CN117835459A

CN117835459A - Communication method, terminal device, storage medium, chip system and product

Info

Publication number: CN117835459A
Application number: CN202410241742.7A
Authority: CN
Inventors: 张星逸
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2024-03-04
Filing date: 2024-03-04
Publication date: 2024-04-05

Abstract

The embodiment of the application provides a communication method, terminal equipment, a storage medium, a chip system and a product, and relates to the technical field of terminals. The method comprises the following steps: transmitting a Radio Resource Control (RRC) connection reestablishment completion message, wherein the RRC connection reestablishment completion message indicates a network device to transmit an RRC reconfiguration message to a terminal device; and under the condition that the RRC reconfiguration message is not received within a first preset time period, sending an RRC connection reestablishment request, wherein the RRC connection reestablishment request indicates the network equipment to send an RRC connection reestablishment response message to the terminal equipment. In this way, the RRC reconfiguration message which is continuously waited for the feedback of the network equipment is avoided, the influence of the RRC reconfiguration failure or the longer duration on the terminal equipment is reduced, and the normal communication of the user is quickly restored.

Description

Communication method, terminal device, storage medium, chip system and product

Technical Field

The present disclosure relates to the field of terminal technologies, and in particular, to a communication method, a terminal device, a storage medium, a chip system, and a product.

Background

In a mobile communication system, under the condition of poor communication quality, a radio link failure (RLF, radio Link Failure) phenomenon may occur in a terminal device (UE), and further communication failure of a talk channel may occur. In order to solve the problem of communication failure of the terminal device, a reestablishment procedure may generally be initiated.

A link reestablishment method is known, such as a radio resource control (Radio Resource Control, RRC) reestablishment (re-establishment) procedure. After the reestablishment procedure between the terminal device and the network device is completed, the network device needs to instruct the terminal device to perform RRC reconfiguration, where the RRC reconfiguration may instruct the terminal device to recover various radio bearer resources, such as SRB2 (signalling radio bearer, signaling radio bearer 2), DRB (Data Rate Bridge), and so on.

However, in some cases, the terminal device may not receive the RRC reconfiguration message. Under the condition that the terminal equipment cannot receive the RRC reconfiguration message, the terminal equipment cannot recover the radio bearer resources, communication interruption is caused, and user experience is reduced.

Disclosure of Invention

The embodiment of the application provides a communication method, terminal equipment, a storage medium, a chip system and a product, which are applied to the technical field of terminals. By starting the RRC reestablishment procedure in time, normal communication can be quickly restored.

In a first aspect, an embodiment of the present application proposes a communication method. The method may be performed by the terminal device or may be performed by a component (e.g., a chip or a circuit) configured in the terminal device. The present application is not limited in this regard. The method comprises the following steps:

Transmitting a Radio Resource Control (RRC) connection reestablishment completion message, wherein the RRC connection reestablishment completion message instructs the network equipment to transmit an RRC reconfiguration message to the terminal equipment; and under the condition that the RRC reconfiguration message is not received within the first preset time period, sending an RRC connection reestablishment request, wherein the RRC connection reestablishment request indicates the network equipment to send an RRC connection reestablishment response message to the terminal equipment.

Alternatively, transmitting the RRC connection reestablishment complete message may refer to transmitting an RRC reestablishment request message to the network device reestablishing the cell. The network device reestablishing the cell allows the request of the terminal device, and the network device reestablishing the cell sends an RRC reestablishment response message to the terminal device. The terminal device may also send an RRC reestablishment complete message to the reestablished cell. The re-establishment cell may be one or more. Multiple re-established cells may also be referred to as a cell group.

Therefore, the terminal device sends an RRC connection reestablishment request to the network device, and the RRC reestablishment is started again. That is, in case that the RRC reconfiguration is not received within the first preset duration, the terminal device may initiate the RRC re-establishment again. Instead of continuously waiting for the RRC reconfiguration message fed back by the network device, the influence of the failure or longer duration of the RRC reconfiguration on the terminal device is avoided, the RRC reconfiguration of the terminal device is completed quickly, the RRC connection efficiency is improved, the normal communication of the user is restored quickly, and the user experience is improved.

Optionally, the first preset duration may include at least one of: the average reception duration of the RRC reconfiguration message, the maximum reception duration of the RRC reconfiguration message, the predetermined reception duration of the RRC reconfiguration message, or the predefined duration.

In addition, the first preset duration may also be an effective duration of the first timer.

In an optional embodiment of the first aspect, after sending the radio resource control RRC connection reestablishment complete message, the method further includes:

starting a first timer; the first preset duration is the effective duration of the first timer.

Alternatively, the first timer may be, for example, any one of a T300 timer, a T304 timer, a T310 timer, or a predefined timer.

In an optional embodiment of the first aspect, the sending the RRC connection reestablishment request if the RRC reconfiguration message is not received within a first preset duration includes:

in case the first timer expires and no RRC reconfiguration message is received, an RRC connection reestablishment request is sent.

The terminal device restrains the time length of the terminal device for receiving the RRC reconfiguration message through the time length of the first timer, so that the terminal device needs to receive the RRC reconfiguration message in the lower right time length of the first timer, and the situation that the communication time length of a user is too long and user experience is reduced due to too long waiting time for receiving the RRC reconfiguration message is avoided.

Optionally, the RRC connection reestablishment complete message instructs the first network device to send an RRC reconfiguration message to the terminal device. The RRC connection reestablishment request instructs the second network device to send an RRC connection reestablishment response message to the terminal device.

The second network device may be co-sited or off-sited with the first network device, as this application is not limited in this regard.

Wherein co-station may refer to the same network device, for example. For example, the first network device and the second network device may be the same base station, or the same Centralized Unit (CU) and the same and Distributed Units (DUs), or the same CU but different DUs. A foreign station may refer to a different network device, for example. For example, the first network device and the second network device may be different base stations, such as different CUs and different DUs. It should be understood that the specific form of the network device is not limited in this application.

And when the RRC reconfiguration message is not received within the first preset duration, the RRC reestablishment flow between the terminal equipment and the network equipment fails to execute, and if the RRC reestablishment flow for the network equipment with failed reestablishment is started again, the probability of reestablishment failure is higher.

In order to avoid that the terminal device selects the original network device again, a penalty value may be set for the signal strength of the original network device, so as to reduce the possibility of selecting the network device again. Thus, the method further comprises:

under the condition that the RRC reconfiguration message is not received within the first preset time period, determining that the target signal intensity of the reestablished cell is smaller than the measured signal intensity, wherein the first network equipment is the network equipment to which the reestablished cell belongs, the target signal intensity of the reestablished cell and the measured signal intensity of the neighbor cell are used for determining the reconnected target cell, and the second network equipment is the network equipment corresponding to the target cell.

The target signal intensity is smaller than that of the reestablished cell, the possibility that the reestablished cell participates in the network equipment again is reduced, the situation that the cell which fails to reestablish again initiates RRC reestablishment again is avoided, the success rate of the reestablishment can be effectively improved, the goal of rapidly completing RRC reestablishment is achieved, communication is timely restored for the terminal equipment, and user experience is improved.

In an alternative embodiment of the first aspect, reestablishing the target signal strength of the cell includes any one of:

Increasing the signal strength of the penalty value on the basis of the signal strength measured by the reconstructed cell;

multiplying the signal strength measured by the reconstructed cell by a preset proportion, wherein the preset proportion is a constant which is more than 0 and less than 1;

less than the signal strength measured by the neighbor cells.

It is understood that adding the signal strength of the penalty value on the basis of the signal strength measured by the re-established cell may refer to subtracting the absolute value of the penalty value from the re-established cell.

It should be understood that the signal strength obtained by multiplying the signal strength measured by the re-establishment cell by the preset ratio may refer to the signal strength corresponding to the product obtained by multiplying the signal strength measured by the re-establishment cell by the preset ratio.

It should be understood that the target signal strength is directly set to be smaller than the signal strength measured by the neighbor cell, so that the rapid setting of the target signal strength is realized, and the possibility that the cell with the failed reestablishment participates in reestablishment again is effectively reduced or avoided.

Different operations may be performed with respect to whether the RRC reconnection completion message terminal device is received within the first preset duration. Thus, in an alternative embodiment of the first aspect, the method further comprises:

And recovering the radio bearer resources with the network equipment under the condition that the RRC reconfiguration message is received in the first preset time period.

And under the condition that the RRC reconnection completion message is not received within the first preset time, the terminal equipment can recover the radio bearer resource between the terminal equipment and the network equipment under the condition that the RRC reconnection completion message is received within the first preset time correspondingly, so that the communication is recovered.

Alternatively, the terminal device may initiate the RRC reconnection again in case of failure to perform the RRC reconnection.

Thus, after sending the RRC connection reestablishment request, the method further comprises:

re-sending an RRC reestablishment completion message, wherein the re-sent RRC reestablishment completion message indicates the network equipment to re-send an RRC reconfiguration message;

and under the condition that the network equipment does not receive the RRC reconfiguration message sent again within the second preset time period, the RRC connection reestablishment request is sent again, and the second preset time period is longer than the first preset time period.

Alternatively, for the case of performing the RRC reestablishment procedure multiple times, for example, the RRC reestablishment procedure may be initiated for the first network device for the first time, the RRC reestablishment procedure may be initiated for the second network device for the second time, and the reestablishment procedure may be initiated for the third network device for the third time.

Thus, in an alternative embodiment of the first aspect, the retransmitted RRC reestablishment complete message is used to instruct the second network device to retransmit the RRC reconfiguration message;

the retransmitted RRC connection reestablishment request is used to instruct the third network device to transmit an RRC connection reestablishment response message to the terminal device.

In a second aspect, a communication device is provided comprising individual modules or units for performing the method of the first aspect and any of the possible implementations of the first aspect.

In a third aspect, a communication apparatus is provided that includes a processor. The processor is coupled to the memory and operable to execute instructions in the memory to implement the method of the first aspect and any one of the possible implementations of the first aspect. Optionally, the apparatus further comprises a memory. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface.

In one implementation, the communication device is a terminal device. When the processing means of the candidate cell configuration information is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the communication device is a chip configured in the terminal device. When the processing means of the candidate cell configuration information is a chip configured in the terminal device, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In a fourth aspect, there is provided a processor comprising: input circuit, output circuit and processing circuit. The processing circuitry is to receive signals through the input circuitry and to transmit signals through the output circuitry such that the processor performs the method of the first aspect and any one of the possible implementations of the first aspect.

In a specific implementation process, the processor may be one or more chips, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the output signal may be output by, for example and without limitation, a transmitter and transmitted by a transmitter, and the input circuit and the output circuit may be the same circuit, which functions as the input circuit and the output circuit, respectively, at different times. The embodiments of the present application do not limit the specific implementation manner of the processor and the various circuits.

In a fifth aspect, a processing device is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory and is configured to receive a signal via the receiver and to transmit a signal via the transmitter to perform the method of the first aspect and any one of the possible implementations of the first aspect.

Optionally, the processor is one or more and the memory is one or more.

Alternatively, the memory may be integrated with the processor or the memory may be separate from the processor.

In a specific implementation process, the memory may be a non-transient (non-transitory) memory, for example, a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips.

It should be appreciated that the related data interaction process, for example, transmitting the indication information, may be a process of outputting the indication information from the processor, and the receiving the capability information may be a process of receiving the input capability information by the processor. Specifically, the data output by the processor may be output to the transmitter, and the input data received by the processor may be from the receiver. Wherein the transmitter and receiver may be collectively referred to as a transceiver.

The processing means in the fifth aspect described above may be one or more chips. The processor in the processing device may be implemented by hardware or may be implemented by software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor, implemented by reading software code stored in a memory, which may be integrated in the processor, or may reside outside the processor, and exist separately.

In a sixth aspect, an embodiment of the present application provides a terminal device, including a processor, a memory, and a transceiver, where the transceiver is configured to receive and transmit data, the memory is configured to store code instructions, and the processor is configured to execute the code instructions, and when the code instructions stored in the memory are executed, instruct the terminal device to perform the method described in any one of the foregoing first aspect and any possible implementation manner of the first aspect.

In a seventh aspect, embodiments of the present application provide a computer-readable storage medium having stored therein a computer program or instructions which, when run on a computer, cause the computer to perform the method described in the first aspect and any one of the possible implementations of the first aspect.

In an eighth aspect, the present application provides a chip or chip system comprising at least one processor and a communication interface, the communication interface and the at least one processor being interconnected by wires, the at least one processor being adapted to execute a computer program or instructions to perform the method of the first aspect and any possible implementation of the first aspect. The communication interface in the chip can be an input/output interface, a pin, a circuit or the like.

In a ninth aspect, embodiments of the present application provide a computer program product comprising a computer program which, when run on a computer, causes the computer to perform the method of the first aspect and any one of the possible implementations of the first aspect.

In one possible implementation, the chip or chip system described above in the present application further includes at least one memory, where the at least one memory has instructions stored therein. The memory may be a memory unit within the chip, such as a register, a cache, etc., or may be a memory unit of the chip (e.g., a read-only memory, a random access memory, etc.).

It should be understood that, the second aspect to the ninth aspect of the present application correspond to the technical solutions of the first aspect of the present application, and the beneficial effects obtained by each aspect and the corresponding possible embodiments are similar, and are not repeated.

Drawings

Fig. 1 is a flowchart of RRC reestablishment according to an embodiment of the present application;

fig. 2 is a schematic architecture diagram of a communication system 100 applied in an embodiment of the present application;

fig. 3 is a signaling interaction diagram of a communication method provided in an embodiment of the present application from a device interaction point of view;

Fig. 4 is a signaling interaction diagram of yet another communication method provided by the embodiment of the present application, which is shown from the perspective of device interaction;

fig. 5 is a signaling interaction diagram of yet another communication method provided by the embodiment of the present application, which is shown from the perspective of device interaction;

fig. 6 is a signaling interaction diagram of yet another communication method provided by the embodiment of the present application, which is shown from the perspective of device interaction;

fig. 7 is a signaling interaction diagram of yet another communication method provided by the embodiment of the present application, which is shown from the perspective of device interaction;

fig. 8 is a flowchart of a communication method provided in an embodiment of the present application;

fig. 9 is a signaling interaction diagram of yet another communication method provided by the embodiment of the present application, which is shown from the perspective of device interaction;

fig. 10 is a signaling interaction diagram of yet another communication method provided by the embodiment of the present application, which is shown from the perspective of device interaction;

fig. 11 is a schematic block diagram of a communication device provided in an embodiment of the present application;

fig. 12 is a schematic diagram of a possible structure of a terminal device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a possible primary cell network device provided in an embodiment of the present application, for example, may be a schematic structural diagram of a base station.

Detailed Description

In order to facilitate the clear description of the technical solutions of the embodiments of the present application, the following simply describes some terms and techniques related to the embodiments of the present application:

1. radio resource control (Radio Resource Control, RRC) reestablishment: the RLF phenomenon occurs due to some mobility management or underlying link failures of the terminal Equipment (UE), and the UE may initiate a procedure for re-establishing air interface resources to continue RRC connection of the air interface. The reestablishment is a process of recovering the air interface when the air interface is abnormal under the connection state of the UE.

A flow chart of RRC re-establishment is briefly described in fig. 1 below. The RRC reestablishment procedure may specifically include steps 101 to 104 below.

Step 101, the terminal device sends an RRC reconnection request to the network device. Accordingly, the network device may receive the RRC reconnection request.

Step 102, the network device sends an RRC reconnection response message to the terminal device. Accordingly, the terminal device may receive the RRC reconnection response message.

Step 103, the terminal device sends an RRC reconnection completion message to the network device.

Step 104, the terminal equipment waits for receiving the RRC reconfiguration message sent by the network equipment.

Alternatively, the terminal device may recover radio bearer resources such as radio signaling bearer (Signaling Radio Bearer, SRB) 2, data Radio Bearer (DRB) and so on for normal communication in case of receiving the RRC reconfiguration message.

2. Cell (cell): the cells are described by a higher layer from the point of view of resource management or mobility management or service units. The coverage area of each network device may be divided into one or more cells, each cell may correspond to one or more frequency points, or each cell may be considered as an area formed by the coverage area of one or more frequency points.

It should be noted that a cell may be an area where a coverage area of a wireless network of a network device is located. In the embodiments of the present application, different cells may correspond to the same or different network devices. For example, the network device to which the cell #1 belongs and the network device of the cell #2 may be different network devices, such as a base station. That is, cell 1# and cell #2 may be managed by different base stations. Alternatively, for another example, the network device managing the cell #1 and the network device managing the cell #2 may also be different radio frequency processing units 1101 of the same base station, for example, remote radio units (radio remote unit, RRU), that is, the cell #1 and the cell #2 may be managed by the same base station, in particular, the same baseband processing unit 1101 and intermediate frequency processing unit 1101, but have different video processing units 1101. Alternatively, for another example, the network device to which cell 1# belongs and the network device to which cell 2# belongs may be the same network device, such as a base station. That is, the cell 1# and the cell 2# may be managed by the same base station, and in this case, may be referred to as co-sited with the cell 1# and the cell 2# without being particularly limited thereto in this application.

As before, the gNB (the next Generation Node B, next generation base station) may include CUs and DUs, among other possible deployments. In such a deployment, cell 1# and cell 2# may be managed by the same CU and the same DU, i.e., co-CU and co-DU; cell 1# and cell 2# may be managed by the same CU and different DUs, i.e. co-CU but not co-DU; cell #1 and cell #2 may also be managed by different CUs and different DUs, i.e. not co-CU and not co-DU.

3. Other terms

In the embodiments of the present application, the words "first," "second," and the like are used to distinguish between identical or similar items that have substantially the same function and effect. For example, the first chip and the second chip are merely for distinguishing different chips, and the order of the different chips is not limited. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

It should be noted that, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

The technical scheme of the present application will be described below with reference to the accompanying drawings.

The technical solution of the embodiment of the application can be applied to various communication systems, for example: long term evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (Frequency Division Duplex, FDD) system, LTE time division duplex (Time Division Duplex, TDD), universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS), worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, wiMAX) telecommunications system, future fifth generation (5th Generation,5G) telecommunications system or new radio access technology (new radio Access Technology, NR), vehicle-to-other devices (Vehicle-to-X V X), where V2X may include Vehicle-to-internet (Vehicle to network, V2N), vehicle-to-Vehicle (V2V), vehicle-to-infrastructure (Vehicle to infrastructure, V2I), vehicle-to-pedestrian (Vehicle to pedestrian, V2P), etc., workshop communication long term evolution technology (Long Term Evolution-Vehicle, LTE-V), vehicle networking, machine-type communications (Machine type communication, MTC), internet of things (Internet of Things, ioT), inter-Machine communication long term evolution technology (Long Term Evolution-Machine, LTE-M), machine-to-Machine (Machine to Machine, M2M), etc.

To facilitate an understanding of the embodiments of the present application, a communication system suitable for use in the embodiments of the present application will be described in detail with reference to fig. 2. Fig. 2 shows a schematic diagram of a communication system suitable for use in the communication method and the communication apparatus of the embodiments of the present application. As shown in fig. 2, the communication system 200 may include at least two network devices, such as network device 210 and network device 220 shown in fig. 2; the communication system 200 may also include at least one terminal device, such as the terminal device 230 shown in fig. 2. Wherein the terminal device 230 may be mobile or stationary. Both network device 210 and network device 220 are devices that can communicate with terminal device 230, such as base stations or base station controllers, etc., over a wireless link. Each network device may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area (cell).

Fig. 2 illustrates two network devices and one terminal device, alternatively, the communication system 200 may include at least one network device and may include other numbers of terminal devices within the coverage area of each network device, which is not limited in this embodiment of the present application.

Each of the above communication devices, such as the network device 210, the network device 220, or the terminal device 230 in fig. 2, may be configured with a plurality of antennas. The plurality of antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. In addition, each communication device may additionally include a transmitter chain and a receiver chain, as will be appreciated by those of ordinary skill in the art, each of which may include a plurality of components (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.) associated with the transmission and reception of signals. Thus, communication between the network device and the terminal device may be via antenna technology.

Optionally, the wireless communication system 200 may further include a network controller, a mobility management entity, or other network entities such as a core network element, which the embodiments of the present application are not limited to.

The terminal device of the embodiment of the application may include a handheld device, a vehicle-mounted device, and the like having a communication function. For example, some terminal devices are: a mobile phone, tablet, palm, notebook, mobile internet device (mobile internet device, MID), wearable device, virtual Reality (VR) device, augmented reality (augmented reality, AR) device, wireless terminal in industrial control (industrial control), wireless terminal in unmanned (self driving), wireless terminal in teleoperation (remote medical surgery), wireless terminal in smart grid (smart grid), wireless terminal in transportation security (transportation safety), wireless terminal in smart city (smart city), wireless terminal in smart home (smart home), cellular phone, cordless phone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication function, public computing device or other processing device connected to wireless modem, vehicle-mounted device, wearable device, terminal device in 5G network or evolving land mobile terminal (public land mobile network), and the like, without limiting the examples of this.

By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

In addition, in the embodiment of the application, the terminal device may also be a terminal device in an internet of things (internet of things, ioT) system, and the IoT is an important component of future information technology development, and the main technical characteristic of the terminal device is that the article is connected with a network through a communication technology, so that an intelligent network for man-machine interconnection and internet of things interconnection is realized.

The terminal device in the embodiment of the present application may also be referred to as: a terminal device, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, a user equipment, or the like.

In the embodiment of the application, the terminal device or each network device includes a hardware layer, an operating system layer running above the hardware layer, and an application layer running above the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like.

In this embodiment of the present application, the network device may be any device having a wireless transceiver function. The apparatus includes, but is not limited to: an evolved Node B (eNB), a radio network controller (Radio Network Controller, RNC), a Node B (Node B, NB), a base station controller (Base Station Controller, BSC), a base transceiver station (Base Transceiver Station, BTS), a Home base station (Home evolved NodeB, or a Home Node B, HNB, for example), a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (Wireless Fidelity, WIFI) system, a wireless relay Node, a wireless backhaul Node, a transmission Point (transmission Point, TP), or a transmission receiving Point (transmission and reception Point, TRP), etc., may also be 5G, e.g., NR, a gNB in a system, or a transmission Point (TRP or TP), one or a group (including multiple antenna panels) of base stations in a 5G system, or may also be a network Node constituting a gNB or a transmission Point, such as a BaseBand Unit (BBU), or a DU, etc.

In some deployments, the gNB may include CUs and DUs. The gNB may also include an active antenna unit (active antenna unit, AAU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB, e.g. the CU is responsible for handling non-real time protocols and services, implementing radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer functions. The DUs are responsible for handling physical layer protocols and real-time services, implementing the functions of the radio link control (radio link control, RLC), medium access control (media access control, MAC) and Physical (PHY) layers. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer may eventually become information of the PHY layer or be converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+aau. It is understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into network devices in an access network (radio access network, RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.

The network device may provide services for a cell, where the terminal device communicates with the cell through transmission resources (e.g. frequency domain resources, or spectrum resources) allocated by the network device, where the cell may belong to a macro base station (e.g. macro ENB or macro gNB, etc.), or may belong to a base station corresponding to a small cell (small cell), where the small cell may include: urban cells (metro cells), micro cells (micro cells), pico cells (pico cells), femto cells (femto cells) and the like, and the small cells have the characteristics of small coverage area and low transmitting power and are suitable for providing high-rate data transmission services.

The terminal device may establish an RRC connection with the network device, or cell, prior to normal communication. Referring to the system shown in fig. 2, an RRC connection exists between the terminal device 230 and the network device 210 or a cell corresponding to the network device 210, and thus, the terminal device 230 may perform a call or a data service through the network device 210.

In the case of poor signal quality, the terminal device 230 may initiate the reestablishment procedure when the RRC connection between the terminal device 230 and the network device 210 or the cell is broken or the signal strength is weak, that is, the terminal device 230 may initiate the reestablishment procedure to the network device 220, and perform the RRC reestablishment procedure shown in fig. 1. In the reestablishment procedure shown in fig. 1, the terminal device 230 needs to receive the reconfiguration message sent by the network device 220 in step 104, and after receiving the reconfiguration message, initiate a reconnection to the terminal device 220.

Currently, after the terminal device 230 sends the RRC reconnection completion message to the network device 220, it is required to wait for receiving the RRC reconfiguration message sent by the network device, and restart the bearer resources of the terminal device after the RRC reconfiguration message is received successfully. However, there is often a longer waiting time before the RRC reconfiguration message sent by the network device 220 is received. In the case that the terminal device 230 cannot receive the reconfiguration message sent by the network device 220, bearer resources such as SRB2 and DRB cannot be recovered in time, so that communication interruption still exists in the network device, which can affect the use experience of the user.

Therefore, how to control the terminal device to quickly complete the device connection under the conditions of too long receiving time of the reconfiguration message, failure in receiving the reconfiguration message, RLF, and the like, so as to solve the problem of low reconnection efficiency is a technical problem to be solved in the present technology. In this regard, the embodiment of the application provides a communication method, which has the main inventive concept as follows:

after the terminal device sends the RRC reconfiguration message to the network device, after sending the radio resource control RRC connection reestablishment complete message to the network device, the network device may receive the radio resource control RRC connection reestablishment complete message, and then prepare the RRC reconfiguration complete message that is fed back to the terminal device. The terminal device may agree on a receiving duration of the RRC reconfiguration message, that is, resend the RRC connection reestablishment request and initiate a second RRC reestablishment when the RRC reconfiguration message is not received within the first preset duration.

Therefore, under the condition that the RRC reconfiguration message is not received within the first preset duration, the RRC reestablishment can be executed again, so that the network equipment is instructed to send the RRC reconnection response message to the terminal equipment again, the phenomenon that the terminal equipment lacks the configuration of the bearing resources within a longer time because the RRC reconfiguration message waits for the reception time to be too long is avoided, and the communication obstacle of the terminal equipment is solved.

It should be noted that, after sending the RRC reestablishment complete message, the terminal device may start time monitoring at any time, and determine in time whether the RRC reconfiguration message is received within the first preset duration.

It should be noted that, after sending the RRC reestablishment completion message, the terminal device may also receive other configuration information sent by the network side, so as to implement configuration of other configuration information, so as to perform multiple configurations on the terminal device at the same time, and improve configuration efficiency of the terminal device.

The technical scheme shown in the application is described in detail through specific embodiments. It should be noted that the following embodiments may exist alone or in combination with each other. For the same or similar matters, for example, explanations belonging to or nouns, explanations concerning steps, and the like, reference may be made to each other in different embodiments, and the descriptions are not repeated.

Fig. 3 is a signaling interaction diagram of a communication method according to an embodiment of the present application. As shown in fig. 3, the communication method provided for this embodiment may include:

s301, sending a Radio Resource Control (RRC) connection reestablishment completion message, wherein the RRC connection reestablishment completion message indicates the network equipment to send an RRC reconfiguration message to the terminal equipment.

It should be appreciated that sending the RRC connection reestablishment complete message may also be described as transmitting the RRC connection reestablishment complete message or indicating a radio resource control, RRC, connection reestablishment complete message.

It should be understood that the RRC connection reestablishment complete message may also be described as an RRC reestablishment complete message, an RRC complete message, RRC reestablishment complete information, an RRC connection complete message, or RRC reestablishment complete information, etc. The RRC reconfiguration message may also be described as RRC reconfiguration information or RRC reconfiguration or the like.

Optionally, before the terminal device may send the RRC connection reestablishment complete message, the method may further include: and sending an RRC reconnection request to the network equipment. And receiving an RRC reconnection response message sent by the network equipment.

In this embodiment, sending the RRC connection reestablishment complete message may refer to sending an RRC reestablishment request message to the network device reestablishing the cell. The network device reestablishing the cell allows the request of the terminal device, and the network device reestablishing the cell sends an RRC reestablishment response message to the terminal device. The terminal device may also send an RRC reestablishment complete message to the reestablished cell. The re-establishment cell may be one or more. Multiple re-established cells may also be referred to as a cell group.

Here, reestablishing the cell may refer to a cell determined by the terminal device through cell search or detection. The re-established cell may be a cell that meets a predetermined criterion, such as the cell selection S criterion in NR protocol TS38.304-f 30. For brevity, detailed description is not provided herein. For the RRC reestablishment procedure and the specific procedure for determining the reestablishment of the cell by the terminal device, reference may be made to the prior art, and for brevity, will not be described in detail here.

Alternatively, the RRC connection reestablishment complete message may be transmitted or indicated through a medium access Control Element (Medium Access Control-Control Element, MAC-CE) signaling or RRC signaling or uplink Control information (Downlink Control Information, DCI).

That is, the terminal device may transmit the RRC connection reestablishment complete message through MAC-CE signaling, RRC signaling, or uplink control DCI. The network device may obtain the RRC connection reestablishment complete message from MAC-CE signaling, RRC signaling, or DCI.

S302, under the condition that the RRC reconfiguration message is not received within the first preset duration, an RRC connection reestablishment request is sent, and the RRC connection reestablishment request can instruct the network equipment to send an RRC connection reestablishment response message to the terminal equipment.

Alternatively, the failure to receive the RRC reconfiguration message within the first preset time period may also be described as a transmission timeout of the RRC reconfiguration message. That is, in the case of RRC reconfiguration timeout transmission, an RRC connection reestablishment request is sent.

In this embodiment, the RRC connection reestablishment request may be transmitted or indicated by a medium access control unit MAC-CE signaling or RRC signaling or uplink control information DCI.

That is, the terminal device may transmit the RRC connection reestablishment request through a medium access control unit MAC-CE signaling or RRC signaling or uplink control information DCI transmission. The network device may obtain the RRC connection reestablishment request through RRCMAC-CE signaling, RRC signaling, or DCI.

It should be noted that, the network device that initiates the RRC reestablishment procedure by the terminal device may be determined through cell search or detection. And when the terminal equipment initiates the RRC reestablishment process twice successively, the searched or detected cells can be the same cell. Therefore, the network device that transmits the RRC connection reestablishment response message in step 302 and the network device that receives the RRC connection reestablishment complete message or is instructed to transmit the RRC reconfiguration message in step 301 may be the same device or different devices.

It should be appreciated that there are several possibilities for the terminal device not to receive the RRC reconfiguration message: 1) The network device sends an RRC reconfiguration message, but the terminal device does not receive the RRC reconfiguration message. 2) The network device does not send an RRC reconfiguration message.

The above is only a scenario in which no RRC reconfiguration message is received, and is not particularly limited, and the present application does not limit the scenario in which the RRC reconfiguration message fails to be received too much.

It should be understood that the sending time of the RRC connection reestablishment request may be the time when the valid duration of the first preset duration ends, or may be the time after the valid duration of the first preset duration ends. For example, the transmission time of the RRC connection reestablishment request may be a time after a predetermined period of time is increased when the valid duration of the first preset duration ends. The length of the predetermined period of time may be any length, as this application is not limited thereto.

As can be seen from the above description, the terminal device sends the RRC connection reestablishment request to the network device, and the RRC reestablishment is started again. That is, in case that the RRC reconfiguration is not received within the first preset duration, the terminal device may initiate the RRC re-establishment again. Instead of continuously waiting for the RRC reconfiguration message fed back by the network device, the influence of the failure or longer duration of the RRC reconfiguration on the terminal device is avoided, the RRC reconfiguration of the terminal device is completed quickly, the RRC connection efficiency is improved, the normal communication of the user is restored quickly, and the user experience is improved.

It should be appreciated that the first preset time period may include at least one of: the average reception duration of the RRC reconfiguration message, the maximum reception duration of the RRC reconfiguration message, the predetermined reception duration of the RRC reconfiguration message, or the predefined duration.

The detection or determination of whether an RRC reconfiguration message is received within a first preset duration may be implemented by a timer, an alarm clock or a timer.

An example of how to determine whether the RRC reconfiguration message is received within the first preset time period will be described below.

1) Judging whether the RRC reconfiguration message is received within a first preset duration through a timer.

Alternatively, the timer may be started after the terminal device sends the radio resource control RRC connection reestablishment complete message. The failure to receive the RRC reconfiguration message within the first preset duration may mean that the RRC reconfiguration message is not received when the counted duration of the timer satisfies the first preset duration.

The fact that the time duration satisfies the first preset time duration may mean that the time duration is greater than or equal to the first preset time duration.

2) Judging whether an RRC reconfiguration message is received in a first preset duration or not through alarm clock software.

Optionally, after the terminal device sends the radio resource control RRC connection reestablishment complete message, alarm clock software may be started. The early warning duration set by the alarm clock software can be a first preset duration. The failure to receive the RRC reconfiguration message within the first preset duration may mean that the RRC reconfiguration message is not received within an early warning duration of the alarm clock software.

3) Judging whether the RRC reconfiguration message is received in the first preset time length or not through a timer.

Alternatively, the terminal device may start a timer after transmitting the transmission radio resource control RRC connection reestablishment complete message. The timing duration of the timer may be a first preset duration. The failure to receive the RRC reconfiguration message within the first preset duration may refer to failure to receive the RRC reconfiguration message if the timer expires.

In order to facilitate understanding of the scheme of the timer, the technical scheme of the application is described in detail by taking the timer as a first timer as an example. Fig. 4 is a signaling interaction diagram of a communication method according to an embodiment of the present application. As shown in fig. 4, in the communication method provided in this embodiment, after sending the RRC connection reestablishment complete message, the method may include:

s401, starting a first timer; the first preset duration is the effective duration of the first timer.

Alternatively, the first timer may be indicated by the network device. The terminal device may be configured to obtain first information, which may be used to indicate the first timer. Further, acquiring the first information may be described as receiving the first information or transmitting the first information.

In some embodiments, the first information may include at least one of: related information of the first timer, configuration information of the first timer and identification of the first timer. The related information may include at least one of: information such as the duration, identity, type and/or name of the timer. The configuration information may include at least one of: start information, running information and/or call information of the timer, etc. The identification of the timer may be information indicating the identification of the timer, such as a unique code (Identity document, ID) of the timer.

The following list a few possible examples of the first timer:

1. t300 timer

The T300 timer is an RRC connection setup timer. In an LTE network, T300 is used to monitor retransmissions of RRC connection requests. The timer T300 may start counting from the terminal device sending the RRC connection reestablishment complete message, and if the T300 timer expires, but the terminal device has not received the RRC reconfiguration message, then sending an RRC connection reestablishment request.

2. T304 timer

The timer T304 represents the duration of a timer used by the terminal device at the time of handover. In one implementation, the terminal device may configure T304 related information, such as the validity duration of T304. The timer T304 may start counting from the terminal device sending the RRC connection reestablishment complete message, and if T304 times out, but the terminal device has not received the RRC reconfiguration message, then sending an RRC connection reestablishment request.

3. T310 timer

The timer T310 is the time interval before the terminal device waits for downlink scheduling. The effective duration of T310 may be, for example, that the original network device previously issued to the terminal device through signaling, or may be predefined, which is not limited in this application. The terminal device starts a T310 timer when transmitting a radio resource control RRC connection reestablishment complete message. If the T310 timer expires, but the terminal device has not received the RRC reconfiguration message, then an RRC connection reestablishment request is sent.

4. Predefined timer

The predefined timer may be a timer predefined in the terminal device, the time interval of which may be adaptively determined. The predefined timer may be issued by the original network device through signaling or may be predefined at the terminal device, which is not limited in this application. The terminal device starts a predefined timer when sending a radio resource control RRC connection reestablishment complete message. If the predefined timer expires, but the terminal device has not received the RRC reconfiguration message, then an RRC connection reestablishment request is sent.

It should be noted that the first timer recited above is merely exemplary and should not be construed as limiting in any way.

S402, when the first timer expires and the RRC reconfiguration message is not received, an RRC connection reestablishment request is sent.

It should be appreciated that the expiration of the first timer and the failure to receive the RRC reconfiguration message may also be described as the failure to receive the RRC reconfiguration message within the effective duration of the first timer.

In addition, when the first timer times out and the RRC reconfiguration message is not received, the first timer is closed, and the power consumption of the terminal equipment can be saved by closing the first timer.

Optionally, if the RRC reconfiguration message is received without the first timer having timed out, the radio bearer resources are restored.

It should be understood that the sending time of the RRC connection reestablishment request may be the timing end time of the first timer, or may be any time after the timing end time of the first timer.

For example, the transmission time of the RRC connection reestablishment request may be a time after a predetermined period of time is increased for the timing end time of the first timer. The length of the predetermined period of time may be any length, as this application is not limited thereto.

As can be seen from the above description, the terminal device restricts the duration of receiving the RRC reconfiguration message by the first timer, so that the terminal device needs to receive the RRC reconfiguration message within the lower right duration of the first timer, so as to avoid that the duration of waiting for receiving the RRC reconfiguration message is too long, so that the communication duration of the user is too long, and user experience is reduced.

Alternatively, the RRC connection reestablishment complete message may instruct the first network device to send an RRC reconfiguration message to the terminal device. The RRC connection reestablishment request may instruct the second network device to send an RRC connection reestablishment response message to the terminal device.

Fig. 5 is a signaling interaction diagram of a communication method provided in the embodiment of the present application, and as shown in fig. 5, the method provided in the embodiment of the present application may include:

s501, the terminal equipment sends a radio resource control RRC connection reestablishment completion message to the first network equipment. Accordingly, the first network device may receive a radio resource control, RRC, connection reestablishment complete message.

It should be understood that the terminal device may initiate the reestablishment request to the different network devices twice in succession. The first network device may refer to a network device that is accessed before the terminal device performs RRC reconnection.

Optionally, the terminal device sends an RRC connection reestablishment complete message to the cell of the first network device. The manner in which the terminal device sends the RRC connection reestablishment complete message to the first network device may refer to the above description, which is not described herein.

It should be understood that the first network device may acquire/receive/obtain the RRC connection reestablishment complete message. The first network device may send an RRC reconfiguration message to the terminal device under the indication of the RRC connection reestablishment complete message. The first network device may not send the RRC reconfiguration message to the terminal device.

Alternatively, the first network device may send the RRC reconfiguration message through MAC-CE signaling RRC signaling or DCI. Accordingly, the terminal device may receive the RRC reconfiguration message through RRC signaling or DCI.

S502, the terminal equipment sends an RRC connection reestablishment request to the second network equipment under the condition that the terminal equipment does not receive the RRC reconfiguration message within the first preset time period.

Wherein co-station may refer to the same network device, for example. For example, the first network device and the second network device may be the same base station, or the same CU and the same DU, or the same CU but different DUs. A foreign station may refer to a different network device, for example. For example, the first network device and the second network device may be different base stations, such as different CUs and different DUs. It should be understood that the specific form of the network device is not limited in this application.

It should be understood that the case where the first network device and the second network device are out of station is illustrated in fig. 5, and will not be described herein.

The selection of the second network device will be illustrated below.

In an embodiment, the second network device is determined by a cell.

The second network device may be a network device corresponding to the cell determined by the terminal device through device search or detection. The terminal device may detect for camping on a cell and determine the cell to reconnect by cell search or detection. The reestablished cell may be a cell that meets a predetermined criterion, and the network device corresponding to the reestablished cell is a second network device.

In the second embodiment, the second network device is determined by device information of the device.

The device information may be, for example, at least one of: the communication capability of the network device, the distance between the network device and the terminal device, and the device model of the network device.

Alternatively, the terminal device may determine the second network device based on the communication capabilities of the network device. For example, the network device with the highest communication capability may be selected from the communication capabilities of the network devices as the second network device. For example, the network device with the highest communication capability and communication distance score may be selected as the second network device according to the communication capability and communication distance of the network device. For example, the network device with the latest device model may be selected as the second network device according to the device model of the network device.

It should be appreciated that the RRC connection reestablishment request may instruct the second network device to send an RRC connection reestablishment response message to the terminal device. Accordingly, the terminal device may receive the RRC connection reestablishment response message sent by the second network device.

It should be appreciated that after receiving the RRC connection reestablishment request, the second network device may send an RRC connection reestablishment response message to the terminal device in response to the RRC connection reestablishment request.

It should be understood that after receiving the RRC connection reestablishment response message, the terminal device may send a radio resource control RRC connection reestablishment complete message to the second network device again, so as to implement circulation of an RRC reestablishment procedure.

It should be understood that, when the second network device determines through the device information, it may determine, from the cells covered by the second network device, the cell in which the terminal device is located as the target cell. Further, it may be determined that a cell with the highest signal strength is a target cell from cells covered by the second network device.

As can be seen from the above description, after the terminal device sends the RRC connection reestablishment complete message to the first network device, if the RRC reconfiguration message is not received within the first preset duration, the terminal device may send the RRC connection reestablishment complete message to the second network device. I.e. in case of a reconfiguration failure of the first network device, initiate an RRC re-establishment to the second network device. And the RRC reestablishment is executed repeatedly, so that the RRC reestablishment efficiency can be improved, the resource recovery can be rapidly completed, safer communication quality can be provided for users, and the user experience can be improved.

In one possible design, the terminal device may determine a network device performing an RRC reconfiguration procedure. Specifically, the terminal device may determine the target cell according to the signal strength of the cell.

Therefore, in order to avoid that the terminal device reselects the original network device, the signal strength of the original network device may be set to a penalty value, so as to reduce the possibility of reselecting the network device. Fig. 6 is a signaling interaction diagram of a communication method provided in the embodiment of the present application, and as shown in fig. 6, the method provided in the embodiment of the present application may include:

s601, sending a Radio Resource Control (RRC) connection reestablishment completion message to the network equipment corresponding to the reestablished cell, wherein the RRC connection reestablishment completion message indicates the network equipment to send an RRC reconfiguration message to the terminal equipment.

The re-establishment cell may refer to a cell accessed by the terminal device when performing RRC reconnection. The re-establishment cell may be a cell covered by the network device accessed by the RRC reestablishment.

S602, under the condition that the RRC reconfiguration message is not received within a first preset time period, determining that the target signal strength of the reestablished cell is smaller than the measured signal strength, wherein the first network equipment is the network equipment to which the reestablished cell belongs, the target signal strength of the reestablished cell and the measured signal strength of the neighbor cell are used for determining the reconnected target cell, and the second network equipment is the network equipment corresponding to the target cell.

S603, sending an RRC connection reestablishment request to the network equipment corresponding to the target cell, wherein the RRC connection reestablishment request indicates the network equipment to send an RRC connection reestablishment response message to the terminal equipment.

It should be understood that, in this embodiment, the target signal strength of the reestablished cell may refer to the signal strength after the signal strength of the reestablished cell is updated. That is, the original measured signal strength of the reconstructed cell is reduced or decremented to obtain the target signal strength.

Alternatively, the re-established cell may be a cell covered by the first network device. A neighbor cell may refer to a cell that the terminal device is adjacent to. The terminal device may initiate an RRC reconnection to the neighbor cell.

It should be appreciated that the target cell may be a cell that initiates an RRC reconnection again. Under the condition that the terminal equipment fails to reestablish with the original reestablishment cell, the terminal equipment can initiate the RRC reestablishment procedure to the target cell again.

In some embodiments, reestablishing the target signal strength of the cell includes any one of:

1) And increasing the signal strength of the penalty value on the basis of the signal strength measured by the reconstructed cell.

2) And multiplying the signal strength measured by the reconstructed cell by a preset proportion, wherein the preset proportion is a constant which is more than 0 and less than 1.

3) Less than the signal strength measured by the neighbor cells.

It is understood that adding the signal strength of the penalty value on the basis of the signal strength measured by the re-established cell may refer to subtracting the absolute value of the penalty value from the re-established cell. The terminal device may detect the signal strength of the re-established cell. The penalty value may be a preset value, and may be a constant. The penalty value may be set to a negative number or to a positive number.

Optionally, when the penalty value is set to a negative number, the sum of the signal strength measured by the reestablished cell and the penalty value may be calculated to obtain the target signal strength. When the penalty value is set to a positive number, the difference of the measured signal strength of the reestablished cell minus the penalty value can be calculated to obtain the target signal strength.

Therefore, by setting the penalty value to reduce the signal strength of the reestablishment cell, the signal strength of the reestablishment cell can be directly reduced, and the update of the signal strength of the reestablishment cell can be rapidly completed.

Therefore, by multiplying the signal strength measured by the reestablished cell by the preset ratio, the signal strength measured by the reestablished cell can be reduced according to the ratio, so that the reduction of the signal strength is related to the measured signal strength ratio, and the signal strength has a relatively stable reduction trend under the condition of relatively large difference of the signal strengths.

The measured signal strengths above may be determined by an evaluation index. The evaluation index involved in the signal strength determination may include at least one of: reference signal received power (Reference Signal Receiving Power, RSRP) of the cell, reference signal received quality (reference signal received quality, RSRQ) of the cell, received signal strength indication (Received Signal Strength Indication, RSRI).

It should be appreciated that the signal strength of a cell may be determined by one evaluation index or may be obtained by weighted summation of a plurality of evaluation indexes. The signal strength of a cell may be obtained by weighted summation of RSRP and RSRI, for example. Or the signal strength of a cell may be determined directly from RSRQ. In this embodiment, the evaluation index of the signal strength of the cell is not limited to any particular value.

From the above, it is known that the reconnected target cell can be determined based on the target signal strength of the re-established cell and the signal strengths measured by the neighbor cells. The target signal intensity is smaller than that of the reestablished cell, the possibility that the reestablished cell participates in the network equipment again is reduced, the situation that the cell which fails to reestablish again initiates RRC reestablishment again is avoided, the success rate of the reestablishment can be effectively improved, the goal of rapidly completing RRC reestablishment is achieved, communication is timely restored for the terminal equipment, and user experience is improved.

Further, on the basis of any of the above embodiments, different operations may be performed with respect to whether the RRC reconnection completion message terminal apparatus is received within the first preset duration. Thus, fig. 7 shows a signaling interaction diagram of a communication method, which may include:

S701, a radio resource control RRC connection reestablishment complete message is sent.

S702, the terminal equipment restores radio bearer resources with the network equipment under the condition that the RRC reconfiguration message is received in a first preset time period.

Radio bearer resources may refer to entities and configurations required for data or message transmission between a terminal device and a network device. The radio bearer resources may include at least one of: signaling radio bearers (signalling radio bearer, SRB) 2, data radio bearers (Data Radio Bearer, DRBs).

After the radio bearer resources are recovered, the terminal device can recover normal communication through the radio bearer resources.

Therefore, under the condition that the terminal equipment receives the RRC reconfiguration message within the first preset time, the radio bearer resource between the terminal equipment and the first network equipment is recovered, namely, the normal communication with the network equipment is recovered through the RRC reestablishment flow, the communication resource is provided for the normal use of the terminal equipment by the user, and the user experience is improved.

The above mainly describes that, in a case where the RRC reconnection completion message is not received within the first preset duration, the terminal device may restore the radio bearer resources with the network device when the RRC reconnection completion message is received within the first preset duration, so as to restore communication.

Therefore, a judgment condition of whether the first preset time period starts the secondary reconnection or not. Fig. 8 shows a flowchart of a communication method provided in an embodiment of the present application, where, as shown in fig. 8, the method may include:

s801, a Radio Resource Control (RRC) connection reestablishment completion message is sent, and the RRC connection reestablishment completion message instructs the network equipment to send an RRC reconfiguration message to the terminal equipment.

S802, judging whether an RRC reconfiguration message is received within a first preset time period, if yes, executing step 803, and if not, executing step 804.

In this embodiment, the RRC reestablishment complete message may instruct the network device to send an RRC reconfiguration message to the terminal device.

Specifically, the RRC reestablishment complete message may instruct the first network device to send an RRC reconfiguration message to the terminal device.

S803, recovering the radio bearer resources with the network device.

Optionally, after recovering the radio bearer resources between the terminal device and the network device, the terminal device may communicate through the radio bearer resources to complete transmission of data or messages.

S804, an RRC connection reestablishment request is sent, and the RRC connection reestablishment request instructs the network equipment to send an RRC connection reestablishment response message to the terminal equipment.

In this embodiment, the RRC connection reestablishment request instructs the network device to send an RRC connection reestablishment response message to the terminal device, and may specifically instruct the second network device to send an RRC connection reestablishment response message to the terminal device.

As above, the terminal device may initiate an RRC reconnection again in case of failure to perform an RRC reconnection. The purpose of continuously initiating the RRC reconnection by the terminal equipment is to recover normal communication, so that the time waiting for receiving the RRC reconnection message can be increased for the condition of initiating the RRC reconnection again, thereby improving the probability of successful RRC reconnection and realizing the purpose of rapidly recovering user communication.

Fig. 9 shows a signaling interaction diagram of a communication method provided in the embodiment of the present application, where, as shown in fig. 9, the difference between the foregoing embodiment is that, in step 302, after sending an RRC connection reestablishment request in the case that an RRC reconfiguration message is not received within a first preset duration, the method may include:

step 901, the terminal device sends the RRC reestablishment complete message again. Accordingly, the network device may receive the retransmitted RRC reestablishment complete message.

Wherein the retransmitted RRC reestablishment complete message instructs the network device to retransmit the RRC reconfiguration message.

Optionally, before the terminal device sends the RRC reestablishment complete message again, the RRC reconnection response message sent by the network device may be received. Therefore, the terminal device may send the RRC reestablishment complete message again in case of receiving the RRC reconnection response message.

Step 902, retransmitting the RRC connection reestablishment request if the network device does not receive the RRC reconfiguration message for a second preset duration, where the second preset duration is longer than the first preset duration.

It should be understood that after the terminal device sends the RRC reestablishment complete message again, it goes into a process of waiting for the RRC reconfiguration message for the second time. The second preset duration may be a waiting duration of an RRC reconfiguration message set when the RRC reconnection is performed again.

It should be appreciated that the second preset duration may be determined by the first preset duration or directly indicated by the network device or preset.

In this embodiment, when the terminal device sends the RRC reestablishment complete message again, the second timer may be started. The effective duration of the second timer is a second preset duration. The failure to receive the RRC reconfiguration message sent again by the network device within the second preset duration may mean that the failure to receive the RRC reconfiguration message sent again by the network device is detected when the second timer expires.

It should be appreciated that the effective duration of the second timer is longer than the effective duration of the first timer. The effective duration of the second timer may be determined by the effective duration of the first timer.

The effective duration of the second timer may be determined by the effective duration of the first timer and a preset time step, for example. The time step may refer to a preset time interval. For example, the effective duration of the first timer may be summed with a preset time step to obtain the effective duration of the second timer. The second preset time period may be set to a time period greater than the first preset time period.

As can be seen from the above description, after the terminal device sends the RRC connection reestablishment request, the RRC reconfiguration procedure may be entered again. After the terminal device sends the RRC reestablishment complete message again, it needs to wait for receiving the RRC reconfiguration message. And in the waiting process, whether the RRC reconfiguration message is received within a second preset time period can be detected again. The second preset time length is longer than the first preset time length, so that the waiting time of the RRC reconnection message is increased, more sufficient waiting time can be provided for the second RRC reconnection, the possibility of receiving the RRC reconnection message is further improved, the success probability of the RRC reconnection is increased, and a more effective RRC reconnection scheme is provided for recovering terminal communication.

As can be seen from the above description, in the two RRC reconfiguration procedures, the network device, that is, the first network device and the second network device, may be co-sited or different from each other. And in case the second establishment of the RRC reconnection fails, a third RRC reconnection may be initiated.

Therefore, in step 901 described above, the terminal device may send an RRC reestablishment complete message to the second network device. The retransmitted RRC reestablishment complete message is used to instruct the second network device to retransmit the RRC reconfiguration message.

And under the condition that the RRC reconfiguration message is not received by the second network equipment within the second preset time period, the terminal equipment can resend the RRC connection reestablishment request to the third network equipment. The retransmitted RRC connection reestablishment request is used to instruct the third network device to transmit an RRC connection reestablishment response message to the terminal device.

It should be appreciated that the third network device may be co-sited with the second network device or may be off-sited. For the content of co-station or alien station, reference is made to the above description, and no further description is given here.

Optionally, under the condition that the second network device does not receive the RRC reconfiguration message for a second preset duration, it may be determined that the target signal strength of the reestablished cell corresponding to the second network device is smaller than the measured signal strength, where the second network device is a network device to which the reestablished cell belongs, the target signal strength of the reestablished cell corresponding to the second network device and the measured signal strength of the neighbor cell are used to determine a target cell for reconnection, and the third network device is a network device corresponding to the target cell for reconnection.

Under the condition that the second RRC reestablishment fails, the RRC reestablishment flow can be initiated to the third network equipment again, so that the terminal equipment executes the RRC reestablishment flow for a plurality of times, and the terminal equipment can finally recover normal communication.

For example, the RRC reestablishment procedure may be initiated for the first network device for the first time, the RRC reestablishment procedure may be initiated for the second network device for the second time, and the reestablishment procedure may be initiated for the third network device for the third time.

It should be noted that, the first network device, the second network device, and the third network device are only network devices corresponding to RRC reestablishment procedure initiated each time from naming. The first network device, the second network device, and the third network device may be the same network device or may be different network devices, which is not limited in this application.

In order to facilitate understanding of the specific flow of three-time RRC re-establishment initiation, fig. 10 shows a signaling interaction diagram of a communication method provided in an embodiment of the present application. As shown in fig. 10, the method may include:

in step 1001, the terminal device sends a radio resource control RRC connection reestablishment complete message to the first network device, where the RRC connection reestablishment complete message instructs the first network device to send an RRC reconfiguration message to the terminal device.

It should be noted that, in this embodiment, the steps or contents may refer to the above description, and for brevity of description, they are not described herein again.

Step 1002, if the terminal device does not receive the RRC reconfiguration message within the first preset duration, the terminal device sends an RRC connection reestablishment request to the second network device, where the RRC connection reestablishment request instructs the second network device to send an RRC connection reestablishment response message to the terminal device.

It should be appreciated that after the terminal device sends the RRC connection reestablishment request, an RRC reestablishment procedure between the terminal device and the second network device is initiated.

Step 1003, the terminal device resends the RRC reestablishment complete message to the second network device, where the resent RRC reestablishment complete message indicates the second network device to resend the RRC reconfiguration message.

Step 1004, if the terminal device does not receive the RRC reconfiguration message sent by the network device again within the second preset time period, resending an RRC connection reestablishment request to the third network device, where the second preset time period is longer than the first preset time period.

The RRC connection reestablishment request is used to instruct the third network device to send an RRC connection reestablishment response message to the terminal device.

It should be understood that, in the process that the terminal device and the third network device execute the RRC reestablishment procedure again, the third preset duration may be set. And recovering radio bearer resources with the terminal equipment under the condition that the RRC reconfiguration message is received within the third preset time period. And if the RRC reconfiguration message is not received within the third preset time period, the RRC connection reestablishment request can be sent again.

It should be appreciated that in the above embodiment, the second preset time period is longer than the first preset time period. The third preset time period may be set to be greater than the second preset time period. Of course, the third preset time period may also be set equal to the second preset time period. The setting mode of the third preset time length is more flexible. The phenomenon of communication interruption for a long time due to overlong waiting time for receiving the RRC reconfiguration message can be avoided.

As can be seen from the above description, in the case where neither the first network device nor the second network device successfully performs RRC reestablishment, the RRC reestablishment procedure may be initiated for the third time. The probability of successful RRC reestablishment of the network equipment can be improved by initiating the RRC reestablishment process for multiple times, and the purpose of quickly recovering user communication is achieved.

It should be appreciated that the RRC reestablishment number threshold may be set. If the number of times of initiating the RRC reestablishment procedure is equal to or greater than the number of times threshold, the terminal device may terminate initiating the RRC reestablishment procedure. By setting the frequency threshold, the terminal equipment can be prevented from continuously executing the RRC reestablishment flow.

The communication method provided in the embodiment of the present application is described in detail above with reference to fig. 3 to 10, and the apparatus provided in the embodiment of the present application is described in detail below with reference to fig. 11.

Fig. 11 is a schematic block diagram of a communication device 1100 provided by an embodiment of the present application. As shown in fig. 11, the communication apparatus 1100 may include a processing unit 1101 and a transceiving unit 1102.

In one possible design, the communication apparatus 1100 may implement the operations of the corresponding terminal device in the above method embodiments, for example, the communication apparatus may be a terminal device, or a component configured in a terminal device, such as a chip or a circuit.

The communication device may implement the corresponding operation of the terminal device in the method embodiments shown in fig. 4 to 10. For example, the transceiver unit 1102 may perform part of the steps 301 and 302 in the method, and the processing unit 1101 may perform part of the step 302 in the method. And each of the units in the communication device 1100 and the other operations and/or functions described above are respectively intended to implement a corresponding flow in the method embodiment shown in fig. 3.

Specifically, when the communication apparatus 1100 is used to perform the communication method shown in fig. 3, the transceiver unit 1102 may be configured to: transmitting a Radio Resource Control (RRC) connection reestablishment completion message, wherein the RRC connection reestablishment completion message instructs the network equipment to transmit an RRC reconfiguration message to the terminal equipment; and under the condition that the RRC reconfiguration message is not received within the first preset time period, sending an RRC connection reestablishment request, wherein the RRC connection reestablishment request indicates the network equipment to send an RRC connection reestablishment response message to the terminal equipment. The processing unit 1101 may be configured to: and judging that the RRC reconfiguration message is not received within the first preset time period.

In one possible design, the processing unit 1101 may also be configured to: starting a first timer; the first preset duration is the effective duration of the first timer.

On the basis of starting the first timer, the transceiver unit 1102 is further configured to: and sending an RRC connection reestablishment request under the condition that the first timer is overtime and the RRC reconfiguration message is not received.

In order to distinguish network devices corresponding to two RRC reconnection flows, on the basis of any of the above embodiments, the RRC connection reestablishment complete message instructs the first network device to send an RRC reconfiguration message to the terminal device; and the RRC connection reestablishment request instructs the second network device to send an RRC connection reestablishment response message to the terminal device.

In order to reduce the re-connection failure of the network device to participate in the RRC re-establishment procedure again, the signal strength of the re-establishment cell measurement may be reduced. At this time, the processing unit 1101 is also configured to: under the condition that the RRC reconfiguration message is not received within the first preset time period, determining that the target signal intensity of the reestablished cell is smaller than the measured signal intensity, wherein the first network equipment is the network equipment to which the reestablished cell belongs, the target signal intensity of the reestablished cell and the measured signal intensity of the neighbor cell are used for determining the reconnected target cell, and the second network equipment is the network equipment corresponding to the target cell.

In order to reduce the signal strength of the re-established cell measurements, the processing unit 1101 may perform at least one of the following:

less than the signal strength measured by the neighbor cells.

The above mainly describes the operations performed by the transceiving unit 1102 and the processing unit 1101 when the RRC reconfiguration message is not received within the first preset time period. For the case that the RRC reconfiguration message is received within the first preset time period, the processing unit 1101 is further configured to: and recovering the radio bearer resources with the network equipment under the condition that the RRC reconfiguration message is received in the first preset time period.

In order to increase the probability of successful re-establishment, multiple RRC re-establishment procedures may be performed, and therefore the processing unit 1101 is further configured to: re-sending an RRC reestablishment completion message, wherein the re-sent RRC reestablishment completion message indicates the network equipment to re-send an RRC reconfiguration message; and under the condition that the network equipment does not receive the RRC reconfiguration message sent again within the second preset time period, the RRC connection reestablishment request is sent again, and the second preset time period is longer than the first preset time period.

Waiting for receiving the RRC reconfiguration message again within the longer second preset duration may increase the reception probability thereof, thereby increasing the probability that the user resumes normal communication.

Thus, the retransmitted RRC reestablishment complete message is used to instruct the second network device to retransmit the RRC reconfiguration message; the retransmitted RRC connection reestablishment request is used to instruct the third network device to transmit an RRC connection reestablishment response message to the terminal device.

It should be noted that, the interaction between the network device and the terminal device in the foregoing embodiment may refer to the interaction between the network device covering the cell and the terminal device, and thus, the network device may be replaced with the cell without distinction. For example, the network device may be replaced with a reestablished cell, and the target cell may be replaced with the network device without distinction. Of course, the device names described above are merely exemplary, and in practical applications, names of network elements, CUs, base stations, etc. may be used instead, which is not limited in this application.

It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

It should be further understood that the division of the modules in the embodiments of the present application is merely illustrative, and there may be another division manner in actual implementation, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, or may exist separately and physically, or two or more modules may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules.

It should be appreciated that the communications apparatus 1100 may correspond to the terminal device 230 or the network devices 210-220 in the communications system shown in fig. 2. Wherein the processing unit 1101 in the communication apparatus 1100 may correspond to a processor in the terminal device 230 or the network devices 210-220, and the instructions stored in the memory may be called by the processor in the terminal device 230 or the network devices 210-220 to implement the above functions, such as network coding, obtaining an original packet, etc.; the transceiver unit 1102 may correspond to an interface in the terminal device 130 or the network devices 110-120, and may implement the above-described functions of receiving and/or transmitting data in response to instructions from the processor.

It should also be understood that the transceiving unit 1102 in the communication apparatus 1100 may be implemented by a transceiver or a communication interface, for example, may correspond to the transceiver 2020 in the terminal device 2000 shown in fig. 12 and the transceiver 3100 in the network device 3000 shown in fig. 13. The processing unit 1101 in the communication apparatus 1100 may be implemented by at least one processor, and may correspond to the processor 2010 in the terminal device 2000 shown in fig. 12 and the processor 3202 in the network device 3000 shown in fig. 13, for example.

Fig. 12 is a schematic structural diagram of a terminal device 2000 provided in an embodiment of the present application. The terminal device 2000 may be applied to a system as shown in fig. 1, and perform the functions of the terminal device in the above-described method embodiment. As shown in fig. 12, the terminal device 2000 includes a processor 2010 and a transceiver 2020. Optionally, the terminal device 2000 further comprises a memory 2030. Wherein the processor 2010, the transceiver 2020 and the memory 2030 may communicate with each other via an internal connection path, transferring control and/or data signals, the memory 2030 is used for storing a computer program, and the processor 2010 is used for calling and running the computer program from the memory 2030 to control the transceiver 2020 to transceive signals. Optionally, the terminal device 2000 may further include an antenna 2040 for transmitting uplink data and uplink control signaling output by the transceiver 2020 through a wireless signal.

The processor 2010 and the memory 2030 may be combined into a single processing device, and the processor 2010 is configured to execute program codes stored in the memory 2030 to implement the functions described above. In particular implementations, the memory 2030 may also be integrated within the processor 2010 or separate from the processor 2010. The processor 2010 may correspond to the processing unit 1101 in fig. 11.

The transceiver 2020 may correspond to the transceiver unit 1102 in fig. 11. The transceiver 2020 may include a receiver (or receiver, receiving circuitry) and a transmitter (or transmitter, transmitting circuitry). Wherein the receiver is for receiving signals and the transmitter is for transmitting signals.

It should be understood that the terminal device 2000 shown in fig. 12 is capable of implementing the respective processes related to the terminal device in the method embodiments shown in fig. 4 to 10. The operations and/or functions of the respective modules in the terminal device 2000 are respectively for implementing the corresponding flows in the above-described method embodiment. Reference is specifically made to the description in the above method embodiments, and detailed descriptions are omitted here as appropriate to avoid repetition.

The above-described processor 2010 may be used to perform the actions described in the previous method embodiments as being performed internally by the terminal device, while the transceiver 2020 may be used to perform the actions described in the previous method embodiments as being transmitted to or received from the network device by the terminal device. Please refer to the description of the foregoing method embodiments, and details are not repeated herein.

Optionally, the terminal device 2000 may also include a power supply 2050 for providing power to various devices or circuits in the terminal device.

In addition, in order to make the functions of the terminal device more complete, the terminal device 2000 may further include one or more of an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, a sensor 2100, and the like, and the audio circuit may further include a speaker 2082, a microphone 2084, and the like.

Fig. 13 is a schematic structural diagram of a network device provided in the embodiment of the present application, for example, may be a schematic structural diagram of a base station/CU. The base station 3000 may be applied to the system shown in fig. 1, and perform the functions of the network device in the above method embodiment. As shown in fig. 13, the base station 3000 may include one or more radio frequency units, such as a remote radio frequency unit (remote radio unit, RRU) 3100 and one or more baseband units (BBU) (also referred to as Distributed Units (DUs)) 3200.RRU 3100 may be referred to as a transceiver unit, corresponding to transceiver unit 1102 in fig. 11. Alternatively, the transceiver unit 3100 may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 3101 and a radio frequency unit 3102. Alternatively, the transceiving unit 3100 may include a receiving unit, which may correspond to a receiver (or receiver, receiving circuit), and a transmitting unit, which may correspond to a transmitter (or transmitter, transmitting circuit). The RRU 3100 is mainly configured to receive and transmit a radio frequency signal and convert the radio frequency signal to a baseband signal, for example, to send indication information to a terminal device. The BBU 3200 portion is mainly used for baseband processing, control of a base station, and the like. The RRU 3100 and BBU 3200 may be physically located together or may be physically separate, i.e. distributed base stations.

BBU 3200 is a control center of a base station, and may also be referred to as a processing unit, and may correspond to processing unit 1101 in fig. 11, and is mainly configured to perform baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and so on. For example, the BBU (processing unit) may be configured to control the base station to perform the operation procedure with respect to the network device in the above-described method embodiment, for example, to generate the above-described indication information, etc.

In one example, BBU 3200 may be formed from one or more single boards, where the multiple single boards may support a single access system radio access network (e.g., an LTE network), or may support different access systems radio access networks (e.g., an LTE network, a 5G network, or other networks). BBU 3200 further comprises memory 3201 and processor 3202. Memory 3201 is used to store the necessary instructions and data. The processor 3202 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation procedures related to the network device in the above-described method embodiment. Memory 3201 and processor 3202 may serve one or more boards. That is, the memory and the processor may be separately provided on each board. It is also possible that multiple boards share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be understood that the base station 3000 shown in fig. 13 is capable of implementing various processes involving network devices in the method embodiments shown in fig. 3 to 10. The operations and/or functions of the respective modules in the base station 3000 are respectively for implementing the corresponding flows in the above-described method embodiments. Reference is specifically made to the description in the above method embodiments, and detailed descriptions are omitted here as appropriate to avoid repetition.

The BBU 3200 described above may be used to perform actions described in the foregoing method embodiments as being implemented internally by a network device, while the RRU 3100 may be used to perform actions described in the foregoing method embodiments as being transmitted to or received from a terminal device by the network device. Please refer to the description of the foregoing method embodiments, and details are not repeated herein.

It should be understood that the base station 3000 shown in fig. 13 is only one possible architecture of a network device, and should not constitute any limitation to the present application. The method provided by the application can be applied to network devices of other architectures. For example, network devices containing CUs, DUs and active antenna units (active antenna unit, AAU), etc. The specific architecture of the network device is not limited in this application.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform the method of any of the method embodiments described above.

It should be understood that the processing means described above may be one or more chips. For example, the processing device may be a field programmable gate array (field programmable gate array, FPGA), an application specific integrated chip (application specific integrated circuit, ASIC), a system on chip (SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), a microcontroller (micro controller unit, MCU), a programmable controller (programmable logic device, PLD) or other integrated chip.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method. To avoid repetition, a detailed description is not provided herein.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip or a chip system, which has signal processing capability. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

According to the method provided by the embodiment of the application, the application further provides a computer program product, which comprises: computer program code which, when run on a computer, causes the computer to perform the method of any of the embodiments shown in fig. 2 to 10.

According to the method provided in the embodiments of the present application, there is further provided a computer readable medium storing a program code, which when run on a computer, causes the computer to perform the method of any one of the embodiments shown in fig. 2 to 10.

According to the method provided by the embodiment of the application, the application further provides a system, which comprises the one or more terminal devices and the one or more network devices.

The network device in the above-mentioned respective apparatus embodiments corresponds entirely to the network device or the terminal device in the terminal device and method embodiments, the respective steps are performed by respective modules or units, for example, the steps of receiving or transmitting in the method embodiments are performed by the communication unit (transceiver), and other steps than transmitting and receiving may be performed by the processing unit (processor). Reference may be made to corresponding method embodiments for the function of a specific unit. Wherein the processor may be one or more.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components may reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between 2 or more computers. Furthermore, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with one another in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks (illustrative logical block) and steps (steps) described in connection with the embodiments disclosed herein can 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 solution. 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 will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

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

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

In the above-described embodiments, the functions of the respective functional units may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (program) are loaded and executed on a computer, the processes or functions in accordance with the embodiments of the present application are fully or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices, such as servers, data centers, etc., that contain an integration of one or more available media. Usable media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., high-density digital video discs (digital video disc, DVDs)), or semiconductor media (e.g., solid State Disks (SSDs)), or the like.

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 may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

transmitting a Radio Resource Control (RRC) connection reestablishment completion message, wherein the RRC connection reestablishment completion message indicates a network device to transmit an RRC reconfiguration message to a terminal device;

and under the condition that the RRC reconfiguration message is not received within a first preset time period, sending an RRC connection reestablishment request, wherein the RRC connection reestablishment request indicates the network equipment to send an RRC connection reestablishment response message to the terminal equipment.

2. The method of claim 1, wherein after sending the radio resource control, RRC, connection reestablishment complete message, further comprising:

3. The method of claim 2, wherein the sending the RRC connection reestablishment request if the RRC reconfiguration message is not received within a first preset duration comprises:

and sending the RRC connection reestablishment request under the condition that the first timer is overtime and the RRC reconfiguration message is not received.

4. A method according to any one of claims 1-3, further comprising:

The RRC connection reestablishment completion message indicates the first network equipment to send an RRC reconfiguration message to the terminal equipment;

the RRC connection reestablishment request indicates the second network equipment to send an RRC connection reestablishment response message to the terminal equipment.

5. The method according to claim 4, wherein the method further comprises:

and under the condition that the RRC reconfiguration message is not received within the first preset duration, determining that the target signal strength of a reestablished cell is smaller than the measured signal strength, wherein the first network equipment is the network equipment to which the reestablished cell belongs, the target signal strength of the reestablished cell and the measured signal strength of the neighbor cell are used for determining a reconnected target cell, and the second network equipment is the network equipment corresponding to the target cell.

6. The method of claim 5, wherein reconstructing the target signal strength of the cell comprises any one of:

adding the signal intensity of the penalty value on the basis of the signal intensity measured by the reconstruction cell;

Less than the signal strength measured by the neighbor cell.

7. A method according to any one of claims 1-3, wherein the method further comprises:

8. A method according to any of claims 1-3, wherein after said sending the RRC connection reestablishment request, the method further comprises:

re-sending an RRC reestablishment completion message, wherein the re-sent RRC reestablishment completion message indicates the network equipment to send an RRC reconfiguration message again;

and under the condition that the network equipment does not receive the RRC reconfiguration message sent again within a second preset time period, resending the RRC connection reestablishment request, wherein the second preset time period is longer than the first preset time period.

9. The method of claim 8, wherein the retransmitted RRC reestablishment complete message is used to instruct the second network device to retransmit an RRC reconfiguration message;

the retransmitted RRC connection reestablishment request is used for indicating a third network device to send an RRC connection reestablishment response message to the terminal device.

10. A terminal device, comprising: a processor and a memory;

the memory stores computer-executable instructions;

the processor executing computer-executable instructions stored in the memory to cause the terminal device to perform the method of any one of claims 1-9.

11. A computer readable storage medium storing a computer program, which when executed by a processor implements the method according to any one of claims 1-9.

12. A system on a chip comprising at least one processor and a communication interface, the communication interface and the at least one processor being interconnected by a wire, the at least one processor being configured to execute a computer program or instructions to perform the method of any of claims 1-9.

13. A computer program product comprising a computer program which, when run, causes a computer to perform the method of any of claims 1-9.