CN109392050B

CN109392050B - Method and equipment for acquiring identification information of tracking area of target serving cell

Info

Publication number: CN109392050B
Application number: CN201710875251.8A
Authority: CN
Inventors: 杜振国; 丁志明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-08-10
Filing date: 2017-09-25
Publication date: 2020-07-07
Anticipated expiration: 2037-09-25
Also published as: CN109392050A

Abstract

A method and equipment for acquiring identification information of a tracking area of a target serving cell are used for reducing power consumption of terminal equipment. The method for acquiring the Tracking Area Identity (TAI) of the cell reselection target serving cell comprises the following steps: the method comprises the steps that terminal equipment obtains a synchronization frame sent by network equipment which receives a target service cell through a wake-up radio frequency WUR interface, wherein the synchronization frame comprises identification information of a TA (timing advance) to which the target service cell belongs, and the target service cell is the service cell in which the terminal equipment is located after cell reselection; the terminal equipment acquires the identification information of the TA to which the target serving cell belongs from the synchronous frame; and the terminal equipment determines whether TA updating is needed according to the identification information of the TA to which the target service cell belongs, and keeps a main communication interface of the terminal equipment in a closed state when the TA updating is not needed.

Description

Method and equipment for acquiring identification information of tracking area of target serving cell

This application claims priority from chinese patent office filed on 10/8/2017, entitled "data transmission method and apparatus," application No. 201710682675.2, which is incorporated herein by reference in its entirety.

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and a device for obtaining identification information of a tracking area of a target serving cell.

Background

In a conventional mobile communication system, such as a Long Term Evolution (LTE) system, when a terminal device in an IDLE (IDLE) state needs to perform cell reselection during a moving process, cell reference signals of a current serving cell and other neighboring serving cells are measured, and whether to start a cell reselection process is determined based on a measurement result.

After the terminal device determines the target serving cell from other neighboring serving cells, that is, after completing cell reselection, the terminal device receives a System information block 1(System information block1, SIB1) of the target serving cell through the primary communication interface, acquires a Tracking Area Identity (TAI) of the target serving cell from the SIB1, and determines whether to perform Tracking Area (TA) update according to the TAI of the target serving cell.

Based on the above description of the cell reselection process, after the terminal device performs cell reselection during the moving process, it needs to receive the system message block1 of the target serving cell through the primary communication interface to obtain the TAI of the target serving cell and determine whether TA update is needed, and the system message block1 of the target serving cell received through the primary communication interface already adopts a relatively complex modulation and channel coding manner, such as Orthogonal Frequency Division Multiplexing (OFDM) modulation, Turbo, Low Density Parity Check (LDPC), or Polar, on the network device side, so that after receiving the system message block1, the terminal device needs to perform complex signal processing operations such as Fast Fourier Transform (FFT), Forward Error Correction (Forward Error Correction, FEC), and when the terminal device does not need to perform TA update, it needs to obtain a large amount of energy consumption TAI of the target serving cell through these complex signal processing operations, the power consumption of the terminal device is increased.

Disclosure of Invention

The embodiment of the application provides a method and equipment for acquiring identification information of a tracking area of a target serving cell, which are used for reducing the power consumption of terminal equipment.

In a first aspect, an embodiment of the present application provides a method for obtaining identification information of a tracking area TA of a cell reselection target serving cell, where the method includes: the method comprises the steps that a network device generates a synchronous frame, wherein the synchronous frame comprises identification information of a tracking area TA to which a cell where the network device is located belongs; the network device sends the synchronization frame; after the terminal equipment reselects a target service cell, acquiring a synchronization frame sent by network equipment of the target service cell and received through a wake-up radio frequency WUR interface; and the terminal equipment acquires the identification information of the TA to which the target serving cell belongs from the synchronization frame, determines whether TA updating is required or not according to the identification information of the TA to which the target serving cell belongs, and keeps a main communication interface of the terminal equipment in a closed state when the TA updating is not required. Through the scheme provided by the embodiment of the application, the situation that TA updating is not needed when the terminal equipment receives the TAI of the TA to which the system message belongs through the main communication interface is avoided, the main communication interface of the terminal equipment is in a closed state, and complex signal processing operations such as Fast Fourier Transform (FFT), Forward Error Correction (FEC) and the like are also avoided being performed on the signal received through the main communication interface, so that the power consumption of the terminal equipment can be reduced.

In one possible design, the network device transmits the synchronization frame according to a preset period. The preset period may be configured by the network device or may be specified by a standard protocol.

In a possible design, the synchronization frame further includes duration information of the preset period. Therefore, when the WUR interface of the terminal equipment is activated at a certain time interval, the terminal equipment can predict the reaching time of a subsequent synchronization frame after receiving the first synchronization frame of the target service cell, further can accurately adjust the time when the WUR interface is in an activated state and the time length when the WUR interface is in the activated state, and can accurately receive the subsequent synchronization frame of the target service cell and simultaneously reduce the power consumption of the terminal equipment.

In one possible design, the synchronization frame further includes cell identification information of a cell in which the network device is located. After the terminal device reselects a target serving cell, the identification information of the target serving cell can be obtained without performing complex analysis operation on the received synchronous frame, so that the power consumption of the terminal device can be reduced. The Cell identification information may be a Physical-layer Cell Identity (PCI), or a part of information in the PCI, or indication information for indicating the PCI, and after the terminal device obtains the indication information, the PCI indicated by the indication information may be determined according to a corresponding relationship between the indication information and the PCI.

In one possible design, the terminal device may receive, through the WUR interface, a synchronization frame sent by each network device of N network devices of N candidate serving cells, and then measure a first synchronization frame sent by each network device, to obtain N measurement results; and determining a target service cell from the N candidate service cells according to the N measurement results, and recording the target service cell as a current service cell. According to the scheme provided by the embodiment of the application, when the terminal equipment reselects one target serving cell in the N candidate serving cells, the terminal equipment can directly obtain the identification information of the TA to which the target serving cell belongs from the synchronization frame sent by the network equipment of the target serving cell, and further determine the TAI of the TA to which the target serving cell belongs according to the identification information of the TA to which the target serving cell belongs, so that the steps that the terminal equipment needs to receive the system message of the target serving cell through a main communication interface after cell reselection and perform complex analysis on the system message are omitted, and the power consumption of the terminal equipment can be further reduced. Of course, the terminal device may also determine the target serving cell according to other manners, for example, measure reference signals of N serving cells in which the N network devices are located, perform cell reselection according to the obtained measurement result, and receive the synchronization frame sent by the network device of the target serving cell after determining the target serving cell.

In one possible design, the WUR interface corresponds to a wakeup window determined by the terminal device in a source serving cell of a source network device, the wakeup window is a time window in which the WUR interface is in an active state, and the window duration of the wakeup window is a first window duration; the terminal equipment receives the synchronous frames respectively sent by each network equipment in the N network equipment through the WUR interface within the first window duration; or the terminal device receives a first synchronization frame sent by each network device in the N network devices through the WUR interface within a first time length of the WUR interface in the activated state, and after the target service cell is determined, adjusts the time length of the WUR interface in the activated state to be a second time length according to the time when the network device receiving the target service cell sends the first synchronization frame, and receives a subsequent synchronization frame sent by the network device of the target service cell through the WUR interface within the second time length, wherein the first time length is longer than the first window time length, and the second time length is shorter than the first time length; or the terminal device receives a first synchronization frame sent by each network device in the N network devices through the WUR interface within a third duration that the WUR interface is in the activated state; after the target serving cell is determined, adjusting the time length of the WUR interface in the activated state to be a fourth time length according to the time of receiving a first synchronization frame sent by the network equipment of the target serving cell or the time of receiving the first synchronization frame sent by the network equipment of the target serving cell and the time of receiving a second synchronization frame sent by the network equipment of the target serving cell, and receiving a subsequent synchronization frame sent by the network equipment of the target serving cell through the WUR interface within the fourth time length, wherein the third time length is greater than the first window time length, and the fourth time length is less than the third time length; or the terminal device receives a first synchronization frame sent by each network device in the N network devices through the WUR interface within a fifth time length when the WUR interface is in the activated state; and after the target serving cell is determined, according to the time of receiving a first synchronization frame sent by the network equipment of the target serving cell and the period of sending the synchronization frame by the network equipment of the target serving cell included in the first synchronization frame, adjusting the time length of the WUR interface in the activated state to be a sixth time length, and receiving a subsequent synchronization frame sent by the network equipment of the target serving cell through the WUR interface in the sixth time length, wherein the fifth time length is greater than the first window time length, and the sixth time length is less than the fifth time length.

In this embodiment of the present application, a period of a synchronization frame sent by each of N network devices of N candidate serving cells may be the same as or different from a period of a synchronization frame sent by a source network device, a start time of a synchronization frame sent by each of the N network devices may be the same as or different from a start time of a synchronization frame sent by the source network device, for example, a period of a synchronization frame sent by each of the N network devices is the same as a period of a synchronization frame sent by the source network device, and an interval between the start times is smaller than a first window duration; or, the period of the synchronization frame sent by each network device in the N network devices is the same as the period of the synchronization frame sent by the source network device, and the interval between the starting time of the synchronization frame sent by at least one network device in the N network devices and the starting time of the synchronization frame sent by the source network device is greater than the first window duration of the terminal device; or, the period of the synchronization frame transmitted by at least one network device of the N network devices is different from the period of the synchronization frame transmitted by the source network device. There are other situations, which are not listed here.

In this embodiment of the present application, the WUR interface of the terminal device may be continuously in an active state, in this case, no matter how the N network devices transmit the synchronization frame, the terminal device can receive through the WUR interface within the first window duration, and when the WUR interface of the terminal device is activated at a certain time interval, the terminal device needs to receive in different receiving manners for different transmission manners of the N network devices.

For example, the period of the synchronization frame sent by each of the N network devices is the same as the period of the synchronization frame sent by the source network device, the interval between the start times is smaller than the first window duration, and the terminal device can receive the synchronization frame sent by each of the N network devices through the WUR interface within the first window duration.

The period of each network device in the N network devices respectively sending the synchronous frame is the same as the period of the source network device sending the synchronous frame, the interval between the starting time of at least one network device in the N network devices sending the synchronous frame and the starting time of the source network device sending the synchronous frame is larger than the first window time length, the terminal device may not receive the synchronous frame sent by each network device in the N network devices in the first window time length, at this time, the terminal device can control the time length of the WUR interface in the activated state to be the first time length which is larger than the first window time length, so as to receive the first synchronous frame respectively sent by each network device in the N network devices through the WUR interface in the first time length, determine the target service cell from the N candidate service cells and then according to the time of receiving the first synchronous frame sent by the network device of the target service cell, and adjusting the starting time of the WUR interface in the activated state and the time length of the WUR interface in the activated state to be a second time length, and receiving a subsequent synchronization frame sent by the network equipment of the target service cell through the WUR interface in the second time length. The WUR window is activated only when the subsequent synchronization frame reaches the time, and the second time length of the WUR window in the activated state is less than the first time length, so that the technical scheme provided by the embodiment of the application can accurately receive the subsequent synchronization frame sent by the network equipment of the target service cell and simultaneously reduce the power consumption of the terminal equipment.

At least one of the N network devices has a period for sending the synchronization frame different from a period for sending the synchronization frame by the source network device, the terminal device may not be able to receive the synchronization frame sent by each of the N network devices within a first window duration, at this time, the terminal device may control a duration of the active state of the WUR interface to be a third duration, which is greater than the first window duration, to receive the first synchronization frame sent by each of the N network devices through the WUR interface within the third duration, and after the target serving cell is determined from the N candidate serving cells, adjust a start time of the active state of the WUR interface and a duration of the active state to be a fourth duration according to a time of receiving the first synchronization frame sent by the network device of the target serving cell or according to a time of receiving the first synchronization frame and the second synchronization frame of the target serving cell, and receiving a subsequent synchronization frame transmitted by the network equipment of the target serving cell through the WUR interface within a fourth time length. In this way, if the synchronization frame sent by each network device in the N network devices further includes the period information of the synchronization frame sent by the network device, the terminal device may dynamically adjust the start time of the WUR interface in the active state and the duration of the WUR interface in the active state according to the time of sending the first synchronization frame by the network device of the receiving target serving cell, so as to reduce the power consumption of the terminal device while ensuring that the network device of the receiving target serving cell can accurately receive the subsequent synchronization frame sent by the network device of the receiving target serving cell.

In a possible design, the terminal device determines whether the TAI indicated by the identification information of the TA to which the target serving cell belongs is in a TA list stored by the terminal device, and if it is determined that the TAI indicated by the identification information of the TA to which the target serving cell belongs is in the TA list, the terminal device may keep the primary communication interface in a closed state. In this way, the terminal device activates the primary communication interface only when the TAI indicated by the identification information of the TA to which the target serving cell belongs is not in the TA list, so as to perform TA update with the network device through the primary communication interface, and when the TAI indicated by the identification information of the TA to which the target serving cell belongs is in the TA list, the terminal device may keep the primary communication interface in a closed state, so as to reduce power consumption of the terminal device.

In a second aspect, an embodiment of the present application provides a terminal device, where the terminal device has a function of implementing a behavior of the terminal device in the method in the first aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.

In one possible design, the terminal device includes a wake radio frequency WUR interface and a processor in a structure, and the processor is configured to support the terminal device to perform corresponding functions in the method of the first aspect. The WUR interface is configured to support communication between a terminal device and a network device, and to receive information or instructions related to the method of the first aspect. The terminal device may also include a memory coupled to the processor that retains the necessary program instructions and data. The terminal device may further comprise a primary communication interface for supporting communication between the terminal device and the network device.

In a third aspect, an embodiment of the present application provides a network device, where the network device has a function of implementing a behavior of the network device in the method in the first aspect. The functions may be implemented in hardware, and the network device may be configured to include a processor and a transmitter. The corresponding software implementation may also be performed by hardware. The hardware or software comprises one or more modules corresponding to the functions. The modules may be software and/or hardware.

In a fourth aspect, an embodiment of the present application provides a communication system, where the communication system includes the terminal device in the second aspect and the network device in the third aspect.

In a fifth aspect, an embodiment of the present application provides a computer storage medium, which stores computer software instructions for executing the functions of any one of the designs of the first aspect and the first aspect, or contains a program for executing the method of any one of the designs of the first aspect and the first aspect.

In a sixth aspect, the present application provides a computer program product, which when being invoked by a computer, can cause the computer to execute the method of any one of the first aspect and the first aspect.

In a seventh aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor, and is configured to support a terminal device or a network device to implement the method according to the first aspect, for example, to generate or process data and/or information involved in the method according to the first aspect. In one possible design, the system-on-chip further includes a memory for storing necessary program instructions and data of the terminal device or the network device, and the processor in the system-on-chip may call the program instructions and data stored in the memory in the system-on-chip to enable the system-on-chip to implement the functions of the terminal device or the network device. The chip system may be formed by a chip, or may include a chip and other discrete devices.

In an eighth aspect, an embodiment of the present application provides a data transmission method, where the method is applied to a network device and at least one terminal device, where the network device includes a first interface and a second interface, the terminal device includes a third interface and a fourth interface, the first interface and the third interface communicate through a first communication method, and the second interface and the fourth interface communicate through a second communication method;

the method comprises the following steps:

the network equipment generates a synchronous frame, wherein the synchronous frame comprises TA identification information of a tracking area TA to which the network equipment belongs;

the network device sends the synchronization frame to the third interface of the at least one terminal device through the first interface, so that each terminal device of the at least one terminal device determines whether to activate the fourth interface according to the TA identification information, and executes a TA update procedure with the second interface of the network device through the fourth interface.

The first communication method may be communication between WUR interfaces, and the sync frame may be referred to as a WUR sync frame because the sync frame is communicated through the first communication method. The second communication means may be communication between the primary communication interfaces.

When the network device sends the synchronization frame to the third interface of the at least one terminal device (e.g., User Equipment (UE)) through the first interface, the third interface is in an active state, and the fourth interface is in a closed state (e.g., a sleep state).

The WUR synchronization frame carries TA identification information, so that IDLE state UE can judge whether a TA updating process needs to be executed without activating a main communication interface to monitor a system message (SIB1) of a new serving cell after finishing cell reselection, and power is saved.

In one possible design, the synchronization frame further includes cell identification information of a cell to which the network device belongs.

The WUR synchronization frame carries cell identification information, so that the IDLE UE does not need to activate a main communication interface to monitor system information (MIB) of other cells to acquire cell identification when the cell is reselected, and the UE has low receiving power consumption.

In one possible design, the transmission of the synchronization frame is periodic, and the synchronization frame further includes a transmission period of the synchronization frame.

For the condition that the WUR synchronous frame periods of different cells can be different, the sending period of the synchronous frame carried in the WUR synchronous frame can enable the UE to deduce the sending time of all the subsequent synchronous frames only by receiving one synchronous frame of a new service cell.

In one possible design, the first interface and the third interface are wake-up radio frequency interfaces, and the second interface and the fourth interface are master communication interfaces.

Since the third interface is a WUR interface and the fourth interface is a master communication interface, the fourth interface is in an off state and the third interface is in an active state, which is beneficial to saving power for the UE.

In a ninth aspect, an embodiment of the present application provides a data transmission method, where the method is applied to a network device and at least one terminal device, the network device includes a first interface and a second interface, the terminal device includes a third interface and a fourth interface, the first interface and the third interface communicate through a first communication method, and the second interface and the fourth interface communicate through a second communication method;

the method comprises the following steps:

the terminal device receives a synchronization frame sent by the network device through a first interface through the third interface, wherein the synchronization frame comprises TA identification information of a tracking area TA to which the network device belongs;

and the terminal equipment determines whether to activate the fourth interface according to the TA identification information so as to execute a TA updating process with a second interface of the network equipment through the fourth interface.

In one possible design, the determining, by the terminal device, whether to activate the fourth interface according to the TA identification information, so as to execute a TA update procedure with a second interface of the network device through the fourth interface, includes:

and when the TA indicated by the TA identification information is not included in the TA list saved by the terminal equipment, the terminal equipment activates the fourth interface and executes a TA updating process with a second interface of the network equipment through the fourth interface.

The UE moves out of the TA List range configured by the network side to itself, so the primary communication interface needs to be opened to execute the TA update procedure.

and when the TA indicated by the TA identification information is included in a TA list saved by the terminal equipment, the terminal equipment does not activate the fourth interface.

The UE does not move out of the TA List range configured for the UE by the network side, and the TA List does not need to be updated. Since the decision is made by listening to the sync frame on the third interface (WUR interface) instead of listening to the system messages on the fourth interface (host communication interface), the process is more power efficient than the conventional approach.

Since the third interface is a wake-up radio frequency interface (WUR interface) and the fourth interface is a master communication interface, the fourth interface is turned off and the third interface is activated, which is beneficial to saving power of the UE.

In a tenth aspect, an embodiment of the present application provides a network device, where the network device includes:

a processor, a memory, and a transceiver;

the transceiver is used for receiving and transmitting data;

the memory to store instructions;

the processor is configured to execute the instructions in the memory to perform the method as designed by any one of the eighth aspect and the eighth aspect.

In one possible design, the transceiver is a master communication module configured to transmit the synchronization frame according to any one of the eighth aspect and the eighth aspect.

The primary communication module may be an LTE/NR module. The sync frame may be a sync frame that the WUR interface can recognize, and may also be referred to as a WUR sync frame.

In one possible design, the network device further includes a transmitter configured to transmit the synchronization frame as designed according to any one of the eighth aspect and the eighth aspect.

The transmitter may be a WUR module (also referred to as a WUR interface) having a function of transmitting a signal. The sync frame may be a sync frame that the WUR interface can recognize, and may also be referred to as a WUR sync frame.

In an eleventh aspect, an embodiment of the present application provides a terminal device, where the terminal device includes:

a processor, a memory, a transceiver, and a receiver;

the transceiver is used for receiving and transmitting data;

the memory is to store instructions;

the processor is configured to execute the instructions in the memory to perform the method as designed by any one of the ninth aspect and the ninth aspect.

In one possible design, the receiver is configured to receive a synchronization frame as designed according to any one of the ninth aspect and the ninth aspect.

The receiver may be a WUR, also referred to as a WUR module (also referred to as a WUR interface). The sync frame may be a sync frame that the WUR interface can recognize, and may also be referred to as a WUR sync frame.

In a twelfth aspect, embodiments of the present application provide a computer program product, which includes a computer program, when executed on a computer unit, will make the computer unit implement the method designed in any one of the eighth and eighth aspects.

In a thirteenth aspect, an embodiment of the present application provides a computer program product, which includes a computer program, when the computer program is executed on a computer unit, the computer unit will implement the method designed in any one of the ninth and ninth aspects.

In a fourteenth aspect, embodiments of the present application provide a computer program, which, when executed on a computer unit, will enable the computer unit to implement the method of any one of the eighth aspect and the eighth aspect.

In a fifteenth aspect, the present application provides a computer program, which when executed on a computer unit, causes the computer unit to implement the method of any one of the ninth and ninth aspects.

In a sixteenth aspect, embodiments of the present application provide a network device configured to perform the method as designed in any one of the eighth aspect and the eighth aspect.

In a seventeenth aspect, embodiments of the present application provide a terminal device configured to perform the method as designed in any one of the ninth and ninth aspects.

In this embodiment of the present application, after a terminal device reselects a target serving cell, the terminal device obtains identification information of a TA to which the target serving cell belongs from a synchronization frame sent by a network device of the target serving cell received through a WUR interface, further determines a TAI of the TA to which the target serving cell belongs according to the identification information of the TA to which the target serving cell belongs, and determines whether TA update is to be performed according to the TAI of the TA to which the target serving cell belongs, when necessary, keeps a main communication interface in a closed state, and when not necessary, keeps the main communication interface of the terminal device in a closed state, where the terminal device determines whether TA update is to be performed according to the identification information of the TA to which the target serving cell belongs. Through the scheme provided by the embodiment of the application, the situation that TA updating is not needed when the terminal equipment receives the TAI of the TA to which the system information belongs through the main communication interface is avoided, the main communication interface of the terminal equipment is in a closed state, and complex signal processing operations such as Fast Fourier Transform (FFT), Forward Error Correction (FEC) and the like are also avoided being performed on the signals received through the main communication interface, so that the power consumption of the terminal equipment can be reduced.

Drawings

Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a terminal device and a network device according to an embodiment of the present application;

fig. 3 is a schematic diagram of a wakeup window of a WUR interface of a terminal device according to an embodiment of the present application;

fig. 4 is a flowchart of a method for obtaining a tracking area identity TAI of a cell reselection target serving cell according to an embodiment of the present application;

fig. 5A to fig. 5C are schematic diagrams illustrating that a network device respectively sends synchronization frames according to an embodiment of the present application;

fig. 6 is a flowchart of TA update provided in an embodiment of the present application;

fig. 7 is a flowchart of another method for obtaining a tracking area identity TAI of a cell reselection target serving cell according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another terminal device provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of another network device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of another terminal device provided in an embodiment of the present application;

fig. 11 is a schematic structural diagram of another network device according to an embodiment of the present application;

fig. 12 is a schematic view of an application scenario provided in an embodiment of the present application;

fig. 13 is a schematic diagram illustrating a base station transmitting a synchronization frame according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a base station according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.

The technical scheme described in the embodiment of the application can be used for the fifth generation mobile communication technology (5G) and can also be used for the next generation mobile communication system.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

(1) A network device, e.g., including a base station (e.g., access point), can refer to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices. The base station may be configured to interconvert received air frames and IP packets as a router between the terminal device and the rest of the access network, which may include an IP network. The base station may also coordinate management of attributes for the air interface. For example, the base station may include an evolved Node B (NodeB, eNB, or e-NodeB) in a Long Term Evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-a), or may also include a next generation Node B (gNB) in a 5G system, which is not limited in the embodiments of the present application.

(2) Terminal equipment, including devices that provide voice and/or data connectivity to a user, may include, for example, handheld devices with wireless connection capability or processing devices connected to wireless modems. The terminal device may communicate with a core Network via a Radio Access Network (RAN), and exchange voice and/or data with the RAN. The Terminal Device may include a User Equipment (UE), a wireless Terminal Device, a Mobile Terminal Device, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (AP), a Remote Terminal Device (Remote Terminal), an Access Terminal Device (Access Terminal), a User Terminal Device (User Terminal), a User Agent (User Agent), or a User Equipment (User Device), etc. For example, mobile phones (or so-called "cellular" phones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included or vehicle-mounted mobile devices, smart wearable devices, and the like may be included. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), smart watches, smart helmets, smart glasses, smart bracelets, and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Including, for example, bar codes, Radio Frequency Identification (RFID), sensors, Global Positioning Systems (GPS), laser scanners, and other information sensing devices.

(3) The terms "system" and "network" in the embodiments of the present application may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present application. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.

In the embodiment of the application, after the terminal device reselects a target serving cell, the terminal device obtains identification information of a TA to which the target serving cell belongs from a synchronization frame sent by a network device of the target serving cell received through a WUR interface, and then determines the TAI of the TA to which the target serving cell belongs according to the identification information of the TA to which the target serving cell belongs.

Please refer to fig. 1, which is an application scenario of the present application. In fig. 1, a plurality of base stations and a terminal device located within a common coverage area of the plurality of base stations are included, and each of the plurality of base stations generates a synchronization frame, respectively, and broadcasts the respectively generated synchronization frames.

In the following description, the technical solution provided by the embodiment of the present application is applied to the application scenario shown in fig. 1 as an example, and a network device is a base station as an example.

The embodiment of the application provides a method and equipment for acquiring identification information of a tracking area TA of a cell reselection target serving cell, which are suitable for terminal equipment and a base station. Fig. 2 shows a block diagram of a possible terminal device and base station. The terminal device 20 shown in fig. 2 includes: a Wake-up Radio (WUR) interface 201, a main Radio interface (MainRadio)202, and the like. The base station 21 shown in fig. 2 includes: a main communication interface 211. Those skilled in the art will appreciate that the structure of the terminal device 20 shown in fig. 2 does not constitute a limitation of the terminal device 20, and the terminal device 20 provided in the embodiments of the present application may include more or less components than those shown, or may combine some components, or may be arranged in different components. Also, the structure of the base station 21 shown in fig. 2 does not constitute a limitation to the base station 21, and the base station 21 provided in the embodiment of the present application may include more components than those shown in the drawings, or may combine some components, or may arrange different components.

The following describes each component of the terminal device 20 and the base station 21 in detail with reference to fig. 2:

the WUR interface 201 is configured to receive a wake-up signal, such as a wake-up Packet (Wakeup Packet), or a wake-up frame, sent by the base station 21, and send a trigger signal to the host communication interface 202 to wake up the host communication interface 202 in an off state after the WUR interface 201 receives the wake-up signal. Wherein, a trigger signal, such as an interrupt signal, may be sent to the host communication interface 202 by the WUR interface 201 in a wired manner or a wireless manner, or may be sent to the host communication interface 202 by a processor of the terminal device 20, for example, in an actual system, the WUR interface 201 forwards a received wake-up signal to the processor, and the processor determines whether to activate the host communication interface 202, where the trigger signal is sent to the host communication interface 202 by the processor;

the main communication interface 202, such as a Long Term Evolution (LTE), a New Radio (NR), or a Wireless Fidelity (WiFi) interface, is usually in a closed state, and only when receiving a trigger signal sent by the WUR interface 201 or a processor of the terminal device 20, the main communication interface 202 is in an activated state to perform data interaction with the main communication interface 211 of the base station 21.

In the embodiment of the present application, the WUR interface 201 has a simpler circuit structure to achieve low power consumption, for example, the circuit structure of the WUR interface 201 may include an energy detection and a radio Frequency part, and cannot demodulate a complex modulation manner, so that the wake-up signal also needs to adopt a simple modulation manner, such as On-Off Keying (OOK) modulation, Amplitude Shift Keying (ASK) or Frequency Shift Keying (FSK). The WUR interface 201 may be continuously active or may be activated at certain time intervals to reduce the power consumption of the terminal device 20. When the WUR interface 201 is activated at a certain time interval, the terminal device 20 needs to perform time synchronization with the base station 21. The time window in which the WUR interface 201 is in the active state may be referred to as an awake window, and the starting time of the awake window, the duration of the awake window, and the period of the awake window may be predetermined by the base station 21 and the terminal device 20, or configured by the base station 21 to the terminal device 20. Referring to fig. 3, an example of a wake-up window of a WUR interface has a period of 120 milliseconds (ms) and a duration of 2 ms.

With continued reference to fig. 2, the base station 21 comprises a primary communication interface 211, and the base station 21 may generate a wake-up signal from the primary communication interface 211, since for the current third generation partnership (3)^rdGeneration Partnership Project, 3GPP) standard, the main communication interface 211 of the base station 21 is typically an Orthogonal Frequency Division Multiplexing (OFDM) wideband transmitter, and the wake-up signal may be a narrowband signal, which may be generated by the OFDM wideband transmitter in order to reduce the manufacturing cost of the base station 21 and simplify the structure of the base station 21. For example, a part of subcarriers of the OFDM signal is left empty and the signal is transmitted only on a narrow band corresponding to the wake-up signal, thereby generating a narrow band signal. It should be noted that, in a specific implementation, the base station 21 may also separately implement the host communication interface 211 and the WUR interface, that is, the base station 21 shown in fig. 2 may also include both the host communication interface 211 and the WUR interface.

In addition, the base station 21 and the terminal device 20 shown in fig. 2 are both configured with one antenna, which mainly considers that the same antenna can be shared when the WUR interface 201 and the host communication interface 202 of the terminal device 20 use the same or close frequency band carriers, so as to save the manufacturing cost of the terminal device 20 and simplify the device structure. Of course, when the WUR interface 201 and the host communication interface 202 of the terminal device 20 use different frequency band carriers with a large interval in the frequency domain, the WUR interface 201 and the host communication interface 202 of the terminal device 20 should be configured with different antennas. For example, the host communication interface 202 of the terminal device 20 uses a 6GHz band, and the WUR interface 201 uses a 1.8GHz band, and different antennas should be configured for the host communication interface 202 and the WUR interface 201. When the main communication interface 211 and the WUR interface of the base station 21 are separately implemented and the main communication interface 211 and the WUR interface use carriers of different frequency bands with large intervals in the frequency domain, different antennas should be configured on the main communication interface 211 and the WUR interface of the base station 21.

In the embodiment of the present application, the cell reselection performed by the terminal device 20 may be triggered by a periodic measurement or an event. For example, when the terminal device 20 measures the reference signal or the synchronization frame of the source serving cell and finds that the received power is smaller than a specific threshold, the terminal device 20 is triggered to perform cell reselection, that is, the reference signal or the synchronization frame of N candidate serving cells (neighboring serving cells) for cell reselection is measured and a target serving cell for cell reselection is determined, thereby completing cell reselection. The specific criteria for the terminal device 20 to determine the target serving cell according to the measurement results of the N candidate serving cells may be determined by the terminal device 20, for example, the terminal device 20 selects the candidate serving cell with the highest received power as the target serving cell for cell reselection. When the measurement objects of the terminal device 20 for cell reselection are different, the timing for the terminal device 20 to receive the synchronization frame sent by the base station 21 is also different, for example, the terminal device 20 performs cell reselection based on the reference signals sent by the N base stations 21 of the N candidate serving cells, and the terminal device 20 receives the synchronization frame sent by the network device of the target serving cell after determining the target serving cell; or the terminal device 20 performs cell reselection based on the synchronization frames transmitted by the N base stations 21 of the N candidate serving cells, and the terminal device 20 receives the synchronization frames transmitted by each base station 21 of the N base stations 21 of the N candidate serving cells through the WUR interface before performing cell reselection, which is described below.

Referring to fig. 4, an embodiment of the present application provides a method and an apparatus for obtaining identification information of a tracking area TA of a cell reselection target serving cell, where the method is applied to the terminal apparatus 20 and the base station 21 shown in fig. 2.

S41: the base station 21 generates a synchronization frame, wherein the synchronization frame comprises identification information of a tracking area TA to which a cell in which the base station 21 is located belongs; in the embodiment of the present application, the TA is a communication system, for example, the concept introduced by LTE to simplify the location management of the terminal device 20, and represents a set of cells. The cells are grouped into the same TA, i.e. each TA comprises at least one cell, and each cell can only belong to one TA.

In this embodiment of the application, the identification information of the Tracking Area TA to which the cell where the base station 21 is located belongs may be a Tracking Area Identification (TAI), which includes a Public Land Mobile Network (PLMN) and a Tracking Area Code (TAC).

The identification information of the Tracking Area TA belonging to the cell in which the base station 21 is located may also be part of information included in the TAI, for example, a Tracking Area Code (TAC) included in the TAI. This is because the PLMN included in the TAI is used to identify the network service operator, and a frequency band in the same region is usually allocated to one operator, so the PLMN may not be included in the identification information of the tracking area TA to which the cell where the base station 21 is located belongs. When the identification information of the tracking area TA to which the cell where the base station 21 is located belongs is TAC, the length of the identification information of the tracking area TA to which the cell where the base station 21 is located belongs is shortened, that is, the length of the synchronization frame is shortened, and when the length of the synchronization frame is shortened, resources used by the base station 21 for sending the synchronization frame are reduced, so that the resource overhead of the base station 21 is reduced. Then, in order to further reduce the resource overhead of the base station 21, the identification information of the tracking area TA to which the cell where the base station 21 is located belongs may also be a part of the TAC, for example, a few lower bits of the TAC.

The identification information of the tracking area TA of the cell in which the base station 21 is located may also be indication information of the TAI of the cell in which the base station 21 is located, for example, the indication information is a sequence, and different sequences represent different TAIs, as an example, 001 is used to indicate TAI1, 010 is used to indicate TAI2, or 100 is used to indicate TAI 3.

The identification information of the tracking area TA of the cell where the base station 21 is located may also be identification information for identifying the TAI, which is generated by the base station 21 according to the TAI of the cell where the base station 21 is located, for example, the TAI of the cell where the base station 21 is located is mapped to a hash value by using a hash algorithm to identify the TAI of the cell where the base station 21 is located.

S42: the base station 21 transmits a synchronization frame, and accordingly, the terminal device 20 receives, through the wake-up rf WUR interface 201, the synchronization frame transmitted by each base station 21 of the N base stations 21 of the N candidate serving cells, where N is an integer greater than or equal to 1. Here, the N base stations 21 of the N candidate serving cells are referred to as N candidate base stations 21, the base station of the serving cell (i.e., the source serving cell) in which the terminal device 20 performs cell reselection is referred to as the source base station 21, and the serving cell in which the source base station 21 is located is referred to as the source serving cell; the serving cell in which the terminal device reselects is referred to as a target serving cell, and the base station 21 of the target serving cell is referred to as a target base station 21. The terminal device 20 corresponds to an awake window, the awake window is determined by the terminal device 20 in the source serving cell where the source base station 21 is located, the awake window includes a start time of the awake window and a duration of the awake window, and the duration of the awake window is a duration of the first window.

In the embodiment of the present application, the N candidate base stations 21 and the source base station 21 may transmit the synchronization frame at a preset period. Taking any one candidate base station 21 of the N candidate base stations 21 as an example, the preset period may be configured by any one candidate base station 21, for example, any one candidate base station 21 may be configured through Radio Resource Control (RRC) signaling, Master Information Block/System Information Block (MIB/SIB), Media Access Control Element (MAC CE), or physical downlink Control channel (pdcch) configuration; or configuring a parameter from the parameter set configured by the RRC signaling by the MAC CE or the physical layer signaling to the terminal device 20; the preset period may also be specified by a standard protocol. In this embodiment of the present application, the source base station 21 or any one of the candidate base stations 21 sends configuration information to the terminal device 20, where the configuration information includes a preset period. For the terminal device 20 in the connected state, the base station may configure a preset period for the terminal device 20 through the configuration information; for the terminal device 20 in the idle state, the terminal device may use a standard predefined preset period, or use a stored preset period (configured by the base station when the terminal device is in the connected state before the terminal device), or the terminal device 20 actively searches for the synchronization frame, and determines the preset period according to the received synchronization frame or frames.

In the embodiment of the present application, for the terminal device 20 in the connected state, the source base station 21 or any one of the candidate base stations 21 may configure, in addition to the period for transmitting the synchronization frame through the base station configuration information, the time and/or frequency resource used for transmitting the synchronization frame and the awake window length of the terminal device 20 in the base station configuration information. Of course, the above parameters may also be predefined by the standard. Meanwhile, the source base station 21 or any one of the candidate base stations 21 may also configure the start time of the synchronization frame transmission in the base station configuration information, and the time when the source base station 21 or any one of the candidate base stations 21 transmits the synchronization frame may be represented by a time offset, for example, the time offset may be a time interval between the first synchronization frame and the base station configuration information. The source base station 21 or any one of the candidate base stations 21 may send the base station configuration information to the main communication interface 202 of the terminal device 20 through the main communication interface when the terminal device 20 is in the connected state.

The period of the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21 may be the same as or different from the period of the synchronization frame transmitted by the source base station 21 of the terminal device 20; the start time of the synchronization frame transmitted by each candidate base station 21 may be the same as or different from the start time of the synchronization frame transmitted by the source base station 21, and will be described separately below.

1. The period of the synchronization frame sent by each candidate base station 21 in the N candidate base stations 21 is the same as the period of the synchronization frame sent by the source base station 21, and the interval between the starting time of the synchronization frame sent by each candidate base station 21 in the N candidate base stations 21 and the starting time of the synchronization frame sent by the source base station 21 is less than or equal to a preset value;

referring to fig. 5A, taking the candidate bs 21(1) and the source bs 21(2) as an example, the period of the candidate bs 21(1) sending the synchronization frame 1 is the same as the period of the source bs 21(2) sending the synchronization frame 2, and the interval between the start time of the candidate bs 21(1) sending the synchronization frame 1 and the start time of the source bs 21(2) sending the synchronization frame 2 is smaller than or equal to the predetermined value.

In the embodiment of the present application, when the period of the candidate base station 21(1) for sending the synchronization frame 1 is the same as the period of the source base station 21(2) for sending the synchronization frame, if the start time of the candidate base station 21(1) for sending the synchronization frame 1 is also the same as the start time of the source base station 21(2) for sending the synchronization frame 2, interference may occur between the synchronization frame 1 sent by the candidate base station 21(1) and the synchronization frame 2 sent by the source base station 21 (2). To avoid interference, the candidate base station 21(1) and the source base station 21(2) may mutually agree in advance to send a time interval between the synchronization frame 1 and the synchronization frame 2, for example, an interval between the starting time of the candidate base station 21(1) sending the synchronization frame 1 and the starting time of the source base station 21(2) sending the synchronization frame 2 is less than or equal to a preset value, which is a first window duration of the WUR interface 201 of the terminal device 20, for example, a duration of the wakeup window shown in fig. 3 is 2 ms.

2. The period of the synchronization frame sent by each candidate base station 21 in the N candidate base stations 21 is the same as the period of the synchronization frame sent by the source base station 21, and the interval between the starting time of the synchronization frame sent by at least one candidate base station 21 in the N candidate base stations 21 and the starting time of the synchronization frame sent by the source base station 21 is greater than a preset value;

referring to fig. 5B, taking the candidate base station 21(1) and the source base station 21(2) of the at least one candidate base station 21 as an example, the period of the candidate base station 21(1) sending the synchronization frame 1 is the same as the period of the source base station 21(2) sending the synchronization frame 2, and the interval between the starting time of the candidate base station 21(1) sending the synchronization frame 1 and the starting time of the source base station 21(2) sending the synchronization frame 2 is greater than a preset value, where the preset value is a first window duration of the WUR interface 201 of the terminal device 20, for example, the duration of the wakeup window shown in fig. 3 is 2 ms.

3. The period of the synchronization frame sent by at least one candidate base station 21 of the N candidate base stations 21 is different from the period of the synchronization frame sent by the source base station 21;

referring to fig. 5C, taking the candidate base station 21(1) and the source base station 21(2) of the at least one candidate base station 21 as an example, the period of the candidate base station 21(1) sending the synchronization frame 1 is different from the period of the source base station 21(2) sending the synchronization frame 2.

Based on the above description, the WUR interface 201 of the terminal device 20 may be continuously activated or may be activated at certain time intervals. When the WUR interface 201 of the terminal device 20 is continuously in an active state, no matter which transmission method the N candidate base stations 21 respectively transmit the synchronization frame, the terminal device 20 can receive the synchronization frame respectively transmitted by each candidate base station 21 of the N candidate base stations 21 through the WUR interface 201 within the first window duration. However, in the case that the WUR interface 201 of the terminal device 20 is activated at a certain time interval, when each candidate base station 21 of the N candidate base stations 21 adopts a different transmission method, the terminal device 20 needs to adopt a different reception method, which will be described below.

With respect to the mode 1, since the period of the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21 is the same as the period of the synchronization frame transmitted by the source base station 21, the interval between the start time of the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21 and the start time of the synchronization frame transmitted by the source base station 21 is less than or equal to the first window duration, so that the terminal device 20 can receive the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21 through the WUR interface 201 within the first window duration. For example, the terminal device 20 can always receive the synchronization frame transmitted by the candidate base station 21(1) through the WUR interface 201 within the first window duration.

Secondly, with respect to the method 2, since the interval between the start time of the synchronization frame transmitted by at least one candidate base station 21 of the N candidate base stations 21 and the start time of the synchronization frame transmitted by the source base station 21 is greater than the first window duration, the terminal device 20 may not be able to receive the synchronization frame respectively transmitted by each candidate base station 21 of the N candidate base stations 21 through the WUR interface 201 within the first window duration. In this case, the terminal device 20 may control the duration of the activation state of the WUR interface 201 to be a first duration, which is longer than the first window duration, so as to receive, through the WUR interface 201, the first synchronization frame respectively transmitted by each of the N candidate base stations 21 within the first duration, where the first synchronization frame respectively transmitted by each of the N candidate base stations 21 may be the first synchronization frame respectively transmitted by each candidate base station 21, and the second synchronization frame respectively transmitted by each candidate base station 21, which is not particularly limited herein. In the embodiment of the present application, after the terminal device 20 receives the first synchronization frame respectively transmitted by each candidate base station 21 of the N candidate base stations 21, the first synchronization frame transmitted by each candidate base station 21 is measured, for example, the first synchronization frame transmitted by each candidate base station 21 is measured, the second synchronization frame transmitted by each candidate base station 21 is measured, or the first synchronization frame and the second synchronization frame transmitted by each candidate base station are measured, then the measurement result of the measurement of the first synchronization frame and the measurement result of the measurement of the second synchronization frame are averaged to obtain N measurement results, a target serving cell is determined from the N candidate serving cells according to the N measurement results, then the duration of the WUR interface 201 in the active state is adjusted to be the second duration smaller than the first duration according to the time of receiving the first synchronization frame transmitted by the target base station 21, and receiving a subsequent synchronization frame sent by the target base station 21 within a second duration, where the second duration is a duration of an awake window of the WUR interface 201 in the current serving cell after the terminal device 20 selects the target serving cell as the current serving cell. Of course, the terminal device 20 may also adjust the start time of the awake window of its WUR interface 201 in the current serving cell according to the time of receiving the first synchronization frame of the current serving cell.

For example, taking the first window duration of the WUR interface 201 of the terminal device as 2ms, the synchronization frame transmission period as 120ms (which is also the wakeup window period of the WUR interface 201), the start-stop time (system clock) of one wakeup window as 995ms to 997ms, and the first synchronization frame as the first synchronization frame transmitted by the target base station 21 as an example, the terminal device 20 first controls the duration of the active state of the WUR interface 201 to be 6ms, which is a first duration greater than the first window duration, and receives the first synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21 within the first duration. After determining the target serving cell, taking that the target serving cell is the serving cell in which the candidate base station 21(1) is located, in this case, the candidate base station 21(1) is the target base station 21(1), the period of the sync frame is 120ms, and the time (system clock) when the terminal device 20 receives the first sync frame transmitted by the target base station 21(1) is 1000ms, for example, the terminal device 20 may determine the arrival time of the second sync frame transmitted by the target base station 21(1) to be 1120ms according to the sync frame transmission period 120ms and the arrival time of the sync frame to be 1000ms, further adjust the start time when the WUR interface 201 is in the active state according to the time, and adjust the duration when the WUR interface 201 is in the active state to be the second duration, for example, after receiving the first sync frame transmitted by the target base station 21(1) through the WUR interface 201, control the WUR interface 201 to be in the off state, activate the WUR interface 201 at the time of 1120ms, and controls the duration of the WUR interface 201 in the active state to be a second duration 3ms, which is less than the first duration. In the embodiment of the present application, the terminal device may adjust the start time of the WUR interface 201 in the active state and the duration of the WUR interface in the active state in real time according to the actual situation, so as to reduce the power consumption of the terminal device 20 while ensuring accurate reception of the subsequent synchronization frame sent by the target base station 21 (1).

With regard to the method 3, since the period of the synchronization frame transmitted by at least one candidate base station 21 of the N candidate base stations 21 is different from the period of the synchronization frame transmitted by the source base station 21, the WUR interface 201 of the terminal device 20 may not receive the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21 within the first window duration. In this case, the terminal device 20 may control the duration of the activation state of the WUR interface 201 to be a third duration greater than the first window duration, so as to receive, through the WUR interface 201, the first synchronization frame respectively transmitted by each candidate base station 21 of the N candidate base stations 21 within the third duration, where the first synchronization frame respectively transmitted by each candidate base station 21 of the N candidate base stations 21 may be the first synchronization frame respectively transmitted by each candidate base station 21, and the second synchronization frame respectively transmitted by each candidate base station 21, which is not particularly limited herein. In the embodiment of the present application, after the terminal device 20 receives the first synchronization frame respectively transmitted by each candidate base station 21 of the N candidate base stations 21, the first synchronization frame transmitted by each candidate base station 21 is measured, for example, the first synchronization frame transmitted by each candidate base station 21 is measured, the second synchronization frame transmitted by each candidate base station 21 is measured, or the first synchronization frame and the second synchronization frame transmitted by each candidate base station are measured, then the measurement result of the measurement of the first synchronization frame and the measurement result of the measurement of the second synchronization frame are averaged to obtain N measurement results, and the target serving cell is determined from the N candidate serving cells according to the N measurement results.

In the third embodiment, since the terminal device 20 cannot know in advance the period in which each candidate base station 21 of the N candidate base stations 21 respectively transmits the synchronization frame, in order to ensure that the subsequent synchronization frame transmitted by the target base station 21 can be correctly received, the terminal device 20 needs to determine the period in which the target base station 21 transmits the synchronization frame.

As an example, the terminal device 20 determines the period of the target base station 21 sending the synchronization frame according to the time of receiving the first synchronization frame sent by the target base station 21, or according to the time of receiving the first synchronization frame sent by the target base station 21 and the time of receiving the second synchronization frame sent by the target base station 21, and further adjusts the duration of the active state of the WUR interface 201 to a fourth duration less than the third duration according to the calculated period and the time of receiving the subsequent synchronization frame sent by the target base station 21, and receives the subsequent synchronization frame sent by the target base station 21 within the fourth duration, where the fourth duration is the duration of the awake window of the WUR interface 201 in the current serving cell after the terminal device 20 selects the target serving cell as the current serving cell. Of course, the terminal device 20 may also adjust the start time of the awake window of its WUR interface 201 in the current serving cell according to the time of receiving the first synchronization frame of the current serving cell, or according to the time of receiving the first synchronization frame and the second synchronization frame of the current serving cell and the synchronization frame transmission period of the current serving cell.

For example, taking the window duration of the WUR interface 201 as 2ms, the synchronization frame transmission period as 120ms (that is, the awake window period of the WUR interface 201), the starting time (system clock) of an awake window as 995ms to 997ms, and the first synchronization frame as the first synchronization frame transmitted by the target base station 21 as an example, the terminal device 20 first controls the duration of the active state of the WUR interface 201 as a third duration 6ms longer than the first window duration, receives the first synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21 within the third duration, and receives the second synchronization frame transmitted by the target base station 21 after the target serving cell is determined. Then, taking the target serving cell as the serving cell where the candidate base station 21(1) is located, the terminal device 20 receives the candidate base station 21(1), that is, the time (system clock) of the first sync frame sent by the target base station 21(1) is 1000ms, and the time of the terminal device 20 receiving the second sync frame sent by the target base station 21(1) is 1120ms as an example, the terminal device 20 can thus determine that the period of the sync frame sent by the target base station 21(1) is 120ms, the terminal device 20 can further determine that the time of the third sync frame sent by the target base station 21(1) is 1240ms, further adjust the starting time of the WUR interface 201 in the active state according to the time, and adjust the duration of the WUR interface 201 in the active state to be the fourth duration, for example, after the terminal device 20 receives the second sync frame sent by the target base station 21(1), the WUR interface 201 is controlled to be in the off state, the WUR interface 201 is activated again at the time of 1240ms, and the duration of the activation of the WUR interface 201 is controlled to be the fourth duration 3ms which is less than the third duration. In the embodiment of the present application, the terminal device adjusts the start time of the WUR interface 201 in the active state and the duration of the WUR interface in the active state in real time according to the actual situation, so that the power consumption of the terminal device 20 can be reduced while the subsequent synchronization frame sent by the target base station 21(1) is accurately received.

As another example, the synchronization frame sent by each candidate base station 21 of the N candidate base stations 21 further includes cycle information of the synchronization frame sent by the candidate base station 21, so that after receiving the first synchronization frame sent by the target base station 21, the terminal device 20 can determine the arrival time of the next synchronization frame sent by the target base station 21 according to the time of receiving the first synchronization frame sent by the target base station 21, and dynamically adjust the duration of the WUR interface 201 in the active state to be a sixth duration smaller than the fifth duration according to the time, so as to receive the subsequent synchronization frame sent by the target base station 21 in the sixth duration, where the sixth duration is the duration of the wakeup window of the WUR interface 201 in the current serving cell after the terminal device 20 selects the target serving cell as the current serving cell. Of course, the terminal device 20 may also adjust the start time of the awake window of its WUR interface 201 in the current serving cell according to the time of receiving the first synchronization frame of the current serving cell.

For example, the window duration of the WUR interface 201 of the terminal device 20 is 2ms, the transmission period of the synchronization frame is 120ms (also the awake window period of the WUR interface 201), the start-stop time (system clock) of one awake window is 995ms to 997ms, the first synchronization frame is the first synchronization frame transmitted by the target base station 21, the terminal device 20 controls the duration of the active state of the WUR interface 201 to be a fifth duration 6ms longer than the duration of the first window, and receives the first synchronization frame respectively transmitted by each candidate base station 21 of the N candidate base stations 21 within the fifth duration. After the target serving cell is determined, taking the target serving cell as the serving cell where the candidate base station 21(1) is located, the terminal device 20 receives the candidate base station 21(1), that is, the time of the first sync frame sent by the target base station 21(1) is 1000ms as an example, the terminal device 20 determines the time of the second sync frame sent by the target base station 21(1) to be 1120ms according to the period 120ms of the sync frame sent by the target base station 21(1) carried in the first sync frame sent by the target base station 21(1), and further adjusts the starting time of the WUR interface 201 in the active state and the duration of the WUR interface 201 in the active state to be a sixth duration less than a fifth duration according to the time, for example, after the terminal device 20 receives the first sync frame sent by the target base station 21(1), the WUR interface 201 is controlled to be in the off state, and the WUR interface 201 is activated again at the time of 1120ms, and controlling the duration of the WUR interface 201 in the activated state to be less than the fifth duration and the sixth duration for 3 ms. In the embodiment of the present application, the terminal device adjusts the time when the WUR interface 201 is in the active state and the duration when the WUR interface 201 is in the active state in real time according to the actual situation, so that the power consumption of the terminal device 20 can be reduced while the synchronization frame sent by the target base station 21(1) is accurately received.

In the above two or three modes, in order to ensure that the terminal device 20 can receive the synchronization frame transmitted by each candidate base station 21 of all the candidate base stations 21, it is necessary to control the duration of the active state of the WUR interface 201 to be longer than the period of the awake window of the WUR interface 201 in the source serving cell, for example, 120ms in the above example.

Here, it should be noted that, in the above 1, when the period of the candidate base station 21(1) for transmitting the synchronization frame 1 is the same as the period of the source base station 21(2) for transmitting the synchronization frame, and the interval between the start time of the candidate base station 21(1) for transmitting the synchronization frame 1 and the start time of the source base station 21(2) for transmitting the synchronization frame is less than or equal to the preset value, the interval is predetermined by the standard protocol, or the core network device instructs the terminal device 20 that the period of the synchronization frame transmitted by each candidate base station 21 is the same as the period of the synchronization frame transmitted by the source base station 21, and the interval between the start times of the synchronization frame transmission is smaller than the preset value, that is, the terminal device 20 can know that the period of the synchronization frame transmitted by each candidate base station 21 is the same as the period of the synchronization frame transmitted by the source base station 21, and the interval between the start moments of sending the synchronization frames is less than or equal to the preset value, the terminal device 20 receives the synchronization frames sent by the candidate base station 21(1) by adopting the above-mentioned manner one; in the above 2, when the period of the candidate base station 21(1) transmitting the synchronization frame 1 is the same as the period of the source base station 21(2) transmitting the synchronization frame 2, which is predetermined by the standard protocol, or the core network device instructs the terminal device that the period of the candidate base stations 21 transmitting the synchronization frame is the same as the period of the source base station 21 transmitting the synchronization frame, that is, the terminal device 20 can know that the period of the candidate base stations 21 transmitting the synchronization frame is the same as the period of the source base station 21 transmitting the synchronization frame, and does not know whether the interval between the start time of the candidate base stations 21 transmitting the synchronization frame and the start time of the source base station 21 transmitting the synchronization frame is greater than the preset value, and the terminal device 20 receives the synchronization frame transmitted by the candidate base station 21(1) in the above; in the case of the above 3, there is no need for the standard protocol or the core network device to instruct the terminal device 20, that is, the terminal device 20 cannot know whether the period of the synchronization frame transmitted by each candidate base station 21 is the same as the period of the synchronization frame transmitted by the source base station 21, and the terminal device 20 receives the synchronization frame transmitted by the candidate base station 21(1) in the above manner.

In the embodiment of the present application, the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21 may be used for the terminal device 20 to perform measurement to select a target serving cell from the N candidate serving cells, and meanwhile, the synchronization frame transmitted by each candidate base station 21 of the N base stations 21 may also be used for synchronization between the WUR interface 201 of the terminal device 20 and the candidate base stations 21.

In the embodiment of the present application, the terminal device 20 receives, through the WUR interface 201, the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations, and as described above, signals received through the WUR interface 201 all adopt a simpler modulation method, and after receiving, through the WUR interface 201, the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21, the terminal device 20 can determine, through a simpler detection method, for example, an energy detection method, information carried by the received synchronization frame, where there is 1 energy and no energy is 0. Unlike the signal received through the main communication interface 202, the candidate base station 21 side already adopts more complex modulation and channel coding modes, such as OFDM modulation, Turbo, Low Density Parity Check (LDPC) or Polar, and thus complex signal processing operations such as Fast Fourier Transform (FFT), Forward Error Correction (FEC) and the like need to be performed on the terminal device 20 side, and these complex signal processing operations need to consume a large amount of energy. Therefore, receiving signals through the WUR201 interface can reduce power consumption of the terminal device 20 compared to receiving signals through the host communication interface 202.

Further, the terminal device 20 obtains N measurement results by measuring a first synchronization frame sent by each candidate base station 21 of the N candidate base stations 21, and then after selecting a target serving cell from the N serving cells where the N base stations 21 are located according to the N measurement results, the terminal device can directly obtain the identification information of the TA to which the target serving cell belongs from the synchronization frame sent by the network device of the target serving cell, and further determine the TAI of the TA to which the target serving cell belongs according to the identification information of the TA to which the target serving cell belongs, thereby omitting the steps that the terminal device needs to receive the system message of the target serving cell through a primary communication interface after cell reselection, and perform complex analysis on the system message, and further reducing the power consumption of the terminal device.

In the embodiment of the present application, the process of the terminal device 20 receiving the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21 is applied to the case where each candidate base station 21 of the N candidate base stations 21 transmits the synchronization frame by using the same frequency band carrier, and in this case, the terminal device 20 does not need to perform frequency domain switching when receiving the synchronization frame transmitted by each candidate base station 21 of the N candidate base stations 21. In the case that each candidate base station 21 of the N candidate base stations 21 respectively uses a different frequency band carrier to transmit the synchronization frame, the standard protocol defines a set of frequency band carriers that each candidate base station 21 of the N candidate base stations 21 may use to transmit the synchronization frame, and in this case, the terminal device 20 may alternately listen to each frequency band carrier that may transmit the synchronization frame, that is, perform frame listening reception by using one of the above-mentioned one, two, and three 3 ways for each frequency band carrier. For example, the standard protocol defines that each candidate base station 21 of the N candidate base stations 21 may be used to transmit a synchronization frame, and the set of frequency band carriers includes 2 frequency band carriers, and taking f1 and f2 as examples, the frame listening reception may be performed in one of the above-mentioned one, two, and three 3 manners for f1, and the frame listening reception may be performed in one of the above-mentioned one, two, and three 3 manners for f 2.

S43: the terminal device 20 acquires the identification information of the TA to which the target serving cell belongs from the synchronization frame transmitted by the target base station 21.

In this embodiment of the present application, if the identification information of the TA to which the target serving cell belongs, which is included in the synchronization frame sent by the target base station 21, is a TAI, the terminal device 20 can directly obtain the TAI of the TA to which the target serving cell belongs; if the identification information of the TA to which the target serving cell belongs, which is included in the synchronization frame sent by the target base station 21, is part of the information TAC of the TAI, the terminal device 20 determines the TAI of the TA to which the target cell belongs with the TAC according to the known PLMN; if the identification information of the TA to which the target serving cell belongs, which is included in the synchronization frame sent by the target candidate 21, is the indication information of the TAI of the TA to which the target serving cell belongs, the terminal device 20 obtains the TAI of the TA to which the target serving cell belongs according to the correspondence between the indication information and the TAI.

S44: the terminal device 20 determines whether TA update is required according to the identification information of the TA to which the target serving cell belongs, and keeps the main communication interface of the terminal device in a closed state when the TA update is not required.

In this embodiment, the target serving cell reselected by the terminal device 20 is, for example, a cell where the base station 21(1) is located, and the terminal device 20 obtains, from the candidate base station 21(1), that is, the synchronization frame 2 sent by the target base station 21(1), identification information of a TA to which the target serving cell belongs, for example, TAI. The terminal device 20 may determine whether the TAI of the TA to which the target serving cell belongs is in a TA list stored by the terminal device 20. If the TA list is included, the TA update is not required, and the terminal device 20 may keep the primary communication interface 202 in the off state, so as to reduce the power consumption of the terminal device. If the TA is not in the TA list, the TA update is needed, at this time, the terminal device 20 may activate the primary communication interface 202 to perform the TA update with the target base station 21(1) through the primary communication interface 202, and please refer to fig. 6 for the process of performing the TA update with the target base station 21(1) through the primary communication interface 202 by the terminal device 20.

1. The terminal device 20 initiates a random access (RA Preamble) to the target base station 21 (1);

2. the target base station 21(1) sends a random access Response message (RA Response) to the terminal device 20 after detecting the random access initiated by the terminal device 20;

3. after receiving the RA Response, the terminal device 20 sends an RRC Connection Request message (RRC Connection Request) to the target base station 21 (1);

4. the target base station 21(1) transmits an RRC Connection Setup message (RRC Connection Setup) to the terminal device 20;

5. the terminal device 20 sends an RRC connection setup complete message (RRC connection setup) to the target base station 21(1) according to an RRC connection setup complete Signaling radio bearers (Signaling radio bearers1, SRB1) and radio resource configuration, where the message includes a Tracking Area Update (Tracking Area Update, TAU) Request (TAU Request) message;

6. the target base station 21(1) sends an Initial UE Message (Initial UE Message) to an Evolved Packet Core (EPC), where the Initial UE Message includes a TAU Request;

7. the Authentication/Security (Authentication/Security) process is completed between the terminal device 20 and the EPC;

8. the EPC completes the context update of the terminal device 20;

9. the EPC sends a Downlink non-access stratum Transport message (Downlink NAS Transport) to the target base station 21 (1); the message comprises a TAU acceptance message (TAU Accept);

10. the target base station 21(1) transmits a downlink information transfer message (DL information transfer) to the terminal device 20; the message comprises TAU Accept;

11. the terminal device 20 transmits an uplink information transfer message (UL information transfer) to the target base station 21 (1); the message includes a TAU Complete message (TAU Complete);

12. the target base station 21(1) sends an Uplink non-access stratum Transport message (Uplink NAS Transport) to the EPC; the message includes TAU Complete;

13. the terminal device 20 sends First Uplink Data (First Uplink Data) to the EPC;

14. completing bearer update by the EPC;

15. the EPC transmits First Downlink Data (First Downlink Data) to the terminal device 20;

16. the terminal device 20 enters the idle mode again.

In the embodiment of the present application, the synchronization frame sent by each candidate base station 21 of the N candidate base stations 21 may further include cell identification information of a serving cell in which the candidate base station 21 is located. The process of receiving the system message of the target serving cell through the main communication interface 202 after the terminal device 20 completes cell reselection to acquire the cell identification information of the serving cell where the candidate base station 21 of the target cell is located from the system message is omitted, so that the power consumption of the terminal device can be reduced.

The Cell identification information of the serving Cell in which the candidate base station 21 is located in the embodiment of the present application may be a Physical-layer Cell Identity (PCI), or may be partial information in the PCI, or indication information used for indicating the PCI, and after the terminal device 20 acquires the indication information, the PCI indicated by the indication information may be determined according to a corresponding relationship between the indication information and the PCI.

It should be noted that, the synchronization frame respectively transmitted by each candidate base station 21 of the N candidate base stations 21 may only include the cell identification information of the cell in which the candidate base station 21 is located, that is, each candidate base station 21 of the N candidate base stations 21 includes the identification information of the TA belonging to the cell in which the candidate base station 21 is located and/or the cell identification information of the cell in which the candidate base station 21 is located.

Referring to fig. 7, an embodiment of the present application provides a method and an apparatus for obtaining identification information of a tracking area TA of a cell reselection serving cell, where the method is applied to the terminal apparatus 20 and the base station 21 shown in fig. 2.

S71: the base station 21 generates a synchronization frame, wherein the synchronization frame comprises identification information of a tracking area TA to which a cell in which the base station 21 is located belongs;

the synchronization frame includes the identification information of the tracking area TA of the cell where the base station 21 is located, and the identification information of the tracking area TA of the cell where the base station 21 is located in the fourth embodiment is not described herein again.

S72: the base station 21 transmits a synchronization frame.

In the embodiment of the present application, the base station 21 broadcasts the synchronization frame at a certain preset period after generating the synchronization frame, and the terminal device 20 receives the synchronization frame sent by the base station 21 only after determining the target serving cell.

S73: after determining the target serving cell, the terminal device 20 receives a synchronization frame sent by the target base station 21 through the wake-up radio WUR interface 201;

in the embodiment of the present application, the target base station 21 is a target serving cell after the terminal device 20 performs cell reselection, that is, a base station of a new serving cell determined by the terminal device 20 through cell reselection.

In the embodiment of the present application, the terminal device 20 determines the target serving cell, for example, receives, through the primary communication interface 202, the reference signal respectively transmitted by each base station 21 of N base stations 21 of N candidate serving cells, where N is an integer greater than or equal to 1. The terminal device 20 measures the reference signal transmitted by each base station 21, and selects a target serving cell from the N serving candidate cells according to the obtained N measurement results. After the target serving cell is determined, the synchronization frame transmitted by the target base station 21 is received through the WUR interface. Here, the N base stations 21 of the N candidate cells are referred to as N candidate base stations 21, the base station 21 of the target serving cell is referred to as a target base station 21, the base station of the serving cell in which the terminal device is located when performing cell reselection is referred to as a source base station 21, and the serving cell in which the source base station 21 is located is referred to as a source serving cell. The terminal device 20 corresponds to an awake window, the awake window is determined by the terminal device 20 in the source serving cell where the source base station 21 is located, the awake window includes a start time of the awake window and a duration of the awake window, and the duration of the awake window in the source serving cell of the terminal device 20 is referred to as a first window duration.

In the embodiment of the present application, the period of the synchronization frame sent by the target base station 21 may be the same as or different from the period of the synchronization frame sent by the source base station 21; the start time of the synchronization frame transmitted by the target base station 21 may be the same as or different from the start time of the synchronization frame transmitted by the source base station 21. Described separately below.

1. The period of the target base station 21 transmitting the synchronization frame is the same as the period of the source base station 21 transmitting the synchronization frame, and the interval between the starting time of the target base station 21 transmitting the synchronization frame and the starting time of the source base station 21 transmitting the synchronization frame is less than or equal to a preset value, wherein the preset value is the first window duration of the WUR interface 201 of the terminal device 20.

2. The period of the target base station 21 transmitting the synchronization frame is the same as the period of the source base station 21 transmitting the synchronization frame, and the interval between the starting time of the target base station 21 transmitting the synchronization frame and the starting time of the source base station 21 transmitting the synchronization frame is greater than a preset value, wherein the preset value is the first window duration of the WUR interface 201 of the terminal device 20.

3. The period of the target base station 21 transmitting the synchronization frame is different from the period of the source base station 21 transmitting the synchronization frame, and the interval between the starting time of the target base station 21 transmitting the synchronization frame and the starting time of the source base station 21 transmitting the synchronization frame is greater than a preset value, wherein the preset value is the first window duration of the WUR interface 201 of the terminal device 20.

Here, it should be noted that, in the above 1, when the period of the target base station 21 transmitting the synchronization frame 1 is the same as the period of the source base station 21 transmitting the synchronization frame, and the interval between the start time of the target base station 21(1) transmitting the synchronization frame 1 and the start time of the source base station 21 transmitting the synchronization frame is less than or equal to the preset value, it is predetermined by the standard protocol, or the core network device instructs each target base station 21 of the terminal device 20 to transmit the synchronization frame with the same period as the source base station 21 and the interval between the start times of the synchronization frame transmission is smaller than the preset value, that is, the terminal device 20 can know that the period of the synchronization frame transmission by the target base station 21 is the same as the period of the synchronization frame transmission by the source base station 21, and the interval between the start moments of sending the synchronization frames is less than or equal to the preset value, the terminal device 20 receives the synchronization frames sent by the target base station 21 in the above manner one; in the above 2, when the period of the target base station 21 transmitting the synchronization frame 1 is the same as the period of the source base station 21 transmitting the synchronization frame 2, the period is predefined by a standard protocol, or the core network device instructs the terminal device that the period of the target base station 21 transmitting the synchronization frame is the same as the period of the source base station 21 transmitting the synchronization frame, that is, the terminal device 20 can know that the period of the target base station 21 transmitting the synchronization frame is the same as the period of the source base station 21 transmitting the synchronization frame, and does not know whether the interval between the starting time of the target base station 21 transmitting the synchronization frame and the starting time of the source base station 21 transmitting the synchronization frame is greater than a preset value, and the terminal device 20 receives the synchronization frame transmitted by the target base station 21; in the case of the above 3, the terminal device 20 does not need to be specified by the standard protocol or instructed by the core network device to the terminal device 20, that is, the terminal device 20 cannot know whether the period of the synchronization frame transmitted by the target base station 21 is the same as the period of the synchronization frame transmitted by the source base station 21, and the terminal device 20 receives the synchronization frame transmitted by the target base station 21 in the above manner.

Based on the description in the fourth embodiment, the WUR interface 201 of the terminal device 20 may be continuously activated or activated at certain time intervals. When the WUR interface 201 of the terminal device 20 is continuously in an active state, no matter which transmission method the target base station 21 transmits the synchronization frame, the terminal device 20 can receive the synchronization frame transmitted by the target base station 21 through the WUR interface 201 within the first window duration. However, in the case where the WUR interface 201 of the terminal device 20 is activated at certain time intervals, when the target base station 21 uses different transmission schemes, the terminal device 20 needs to use different reception schemes, which will be described below.

First, with respect to the mode 1, since the period of the target base station 21 transmitting the synchronization frame is the same as the period of the source base station 21 transmitting the synchronization frame, and the interval between the start time of the target base station 21 transmitting the synchronization frame and the start time of the source base station 21 transmitting the synchronization frame is smaller than the first window duration, the terminal device 20 can always receive the synchronization frame transmitted by the target base station 21 through the WUR interface 201 within the first window duration. The specific example is the same as the example in the first embodiment, and details are not described herein.

Second, with respect to the method 2, since the period of the target base station 21 transmitting the synchronization frame is the same as the period of the source base station 21 transmitting the synchronization frame, and the interval between the starting time of the target base station 21 transmitting the synchronization frame and the starting time of the source base station 21 transmitting the synchronization frame is larger than the first window duration, the terminal device 20 may not receive the synchronization frame transmitted by the target base station 21 within the first window duration.

In this case, the terminal device 20 may control the duration of the activation state of the WUR interface 201 to be a first duration, which is longer than the first window duration, so as to receive the first synchronization frame transmitted by the target base station 21 through the WUR interface 201 within the first duration, where the first synchronization frame may be a first synchronization frame transmitted by the target base station 21, and a second synchronization frame, and is not particularly limited herein. In this embodiment, after the terminal device 20 receives the first synchronization frame sent by the target base station 21, according to the time of receiving the first synchronization frame sent by the target base station 21, the duration of the activation state of the WUR interface 201 is adjusted to be a second duration smaller than the first duration, so as to receive a subsequent synchronization frame sent by the target base station 21 within the second duration, where the second duration is the duration of an awake window of the WUR interface 201 in the current serving cell after the terminal device 20 selects the target serving cell as the current serving cell. Of course, the terminal device 20 may also adjust the start time of the awake window of its WUR interface 201 in the current serving cell according to the time of receiving the first synchronization frame of the current serving cell. The specific example is the same as the example in the second embodiment, and details are not described herein.

Third, regarding the method 3, since the period of the target base station 21 transmitting the synchronization frame is different from the period of the source base station 21 transmitting the synchronization frame, the interval between the starting time of the target base station 21 transmitting the synchronization frame and the starting time of the source base station 21 transmitting the synchronization frame is greater than the first window duration, and thus the terminal device 20 may not be able to receive the synchronization frame transmitted by the target base station 21 within the first window duration.

In the third embodiment, since the terminal device 20 cannot know the period of the target base station 21 sending the synchronization frame in advance, in order to ensure that the subsequent synchronization frame sent by the target base station 21 can be correctly received, the terminal device 20 needs to determine the period of the target base station 21 sending the synchronization frame.

As an example, the terminal device 20 determines the period of the target base station 21 sending the synchronization frame according to the time of receiving the first synchronization frame sent by the target base station 21, or according to the time of receiving the first synchronization frame sent by the target base station 21 and the time of receiving the second synchronization frame sent by the target base station 21, and further adjusts the duration of the active state of the WUR interface 201 to a fourth duration less than the third duration according to the calculated period and the time of receiving the subsequent synchronization frame sent by the target base station 21, and receives the subsequent synchronization frame sent by the target base station 21 within the fourth duration, where the fourth duration is the duration of the awake window of the WUR interface 201 in the current serving cell after the terminal device 20 selects the target serving cell as the current serving cell. Of course, the terminal device 20 may also adjust the start time of the awake window of its WUR interface 201 in the current serving cell according to the time of receiving the first synchronization frame of the current serving cell, or according to the time of receiving the first synchronization frame and the second synchronization frame of the current serving cell and the synchronization frame transmission period of the current serving cell. The specific example is the same as the example in the third embodiment, and details are not described herein.

As another example, the synchronization frame sent by the target base station 21 further includes period information of the synchronization frame sent by the target base station 21, so that after receiving the first synchronization frame sent by the target base station 21, the terminal device 20 can determine the arrival time of the next synchronization frame sent by the target base station 21 according to the time of receiving the first synchronization frame sent by the target base station 21, and dynamically adjust the duration of the active state of the WUR interface 201 to a sixth duration less than the fifth duration according to the time, so as to receive the subsequent synchronization frame sent by the target base station 21 within the sixth duration, where the sixth duration is the duration of the awake window of the WUR interface 201 in the current serving cell after the terminal device 20 selects the target serving cell as the current serving cell. Of course, the terminal device 20 may also adjust the start time of the awake window of its WUR interface 201 in the current serving cell according to the time of receiving the first synchronization frame of the current serving cell. The specific example is the same as the example in the third embodiment, and details are not described herein.

S74: the terminal device 20 obtains the identification information of the TA to which the target serving cell belongs from the synchronization frame;

s75: the terminal device 20 determines whether TA update is required according to the identification information of the TA to which the target serving cell belongs, and keeps the main communication interface of the terminal device in a closed state when the TA update is not required.

In this embodiment of the present application, after the terminal device 20 obtains the identification information of the TA to which the target serving cell belongs from the synchronization frame, the terminal device determines whether to perform TA update according to the identification information of the TA to which the target serving cell belongs, and a specific TA update process is the same as the TA update process in the embodiment shown in fig. 4, which is not described herein again.

The embodiment of the application provides a data transmission method, which is specifically described as follows:

in the scenario shown in fig. 12, a base station (a network device) may perform data transmission with a User Equipment (UE) (also referred to herein as a terminal device). The base station can send wake-up signals, such as wake-up frames and synchronization frames; the UE is configured with a WUR module and a host communication module, and can receive a wake-up signal transmitted by the base station through the WUR module. From the aspect of product morphology, the base station or the UE may transmit the wake-up signal. Fig. 5C is an example of a base station transmitting a wake-up signal. The scenario involved in the present invention is a scenario in which the IDLE-state UE moves to the edge of the current serving cell and cell reselection occurs as shown in fig. 13, and the situation of each cell is shown in fig. 12, that is, the base station of each cell can send a wake-up signal.

Assuming that the UE is configured with a Wake-up Radio (WUR) interface, when the UE is in an IDLE (IDLE) state, the UE may turn off a main communication interface (e.g., LTE/NR interface) and turn on the WUR interface. The WUR may be continuously active or may operate in an intermittent mode of operation as shown in fig. 3.

After the UE introduces the WUR interface, the base station may send a sync frame in addition to the wake-up frame, which is also a kind of wake-up signal that can be received by the WUR interface of the UE. The WUR sync frame may also be referred to as a WUR Beacon (Beacon) frame, or sync frame or Beacon frame for short. The role of the synchronization frame includes one or more of the following:

and the UE can execute the measurement process based on the synchronous frame under the conditions that the main communication interface is closed and the WUR interface is opened. For example, the UE determines whether cell reselection needs to be performed based on measurements of synchronization frames. Therefore, the UE does not need to open the primary communication to receive the PSS/SSS and the cell reference signal, and the purpose of saving power is achieved.

If the WUR of the UE works in an intermittent working mode, the UE needs to keep timing synchronization with the base station based on the receiving of the synchronization frame, so that the wakeup window of the UE cannot miss possible wakeup frames due to overlarge clock drift.

Suppose that the UE determines to perform cell reselection based on receiving the synchronization frame of the original serving cell, and determines a new serving cell by receiving the synchronization frame of the target cell. At this time, the UE may open the primary communication interface and determine a new serving cell identity through reception of a new serving cell synchronization signal and a system message (the new serving cell identity needs to be determined through reception of the PSS/SSS and the MIB), thereby completing cell reselection. The UE may then turn on the primary communication interface to receive a system message (e.g., SIB1) for the new serving cell to determine the TAI of the new serving cell in order to decide whether a TA update procedure needs to be performed. In the above process, the UE needs to open the primary communication interface to receive the PSS/SSS and the system message (MIB & SIB1), which obviously consumes more power.

Based on the above reasons, the basic idea of the solution proposed by the present invention to reduce the power consumption of the UE is: and the base station sends a WUR synchronization frame which carries the TA identification information of the base station. Thus, after the UE performs cell reselection, the UE can determine whether to move out of the cell included in the TA List stored in the UE according to the received WUR synchronization frame of the new serving cell without opening the primary communication interface to receive the SIB1 of the new serving cell to obtain the TAI of the new serving cell, and further determine whether to open the primary communication interface to perform the TA update procedure.

The scheme of the invention ensures that the IDLE state UE can complete cell reselection, acquisition of TA to which the new service cell belongs and judgment on whether a TA updating process needs to be executed or not without activating a main communication interface, thereby ensuring that the UE saves more electricity.

The WUR synchronization frame sent by the base station may also include base station identification information or cell identification information. Thus, when the UE performs cell reselection, the UE may obtain the identifier of the new serving cell only by receiving the WUR synchronization frame of the new serving cell without opening the primary communication interface to receive the PSS/SSS and the MIB of the new serving cell to obtain the identifier of the new serving cell, thereby completing cell reselection. It should be noted that the WUR synchronization frame sent by the base station includes cell identification information and TA identification information, which are independent from each other, i.e., the WUR synchronization frame may include either one of the cell identification information and the TA identification information, or both of them.

As shown in fig. 12, WUR Beacon is a WUR sync frame, TA ID is TA identification information of a TA to which a Cell transmitting WUR Beacon belongs, and Cell ID is Cell identification information of the Cell transmitting WUR Beacon.

Therefore, by carrying the TA identification information and the cell identification information in the WUR synchronization frame, the IDLE-state UE can complete cell reselection without activating a main communication interface in the moving process, and the power consumption of the UE is reduced. And only when the UE judges that the UE moves out of the cell included in the TA List configured for the UE by the network side according to the TA identification information carried by the WUR synchronization frame of the new service cell, the main communication interface is required to be opened to execute the TA updating process. The signaling interaction flow of the IDLE-state UE performing the TA update procedure through the new serving cell is shown in fig. 4. The process is the existing technology of the existing 3GPP standard, so the detailed process is not described again.

The TA identification information may be a TAI, a part of the TAI, or other information that is generated based on the TAI and is used to identify the TA to which the base station belongs. For example, the TAI is composed of a PLMN and a TAC, and the PLMN is used for identifying a network service operator, and considering that a frequency band in the same region is generally allocated to only one operator, the TA identification information may not include the PLMN but only include the TAC, so as to reduce the length of the TA identification information, thereby reducing the length of the WUR synchronization frame and saving overhead. The TA identity information may also be part of the TAC, such as the lower bits of the TAC. Similarly, the Cell identification information may be a PCI (Physical-layer Cell Identity) in the current standard, may be a part of the PCI, or may be other information that is generated based on the PCI and can be used to identify a base station or a Cell.

The WUR sync frame for each cell is regularly transmitted by the base station. For example, the WUR sync frame is periodically transmitted by the base station, and the transmission period may be configured by the base station or predefined by the standard. In the former case, the base station may configure the cycle of the WUR synchronization frame through upper layer information such as RRC, system message, MAC CE, and the like, or through physical layer signaling such as DCI and the like. The base station may also configure the time and/or frequency resources used to transmit the WUR sync frame, i.e., the time and/or frequency domain resource allocation of the WUR sync frame. In addition, the base station may also configure the start of time to transmit a WUR sync frame, i.e., the time to transmit the first WUR sync frame. Specifically, the time start may be represented by a time offset. For example, the time offset may be a time interval between the first WUR sync frame and the base station configuration information.

The transmission periods of the WUR sync frames for different cells may be the same or different. In the case where the WUR sync frame transmission periods of different cells are the same, the WUR sync frame transmission times of different cells may be approximately the same or have a time offset. If the WUR of the UE is in a continuous activation state, the UE can always receive the WUR synchronization frame of other cells through the WUR and judge the WUR synchronization frame sending period of the cell based on at least two received WUR synchronization frames of the same cell. However, if the UE adopts the intermittent active mode as shown in fig. 3, the method for the UE to listen to the WUR synchronization frame of another cell is different:

case 1: assuming that the WUR synchronization frame transmission periods of different cells are the same and the WUR synchronization frame transmission timings of different cells are also substantially the same, as shown in fig. 5A;

the WUR sync frame transmission timing of different cells may be identical, but in this case the WUR sync frames of adjacent cells tend to interfere with each other. Therefore, the WUR synchronization frame transmission timings of different cells can be configured to be substantially the same. E.g., all located in the same subframe, but occupying different mini-slots. Specifically, "substantially the same" means that the offset between the WUR sync frame transmission times of neighboring cells does not exceed the UE's awake window duration. This may be achieved through coordination between the base stations. Because the adjacent cells have approximately the same time for sending the WUR synchronous frames, the UE can receive the WUR synchronous frames of other cells in the self wake-up window, and a new serving cell is determined based on the measurement of the WUR synchronous frames and the cell reselection is completed.

Case 2: it is assumed that the WUR synchronization frame transmission periods of different cells are the same, but there is a large offset between the WUR synchronization frame transmission occasions of different cells, as shown in fig. 5B;

the "large offset" here means that the offset between the WUR sync frame transmission times of the neighboring cells exceeds the awake window duration of the UE. In this case, when the UE finds that the original serving cell signal is weak and needs to perform cell reselection, the WUR synchronization frames of other cells cannot be heard in the awake window. At this time, the UE may keep its own WUR interface in an active state for a period of time (not less than a transmission period of the WUR sync frame) to receive the WUR sync frames of other cells, and then determine a new serving cell according to the measurement of the WUR sync frames of other cells. Since the transmission periods of the WUR sync frames of different cells are the same, the UE can determine the transmission time of the subsequent WUR sync frame based on the received WUR sync frame of the new serving cell.

Case 3: suppose that the WUR synchronization frame transmission periods of different cells are different, and there is a large offset between the WUR synchronization frame transmission occasions of different cells, as shown in fig. 5C;

"Large offset" is defined as Case 2. In this Case, like Case 2, the UE needs to keep its WUR interface active for a while in order to receive WUR synchronization frames of other cells in order to complete cell reselection. However, since the WUR sync frame transmission periods of different cells are different and the UE does not know the WUR sync frame transmission period of the new serving cell, there are two methods for the UE to obtain the WUR sync frame transmission period of the new serving cell. One method is that the WUR interface of UE keeps activated for a long time until receiving at least two WUR synchronization frames from a new service cell, and the UE can obtain the sending period of the new service cell and further the sending time of the subsequent synchronization frame based on the distance between two adjacent WUR synchronization frames; in another method, the WUR synchronization frame sent by the base station carries its own WUR synchronization frame sending period, so that the UE receiving a WUR synchronization frame of a new serving cell can determine the sending time of the subsequent synchronization frame according to the carrying sending period. The second method makes the WUR interface of the UE not need to keep active for a long time (only one WUR sync frame of a new serving cell is received), but causes the WUR sync frame to become long, and the indication overhead becomes large.

If the standard predefines that the WUR synchronous frames of different cells have the same sending period and the sending time is approximately the same, or the network side indicates the information, the UE acquires the WUR synchronous frames of other cells by adopting a Case1 method; if the sending periods of the WUR synchronous frames of different cells are predefined to be the same by the standard or the network side indicates the information, but the UE does not determine whether the sending times of different cells are approximately the same, the UE acquires the WUR synchronous frames of other cells by adopting a Case 2 method; if the UE cannot determine whether the WUR synchronous frames of different cells have the same transmission period and the same transmission time, the UE acquires the WUR synchronous frames of other cells by adopting a Case 3 method.

The method for acquiring the WUR synchronization frame of other cells is suitable for the situation that different cells adopt the same carrier frequency to transmit the WUR synchronization frame, namely, the UE does not need to perform frequency domain switching when receiving the WUR synchronization frame. If carrier frequencies of WUR synchronization frames sent by different cells are different, but a standard predefines a set of carrier frequencies which can be used for sending the WUR synchronization frames, the UE can alternately sense each potential carrier frequency which can send the WUR synchronization frames (namely, the potential carrier frequency stays for a period of time), and corresponding operation is executed on each potential carrier frequency according to the three conditions (Case 1-Case 3) so as to receive the WUR synchronization frames of the adjacent cells and relevant configuration information (the sending period, time offset and the like of the WUR synchronization frames).

The following describes the apparatus provided by the embodiments of the present application with reference to the drawings.

Fig. 8 shows a schematic structural diagram of a terminal device 800. The terminal device 800 may include a receiving unit 801 and an obtaining unit 802, where the receiving unit 801 may be configured to perform S42 in the embodiment shown in fig. 4 and/or S73 in the embodiment shown in fig. 7. The obtaining unit 702 may be configured to perform S43 in the embodiment shown in fig. 4, and/or S74 in the embodiment shown in fig. 7. All relevant contents of each step related to the above method embodiment are the same as the functional description that can be cited to the corresponding functional module, and are not described herein again.

Fig. 9 shows a schematic structural diagram of a network device 900. The network device 900 may include a generating unit 901 and a transmitting unit 902, wherein the generating unit 901 may be configured to execute S41 in the embodiment shown in fig. 4 and/or S71 in the embodiment shown in fig. 7. The sending unit 902 may be configured to perform S42 in the embodiment shown in fig. 4, and/or S72 in the embodiment shown in fig. 7. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

Fig. 10 shows a schematic structural diagram of a terminal device 1000. The terminal device 1000 can include a wake up radio WUR interface 1001, a processor 1002, the WUR interface 1001 coupled to the processor 1002. The processor 1002 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), one or more Integrated circuits for controlling program execution, a baseband chip, or the like.

The terminal device 1000 can also include a memory 1003 and a main communication interface 1004, the memory 1003 and the main communication interface 1004 being respectively coupled to the processor 1002. The number of the memories may be one or more, and the memories may be Read Only Memories (ROMs), Random Access Memories (RAMs), or magnetic disk memories, etc.

By programming the processor 1002, the code corresponding to the method for obtaining the identifier information of the tracking area TA of the cell reselection target serving cell is solidified in the chip, so that the chip can execute the method for obtaining the identifier information of the tracking area TA of the cell reselection target serving cell according to the embodiment shown in fig. 4 or fig. 7 when running, and how to program the processor 1002 is a technique known by those skilled in the art, and is not described herein again.

Fig. 11 shows a schematic structural diagram of a network device 1100. The network device 1100 may include a processor 1101 and a transmitter 1102, the transmitter 1102 being coupled to the processor 1101. The processor 1101 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), one or more Integrated circuits for controlling program execution, a baseband chip, or the like. The transmitter 1102 may be used as a host communication interface for transceiving host communication interface signals, and may also be used as a WUR interface for transmitting wake-up signals.

The network device 1100 may also include a memory 1103, the memory 1103 coupled to the processor 1101. The number of the memories may be one or more, and the memories may be Read Only Memories (ROMs), Random Access Memories (RAMs), or magnetic disk memories, etc.

By programming the processor 1101, the code corresponding to the method for obtaining the identification information of the tracking area TA of the cell reselection target serving cell is solidified in the chip, so that the chip can execute the method for obtaining the identification information of the tracking area TA of the cell reselection target serving cell provided in the embodiment shown in fig. 4 or fig. 7 when running, and how to program the processor 1101 is a technique known by those skilled in the art, and is not described herein again.

The present application also provides a computer storage medium, which may include a memory, where the memory may store a program, and the program includes all the steps executed by the terminal device or all the steps executed by the network device in the method embodiments described in fig. 4 or fig. 7.

Embodiments of the present application also provide a computer program product, which, when called by a computer, can make the computer execute the method provided by the method embodiments shown in fig. 4 or fig. 7.

Embodiments of the present application further provide a chip system, where the chip system includes a processor, and is configured to support a terminal device or a network device to implement the method provided in the embodiments shown in fig. 4 or fig. 7, for example, to generate or process data and/or information involved in the method provided in the embodiments shown in fig. 4 or fig. 7. The chip system also comprises a memory, the memory is used for storing necessary program instructions and data of terminal equipment or network equipment, and a processor in the chip system can call the program instructions and data stored in the memory in the chip system, so that the chip system can realize the functions of the terminal equipment or the network equipment. The chip system may be formed by a chip, or may include a chip and other discrete devices.

An embodiment of the present application further provides a communication system, which includes the terminal device 1000 provided in the embodiment shown in fig. 10 and the network device 1100 provided in the embodiment shown in fig. 11.

The network element related to the present invention includes a base station (e.g., a gbb, generation Node B, i.e., a base station referred to in the 5G NR standard) and a user equipment UE.

Referring to fig. 14, a base station 1400 includes: a processor 1401, a memory 1402, a transceiver 1403, and a bus 1404. The transceiver 1403 serves as a host communication interface for transceiving host communication interface signals (e.g., LTE/NR signals) and also serves as a WUR interface for transmitting wake-up signals, among other things. Wherein the processor 1401, the memory 1402 and the transceiver 1403 are connected to each other by a bus 1404. The bus 1404 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus 1404 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 14, but this is not intended to represent only one bus or type of bus. In some further embodiments, the base station 1400 shown in fig. 14 includes a transceiver 1403 and a transmitter 1405, wherein the transceiver 1403 is used as the primary communication interface for transceiving primary communication interface signals (e.g., LTE/NR signals) and the transmitter 1405 is used as the WUR interface for transmitting a wake-up signal.

Embodiments of the present invention also provide a non-volatile storage medium having one or more program codes stored therein, and when the processor 1401 of the base station 1400 executes the program codes, the base station 1400 executes the relevant method steps executed by the base station in any method embodiment of the present invention.

The detailed description of each module or unit and the technical effects brought by each module or unit after performing the related method steps performed by the base station in any method embodiment of the present invention can refer to the related description in the method embodiment of the present invention, and are not repeated herein.

Referring to fig. 15, a UE 1500 includes: a processor 1501, memory 1502, transceiver 1503, receiver 1505, and bus 1504. Therein, the transceiver 1503 serves as a main communication interface for transceiving main communication interface signals (e.g., LTE/NR signals), and the receiver 1505 also serves as a WUR interface for receiving wake-up signals. Wherein the processor 1501, the memory 1502, and the transceiver 1503 are interconnected by a bus 1504. The bus 1504 may be a PCI bus, an EISA bus, or the like. The bus 1504 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 15, but this is not intended to represent only one bus or type of bus.

An embodiment of the present invention further provides a non-volatile storage medium, where one or more program codes are stored in the non-volatile storage medium, and when the processor 1501 of the UE 1500 executes the program codes, the UE 1500 executes relevant method steps executed by the UE in any method embodiment of the present invention.

The detailed description of each module in the UE 1500 provided in the embodiment of the present invention and the technical effects brought by each module after performing the related method steps performed by the UE in any method embodiment of the present invention may refer to the related description in the method embodiment of the present invention, and are not described herein again.

The embodiment of the application provides a network device, and the network device has a function of realizing the behavior of the network device in the above method embodiments. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to respective sub-functions of the above-described functions. Alternatively, the network device may be a base station.

The embodiment of the application provides a terminal device, and the terminal device has a function of realizing the behavior of the terminal device in the above method embodiments. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to respective sub-functions of the above-described functions. Optionally, the terminal device may be a user equipment.

The embodiment of the present application further provides a communication system, which includes the network device and the terminal device described in the above embodiments.

Embodiments of the present application further provide a computer storage medium, configured to store computer software instructions for the network device, where the computer software instructions include a program designed to perform functions implemented by the network device in the foregoing embodiments.

The embodiment of the present application further provides a computer storage medium, configured to store computer software instructions for the terminal device, where the computer software instructions include a program designed to execute the functions implemented by the terminal device in the foregoing embodiments.

The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a computer, implements the method flows related to the terminal device in the above method embodiments. Specifically, the computer may be the terminal device described above.

Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a computer, implements the method flows related to the network device in the foregoing method embodiments. Specifically, the computer may be the network device described above.

It should be understood that the processor mentioned in the embodiments of the present invention may be a Central Processing Unit (CPU), and may also be other general purpose processors, Digital Signal Processors (DSP), Application Specific Integrated Circuits (ASIC), Field Programmable Gate Arrays (FPGA) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory referred to in this embodiment of the invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double data rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM).

It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should also be understood that the reference herein to first, second, and various numerical designations is merely a convenient division to describe and is not intended to limit the scope of the present application.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by their functions and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The relevant parts among the method embodiments of the invention can be mutually referred; the apparatus provided in the respective apparatus embodiments is adapted to perform the method provided in the respective method embodiments, so that the respective apparatus embodiments may be understood with reference to the relevant parts in the relevant method embodiments.

The device structure diagrams given in the device embodiments of the invention only show a simplified design of the corresponding devices. In practical applications, the apparatus may comprise any number of transmitters, receivers, processors, memories, etc. to implement the functions or operations performed by the apparatus in the embodiments of the apparatus of the present invention, and all apparatuses that can implement the present invention are within the scope of the present application.

The names of the message/frame/indication information, the module or the unit, etc. provided in the embodiments of the present invention are only examples, and other names may be used as long as the roles of the message/frame/indication information, the module or the unit, etc. are the same.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The word "if" or "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by instructing the relevant hardware through a program, which may be stored in a storage medium readable by a device and includes all or part of the steps when executed, such as: FLASH, EEPROM, etc.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that different embodiments may be combined, and the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention, and any combination, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for obtaining identification information of a Tracking Area (TA) of a cell reselection target serving cell, the method comprising:

the method comprises the steps that terminal equipment obtains a synchronization frame sent by network equipment of a target service cell and received through a wake-up radio frequency WUR interface, wherein the synchronization frame comprises identification information of a TA (timing advance) to which the target service cell belongs, and the target service cell is the service cell in which the terminal equipment is located after cell reselection;

the terminal equipment acquires the identification information of the TA to which the target serving cell belongs from the synchronous frame;

and the terminal equipment determines whether TA updating is needed according to the identification information of the TA to which the target service cell belongs, and keeps a main communication interface of the terminal equipment in a closed state when the TA updating is not needed.

2. The method of claim 1, wherein before the terminal device acquires the synchronization frame transmitted by the network device of the target serving cell received via the wake-up rf WUR interface, the method further comprises:

the terminal device receives a synchronization frame sent by each network device in N network devices of N candidate service cells through the WUR interface, wherein the candidate service cells are any one of the N candidate service cells, and N is an integer greater than or equal to 1;

the terminal equipment measures the first synchronous frame sent by each network equipment respectively to obtain N measuring results;

and the terminal equipment determines the target service cell from the N candidate service cells according to the N measurement results and records the target service cell as the current service cell.

3. The method of claim 2, wherein the WUR interface corresponds to a wake-up window determined by the terminal device in a source serving cell, wherein the wake-up window is a time window during which the WUR interface is active, and wherein a window duration of the wake-up window is a first window duration;

the terminal device receives the synchronization frame sent by each network device in the N network devices of the N candidate serving cells through the WUR interface, and the method includes:

the terminal equipment receives the synchronous frames respectively sent by each network equipment in the N network equipment through the WUR interface within the first window duration; or

The terminal equipment receives a first synchronization frame which is respectively sent by each network equipment in the N network equipment through the WUR interface within a first duration that the WUR interface is in the activated state; after the target service cell is determined, according to the time when the network equipment receiving the target service cell sends a first synchronization frame, adjusting the time length of the WUR interface in the activated state to be a second time length, and receiving a subsequent synchronization frame sent by the network equipment of the target service cell through the WUR interface in the second time length, wherein the first time length is longer than the first window time length, and the second time length is shorter than the first time length; or

The terminal equipment receives a first synchronization frame which is respectively sent by each network equipment in the N network equipment through the WUR interface within a third time length when the WUR interface is in the activated state; after the target serving cell is determined, adjusting the time length of the WUR interface in the activated state to be a fourth time length according to the time of receiving a first synchronization frame sent by the network equipment of the target serving cell or the time of receiving the first synchronization frame sent by the network equipment of the target serving cell and the time of receiving a second synchronization frame sent by the network equipment of the target serving cell, and receiving a subsequent synchronization frame sent by the network equipment of the target serving cell through the WUR interface within the fourth time length, wherein the third time length is greater than the first window time length, and the fourth time length is less than the third time length; or

The terminal equipment receives a first synchronization frame which is respectively sent by each network equipment in the N network equipment through the WUR interface within a fifth time length when the WUR interface is in the activated state; and after the target serving cell is determined, according to the time of receiving a first synchronization frame sent by the network equipment of the target serving cell and the period of sending the synchronization frame by the network equipment of the target serving cell included in the first synchronization frame, adjusting the time length of the WUR interface in the activated state to be a sixth time length, and receiving a subsequent synchronization frame sent by the network equipment of the target serving cell through the WUR interface in the sixth time length, wherein the fifth time length is greater than the first window time length, and the sixth time length is less than the fifth time length.

4. The method according to claim 1, wherein the terminal device determines whether TA update is required according to the identification information of the TA to which the target serving cell belongs, and when not required, the terminal device keeps a primary communication interface in a closed state, including:

and if the terminal equipment determines that the tracking area identification TAI indicated by the identification information of the TA to which the target serving cell belongs is in a TA list stored by the terminal equipment, keeping the main communication interface in a closed state.

5. The method of any of claims 1-4, wherein the synchronization frame further comprises cell identification information of the target serving cell.

6. A method for obtaining identification information of a Tracking Area (TA) of a cell reselection target serving cell, the method comprising:

the method comprises the steps that a network device generates a synchronous frame, wherein the synchronous frame comprises identification information of a TA (timing advance) to which a cell where the network device is located belongs;

and the network equipment sends the synchronization frame so that the terminal equipment can receive the synchronization frame by waking up the radio frequency WUR interface, acquire the identification information of the TA to which the cell of the network equipment belongs from the synchronization frame, determine whether TA updating is needed according to the identification information of the TA to which the cell of the network equipment belongs, and keep the main communication interface of the terminal equipment in a closed state when the TA updating is not needed.

7. The method of claim 6, wherein the network device transmitting the synchronization frame comprises:

and the network equipment sends the synchronous frame according to a preset period.

8. The method according to claim 7, wherein the synchronization frame further includes duration information of the preset period.

9. The method according to any of claims 6-8, wherein the synchronization frame further comprises cell identification information of the cell in which the network device is located.

10. A terminal device, comprising:

a wake-up radio frequency WUR interface for receiving or transmitting data;

the main communication interface is used for receiving or sending data and is in a closed state;

a processor, configured to obtain a synchronization frame sent by a network device of a target serving cell received through the WUR interface, where the synchronization frame includes identification information of a TA to which the target serving cell belongs, and the target serving cell is a serving cell in which the terminal device is located after cell reselection; acquiring identification information of the TA to which the target serving cell belongs from the synchronization frame; and determining whether TA updating is needed according to the identification information of the TA to which the target service cell belongs, and keeping the main communication interface in the closed state when the TA updating is not needed.

11. The terminal device of claim 10, wherein the processor is further configured to:

controlling the WUR interface to receive a synchronization frame sent by each of N network devices of N candidate service cells respectively, wherein the candidate service cells are any one of the N candidate service cells, and N is an integer greater than or equal to 1;

respectively measuring the first synchronization frame sent by each network device and received by the WUR interface to obtain N measurement results;

and determining a target service cell from the N candidate service cells according to the N measurement results, and recording the target service cell as a current service cell.

12. The terminal device of claim 11, wherein the WUR interface corresponds to a wake-up window determined by the terminal device in a source serving cell, the wake-up window is a time window in which the WUR interface is active, and a window duration of the wake-up window is a first window duration;

when receiving the synchronization frame respectively sent by each of the N network devices of the N candidate serving cells, the WUR interface is specifically configured to:

and receiving the synchronization frame respectively sent by each network device in the N network devices within the first window duration of the WUR interface.

13. The terminal device of claim 11, wherein the WUR interface corresponds to a wake-up window determined by the terminal device in a source serving cell of a source network device, the wake-up window being a time window in which the WUR interface is active, a window duration of the wake-up window being a first window duration;

when receiving the synchronization frame respectively sent by each of the N network devices of the N candidate serving cells, the WUR interface is specifically configured to: receiving a first synchronization frame sent by each network device in the N network devices within a first time length of the WUR interface in the activated state, wherein the first time length is longer than the first window time length;

the processor is further configured to adjust a duration of the WUR interface in the active state to be a second duration according to a time when the network device receiving the target serving cell sends the first synchronization frame after the target serving cell is determined, where the second duration is less than the first duration;

when receiving the synchronization frame sent by each network device of the N network devices, the WUR interface is further specifically configured to: and receiving a subsequent synchronization frame sent by the network equipment of the target serving cell reselected by the terminal equipment within the second time length.

14. The terminal device of claim 11, wherein the WUR interface corresponds to a wake-up window determined by the terminal device in a source serving cell of a source network device, the wake-up window being a time window in which the WUR interface is active, a window duration of the wake-up window being a first window duration;

when receiving the synchronization frame respectively sent by each of the N network devices of the N candidate serving cells, the WUR interface is specifically configured to: receiving a first synchronization frame sent by each network device in the N network devices within a third time length of the WUR interface in the activated state, wherein the third time length is greater than the first window time length;

the processor is further configured to, after the target serving cell is determined, adjust a duration of the WUR interface in the active state to a fourth duration according to a time of receiving a first synchronization frame sent by the network device of the target serving cell or a time of receiving a first synchronization frame sent by the network device of the target serving cell and a time of receiving a second synchronization frame sent by the network device of the target serving cell, where the fourth duration is smaller than the third duration;

when receiving the synchronization frame sent by each network device of the N network devices, the WUR interface is further specifically configured to: and receiving a subsequent synchronization frame sent by the network equipment of the target serving cell reselected by the terminal equipment within the fourth time.

15. The terminal device of claim 11, wherein the WUR interface corresponds to a wake-up window determined by the terminal device in a source serving cell of a source network device, the wake-up window being a time window in which the WUR interface is active, a window duration of the wake-up window being a first window duration;

when receiving the synchronization frame respectively sent by each of the N network devices of the N candidate serving cells, the WUR interface is specifically configured to: receiving a first synchronization frame respectively sent by each network device in the N network devices within a fifth time length of the WUR interface in the activated state, wherein the fifth time length is greater than the first window time length;

the processor is further configured to, after the target serving cell is determined, adjust a duration of the WUR interface in the active state to a sixth duration according to a time at which a first synchronization frame sent by the network device of the target serving cell is received and a synchronization frame sending period of the network device of the target serving cell included in the first synchronization frame, where the sixth duration is smaller than the fifth duration;

when receiving the synchronization frame sent by each network device of the N network devices, the WUR interface is further specifically configured to: and receiving a subsequent synchronization frame sent by the network equipment of the target serving cell reselected by the terminal equipment within the sixth time length.

16. A terminal device according to any of claims 10-15, characterized in that the terminal device further comprises a memory;

the processor, when determining whether TA update is needed according to the identification information of the TA to which the target serving cell belongs, and when not needed, keeping the primary communication interface in the closed state, is specifically configured to:

and if the tracking area identification TAI indicated by the identification information of the TA to which the target serving cell belongs is determined to be in the TA list stored in the memory, keeping the main communication interface in the closed state.

17. A network device, comprising:

a processor, configured to generate a synchronization frame, where the synchronization frame includes identification information of a tracking area TA to which a cell where the network device is located belongs;

and the transmitter is used for transmitting the synchronization frame so that the terminal equipment can receive the synchronization frame through a wake-up radio frequency WUR interface, acquiring the identification information of the TA to which the cell of the network equipment belongs from the synchronization frame, determining whether TA updating is needed according to the identification information of the TA to which the cell of the network equipment belongs, and keeping a main communication interface of the terminal equipment in a closed state when the TA updating is not needed.

18. The network device of claim 17, wherein the transmitter, when transmitting the synchronization frame, is specifically configured to:

and sending the synchronous frame according to a preset period.

19. The network device of claim 18, wherein the synchronization frame further comprises duration information of the preset period.

20. The network device of any of claims 17-19, wherein the synchronization frame further comprises cell identification information of a cell in which the network device is located.

21. A computer storage medium having stored thereon instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-9.