Random access method, system, base station and readable storage medium

Abstract

The application provides a random access method, system and related device. The method comprises: receiving a random access request sent by a mobile terminal in a first cell; allocating a user identifier according to the random access request; and sending a first message containing the user identifier and a signaling request to a corresponding second cell, the first message being used to assist the second cell to determine the user identifier and to establish a signaling bearer with the mobile terminal; wherein the first cell is a cell processing data plane functions, a first base station is a base station where the first cell is located, the second cell is a cell processing signaling plane functions, and a second base station is a base station where the second cell is located. The application uses random access resources of the first cell to perform a random access process and to establish a signaling bearer between the second cell and the mobile terminal, so as to reduce network cost and energy consumption.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communication technology, and in particular to a random access method, system, base station and readable storage medium. Background Technology

[0002] The existing 5G architecture introduces centralized units (CU), distributed units (DU), and integrated base stations. In current network deployments, due to increasingly higher frequencies, the coverage area of ​​cells is decreasing. With the increase in traffic, ultra-dense networking and multi-band three-dimensional networking are now commonly used methods. The direct problems brought about by these are that network costs and network energy consumption are increasing. Summary of the Invention

[0003] This invention provides a random access method, system, base station, and readable storage medium, aiming to establish signaling bearer between a second cell and a mobile terminal using random access from a first cell, thereby reducing network costs and energy consumption.

[0004] To solve the above problems, the present invention is implemented as follows:

[0005] In a first aspect, embodiments of the present invention provide a random access method, executed by a first cell, the method comprising:

[0006] Receive random access requests sent by mobile terminals in the first cell;

[0007] User identifiers are assigned based on the random access request;

[0008] Send a first message to the corresponding second cell. The first message includes a user identifier and a signaling request allocated by the first cell. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal.

[0009] Wherein, the first cell is a cell that processes data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that processes signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0010] Optionally, before the step of receiving a random access request sent by a mobile terminal in the first cell, the method includes:

[0011] The first signal of the first cell is sent to the mobile terminal. The first signal of the first cell is used to assist the mobile terminal in comparing the first signal strength of the first cell with the second signal strength of the second cell to determine whether to perform random access through the first cell.

[0012] Optionally, the step of allocating a user identifier according to the random access request includes:

[0013] The user identifier is assigned according to the first random access message MSG1 sent by the mobile terminal.

[0014] Optionally, before the step of sending first information to the corresponding second cell, wherein the first information includes a user identifier and a signaling request allocated by the first cell, and the first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, the following steps are included:

[0015] Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, notify the mobile terminal of the uplink authorization in the first cell, and assemble the second random access message MSG2;

[0016] The MSG2 is sent to the mobile terminal;

[0017] Receive the third random access message MSG3 sent by the mobile terminal according to MSG2.

[0018] Optionally, the step of sending first information to the corresponding second cell, wherein the first information includes a user identifier and a signaling request allocated by the first cell, and the first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, includes:

[0019] The first base station sends a first network element message to the second base station. The first network element message carries the user identifier and the RRC signaling carried by MSG3. The first network element information is used to assist the second cell in establishing a signaling bearer with the mobile terminal.

[0020] Optionally, the method further includes:

[0021] Send the fourth random access message MSG4 to the mobile terminal.

[0022] Optionally, the first user identifier corresponds one-to-one with the mobile terminal.

[0023] Optionally, the step of allocating a user identifier according to the random access request further includes:

[0024] Receive the MSGA sent by the mobile terminal and assign the user identifier;

[0025] Optionally, the step of sending first information to the corresponding second cell, wherein the first information includes a user identifier and a signaling request allocated by the first cell, and the first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, includes:

[0026] The first base station of the first cell sends a second network element message to the second base station where the second cell is located. The second network element message carries the user identifier and the RRC signaling carried by the MSGA.

[0027] Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, and send at least one of the RRC connection establishment request, RRC re-establishment request and system information type identifier of the terminal request to the second cell;

[0028] The random access response is reassembled, and the random access response, along with an RRC connection establishment or RRC re-establishment message or system information response, is sent to the mobile terminal.

[0029] Secondly, embodiments of the present invention provide a random access method, executed by a second cell, comprising:

[0030] Receive user identifier and signaling request sent by the first cell, wherein the user identifier and signaling request are obtained by the first cell based on the random access request sent by the mobile terminal;

[0031] Establish a signaling bearer with the mobile terminal based on the user identifier and signaling request;

[0032] Wherein, the first cell is a cell that processes data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that processes signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0033] Thirdly, embodiments of the present invention also provide a random access method, executed by a first cell and a second cell, comprising: the first cell receiving a random access request sent by a mobile terminal;

[0034] The first cell allocates a user identifier based on the random access request;

[0035] The first cell sends the user identifier and signaling request to the corresponding second cell;

[0036] The second cell determines the received user identifier and establishes a signaling bearer with the mobile terminal according to the signaling request. The first cell is a cell that processes data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that processes signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0037] Fourthly, embodiments of the present invention also provide a base station, comprising:

[0038] The first receiving module is used to receive random access requests sent by mobile terminals in the first cell;

[0039] The allocation module is used to allocate user identifiers according to the random access request;

[0040] The first sending module sends first information to the corresponding second cell. The first information includes a user identifier and a signaling request allocated by the first cell. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal.

[0041] Wherein, the first cell is a cell that processes data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that processes signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0042] Fifthly, embodiments of the present invention also provide a base station, comprising:

[0043] The second receiving module is used to receive a user identifier and signaling request sent by the first cell, wherein the user identifier and signaling request are obtained by the first cell based on a random access request sent by the mobile terminal;

[0044] The connection module is used to establish a signaling bearer with the mobile terminal based on the user identifier and signaling request;

[0045] Wherein, the first cell is a cell that processes data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that processes signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0046] In a sixth aspect, embodiments of the present invention also provide a random access system, comprising: a first cell, a second cell, and a computer program; the first cell and the second cell are configured to read the computer program to implement the steps in the random access method as described in the third aspect above.

[0047] In a seventh aspect, embodiments of the present invention also provide a readable storage medium for storing a program, which, when executed by a processor, implements the steps of the method described in the first aspect above.

[0048] This embodiment of the invention receives a random access request sent by a mobile terminal in a first cell; allocates a user identifier according to the random access request; and sends first information to the corresponding second cell. The first information includes the user identifier allocated by the first cell and a signaling request. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal. The first cell is a cell that handles data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that handles signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of an RRC connection establishment request, an RRC re-establishment request, and a system information type identifier requested by the mobile terminal. When a mobile terminal randomly accesses the network, it first sends a random access command to the first cell responsible for data plane signaling processing. The first cell allocates a corresponding user identifier based on the random access command sent by the mobile terminal. Then, the first cell sends the allocated user identifier and access command to the second cell responsible for completing the signaling plane protocol stack processing. The second cell then establishes a signaling bearer between the mobile terminal and the user identifier based on the access command. Thus, the mobile terminal can establish a signaling bearer between the first cell and the second cell. This invention uses the low-frequency second cell for signaling coverage and the high-frequency first cell to forward requests according to the mobile terminal's requests, establishing a signaling bearer between the second cell and the mobile terminal. This reduces the deployment of the second cell and signaling base stations, thereby reducing the overall network cost and thus reducing the overall network energy consumption. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the structure of a network system to which embodiments of the present invention can be applied;

[0051] Figure 2This is one of the flowcharts of the random access method provided in the embodiments of the present invention;

[0052] Figure 3 This is one of the signaling flow diagrams of the random access method provided in the embodiments of the present invention;

[0053] Figure 4 This is the second schematic diagram of the signaling flow of the random access method provided in this embodiment of the invention;

[0054] Figure 5 This is a second flowchart illustrating the random access method provided in this embodiment of the invention;

[0055] Figure 6 This is the third flowchart illustrating the random access method provided in this embodiment of the invention;

[0056] Figure 7 This is one of the structural schematic diagrams of the base station provided in the embodiment of the present invention. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] In the embodiments of this invention, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices. Additionally, the use of "and / or" in this invention indicates at least one of the connected objects, such as A and / or B and / or C, representing seven possibilities: including A alone, B alone, C alone, both A and B present, both B and C present, both A and C present, and A, B, and C present.

[0059] Please see Figure 1 , Figure 1 This is a structural diagram of a network system to which embodiments of the present invention can be applied, such as... Figure 1 As shown, it includes a mobile terminal 11, a first cell 12, and a second cell 13.

[0060] Among them, mobile terminal 11, first cell 12 and second cell 13 can communicate with each other.

[0061] In practical applications, the mobile terminal 11 can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), mobile internet device (MID), wearable device, or in-vehicle device, etc. In existing technologies, signaling and data are mostly processed through the same base station. This invention divides the base station into a data base station and a signaling base station according to its function, thus decoupling data and signaling functions. The data base station is responsible for processing data plane signaling, as well as some potential assistance to the signaling plane processing; the signaling base station is responsible for executing signaling plane functions. The first cell is the cell that processes data plane functions, and the first base station is the base station where the first cell is located. The second cell is the cell that processes signaling plane functions, and the second base station is the base station where the second cell is located. One data base station can correspond to multiple first cells 12, and the cell responsible for data transmission is called the first cell. One signaling base station can also correspond to multiple second cells 13.

[0062] The random access method provided in the embodiments of the present invention will be described below.

[0063] See Figure 2 , Figure 2 This is one of the flowcharts of the random access method provided in the embodiments of the present invention. Figure 2 The random access method shown can be executed by the first cell.

[0064] like Figure 2 As shown, the random access method may include the following steps:

[0065] Step 200: Receive a random access request sent by a mobile terminal in the first cell;

[0066] In the prior art, signaling and data are mostly transmitted through the same base station. This invention decouples the signaling and data functions and divides the base station into independent data base stations and signaling base stations according to their functions. The data base station can correspond to multiple first cells, and the signaling base station can correspond to multiple second cells. The signaling base station / second cell completes the processing of the entire signaling plane protocol stack, and the data base station / first cell completes the processing of data plane signaling, as well as some potential assistance in signaling plane processing.

[0067] In existing 5G network deployments, under carrier aggregation (CA) and dual connectivity (DC) scenarios, additional carrier units (CCs) and base stations are added to users to improve data transmission. However, the primary / secondary relationship between different cells is determined according to the current status of each UE, leading to situations where primary and secondary cells can be interchanged. This problem disappears after decoupling the signaling from the primary cell. At the point of access, the user terminal can distinguish between the primary and secondary cells in the current network.

[0068] The random access procedure refers to the process from when a user sends a random access preamble to attempt network access until a basic signaling connection is established with the network. The random access procedure is used in multiple events, especially in handover and RRC connection reconstruction processes. Specifically, when a mobile terminal needs to perform random access, it sends a random access request to its local cell.

[0069] Step 210: Assign a user identifier according to the random access request;

[0070] After receiving a random access request from a mobile terminal, the first cell responds to the random access request. Specifically, the response process includes assigning a corresponding user identifier to the mobile terminal based on the random access request. This user identifier corresponds one-to-one with the mobile terminal, meaning that the user identifier assigned by the first cell is unique. This is to ensure that users do not conflict in the second cell.

[0071] Step 220: Send first information to the corresponding second cell. The first information includes a user identifier and a signaling request allocated by the first cell. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal.

[0072] After the first cell assigns a user identifier to the mobile terminal that sends a random access request, it sends the assigned user identifier and signaling request to the corresponding second cell. After receiving the user identifier and signaling request sent by the first cell, the second cell determines the received user identifier and establishes a signaling bearer with the mobile terminal corresponding to the user identifier according to the signaling request.

[0073] This embodiment of the invention receives a random access request sent by a mobile terminal in a first cell; allocates a user identifier according to the random access request; and sends first information to the corresponding second cell. The first information includes the user identifier allocated by the first cell and a signaling request. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal. The first cell is a cell that handles data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that handles signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of an RRC connection establishment request, an RRC re-establishment request, and a system information type identifier requested by the mobile terminal. When a mobile terminal randomly accesses the network, it first sends a random access command to the first cell responsible for data plane signaling processing. The first cell allocates a corresponding user identifier based on the random access command sent by the mobile terminal. Then, the first cell sends the allocated user identifier and access command to the second cell responsible for completing the signaling plane protocol stack processing. The second cell then establishes a signaling bearer between the mobile terminal and the user identifier based on the access command. Thus, the mobile terminal can establish a signaling bearer between the first cell and the second cell. This invention uses the low-frequency second cell for signaling coverage and the high-frequency first cell to forward requests according to the mobile terminal's requests, establishing a signaling bearer between the second cell and the mobile terminal. This reduces the deployment of the second cell and signaling base stations, thereby reducing the overall network cost and thus reducing the overall network energy consumption.

[0074] Optionally, in some embodiments, based on the above embodiments, before random access, the mobile terminal may first determine whether to perform random access through the first cell. Specifically, before the step of receiving the random access request sent by the mobile terminal in the first cell, the method includes:

[0075] The first signal of the first cell is sent to the mobile terminal. The first signal of the first cell is used to assist the mobile terminal in comparing the first signal strength of the first cell with the second signal strength of the second cell to determine whether to perform random access through the first cell.

[0076] During initial random access and Radio Resource Control (RRC) connection re-establishment, the mobile terminal (UE) first determines whether to initiate random access through the first cell. The criteria for this determination include: the first cell sending a first signal to the UE, and the second cell sending a second signal to the UE. The UE then obtains the signal strengths of the first and second cells based on the first and second signals, respectively, and determines whether to initiate the random access procedure through the first cell using the signal strengths of the first and second cells. For example, the received signal power (RSRP) can be used to determine whether to initiate the random access procedure through the first cell. Specifically, the criteria for this determination can be (RSRP...)第一小区 -RSRP 第二小区 )>Preset threshold value. Where RSRP 第一小区 It is the signal strength of the first cell, RSRP. 第二小区 This refers to the signal strength of the second cell. It can also be calculated according to (RSRP). 第一小区 RSRP 第二小区 And (RSRP) 第二小区 The system uses a preset threshold value to determine whether random access is initiated in the first cell. If the signal quality of the first cell meets the above formula, random access is initiated in the first cell. Alternatively, the determination criterion may include: judging based on cell load; if the number of times a user fails to access the second cell or receives a service interface instruction to back off exceeds a preset threshold, random access is initiated in the first cell.

[0077] Furthermore, random access can be applied to four-step random access. Specifically, the steps described above for allocating user identifiers based on the random access request include:

[0078] Step S211: Receive the first random access message MSG1 sent by the mobile terminal, and assign the user identifier;

[0079] Step 220 also includes:

[0080] Step S212: Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, notify the mobile terminal of the uplink authorization in the first cell, and assemble the second random access message MSG2;

[0081] Step S213: Send the MSG2 to the mobile terminal;

[0082] Step S214: Receive the third random access message MSG3 sent by the mobile terminal according to MSG2;

[0083] Step S215: Send the fourth random access message MSG4 to the mobile terminal.

[0084] Correspondingly, a first message is sent to the corresponding second cell. This first message includes a user identifier allocated by the first cell and a signaling request. The first message assists the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, including the following steps:

[0085] The first base station sends a first network element message to the second base station. The first network element message carries the user identifier and the RRC signaling carried by MSG3. The RRC signaling includes at least one of RRC connection establishment request, RRC re-establishment request and system information type identifier requested by the mobile terminal. The first network element information is used to assist the second cell in establishing a signaling bearer with the mobile terminal.

[0086] Before performing the four-step random access, the mobile terminal UE can first determine whether to perform random access through the first cell. The determination method can be the same as the method described in the previous embodiment.

[0087] like Figure 3 As shown, after determining that random access will be performed through the first cell, the mobile terminal can send the first random access message MSG1 to the first cell. After receiving MSG1, the first cell assigns a temporary user identifier to the user, calculates the time advance TA value between the UE and the first cell and the second cell, notifies the mobile terminal of the uplink authorization on the first cell, and assembles the second random access information (i.e. response information) MSG2 to the UE.

[0088] After receiving the random access response, the UE sends MSG3 to the first cell, which includes the user identifier. Simultaneously, the first cell sends the user identifier CRNTI assigned to the UE to the second cell. If it is the Common Control Channel (CCCH), the Radio Resource Control (RRC) signaling is sent to the second cell through the interface between the signaling base station and the data base station, specifically through the first interface. The first cell also sends the CRNTI assigned to the UE to the second cell. When assigning the CRNTI, the first cell should ensure that it does not conflict with other users in the second cell. After receiving the RRC signaling, the second cell sends RRC signaling through the first interface. The RRC signaling includes at least one of the following: RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal. The RRC connection establishment message includes the UE's signaling bearer establishment in the second cell and the UE's configuration in the second cell. The second cell then performs corresponding signaling based on at least one of the following: RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal. Specifically, it generates an RRC re-establishment message according to the RRC re-establishment request and sends it to the first cell; generates an RRC re-establishment message according to the RRC re-establishment request and sends it to the first cell; determines the context information of the mobile terminal through the second user identifier carried by MSG3; and generates system information according to the system information type identifier.

[0089] The first cell sends a Contention Resolution Message (MSG4) to the UE. The first cell then forwards Radio Resource Control (RRC) signaling to the corresponding UE. The Contention Resolution Message can be sent before or simultaneously with the RRC signaling. Based on the above description, it can be understood that the first cell is essentially an extension of the second cell, thus increasing the number of UEs that can access the network.

[0090] During uplink synchronization failure and handover, the step of sending the user identifier and signaling request to the corresponding second cell, wherein the signaling request is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, includes:

[0091] The user identifier and signaling request are sent to the corresponding second cell. The signaling request is used to assist the second cell in finding the corresponding mobile terminal context information based on the user identifier in order to establish a signaling bearer with the mobile terminal.

[0092] During uplink synchronization failure and handover, the UE carries a user identifier, such as C-RNTI, in the MSG3 reported by the first cell. The first cell then determines the user identifier reported by the UE and sends it to the second cell through the first interface. After receiving the user identifier, the second cell establishes a signaling bearer by finding the corresponding UE context information.

[0093] Furthermore, random access can be applied to two-step random access. Specifically, the step of allocating a user identifier based on the random access request includes:

[0094] Step S216: Receive the MSGA sent by the mobile terminal and assign the user identifier;

[0095] The step of sending the user identifier and signaling request to the corresponding second cell, wherein the signaling request is used to assist the second cell in storing the user identifier and establishing a signaling bearer with the mobile terminal, includes:

[0096] Step S221: Send a second network element message to the second base station where the second cell is located through the first base station of the first cell. The second network element message carries the user identifier and the RRC signaling carried by the MSGA. The RRC signaling includes at least one of the following: RRC connection establishment request, RRC re-establishment request and system information type identifier requested by the mobile terminal.

[0097] Step S222: Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, and send at least one of the RRC connection establishment request, RRC re-establishment request and system information type identifier of the terminal request to the second cell.

[0098] Step S223: Reassemble the random access response and send the random access response and the RRC connection establishment or RRC re-establishment message or system information response to the mobile terminal.

[0099] Before performing two-step random access, the mobile terminal UE can first determine whether to perform random access through the first cell. The determination method can be the same as the method described in the above embodiments, that is, the same method as the four-step competitive random access. Figure 4 As shown, after the mobile terminal determines that it will access the first cell, the mobile terminal initiates a random access request through the first cell, that is, the mobile terminal initiates an MSGA to the first cell.

[0100] After receiving the MSGA, the first cell assigns a temporary user identifier to the user, calculates the time advance (TA) value between the first and second cells, and sends the Radio Resource Control (RRC) context to the second cell through the interface between the first and second cells. After allocating a CRNTI to the UE, the first cell assembles the Random Access Response (RAR) and MSGB for the UE. Upon receiving the RRC context signaling, the UE establishes, re-establishes, or resumes its RRC connection with the second cell. The RRC context signaling includes at least one of the following: an RRC connection establishment request, an RRC re-establishment request, and a system information type identifier requested by the mobile terminal.

[0101] See Figure 5 , Figure 5 This is the second flowchart illustrating the random access method provided in this embodiment of the invention. Figure 5 The random access method shown can be performed by a second cell, and the method includes:

[0102] Step S500: Receive user identifier and signaling request sent by the first cell, wherein the user identifier and signaling request are obtained by the first cell based on the random access request sent by the mobile terminal;

[0103] Step S510: Establish a signaling bearer with the mobile terminal based on the user identifier and signaling request.

[0104] This embodiment describes the random access procedure from the perspective of the second cell. Specifically, when a mobile terminal needs to access the network randomly, it sends a random access request to the first cell where it resides. After receiving the random access request, the first cell responds to it. Specifically, the response process includes assigning a corresponding user identifier to the mobile terminal based on the random access request. This user identifier corresponds one-to-one with the mobile terminal, meaning that the user identifier assigned by the first cell is unique. This is to ensure that users in the second cell do not conflict with each other.

[0105] After the first cell assigns a user identifier to the mobile terminal that sends a random access request, it sends the assigned user identifier and a signaling request to the corresponding second cell. After receiving the user identifier and signaling request from the first cell, the second cell saves the received user identifier and establishes a signaling bearer with the mobile terminal corresponding to the user identifier according to the signaling request. The first cell is a cell that handles data plane functions, and the first base station is the base station where the first cell is located. The second cell is a cell that handles signaling plane functions, and the second base station is the base station where the second cell is located. The signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0106] It should be noted that this embodiment is an implementation of the second cell corresponding to the above method embodiment. Therefore, the various processing steps can be referred to the relevant descriptions in the above method embodiment, and the same beneficial effects can be achieved. To avoid repetition, they will not be repeated here.

[0107] Further, the step of establishing a signaling bearer with the mobile terminal based on the user identifier and signaling request includes:

[0108] The user identifier is used to locate the corresponding mobile terminal context information in order to establish a signaling bearer with the mobile terminal.

[0109] Furthermore, the step of establishing a signaling bearer with the mobile terminal based on the user identifier and signaling request also includes:

[0110] The second base station where the second cell is located sends a third network element message to the first base station where the first cell is located. The third network element message carries at least one of the following: RRC connection establishment, RRC re-establishment message and system information.

[0111] Furthermore, the step of sending a third network element message to the first base station where the first cell is located through the second base station where the second cell is located, wherein the third network element message carries at least one of the following: RRC connection establishment, RRC re-establishment message and system information, includes at least one of the following:

[0112] An RRC re-establishment message is generated according to the RRC connection establishment and sent to the first cell;

[0113] An RRC reset message is generated according to the RRC reset procedure and sent to the first cell;

[0114] The context information of the mobile terminal is determined by the second user identifier carried by MSG3;

[0115] System information is generated according to the system information type identifier.

[0116] See Figure 6, Figure 6 This is the third flowchart illustrating the random access method provided in this embodiment of the invention. Figure 6 The random access method shown can be performed by a first cell and a second cell, and the method includes:

[0117] Step S600: The first cell receives a random access request sent by the mobile terminal.

[0118] Step S610: The first cell allocates a user identifier according to the random access request;

[0119] Step S620: The first cell sends the user identifier and signaling request to the corresponding second cell;

[0120] In step S630, the second cell determines the received user identifier and establishes a signaling bearer with the mobile terminal according to the signaling request. The first cell is a cell that processes data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that processes signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0121] It should be noted that this embodiment is an implementation of the system corresponding to the above method embodiments. Therefore, the various processing flows can be referred to the relevant descriptions in the above method embodiments, and the same beneficial effects can be achieved. To avoid repetition, further details will not be provided here.

[0122] See Figure 7 , Figure 7 This is one of the structural schematic diagrams of a base station provided in an embodiment of the present invention. The base station is a data base station, specifically comprising:

[0123] The first receiving module 700 is used to receive a random access request sent by a mobile terminal in the first cell;

[0124] Allocation module 710 is used to allocate user identifiers according to the random access request;

[0125] The first sending module 720 is used to send first information to the corresponding second cell. The first information includes a user identifier and a signaling request allocated by the first cell. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal.

[0126] Wherein, the first cell is a cell that processes data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that processes signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0127] Optionally, the base station also includes:

[0128] The second transmitting module (not shown) is used to transmit the first signal of the first cell to the mobile terminal. The first signal of the first cell is used to assist the mobile terminal in comparing the first signal strength of the first cell with the first signal strength of the second cell to determine whether to perform random access through the first cell.

[0129] Optionally, the allocation module 710 may include:

[0130] The first receiving unit is configured to receive the first random access message MSG1 sent by the mobile terminal and assign the user identifier;

[0131] Optionally, the base station also includes:

[0132] The calculation module is used to calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, notify the uplink authorization, and assemble the second random access message MSG2;

[0133] The third sending module is used to send the MSG2 to the mobile terminal;

[0134] The second receiving module is used to receive the third message MSG3, which is randomly accessed by the mobile terminal according to the MSG2.

[0135] An allocation unit is used to allocate the user identifier according to the MSG3;

[0136] The first sending module is further configured to send a first network element message to the second base station through the first base station. The first network element message carries the user identifier and the RRC signaling carried by MSG3. The RRC signaling includes at least one of RRC connection establishment request, RRC re-establishment request and system information type identifier requested by the mobile terminal. The first network element information is used to assist the second cell in establishing a signaling bearer with the mobile terminal.

[0137] The third sending module is used to send a fourth message MSG4, which is a random access message, to the mobile terminal.

[0138] Optionally, the user identifier corresponds one-to-one with the mobile terminal.

[0139] Optionally, the first sending module 720 is further configured to send the user identifier and signaling request to the corresponding second cell, wherein the signaling request is used to assist the second cell in finding the corresponding mobile terminal context information based on the user identifier in order to establish a signaling bearer with the mobile terminal.

[0140] Optionally, the allocation module 710 may include:

[0141] The third receiving unit is used to receive the MSGA sent by the mobile terminal and allocate the user identifier;

[0142] The first sending module 720 is further configured to send a second network element message to the second base station where the second cell is located via the first base station of the first cell. The second network element message carries the user identifier and the RRC signaling carried by the MSGA. The RRC signaling includes at least one of the following: RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0143] Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, and send at least one of the RRC connection establishment request, RRC re-establishment request and system information type identifier of the terminal request to the second cell;

[0144] The random access response is reassembled, and the random access response, along with an RRC connection establishment or RRC re-establishment message or system information response, is sent to the mobile terminal.

[0145] It should be noted that the base station provided in this embodiment can implement the embodiments of the present invention. Figure 2 The various processes in the method embodiments, and the achievement of the same beneficial effects, will not be described again here to avoid repetition. Modules or units with similar functions can be the same module or different modules. For example, the first sending module and the second sending module can be the same module or different modules.

[0146] The various optional implementation methods described in the embodiments of the present invention can be combined with each other or implemented individually without conflict, and the embodiments of the present invention do not limit this.

[0147] This invention also provides a base station, which is a signaling base station, comprising:

[0148] The second receiving module is used to receive a user identifier and signaling request sent by the first cell, wherein the user identifier and signaling request are obtained by the first cell based on a random access request sent by the mobile terminal;

[0149] The connection module is used to establish a signaling bearer with the mobile terminal based on the user identifier and signaling request;

[0150] Wherein, the first cell is a cell that processes data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that processes signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal.

[0151] It should be noted that the base station provided in this embodiment can implement the embodiments of the present invention. Figure 3 The various processes in the method embodiments, and the ways to achieve the same beneficial effects, will not be repeated here to avoid repetition.

[0152] This invention also provides a random access system. The random access system may include: a first cell, a second cell, and a computer program, wherein the first cell and the second cell are used to read the computer program to implement, for example... Figure 5 The steps in the random input method and the achievement of the same beneficial effect will not be repeated here.

[0153] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by hardware related to program instructions, and the program can be stored in a readable medium. The present invention also provides a readable storage medium storing a computer program, which, when executed by a processor, can implement the above-described methods. Figures 2 to 5 Any step in the corresponding method embodiment can achieve the same technical effect, and will not be repeated here to avoid repetition.

[0154] The storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0155] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A random access method, executed by a first cell, characterized in that, The method includes: Receive random access requests sent by mobile terminals in the first cell; User identifiers are assigned based on the random access request; Send a first message to the corresponding second cell. The first message includes a user identifier and a signaling request allocated by the first cell. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal. Wherein, the first cell is a cell that handles data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that handles signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal; the first cell is a high-frequency band cell; the second cell is a low-frequency band cell; The step of allocating a user identifier according to the random access request further includes: Receive the MSGA sent by the mobile terminal and assign the user identifier; The step of sending a first message to the corresponding second cell, wherein the first information includes a user identifier and a signaling request allocated by the first cell, and the first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, includes: The first base station of the first cell sends a second network element message to the second base station where the second cell is located. The second network element message carries the user identifier and the RRC signaling carried by the MSGA. Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, and send at least one of the RRC connection establishment request, RRC re-establishment request and system information type identifier of the terminal request to the second cell; The random access response is reassembled, and the random access response, along with an RRC connection establishment or RRC re-establishment message or system information response, is sent to the mobile terminal.

2. The method according to claim 1, characterized in that, Before the step of receiving a random access request sent by a mobile terminal in the first cell, the method includes: The first signal of the first cell is sent to the mobile terminal. The first signal of the first cell is used to assist the mobile terminal in comparing the first signal strength of the first cell with the second signal strength of the second cell to determine whether to perform random access through the first cell.

3. The method according to claim 1, characterized in that, The step of allocating a user identifier according to the random access request includes: The user identifier is assigned according to the first random access message MSG1 sent by the mobile terminal.

4. The method according to claim 1, characterized in that, Before the step of sending a first message to the corresponding second cell, wherein the first message includes a user identifier and a signaling request allocated by the first cell, and the first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, the following steps are included: Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, notify the mobile terminal of the uplink authorization in the first cell, and assemble the second random access message MSG2; Send the MSG2 to the mobile terminal; Receive the third random access message MSG3 sent by the mobile terminal according to MSG2.

5. The method according to claim 4, characterized in that, The step of sending a first message to the corresponding second cell, wherein the first message includes a user identifier allocated by the first cell and a signaling request, and the first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, includes: The first base station sends a first network element message to the second base station. The first network element message carries the user identifier and the RRC signaling carried by MSG3. The first network element information is used to assist the second cell in establishing a signaling bearer with the mobile terminal.

6. The method according to claim 4, characterized in that, The method further includes: Send the fourth random access message MSG4 to the mobile terminal.

7. The method according to claim 1, characterized in that, The user identifier corresponds one-to-one with the mobile terminal.

8. A random access method, executed by a second cell, characterized in that, The method includes: The system receives a first message sent by a first cell, the first message including a user identifier and a signaling request, the user identifier and signaling request being obtained by the first cell based on a random access request sent by the mobile terminal; Establish a signaling bearer with the mobile terminal based on the user identifier and signaling request; Wherein, the first cell is a cell that handles data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that handles signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal; the first cell is a high-frequency band cell; the second cell is a low-frequency band cell; The step of establishing a signaling bearer with the mobile terminal based on the user identifier and signaling request includes: The second base station where the second cell is located sends a third network element message to the first base station where the first cell is located. The third network element message carries at least one of the following: RRC connection establishment, RRC re-establishment message and system information. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal. The first message, used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, includes: The first base station of the first cell sends a second network element message to the second base station where the second cell is located. The second network element message carries the user identifier and the RRC signaling carried by the MSGA. Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, and send at least one of the RRC connection establishment request, RRC re-establishment request and system information type identifier of the terminal request to the second cell; The random access response is reassembled, and the random access response, along with an RRC connection establishment or RRC re-establishment message or system information response, is sent to the mobile terminal.

9. The method according to claim 8, characterized in that, The step of establishing a signaling bearer with the mobile terminal based on the user identifier and signaling request further includes: The user identifier is used to locate the corresponding mobile terminal context information in order to establish a signaling bearer with the mobile terminal.

10. The method according to claim 8, characterized in that, The step of sending a third network element message to the first base station where the first cell is located via the second base station where the second cell is located, wherein the third network element message carries at least one of the following: ... An RRC re-establishment message is generated according to the RRC connection establishment and sent to the first cell; An RRC reset message is generated according to the RRC reset procedure and sent to the first cell; The context information of the mobile terminal is determined by the second user identifier carried by MSG3; System information is generated according to the system information type identifier.

11. A first base station, characterized in that, include: The first receiving module is used to receive random access requests sent by mobile terminals in the first cell; The allocation module is used to allocate user identifiers according to the random access request; The first sending module sends a first message to the corresponding second cell. The first message includes a user identifier and a signaling request allocated by the first cell. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal. Wherein, the first cell is a cell that handles data plane functions, the first base station is the base station where the first cell is located, the second cell is a cell that handles signaling plane functions, the second base station is the base station where the second cell is located, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal; the first cell is a high-frequency band cell; the second cell is a low-frequency band cell; The third receiving unit is used to receive the MSGA sent by the mobile terminal and allocate the user identifier; The first sending module is further configured to send a second network element message to the second base station where the second cell is located via the first base station of the first cell, wherein the second network element message carries the user identifier and the RRC signaling carried by the MSGA; Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, and send at least one of the RRC connection establishment request, RRC re-establishment request and system information type identifier of the terminal request to the second cell; The random access response is reassembled, and the random access response, along with an RRC connection establishment or RRC re-establishment message or system information response, is sent to the mobile terminal.

12. A second base station, characterized in that, include: The second receiving module is used to receive a first message sent by the first cell. The first message includes a user identifier and a signaling request, which are obtained by the first cell based on a random access request sent by the mobile terminal. The connection module is used to establish a signaling bearer with the mobile terminal based on the user identifier and signaling request; Wherein, the first cell is a cell that processes data plane functions, the first base station is the base station where the first cell is located, the second base station is the base station where the second cell is located, the second cell is a cell that processes signaling plane functions, and the signaling request includes at least one of RRC connection establishment request, RRC re-establishment request, and system information type identifier requested by the mobile terminal; the first cell is a high-frequency band cell; the second cell is a low-frequency band cell; The step of establishing a signaling bearer with the mobile terminal based on the user identifier and signaling request includes: The second base station where the second cell is located sends a third network element message to the first base station where the first cell is located. The third network element message carries at least one of the following: RRC connection establishment, RRC re-establishment message and system information. The first message is used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal. The first message, used to assist the second cell in determining the user identifier and establishing a signaling bearer with the mobile terminal, includes: The first base station of the first cell sends a second network element message to the second base station where the second cell is located. The second network element message carries the user identifier and the RRC signaling carried by the MSGA. Calculate the time adjustment amount between the mobile terminal and the first cell and the second cell respectively, and send at least one of the RRC connection establishment request, RRC re-establishment request and system information type identifier of the terminal request to the second cell; The random access response is reassembled, and the random access response, along with an RRC connection establishment or RRC re-establishment message or system information response, is sent to the mobile terminal.

13. A readable storage medium for storing a program, characterized in that, When the program is executed by the processor, it implements the steps of the random access method as described in any one of claims 1 to 7.

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