for transmitting a paging message according to claim 17, wherein the information for determining the listening time comprises a first user equipment identifier, nB, and a system for broadcasting a network device. At least one of a default paging cycle, the nB being the number of subframes included in one paging cycle; or

The information for determining the listening time is resource pool configuration information configured by the network device for transmitting a second message, where the resource pool configuration information includes at least one of the following information:

Resource pool offset;

Resource pool period length;

a bitmap bitmap for indicating a subframe in which the second message is transmitted;

A frequency domain resource location for transmitting the second message.
The method of transmitting a paging message according to claim 18, wherein the method further comprises:

Determining, by the second user equipment, a first identifier that is used to determine the listening time, where the first identifier is the first user equipment identifier or the second user equipment identifier;

Determining, by the second user equipment, a first paging cycle for determining the listening time, the first paging cycle is the specific paging cycle, or the specific paging cycle and the system default seeking The smaller of the call cycles.
The method for transmitting a paging message according to claim 19, wherein the second user equipment determines to monitor the listening time of the second message, including:

Determining, by the second user equipment, a location of the subframe monitored by the second user equipment in the sidelink sidelink according to the first identifier, the first paging period, and the nB.
The method for transmitting a paging message according to claim 20, wherein the second user equipment determines that the second user equipment is in accordance with the first identifier, the first paging cycle, and the nB The location of the subframe monitored by the sidelink sidelink, including:

Determining, by the second user equipment, the location of the radio frame and the location of the subframe monitored by the second user equipment when listening to the downlink according to the first identifier, the first paging period, and the nB;

The second user equipment determines the location of the subframe monitored by the second user equipment in the sidelink according to the location of the radio frame and the subframe monitored by the second user equipment when listening to the downlink.
A method of transmitting a paging message according to claim 21, wherein

The second user equipment adds a first offset to the subframe position monitored by the second user equipment when the second user equipment listens to the downlink, where the first offset is greater than or equal to 0. Positive integer; or,

The first user equipment may transmit the first one of the resource pools after the location of the subframe monitored by the sidelink is the location of the subframe that is monitored when the second user equipment listens to the downlink, and the second offset is added. The subframe of the second message, the second offset is a positive integer greater than or equal to 0.
The method for transmitting a paging message according to claim 19, wherein the second user equipment determines to monitor the listening time of the second message, including:

Determining, by the second user equipment, the number of resource pool periods included in a first paging cycle of the second user equipment, according to the resource pool configuration information, the first identifier, and the first paging cycle. And the number of subframes M used to transmit the second message in each resource pool period;

Determining, by the second user equipment, that the second user equipment needs to be monitored in a first paging cycle Listening to the resource pool period number of the second message, where the resource pool period number is the first identifier modN;

The second user equipment determines that the second user equipment needs to listen to the subframe number of the second message in a resource pool period, and the subframe number is floor (first identifier /N) mod M;

The second user equipment determines, according to the resource pool period number and the subframe number, a subframe position that the second user equipment listens on the sidelink.
The method for transmitting a paging message according to claim 19, wherein the second user equipment determines to monitor the listening time of the second message, including:

Determining, by the second user equipment, a third offset PO_offset according to the first identifier and the first paging cycle;

Determining, by the second user equipment, that the second user equipment listens to the frame number and the subframe number of the second message in the sidelink according to the [frame number *10+subframe number+SL_offset] modulo (first paging period)=PO_offset Where SL_offset is the resource pool offset.
An apparatus for transmitting a paging message, wherein the apparatus is applied to a first user equipment, the apparatus comprising:

a memory for storing information including program instructions;

a communication interface, configured to receive a first message sent by the network device, where the first message is used to page the second user equipment, and the first message includes at least paging information of the second user equipment;

a processor, coupled to the memory and the communication interface, for controlling execution of program instructions, specifically for generating a second message according to the first message received by the communication interface, where the second message is used Paging a second user equipment, where the second message includes paging information of the second user equipment; determining a listening time of the second user equipment to listen to the second message;

The processor is further configured to control, by the communications interface, a resource for sending the second message;

The processor is further configured to control, by the communication interface, to send the second message generated by the processor to the second user equipment by using a resource for sending the second message at the listening time. .
The apparatus for transmitting a paging message according to claim 25, wherein

The communication interface is further configured to receive a third message sent by the second user equipment, where the third message carries information for determining the listening time; or receives a fourth message sent by the network device The fourth message carries information for determining the listening time. The information for determining the listening time includes the second user equipment identifier, and the specific paging of the second user equipment. Cycle, at least one of the system default paging cycles.
The apparatus for transmitting a paging message according to claim 26, wherein

The processor is further configured to determine a first identifier used to determine the listening time, where the first identifier is a first user equipment identifier or the second user equipment identifier; and determining to determine the listening time The first paging cycle, the first paging cycle is the specific paging cycle, or the smaller one of the specific paging cycle and the system default paging cycle.
Apparatus for transmitting a paging message according to any one of claims 25 to 27, characterized in that

The communication interface is further configured to receive, by the network device, for transmitting the second message Resource pool configuration information, where the resource pool configuration information includes at least one of the following information:

Resource pool offset;

Resource pool period length;

a bitmap bitmap for indicating a subframe in which the second message is transmitted;

A frequency domain resource location for transmitting the second message.
The apparatus for transmitting a paging message according to claim 27, wherein

The processor is further configured to determine, according to the first identifier, the first paging period, and nB, a location of a radio frame and a location of a subframe monitored by the second user equipment in a sidelink sidelink, nB is the number of subframes included in one paging cycle.
The apparatus for transmitting a paging message according to claim 29, wherein

The processor is configured to determine, according to the first identifier, the first paging period, and the nB, a location of a radio frame and a location of a subframe that are monitored by the second user equipment when listening to the downlink; Determining, by the second user equipment, the location of the radio frame and the subframe that is monitored during the downlink, and determining the location of the radio frame and the location of the subframe monitored by the second user equipment in the sidelink sidelink;

The second user equipment adds a first offset to the subframe position monitored by the second user equipment when the second user equipment listens to the downlink, where the first offset is greater than or equal to 0. Positive integer; or,

The first user equipment may transmit the first one of the resource pools after the location of the subframe monitored by the sidelink is the location of the subframe that is monitored when the second user equipment listens to the downlink, and the second offset is added. The subframe of the second message, the second offset is a positive integer greater than or equal to 0.
The apparatus for transmitting a paging message according to claim 28, characterized in that

The processor is further configured to determine, according to the resource pool configuration information, the first identifier, and the first paging period, a resource pool period included in a first paging cycle of the second user equipment. a quantity N, and a number M of subframes used to send the second message in each resource pool period; determining that the second user equipment needs to listen to resources of the second message in a first paging period a pool cycle number, the resource pool cycle number being the first identifier mod N; determining, in a resource pool period, the second user equipment needs to monitor a subframe number of the second message, the subframe number a floor (first identifier /N) mod M; determining, according to the resource pool period number and the subframe number, a subframe position that the second user equipment listens on the sidelink.
The apparatus for transmitting a paging message according to claim 28, characterized in that

The processor is further configured to determine a third offset PO_offset according to the first identifier and the first paging cycle; according to [frame number *10+subframe number+SL_offset]modulo (first paging cycle) = PO_offset determines that the second user equipment listens to the frame number and the subframe number of the second message on the sidelink, wherein SL_offset is the resource pool offset.
The apparatus for transmitting a paging message according to claim 25, wherein

The processor is further configured to trigger an RRC connection establishment process and switch to an RRC_CONNRECTED state.
Apparatus for transmitting a paging message according to any one of claims 25 to 33, characterized in that

The communication interface is further configured to send a fifth message to the network device, where the fifth message is used to request to acquire a resource for sending the second message, and receive a sixth message sent by the network device, where the The six message includes resource information or resource pool information that is allocated by the network device to the first user equipment for sending the second message;

The fifth message includes at least one of the following information:

The purpose of the request is to indicate that the purpose of the fifth message is to acquire a resource for sending the second message;

The time at which the second message is sent;

The number of paging information included in the second message, and each second user equipment corresponds to one paging information;

The number of bits included in the second message.
Apparatus for transmitting a paging message according to any one of claims 25 to 33, characterized in that

The communication interface is further configured to: acquire, by the first message, a resource for sending the second message, where the first message includes, by the network device, the first user equipment, for sending Resource information or resource pool information of the second message.
Apparatus for transmitting a paging message according to any one of claims 25 to 35, characterized in that

The communication interface is further configured to receive the first message by using a radio resource control layer;

The processor is further configured to generate the second message by using a radio resource control layer according to the first message.
An apparatus for transmitting a paging message, wherein the apparatus is applied to a second user equipment, the apparatus comprising:

a memory for storing information including program instructions;

a processor, coupled to the memory and the communication interface, for controlling execution of the program instruction, specifically for determining a listening time for monitoring the second message, wherein the second message is used for paging the second user equipment, where The second message includes paging information of the second user equipment;

The processor is further configured to control the communication interface to listen to the second message sent by the first user equipment during the listening time; and when the second message is heard, receive the second message.
The apparatus for transmitting a paging message according to claim 37, wherein:

The communication interface is configured to send a third message to the first user equipment, where the third message carries a specific paging cycle of the second user equipment, and receives a seventh message sent by the first user equipment The seventh message carries information for determining the listening time;

The information for determining the listening time includes at least one of a first user equipment identifier, nB, and a system default paging period broadcast by the network device, where the nB is the number of subframes included in one paging period. ;or,

The information for determining the listening time is resource pool configuration information configured by the network device for transmitting a second message, where the resource pool configuration information includes at least one of the following information:

Resource pool offset;

Resource pool period length;

a bitmap bitmap for indicating a subframe in which the second message is transmitted;

A frequency domain resource location for transmitting the second message.
The apparatus for transmitting a paging message according to claim 38, wherein:

The processor is further configured to determine a first identifier used to determine the listening time, where the first identifier is the first user equipment identifier or the second user equipment identifier; and determining to determine the monitoring a first paging cycle of time, the first paging cycle being the particular paging cycle, or the smaller of the specific paging cycle and the system default paging cycle.
The apparatus for transmitting a paging message according to claim 39, wherein:

The processor is further configured to determine, according to the first identifier, the first paging period, and the nB, a location of a subframe that the second user equipment listens on a sidelink sidelink.
The apparatus for transmitting a paging message according to claim 40, wherein:

The processor is configured to determine, according to the first identifier, the first paging period, and the nB, a location of a radio frame and a location of a subframe that are monitored by the second user equipment when listening to the downlink; Determining, by the second user equipment, the location of the radio frame and the subframe that is monitored during the downlink, and determining the location of the subframe that the second user equipment is listening to in the sidelink;

The second user equipment adds a first offset to the subframe position monitored by the second user equipment when the second user equipment listens to the downlink, where the first offset is greater than or equal to a positive integer of 0; or,

The first user equipment may transmit the first one of the resource pools after the location of the subframe monitored by the sidelink is the location of the subframe that is monitored when the second user equipment listens to the downlink, and the second offset is added. The subframe of the second message, the second offset is a positive integer greater than or equal to 0.
The apparatus for transmitting a paging message according to claim 39, wherein:

The processor is further configured to determine, according to the resource pool configuration information, the first identifier, and the first paging period, a resource pool period included in a first paging cycle of the second user equipment. a quantity N, and a number M of subframes used to send the second message in each resource pool period; determining that the second user equipment needs to listen to resources of the second message in a first paging period a pool cycle number, the resource pool cycle number being the first identifier mod N; determining, in a resource pool period, the second user equipment needs to monitor a subframe number of the second message, the subframe number a floor (first identifier /N) mod M; determining, according to the resource pool period number and the subframe number, a subframe position that the second user equipment listens on the sidelink.
The apparatus for transmitting a paging message according to claim 39, wherein:

The processor is further configured to determine a third offset PO_offset according to the first identifier and the first paging cycle; according to [frame number *10+subframe number+SL_offset]modulo (first paging cycle) = PO_offset determines that the second user equipment listens to the frame number and the subframe number of the second message on the sidelink, wherein SL_offset is the resource pool offset.