CN100474830C

CN100474830C - System and method for handover in an IP multimedia mobile network

Info

Publication number: CN100474830C
Application number: CNB2005100924320A
Authority: CN
Inventors: 林久凯
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-08-15
Filing date: 2005-08-15
Publication date: 2009-04-01
Anticipated expiration: 2025-08-15
Also published as: CN1917458A

Abstract

The invention provides a method and a system for switching the connection of a mobile device from a first access point to a second access point in an internet protocol multimedia mobile network. The method comprises the following steps: scanning for available access points in the network; comparing the connection strength of each available access point with a preset limit value; authenticating the access point determined to be above the predetermined threshold; adding the authenticated access points to an association table; comparing the connection strength with the first access point with the preset limit value; if the connection strength with the first access point is lower than the preset limit value, selecting an authenticated access point as the second access point and connecting to the second access point; and removing the first access point from the association table and disconnecting the connection with the first access point.

Description

The system and method that is used for the switching of multimedia mobile network according to Internet protocol

Technical field

The present invention generally is about mobile communication system, more particularly, is the system and method that is used for the switching of Internet protocol (IP) multimedia mobile network about a kind of.

Background technology

In the mobile communication system (for example Internet protocol (IP) multimedia mobile network), when the mobile terminal user and the coverage area of system access spot correlation between when mobile, the continuity of maintenance service and quality are important in the extreme.In instant situation about using, be even more important, for example VoIP, IP video signal, teletype conference and instant text.General understanding is that the connection stand-by period between mobile device can not be above 50 milliseconds; But the technology that is used for wherein exchanging between an access point and another access point at present but needs hundreds of milliseconds.

Be used to provide the prior art systems and the method for switching management to comprise a kind of utilization United States Patent (USP) case the 6th, 160, the system of anchor point (anchor) notion that is disclosed in No. 804, this case name are called " mobile management of multimedia mobile network (Mobility Management for a Multimedia Mobile Network) ".Being anchored point is a network node, and it can be assigned to one and move user's platform and as permanent node, can send package in the centre to this permanent node, till deleted or change.Then, this anchor point just can continue to send these packages to this travelling carriage, where moves in this system and ignore this travelling carriage.Therefore, package can be transferred into one and be anchored point, and then this anchor point just can be sent to these packages this travelling carriage.If a travelling carriage is anchored point with respect to it and has moved one section enough distance, just this system can determine the anchor point of this travelling carriage is changed into a more approaching network node so that optimization package route effect.

Another kind of switching management system then is disclosed in United States Patent (USP) case the 6th, 735, in No. 202, the name of this case is called " the mobile management technology (Mobility ManagementTechniques for Use in an Internet Protocol-Based Multimedia Mobile Network) that is used for multimedia mobile network according to Internet protocol ".Each network node all is furnished with one and is responsible for collecting the switching module of relevent information from adjacent node.The travelling carriage that communicates with this network node also can be by providing the signal strength signal intensity information that is derived from adjacent node to help to transfer decision-making.This switching manager can judge when a travelling carriage should transfer and should be forwarded to which node for the information of its use according to this.

Though these system and methods of prior art provide the switching management, but, still need a kind of system and method that can further shorten the switching that is used for the IP multimedia mobile network that connects the stand-by period.This system and method is contained in and produces at least one virtual associated client in the mobile device, these virtual associated client can set up relevance between this mobile device and at least one access point, and can not connect between this mobile device and access point that these are associated.

Summary of the invention

According to wherein viewpoint of the present invention, the invention provides a kind of multimedia mobile network according to Internet protocol that is used for the connection of one mobile device is forwarded to the method for one second access point from one first access point, this method comprises following step: scan access point available in this network; Make comparisons with a bonding strength this mobile device and a default margin value each available access point; Authentication is higher than the access point of this default margin value through decision; These certified access points are added in the contingency table; To make comparisons with this default margin value with the bonding strength of this first access point; If be lower than this default margin value with the bonding strength of this first access point, then select an authenticated access point as this second access point and be connected to this second access point; And after being connected to second access point, from this contingency table, remove this first access point and disconnect and being connected of first access point.

According to another viewpoint of the present invention, the invention provides a kind of multimedia mobile network according to Internet protocol is forwarded to the connection of a mobile device one second access point from one first access point system that is used for, this system comprises: one is coupled to the mobile device of this first access point, this mobile device comprises memory, transceiver, is coupled to the antenna of transceiver and is coupled to memory and the processor of transceiver, this processor can operate in order to: scan access point available in this network; The bonding strength and a default margin value of each available access point are made comparisons; Authentication is higher than the access point of this default margin value through decision; These certified access points are added in the contingency table; To make comparisons with this default margin value with the bonding strength of this first access point; If be lower than the words of this default margin value and be connected to this second access point with the bonding strength of this first access point, then select an authenticated access point as second access point; And remove this first access point and disconnect and being connected of first access point after being connected to second access point from this contingency table, and this memory can operate to store contingency table.

According to another viewpoint of the present invention, the invention provides a kind of multimedia mobile network according to Internet protocol that is used for the connection of one mobile device is forwarded to the method for one second access point from one first access point, this method comprises following step: scan access point available in this network; Make comparisons with a bonding strength this mobile device and a default margin value each available access point; Authentication is higher than the access point of this default margin value through decision; These certified access points are added in the contingency table; To make comparisons with this default margin value with the bonding strength of this first access point; If be lower than this default margin value with the bonding strength of this first access point, then select an authenticated access point as this second access point; This mobile device is connected to this second access point; And from this contingency table, remove this first access point.

Will more understand these and other characteristics of the present invention, viewpoint and advantage with reference to accompanying drawing, explanation and claim.

Description of drawings

Shown in Figure 1 is a schematic diagram according to mobile communication system of the present invention;

Shown in Figure 2 is a schematic diagram according to a mobile device of the present invention and an access point;

Shown in Figure 3 is a flow chart according to forwarding method of the present invention; And

Shown in Figure 4 is one according to contingency table of the present invention.

[main element symbol description]

100 mobile communication system

102 mobile devices

110 links

120 access points

130 links

200 processors

210 memories

220 transceivers

230 antennas

400 contingency tables

Embodiment

Detailed description hereinafter is to be used for implementing optimal mode of the present invention.This description does not also lie in restriction, and its purpose is only for explaining general principle of the present invention, because scope of the present invention is defined among the claim fully.

The present invention provides a kind of method and system of switching of the IP of being used for multimedia mobile network substantially, and it is contained in and produces at least one virtual associated client in the mobile device.These virtual associated client can set up relevance between this mobile device and at least one access point, and can not connect between this mobile device and access point that these are associated.

With reference to Fig. 1, the mobile communication system with symbol 100 expressions among the figure can comprise at least one mobile device 102, and these mobile devices 102 can be coupled at least one access point 120 by link 110.Access point 120 can be coupled by link 130.Mobile device 102 can comprise radio telephone and other multimedia communication device.Access point 120 can comprise fixed or mobile router, network node and

gateway.Link

110 and 130 is preferably Radio Link.Though only show two mobile devices 102 and two access points 120 among the figure, but, it will be apparent to those skilled in the art that system and method for the present invention also can hold many such mobile devices 102 and access point 120.

As shown in Figure 2, mobile device 102 can comprise a processor 200 with access point 120, and this processor 200 can be coupled to a memory 210 and a transceiver 220.There is a strip antenna 230 can be coupled to transceiver 220.Processor 200 can operate in order to implement according to the present invention wherein these method steps of the forwarding method of a viewpoint.210 of memories can operate in order to stored program instructions, so that implement these method steps and be used to store contingency table as herein described.

Shown in Figure 3 the is a kind of IP of being used for protocol multi-media mobile network is forwarded to the method for second access point that does not link to each other with this mobile device 102 as yet from first access point that links to each other with mobile device 102, represents with symbol 300 among the figure.In step 304, can scan second access point 120 that mobile device 102 can be used.Can decide the availability of second access point 120 by coefficients such as signal strength signal intensity and signal qualities.Can judge whether then that in step 308 the second any access point 120 can use.If without any second access point 120 can use, just this method can be returned step 304 so, otherwise just can in step 310, estimate the bonding strength of second access point 120 that each is available.

If the bonding strength of any second access point 120 is not higher than a default margin value,, carry out a contingency table 400 (Fig. 4) otherwise just can in step 314, circulate just this method can be returned step 304 so.In step 318, can from this contingency table 400, delete second access point 120 that bonding strength is lower than this default margin value.In step 320, can authenticate second access point 120 that bonding strength is higher than this default margin value.Authentication can be included between this mobile device 102 and this second access point 120 and set up a virtual connection.In step 322, each certified second access point 120 can be added these contingency tables 400 and be sent among the virtual associated client of this mobile device 102.

In step 324, can check the bonding strength of first access point 120 of this mobile device 102.In step 328, the bonding strength of this first access point 120 can be made comparisons with this default margin value, if this bonding strength is higher than the words of this default margin value, this method just can be returned step 304 so, otherwise second access point 120 that just can select to have optimum signal intensity and signal quality in step 330 is as related selection, and this mobile device 102 then can be connected to second access point 120 of this association selection.In step 332, can from this contingency table 400, delete this first access point 120.In step 334, can remove this first access point 120 of authentication; And in step 336,400 remove this first access point 120 from contingency table.Then this method just can be returned step 304.

A kind of IP of being used for multimedia mobile network provides the system of switching to comprise to be stored in the program command among the memory 210, so that processor 200 comes manner of execution 300.

Certainly, though will be appreciated that what illustrate previously is preferred embodiment of the present invention, but, not deviating under spirit of the present invention and the category prerequisite, still can make amendment to it.

Claims

1. A method for transferring a connection of a mobile device from a first access point to a second access point in a multimedia mobile network, the method comprising the steps of:

Scan for available access points on this network;

comparing the connection strength of each available access point with the mobile device with a predetermined threshold;

authenticating access points determined to be above the preset threshold;

adding these authenticated access points to an association table;

comparing the connection strength with the first access point with the preset threshold value;

selecting an authenticated access point as the second access point and connecting to the second access point if the connection strength with the first access point is lower than the preset threshold value; and

The first access point is removed from the association table and disconnected from the first access point after connecting to the second access point.

2. The method of claim 1, wherein the multimedia mobile network is an Internet Protocol multimedia mobile network.

3. A system for handing over a connection of a mobile device from a first access point to a second access point in a multimedia mobile network, the system comprising:

a mobile device coupled to the first access point, the mobile device comprising a memory, a transceiver, an antenna coupled to the transceiver, and a processor coupled to the memory and the transceiver,

The processor is operable to: scan for available access points in the network; compare the connection strength of each available access point to a predetermined threshold; authenticate if determined to be above the predetermined threshold access points; these authenticated access points are added to an association table; the connection strength with the first access point is compared with the preset threshold value; if the connection with the first access point If the strength is lower than the preset threshold value, then select an authenticated access point as the second access point and connect to the second access point; and after connecting to the second access point, from the association table removing the first access point and disconnecting from the first access point, and

The memory is operable to store the association table.