CN120018322A - Communication network system and connection method - Google Patents
Communication network system and connection method Download PDFInfo
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- CN120018322A CN120018322A CN202311526347.5A CN202311526347A CN120018322A CN 120018322 A CN120018322 A CN 120018322A CN 202311526347 A CN202311526347 A CN 202311526347A CN 120018322 A CN120018322 A CN 120018322A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
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Abstract
本申请提供一种通信网络系统及连接方法，系统包括5G基站和5G核心网，5G基站和5G核心网之间通信连接；5G基站和用户终端之间通信连接，用户终端向5G基站发送RRC恢复消息，其中，RRC恢复消息包括RRC恢复标识；5G基站从RRC恢复消息中提取RRC恢复标识，基于RRC恢复标识获取用户终端的上下文信息，5G基站确定需要恢复连接的用户终端是否需要将RRC维持在处于去激活状态或者是否配置eDRX周期；随后5G基站与5G核心网之间进行信令交互；随后5G基站在确定需要恢复连接的用户终端需要将RRC维持在处于去激活状态时，将用户终端的RRC保持在去激活状态。如此实现轻量化的用户终端的连接恢复和小数据传输兼容的效果。
The present application provides a communication network system and a connection method, the system includes a 5G base station and a 5G core network, the 5G base station and the 5G core network are connected in communication; the 5G base station and the user terminal are connected in communication, the user terminal sends an RRC recovery message to the 5G base station, wherein the RRC recovery message includes an RRC recovery identifier; the 5G base station extracts the RRC recovery identifier from the RRC recovery message, obtains the context information of the user terminal based on the RRC recovery identifier, and the 5G base station determines whether the user terminal that needs to restore the connection needs to maintain the RRC in a deactivated state or whether to configure an eDRX cycle; then the 5G base station and the 5G core network perform signaling interaction; then the 5G base station maintains the RRC of the user terminal in a deactivated state when determining that the user terminal that needs to restore the connection needs to maintain the RRC in a deactivated state. In this way, the connection recovery of the lightweight user terminal and the compatibility of small data transmission are achieved.
Description
Technical Field
The present application relates to communication technologies, and in particular, to a communication network system and a connection method.
Background
With the continuous deployment and wide application of the 5G system, in order to better meet specific requirements of middle-end internet of things devices such as industrial wireless sensors, video monitoring devices and wearable devices on complexity reduction, cost reduction, size reduction, lower energy consumption and the like of the devices, a lightweight (Reduced Capability, redCap for short) user terminal with further reduced complexity and cost is defined.
For a User terminal (User Equipment, UE) with connection management (Connection management, CM) in a Connected state (CM-Connected), but radio resource control (Radio Resource Control, RRC) in a deactivated state (RRC-Inactive), or a User terminal with connection management in an idle state and with a suspension indication, which is optimized by a cellular internet of things 5G system (Cellular Internet of Things 5G System,CIoT 5GS) supporting a User plane, when an upper layer or an Access layer (AS) in a 5G Core Network (5G Core Network, AS) requests to restore the state of radio resource connection of the User terminal from the deactivated state to the Connected state, the 5G system always switches the state of RRC of the User terminal from the deactivated state to the Connected state, without considering a UE small data transfer function (SDT) in the deactivated state, resulting in a problem that connection restoration of the User terminal with light weight and a small data transfer process cannot coexist.
Disclosure of Invention
Some embodiments of the present application provide a communication network system including a 5G base station and a 5G core network;
the 5G base station is in communication connection with the 5G core network, and the 5G base station is in communication connection with the user terminal;
The user terminal sends RRC recovery information to the 5G base station, wherein the RRC recovery information comprises RRC recovery identification;
The 5G base station determines whether the user terminal needing to restore the connection needs to maintain the RRC in a deactivated state or whether the user terminal needing to restore the connection configures an eDRX period, then performs signaling interaction between the 5G base station and the 5G core network, and then the 5G base station maintains the RRC of the user terminal in the deactivated state when the user terminal needing to restore the connection needs to maintain the RRC in the deactivated state.
In some embodiments, signaling interaction is performed between the 5G base station and the 5G core network, which specifically includes that if the accessed 5G base station can acquire the context information of the user terminal, the accessed 5G base station initiates a path switching process of an N2 interface to the 5G core network;
The method comprises the steps that a 5G base station receives an N2 interface notification request sent by an access and mobility management function entity in a 5G core network, and the 5G base station sends an N2 notification to an AMF in the 5G core network, wherein the N2 notification is used for indicating that RRC of a user terminal is in a connection state;
Accordingly, the 5G base station restores the RRC of the user terminal to the connected state when determining that the user terminal requiring restoration of the connection does not need to maintain the RRC in the deactivated state.
In some embodiments, signaling interaction is performed between the 5G base station and the 5G core network, which specifically includes that if the connection recovery process is a response of the 5G core network to RAN paging triggered by the N2 interface flow, the 5G base station and the 5G core network treat the N2 interface flow as a conflict.
In some embodiments, after the accessed 5G base station initiates the path switching process of the N2 interface to the 5G core network, the 5G base station sends an MT communication processing request of the N2 interface to an AMF in the 5G core network, and the AMF in the 5G core network sends an MT communication processing response of the N2 interface to the 5G base station.
In some embodiments, after the signaling interaction between the 5G base station and the 5G core network, the 5G base station determines that the user terminal configures the eDRX cycle, and when the eDRX cycle is greater than a preset threshold, the 5G base station sends an N2 message to the AMF, where the N2 message includes the eDRX cycle.
Some embodiments of the present application provide a connection method applied to a 5G base station, the method including:
The user terminal sends an RRC recovery message to the 5G base station, wherein the RRC recovery message comprises an RRC recovery identifier;
the 5G base station extracts RRC recovery identification from the RRC recovery message, and acquires the context information of the user terminal based on the RRC recovery identification;
The 5G base station determines whether the user terminal needing to be connected again needs to maintain RRC in a deactivated state or whether the user terminal needing to be connected again configures an eDRX period;
and when the user terminal needing to restore the connection is determined to be required to maintain the RRC in a deactivated state, the RRC of the user terminal is maintained in the deactivated state.
In some embodiments, the signaling interaction between the 5G base station and the 5G core network specifically includes:
If the accessed 5G base station can acquire the context information of the user terminal, the accessed 5G base station initiates a path switching process of an N2 interface to the 5G core network;
the 5G base station receives an N2 interface notification request sent by an access and mobility management functional entity in a 5G core network;
the 5G base station sends an N2 notice to an AMF in the 5G core network, wherein the N2 notice is used for indicating that RRC of the user terminal is in a connection state;
Correspondingly, the connecting method further comprises the following steps:
and the 5G base station restores the RRC of the user terminal to the connection state when determining that the user terminal needing to restore the connection does not need to maintain the RRC in the deactivated state.
In some embodiments, the signaling interaction between the 5G base station and the 5G core network specifically includes:
If the connection recovery process is a response of the 5G core network to RAN paging triggered by the N2 interface flow, the 5G base station and the 5G core network treat the N2 interface flow as conflict.
In some embodiments, after the accessed 5G base station initiates the path switching procedure of the N2 interface to the 5G core network, the method further includes:
the 5G base station sends MT communication processing request of N2 interface to AMF in 5G core network, and AMF in 5G core network sends MT communication processing response of N2 interface to 5G base station.
In some embodiments, after the signaling interaction between the 5G base station and the 5G core network, the method further includes determining that the user terminal configures an eDRX period by the 5G base station, and when the eDRX period is greater than a preset threshold, the 5G base station sends an N2 message to the AMF, wherein the N2 message includes the eDRX period.
According to the communication network system and the connection method provided by the application, when the RRC of the user terminal is in a deactivated state, an RRC recovery message is initiated, the 5G base station acquires the context information of the user terminal based on the recovery identifier, the 5G base station determines whether the user terminal needing to be recovered to be connected needs to be maintained in the deactivated state or whether the user terminal needing to be recovered to be connected configures an eDRX period, the 5G base station performs signaling interaction with the 5G core network, and then, when the user terminal needing to be recovered to be connected needs to be maintained in the deactivated state, the RRC of the user terminal UE is maintained in the deactivated state. Thus, the effect of connection recovery and small data transmission compatibility of the light-weight user terminal is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic diagram of a communication network system according to some embodiments of the present application;
FIG. 2 is a schematic diagram of a connection method according to some embodiments of the present application;
FIG. 3 is a schematic diagram of a connection method according to other embodiments of the present application;
fig. 4 is a schematic view of a connection device according to still other embodiments of the present application.
Specific embodiments of the present application have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or fully authorized by each party, and the collection, use and processing of the related data need to comply with the related laws and regulations and standards of the related country and region, and provide corresponding operation entries for the user to select authorization or rejection.
With the continuous deployment and wide application of 5G systems, specific requirements on equipment complexity reduction, cost reduction, size reduction, lower energy consumption and the like are met for better meeting middle-end Internet of things equipment such as industrial wireless sensors, video monitoring equipment, wearable equipment and the like. In Rel-17, 3GPP defines a lightweight (Reduced Capability, abbreviated as RedCap) user terminal type in order to further reduce terminal complexity and cost.
5G (NR) wireless networks place higher demands on capacity, latency and efficiency, but small data (e.g., short message) transceiving services often occur in everyday applications. In order to solve the problem that the frequent radio connection recovery in the data Transmission process causes unnecessary power consumption and signaling overhead of the UE, the 3GPP proposes a special scheme for small data Transmission (SMALL DATA Transmission, abbreviated as SDT) of the user terminal in the radio resource control deactivated state, that is, defines an SDT function, specifically, allows the user terminal to perform data or signaling Transmission while maintaining the RRC in the deactivated state without switching to the RRC in the connected state (RRC-connected). Therefore, the SDT function is also one of important low power consumption characteristics of the lightweight user terminal.
However, the user terminal UE in a connected state for connection management but RRC in a deactivated state, or the user terminal supporting cellular internet of things 5G system optimization of the user plane, connection management in a connected state and with a suspension indication. When an upper layer or an Access layer (AS, abbreviated AS Access Stratum) in the 5G core network requests to restore the state of the radio resource connection of the ue from the deactivated state to the connected state, the ue initiates a request to establish a connection restoration process of RRC between the ue and the 5G core network, and the 5G core network switches the state of RRC of the ue from the deactivated state to the connected state, so that a small data transfer function (SDT) is not implemented, resulting in a problem that the connection restoration of the lightweight ue and the small data transfer process cannot coexist.
For mobile terminal downlink (Mobile Terminated, abbreviated as CN) communication processing based on Core Network, specifically, the method includes allowing the Core Network to apply a high-delay communication function, that is, when the UE uses a power saving function in a connection management state or an RRC deactivation state, or when the UE uses satellite access with discontinuous coverage and the UE is not reachable, supporting high-delay communication by extending downlink data buffer in a user plane function entity (User Plane Function, abbreviated as UPF), a user plane function entity (Session Management Function, abbreviated as SMF) or a Network capability opening function entity (Network Exposure Function, abbreviated as NEF).
Furthermore, MT communication processing is incompatible with small data transmission. Especially in case the lightweight user terminal starts an extended discontinuous reception period (Extended Discontinuous Reception cycle: eDRX) mechanism.
In view of this, a dedicated scheme for a connection recovery procedure is required for a lightweight user terminal in a deactivated state in the case of small data transmission.
The technical conception of the application is that whether the state switching of the light user terminal is carried out or not is finally determined by adding the service type judgment. And the eDRX cycle is reported to the lightweight user terminal starting the eDRX mechanism, so that the network side can normally execute MT communication processing.
It should be noted here that the schemes involved in the embodiments described below can be explained in combination with each other.
Example 1
Fig. 1 is a schematic diagram of a communication network system according to some embodiments of the present application, and as shown in fig. 1, some embodiments of the present application provide a communication network system including a 5G base station and a 5G core network. The 5G base station is in communication connection with the 5G core network. And the 5G base station is in communication connection with the user terminal.
The user terminal transmits an RRC restoration message to the 5G base station. Wherein the RRC recovery message includes an RRC recovery identifier. The 5G base station extracts the RRC recovery identifier from the RRC recovery message, and acquires the context information of the user terminal based on the RRC recovery identifier. The 5G base station determines whether the user terminal, which needs to resume the connection, needs to maintain RRC in a deactivated state. Signaling interaction between the 5G base station and the 5G core network. The 5G base station maintains the RRC of the user terminal UE in a deactivated state when determining that the user terminal requiring connection restoration needs to maintain the RRC in the deactivated state.
More specifically, the RRC recovery message is initiated when the RRC of the user terminal is in a deactivated state. The user terminal provides an RRC resume identity to the 5G base station, the 5G base station extracts the RRC resume identity from the RRC resume message in response to the RRC resume message, and the 5G base station performs user terminal context acquisition based on the resume identity (UE context Retrival). When the local area of the 5G base station accessed by the user terminal which tries to restore the connection is unavailable, the 5G base station performs a user terminal context acquisition process.
The 5G base station communicates with the user terminal requiring restoration of connection based on the context information of the user terminal, and determines whether the user terminal requiring restoration of connection needs to be in a deactivated state of RRC or whether the user terminal requiring restoration of connection configures an eDRX period. I.e. to determine if the user terminal recovering the connection needs to enter into a small data transmission. If the small data transmission is not required to be entered, the 5G base station determines that the RRC of the user terminal should be switched from the deactivated state to the connected state, and if the small data transmission is required to be entered, the 5G base station determines that the RRC of the user terminal is kept in the deactivated state.
And then the signaling interaction between the 5G base station and the 5G core network is realized. More specifically, an N2 interface path may be switched between the 5G base station and the 5G core network, and an N2 interface announcement may also be sent between the 5G base station and the 5G core network. The 5G base station maintains the RRC of the user terminal UE in a deactivated state when determining that the user terminal requiring connection restoration needs to maintain the RRC in the deactivated state.
And when the 5G base station determines that the user terminal configures the eDRX period and the eDRX period is larger than a preset threshold, the 5G base station sends an N2 message to the AMF, wherein the N2 message comprises the eDRX period. So that the 5G core network can perform MT communication processing.
In the above technical solution, when the RRC of the UE is in a deactivated state, an RRC resume message is initiated, the 5G base station obtains context information of the UE based on the resume identifier, and the 5G base station determines whether the UE that needs to resume connection needs to maintain the RRC in the deactivated state, and after that, the UE that needs to resume connection needs to maintain the RRC in the deactivated state by signaling interaction between the 5G base station and the 5G core network. Thus, the effect of connection recovery and small data transmission compatibility of the light-weight user terminal is achieved. The 5G base station determines that the user terminal configures the eDRX period and reports the eDRX period so that the 5G core network can perform MT communication processing, and the MT communication processing can be continued under the condition that the eDRX mechanism is started.
Example two
Some embodiments of the present application provide a communication network system including a 5G base station and a 5G core network. The 5G base station is in communication connection with the 5G core network. And the 5G base station is in communication connection with the user terminal.
The user terminal transmits an RRC restoration message to the 5G base station. Wherein the RRC recovery message includes an RRC recovery identifier. And the 5G base station acquires the context information of the user terminal based on the recovery identifier. The 5G base station determines whether the user terminal requiring restoration of connection needs to be in a deactivated state of RRC or whether the user terminal requiring restoration of connection configures eDRX cycle.
If the connection recovery procedure is a response of the 5G core network to RAN paging triggered by the N2 interface procedure, the 5G base station treats the N2 interface procedure as conflict treatment. In addition, the 5G core network also treats the N2 interface flow as a collision, and then the flow ends.
If the accessed 5G base station can acquire the context information of the user terminal, the accessed 5G base station initiates a path switching process of the N2 interface to the 5G core network. That is, an Xn-based 5G inter-base station handoff procedure includes Xn data forwarding.
After the accessed 5G base station initiates a path switching process of an N2 interface to the 5G core network, the 5G base station receives an N2 interface notification request sent by an access and mobility management functional entity (ACCESS AND Mobility Management Function, abbreviated as AMF) in the 5G core network. The N2 interface advertisement request is used to acquire RRC state change advertisement. The 5G base station sends an N2 announcement to the AMF in the 5G core network. Wherein the RRC of the user terminal is indicated to be in a connected state.
And the 5G base station restores the RRC of the user terminal UE to the connection state when determining that the user terminal needing to restore the connection does not need to maintain the RRC in the deactivated state.
In the above technical solution, if the accessed 5G base station can acquire the context information of the user terminal, the accessed 5G base station initiates the path switching process of the N2 interface, and if the connection recovery process is a response of the 5G core network to RAN paging triggered by the N2 interface flow, the 5G base station and the 5G core network take the N2 interface flow as conflict processing, so as to adapt to N2 interface path switching under different conditions.
Example III
Some embodiments of the present application provide a communication network system including a 5G base station and a 5G core network. The 5G base station is in communication connection with the 5G core network. And the 5G base station is in communication connection with the user terminal.
The user terminal transmits an RRC restoration message to the 5G base station. Wherein the RRC recovery message includes an RRC recovery identifier. And the 5G base station acquires the context information of the user terminal based on the recovery identifier. The 5G base station determines whether the user terminal requiring restoration of connection needs to be in a deactivated state of RRC or whether the user terminal requiring restoration of connection configures eDRX cycle.
If the accessed 5G base station can acquire the context information of the user terminal, the accessed 5G base station initiates a path switching process of the N2 interface to the 5G core network.
If a MT communication processing process based on CN is performed between the 5G base station and the 5G core network before the user terminal resumes connection, the 5G base station sends an MT communication processing request of an N2 interface to the AMF, and indicates that the user terminal can access downlink data and/or signaling currently. AMF in the 5G core network sends MT communication processing response of the N2 interface to the 5G base station.
After the 5G base station issues an MT communication processing request of the N2 interface to the AMF, the AMF requests data buffering. The AMF in the 5G core network sends a PDU session update SM context (Nsmf _ PDUSession _ UpdateSMContext) request to the SMF in the 5G core network. Indicating to issue downstream data for each PDU session with active user plane. If the data is buffered in the UPF, the SMF in the 5G core network modifies the flow through the N4 session and updates the UPF by using the applicable rule to trigger the data delivery. The SMF in the 5G core network sends a PDU session update SM context response to the AMF in the 5G core network. The AMF in the 5G core network then sends an MT communication handling response of the N2 interface to the 5G base station.
In some embodiments, after the AMF in the 5G core network sends the MT communication handling response of the N2 interface to the 5G base station, the 5G base station maintains the RRC of the user terminal in a deactivated state when it is determined that the user terminal that needs to resume connection needs to maintain the RRC in a deactivated state.
In some embodiments, after the AMF in the 5G core network sends the MT communication processing response of the N2 interface to the 5G base station, the 5G base station determines that the user terminal configures the eDRX cycle, and when the eDRX cycle is greater than a preset threshold, the 5G base station sends an N2 message to the AMF, where the N2 message includes the eDRX cycle.
More specifically, if the user terminal UE configures an eDRX cycle, which is a cycle in which RRC remains in a deactivated state, and the eDRX cycle is greater than 10.24s, the 5G base station may transmit an N2 message to the AMF, providing an eDRX cycle value in which RRC is in a deactivated state, so that the 5G core network may perform MT communication processing.
In some embodiments, after the 5G base station maintains the RRC of the user terminal in the deactivated state when it is determined that the user terminal that needs to resume connection needs to maintain the RRC in the deactivated state, the 5G base station initiates a MT communication processing procedure based on the core network when receiving a message sent by the user terminal.
In some embodiments, when the 5G base station determines that the eDRX cycle is configured by the user terminal and the eDRX cycle is greater than a preset threshold, after the 5G base station sends an N2 message to the AMF, the 5G base station initiates an MT communication processing flow based on the core network when receiving the message sent by the user terminal.
When the 5G base station receives a message sent by the user terminal, that is, the 5G base station receives a DL NAS message, and the user UE is in a deactivated state, wherein the deactivated state configures an eDRX period and is considered as unreachable, the 5G base station indicates that NAS information is not issued to the AMF, and then initiates MT communication processing based on a core network.
In the above technical solution, when the RRC of the ue is in a deactivated state, an RRC resume message is initiated, the 5G base station obtains context information of the ue based on the resume identifier, the 5G base station determines whether the ue that needs to resume connection needs to maintain the RRC in the deactivated state, MT communication processing is performed between the 5G base station and the 5G core network, the 5G base station initiates an MT communication processing request to the 5G core network, and then when it is determined that the ue that needs to resume connection needs to maintain the RRC in the deactivated state. Thus, MT communication processing is compatible with small data transmission. And after determining that the user terminal configures the eDRX cycle, the 5G base station transmits the eDRX cycle to the 5G core network, so that the 5G core network can perform MT communication processing, and the MT communication processing can be continued under the condition that the eDRX mechanism is started.
Example IV
Fig. 2 is a schematic diagram of a connection method according to some embodiments of the present application, and as shown in fig. 2, some embodiments of the present application provide a connection method, where the connection method specifically includes the following steps:
S101, the user terminal sends RRC recovery information to the 5G base station.
Wherein the RRC recovery message includes an RRC recovery identifier.
More specifically, the RRC recovery message is initiated when the RRC of the user terminal is in a deactivated state. The user terminal provides the RRC recovery identifier to the 5G base station, and the 5G base station accesses the context information of the user terminal based on the recovery identifier.
S102, the 5G base station acquires the context information of the user terminal based on the recovery identification.
Wherein, the 5G base station responds to the RRC recovery message, extracts the RRC recovery identifier from the RRC recovery message, and the 5G base station executes the user terminal context acquisition (UE context Retrival) based on the recovery identifier.
Wherein, when the local of the 5G base station accessed by the user terminal attempting to restore the connection is unavailable, the 5G base station performs a user terminal context acquisition process.
S103, the 5G base station determines whether the user terminal requiring restoration of connection needs to maintain RRC in a deactivated state or whether the user terminal requiring restoration of connection configures eDRX cycle.
The 5G base station communicates with the user terminal needing to restore the connection based on the context information of the user terminal, and determines whether the user terminal needing to restore the connection needs to be in a deactivated state or not. I.e. to determine if the user terminal recovering the connection needs to enter into a small data transmission.
If the small data transmission is not required to be entered, the 5G base station determines that the RRC of the user terminal should be switched from the deactivated state to the connected state, and if the small data transmission is required to be entered, the 5G base station determines that the RRC of the user terminal is kept in the deactivated state.
S104, signaling interaction between the 5G base station and the 5G core network is carried out, and the process jumps to S104 or S105.
The 5G base station and the 5G core network can switch N2 interface paths, and the 5G base station and the 5G core network can also send N2 interface notices.
And S105, the 5G base station keeps the RRC of the user terminal in a deactivated state when determining that the user terminal needing to restore the connection needs to keep the RRC in the deactivated state.
S106, the 5G base station determines that the user terminal configures the eDRX period, and when the eDRX period is larger than a preset threshold, the 5G base station sends an N2 message to the AMF, wherein the N2 message comprises the eDRX period.
This is so that the 5G core network can perform MT communication processing.
In the above technical solution, when the RRC of the UE is in a deactivated state, an RRC resume message is initiated, the 5G base station obtains context information of the UE based on the resume identifier, and the 5G base station determines whether the UE that needs to resume connection needs to maintain the RRC in the deactivated state, and after that, the UE that needs to resume connection needs to maintain the RRC in the deactivated state by signaling interaction between the 5G base station and the 5G core network. Thus, MT communication processing is compatible with small data transmission. And after determining that the user terminal configures the eDRX cycle, the 5G base station transmits the eDRX cycle to the 5G core network, so that the 5G core network can perform MT communication processing, and the MT communication processing can be continued under the condition that the eDRX mechanism is started.
Example five
Fig. 3 is a schematic diagram of a connection method according to another embodiment of the present application, and as shown in fig. 3, some embodiments of the present application provide a connection method, where the connection method specifically includes the following steps:
s201, the user terminal sends RRC recovery information to the 5G base station.
Wherein the RRC recovery message includes an RRC recovery identifier.
S202, the 5G base station acquires the context information of the user terminal based on the recovery identification.
S203, the 5G base station determines whether the user terminal requiring connection restoration needs to be in a deactivated state or whether the user terminal requiring connection restoration configures an eDRX cycle.
S204a, if the accessed 5G base station can acquire the context information of the user terminal, the accessed 5G base station initiates a path switching process of an N2 interface to the 5G core network, and then jumps to S105.
That is, an Xn-based 5G inter-base station handoff procedure includes Xn data forwarding.
S204b, if the connection recovery process is the response of the RAN paging triggered by the N2 interface flow by the 5G core network, the 5G base station regards the N2 interface flow as conflict treatment. In addition, the 5G core network also treats the N2 interface flow as a collision, and then the flow ends.
S205, the 5G base station receives an N2 interface notification request sent by an access and mobility management function entity (ACCESS AND Mobility Management Function, abbreviated as AMF) in the 5G core network.
The N2 interface advertisement request is used to acquire RRC state change advertisement.
S206, the 5G base station sends an N2 interface notice to an AMF in the 5G core network.
Wherein the N2 interface advertisement indicates that the RRC of the user terminal is in a connected state.
S207, the 5G base station restores the RRC of the user terminal to the connected state when determining that the user terminal that needs to restore the connection does not need to maintain the RRC in the deactivated state.
In the above technical solution, if the accessed 5G base station can acquire the context information of the user terminal, the accessed 5G base station initiates the path switching process of the N2 interface, and if the connection recovery process is a response of the 5G core network to RAN paging triggered by the N2 interface flow, the 5G base station and the 5G core network take the N2 interface flow as conflict processing, so as to adapt to N2 interface path switching under different conditions.
Example six
Fig. 4 is a schematic diagram of a connection method according to another embodiment of the present application, and as shown in fig. 4, some embodiments of the present application provide a connection method, which specifically includes the following steps:
s301, the user terminal sends RRC recovery information to the 5G base station.
Wherein the RRC recovery message includes an RRC recovery identifier.
More specifically, the RRC recovery message is initiated when the RRC of the user terminal is in a deactivated state. The user terminal provides a recovery identifier to the 5G base station, and the 5G base station accesses the context information of the user terminal based on the recovery identifier.
S302, the 5G base station acquires the context information of the user terminal based on the recovery identification.
Wherein, the 5G base station responds to the RRC recovery message, extracts the recovery identifier from the RRC recovery message, and the 5G base station executes the user terminal context acquisition (UE context Retrival) based on the recovery identifier.
Wherein, when the user terminal context information associated with the user terminal attempting to restore the connection is unavailable in the local area of the 5G base station accessed by the user terminal, the 5G base station performs a user terminal context acquisition process, and performs a terminal context acquisition (UE context Retrival) operation.
S303, the 5G base station determines whether the user terminal needing to resume connection needs to be in a deactivated state or whether the user terminal needing to resume connection configures eDRX cycle.
The 5G base station communicates with the user terminal needing to restore the connection based on the context information of the user terminal, and determines whether the user terminal needing to restore the connection needs to be in a deactivated state or not. I.e. to determine if the user terminal recovering the connection needs to enter into a small data transmission.
If the small data transmission is not required to be entered, the 5G base station determines that the RRC of the user terminal should be switched from the deactivated state to the connected state, and if the small data transmission is required to be entered, the 5G base station determines that the RRC of the user terminal is kept in the connected state.
S304, if the accessed 5G base station can acquire the context information of the user terminal, the accessed 5G base station initiates a path switching process of an N2 interface to the 5G core network.
S305, the 5G base station sends MT communication processing request of the N2 interface to AMF in the 5G core network.
If a MT communication processing process based on CN is performed between the 5G base station and the 5G core network before the user terminal resumes connection, the 5G base station sends an MT communication processing request of an N2 interface to the AMF, and indicates that the user terminal can access downlink data and/or signaling currently.
S306, the AMF in the 5G core network sends a PDU session update SM context request to the SMF in the 5G core network.
When a MT communication processing procedure based on CN is performed between the 5G base station and the 5G core network, the AMF requests data buffering. The AMF sends a PDU session update SM context (Nsmf _ PDUSession _ UpdateSMContext) request to the SMF. Indicating to issue downstream data for each PDU session with active user plane.
S307, if the data is cached in the UPF, the SMF in the 5G core network modifies the flow through the N4 session, and updates the UPF by using the applicable rule so as to trigger the data to be issued.
S308, the SMF in the 5G core network sends a PDU session update SM context response to the AMF in the 5G core network.
And S309, the AMF in the 5G core network sends MT communication processing response of the N2 interface to the 5G base station, and the process goes to S310 or S311.
And S310, when the 5G base station determines that the user terminal needing to restore the connection needs to maintain the RRC in a deactivated state, the RRC of the user terminal is maintained in the deactivated state, and the process jumps to S312.
And S311, the 5G base station determines that the user terminal configures the eDRX period, and when the eDRX period is larger than a preset threshold, the 5G base station sends an N2 message to the AMF, wherein the N2 message comprises the eDRX period, and the step S312 is performed.
If the user equipment UE configures an eDRX cycle, the eDRX cycle is a cycle in which the RRC is kept in a deactivated state, and the eDRX cycle is greater than 10.24s, the 5G base station may send an N2 message to the AMF, and provide an eDRX cycle value in which the RRC is in a deactivated state, so that the 5G core network may perform MT communication processing.
And S312, when receiving the message sent by the user terminal, the 5G base station initiates MT communication processing flow based on the core network.
When the 5G base station receives a message sent by the user terminal, that is, the 5G base station receives a DL NAS message, and the user UE is in a deactivated state, wherein the deactivated state configures an eDRX period and is considered as unreachable, the 5G base station indicates that NAS information is not issued to the AMF, and then initiates MT communication processing based on a core network.
In the above technical solution, when the RRC of the UE is in a deactivated state, an RRC resume message is initiated, the 5G base station obtains context information of the UE based on the resume identifier, the 5G base station determines whether the UE that needs to resume connection needs to maintain the RRC in the deactivated state, and after determining that MT communication processing is performed between the 5G base station and the 5G core network, the 5G base station initiates an MT communication processing request to the 5G core network, and then when it is determined that the UE that needs to resume connection needs to maintain the RRC in the deactivated state, the RRC of the UE is maintained in the deactivated state. Thus, MT communication processing is compatible with small data transmission. And after determining that the user terminal configures the eDRX cycle, the 5G base station transmits the eDRX cycle to the 5G core network, so that the 5G core network can perform MT communication processing, and the MT communication processing can be continued under the condition that the eDRX mechanism is started.
The embodiment of the application also provides a computer readable storage medium, wherein computer instructions are stored in the computer readable storage medium, and when the processor executes the computer instructions, the steps of the method in the embodiment are realized.
Embodiments of the present application also provide a computer program product comprising computer instructions which, when executed by a processor, implement the steps of the method of the above embodiments.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
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| CN202311526347.5A CN120018322A (en) | 2023-11-14 | 2023-11-14 | Communication network system and connection method |
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