CN1941993A - Method for controlling mobile-terminal text - Google Patents

Abstract

The present invention relates to mobile communication technology, in particular to a control method for transferring context according to the location of a mobile terminal when a mobile terminal is in a dormant state or an idle state under an evolved network architecture, so as to solve the problem in the prior art that frequent context transfers occupy system resources. The method includes: when the mobile terminal source edge wireless base station ERS1 enters the idle state or the dormant state, saves the radio access network context and the mobile terminal identity of the mobile terminal, and monitors the state of the mobile terminal; the ERS1 monitors When the mobile terminal remains idle or dormant in the cell until the first time threshold, the saved radio access network context and mobile terminal identifier are sent to the IP access gateway where the ERS1 is located to continue saving, Then delete the local record and release the wireless resources.

Description

A method for controlling the context of a mobile terminal

technical field

The present invention relates to mobile communication technology, in particular to a control method for transferring context according to the location of the mobile terminal when the mobile terminal is in a dormant state or idle state under an evolved network architecture.

Background technique

UMTS (Universal Mobile Telecommunications System, universal mobile communication system) is a third-generation mobile communication system that adopts WCDMA (Wideband Code Division Multiple Access, wideband code division multiple access) air interface technology, and the UMTS system is usually called WCDMA communication system.

The UMTS system structure is shown in Figure 1. It adopts a structure similar to that of the second-generation mobile communication system, including RAN (Radio Access Network, wireless access network) and CN (Core Network, core network). Among them, RAN is used to handle all wireless-related functions, while CN handles all voice calls and data connections in the UMTS system, and realizes switching and routing functions with external networks. CN is logically divided into CS (Circuit Switched Domain, circuit switched domain) and PS (Packet Switched Domain, packet switched domain), and UTRAN (UMTS Territorial Radio Access Network UMTS, land wireless access network), CN and UE (User Equipment, User Equipment) together constitute the entire UMTS system, and the UMTS system is connected to external networks, such as PSTN and the Internet.

UTRAN is the terrestrial radio access network. The network structure is shown in Figure 2, including one or several RNS (Radio Network Subsystem, wireless network subsystem). An RNS consists of an RNC (Radio Network Controller, radio network controller) and one or more NodeBs (base stations). The interface between the RNC and the CN is the Iu interface, and the NodeB and the RNC are connected through the Iub interface. Within UTRAN, RNCs are interconnected through Iur, and Iur can be connected through direct physical connection between RNCs or through a transmission network. RNC is used to allocate and control the wireless resources of NodeBs connected or related to it. NodeB completes the conversion of data flow between Iub interface and Uu interface, and also participates in part of wireless resource management, among which:

1. NodeB is the base station (that is, the wireless transceiver) of the WCDMA system, including the wireless transceiver and baseband processing components. Through the standard Iub interface and RNC interconnection, it mainly completes the processing of the Uu interface physical layer protocol. The main functions are spread spectrum, modulation, channel coding and despreading, demodulation, channel decoding, and also include the mutual conversion of baseband signals and radio frequency signals. and other functions.

2. The RNC is a radio network controller, which is used to control the radio resources of the UTRAN, and mainly completes functions such as connection establishment and disconnection, handover, macro-diversity combination, and radio resource management and control.

3. Iu series interfaces are used in UTRAN, including Iu, Iur and Iub interfaces.

The core network structure of the 3GPS domain is shown in Figure 3, where:

1. SGSN (Serving GPRS Support Node, Serving GPRS Support Node) is a basic component network element of the PS network. Its main function is to forward input/output IP packets for the UEs in the service area of the SGSN, and its status is similar to that of the VMSC in the CS domain. SGSN provides the following functions:

The routing and forwarding function of packet data packets in this SGSN area provides services for all PS (Packet Switched) users in this SGSN area; encryption and authentication functions; session management functions; mobility management functions; same as UTRAN , GGSN, HLR, MSC, SMS-GMSC, SMS-IWMSC and other interface functions; bill generation and output functions, mainly to collect the usage of wireless resources by users; in addition, SGSN also integrates VLR (Visitor LocationRegister, access location register) function, when the user is in the Attached (attached) state, the user information and location information related to the group are stored in the SGSN. Similar to VLR, most of the user information in SGSN is obtained from HLR during location update.

2. GGSN (Gateway GPRS Support Node, Gateway GPRS Support Node) is also a network element functional entity introduced to provide PS service functions in the UMTS network, providing routing and encapsulation of data packets between the PS network and the external data network . Which GGSN the user chooses as the gateway is determined according to the subscription information of the user and the access point name (APN) requested by the user during the PDP context activation process. GGSN mainly provides the following functions:

With the interface function of the external IP packet network, the GGSN needs to provide the gateway function for the UE to access the external packet network. From the perspective of the external network, the GGSN is like a router that can address all user IPs in the PS network. Exchanging routing information; session management, completing the communication establishment process between the UE and the external network; the function of sending the mobile user's packet data to the correct SGSN; the generation and output of the call list, which mainly reflects the user's use of the external network; migration (relocation, Relocation).

SRNS Relocation is the process of transferring the SRNC role of a certain UE from one RNC to another RNC. Before SRNS Relocation, the SRNC (Serving RNC) of the UE is called SourceRNC, and the target RNC that will assume the role of SRNC is called Target RNC, Source RNC and TargetRNC are the titles for different RNCs in an SRNS Relocation process.

Lossless relocation (lossless Relocation) means that no data is lost during relocation. It is mainly used in AM mode (confirmation mode), and data and PDCP sequence numbers need to be transferred between two RNCs.

Currently in 3GPP, various manufacturers are actively researching LTE (Long Term Evolution). The purpose of LTE is to provide a low-cost network that can reduce delay, increase user data rate, improve system capacity and coverage. Only PS domain services are used, and the bearer network is IP bearer. Among them: a more popular two-layer node architecture is shown in Figure 4. Under this architecture, ERS (Edge Radio Station, edge wireless base station) is an evolved Node B, which has most of the functions of the previous RNC, and Adopting new physical layer technology, IAGW (IP Access Gate Way, IP Access Gateway) has some functions of SGSN and previous GGSN functions. The interface between the IAGW and the ERS is an E-I interface, which is generally required to be an IP link in the evolution architecture.

In the evolved network, in the RAN/CN functional separation table, Location management, Paging, Intra-radio access mobility in LTE_IDLE are important items. The current trend is that the UE has Detached (separated, ie power-off state), IDLE (idle, ie standby state), Active (active state) and Dormant (sleeping, ie power-saving state) states.

Among them, the Detached state is a detached state, and the CN and the RAN do not store information such as the mobility of the UE. The IDLE state is similar to the existing IDLE state. Only the CN stores the UE's mobility context (MMContext), and the RAN generally does not store UE-related information (some manufacturers also propose to store information in the RAN). The Active state is the normal communication state of the UE, which establishes a connection with the network. Both RAN and CN have information about the UE. The RAN stores the RAN context of the UE related to wireless communication, and the CN stores the mobile management context (MM Context) and PDP context of the UE; Dormant The state is the dormant state of the UE, in which the session is not released, but the UE is not active and is in power saving mode. When the business continues, the business can be quickly restored. The DORMANT state is similar to the URA_PCH state of the UMTS network. It is hoped that the RAN Context of the UE is saved, and the MM Context and PDP context of the UE are saved by the CN, so that services can be quickly restored. When the UE is in the Idle state and Dormant state, the RAN side The RAN Context needs to be transferred. According to the change of the routing area to which the UE belongs, the MM Context and/or PDP context of the UE needs to be transferred so that the UE can re-communicate as soon as possible.

For an evolved network with two layers of nodes (or other networks where the protocol stack is at the bottom node), the movement of UEs in the Idle state and Dormant state between ERSs will lead to frequent transfers of the UE's RAN Context. However, the UE may not always restore services. Because the silent time of many UEs is long, services may be initiated across multiple ERS, or even no longer be initiated. Under such conditions, frequent transfer of Context will have a certain impact on the network.

Contents of the invention

The present invention provides a mobile terminal context control method to solve the problem in the prior art that frequent transfer of Context occupies system resources.

A method for controlling the context of a mobile terminal, comprising the steps of:

A1, the edge wireless base station (ERS1) where the mobile terminal is located, saves the radio access network (RAN) context and the mobile terminal identifier of the mobile terminal when the mobile terminal enters the idle state or dormant state, and monitors the state of the mobile terminal;

A2. When the ERS1 monitors that the mobile terminal remains idle or sleeps in the cell and reaches the first time threshold, it sends the RAN context and the mobile terminal identifier to the IP access gateway where the ERS1 is located ( IAGW1) continues to save, and then deletes the local record and releases the E-I interface with the IAGW1 and the wireless resource with the wireless terminal.

Before the arrival of the first time threshold, when the cell where the mobile terminal is located changes, the step A1 further includes the following steps:

A12', the mobile terminal initiates a cell update;

A13', the ERS before the update sends the RAN context of the mobile terminal to the ERS after the update for further storage, then deletes the local record and releases the E-I interface and wireless resources;

A14', the updated ERS establishes wireless resources according to the RAN context, and when the first time threshold is detected, the ERS sends the RAN context and mobile terminal identifier to the IAGW1 for further storage, and then deletes Record and release E-I interface and wireless resources locally.

The steps between A2' and A3' further include: the ERS where the update is located requests the RAN context of the mobile terminal from the ERS before the update.

Before the arrival of the first time threshold, when the cell where the mobile terminal is located changes, the step A1 further includes the following steps:

A22', the mobile terminal initiates a cell update;

A22', the ERS after the update notifies the ERS before the update to send the RAN context of the mobile terminal to the IAGW1 for storage;

A23', after the ERS before the update receives the notification, it sends the RAN context of the mobile terminal to the IAGW1 for continued storage, then deletes the local record and releases the E-I interface and wireless resources.

The IAGW1 also saves the mobility management (MM) context containing the address information of the routing area where the mobile terminal is located;

When the mobile terminal is in the dormant state, the IAGW1 also saves the MM context of the mobile terminal including the address information of the routing area where the mobile terminal is located and the packet data protocol (PDP) context including the information of the IAGW where the mobile terminal is located .

When the routing area of the mobile terminal changes, the method further includes: the mobile terminal initiates a routing area update; and the IAGW1 updates the route in the routing area in the MM context according to the routing area where the mobile terminal is updated. District address information.

When the IAGW where the mobile terminal is located changes, the method further includes:

When the mobile terminal is in an idle state, the IAGW where the mobile terminal was before the update sends the RAN context and MM context of the mobile terminal to the IAGW where the mobile terminal is after the update to continue saving and delete the local record ;

When the mobile terminal is in the dormant state, the IAGW where the mobile terminal is located before the update sends the RAN context, MM context, and PDP context of the mobile terminal to the IAGW where the mobile terminal is located after the update to continue saving, and delete the local record; and the updated IAGW updates the IAGW information of the mobile terminal contained in the PDP context, and notifies the gateway IAGW of the mobile terminal of the update result.

When the network side pages the mobile terminal in the idle state or the dormant state or sends data to the mobile terminal in the idle state or the dormant state, the method further includes:

The network side searches for the IAGW where the mobile terminal is currently located and sends the data or paging message to the IAGW;

The IAGW judges whether the E-I interface corresponding to the mobile terminal has been released, if not, sends a paging message or data through the E-I interface; if so, rebuilds the E-I interface corresponding to the mobile terminal and according to the MM context of the mobile terminal The address information of the routing area in the routing area sends a paging message carrying the mobile terminal identifier to all ERS located in the corresponding routing area, and sends the saved RAN context to all ERS to which it belongs;

All ERS in the routing area simultaneously send a paging message carrying the mobile terminal identifier;

When the mobile terminal receives the paging message sent by the ERS of the cell where it is located, it sends a radio resource re-establishment request to the ERS of the cell where it is located;

When the ERS in the cell receives the re-establishment request, it re-establishes the radio resources of the mobile terminal according to the information in the RAN context and returns a re-establishment success response message to the mobile terminal. discarding said RAN context upon arrival;

The IAGW sends a paging message or data through the re-established E-I interface, and the mobile terminal receives the paging message or data through the re-established radio resource.

When the network side pages the mobile terminal in the idle state or the dormant state or sends data to the mobile terminal in the idle state or the dormant state, the method further includes:

The network side searches for the IAGW where the mobile terminal is currently located and sends the data or paging message to the IAGW;

Whether the E-I interface corresponding to the mobile terminal of the IAGW has been released, if otherwise, paging or data is issued through the E-I interface; The address information of the routing area sends a paging message carrying the identification of the mobile terminal to all ERS located in the routing area;

All ERS in the routing area simultaneously send the paging message carrying the mobile terminal identifier;

When the mobile terminal receives the paging message sent by the ERS of the cell where it is located, it sends a radio resource re-establishment request to the ERS of the cell where it is located;

When the ERS of the cell where the mobile terminal is located receives the re-establishment request, it requests the RAN context of the mobile terminal from the IAGW;

The IAGW sends the corresponding RAN context to the ERS of the cell where the mobile terminal is located;

The ERS of the cell where the mobile terminal is located re-establishes radio resources according to the RAN context and returns a re-establishment success response message to the mobile terminal;

The mobile terminal establishes communication with the network side through the reestablished radio resource and the E-I interface and receives the data or paging message.

When the mobile terminal in the idle state or the mobile terminal in the dormant state sends data or signaling to the network side, the method further includes:

The mobile terminal sends a radio resource reconstruction request carrying the mobile terminal identity to the ERS of the cell where it is located;

The mobile terminal sends a RAN context request carrying the mobile terminal identity to the ERS of the cell where it is located to the IAGW of the routing area where it is located;

The IAGW in the routing area, the IAGW sends the corresponding RAN context to the ERS of the cell where the mobile terminal is located and establishes the E-I interface of the mobile terminal;

The ERS of the cell where the mobile terminal is located re-establishes radio resources according to the RAN context and returns a re-establishment success response message to the mobile terminal;

The mobile terminal establishes communication with the network side through the reestablished radio resource and the E-I interface and sends the data or signaling.

When the IAGW in the routing area where the mobile terminal is located detects that the mobile terminal remains dormant in the routing area and reaches the set second time threshold, it deletes the RAN context and PDP context of the mobile terminal, and transfers to the packet domain idle state. state (PMM IDLE state).

A method for controlling the context of a mobile terminal, when the control method for the mobile terminal includes the following steps:

B1, when the mobile terminal enters the idle state or the dormant state, save the RAN identity of the edge radio base station (ERS1) of the cell; at the same time, the ERS1 corresponds to save the access network (RAN) context and the mobile terminal identity of the mobile terminal; ERS1 is located in the

B2. The ERS1 releases the E-I interface with the IAGW1 and the wireless resources with the wireless terminal when the ERS1 detects that the mobile terminal remains idle or sleeps in the cell and reaches a first time threshold.

Before the arrival of the first time threshold, when the cell where the mobile terminal is located changes, the following steps are also included after the step B1:

B12', the mobile terminal initiates a cell update and saves the RAN identity of the updated ERS;

B13', the ERS before the update sends the RAN context of the mobile terminal to the ERS after the update for continued storage, then deletes the local record and releases the E-I interface and wireless resources;

B14', the updated ERS establishes the E-I interface corresponding to the mobile terminal and establishes radio resources according to the RAN context, and continues to monitor when the first time threshold arrives, releasing the E-I interface and radio resources.

The steps between B12' and B13' further include: the ERS where the update is located requests the RAN context of the mobile terminal from the ERS before the update.

Before the arrival of the first time threshold, when the cell where the mobile terminal is located changes, the following steps are also included after the step B1:

B22', the mobile terminal initiates a cell update;

B22', the ERS after the update notify the ERS before the update to release the E-I interface and wireless resources;

B23', the ERS before the update releases the E-I interface and radio resources after receiving the notification.

When the mobile terminal is in an idle state, the IAGW1 also saves the mobility management (MM) context containing the address information of the routing area where the mobile terminal is located;

When the mobile terminal is in the dormant state, the IAGW1 also saves the MM context of the mobile terminal including the address information of the routing area where the mobile terminal is located and the packet data protocol (PDP) context including the information of the IAGW where the mobile terminal is located .

When the routing area of the mobile terminal changes, the method also includes:

The mobile terminal initiates a routing area update; and the IAGW1 updates the routing area address information in the MM context of the routing area according to the updated routing area of the mobile terminal.

When the IAGW where the mobile terminal is located changes, the method further includes:

When the mobile terminal is in an idle state, the IAGW where the mobile terminal is before the update sends the MM context of the mobile terminal to the IAGW where the mobile terminal is after the update continues to save, and deletes the local record;

When the mobile terminal is in the dormant state, the IAGW where the mobile terminal was before the update sends the MM context and PDP context of the mobile terminal to the IAGW where the mobile terminal is after the update to continue saving and delete the local record ; and the updated IAGW updates the IAGW information of the mobile terminal contained in the PDP context, and notifies the gateway IAGW of the mobile terminal of the update result.

When the network side pages the mobile terminal in the idle state or the dormant state or sends data to the mobile terminal in the idle state or the dormant state, the method further includes:

The network side searches for the IAGW where the mobile terminal is currently located and sends the data or paging message to the IAGW;

The IAGW judges whether the E-I interface of the mobile terminal has been released, if not, sends paging or data through the E-I interface, otherwise rebuilds the E-I interface corresponding to the mobile terminal and according to the route in the MM context of the mobile terminal The area address information sends a paging message carrying the mobile terminal identification to all ERS located in the corresponding routing area;

All ERS in the routing area simultaneously send a paging message carrying the mobile terminal identifier;

When the mobile terminal receives the currently sent paging message, it sends a cell update request to the ERS of the cell where it is currently located;

The ERS of the cell where the mobile terminal is currently located sends an uplink signaling transmission message to the ERS1 that stores the RAN context of the UE, and ERS1 triggers the execution of forward migration and transfers the RAN context of the mobile terminal to the ERS of the cell where the mobile terminal is currently located;

The ERS of the cell currently located establishes radio resources according to the information in the RAN context and returns a reestablishment success response message to the mobile terminal;

The mobile terminal establishes communication with the network side through the reestablished radio resource and the E-I interface and sends the data or signaling.

When the mobile terminal in the idle state or the dormant state sends data or signaling to the network side, the method further includes:

The mobile terminal sends a cell update request to the ERS of the cell where it is currently located;

The ERS1 performs forward update with the ERS of the cell where the mobile terminal is currently located and transfers the RAN context of the mobile terminal to the ERS of the cell where the mobile terminal is currently located;

The ERS of the cell currently located establishes radio resources according to the information in the RAN context and returns a reestablishment success response message to the mobile terminal;

The mobile terminal sends data or signaling through the reestablished radio resource.

When the network side pages the mobile terminal in the idle state or the dormant state or sends data to the mobile terminal in the idle state or the dormant state, the method further includes:

The mobile terminal sends a cell update request carrying the ERS identifier of the cell it is currently in to the ERS1;

The ERS1 performs forward migration with the ERS of the cell where the mobile terminal is currently located and transfers the RAN context of the mobile terminal to the ERS of the cell where the mobile terminal is currently located;

The ERS of the cell currently located rebuilds the E-I interface corresponding to the mobile terminal and establishes radio resources according to the information in the RAN context and returns a re-establishment success response message to the mobile terminal;

The mobile terminal establishes communication with the network side through the reestablished radio resource and the E-I interface and sends the data or signaling.

When the IAGW in the routing area where the mobile terminal is located detects that the mobile terminal remains dormant in the routing area and reaches the set second time threshold, it deletes the RAN context and PDP context of the mobile terminal, and transfers to the packet domain idle state. state (PMM_IDLE state).

The beneficial effects brought by the technical solution of the present invention are:

The present invention starts from the actual needs, considering that the UE in the Dormant or Idle state may have a long silent period, and even no longer initiates services. The existing design leads to transferring the Context according to the needs when the UE is moving, which can support long-term silent The UE maintains its Context, but does not need to waste resources to transfer the Context. At the same time, considering that there is a high probability of activating services for a period of time after the UE turns into a Dormant or when it does not move out of the ERS, the Context can be reserved in the RAN for a period of time to facilitate the UE to turn into the Active state as soon as possible.

Description of drawings

FIG. 1 is a schematic structural diagram of a UMTS system;

Figure 2 is a schematic diagram of the UTRAN network structure;

FIG. 3 is a schematic diagram of a PS domain network structure;

FIG. 4 is an evolution architecture of an existing two-layer node;

Fig. 5 is a flowchart of Embodiment 1;

Fig. 6 is a flowchart of the second embodiment.

Detailed ways

In order to reduce the transfer frequency of the corresponding Context caused by UE movement in the Idle state or Dormant state, the present invention proposes two solutions, so that the UE Context is transferred when the UE needs it, so as to save system resources.

method 1

When the UE changes from the Active state to the Dormant state, the RAN context of the UE is first saved in the corresponding node of the RAN (such as ERS), and the mobile management context (MM Context) packet data protocol context (PDPContext) is saved in the corresponding IAGW, and then transferred as needed. This ensures that the UE can quickly transfer to the Active state for communication when the UE may resume services later. Both the UE and the network are set with the same timer RAN timer1, CN timer2. When the UE enters the Dormant state, the timer timer1 starts counting in the UE and the RAN. When the timer timer1 reaches the set value, the RAN Context is transmitted to the CN (such as IAGW) for storage, and at the same time, the interface and user plane between the RAN and CN are released.

If the UE moves to other ERS ranges before the timer timer1 expires, transfer the RN Context through the following two methods:

1. The UE initiates a cell update, and the RAN Context is transferred to the new ERS (transfer means that the original Context is deleted), and timer1 continues to count; the update process may be more than one time, and each update specifically includes the following steps:

1) The mobile terminal initiates a cell update;

2) The ERS before the update sends the RAN context of the mobile terminal to the ERS after the update to continue saving, then deletes the local record and releases the E-I interface and wireless resources;

3) The updated ERS establishes radio resources according to the RAN context, and when it continues to monitor that the first time threshold is reached, it sends the RAN context and mobile terminal identifier to the IAGW1 to continue saving, and then deletes the local Record and release the E-I interface and radio resources.

Alternatively, the ERS where the update is located may also request the RAN context of the mobile terminal from the ERS before the update.

2. The UE initiates an update process, the new ERS notifies the source ERS, and the source ERS transmits the RAN Context to the CN for storage, releases the E-I connection, similar to timer1 timeout, and timer1 resets at the same time; the update process may be more than one time, and each update includes the following details step:

1) The mobile terminal initiates a cell update;

2) The ERS after the update notifies the ERS before the update to send the RAN context of the mobile terminal to the IAGW1 for storage;

3) After receiving the notification, the ERS before updating sends the RAN context of the sending mobile terminal to the IAGW1 for continued storage, then deletes the local record and releases the E-I interface and wireless resources.

After the RAN Context is transmitted to the CN, the behavior of the UE is similar to the IDLE state. When the UE is moving, when the ERS is replaced, the cell update process will not be triggered. Only when the routing area changes, the routing area update process (Routeing Area Update) will be triggered (also During this process, the CN may download the RAN Context to the current RAN node), and update the routing area address information in the mobility management context (MM Context). When the UE changes the CN node, the RAN Context, MM Context and PDP context and other relevant information are transferred to the new CN node together, and the PDP context is updated (Update PDP Context), the IAGW address information is updated, and the gateway IAGW (Gateway IAGW, similar to GIAGW, service exit point) the address of the new IAGW where the UE is located, so that if there is downlink data, the gateway IAGW can find the IAGW where the UE is located and send paging.

When the UE resumes the service, the CN downloads the RAN Context to the RAN node where the UE is currently located to resume communication. Otherwise, if the UE has been inactive and the timer timer2 expires (timer2 can start timing from UE to Dormant, or timer1 ends, the specific implementation is related), delete the RAN Context in the CN, set the UE state to Idle state, Set all PDP sessions of the UE to expire, and initiate the process of deleting the PDP context (Delete PDP Context).

When the UE is in Dormant and the network side has data for the UE, the CN initiates paging to the RA (RouteingArea) area. At the same time, send the RAN Context to all RAN nodes in the RA (if using multicast technology, the RAN node will delete it if there is no UE response within a certain period of time after receiving it, so as to ensure resources); or wait for the UE to respond before sending the RAN Context To the corresponding RAN node (similar to the service initiated by the UE below).

When the UE in the Dormant state wants to continue to initiate services, the UE notifies the network that it is in the Dormant state and its identity through the uplink public channel (such as RACH), and the RAN node (such as ERS) uses the identity to request the RAN Context corresponding to the UE from the CN. The CN sends the RAN Context to the RAN node and establishes an E-I link. The RAN node uses the RAN Context to rebuild the radio interface protocol stack and communicate with the UE normally. (The process of UE initiating a service is similar to Flowchart 4, except for the paging issued by the network)

When the UE communicates with the network normally, the UE enters the Active state, and timer1 and timer2 are reset.

Through this method, the RAN acquires the RAN Context only when the service is re-established when the UE is in the Dormant state. Otherwise, the UE's activity is similar to the IDLE state (after the RAN Context is transferred to the CN). When the UE has just entered the Dormant state or has not moved out of the range of the ERS, the probability of the UE re-initiating the service is relatively high. Keeping the RAN Context in the RAN is convenient for quickly initiating the service.

The settings of timer1 and timer2 above are related to the specific implementation. For example, when timer1 is infinite and moves out of ERS, it is the above method 2, that is, UE will not transfer RAN Context to CN if it does not move out of ERS range. The timer1 is infinite and the ERS is moved out of the above method 1, which is similar to the existing implementation, that is, when the UE moves to a new ERS, the RAN Context is transferred.

When the network side pages the mobile terminal in the idle state or dormancy state or sends data to the mobile terminal in the idle state or dormancy state, the network side searches for the IAGW where the mobile terminal is currently located and sends the data or paging message to The IAGW; the IAGW judges whether the E-I interface corresponding to the mobile terminal has been released, if not, sends a paging message or data through the E-I interface; if so, rebuilds the E-I interface corresponding to the mobile terminal and according to the MM The address information of the routing area in the context sends a paging message carrying the mobile terminal identifier to all ERS located in the corresponding routing area, and sends the saved RAN context to all ERS to which it belongs; the routing area All ERS in the cell simultaneously send a paging message carrying the mobile terminal identifier; when the mobile terminal receives the paging message sent by the ERS in the cell it is in, it sends a radio resource re-establishment request to the ERS in the cell it is in; When the ERS receives the re-establishment request, it re-establishes the radio resources of the mobile terminal according to the information in the RAN context and returns a re-establishment success response message to the mobile terminal, and other ERS in the routing area discard the The RAN context: the IAGW sends a paging message or data through the re-established E-I interface, and the mobile terminal receives the paging message or data through the re-established radio resource.

Or, when the network side pages the mobile terminal in the idle state or dormant state or sends data to the mobile terminal in the idle state or dormant state, the network side searches for the IAGW where the mobile terminal is currently located and sends the data or paging message Send to the IAGW; whether the E-I interface corresponding to the mobile terminal of the IAGW has been released, if not, send paging or data through the E-I interface; if so, rebuild the E-I interface corresponding to the mobile terminal and The address information of the routing area in the MM context sends a paging message carrying the mobile terminal identifier to all ERS located in the routing area; all ERS in the routing area simultaneously send the paging message carrying the mobile terminal identifier ; When the mobile terminal receives the paging message sent by the ERS of the cell where it is located, it sends a radio resource re-establishment request to the ERS of the cell where it is located; when the ERS of the cell where the mobile terminal is located receives the re-establishment request, it sends The IAGW requests the RAN context of the mobile terminal; the IAGW sends the corresponding RAN context to the ERS of the cell where the mobile terminal is located; the ERS of the cell where the mobile terminal is located rebuilds radio resources according to the RAN context and returns the reconstruction to the mobile terminal A successful response message; the mobile terminal establishes communication with the network side through the reestablished radio resource and E-I interface and receives the data or paging message.

When the mobile terminal in the idle state or the mobile terminal in the dormant state sends data or signaling to the network side, the mobile terminal sends a radio resource reconstruction request carrying the mobile terminal identifier to the ERS of the cell where it is located; The ERS sends a RAN context request carrying the identification of the mobile terminal to the IAGW in the routing area; the IAGW in the routing area sends the corresponding RAN context to the ERS in the cell where the mobile terminal is located and establishes the E-I interface of the mobile terminal; The ERS of the cell where the mobile terminal is located re-establishes radio resources according to the RAN context and returns a re-establishment success response message to the mobile terminal; the mobile terminal establishes communication with the network side through the re-established radio resources and the E-I interface and sends the data or information make.

Describe in detail with embodiment one below:

As shown in Figure 5, under method 1 (the Context is stored in the CN), when the network has data to the UE, the specific process is as follows:

S101. When data arrives from the network, find out the IAGW where the UE is currently located by searching the HLR, and then send the data or paging message to the current IAGW of the UE, and the IAGW sends paging to all ERS in the RA where the UE is located;

S102. After receiving the paging from the CN, the ERS continues to deliver the paging message;

S103. After receiving the paging, the UE understands that the network side saves its own RAN Context, and then sends an RRC reconstruction request, and the message carries an identifier similar to U-RNTI;

S104. After receiving it, the ERS sends a RAN Context request message to request the IAGW to send the RAN Context of the UE to the node;

S105. The IAGW uses the identifier to find the corresponding RAN Context, and sends the Context to the ERS through the RAN Context response message;

The ERS sends an RRC reestablishment response to the UE, indicating that the RAN Context in the RAN has been successfully established, and then the UE sends a direct message paging response to notify the CN of receiving the paging. Then communicate normally. The following process is omitted.

When the mobile terminal in the idle state or the mobile terminal in the dormant state sends data or signaling to the network side, the mobile terminal sends a radio resource reconstruction request carrying the mobile terminal identifier to the ERS of the cell where it is located; The ERS sends an RNA context request carrying the identification of the mobile terminal to the IAGW in the routing area; the IAGW in the routing area said IAGW sends the corresponding RAN context to the ERS in the cell where the mobile terminal is located; the ERS in the cell where the mobile terminal is located according to The RAN context re-establishes radio resources and returns a re-establishment success response message to the mobile terminal; the mobile terminal establishes communication with the network side through the re-established radio resources and sends the data or signaling.

Method 2

When the UE turns into the Dormant state, other methods are similar to method 1, but the context of the UE is always stored in the RAN node when the UE turns into the Dormant state instead of being uploaded to the CN, and the UE records the assigned RAN identifier (such as U-RNTI, which includes RAN node ID). A timer can be set to release the E-I interface after a certain time to avoid wasting resources.

If the UE moves to other ERS ranges before the timer timer1 expires, there are two processing methods as follows:

1. The UE initiates a cell update, and the RAN Context is transferred to the new ERS (transfer means that the original Context is deleted), and timer1 continues to count; the update process may be more than one time, and each update specifically includes the following steps:

1) The mobile terminal initiates a cell update and saves the RAN identity of the updated ERS;

2) The ERS before the update sends the RAN context of the mobile terminal to the ERS after the update to continue saving, then deletes the local record and releases the E-I interface and wireless resources;

3) The updated ERS establishes radio resources according to the RAN context, and releases the E-I interface and radio resources when it continues to monitor that the first time threshold is reached.

2. The mobile terminal initiates a cell update; the ERS where the update is located notifies the ERS before the update to directly release the E-I interface and radio resources.

When the UE moves out of the range of the RAN node, it is similar to the Idle state, and only when the routing area changes, the routing area update process (Routeing Area Update) is triggered. When UE changes CN node, other relevant information such as mobility management context (MM Context) and PDP context are transferred to the new CN node, and PDP context update (Update PDP Context) is performed to notify gateway IAGW (GatewayIAGW, similar to GIAGW, business exit point) the address of the new IAGW where the UE is located, so that if there is downlink data, the gateway IAGW can find the IAGW where the UE is located and send paging.

When the UE in the Dormant state wants to initiate a service, it initiates a cell update process (CellUpdat) and triggers forward migration. The previous RAN node transfers the RAN Context to the new RAN node, and then performs normal communication.

When data from the network arrives at the UE, the CN pages in the routing area (RA), and the UE initiates a cell update process (Cell Updat) after receiving it, triggering forward migration, the previous RAN node transfers the RAN Context to the new RAN node, and then for normal communication.

Set the timer timer3, and release the Context in the RAN node when the UE does not activate the service within a period of time when it turns into a Dormant.

This method transfers the RAN Context to the CN. The UE in the Dormant state initiates a service or receives a page. The process is different from that of the UE in the Idle state. Initiate the RRC Connection Setup process to rebuild the context, and the RAN uses this identifier to request the RAN Context from the CN to rebuild the context and communication protocol stack to communicate quickly, including:

When the network side pages the mobile terminal in the idle state or dormancy state or sends data to the mobile terminal in the idle state or dormancy state, the network side searches for the IAGW where the mobile terminal is currently located and sends the data or paging message to The IAGW; the IAGW judges whether the E-I interface of the mobile terminal has been released, if not, sends paging or data through the E-I interface, otherwise rebuilds the E-I interface corresponding to the mobile terminal and according to the MM context of the mobile terminal The address information of the routing area sends a paging message carrying the mobile terminal identifier to all ERS located in the corresponding routing area; all ERS in the routing area simultaneously send a paging message carrying the mobile terminal identifier; the mobile When the terminal receives the currently sent paging message, it sends a cell update request to the ERS of the cell where the mobile terminal is currently located; the ERS of the cell where the mobile terminal is currently located sends an uplink signaling transmission message to the ERS1 and ERS1 that store the RAN context of the UE Trigger the execution of forward migration and transfer the RAN context of the mobile terminal to the ERS of the cell where it is currently located; the ERS of the cell where it is currently located establishes radio resources according to the information in the RAN context and returns a successful re-establishment response message to the mobile terminal; The mobile terminal establishes communication with the network side through the reestablished radio resource and the E-I interface and sends the data or signaling.

When the mobile terminal in the idle state or dormant state sends data or signaling to the network side, the mobile terminal sends a cell update request to the ERS of the cell where the mobile terminal is currently located; the ERS1 performs forward communication with the ERS of the cell where the mobile terminal is currently located. Update and transfer the RAN context of the mobile terminal to the ERS of the cell where it is currently located; the ERS of the cell where it is currently located establishes radio resources according to the information in the RAN context and returns a successful re-establishment response message to the mobile terminal; the mobile terminal Send data or signaling over the reestablished radio resource.

When the network side pages the mobile terminal in the idle state or the dormant state or sends data to the mobile terminal in the idle state or the dormant state, the mobile terminal sends to the ERS1 a cell update request that the cell carries the ERS identifier of the cell in which it is currently located; The ERS1 of the cell where the mobile terminal is currently located performs forward migration and transfers the RAN context of the mobile terminal to the ERS of the cell where the mobile terminal is currently located; the ERS of the cell where the mobile terminal is currently located rebuilds the E-I interface corresponding to the mobile terminal and according to the The information in the RAN context establishes radio resources and returns a reestablishment success response message to the mobile terminal; the mobile terminal establishes communication with the network side through the reestablished radio resources and the E-I interface and sends the data or signaling.

Describe in detail with embodiment two below:

As shown in Figure 6, ERS1 is the ERS where the UE is currently located, and ERS2 is the ERS that saves the RAN Context of the UE. The call process when the RAN node saves the RAN Context is as follows:

S201. When the network arrives with data or a paging message, the IAGW sends paging to all ERS in the RA;

S202. After receiving the paging message, the ERS under the UE's current RA continues to deliver the paging message;

S203. The UE sends a cell update message after receiving the paging;

S204, ERS1 receives the UE's cell update message, and sends an uplink signaling transmission message to ERS2 through the U-RNTI identifier;

S205. ERS2 receives the message, performs a migration process, and sends a RELOCATION REQUIRED message to the CN.

Afterwards, the normal migration process is carried out. After the migration process is completed, the RAN Context of the UE is transferred to ERS1, and the CN receives the paging through the direct transmission message, and the normal communication process is carried out.

In this method, the RAN Context of the UE is retained at the RAN node when the UE is transformed into a Dormant. When communication is required, the UE initiates the Cell Update process, triggers the forward migration process, and transfers the RANContext to the current RAN node for communication. The method utilizes the prior art and is convenient to realize. The service initiated by the UE in the Dormant state can include signaling processes such as RA Update, so that the Context can be transferred in time during the signaling process, shortening the signaling process establishment communication time. If this process is not included, it is better to have a mechanism to notify the RAN to delete the relevant RAN Context after the UE is deactivated.

In the above two methods, if the service initiated by the UE in the Dormant state includes any UE’s uplink behavior, such as RA Update or Detach and other signaling processes, the RAN Context of the UE is first transferred to the RAN, and then the RAN Context is used to establish communication, and the UE performs The signaling process such as RA Update can shorten the process time. The signaling process is considered to be in the Active state, timer1 is reset, but timer2 is suspended, when the signaling process ends, the UE re-enters the Dormant state, timer2 continues to count, and timer1 restarts. When timer1 times out or the UE enters other ERS (refer to method 1 related procedures), the RAN Context is transferred to the CN (method 1) or remains on the RAN node (method 2), and the UE records a new U-RNTI.

If the service initiated by the UE in the Dormant state does not include signaling processes such as RA Update, but only involves user plane service processes, then when the UE initiates a detach process or the CN performs an implicit separation, it is best for the CN to notify the RAN node to delete the RAN Context of the UE . (If not notified, it can be deleted by timer3 expiration)

Using the above method, there are only two concepts of location areas in the evolved network, namely Cell and RA. Cell is the concept of location area of RAN. In the Active state and when the UE has not moved out of the ERS or Timer1 has not expired, the UE can be in the Cell. Da. RA is the concept of CN's location area. In Idle or other Dormant states, UE is reachable in RA. The location area is simplified, and the repetition and complexity of the location area are avoided.

The present invention also supports the LTE IDLE state, that is, the idea provided by the present invention can be used in the LTE IDLE state, and the network retains the UE's Context when the UE attaches. When the UE moves, similar to the Idle state in the existing UMTS, the UE only performs operations such as routing area update and periodic location registration. Context transfer is performed when the UE continues to communicate (such as Routeing Area Update or initiating data services), so that the UE establishes communication with less delay.

The present invention is also not limited to the two-layer nodes of IAGW and ERS. The division of three-layer nodes or ERS into user plane entities, control plane entities, etc. is slightly different from the flow of the above embodiment, but the essential idea is still under the idea of the present invention.

As shown in Figure 4, using the above method, there are only two location area concepts in the evolved network, namely the cell Cell and the routing area RA. Cell is the location area concept of the RAN. When the time expires, the UE is reachable in the Cell. RA is the concept of CN's location area. In Idle or other Dormant states, UE is reachable in RA.

The above descriptions are only process and method embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (22)

1. A control method for a mobile terminal context, comprising the steps of: A1, the edge wireless base station (ERS1) where the mobile terminal is located, saves the radio access network (RAN) context and the mobile terminal identifier of the mobile terminal when the mobile terminal enters the idle state or dormant state, and monitors the state of the mobile terminal; A2. When the ERS1 monitors that the mobile terminal remains idle or sleeps in the cell and reaches the first time threshold, it sends the RAN context and the mobile terminal identifier to the IP access gateway where the ERS1 is located ( IAGW1) continues to save, and then deletes the local record and releases the E-I interface with the IAGW1 and the wireless resource with the wireless terminal. 2. The method according to claim 1, wherein when the cell where the mobile terminal is located changes before the first time threshold is reached, the step A1 further includes the following steps: A12', the mobile terminal initiates a cell update; A13', the ERS before the update sends the RAN context of the mobile terminal to the ERS after the update for further storage, then deletes the local record and releases the E-I interface and wireless resources; A14', the updated ERS establishes wireless resources according to the RAN context, and when the first time threshold is detected, the ERS sends the RAN context and mobile terminal identifier to the IAGW1 for further storage, and then deletes Record and release E-I interface and wireless resources locally. 3. The method according to claim 2, characterized in that, between the steps A2' and A3', further comprising: the ERS where the update is located requests the RAN context of the mobile terminal from the ERS before the update. 4. The method according to claim 1, characterized in that, when the cell where the mobile terminal is located changes before the first time threshold is reached, the step A1 further includes the following steps: A22', the mobile terminal initiates a cell update; A22', the ERS after the update notifies the ERS before the update to send the RAN context of the mobile terminal to the IAGW1 for storage; A23', after the ERS before the update receives the notification, it sends the RAN context of the mobile terminal to the IAGW1 for continued storage, then deletes the local record and releases the E-I interface and wireless resources. 5. The method according to any one of claims 1-4, characterized in that, The IAGW1 also saves the mobility management (MM) context containing the address information of the routing area where the mobile terminal is located; When the mobile terminal is in the dormant state, the IAGW1 also saves the MM context of the mobile terminal including the address information of the routing area where the mobile terminal is located and the packet data protocol (PDP) context including the information of the IAGW where the mobile terminal is located . 6. The method according to claim 5, wherein when the routing area of the mobile terminal changes, the method further comprises: the mobile terminal initiates a routing area update; The routing area of the routing area updates the routing area address information in the MM context of the routing area. 7. The method according to claim 6, wherein when the IAGW where the mobile terminal is located changes, the method further comprises: When the mobile terminal is in an idle state, the IAGW where the mobile terminal was before the update sends the RAN context and MM context of the mobile terminal to the IAGW where the mobile terminal is after the update to continue saving and delete the local record ; When the mobile terminal is in the dormant state, the IAGW where the mobile terminal is located before the update sends the RAN context, MM context, and PDP context of the mobile terminal to the IAGW where the mobile terminal is located after the update to continue saving, and delete the local record; and the updated IAGW updates the IAGW information of the mobile terminal contained in the PDP context, and notifies the gateway IAGW of the mobile terminal of the update result. 8. The method according to any one of claims 1, 2, 3, 4 or 6, wherein when the network side pages the mobile terminal in the idle state or dormant state or moves to the idle state or dormant state When the terminal sends data, the method also includes: The network side searches for the IAGW where the mobile terminal is currently located and sends the data or paging message to the IAGW; The IAGW judges whether the E-I interface corresponding to the mobile terminal has been released, if not, sends a paging message or data through the E-I interface; if so, rebuilds the E-I interface corresponding to the mobile terminal and according to the MM context of the mobile terminal The address information of the routing area in the routing area sends a paging message carrying the mobile terminal identifier to all ERS located in the corresponding routing area, and sends the saved RAN context to all ERS to which it belongs; All ERS in the routing area simultaneously send a paging message carrying the mobile terminal identifier; When the mobile terminal receives the paging message sent by the ERS of the cell where it is located, it sends a radio resource re-establishment request to the ERS of the cell where it is located; When the ERS in the cell receives the re-establishment request, it re-establishes the radio resources of the mobile terminal according to the information in the RAN context and returns a re-establishment success response message to the mobile terminal. discarding said RAN context upon arrival; The IAGW sends a paging message or data through the re-established E-I interface, and the mobile terminal receives the paging message or data through the re-established radio resource. 9. The method according to any one of claims 1, 2, 3, 4 or 6, wherein when the network side pages the mobile terminal in the idle state or dormant state or moves to the idle state or dormant state When the terminal sends data, the method also includes: The network side searches for the IAGW where the mobile terminal is currently located and sends the data or paging message to the IAGW; Whether the E-I interface corresponding to the mobile terminal of the IAGW has been released, if otherwise, paging or data is issued through the E-I interface; The address information of the routing area sends a paging message carrying the identification of the mobile terminal to all ERS located in the routing area; All ERS in the routing area simultaneously send the paging message carrying the mobile terminal identifier; When the mobile terminal receives the paging message sent by the ERS of the cell where it is located, it sends a radio resource re-establishment request to the ERS of the cell where it is located; When the ERS of the cell where the mobile terminal is located receives the re-establishment request, it requests the RAN context of the mobile terminal from the IAGW; The IAGW sends the corresponding RAN context to the ERS of the cell where the mobile terminal is located; The ERS of the cell where the mobile terminal is located re-establishes radio resources according to the RAN context and returns a re-establishment success response message to the mobile terminal; The mobile terminal establishes communication with the network side through the reestablished radio resource and the E-I interface and receives the data or paging message. 10. The method according to any one of claims 1, 2, 3, 4 or 6, when the idle state mobile terminal or the dormant state mobile terminal sends data or signaling to the network side, the method further include: The mobile terminal sends a radio resource reconstruction request carrying the mobile terminal identity to the ERS of the cell where it is located; The mobile terminal sends a RAN context request carrying the mobile terminal identity to the ERS of the cell where it is located to the IAGW of the routing area where it is located; The IAGW in the routing area, the IAGW sends the corresponding RAN context to the ERS of the cell where the mobile terminal is located and establishes the E-I interface of the mobile terminal; The ERS of the cell where the mobile terminal is located re-establishes radio resources according to the RAN context and returns a re-establishment success response message to the mobile terminal; The mobile terminal establishes communication with the network side through the reestablished radio resource and the E-I interface and sends the data or signaling. 11. The method according to any one of claims 1, 2, 3, 4 or 6, wherein the IAGW of the routing area where the mobile terminal is located detects that the mobile terminal remains dormant in the routing area up to the set first When the time threshold is reached, delete the RAN context and PDP context of the mobile terminal, and transfer to the packet domain idle state (PMM_IDLE state). 12. A method for controlling the context of a mobile terminal, when the control method for the mobile terminal includes the following steps: B1, when the mobile terminal enters the idle state or the dormant state, save the RAN identity of the edge radio base station (ERS1) of the cell; at the same time, the ERS1 corresponds to save the access network (RAN) context and the mobile terminal identity of the mobile terminal; ERS1 is located in the B2. The ERS1 releases the E-I interface with the IAGW1 and the wireless resources with the wireless terminal when the ERS1 detects that the mobile terminal remains idle or sleeps in the cell and reaches a first time threshold. 13. The method according to claim 12, characterized in that, when the cell where the mobile terminal is located changes before the first time threshold is reached, after the step B1, the following steps are further included: B12', the mobile terminal initiates a cell update and saves the RAN identity of the updated ERS; B13', the ERS before the update sends the RAN context of the mobile terminal to the ERS after the update for continued storage, then deletes the local record and releases the E-I interface and wireless resources; B14', the updated ERS establishes the E-I interface corresponding to the mobile terminal and establishes radio resources according to the RAN context, and continues to monitor when the first time threshold arrives, releasing the E-I interface and radio resources. 14. The method according to claim 13, characterized in that, between the steps B12' and B13', it further comprises: the ERS where the update is located requests the ERS before the update for the RAN context of the mobile terminal . 15. The method according to claim 12, characterized in that, before the first time threshold is reached, when the cell where the mobile terminal is located changes, after the step B1, the following steps are further included: B22', the mobile terminal initiates a cell update; B22', the ERS after the update notify the ERS before the update to release the E-I interface and wireless resources; B23', the ERS before the update releases the E-I interface and radio resources after receiving the notification. 16. The method according to any one of claims 12-15, characterized in that, When the mobile terminal is in an idle state, the IAGW1 also saves the mobility management (MM) context containing the address information of the routing area where the mobile terminal is located; When the mobile terminal is in the dormant state, the IAGW1 also saves the MM context of the mobile terminal including the address information of the routing area where the mobile terminal is located and the packet data protocol (PDP) context including the information of the IAGW where the mobile terminal is located . 17. The method according to claim 16, wherein when the routing area of the mobile terminal changes, the method further comprises: The mobile terminal initiates a routing area update; and the IAGW1 updates the routing area address information in the MM context of the routing area according to the updated routing area of the mobile terminal. 18. The method according to claim 17, wherein when the IAGW where the mobile terminal is located changes, the method further comprises: When the mobile terminal is in an idle state, the IAGW where the mobile terminal is before the update sends the MM context of the mobile terminal to the IAGW where the mobile terminal is after the update continues to save, and deletes the local record; When the mobile terminal is in the dormant state, the IAGW where the mobile terminal was before the update sends the MM context and PDP context of the mobile terminal to the IAGW where the mobile terminal is after the update to continue saving and delete the local record ; and the updated IAGW updates the IAGW information of the mobile terminal contained in the PDP context, and notifies the gateway IAGW of the mobile terminal of the update result. 19. The method according to claim 12, 13, 14, 17 or 18, wherein when the network side pages the mobile terminal in the idle state or dormant state or sends data to the mobile terminal in the idle state or dormant state When, the method also includes: The network side searches for the IAGW where the mobile terminal is currently located and sends the data or paging message to the IAGW; The IAGW judges whether the E-I interface of the mobile terminal has been released, if not, sends paging or data through the E-I interface, otherwise rebuilds the E-I interface corresponding to the mobile terminal and according to the route in the MM context of the mobile terminal The area address information sends a paging message carrying the mobile terminal identification to all ERS located in the corresponding routing area; All ERS in the routing area simultaneously send a paging message carrying the mobile terminal identifier; When the mobile terminal receives the currently sent paging message, it sends a cell update request to the ERS of the cell where it is currently located; The ERS of the cell where the mobile terminal is currently located sends an uplink signaling transmission message to the ERS1 that stores the RAN context of the UE, and ERS1 triggers the execution of forward migration and transfers the RAN context of the mobile terminal to the ERS of the cell where the mobile terminal is currently located; The ERS of the cell currently located establishes radio resources according to the information in the RAN context and returns a reestablishment success response message to the mobile terminal; The mobile terminal establishes communication with the network side through the reestablished radio resource and the E-I interface and sends the data or signaling. 20. The method according to claim 12, 13, 14, 17 or 18, when the idle state or dormant state mobile terminal sends data or signaling to the network side, the method further comprises: The mobile terminal sends a cell update request to the ERS of the cell where it is currently located; The ERS1 performs forward update with the ERS of the cell where the mobile terminal is currently located and transfers the RAN context of the mobile terminal to the ERS of the cell where the mobile terminal is currently located; The ERS of the cell currently located establishes radio resources according to the information in the RAN context and returns a reestablishment success response message to the mobile terminal; The mobile terminal sends data or signaling through the reestablished radio resource. 21. The method according to claim 12, 13, 14, 17 or 18, when the network side pages the idle state or dormant state mobile terminal or sends data to the idle state or dormant state mobile terminal, the Methods also include: The mobile terminal sends a cell update request carrying the ERS identifier of the cell it is currently in to the ERS1; The ERS1 performs forward migration with the ERS of the cell where the mobile terminal is currently located and transfers the RAN context of the mobile terminal to the ERS of the cell where the mobile terminal is currently located; The ERS of the cell currently located rebuilds the E-I interface corresponding to the mobile terminal and establishes radio resources according to the information in the RAN context and returns a re-establishment success response message to the mobile terminal; The mobile terminal establishes communication with the network side through the reestablished radio resource and the E-I interface and sends the data or signaling. 22. The method according to claim 12, 13, 14, 17 or 18, wherein the IAGW of the routing area where the mobile terminal is located detects that the mobile terminal remains dormant in the routing area for a set second time threshold , delete the RAN context and PDP context of the mobile terminal, and transfer to the packet domain idle state (PMM_IDLE state).

Images