WO2016078464A1

WO2016078464A1 - Method for updating ssd upon fall-back from lte network to cs domain, and communication system

Info

Publication number: WO2016078464A1
Application number: PCT/CN2015/088180
Authority: WO
Inventors: 周燕; 张志华
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-11-18
Filing date: 2015-08-26
Publication date: 2016-05-26
Also published as: CN105592510A

Abstract

Disclosed are a method for updating SSD upon fall-back from a long term evolution (LTE) network to a circuit switch (CS) domain, and a communication system, the method comprising: when detecting that a user equipment (UE) initiates a voice call service for a CS domain in an LTE network, an interworking solution (IWS) first updates shared secret data (SSD) of the UE within a preset time; after upgrading the SSD of the UE, the IWS initiates a switching process for a media switch center (MSC) to switch the UE to a target base station of the CS domain. The solution of the present invention can first complete the SSD update of the UE, and then complete the switching process of the calling process after the UE falls back to the CS domain (i.e., CDMA 2000 network), thus avoiding the conflict resulting from the simultaneous SSD upgrade process and switching process when the UE falls back from the LTE network to the CS domain.

Description

SSD update method and communication system when falling back from LTE network to CS domain

Technical field

The present invention relates to the field of communications, and in particular, to an SSD (Shared Secret Data) update method and a communication system when an LTE (Long Term Evolution) network is dropped back to a CS (Circuit Switch) domain.

Background technique

LTE (Long Term Evolution) is a long-term evolution of the UMTS (Universal Mobile Telecommunications System) technology standard developed by the 3GPP (The 3rd Generation Partnership Project). The LTE network falls back to the CDMA2000 network architecture diagram, as shown in Figure 1, which includes the following network elements:

E-RAN (Evolved RAN): Evolved Radio Access Network, which can provide higher uplink and downlink rates, lower transmission delay and more reliable wireless transmission. The network element included in the E-RAN is an eNodeB (Evolved NodeB), which provides radio resources for access of the UE (User Equipment);

MME (Mobility Management Entity: a mobile management entity, a control plane function entity, a server that temporarily stores user data, is responsible for managing and storing UE contexts (such as UE user ID, mobility management status, user security parameters, etc.), and assigns temporary to users. Identification, when the UE is camped on the tracking area or the network is responsible for authenticating the user; processing all non-access stratum messages between the MME and the UE; triggering paging at the SAE.

Serving GW (Gateway): A service gateway. The gateway is a user plane entity responsible for user plane data routing processing and terminating downlink data of UEs in idle state. Manage and store the SAE bearer context of the UE, such as IP bearer service parameters and network internal routing information. It is the anchor point of the internal user plane of the 3GPP system. A user can only have one Serving GW at a time;

IWS (Interworking Solution): Interoperability node. When the UE under the coverage of LTE cannot process the voice service, it can first fall back to the circuit domain network and process the voice service in the circuit domain network. The IWS is responsible for implementing the interaction between the MME under LTE and the MSC in the circuit domain.

CDMA2000 1X access network: mainly includes MS mobile terminal and BTS base transceiver station. The base transceiver station is responsible for wireless signal transmission and reception, and realizes communication between the wireless network system and the mobile station.

BSC (Base Station Controller): Base station controller, responsible for BTS control and management, resource allocation, wireless connection establishment, mobility management, power control, etc.

MSC (Media Switch Center): Mobile switching center, responsible for call setup, routing, call control, radio resource allocation, mobility management, location level, channel switching in the switching area, etc.

The CDMA2000 1X authenticates the accessed UE by updating the shared encrypted data SSD. In the CDMA2000 network, the traditional user will perform authentication after the voice call is initiated. If the authentication fails, the MSC will trigger the SSD update to the user and try to authenticate again.

In the LTE network, the UE decides to initiate a voice call. In the early stage of LTE network construction, the corresponding IMS (IP Multimedia Subsystem) has not been established yet, or other resources are considered to cause the voice to be unavailable through the LTE network. business. At this time, in the EPS (Evolved Packet System), the CSFB (Circuit Switched Fallback) function can be utilized, and the UE completes the voice service by dropping back to the circuit domain through the IWS network element. After the UE completes the call connection with the MSC domain under the LTE network, the IWS network element triggers a handover request to the MSC. However, after the UE completes the fallback to the CDMA2000 network, the SSD update during the voice call cannot be completed, and the authentication fails. The reason is that after the UE completes the call connection in the LTE network, the IWS immediately triggers the handover request to the MSC, and the MSC performs the handover. If the SSD update process of the UE is also initiated at the same time, the process conflict may be caused, and the SSD update of the UE cannot be completed.

Summary of the invention

The embodiment of the present invention provides an SSD update method and a communication system when the LTE network is dropped back to the CS domain, so as to at least solve the conflict that the existing UE performs the SSD update process and the handover process when the UE is dropped from the LTE network to the CS domain. The problem.

In order to solve at least the above technical problem, the embodiment of the present invention provides a method for updating a shared encrypted data when the network is dropped from the long term evolution network to the circuit switched domain, including:

The interoperation node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, and performs interaction update processing on the shared encrypted data of the user equipment by interacting with the mobile switching center within a preset time;

After performing the update processing on the shared encrypted data of the user equipment, the interoperation node initiates a handover procedure to the mobile switching center to switch the user equipment to the target base station of the circuit switched domain.

In an embodiment of the present invention, the interoperation node determines whether the user equipment initiates a voice call service of a circuit switched domain in a long term evolution network by determining whether a voice start message sent by the user equipment is received.

In an embodiment of the present invention, the interaction between the interworking node and the mobile switching center in the preset time to complete the update processing of the shared encrypted data of the user equipment includes:

When the interoperation node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, the user equipment starts timing, and determines, in the preset time, whether the new authentication data sent by the mobile switching center is received. The shared encrypted data update request, if received, is forwarded to the user equipment for shared encrypted data update; otherwise, it is determined that the shared encrypted data update is not required for the user equipment.

In an embodiment of the invention, the preset time is 2 seconds.

In order to solve at least the above problem, the embodiment of the present invention further provides a method for updating a shared encrypted data when the network is dropped from the long term evolution network to the circuit switched domain, including:

When the interworking node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, the mobile switching center performs the update processing on the shared encrypted data of the user equipment by interacting with the interoperation node within a preset time. ;

After the mobile switching center performs an update process on the shared encrypted data of the user equipment by performing interaction with the interworking node, receiving a handover procedure initiated by the interoperation node to switch the user equipment to a target of a circuit switched domain. On the base station.

In an embodiment of the present invention, the mobile switching center performs an update process on the shared encrypted data of the user equipment by performing interaction with the interoperation node within a preset time, including: the mobile switching center is in the Transmitting a shared encrypted data update request including new authentication data to the interoperation node, and calculating, by using a preset algorithm, the first verification data;

Receiving, by the mobile switching center, second verification data that is fed back by the interoperation node, where the second verification data is used by the user equipment according to the new authentication data in the shared encrypted data update request forwarded by the interoperation node. The preset algorithm performs calculation to obtain second verification data;

The mobile switching center performs the comparison verification on the first verification data and the second verification data, and the verification result is fed back to the user equipment by the interoperation node;

Receiving, by the mobile switching center, an update result fed back by the interoperation node, where the update result is that the user equipment locally updates the first when the verification result is that the first verification data and the second verification data are the same The result of the update sent to the interoperation node after verifying the data.

After performing the update processing on the shared encrypted data of the user equipment, the interoperation node initiates a handover procedure to the mobile switching center;

The mobile switching center receives the handover procedure initiated by the interworking node to switch the user equipment to a target base station of the circuit switched domain.

In order to solve at least the above problem, an embodiment of the present invention further provides an interoperation node, including a first update processing module and a first handover processing module;

The first update processing module is configured to detect that the user equipment performs the update processing on the shared encrypted data of the user equipment by interacting with the mobile switching center within a preset time when the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network. ;

The first switching processing module is configured to, after the first update processing module performs update processing on the shared encrypted data of the user equipment, initiate a handover procedure to the mobile switching center to switch the user equipment to a target of the circuit switched domain. On the base station.

In order to solve at least the above problem, the embodiment of the present invention further provides a mobile switching center, including a second update processing module and a second switching processing module;

The second update processing module is configured to, when the interoperation node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, interact with the interoperation node to complete the user equipment in a preset time. Sharing encrypted data for update processing;

The second handover processing module is configured to: after the second update processing module interacts with the interoperation node to complete update processing on the shared encrypted data of the user equipment, receive a handover procedure initiated by the interoperation node The user equipment switches to a target base station of the circuit switched domain.

In order to solve the above problems at least, the embodiment of the present invention further provides a communication system, including: an interoperation node, a mobile switching center, and a target base station;

The interoperation node is configured to perform an update process on the shared encrypted data of the user equipment by interacting with the mobile switching center within a preset time when detecting that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network; And setting, after performing update processing on the shared encrypted data of the user equipment, initiating a handover procedure to the mobile switching center to switch the user equipment to a target base station of a circuit switched domain;

The mobile switching center is configured to receive a handover procedure initiated by the interworking node to switch the user equipment to a target base station of a circuit switched domain.

The beneficial effects of the embodiments of the present invention are:

The SSD update method and the communication system when the LTE network is dropped from the LTE network to the CS domain provided by the embodiment of the present invention, the interoperation node detects that the user equipment initiates the voice call service of the circuit switched domain in the long-term evolution network, first in a preset time The shared encrypted data of the user equipment is updated. After the interworking node performs the update processing on the shared encrypted data of the user equipment, the interworking node initiates a handover procedure to the mobile switching center to switch the user equipment to the target base station of the circuit switched domain. The solution provided by the embodiment of the present invention can complete the SSD update of the user equipment and complete the handover process of the call process after the user equipment falls back to the CS domain (ie, the CDMA2000 network). The problem of conflicts caused by the SSD update process and the handover process when the UE falls back from the LTE network to the CS domain is avoided.

DRAWINGS

FIG. 1 is a schematic structural diagram of an LTE network falling back to a CDMA2000 network;

2 is a schematic flowchart of an SSD update method when an LTE network is dropped back to a CS domain according to Embodiment 1 of the present invention;

3 is a schematic flowchart of an SSD update method when an LTE network is dropped back to a CDMA2000 network according to Embodiment 1 of the present invention;

4 is a schematic structural diagram of an IWS according to Embodiment 1 of the present invention;

FIG. 5 is a schematic structural diagram of an MSC according to Embodiment 1 of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment 1:

Referring to FIG. 2, the method for updating an SSD of a UE when the LTE network is dropped from the LTE network to the CS domain, includes:

Step 201: The IWS detects that the UE initiates a voice call service of the CS domain in the LTE network, and performs an update process on the SSD of the UE by performing interaction with the MSC within a preset time.

Step 202: After updating the SSD of the UE, the IWS initiates a handover procedure to the MSC to switch the UE to the target base station of the CS domain.

Specifically, as shown in FIG. 4, the interoperation node IWS in this embodiment includes a first update processing module and a first handover processing module;

The first update processing module is configured to detect that the user equipment performs the update processing on the shared encrypted data of the user equipment by interacting with the mobile switching center within a preset time when the long-term evolution network initiates the voice call service of the circuit switched domain;

The first handover processing module is configured to, after the first update processing module performs update processing on the shared encrypted data of the user equipment, initiate a handover procedure to the mobile switching center to switch the user equipment to the target base station of the circuit switched domain.

Referring to FIG. 5, the mobile switching center MSC in this embodiment includes a second update processing module and a second switch processing module.

The second update processing module is configured to: when the interoperation node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, interact with the interoperation node in a preset time to update and process the shared encrypted data of the user equipment. ;

The second handover processing module is configured to: after the second update processing module interacts with the interoperation node to complete the update processing on the shared encrypted data of the user equipment, receive the handover procedure initiated by the interoperation node to switch the user equipment to the target base station in the circuit switched domain. on.

In the foregoing step 201, the IWS may determine whether the UE initiates a voice call service in the CS domain on the LTE network by determining whether the voice start message sent by the UE is received (specifically, may be sent by the GXNA encapsulated 1X initialization message); if the IWS receives the UE The voice start message is sent, indicating that the UE currently initiates a voice call service on the LTE network, and needs to fall back to the CS domain (ie, the CDMA2000 network); if not, it indicates that the UE does not currently initiate a voice call service.

In the foregoing step 201, the update processing of the SSD of the UE by the IWS in the preset time period includes:

The IWS detects that the UE starts timing when the LTE network initiates the voice call service of the CS domain, and judges in a preset time. Whether the SSD update request containing the new authentication data sent by the MSC is received, if it is received, indicating that the SSD needs to be sent to the UE, and the UE is forwarded to the UE; otherwise, it is determined that the SSD update is not required for the UE. After the preset time is reached, the switching process is directly performed. The preset time in this embodiment may be selected according to a specific application scenario, and is preferably 2 seconds.

After the MSC sends the SSD update request including the new authentication data to the IWS, the MSC calculates the first authentication data by using a preset algorithm.

The UE calculates the second verification data by using the same preset algorithm as the MSC according to the new authentication data in the SSD update request, and feeds back to the MSC through the IWS;

The MSC compares the received first verification data with the previously calculated second verification data to obtain a verification result, and the verification result is fed back to the user UE through the IWS;

When the verification result is the same as the first verification data and the second verification data, the user UE locally updates the first verification data, and feeds the update result to the MSC through the IWS. The update result at this time is that the update is successful; the user UE is verifying. The result is that when the first verification data and the second verification data are different, it indicates that the update failed.

For a better understanding of the present invention, the following is a further exemplary description of the process of the UE falling back from the LTE network to the CDMA2000 network, as shown in FIG. 3, including:

Step 301: The UE decides to initiate a CS voice call on the LTE network.

Step 302: The UE sends a GCSNA encapsulated 1X initialization message (including a voice start message) to the IWS;

Step 303: After receiving the 1X initialization message, the IWS creates a corresponding CM service request message and sends it to the MSC.

Step 304: The MSC sends an "Assignment Request" message to the IWS;

Step 305: The IWS sends an “Assignment Complete Message” to the MSC; it should be understood that the step and the foregoing step 304 are based on the steps of the existing protocol, and when the protocol is changed, the two steps may not be performed;

Step 306: The IWS does not immediately trigger the handover process, that is, does not immediately trigger the Handoff Required message, but starts a timer that can be set to start timing;

Step 307: The MSC sends a shared encrypted data update request to the IWS, where the shared encrypted data update request includes new authentication data, and the MSC calculates the new authentication data to obtain the first verification data.

Step 308: The IWS forwards the shared encrypted data update request to the UE, and the UE calculates the new authentication data included in the shared encrypted data update request by using a preset algorithm to obtain the second verification data and feeds back to the IWS, and the IWS passes the “base station challenge. The order" message forwards the second verification data to the MSC;

Step 309: After receiving the second verification data, the MSC determines whether the first verification data and the second verification data are the same, and obtains the verification result, and sends the verification result to the IWS through the “base station response challenge response” message through the authentication response signature.

Step 310: The IWS forwards the verification result to the UE, and the UE performs the SSD update locally according to the verification result. The IWS forwards the "Update Response" message to the MSC, and the SSD update of the UE is completed.

Step 311: The IWS sends a handover request message to the MSC.

Step 312: The MSC sends a handover request message to the corresponding target base station.

Step 313: The target base station allocates a handover request response message to the MSC according to the radio resource specified in the allocation message;

Step 314: The MSC sends a handover command message to the IWS.

Step 315: The IWS sends a GCSNA encapsulated "Universal Handover Designation Message" to the UE to notify the UE to switch to the CDMA2000 system;

Step 316: The EUTRAN system releases the S1 user context, and the 4G bearer is suspended.

Step 317: The IWS sends a handover start message to the UE.

Step 318: The UE switches to the CDMA200 radio channel, and acquires the service channel of the UE in the CDMA2000 base station;

Step 319: The UE sends a handover complete message to the target base station in the CDMA2000.

Step 320: The target base station in CDMA2000 sends a handover complete message to the MSC;

Step 321: The MSC sends a clear command message to the IWS.

Step 322: The IWS sends a Clear Completion Command message to the MSC to inform the MSC that the clearing has been completed.

It can be seen that the embodiment of the present invention can complete the SSD update of the user equipment and complete the handover process of the call process after the user equipment falls back to the CS domain (ie, the CDMA2000 network). The problem of conflicts caused by the SSD update process and the handover process when the UE falls back from the LTE network to the CS domain is avoided.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

Embodiments of the present invention also provide a storage medium. Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described Alternatively, each of them may be fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof may be fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above is a further detailed description of the present invention in connection with the specific embodiments, and the specific embodiments of the present invention are not limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.

Industrial applicability

As described above, the SSD update method and the communication system when the LTE network is dropped from the LTE network to the CS domain have the following beneficial effects: the solution provided by the embodiment of the present invention can be dropped back to the CS domain in the user equipment ( That is, after the CDMA2000 network, the SSD update of the user equipment can be completed first, and then the handover process of the call process is completed. The problem of conflicts caused by the SSD update process and the handover process when the UE falls back from the LTE network to the CS domain is avoided.

Claims

A method for updating shared encrypted data when the long-term evolution network falls back to the circuit-switched domain, including:

The interoperation node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, and performs interaction update processing on the shared encrypted data of the user equipment by interacting with the mobile switching center within a preset time;

After performing the update processing on the shared encrypted data of the user equipment, the interoperation node initiates a handover procedure to the mobile switching center to switch the user equipment to the target base station of the circuit switched domain.
The method for updating a shared encrypted data when the UE is dropped from the long term evolution network to the circuit switched domain according to claim 1, wherein the interoperation node determines the user equipment by determining whether a voice start message sent by the user equipment is received. Whether the voice call service of the circuit switched domain is initiated in the long term evolution network.
The method for updating shared encrypted data when the UE is dropped from the long term evolution network to the circuit switched domain according to claim 1, wherein the interworking node interacts with the mobile switching center to complete sharing encryption of the user equipment within a preset time. The data is updated to include:

When the interoperation node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, the user equipment starts timing, and determines, in the preset time, whether the new authentication data sent by the mobile switching center is received. The shared encrypted data update request, if received, is forwarded to the user equipment for shared encrypted data update; otherwise, it is determined that the shared encrypted data update is not required for the user equipment.
The shared encrypted data updating method when the long term evolution network is dropped back to the circuit switched domain according to any one of claims 1 to 3, wherein the preset time is 2 seconds.
A method for updating shared encrypted data when the long-term evolution network falls back to the circuit-switched domain, including:

When the interworking node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, the mobile switching center performs the update processing on the shared encrypted data of the user equipment by interacting with the interoperation node within a preset time. ;

After the mobile switching center performs an update process on the shared encrypted data of the user equipment by performing interaction with the interworking node, receiving a handover procedure initiated by the interoperation node to switch the user equipment to a target of a circuit switched domain. On the base station.
The method for updating shared encrypted data when the UE is dropped from the long term evolution network to the circuit switched domain according to claim 5, wherein the mobile switching center interacts with the interoperation node to complete the user equipment in a preset time. The sharing of the encrypted data for update processing includes: the mobile switching center transmitting a shared encrypted data update request including new authentication data to the interoperation node within the preset time, and adopting a pre-processing of the new authentication data Setting an algorithm to calculate the first verification data;

Receiving, by the mobile switching center, second verification data that is fed back by the interoperation node, where the second verification data is used by the user equipment according to the new authentication data in the shared encrypted data update request forwarded by the interoperation node. The preset algorithm performs calculation to obtain second verification data;

The mobile switching center performs the comparison verification on the first verification data and the second verification data, and the verification result is fed back to the user equipment by the interoperation node;

Receiving, by the mobile switching center, an update result fed back by the interoperation node, where the update result is that the user equipment locally updates the first when the verification result is that the first verification data and the second verification data are the same The result of the update sent to the interoperation node after verifying the data.
A method for updating shared encrypted data when the long-term evolution network falls back to the circuit-switched domain, including:

The interoperation node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, and performs interaction update processing on the shared encrypted data of the user equipment by interacting with the mobile switching center within a preset time;

After performing the update processing on the shared encrypted data of the user equipment, the interoperation node initiates a handover procedure to the mobile switching center;

The mobile switching center receives the handover procedure initiated by the interworking node to switch the user equipment to a target base station of the circuit switched domain.
An interoperation node includes a first update processing module and a first handover processing module;

The first update processing module is configured to detect that the user equipment performs the update processing on the shared encrypted data of the user equipment by interacting with the mobile switching center within a preset time when the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network. ;

The first switching processing module is configured to, after the first update processing module performs update processing on the shared encrypted data of the user equipment, initiate a handover procedure to the mobile switching center to switch the user equipment to a target of the circuit switched domain. On the base station.
A mobile switching center includes a second update processing module and a second switching processing module;

The second update processing module is configured to, when the interoperation node detects that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network, interact with the interoperation node to complete the user equipment in a preset time. Sharing encrypted data for update processing;

The second handover processing module is configured to: after the second update processing module interacts with the interoperation node to complete update processing on the shared encrypted data of the user equipment, receive a handover procedure initiated by the interoperation node The user equipment switches to a target base station of the circuit switched domain.
A communication system includes: an interoperation node, a mobile switching center, and a target base station;

The interoperation node is configured to perform an update process on the shared encrypted data of the user equipment by interacting with the mobile switching center within a preset time when detecting that the user equipment initiates the voice call service of the circuit switched domain in the long term evolution network; And setting, after performing update processing on the shared encrypted data of the user equipment, initiating a handover procedure to the mobile switching center to switch the user equipment to a target base station of a circuit switched domain;

The mobile switching center is configured to receive a handover procedure initiated by the interoperation node to switch the user equipment Go to the target base station in the circuit switched domain.