CN115211220A - Method and device for reestablishing wireless link - Google Patents

Abstract

The application discloses a method and a device for reestablishing a wireless link. The method comprises the following steps: the terminal equipment sends a Radio Resource Control (RRC) connection reestablishment request message to the base station; receiving an RRC connection reestablishment message from the base station, wherein the RRC connection reestablishment message is used for responding to the RRC connection reestablishment request message; receiving an RRC connection reconfiguration message from the base station, wherein the RRC connection reconfiguration message carries resource indication information of a scheduling request; sending a scheduling request to the base station according to the resource indication information, and receiving a scheduling indication message, wherein the scheduling indication message is used for authorizing uplink resources; sending a Radio Link Control (RLC) response message, an RRC connection reestablishment completion message and an RRC connection reconfiguration completion message to a base station by adopting the authorized uplink resources; the RLC response message is used to confirm the reception of the RRC connection reestablishment message, the RRC connection reestablishment completion message is used to confirm the completion of the RRC connection reestablishment, and the RRC connection reconfiguration completion message is used to confirm the completion of the RRC connection reconfiguration.

Description

Method and device for reestablishing wireless link Technical Field

The embodiment of the application relates to the technical field of wireless communication, in particular to a method and a device for reestablishing a wireless link.

Background

Nowadays, the network environment of mobile wireless communication still has the disadvantages of complexity, variability, poor interference resistance and the like. In the prior art, the reconstruction of the wireless link takes long time, which is not beneficial to the quick reply of the service.

Taking the 5th generation (5 g) mobile communication technology network as an example, the terminal needs to initiate 3 random access applications to the base station for obtaining uplink resources, so as to sequentially send a Radio Resource Control (RRC) connection reestablishment request, an RRC connection completion message, and a Radio Link Control (RLC) response message to the base station. And then, the terminal receives the RRC connection reconfiguration message sent by the base station, acquires the uplink resource through the scheduling request configuration carried by the RRC connection reconfiguration message, and sends an RRC connection reconfiguration completion message to the base station. At this point, the reestablishment of the radio link is completed.

The contention-based random access is suitable for the request situation of uplink resources with low density. In the prior art, a terminal needs to continuously initiate multiple random access applications for reestablishing a wireless link, which results in long time consumption for reestablishing the wireless link, which damages communication experience of a user, and meanwhile, loads on a network side and power consumption of the terminal are increased.

With the diversification of wireless communication services and application environments, the network environment may become more challenging and, therefore, it is necessary to research how to reduce the recovery delay of the wireless link and improve the communication experience of the user.

Disclosure of Invention

The embodiment of the application provides a method and a device for reestablishing a wireless link, which are used for accelerating the speed of recovering the wireless link, so that the service quality and the communication experience of a user are ensured.

In a first aspect, an embodiment of the present application provides a method for reestablishing a wireless link, where the method is performed by a terminal or a chip for the terminal, and the method includes: sending a Radio Resource Control (RRC) connection reestablishment request message to a base station, wherein the RRC connection reestablishment request message is used for requesting to reestablish RRC connection; receiving an RRC connection reestablishment message from the base station, wherein the RRC connection reestablishment message is used for responding to the RRC connection reestablishment request message; receiving an RRC connection reconfiguration message from the base station, wherein the RRC connection reconfiguration message carries resource indication information of a scheduling request; sending a scheduling request to a base station according to the resource indication information, and receiving a scheduling indication message from the base station, wherein the scheduling indication message is used for authorizing uplink resources; sending a Radio Link Control (RLC) response message, an RRC connection reestablishment completion message and an RRC connection reconfiguration completion message to the base station by adopting the authorized uplink resources; the RLC response message is used to confirm the reception of the RRC connection reestablishment message, the RRC connection reestablishment completion message is used to confirm the completion of the RRC connection reestablishment, and the RRC connection reconfiguration completion message is used to confirm the completion of the RRC connection reconfiguration.

Based on the scheme, the terminal efficiently utilizes the resource indication information of the scheduling request carried by the RRC connection reconfiguration message, and obtains the uplink resource authorization by sending the scheduling request to the base station. Therefore, the terminal may transmit an RLC acknowledgement message, an RRC connection reestablishment complete message, and an RRC connection reconfiguration complete message on the uplink resource. Compared with the prior art, the scheme is favorable for the quick reconstruction of the wireless link, the load of the network side is reduced, and the service experience of the user is promoted.

In the prior art, the RLC response message and the RRC connection reestablishment complete message are uplink transmitted in a random access manner, which is time-consuming and inefficient, so reducing the number of times of random access is a very effective method. The embodiments of the present application provide the following different methods for reducing the number of random accesses, including but not limited to:

as a first possible implementation method, after receiving the RRC connection reestablishment message, suspending sending a random access preamble to the base station; wherein the RRC connection reconfiguration message has been received during suspension of transmission of a random access preamble to the base station.

For example, the time length for suspending the random access preamble transmission to the base station may be configured to be adjustable, or the time length for suspending the random access preamble transmission may include any one of the following: one transmission time interval TTI, two TTIs, or three TTIs, or other TTIs. The duration may be referred to as a waiting time T, so that the resource information indicated by the scheduling request in the RRC connection reconfiguration message may be timely validated by reasonably setting the waiting time T, thereby obtaining the uplink resource for sending the RLC response message, the RRC connection reestablishment complete message, and the RRC connection reconfiguration complete message.

As a second possible implementation method, after receiving the RRC connection reestablishment message, sending a random access preamble to the base station; wherein, the first and the second end of the pipe are connected with each other, before receiving the response message of the random access preamble, the RRC connection reconfiguration message has been received.

Based on the above scheme, after receiving the RRC connection reconfiguration message, terminating a subsequent flow of the random access preamble early. Therefore, the resource information indicated by the scheduling request in the RRC connection reconfiguration message can be timely validated by interrupting the random access process, and the RLC response message, the RRC connection reestablishment completion message and the RRC connection reconfiguration completion message are efficiently sent.

In a second aspect, an embodiment of the present application provides a wireless communication apparatus, including a processing unit and a transceiver unit, where the processing unit is configured to control the transceiver unit to implement the method of the first aspect or any possible implementation method thereof.

In a third aspect, an embodiment of the present application provides a wireless communication apparatus, which may be a terminal, and may also be a chip for a terminal. The apparatus having functionality to implement the method of the first aspect described above or any possible implementation thereof. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a fourth aspect, an embodiment of the present application provides a wireless communication apparatus, including a processor and a memory; the memory is used for storing computer executable instructions, and when the communication device is running, the processor executes the computer executable instructions stored by the memory to implement the method of the first aspect or any possible implementation method thereof.

In a fifth aspect, embodiments of the present application provide a wireless communication device, including a processing circuit and an interface circuit, the interface circuit being configured to couple with a memory external to the wireless communication device and provide a communication interface for the processing circuit to access the memory; the processing circuitry is configured to execute the program instructions in the memory to implement the method of the first aspect described above or any possible implementation thereof.

In a sixth aspect, an embodiment of the present application provides a wireless communication apparatus, which is used to execute units or means of the steps of the method of the first aspect or any possible implementation method thereof.

In a seventh aspect, this application further provides a computer-readable storage medium, which stores instructions for implementing the method of the first aspect or any possible implementation method thereof when the instructions are executed on a computer.

In an eighth aspect, this embodiment of the present application further provides a computer program product containing instructions, which when run on a computer, implements the method of the first aspect or any possible implementation method thereof.

It should be understood that, in the solutions provided in the embodiments of the present application, the wireless communication apparatus may be a wireless communication device, or may be a part of a device in the wireless communication device, such as an integrated circuit product, such as a system chip or a communication chip. The wireless communication device may be a computer device that supports wireless communication functionality.

In particular, the wireless communication device may be a terminal such as a smartphone. A system-on-chip may also be referred to as a system-on-chip (SoC), or simply as an SoC chip. The communication chip can include a baseband processing chip and a radio frequency processing chip. Baseband processing chips are sometimes also referred to as tones modem (modem) or baseband chip. The rf processing chip is also sometimes referred to as a radio frequency transceiver (transceiver) or rf chip. In a physical implementation, part of or all of the communication chips may be integrated inside the SoC chip. For example, the baseband processing chip is integrated in the SoC chip, and the radio frequency processing chip is not integrated with the SoC chip.

Drawings

Fig. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present application;

fig. 2 is a schematic diagram of a control plane radio protocol architecture according to an embodiment of the present application;

fig. 3 is a schematic operational diagram of protocol entities of data link layers under a control plane protocol according to an embodiment of the present application;

fig. 4 is a schematic diagram illustrating mapping between different channels of a wireless communication system according to an embodiment of the present application;

fig. 5 is a schematic diagram of a contention-based random access procedure according to an embodiment of the present application;

fig. 6 is a schematic diagram of an RRC state transition procedure according to an embodiment of the present application;

fig. 7 is a communication flow diagram illustrating a radio link reestablishment method in the prior art;

fig. 8 is a communication flow diagram of a method for reestablishing a wireless link according to an embodiment of the present application;

fig. 9 is a communication flow diagram of another radio link reestablishment method according to an embodiment of the present application;

fig. 10 is a communication flow diagram illustrating a further radio link reestablishment method according to an embodiment of the present application;

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

fig. 12 is a schematic structural diagram of a wireless communication device according to an embodiment of the present disclosure.

It should be understood that the dimensions and forms of the various blocks in the block diagrams described above are for reference only and should not be construed as exclusive of the embodiments of the present application. The relative positions and the inclusion relations among the blocks shown in the structural schematic diagram are only used for schematically representing the structural associations among the blocks, and do not limit the physical connection manner of the embodiment of the application.

Detailed Description

The technical solution provided by the present application is further described below by referring to the drawings and the embodiments. It should be understood that the system structure and the service scenario provided in the embodiment of the present application are mainly used to explain some possible implementations of the technical solutions of the present application, and should not be interpreted as a unique limitation to the technical solutions of the present application. As can be appreciated by those skilled in the art, as the system evolves and newer service scenarios arise, the technical solution provided in the present application may still be applicable to the same or similar technical problems.

It should be understood that the technical solutions provided in the embodiments of the present application include a method for reestablishing a wireless link and a related apparatus thereof. The principles of solving the problems of these solutions are the same or similar, and some of the repeated parts may not be repeated in the following description of the specific embodiments, but it should be understood that these specific embodiments are referred to and can be combined with each other.

In a wireless communication system, devices can be divided into devices that provide wireless network services and devices that use wireless network services. The devices providing wireless network services refer to devices forming a wireless communication network, and may be referred to as network devices (network elements) for short. Network devices are typically assigned to and operated by carriers (e.g., china mobile and Vodafone) or infrastructure providers (e.g., tower companies). The network devices may be further classified into Radio Access Network (RAN) devices and Core Network (CN) devices. A typical RAN equipment includes a Base Station (BS).

It should be understood that a base station may also sometimes be referred to as a wireless Access Point (AP), or a Transmission Reception Point (TRP). Specifically, the base station may be a general Node B (gNB) in a 5G New Radio (NR) system, an evolved Node B (eNB) in a 4G Long Term Evolution (LTE) system.

Devices using wireless network services are often located at the edge of the network, and may be referred to simply as terminals (terminals). The terminal can establish connection with the network equipment and provide specific wireless communication services for users based on the services of the network equipment. It should be understood that the terminal is also sometimes referred to as a User Equipment (UE), or Subscriber Unit (SU), because of the tighter relationship between the terminal and the user. In addition, the terminal tends to move with the user, sometimes referred to as a Mobile Station (MS), relative to a base station, which is typically located at a fixed location. Some network devices, such as Relay Nodes (RNs) or wireless routers, may also be considered as terminals due to their UE identities or due to their affiliations with users.

In particular, the terminal may be a mobile phone (mobile phone), a tablet computer (tablet computer), a laptop computer (laptop computer), a wearable device (such as a smart watch, a smart bracelet, a smart helmet, smart glasses), and other devices with wireless access capability, for example, the smart car, various internet of things (IOT) devices, including various smart home devices (such as smart meters and smart home appliances), and smart city devices (such as security or monitoring devices, smart road traffic facilities), etc.

For convenience of description, the technical solutions of the embodiments of the present application will be described in detail by taking a base station and a terminal as examples.

FIG. 1 is a schematic view of an embodiment of the present application A schematic diagram of a wireless communication system is provided. As shown in fig. 1, the wireless communication system includes a terminal and a base station. Depending on the transmission direction, the transmission link from the terminal to the base station is denoted as Uplink (UL), and the transmission link from the base station to the terminal is denoted as Downlink (DL). Similarly, data transmission in the uplink may be referred to as uplink data transmission or uplink transmission, and data transmission in the downlink may be referred to as downlink data transmission or downlink transmission.

In the wireless communication system, a base station may provide communication coverage for a particular geographic area through an integrated or external antenna device. One or more terminals located within the communication coverage area of the base station may each access the base station. One base station may manage one or more cells (cells). Each cell has an identity (identification), also called cell identity (cell ID). From the perspective of radio resources, one cell is a combination of downlink radio resources and (optionally) uplink radio resources paired therewith.

It should be understood that the wireless communication system may be compliant with 3GPP wireless communication standards, but may also be compliant with other wireless communication standards, such as 802.11, 802.15, or 802.20, which are the 802 series of the Institute of Electrical and Electronics Engineers (IEEE). Although only one base station and one terminal are shown in fig. 1, the wireless communication system may include other numbers of terminals and base stations. In addition, the wireless communication system may include other network devices, such as core network devices.

The terminal and the base station should know the predefined configuration of the wireless communication system, including Radio Access Technologies (RATs) supported by the system, and the radio resources specified by the system, such as radio frequency bands and carriers. A carrier is a range of frequencies that conforms to system specifications. The frequency range may be defined by the center frequency of the carrier wave (denoted as carrier frequency) and the bandwidth of the carrier. These system-predefined configurations may be determined as part of a standard protocol for the wireless communication system or by interaction between the terminal and the base station. The contents of the standard protocols of the wireless communication system, which may be pre-stored in the memories of the terminal and base station, and/or as hardware circuitry or software code of the terminal and the base station.

In the wireless communication system, a terminal and a base station support one or more same RATs, such as 5G nr,4g LTE, or RATs of future evolution systems. Specifically, the terminal and the base station use the same air interface parameters, coding scheme, modulation scheme, and the like, and communicate with each other based on radio resources specified by the system. The air interface parameter is a parameter used for describing air interface characteristics. In the english language, the number of letters, the air interface parameter is sometimes also referred to as numerology. The air interface parameter may include a subcarrier Spacing (SC) and may also include a Cyclic Prefix (CP). The wireless communication system may support a variety of different air interface parameters, these air interface parameters may be part of a standard protocol.

Transmissions between the terminal and the base station may conform to wireless protocols defined by the relevant standards organizations. Fig. 2 is a schematic diagram of a control plane radio protocol architecture according to an embodiment of the present application. The radio protocol architecture may correspond to that of 3 GPP. The NR radio protocol stack is divided into two planes: a user plane and a control plane. A User Plane (UP) protocol stack is a protocol cluster used for User data transmission, and a Control Plane (CP) protocol stack is a protocol cluster used for Control signaling transmission of a system. The user plane protocol is mainly responsible for functions related to user data transmission, and the control plane protocol is mainly responsible for functions such as connection establishment, mobility management and security management.

As shown in fig. 2, the wireless protocol architecture corresponds to a control plane protocol, and a protocol stack is formed from a bottom layer protocol to a top layer protocol, and is divided into three layers, namely, a first layer (layer 1), a second layer (layer 2), and a third layer (layer 3). The terminal and the base station are internally provided with entities of each layer of protocol in the wireless protocol architecture respectively, and the entities of each layer of protocol exchange (including receiving from and sending to) Service Data Units (SDUs) with a higher layer and exchange Protocol Data Units (PDUs) with a lower layer.

Layer 1 is also called a physical Layer, and includes a Physical (PHY) Layer protocol, and the control plane protocol stack uses this as a bottom Layer protocol. The PHY protocol may be used to perform coding/decoding, modulation/demodulation, multiple antenna mapping, mapping of signals to time-frequency resources, and other typical physical layer functions. The PHY protocol provides transport channel services to higher layer (i.e., layer 2) protocols and is responsible for handling the mapping of transport channels to physical channels.

Layer 2 index data link Layer, including in order: a Media Access Control (MAC) protocol, a Radio Link Control (RLC) protocol, and a Packet Data Convergence Protocol (PDCP).

The MAC protocol may be used to perform logical channel multiplexing, hybrid automatic repeat request (HARQ), scheduling, and scheduling related functions. The MAC protocol provides services of logical channels to higher layer protocols, such as the RLC protocol, and is responsible for the mapping of logical channels to transport channels.

The RLC protocol may be used to perform grouping (segmentation) and retransmission processing of RLC data. The RLC protocol may provide services of the RLC channel to an upper layer protocol, such as the PDCP protocol. In a terminal, each RLC channel (and each radio bearer) may correspond to one RLC entity. One RLC entity can be configured into three modes, which are: transparent Mode (TM), unacknowledged Mode (UM), and Acknowledged Mode (AM). The RLC entity may be classified into a TM RLC entity, an UM RLC entity, and an AM RLC entity according to a configured data transmission mode. In the TM mode, only the transparent transmission function of data is provided, that is, only the transmitted content is sent to the destination address, and no change is made to the data content. In UM mode, the protocol provides all RLC functions except for retransmission and re-segmentation, which is an unreliable transport service. AM mode provides all RLC functions, ensuring reliable transport services through error monitoring and retransmission. For AM mode data, the RLC layer of the receiving end needs to send an Acknowledgement (ACK) or Negative Acknowledgement (NACK) message to confirm whether the information is received successfully, and the ACK or NACK message is carried by a status PDU of the RLC layer entity.

The PDCP protocol may be used to perform functions such as Internet Protocol (IP) header compression, ciphering, and integrity protection. In addition, the PDPC protocol can also be used for sequence number (sequence numbering) and in-order delivery (in-order delivery) functions of PDCP data. The PDCP protocol may provide a Radio Bearer (RB) service to an upper layer protocol (i.e., layer 3). In the terminal, each RB may correspond to one PDCP entity. The RB is further divided into a Signaling Radio Bearer (SRB) for carrying signaling data of a control plane and a Data Radio Bearer (DRB) for carrying user plane data.

Layer 3, the network Layer, includes in the control plane protocol: radio Resource Control (RRC) protocol and non-access stratum (NAS) protocol.

NAS protocols may be used to perform functions such as authentication (authentication), mobility management (mobility management), security control (security control), etc.

The RRC protocol may be used to perform functions such as system message broadcasting, paging message sending, RRC connection management, cell selection and reselection, measurement configuration and reporting, and the like, and this function is implemented by transmission of control plane signaling. It is encapsulated at the data link layer as a control plane message containing the corresponding control plane signaling. The control signaling messages of the RRC layer are transmitted using SRBs, and various SRBs are defined in the NR together, mainly SRB0, SRB1, SRB2, and SRB3.SRB0 is a radio bearer established by default without integrity protection and ciphering. The SRB1 is configured to send an RRC message, is configured to indicate a state and a change of an RRC connection, such as an air interface node configuration and a link handover, and is configured to send an NAS message before the SRB2 is established. SRB2 is configured after AS security is activated, for transmitting an RRC message containing the logged measurement information, and NAS messages, which can offload the signaling load of SRB1. SRB3 is used to carry specific RRC signaling.

Fig. 3 is a schematic diagram illustrating operations of protocol entities in each layer of a data link layer under a control plane protocol according to an embodiment of the present disclosure. When the RRC layer transfers the control signaling downwards, the control signaling is a PDCP SDU relative to the PDCP layer. The PDCP SDU is ciphered, etc., by the PDCP entity of the corresponding RB, delivered down to the associated RLC entity as a PDCP PDU. The PDCP PDU is an RLC SDU with respect to the RLC layer, and the RLC entity performs operations such as segmentation, and finally outputs one or more RLC PDUs. The one or more RLC PDUs are one or more MAC SDUs with respect to the MAC layer. These MAC SDUs are multiplexed into one or more MAC PDUs, waiting for a transmission opportunity to the base station, according to the transmission limit indicated by the uplink resource. When each layer processes each SDU, it adds information head to indicate each layer relative parameter information.

Fig. 4 is a schematic diagram illustrating mapping between different channels of a wireless communication system according to an embodiment of the present disclosure. As shown in fig. 4, channels of the wireless communication system may include logical channels, transport channels, and physical channels. The logical channel is a channel between the RLC layer and the MAC layer, the transport channel is a channel between the MAC layer and the PHY layer, and Wu Lixin is a channel through which the PHY layer actually transmits information. Logical channels are mapped to corresponding transport channels, which in turn are mapped to corresponding physical channels.

Logical channels are defined by the type of information carried by the channel and are typically divided into control channels and data channels. The control channel carries control and configuration information required by the wireless communication system, corresponds to a control plane protocol stack, and the data channel corresponds to a data plane protocol stack and carries user data. Specifically, the logical channels may include a Broadcast Control Channel (BCCH), a Paging Control Channel (PCCH), a Common Control Channel (CCCH), a Dedicated Control Channel (DCCH), and a dedicated data channel (DTCH). Wherein, SRB0 uses CCCH for transmission, and SRB1, SRB2 and SRB3 use DCCH.

The transport channels define the manner and characteristics of data transmission over the air interface. Data in a transport channel may be multiplexed into one Transport Block (TB) and transmitted within one Transmission Time Interval (TTI). The transport channels may include a Broadcast Channel (BCH), a Paging Channel (PCH), a downlink shared channel (DL-SCH), and an uplink shared channel (UL-SCH). In addition, a Random Access Channel (RACH) is also defined as a transport channel, although it does not carry transport blocks. Among them, the SRB is mostly transmitted through a Shared Channel (SCH).

The physical channel corresponds to a set of time-frequency resources for carrying the control channel, which may refer to the time-frequency resource grid shown in fig. 4. The physical channel may include a Physical Downlink Shared Channel (PDSCH), a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), a Physical Uplink Shared Channel (PUSCH), and a Physical Uplink Control Channel (PUCCH). The PDCCH and the PUCCH do not have corresponding control channels, and are respectively used for carrying Downlink Control Information (DCI) and Uplink Control Information (UCI). The DCI or UCI provides configuration information required for downlink data transmission and uplink data transmission.

In the case of UCI, there are several predefined formats of UCI, and these predefined formats may include some given Information Elements (IEs). An information element may be understood as a given field of the UCI, the range of values of which and the meaning of each value may be predefined by the system. Among the information carried by the UCI, one type is denoted as Scheduling Request (SR), and is used to request access to the base station and upload data. A precondition for UCI to carry SR is that the base station has configured the SR configuration PUCCH for the terminal side, which is periodic and dedicated for the terminal. Therefore, the flow of the scheduling request is as follows: a terminal receives SR configuration transmitted by a base station; the terminal sends SR on PUCCH to inform the base station that data is to be uploaded; a terminal receives a scheduling indication message, wherein the scheduling indication message carries out downlink transmission through a PDCCH (physical downlink control channel), and comprises specific authorization information of an uplink resource PUSCH (physical uplink shared channel) of a base station, and is used for indicating the resource position, the transmission format, the multi-antenna configuration, the power control and the like of uplink data transmission; the terminal carries out uplink transmission on the message to be sent; and the terminal receives a hybrid automatic repeat request (HARQ) feedback confirmation message, wherein the HARQ feedback confirmation message is used for confirming the successful sending of the message to be sent. It can be known from the above process that since the SR is configured as the dedicated terminal, the speed of accessing the terminal to the base station is increased, so as to quickly obtain the uplink grant resource, and make the uplink transmission very efficient.

Random access is another process in which a terminal requests access to a base station, receives a response from the base station, and allocates an access channel, and uplink transmission of data is generally performed after the random access is successful. The random access is generally divided into a contention-based random access procedure and a non-contention-based random access procedure, and the biggest difference is that the former access preamble allocation is generated by the terminal, so contention and collision resolution procedures are increased compared with the latter. In the process of re-establishing the wireless link, the random access is a contention-based random access procedure.

Fig. 5 is a schematic diagram of a contention-based random access procedure according to an embodiment of the present disclosure. In the figure, the dashed boxes represent different actions that the terminal can take, and the dashed lines represent steps that may occur but are not necessary for a complete random access procedure, and specifically are as follows:

step 501, a terminal sends a random access preamble, where the random access preamble is used to obtain an uplink resource grant.

Since the random access is based on contention access, the base station may receive random access preambles transmitted by a plurality of terminals at the same time, and it does not respond to all the received random access preambles. Therefore, the terminal starts a backoff window (backoff), and monitors the feedback of the base station (i.e., the random access response corresponding to the random access preamble) in the backoff window, and performs the following operations:

step 502a, the base station has no feedback or the sent random access response is wrong, and the terminal performs a new random access preamble sending attempt to the base station again until the number of attempts expires or a correct random access response is received.

And 502b, the terminal receives a correct random access response from the base station, wherein the random access response carries the configuration requirement information of the uplink resource and the size information of the uplink TB.

Step 503, the terminal transmits a TB in an uplink mode, and the TB is marked as Msg 3; and the TB size accords with the size information of the uplink TB in the random access response.

Due to the instability of the network, the Msg 3 transmission may fail, so the terminal takes the following actions according to the feedback from the base station (i.e. the contention resolution message, which should correspond to the Msg 3):

step 504a, the base station has no feedback or the sent competition resolving message is wrong, and the terminal retransmits the Msg 3 in a configuration mode until the maximum retransmission times; and if the competition resolving message is not received, the random access process is initiated again.

Step 504b, the terminal receives a correct contention resolution message from the base station, where the contention resolution message is used to indicate that the Msg 3 is successfully sent and the random access procedure is ended.

In the embodiment of the present application, the Msg 3 refers to an RRC connection reestablishment request, an RRC connection reestablishment completion message, and an RLC response message; the size of the Msg 3 is specified by the base station, and the content of the Msg 3 is the complete content or partial content of the information to be uploaded by the terminal; if the Msg 3 carries partial content, the terminal initiates a new random access process again after the random access process is finished, until the information to be transmitted is sent.

Therefore, the time delay of the random access has uncertainty, and if the size of the information content needing to be uploaded exceeds the limit in the random access response, the terminal needs to start a second random access process. Therefore, uplink transmission achieved by random access has the characteristics of sometimes being prolonged, uncertain, and inefficient.

Fig. 6 is a schematic diagram of an RRC state transition procedure according to an embodiment of the present application. As shown in fig. 6, the terminal and the base station may enter different NR RRC protocol states, which include: IDLE (RRC _ IDLE), CONNECTED (RRC _ CONNECTED) and INACTIVE (RRC _ INACTIVE) for reasons that may include mobility changes or traffic triggers, etc

Taking UE as an example, when the terminal is in NR RRC _ IDLE state, it monitors the broadcast message of the gNB. When the situation changes, such as registration or service triggering, the terminal establishes a link with the base station, and the link is switched from the NR RRC _ IDLE state to the NR RRC _ CONNECTED state, and the link can be switched back to the NR RRC _ IDLE state after the connection is released. When the terminal is in the NR RRC _ CONNECTED state, because there is no traffic or other scenes temporarily, the connection is suspended and enters the NR RRC _ INACTIVE state, and the connection is resumed and enters the NR RRC _ CONNECTED state after the traffic is triggered. When the terminal is in the NR RRC _ INACTIVE state, the connection is released to the NR RRC _ IDLE state.

As can be seen from the above description, when the terminal starts traffic communication, the RRC _ CONNECTED state is entered. This requires establishing a communication connection for RRC and securing the integrity and confidentiality of the communication by configuring Access Stratum (AS) security. AS security includes integrity protection of RRC SRB and encryption of SRB and DRB carrying data, and the implementation method is security context (security context). The security context is temporary state information established by the network for the terminal, wherein the temporary state information comprises key information and data bearing information, and the purpose is to reduce resource consumption for mutual authentication with the network when the terminal is switched between different states, facilitate the terminal to rapidly enter a connection state, and perform secure communication. If the AS security is not activated, the original RRC connection and the related configuration are deleted, and a new RRC connection is established.

In summary, establishing RRC connection includes establishing SRB1, activating AS security, and establishing SRB2 and DRB.

When the terminal is in the RRC _ CONNECTED state, the RRC connection between the terminal and the base station is not stable. Due to environmental instability, such as: the wireless link fails due to the occurrence of link switching failure, high-probability bit errors of a downlink channel of the link, difficulty in transmitting an uplink channel of the link, inconsistency of parameter configuration and safety information understanding of a terminal and a network side and the like. Specific failure reasons are: 1) Radio link reconfiguration failures, including synchronization failures and configuration errors; 2) Cell handover fails; 3) Other reasons.

At this time, the terminal searches for a cell with a better selection signal to initiate connection recovery, and tries to recover the wireless link again, so that the user data or voice service is not interrupted. The communication process, i.e. the reestablishment of the radio link, recovers the user service by reestablishing the RRC connection, and includes the following steps: restore and update RB configuration and reactivate and update AS security.

As shown in fig. 7, which is a schematic flow chart of a radio link reestablishment method in the prior art, a dashed box represents a random access flow, where the message content of Msg 3 is a message on an arrow in the dashed box. The link reestablishment process comprises the following steps:

step 701, the terminal initiates a random access procedure for uplink transmission of an RRC connection reestablishment Request (Re-initialization Request) message.

The terminal restores the RRC configuration and the security context from the stored security context, and restores the SRB1 at the terminal side. And then sending an RRC connection reestablishment request message to the base station, wherein the RRC connection reestablishment request message is carried by the SRB 0. The RRC connection reestablishment request message carries radio link failure reason information and terminal identity information. The information of the wireless link failure reason is used for the base station side to generate corresponding RRC connection reestablishment information, and the terminal identity information is used for the base station side to carry out security context retrieval.

The base station recovers the RRC configuration and AS security and rebuilds SRB1 resources at the base station side, thereby providing integrity and encryption protection for subsequent uplink and downlink messages. And then, the base station transmits the RRC connection reestablishment message to the terminal in a downlink manner, recovers DRB and SRB2 resources of the base station side, and transmits the RRC connection reconfiguration message in the sequence as described above.

Step 702, a terminal receives an RRC connection reestablishment (Re-establishment) message, wherein information carried by the RRC connection reestablishment message is used for indicating to update an AS security key; wherein the AS security key comprises an encryption and decryption key of the PDCP layer.

Since the RRC connection reestablishment message is AM data of the RLC layer, it is necessary for the data link layer at the terminal side to feed back an RLC acknowledgement message (ACK), otherwise, the base station retransmits the RRC connection reestablishment message.

Step 703, the terminal starts a complete random access procedure for sending an RLC response message, where the RLC response message is used to indicate successful reception of the RRC connection reestablishment message.

Step 704, the terminal starts a Complete random access procedure for one time, and is configured to send an RRC connection reestablishment Complete (Re-establishment Complete) message, where the RRC connection reestablishment Complete message is used to confirm successful completion of RRC connection reestablishment;

the RRC connection reestablishment completion message is transmitted on the SRB1, integrity and encryption protection are carried out on the PDCP layer, the RRC connection reestablishment completion message is mapped to an AM RLC entity on the RLC layer for segmentation processing, and finally the RLC layer is sealed in the TB after multiplexing and is handed over to the physical layer for uplink transmission.

Step 705, the terminal receives an RRC connection Reconfiguration (Reconfiguration) message, where the RRC connection Reconfiguration message carries information used to modify an RRC connection configuration, recover DRB and SRB2 resources at the terminal side, and perform SR configuration;

wherein, the PDCP layer may decrypt the RRC connection reconfiguration message according to the updated decryption key.

Step 706, the terminal sends a scheduling request to the base station according to the uplink resource information indicated by the SR configuration.

Step 707, the terminal receives a scheduling indication message from the base station, where the scheduling indication message is used to authorize an uplink resource.

Step 708, the terminal sends an RRC connection Reconfiguration Complete (Reconfiguration Complete) message on the granted uplink resource, where the RRC connection Reconfiguration Complete message is used to confirm successful completion of RRC connection Reconfiguration.

At this point, the procedure for the terminal to reestablish the RRC radio link is completed. In this process, after receiving the RRC connection reestablishment request message, the base station transmits an RRC connection reestablishment message (step 702) and an RRC connection reconfiguration message (step 705) to the terminal in sequence. The RRC connection reestablishment signaling is sent on SRB1, and the RRC connection reconfiguration signaling may be sent on SRB1 or SRB3. With reference to the configurations and algorithms of different base stations, the RRC connection reestablishment signaling and the RRC connection reconfiguration signaling may be generated in a short time, in the order as described, and delivered to the lower layer. Both of the above signaling needs integrity and ciphering protection depending on the type of RB, and thus ciphering is performed in the PDCP layer, and is encapsulated as an RLC SDU in the RLC layer by an AM RLC entity, and then mapped to the next layer as one or more RLC PDUs(s) after segmentation. After receiving the MAC SDUs, the MAC layer may multiplex the MAC SDUs into the same MAC PDU and wait for transmission by the PHY layer. Therefore, the RRC connection reestablishment message and the RRC connection reconfiguration message may be sent in one TB, or may be sent in adjacent TBs or non-adjacent TBs, where the specific situation is related to the base station configuration. Both of which will be discussed in the subsequent examples.

According to the above-mentioned flows, in the prior art, the terminal initiates 3 random access flows in sequence, which are respectively used for sending RRC Re-assignment Request, RLC ACK and RRC Re-assignment Complete messages. However, according to the introduction of the random access procedure, which belongs to contention access, the time delay for reestablishing the wireless link of the terminal is increased, which is not favorable for fast recovery of data service. Meanwhile, this also increases the network side load and increases the power consumption of the terminal.

To solve the above problems, the general idea of the embodiments of the present application is as follows:

in step 705, the terminal receives an RRC connection reconfiguration message, which carries an SR configuration. The SR configuration is periodic and dedicated to the terminal, and therefore, obtaining the uplink resource grant through the SR is a fast and efficient uplink resource request method without performing contention access. Therefore, unnecessary random access procedures are reduced, and uplink transmission messages (herein, RLC response messages, RRC connection reestablishment completion messages, and RRC connection reconfiguration completion messages) are combined and transmitted through uplink resources acquired by the scheduling indication messages, so that reestablishment of a radio link and recovery of a network can be accelerated. The reducing unnecessary random access procedures include, but are not limited to, not initiating a random access procedure and interrupting an initiated random access procedure.

The embodiments of the present application will be described below with reference to specific examples. As described above, the base station downlink-transmits the RRC connection reestablishment message and the RRC connection reconfiguration message, which may be in one TB or in adjacent or non-adjacent TBs, which are discussed in fig. 8 and 9, respectively.

As shown in fig. 8, for a schematic flowchart of the terminal reestablishing the radio link according to the embodiment of the present application, the base station sends the RRC connection reestablishment message and the RRC connection reconfiguration message to the terminal in a downlink in the same Transport Block (TB). The dashed box represents a random access procedure, wherein the message content of Msg 3 is the message on the arrow in the dashed box. The flow diagram comprises the following steps:

step 801, the terminal starts a complete random access procedure for transmitting an RRC connection reestablishment request message to the base station.

Step 802, a terminal receives a TB sent by a base station, where the TB includes an RRC connection reestablishment message and an RRC connection reconfiguration message, and the RRC connection reconfiguration message carries SR configuration information.

And step 803, the terminal sends a scheduling request to the base station according to the uplink resource information indicated by the SR configuration.

Step 804, the terminal receives a scheduling indication message from the base station, wherein the scheduling indication message is used for authorizing uplink resources.

Step 805, the terminal sends an RLC response message, an RRC connection reestablishment complete message, and an RRC connection reconfiguration complete message on the authorized uplink resource; the RLC response message is used to indicate the successful reception of the RRC connection reestablishment message, the RRC connection reestablishment completion message is used to confirm the successful completion of the RRC connection reestablishment, and the RRC connection reconfiguration completion message is used to confirm the successful completion of the RRC connection reconfiguration.

When the RRC connection reestablishment message and the RRC connection reconfiguration message are in the same TB, the data link layer of the terminal processes the TB and delivers the two messages upwards, in the same order as described above. Since the RRC connection reestablishment message is an AM message, the terminal should send an RLC response message to confirm successful reception of the RRC connection reestablishment message. But the terminal sends the RLC response message after delaying, the implementation mode includes control at a data link layer, and the controlled action includes generating or sending the RLC response message after delaying.

In addition, because the signaling generated by the base station has a sequence, the messages demultiplexed by the terminal should follow the sequence as well: the RRC connection reestablishment message is before and the RRC connection reconfiguration message is after. Therefore, the RRC layer will get RRC connection re-establishment signaling first. After the signaling is processed, the terminal sends an RRC connection reconstruction completion message after delaying, the implementation mode includes but is not limited to that the RRC layer submits a control signaling for completing the RRC connection reconstruction after delaying, and the data link layer sends the RRC connection reconstruction completion message after delaying; the deferred handing-over behavior comprises deferred generation of an RRC connection reestablishment completion signaling.

And the subsequent RRC connection reconfiguration message is decrypted by the PDCP layer and then delivered to the RRC layer for updating the SR configuration of the terminal, so that the terminal can efficiently apply for uplink resource authorization to the base station. Meanwhile, the RRC layer generates and delivers an RRC connection reestablishment complete signaling and an RRC connection reconfiguration complete signaling to the lower layer, respectively, in the order as described. The RLC layer also generates an RLC acknowledgement message, which is waiting for transmission along with the two aforementioned signaling. The MAC layer specifies the total size of the RLC PDU to the RLC layer based on the granted new uplink resource. The RLC layer segments two to-be-sent signaling according to the total size of the RLC PDU, that is, one signaling may correspond to a plurality of RLC PDUs. These RLC PDUs are separately added with a header and multiplexed into one or more TBs to be uploaded to the base station. In the case of multi-TB transmission, the terminal does not need to acquire a new uplink resource grant during the period.

It can be known from the above process that the terminal controls the generation of the RLC response message and the RRC reestablishment complete message to enable the RLC response message and the RRC reestablishment complete message to use an uplink resource grant together with the transmission of the RRC reconfiguration complete message, so that the total number of times of applying for the uplink grant to the base station is reduced, and particularly, the number of times of obtaining grants through random access procedures when the terminal transmits the RLC response message and the RRC reestablishment complete message is subtracted, thereby reducing the time consumption and efficiently recovering the radio link connection. Compared with the prior art, the three messages needing to be uploaded are sent through the same uplink resource authorization, wherein the uplink resource authorization is further acquired through the SR configuration carried by the existing RRC reconfiguration message. Therefore, the embodiment of the application simplifies the reconstruction process of the wireless link, greatly saves the time consumption of link reconstruction, and reduces the occupation of uplink resources and the network side of the base station.

The embodiment shown in fig. 9 is a case where the RRC connection reestablishment message and the RRC connection reconfiguration message are transmitted in different TBs. For the foregoing reasons, the base station may downlink the RRC connection reestablishment message and the RRC connection reconfiguration message in different TBs. Herein, the TB including the RRC connection reestablishment message is referred to as a first TB, and the TB including the RRC connection reconfiguration message is referred to as a second TB. Due to the instability of the environment of wireless transmission and the retransmission initiated by the base station, the sequence of the TBs received by the terminal may be wrong, i.e. the second TB may arrive at the terminal before the first TB. It should be understood that the steps in the flow chart represent only one of the cases. The dashed box represents a random access procedure, wherein the message content of Msg 3 is the message on the arrow in the dashed box. The method comprises the following specific steps:

step 901, the terminal starts a complete random access procedure for sending an RRC connection reestablishment request message.

Step 902, the terminal receives an RRC connection reestablishment message.

Step 903, the terminal receives an RRC connection reconfiguration message, where the RRC connection reconfiguration message carries SR configuration information.

And 904, the terminal sends a scheduling request to the base station according to the uplink resource information indicated by the SR configuration.

Step 905, the terminal receives a scheduling indication message from the base station, where the scheduling indication message is used to grant uplink resources.

Step 906, the terminal sends an RLC response message, an RRC connection reestablishment complete message, and an RRC connection reconfiguration complete message on the granted uplink resource.

When the second TB is received by the terminal earlier than the first TB, the data link layer demultiplexes to obtain the RLC SDU containing the RRC connection reconfiguration signaling, but because the upward submission characteristic of the PDCP layer is the on-demand submission, the signaling can be distinguished to arrive before the RRC connection reconfiguration signaling. The PDCP layer buffers the RRC connection reconfiguration signaling and waits for the RRC connection reestablishment signaling. In addition, since the RRC connection reestablishment signaling carries indication information of AS key update, the decryption key of the PDCP layer is not updated, and the RRC connection reconfiguration signaling cannot be decrypted and handed over. Therefore, on the terminal side, the control signaling sequence submitted by the data link layer to the network layer is defined as RRC connection reestablishment signaling first and then RRC connection reconfiguration signaling.

As in the foregoing embodiment, after the terminal receives the RRC connection reestablishment message, the terminal delays sending the RLC ACK and the RRC connection reestablishment complete message, so that the random access procedure is not started to apply for the uplink resource authorization. As in the foregoing embodiment, the terminal waits for the uplink resource grant carried by the RRC reconfiguration message, and is used for integrated transmission of the following messages: an RLC acknowledgement message, an RRC connection reestablishment complete message, and an RRC connection reconfiguration complete message. For the terminal side, after the first TB, the arrival time of the second TB is unknown, and considering the instability of the wireless network, such as network congestion or data loss, the waiting time T can be set to avoid the waste of network resources caused by the base station repeatedly downloading the RRC connection reestablishment message due to the failure of receiving the RLC ACK. The waiting time T is used to indicate a time for the terminal to delay initiating the random access procedure, that is, a time for suspending sending the random access preamble to the base station, and T may be a fixed parameter or an adjustable parameter.

If T is a fixed parameter, it is pre-stored at the terminal side, and a specific value can be set according to factors such as user service, and when the RRC connection reestablishment procedure starts, the RRC layer notifies the data link layer downward to indicate that the layer generates or transmits an RLC response message by delaying the maximum T time after receiving the RRC reestablishment message, and the delayed data link layer initiates a random access procedure to the base station. Meanwhile, the RRC layer also submits RRC connection reestablishment completion signaling to the data link layer at the maximum delay time T.

If T is an adjustable parameter, the calculation method is based on various factors, including but not limited to terminal requirements, service requirements, priority, etc.

If the terminal does not receive the RRC reconfiguration message within the time T, a random access process is initiated to the base station for applying for uplink resource authorization and sending an RLC response message and an RRC connection reestablishment completion message.

Therefore, by reasonably setting the waiting time T, the terminal can delay the sending of the RLC response message and the RRC connection reestablishment completion message, wait for the SR configuration in the RRC connection reconfiguration message, perform uplink scheduling application and acquire uplink authorization resources according to the SR configuration, and thus the purpose of reducing the initiation times of the random access process is achieved. The uplink resources obtained through the application efficiently combine and send the RLC response message, the RRC reestablishment completion message and the RRC reconfiguration completion message, so that the reestablishment time delay of a radio link is reduced.

Fig. 10 is a schematic flowchart of another procedure for reestablishing a wireless link according to an embodiment of the present application, where a dashed box represents a random access procedure, where the message content of Msg 3 is a message on an arrow in the dashed box. The process comprises the following steps:

step 1001, the terminal starts a one-time complete random access procedure for sending an RRC connection reestablishment request message.

Step 1002, the terminal receives an RRC connection reestablishment message.

Step 1003, the terminal sends a random access preamble.

Step 1004, the terminal receives an RRC connection reconfiguration message, wherein the RRC connection reconfiguration message carries SR configuration information.

Step 1005, the terminal sends a scheduling request to the base station according to the uplink resource information indicated by the SR configuration.

Step 1006, the terminal receives a scheduling indication message from the base station, where the scheduling indication message is used for granting uplink resources.

Step 1007, the terminal sends an RLC response message, an RRC connection reestablishment complete message, and an RRC connection reconfiguration complete message on the granted uplink resource.

As can be seen from the above process, after step 1002, the terminal intends to apply for uplink resource authorization to the base station through a complete random access process for sending an RLC response message. In step 1003, the terminal sends a random access preamble, which is the first step of starting a complete random access procedure, and the base station receives a random access response, which carries an uplink resource grant to indicate information for the terminal to configure uplink resources. Since this response behavior is only a response of the base station side to the received random access preamble, it is not informed of the corresponding upload content. Therefore, the base station may send the RRC connection reconfiguration message to the terminal before sending the random access response.

In this case, that is, the terminal receives the RRC connection reconfiguration message first and then receives the random access response, and the RRC layer updates the SR configuration carried by the RRC connection reconfiguration message to the lower layer. Accordingly, the terminal interrupts the random access procedure and transmits a scheduling request to the base station using the SR configuration. Meanwhile, the RRC layer transmits an RRC connection reestablishment complete signaling downwards first, and then transmits an RRC connection reconfiguration complete signaling. The data link layer finally sends the following messages by using the uplink resource authorized in the scheduling indication message: an RLC acknowledgement message, an RRC connection reestablishment complete message, and an RRC connection reconfiguration complete message.

If the random access response reaches the terminal earlier than the RRC connection reconfiguration message, the terminal uses the uplink resource applied by the random access to send an RLC response message, and starts the random access process again, the authorized uplink resource is used for sending an RRC connection reestablishment completion message, and finally the uplink authorization in the scheduling indication message is used for sending the RRC connection reconfiguration completion message.

In addition, since the time for the terminal to receive the RRC connection reconfiguration message is unknown, that is, while receiving the message, the terminal may already send the random access preamble, or may start the random access procedure but not send the random access preamble, it should be understood that step 1003 is not a necessary step, and is only one of the possible situations. After receiving the RRC connection reconfiguration message, the terminal immediately interrupts the random access procedure, including but not limited to stopping generation of the random access preamble, stopping transmission of the random access preamble, discarding the random access response, and the like, where the act of interrupting the random access occurs in the data link layer and the physical layer. And then, the terminal takes effect of the uplink resource authorization in the scheduling indication message and sends an RLC response message, an RRC connection reestablishment completion message and an RRC connection reconfiguration completion message.

According to the above flow, the terminal does not guarantee the integrity of the random access flow, so that the random access flow can be interrupted, and the three messages can be efficiently transmitted in an integrated manner. Since the single TB uplink resource grant is obtained through random access, and the size of the content that can be carried by the grant is determined by the base station, the grant is not as efficient as the grant of the uplink resource obtained by the scheduling request, which allows multiple TBs to be uploaded, and therefore the latter is more suitable for the coordinated transmission of the aforementioned three messages in the RRC reestablishment procedure. The terminal responds to the RRC connection reconfiguration message in time, breaks the random access flow in progress and takes effect of SR configuration in the RRC connection reconfiguration message, so that the three messages are transmitted more efficiently, and the time delay of wireless link reconstruction is reduced.

A wireless communication apparatus according to an embodiment of the present application is described below.

Referring to fig. 11, a schematic block diagram of a wireless communication device provided in an embodiment of the present application is shown, where the communication device 1100 includes a processing unit 1110 and a transceiver unit 1120. The wireless communication device is used for realizing the steps of the corresponding terminal in the embodiments:

the processing unit 1110 is configured to control the transceiver 1120. A transceiver 1120, configured to send an RRC connection reestablishment request message, where the RRC connection reestablishment request message is used to request to reestablish an RRC connection; receiving an RRC connection reestablishment message of the base station, wherein the RRC connection reestablishment message is used for responding to the RRC connection reestablishment request message; receiving an RRC connection reconfiguration message from the base station, wherein the RRC connection reconfiguration message carries resource indication information of a scheduling request; receiving scheduling indication information from the base station, wherein the scheduling indication information is used for authorizing uplink resources; and sending an RLC response message, an RRC connection reestablishment completion message and an RRC connection reconfiguration completion message. The RLC response message is used to confirm the reception of the RRC connection reestablishment message, the RRC connection reestablishment completion message is used to confirm the completion of the RRC connection reestablishment, and the RRC connection reconfiguration completion message is used to confirm the completion of the RRC connection reconfiguration.

In a possible implementation method, the processing unit 1110 is further configured to suspend the transceiver 1120 from transmitting a random access preamble after receiving the RRC connection reestablishment message. Wherein the RRC connection reconfiguration message has been received during suspension of transmission of a random access preamble to the base station.

In a possible implementation method, the processing unit 1110 is configured to configure a duration for the transceiver 1120 to suspend sending the random access preamble.

In a possible implementation method, the time duration for suspending sending the random access preamble configured by the processing unit 1110 includes any one of: one transmission time interval TTI, two TTIs, or three TTIs.

In a possible implementation method, the transceiver 1120 is further configured to transmit a random access preamble after receiving the RRC connection reestablishment message. Wherein the RRC connection reconfiguration message has been received before receiving the response message of the random access preamble.

In a possible implementation method, the processing unit 1110 is further configured to terminate the subsequent procedure of the random access preamble in advance after the transceiver unit 1120 receives the RRC connection reconfiguration message.

In each of the above embodiments, the transceiver 1120 may be divided into one receiver and one transmitter, and each of the receivers may have a function of receiving and transmitting, and is not limited herein.

Optionally, the communication device may further include a storage unit, which is used for storing data or instructions (also referred to as codes or programs), and the units may interact with or be coupled with the storage unit to implement corresponding methods or functions. The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules.

In the embodiment of the present application, the division of the units in the communication device is only a division of logical functions, and may be wholly or partially integrated into one physical entity or may be physically separated in actual implementation. And the units in the communication device can be realized in the form of software called by the processing element; or may be implemented entirely in hardware; part of the units can also be realized in the form of software called by a processing element, and part of the units can be realized in the form of hardware. For example, each unit may be a processing element separately set up, or may be implemented by being integrated in a chip of the communication apparatus, or may be stored in a memory in the form of a program, and a function of the unit may be called and executed by a processing element of the communication apparatus. In addition, all or part of the units can be integrated together or can be independently realized. The processing element described herein, which may also be referred to as a processor, may be an integrated circuit having signal processing capabilities. In the implementation process, the steps of the method or the units above may be implemented by integrated logic circuits of hardware in a processor element or in a form called by software through the processor element.

In one example, the units in any of the above communication devices may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), or a combination of at least two of these integrated circuit forms. As another example, when a unit in a communication device may be implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor that may invoke a program. As another example, these units may be integrated together and implemented in the form of a system-on-a-chip (SOC).

Referring to fig. 12, a schematic structural diagram of a wireless communication apparatus provided in this embodiment of the present application is shown, where the wireless communication apparatus may be a wireless communication apparatus or a network device, or may be a chip or a circuit, such as a chip or a circuit that can be disposed in the wireless communication apparatus, or further such as a chip or a circuit that can be disposed in the network device, for implementing the method in the foregoing method embodiment. As shown in fig. 12, the communication apparatus 1200 includes: the processor 1210 and the transceiver 1230, and optionally the communication device 1200 further includes a memory 1220, the memory 1220 not necessarily being shown by a dashed box. The transceiver 1230 is used to enable communication with other devices.

Further, the communication apparatus 1200 may further include a bus system, wherein the processor 1210, the memory 1220 and the transceiver 1230 may be connected via the bus system.

It is to be understood that the processor 1210 may be a chip. For example, the processor 1302 may be a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit (DSP), a Microcontroller (MCU), a Programmable Logic Device (PLD), or other integrated chips.

In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 1210. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor, or in a combination of the hardware and software modules of the processor 1210. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1220, and the processor 1210 reads the information in the memory 1220, and performs the steps of the above method in combination with the hardware thereof.

In particular, the functions/implementation procedures of the transceiver unit 1120 in fig. 11 may be implemented by the processor 1210 in the communication apparatus 1200 shown in fig. 12 calling the computer executable instructions stored in the memory 1220. Alternatively, the function/implementation process of the transceiving unit 1120 in fig. 11 may be implemented by the transceiver 1230 in the communication apparatus 1200 shown in fig. 12.

It should be noted that the processor 1210 in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor described above 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, discrete hardware components. The various methods, steps, and logic blocks disclosed 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 the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

In embodiments of the present application, the memory 1220 may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, synchronous Link DRAM (SLDRAM), and direct rambus 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.

In the case where the communication apparatus 1200 corresponds to the wireless communication apparatus in the above method, the communication apparatus may include a processor 1210, a transceiver 1230, and a memory 1220. The memory 1220 is configured to store instructions, and the processor 1210 is configured to execute the instructions stored by the memory 1220, so as to implement the steps performed by the wireless communication apparatus in any one or more corresponding methods shown in fig. 8 to 9. .

Those of ordinary skill in the art will understand that: the first and second numbers mentioned in the embodiments of the present application are only for convenience of description and are not used to limit the scope of the embodiments of the present application, and also to indicate the sequence. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one" means one or more. At least two means two or more. "at least one," "any," or similar expressions refer to any combination of these items, including any combination of singular or plural items. 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 multiple. "plurality" means two or more, and other terms are analogous.

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

The technical solutions provided in the embodiments of the present application may be wholly or partially implemented 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. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a terminal device, a network device, an artificial intelligence device, or other programmable apparatus. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.

In embodiments of the present application, various embodiments may be referred to one another, for example, methods and/or terms between method embodiments may be referred to one another, for example, functions and/or terms between apparatus embodiments and method embodiments may be referred to one another.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (16)

1. A method for radio link re-establishment, comprising:

   sending a Radio Resource Control (RRC) connection reestablishment request message to a base station, wherein the RRC connection reestablishment request message is used for requesting to reestablish RRC connection;

   receiving an RRC connection reestablishment message from the base station, wherein the RRC connection reestablishment message is used for responding to the RRC connection reestablishment request message;

   receiving an RRC connection reconfiguration message from the base station, wherein the RRC connection reconfiguration message carries resource indication information of a scheduling request;

   sending a scheduling request to the base station according to the resource indication information, and receiving a scheduling indication message from the base station, wherein the scheduling indication message is used for authorizing uplink resources;

   sending a Radio Link Control (RLC) response message, an RRC connection reestablishment completion message and an RRC connection reconfiguration completion message to the base station by adopting the authorized uplink resources;

   the RLC response message is used to confirm the reception of the RRC connection reestablishment message, the RRC connection reestablishment completion message is used to confirm the completion of the RRC connection reestablishment, and the RRC connection reconfiguration completion message is used to confirm the completion of the RRC connection reconfiguration.
2. The method of claim 1, further comprising:

   suspending transmission of a random access preamble to the base station after receiving the RRC connection reestablishment message;

   wherein the RRC connection reconfiguration message has been received during suspension of transmission of a random access preamble to the base station.
3. The method of claim 2, wherein:

   the time length for suspending the sending of the random access preamble to the base station is configurable time length.
4. The method of claim 3, wherein:

   the time length for suspending the sending of the random access preamble to the base station includes any one of:

   one transmission time interval TTI, two TTIs, or three TTIs.
5. The method of claim 1, further comprising:

   transmitting a random access preamble to the base station after receiving the RRC connection reestablishment message;

   wherein the RRC connection reconfiguration message has been received before receiving the response message of the random access preamble.
6. The method of claim 5, further comprising:

   terminating the subsequent flow of the random access preamble in advance after receiving the RRC connection reconfiguration message.
7. A wireless communications apparatus, comprising:

   a processing unit and a transceiver unit;

   wherein, the processing unit is used for controlling the transceiving unit, and the transceiving unit is used for:

   sending a Radio Resource Control (RRC) connection reestablishment request message to a base station, wherein the RRC connection reestablishment request message is used for requesting to reestablish RRC connection;

   receiving an RRC connection reestablishment message from the base station, wherein the RRC connection reestablishment message is used for responding to the RRC connection reestablishment request message;

   receiving an RRC connection reconfiguration message from the base station, wherein the RRC connection reconfiguration message carries resource indication information of a scheduling request;

   sending a scheduling request to the base station according to the resource indication information, and receiving a scheduling indication message from the base station, wherein the scheduling indication message is used for authorizing uplink resources;

   sending a Radio Link Control (RLC) response message, an RRC connection reestablishment completion message and an RRC connection reconfiguration completion message to the base station by adopting the authorized uplink resources;

   the RLC response message is used to confirm the reception of the RRC connection reestablishment message, the RRC connection reestablishment completion message is used to confirm the completion of the RRC connection reestablishment, and the RRC connection reconfiguration completion message is used to confirm the completion of the RRC connection reconfiguration.
8. The apparatus of claim 7, wherein:

   the transceiver unit is further configured to: suspending transmission of a random access preamble to the base station after receiving the RRC connection reestablishment message;

   wherein the RRC connection reconfiguration message has been received during suspension of transmission of a random access preamble to the base station.
9. The apparatus of claim 8, wherein:

   the time length for suspending the sending of the random access preamble to the base station is configurable time length.
10. The apparatus of claim 9, wherein:

    the time length for suspending the sending of the random access preamble to the base station includes any one of:

    one transmission time interval TTI, two TTIs, or three TTIs.
11. The apparatus of claim 7, wherein:

    the transceiver unit is further configured to: transmitting a random access preamble to the base station after receiving the RRC connection reestablishment message;

    wherein the RRC connection reconfiguration message has been received before the response message of the random access preamble is received.
12. The apparatus of claim 11, wherein:

    the processing unit is further to: terminating the subsequent flow of the random access preamble in advance after receiving the RRC connection reconfiguration message.
13. A wireless communications apparatus, comprising:

    a processor and a memory, wherein the memory is configured to store program instructions and the processor is configured to execute the program instructions in the memory to implement the method of any of claims 1 to 6.
14. A wireless communications apparatus, comprising:

    processing circuitry and interface circuitry; wherein, the first and the second end of the pipe are connected with each other,

    the interface circuit is configured to couple to a memory external to the wireless communication device and to provide a communication interface for the processing circuit to access the memory;

    the processing circuitry is configured to execute program instructions in the memory to implement the method of any of claims 1 to 6.
15. A computer-readable storage medium characterized by:

    the computer-readable storage medium has stored therein program code which, when executed by a processor, implements the method of any of claims 1 to 6.
16. A computer program product, characterized in that:

    the computer program product comprising program code which, when executed by a processor, implements the method of any one of claims 1 to 6.

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