CN100459812C - Wireless network system, handover method, and mobile transfer station equipment - Google Patents

Abstract

The invention discloses a wireless network system supporting dual-mode terminal access, in which mobile transfer station equipment is added to the system; the dual-mode mobile terminal is further provided with a wireless ad hoc network mode, and the cellular network access mode or broadband wireless The access mode is switched to the wireless ad hoc network mode. In the wireless ad hoc network mode, the mobile transfer station device is used to access the mobile broadband wireless access network base station or cellular base station; the mobile transfer station device is used for wireless ad hoc network mode , information forwarding between a dual-mode mobile terminal and a mobile broadband wireless access network base station or cellular base station. The invention also discloses the switching method of the system and the mobile transfer station equipment of the system. The application of the present invention reduces the probability of vertical handover of a dual-mode terminal from a mobile broadband network to a cellular network, thereby reducing service inaccessibility or call failure caused by access control during the vertical handover process, and improving service performance. For real-time business, it has more practical significance.

Description

Wireless network system, handover method, and mobile transfer station equipment

technical field

The invention relates to the technical field of wireless communication, in particular to a wireless network system supporting dual-mode terminal access, a handover method and mobile transfer station equipment.

Background technique

With the IP-based network, the cellular mobile network is developing towards All-IP (ALL-IP); various broadband access technologies, such as wireless local area network (WLAN), wireless metropolitan area network (WMAN) and mobile broadband wireless access ( MBWA), etc., are based on IP technology. Although data services are developing rapidly, voice services are still the most important and common. The traditional circuit-switched mobile voice service will be replaced by the voice over wireless packet service (VoIPoW); although the broadband access technology is aimed at the data service, it is necessary to support the voice service.

VoIPoW introduces the flexibility of IP, but it is not as good as traditional circuit-switched voice services in terms of spectrum utilization and voice quality QOS. Therefore, it is necessary to use the current wireless broadband access network to support the cellular mobile network and improve the performance of VoIPoW. In this way, a dual-mode terminal with a cellular working mode and a broadband access mode and a wireless network supporting dual-mode terminal access appear.

Referring to FIG. 1 , FIG. 1 is a schematic diagram of a wireless network system supporting dual-mode terminal access in the prior art. A wireless network that supports dual-mode terminal access is usually based on the IP Multimedia Subsystem (IMS) and SIP protocol. As shown in Fig. 1, the network system includes: an IMS core network, a cellular network base station (C-BS), a mobile broadband wireless access network base station (W-BS), and a dual-mode mobile terminal (MH).

Among them, the IMS core network includes Call Session Control Function (Call Session Control Function, CSCF) entities: including Proxy CSCF (Proxy CSCF, P-CSCF), Serving CSCF (Serving CSCF, S-CSCF) and Interrogating CSCF (Interrogating CSCF, I-CSCF) CSCF) three functional entities, responsible for processing the user's multimedia session. Its functions include: multimedia session control, address translation, and service conversion for business negotiation. It is equivalent to a SIP server and is used to complete the call gateway function, call service trigger function and Routing function.

Cellular network base station (C-BS): It has the bearer function of various wireless data services such as VoIPoW service, mobile videophone, and mobile streaming media service.

Mobile broadband wireless access network base station (W-BS): such as WLAN access point (AP), IEEE802.16E BS or MBWA base station, etc., support broadband wireless access of dual-mode mobile terminals.

The dual-mode mobile terminal (MH) has two air interfaces of cellular and mobile broadband wireless access. It can access the cellular network and wireless mobile broadband network through the cellular air interface and broadband access air interface, and use the cellular air interface or broadband wireless air interface to carry VoIPoW.

At present, most solutions to ensure service continuity basically consider vertical handover between heterogeneous wireless networks, and try to ensure service continuity by performing vertical handover based on the location of the terminal and the strength of the received signal.

The following example illustrates the vertical switching process.

Assume that at the beginning, the dual-mode mobile phone (MS) performs VoIPoW services through the WLAN network, and at the same time, the MS searches for beacons of the cellular mobile network according to system parameters. When the average signal strength of the cell received by the MS is greater than the threshold of the vertical handover, the MS accesses the cellular network at the same time, so that the MS has the capability of macro diversity. When the average signal strength of the cell is greater than a certain value of the vertical handover threshold, the MS releases the connection with the WLAN, only connects to the cell, and searches for adjacent cellular network base stations at the same time to perform horizontal handover.

On the contrary, the principle of handover from cellular to WLAN is similar, and the description will not be repeated here.

It can be seen that the access control problem in the vertical handover process is not considered in the prior art. When the MS accesses the cellular network from the WLAN, if the current base station cannot access due to capacity limitation, a call drop will occur. When the MS initiates a VoIPoW call in this situation, the call is also unsuccessful due to call blocking. vice versa.

In practical application, in order to eliminate the small-scale signal blind area or weak signal area of the mobile communication network, repeaters (Repeaters) can be set in the network. The repeater is a kind of radio transmission relay equipment that acts as a signal booster in the process of wireless communication transmission. Its basic function is a radio frequency signal power booster, which works between the base station and the mobile terminal. It has two wireless interfaces: one of which is The donor antenna is used for transmitting and receiving signals with the base station, and the other is a retransmitting antenna, used for transmitting and receiving signals with the mobile terminal.

Contents of the invention

In view of this, the first main purpose of the present invention is to provide a wireless network system that supports dual-mode terminal access, which can reduce the failure of service access or call failure caused by access control during the vertical handover process. Condition.

Another main purpose of the present invention is to provide a method for handover of a dual-mode terminal. By applying the method, it is possible to reduce the failure of services or call failures caused by access control during the vertical handover process.

The third main purpose of the present invention is to provide a mobile transfer device, which can be applied to the above-mentioned wireless network system, so that the system can reduce the failure of service access or call failure caused by access control during the vertical handover process. Condition.

In order to achieve the first aspect of the above object, the present invention provides a wireless network system that supports dual-mode terminal access, at least including: an IMS core network, a cellular network base station, a mobile broadband wireless access network base station, and a dual-mode mobile terminal The IMS core network is connected to the cellular network base station and the mobile broadband wireless access network base station respectively for service control; the dual-mode mobile terminal is used for cellular network access mode or broadband wireless access mode, through the cellular network Network base stations or mobile broadband wireless access network base stations are connected to the IMS core network, and the system also includes mobile transfer station equipment;

The dual-mode mobile terminal is further provided with a wireless ad hoc network mode, which is switched from a cellular network access mode or a broadband wireless access mode to a wireless ad hoc network mode as required, and in the wireless ad hoc network mode is connected through a mobile transfer station device. access to mobile broadband wireless access network base stations or cellular network base stations;

The mobile transfer station device is used for forwarding information between a dual-mode mobile terminal and a mobile broadband wireless access network base station or a cellular network base station in a wireless ad hoc network mode.

The system may include multiple mobile transfer station devices, and each mobile transfer station device adopts a proactive wireless ad hoc network protocol for information forwarding of dual-mode terminals in a predetermined area.

The mobile transfer station device may be a mobile transfer station device with proxy authentication and/or proxy accounting functions.

The mobile transfer station equipment at least includes a main control module, an information processing module and two antenna interfaces;

Wherein, the first antenna interface is used to communicate with the dual-mode mobile terminal in the wireless ad hoc network mode; the second antenna interface is used to communicate with the mobile broadband wireless access network base station in the broadband wireless access mode;

The main control module is connected to the information processing module for controlling the information processing module;

The information processing module is respectively connected to the main control module and the two antenna interfaces, and is used to forward the information received from the two antenna interfaces to each other under the control of the main control module.

The mobile transfer station device may further include: a protocol conversion module connected to the main control module and the information processing module, and a third antenna interface connected to the information processing module;

The information processing module further sends the information received from the first antenna interface to the protocol conversion module for protocol conversion, and sends the converted information returned by the protocol conversion module to the cellular network base station through the third antenna interface; The received information is sent to the protocol conversion module for protocol conversion, and the converted information returned by the protocol conversion module is sent to the dual-mode terminal through the first antenna interface;

The protocol conversion module is respectively connected to the main control module and the information processing module, and is used to convert the information received from the first antenna interface forwarded by the information processing module into a format that can be received by the cellular network base station and return it under the control of the main control module to the information processing module; or convert the information received from the third antenna interface forwarded by the information processing module into a format receivable by the broadband wireless air interface of the dual-mode terminal and return it to the information processing module.

The cellular network base station may be a cellular network base station with functions of carrying packet wireless voice services, mobile videophones, and mobile streaming media services.

In the system, multiple mobile broadband wireless access network base stations form a grid network, and the grid network adopts a proactive wireless ad hoc network protocol.

In order to achieve the second aspect of the above object, the present invention provides a dual-mode terminal switching method, which is applied to the above-mentioned wireless network system. When the dual-mode terminal executes a service process in the broadband wireless access mode, the switching process includes :

A. Determine whether mode switching is required, and if yes, execute step B; otherwise, return to this step;

B. Switch to the working mode of the wireless ad hoc network, access the mobile broadband wireless access network base station or cellular network base station that the mobile transfer station equipment can access through the mobile transfer station equipment in the system, and continue the business.

The method for judging whether mode switching is required as described in step A may be: the dual-mode terminal detects the state of the broadband wireless air interface in real time, and judges whether mode switching is required according to whether the wireless broadband signal is smaller than the switching threshold;

Or the dual-mode terminal determines whether mode switching is required according to user configuration;

Or set a mode switching switch or a switching interface on the dual-mode terminal, and determine whether mode switching is required according to the user's choice.

The dual-mode terminal may determine that mode switching is required when the predetermined service time is exceeded according to user configuration, or determine that mode switching is required when the amount of service data configured by the user is less than the predetermined amount.

In the wireless ad hoc network mode, the dual-mode terminal uses a broadband wireless air interface to perform information interaction with the mobile transfer station equipment;

The method described in step B to access the base station of the mobile broadband wireless access network that the mobile transfer station device can access through the mobile transfer station device in the system may be:

The mobile transfer station equipment directly forwards the information received from the broadband wireless air interface of the dual-mode terminal to the mobile broadband wireless access network base station; directly forwards the information received from the mobile broadband wireless access network base station to the dual-mode terminal.

In the wireless ad hoc network mode, the dual-mode terminal uses a broadband wireless air interface to perform information interaction with the mobile transfer station equipment;

The method may further include:

The mobile transfer station equipment converts the information received from the broadband wireless air interface of the dual-mode terminal into a format that the cellular network base station can receive and forwards it to the cellular network base station; converts the information received from the cellular network base station into the broadband wireless air interface of the dual-mode terminal The format that can be received is forwarded to the dual-mode terminal.

The method may further include: during the initialization process of the dual-mode terminal, accessing the cellular network and the broadband wireless network, and if the broadband wireless access is unsuccessful, using the wireless ad hoc network mode to access the broadband wireless network.

The method may further include: if the dual-mode terminal cannot access the broadband wireless network through the broadband wireless access mode and the wireless ad hoc network mode within the predetermined search time or when the predetermined search times are reached, then stop searching the broadband wireless network.

The method may also include: dividing all wireless data services supported by the dual-mode terminal into important services and non-important services according to user needs in advance, or dividing different calls of a service into important services and non-important services;

Perform important services through the air interface of the cellular network, and perform non-essential services through the broadband wireless access mode.

When the air interface of the cellular network is performing an important business process and needs to switch modes, the broadband wireless air interface can be activated to directly switch to the working mode of the wireless ad hoc network.

When the air interface of the cellular network is performing important services and needs to switch modes, start the broadband wireless air interface, or switch to the broadband wireless access mode first, and switch to the wireless ad hoc network working mode when the broadband wireless access mode fails .

When the cellular network air interface is performing important services, it can detect the status of the cellular network air interface in real time, and determine whether mode switching is required according to whether the cellular network signal is less than the switching threshold;

Or the dual-mode terminal determines whether mode switching is required according to user configuration;

Or set a mode switching switch or a switching interface on the dual-mode terminal, and determine whether mode switching is required according to the user's choice.

The dual-mode terminal may determine that mode switching is required when the predetermined service time is exceeded according to user configuration, or determine that mode switching is required when the amount of service data configured by the user is less than the predetermined amount.

The method for switching to the working mode of the wireless ad hoc network may be:

Switch the broadband wireless air interface to the wireless ad hoc network working mode, and perform the wireless ad hoc network routing discovery process. After receiving the routing response returned by the mobile transfer station device in the network, establish a connection with the mobile transfer station device.

In order to achieve the third aspect of the above object, the present invention provides a mobile transfer station device, which at least includes a main control module, an information processing module and two antenna interfaces;

Wherein, the first antenna interface is used to communicate with the dual-mode mobile terminal in the wireless ad hoc network mode; the second antenna interface is used to communicate with the mobile broadband wireless access network base station in the broadband wireless access mode;

The main control module is connected to the information processing module for controlling the information processing module;

The information processing module is respectively connected to the main control module and the two antenna interfaces, and is used to forward the information received from the two antenna interfaces to each other under the control of the main control module.

The mobile transfer station device may further include: a protocol conversion module connected to the main control module and the information processing module, and a third antenna interface connected to the information processing module;

The information processing module further sends the information received from the first antenna interface to the protocol conversion module for protocol conversion, and sends the converted information returned by the protocol conversion module to the cellular network base station through the third antenna interface; The received information is sent to the protocol conversion module for protocol conversion, and the converted information returned by the protocol conversion module is sent to the dual-mode terminal through the first antenna interface;

The protocol conversion module is respectively connected to the main control module and the information processing module, and is used to convert the information received from the first antenna interface forwarded by the information processing module into a format that can be received by the cellular network base station and return it under the control of the main control module to the information processing module; or convert the information received from the third antenna interface forwarded by the information processing module into a format receivable by the broadband wireless air interface of the dual-mode terminal and return it to the information processing module.

It can be seen from the above technical solutions that the wireless network system and handover method and mobile relay station equipment supporting dual-mode terminal access of the present invention add the mobile relay station (MRS) equipment to the system, and adopt wireless ad hoc network (Ad Hoc) technology enables dual-mode terminals to switch between cellular network access mode, broadband wireless access mode, and Ad Hoc mode. When the dual-mode terminal performs business through the broadband wireless access mode, when it needs to switch modes, it does not directly switch to the cellular network access mode, but switches to the Ad Hoc working mode, and accesses through the added MRS device in the system. Go to other base stations and continue the business.

Switching from broadband access mode to Ad Hoc mode is a switch in a mobile broadband network such as WLAN, which belongs to horizontal switching. Therefore, the probability of vertical switching of a dual-mode terminal from a mobile broadband network such as WLAN to a cellular network is reduced, thereby enabling Reduce the situation that the service cannot be accessed or the call fails due to the access control during the vertical handover process.

At the same time, because the time of horizontal switching is relatively short compared with vertical switching, the switching time is usually shorter, so the probability of vertical switching is reduced, and the time delay occupied by switching is shortened, and the service performance is improved, especially for real-time services, which is more practical; For non-real-time services, the effect of reducing data packet loss in the switching process can also be achieved.

Description of drawings

FIG. 1 is a schematic diagram of a wireless network system supporting dual-mode terminal access in the prior art;

FIG. 2 is a schematic diagram of a wireless network system supporting dual-mode terminal access according to a preferred embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a preferred embodiment of mobile transfer station equipment;

FIG. 4 is a schematic flow diagram of dual-mode terminal initialization in the system shown in FIG. 2;

FIG. 5 is a schematic flow diagram of a dual-mode terminal processing a VoIPoW service in the system shown in FIG. 2 .

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

The wireless network system supporting dual-mode terminal access and its service access method of the present invention adds a mobile relay station (MRS) terminal to the system, and adopts the wireless ad hoc network (AdHoc) technology of a broadband wireless network to enable dual The modular terminal can switch among the three working modes of cellular network access mode, broadband wireless access mode, and Ad Hoc mode. When the dual-mode terminal performs business through the broadband wireless access mode, when it needs to switch modes, it does not directly switch to the cellular network access mode, but switches to the Ad Hoc working mode, and accesses through the added MRS terminal in the system. Go to other base stations and continue the business. Only when the Ad Hoc working mode access fails, the vertical handover process is executed to switch to the cellular network access mode.

Referring to FIG. 2, FIG. 2 is a schematic diagram of a wireless network system supporting dual-mode terminal access according to a preferred embodiment of the present invention. The wireless network system of the present embodiment adopts a three-layer networking scheme, the first layer is a grid (MESH) network, the second layer is a mobile transit network, and the third layer is a traditional Ad Hoc network. The wireless network in this embodiment is also based on the IP Multimedia Subsystem (IMS) and the SIP protocol. As shown in Figure 2, the network system not only includes: IMS core network, cellular network base station (C-BS), mobile broadband wireless access network base station (W-BS), dual-mode mobile terminal (MH) but also mobile transfer station (MRS) equipment.

Among them, the IMS core network is the same as the prior art shown in Figure 1, and also includes Call Session Control Function (Call Session Control Function, CSCF) entities: including Proxy CSCF (Proxy CSCF, P-CSCF), Serving CSCF (Serving CSCF, S -CSCF) and Interrogating CSCF (Interrogating CSCF, I-CSCF) are three functional entities responsible for processing user multimedia sessions. Their functions include: multimedia session control, address translation, and service conversion for business negotiation, which are equivalent to SIP servers. To complete the call gateway function, call service trigger function and route selection function.

Cellular network base station (C-BS): same as the prior art shown in FIG. 1 , it has the bearer function of various wireless data services such as VoIPoW service, mobile videophone, and mobile streaming media service.

Mobile broadband wireless access network base station (W-BS): such as WLAN access point (AP), IEEE802.16E BS or MBWA base station, etc., supports MESH networking and broadband wireless access of dual-mode mobile terminals. In the first layer of MESH network.

W-BS is static, and multiple W-BSs form a MESH network. Since the change of the network topology is only affected by the state of the wireless link, the topology update is not very frequent. Therefore, the first-layer MESH network adopts a proactive Ad Hoc routing protocol, such as the wireless routing protocol WRP (Wireless Routing Protocol ).

Mobile relay station (Mobile Relay Station, MRS) equipment, MRS equipment has a cellular air interface and a broadband wireless air interface, is in the second-layer transit network, and is responsible for the forwarding of cellular access and broadband wireless access. Each MRS is responsible for the access of the MH in the predetermined area to the core network, and adopts the Proactive Ad Hoc routing protocol.

The MRS device used in this embodiment may be a three-antenna dual-mode device, and its structure is shown in FIG. 3 . FIG. 3 is a schematic structural diagram of a preferred embodiment of the mobile transfer station device. The MRS device includes: a first antenna interface 300 , a second antenna interface 301 , a third antenna interface 302 , a main control module 303 , an information processing module 304 and a protocol conversion module 305 .

Wherein, the first antenna interface 300 is used to communicate with the dual-mode mobile terminal in the Ad Hoc mode; the second antenna interface 301 is used to communicate with the W-BS in the broadband wireless access mode.

The main control module 303 is respectively connected to the information processing module 304 and the protocol conversion module 305 for controlling the information processing module 304 and the protocol conversion module 305 .

The information processing module 304 is connected to the main control module 303 and the three antenna interfaces respectively, and is used for forwarding the information received from the three antenna interfaces under the control of the main control module 303 .

Specifically, the information processing module 304, under the control of the main control module 303, directly forwards the information sent by the dual-mode terminal received from the first antenna interface 300 to the W-BS through the second antenna interface; The information received by the interface 300 is sent to the protocol conversion module 305 for protocol conversion, and then forwarded to the C-BS through the third antenna interface 302; or the information received from the second antenna interface 301 is forwarded to the dual-mode terminal, and the third The information received by the antenna interface 302 is sent to the protocol conversion module 305 for protocol conversion, and then forwarded to the dual-mode terminal through the first antenna interface 300 .

Here, whether the information processing module 304 forwards the information received from the first antenna interface 300 to the W-BS directly by the second antenna interface 301, or sends the information to the protocol conversion module 305 for protocol conversion, and then through the third The antenna interface 302 forwards to the C-BS, which can be pre-configured. For example, some services are forwarded through the W-BS, and others are forwarded through the C-BS. It can also be forwarded through the C-BS when the W-BS cannot be accessed.

The protocol conversion module 305 in FIG. 3 is configured to: under the control of the main control module 303: convert the information received from the first antenna interface 300 forwarded by the information processing module 304 into a format that can be received by the C-BS and return it to the information processing module 304 ; or convert the information received from the third antenna interface 302 forwarded by the information processing module 304 into a format receivable by the broadband wireless air interface of the dual-mode terminal and return it to the information processing module 304 .

Of course, if the dual-mode terminal only needs to access the W-BS through the MRS device in the Ad Hoc working mode, and does not need to access the C-BS, then a dual-antenna dual-mode device can be used. The dual-antenna dual-mode device only includes: a first antenna interface for communicating with a dual-mode terminal, a second antenna interface for communicating with a W-BS, a main control module and an information processing module. Its working principle is basically the same as that of the three-antenna dual-mode device shown in Figure 3, with only two differences: there is no protocol conversion module 305, and there is no third antenna interface 302 for communicating with the C-BS.

Since the dual-mode terminal accesses the W-BS through the MRS device in Ad Hoc mode without protocol conversion, it can save the resource consumption of the MRS device and shorten the delay. Therefore, it is recommended to use the MRS device with dual-antenna and dual-mode into the way W-BS works.

It can be seen that the dual-mode terminal can communicate with the W-BS or the C-BS by means of the MRS device as required. Compared with C-BS and W-BS, the biggest feature of MRS equipment is its mobility; compared with MH, MRS equipment has more powerful functions, and usually has the functions of proxy security authentication and/or proxy billing. Simply put , that is, the user information, usage records and other information are forwarded to the core network through the MRS device, and the core network performs security authentication and billing for the dual-mode terminal connected according to the information.

Dual-mode mobile terminal (MH), with cellular and mobile broadband wireless access air interfaces, can access cellular network and wireless mobile broadband network through cellular air interface and broadband access air interface, and has cellular network access, broadband access and Ad Hoc three working modes, in the third-layer Ad Hoc network, is the consumer of wireless data services such as VoIPoW. The Ad Hoc network on the third layer adopts the Reactive Ad Hoc routing protocol. The dual-mode mobile terminal can switch from cellular network access mode or broadband wireless access mode to Ad Hoc mode as needed, and access W-BS or C-BS through MRS equipment in Ad Hoc mode.

From the network system structure shown in Figure 2, it can be seen that the number of dual-mode terminals connected to the C-BS or W-BS can be increased due to the use of MRS equipment, so the capacity of the cellular network and wireless broadband network can be increased.

The MRS transit network on the second layer and the Ad Hoc network on the third layer constitute a layered Ad Hoc network, which can use non-planar Ad Hoc routing protocols, such as the zone routing protocol ZRP (ZoneRouting Protocol).

Referring to FIG. 4 , FIG. 4 is a schematic flow chart of dual-mode terminal initialization in the system shown in FIG. 2 . The process includes the following steps:

In steps 400-401, after the dual-mode terminal is powered on, it reads the configuration table (PROFILE), and the broadband air interface is in the access mode. Since the topology of the Ad Hoc network changes relatively frequently, the working mode of the broadband wireless air interface is the access mode by default.

Step 402, access the cellular network. The method for accessing the cellular network in this step is the same as that of the prior art, and will not be described in detail here.

In step 403, the W-BS is searched in the broadband access mode, and it is judged whether it is successful, and if yes, step 407 is performed; otherwise, step 404 is performed.

Step 404, adopt Ad Hoc mode, search for W-BS through the MRS device in the network, and judge whether it is successful, if yes, execute step 407; otherwise, execute step 405.

Step 405, recording the number of failed searches through broadband wireless access and Ad Hoc mode.

Step 406, judging whether the predetermined number of failures has been reached, if yes, stop searching the broadband wireless network; otherwise, return to step 403.

In this embodiment, the method of recording the number of times is used to stop searching the broadband wireless network. In practical applications, a timing method can also be used. When starting the search, a timer is started. Then stop searching for broadband wireless networks.

Step 407, the dual-mode terminal enters the standby state, and the interface shows that it is in the cellular access mode.

In the present invention, all wireless data services supported by the dual-mode terminal can be divided into important services and non-important services in advance according to user needs, for example, VoIPoW service is set as important service, and mobile streaming service is set as non-important service. Different calls of a service can also be divided into important services and non-important services. For example, for VoIPoW services, calling called user A is an important service, and calling called user B is a non-important service. It can be set to perform important services through the air interface of the cellular network, and to perform non-essential services through the broadband access mode.

Hereinafter, taking the VoIPoW service as an example, the handover method in the present invention will be further described in detail. In this embodiment, at first the user sorts the different calls of VoIPoW services according to their importance, divides important services and non-important services, and sets to execute important services through the air interface of the cellular network, and the Ad Hoc working mode of mobile broadband is used as a supplement; The access mode performs non-important services, and the Ad Hoc working mode of mobile broadband is used as a supplement; and relevant information is stored in the dual-mode terminal.

In this way, the important business is executed through the air interface of the cellular network, and the non-important business is executed through the broadband access mode, so that the cellular VoIPoW business can be offloaded, and the probability of blocking and call drop can be reduced. In addition, for non-important calls, mobile users pay more attention to the price, so they use mobile broadband wireless access.

Referring to FIG. 5 , FIG. 5 is a schematic flowchart of processing VoIPoW services by a dual-mode terminal in the system shown in FIG. 2 . The process includes the following steps:

Steps 500-501, start to process the VoIPoW service, and judge whether it is a scheduled important service according to the pre-stored settings, if yes, execute step 502; otherwise, execute step 506.

Step 502, use the cellular network access mode.

In step 503, it is judged whether access is possible, and if yes, step 504 is executed; otherwise, outgoing VoIPoW services are blocked or switching is blocked, and step 506 is executed.

In this step, after receiving the access request of the dual-mode terminal, the network side determines whether to allow the terminal to access according to the current network resource situation according to the access control mechanism, and sends an access message containing the access information. enter the response. The dual-mode terminal determines whether it can access according to the response.

Step 504, the dual-mode terminal accesses the C-BS, and detects the working status of the cellular air interface in real time.

Step 505, according to whether the current cellular network signal is lower than the switching threshold, determine whether mode switching is required, if yes, execute step 506; otherwise, return to step 503.

In this step, the dual-mode terminal can also determine whether mode switching is required according to user configuration; or set a mode switching switch or a switching interface on the dual-mode terminal, and determine whether mode switching is required according to user selection.

For example: according to the user configuration, the dual-mode terminal determines that mode switching is required when the predetermined service time exceeds; or when the amount of service data configured by the user is less than the predetermined amount, it determines that the mode switching is required.

Step 506, start the broadband wireless air interface, and use the broadband wireless access mode.

In step 507, it is judged whether access is possible, and if yes, step 508 is executed; otherwise, outgoing VoIPoW services are blocked or handover is blocked, and step 510 is executed.

In this step, after receiving the access request of the dual-mode terminal, the network side determines whether to allow the terminal to access according to the current network resource situation according to the access control mechanism, and sends an access request containing the access information. enter the response. The dual-mode terminal determines whether it can access according to the response.

Step 508, the dual-mode terminal accesses the W-BS, and detects the working status of the broadband wireless air interface in real time.

Step 509, according to whether the current mobile broadband wireless network signal is smaller than the switching threshold, determine whether mode switching is required, if yes, perform step 510; otherwise, return to step 508.

In this step, the dual-mode terminal can also determine whether mode switching is required according to user configuration; or set a mode switching switch or a switching interface on the dual-mode terminal, and determine whether mode switching is required according to user selection.

For example: according to the user configuration, the dual-mode terminal determines that mode switching is required when the predetermined service time exceeds; or when the amount of service data configured by the user is less than the predetermined amount, it determines that the mode switching is required.

Step 510, switch to the Ad Hoc mode and continue the business.

In this step, the method for the dual-mode terminal to switch to the Ad Hoc mode can be: switch the broadband wireless air interface to the wireless ad hoc network working mode, and perform the wireless ad hoc network route discovery process, when receiving the return from the mobile transfer station device in the network After the routing responds, establish a connection with the mobile transfer station device.

In this way, the dual-mode terminal can forward information to the base station through the MRS device and access the IMS core network. Specifically, the MRS device can directly forward the information received from the broadband wireless air interface of the dual-mode terminal to the W-BS; and directly forward the information received from the W-BS to the dual-mode terminal.

If the MRS device shown in Figure 3 is used, the MRS device can also convert the information received from the broadband wireless air interface of the dual-mode terminal into a format that the C-BS can receive and forward it to the C-BS; the information received from the C-BS , converted into a format that can be received by the broadband wireless air interface of the dual-mode terminal and forwarded to the dual-mode terminal.

As for whether the MRS device forwards directly or after protocol conversion, it can be pre-configured. For example, some services are forwarded through the W-BS, and others are forwarded through the C-BS. C-BS forwarding.

The dual-mode terminal can access the IMS core network through one W-BS, or can use a relay mode to access the IMS core network after being relayed by multiple W-BSs.

In this embodiment, when the cellular network air interface is performing an important business process and needs to switch modes, start the broadband wireless air interface, first switch to the broadband access mode, and switch to the wireless ad hoc network when the broadband access mode fails model. In practical applications, when the cellular network air interface is performing important services and needs to switch modes, it can directly switch to the wireless ad hoc network working mode after starting the broadband wireless air interface.

In the case of unsuccessful Ad Hoc working mode, you can consider switching to the cellular network. In this way, the number of vertical switching is greatly reduced, and most of the switching is equivalent to horizontal switching. Therefore, on the basis of reducing call blocking and call drop probability, the handover delay is greatly reduced, and the energy consumption of dual-mode terminals is reduced through the Ad Hoc mode.

It can be seen from the above-mentioned embodiments that the wireless network system supporting dual-mode terminal access, the handover method and the mobile transfer station equipment of the present invention can increase the capacity of the cellular network and the wireless broadband network; reduce the capacity of the cellular network and the wireless broadband network. Call blocking rate and service interruption probability; reduce the number of vertical handovers, greatly reduce the handover delay, and improve the performance of real-time services; reduce the energy consumption of dual-mode terminals through the Ad Hoc method; through the mobile transfer station MRS, ensure The operation and management of the business is improved; the mobile transfer station MRS balances the load of the cellular network and the wireless broadband network.

Claims (22)

1. A wireless network system supporting dual-mode terminal access, at least including: an IMS core network, a cellular network base station, a mobile broadband wireless access network base station, and a dual-mode mobile terminal; the IMS core network and the cellular network base station, mobile The broadband wireless access network base stations are connected separately for service control; the dual-mode mobile terminal is used to access the network through the cellular network base station or the mobile broadband wireless access network base station in the cellular network access mode or broadband wireless access mode To the IMS core network, it is characterized in that: the system also includes mobile transfer station equipment; The dual-mode mobile terminal is further provided with a wireless ad hoc network mode, which is switched from a cellular network access mode or a broadband wireless access mode to a wireless ad hoc network mode as required, and in the wireless ad hoc network mode is connected through a mobile transfer station device. access to mobile broadband wireless access network base stations or cellular network base stations; The mobile transfer station device is used for forwarding information between a dual-mode mobile terminal and a mobile broadband wireless access network base station or a cellular network base station in a wireless ad hoc network mode. 2. The wireless network system according to claim 1, characterized in that: the system includes a plurality of mobile transfer station devices, and each mobile transfer station device adopts a proactive wireless ad hoc network protocol for wireless communication within a predetermined area Information forwarding of dual-mode terminals. 3. The wireless network system according to claim 2, wherein the mobile transfer station device is a mobile transfer station device with proxy authentication and/or proxy accounting functions. 4. The wireless network system according to claim 2 or 3, characterized in that: said mobile transfer station equipment at least includes a main control module, an information processing module and two antenna interfaces; Wherein, the first antenna interface is used to communicate with the dual-mode mobile terminal in the wireless ad hoc network mode; the second antenna interface is used to communicate with the mobile broadband wireless access network base station in the broadband wireless access mode; The main control module is connected to the information processing module for controlling the information processing module; The information processing module is respectively connected to the main control module and the two antenna interfaces, and is used to forward the information received from the two antenna interfaces to each other under the control of the main control module. 5. The wireless network system according to claim 4, characterized in that: The mobile transfer station device further includes: a protocol conversion module connected to the main control module and the information processing module, and a third antenna interface connected to the information processing module; The information processing module further sends the information received from the first antenna interface to the protocol conversion module for protocol conversion, and sends the converted information returned by the protocol conversion module to the cellular network base station through the third antenna interface; The received information is sent to the protocol conversion module for protocol conversion, and the converted information returned by the protocol conversion module is sent to the dual-mode terminal through the first antenna interface; The protocol conversion module is respectively connected to the main control module and the information processing module, and is used to convert the information received from the first antenna interface forwarded by the information processing module into a format that can be received by the cellular network base station and return it under the control of the main control module to the information processing module; or convert the information received from the third antenna interface forwarded by the information processing module into a format receivable by the broadband wireless air interface of the dual-mode terminal and return it to the information processing module. 6. The wireless network system according to claim 1, characterized in that: said cellular network base station is a cellular network base station with functions of carrying packet wireless voice service, mobile videophone, and mobile streaming media service. 7. The wireless network system according to claim 1, wherein a plurality of mobile broadband wireless access network base stations in the system form a grid network, and the grid network adopts a proactive wireless ad hoc network protocol. 8. A switching method for a dual-mode terminal, characterized in that it is applied to the network system according to claim 1, and when the dual-mode terminal executes a service process in the broadband wireless access mode, the switching process includes: A. Determine whether mode switching is required, and if yes, execute step B; otherwise, return to this step; B. Switch to the working mode of the wireless ad hoc network, access the mobile broadband wireless access network base station or cellular network base station that the mobile transfer station equipment can access through the mobile transfer station equipment in the system, and continue the business. 9. The switching method according to claim 8, wherein the method for judging whether mode switching is required in step A is: the dual-mode terminal detects the status of the broadband wireless air interface in real time, and judges whether the wireless broadband signal is smaller than the switching threshold. Whether mode switching is required; Or the dual-mode terminal determines whether mode switching is required according to user configuration; Or set a mode switching switch or a switching interface on the dual-mode terminal, and determine whether mode switching is required according to the user's choice. 10. The switching method according to claim 9, characterized in that: the dual-mode terminal determines that mode switching is required when the predetermined service time exceeds according to the user configuration; A mode switch is required. 11. The switching method according to claim 8, characterized in that: the dual-mode terminal uses a broadband wireless air interface to exchange information with mobile transfer station equipment in the wireless ad hoc network mode; The method described in step B to access the base station of the mobile broadband wireless access network that the mobile transfer station device can access through the mobile transfer station device in the system is: The mobile transfer station equipment directly forwards the information received from the broadband wireless air interface of the dual-mode terminal to the mobile broadband wireless access network base station; directly forwards the information received from the mobile broadband wireless access network base station to the dual-mode terminal. 12. The switching method according to claim 8, characterized in that: the dual-mode terminal uses a broadband wireless air interface to exchange information with the mobile transfer station equipment in the wireless ad hoc network mode; The method further includes: The mobile transfer station equipment converts the information received from the broadband wireless air interface of the dual-mode terminal into a format that the cellular network base station can receive and forwards it to the cellular network base station; converts the information received from the cellular network base station into the broadband wireless air interface of the dual-mode terminal The format that can be received is forwarded to the dual-mode terminal. 13. The handover method according to claim 8, further comprising: during the initialization process of the dual-mode terminal, accessing the cellular network and the broadband wireless network, and if the broadband wireless access is unsuccessful, using the wireless automatic Networking mode to access broadband wireless network. 14. The handover method according to claim 13, characterized in that the method further comprises: if within the predetermined search time or when the predetermined number of searches is reached, the dual-mode terminal passes both the broadband wireless access mode and the wireless ad hoc network mode If the broadband wireless network cannot be accessed, the search for the broadband wireless network is stopped. 15. The switching method according to claim 8, further comprising: dividing all wireless data services supported by the dual-mode terminal into important services and non-important services according to user needs in advance, or for one service Different calls are divided into important business and non-important business; Perform important services through the air interface of the cellular network, and perform non-essential services through the broadband wireless access mode. 16. The switching method according to claim 15, characterized in that, when the cellular network air interface is performing important services and mode switching is required, the broadband wireless air interface is activated to directly switch to the working mode of the wireless ad hoc network. 17. The switching method according to claim 15, characterized in that, when the cellular network air interface is performing important services and mode switching is required, start the broadband wireless air interface, switch to the broadband wireless access mode first, and then switch to the broadband wireless access mode. When the entry mode fails, switch to the wireless ad hoc network working mode. 18. The handover method according to claim 16 or 17, characterized in that, when the air interface of the cellular network is performing an important business process, the state of the air interface of the cellular network is detected in real time, and whether it is necessary to perform mode switch; Or the dual-mode terminal determines whether mode switching is required according to user configuration; Or set a mode switching switch or a switching interface on the dual-mode terminal, and determine whether mode switching is required according to the user's choice. 19. The switching method according to claim 18, characterized in that: according to the user configuration, the dual-mode terminal determines that it needs to switch modes when the predetermined service time exceeds; or according to the user configuration, when the amount of service data is less than the predetermined amount, it determines A mode switch is required. 20. The switching method according to claim 8, 16 or 17, characterized in that the method of switching to the working mode of the wireless ad hoc network is: Switch the broadband wireless air interface to the wireless ad hoc network working mode, and perform the wireless ad hoc network routing discovery process. After receiving the routing response returned by the mobile transfer station device in the network, establish a connection with the mobile transfer station device. 21. A mobile transfer station device, characterized in that it includes at least a main control module, an information processing module and two antenna interfaces; Wherein, the first antenna interface is used to communicate with the dual-mode mobile terminal in the wireless ad hoc network mode; the second antenna interface is used to communicate with the mobile broadband wireless access network base station in the broadband wireless access mode; The main control module is connected to the information processing module for controlling the information processing module; The information processing module is respectively connected to the main control module and the two antenna interfaces, and is used to forward the information received from the two antenna interfaces to each other under the control of the main control module. 22. The mobile transfer station device according to claim 21, characterized in that: The mobile transfer station device further includes: a protocol conversion module connected to the main control module and the information processing module, and a third antenna interface connected to the information processing module; The information processing module further sends the information received from the first antenna interface to the protocol conversion module for protocol conversion, and sends the converted information returned by the protocol conversion module to the cellular network base station through the third antenna interface; The received information is sent to the protocol conversion module for protocol conversion, and the converted information returned by the protocol conversion module is sent to the dual-mode terminal through the first antenna interface; The protocol conversion module is respectively connected to the main control module and the information processing module, and is used to convert the information received from the first antenna interface forwarded by the information processing module into a format that can be received by the cellular network base station and return it under the control of the main control module to the information processing module; or convert the information received from the third antenna interface forwarded by the information processing module into a format receivable by the broadband wireless air interface of the dual-mode terminal and return it to the information processing module.

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