CN1901733A

CN1901733A - Method for no-damage switching in radio cut-in technology

Info

Publication number: CN1901733A
Application number: CNA2005100850670A
Authority: CN
Inventors: 吴建军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-07-20
Filing date: 2005-07-20
Publication date: 2007-01-24
Anticipated expiration: 2025-07-20
Also published as: CN1901733B

Abstract

This invention relates to a method for carrying out non-loss switch in a radio access technology including: transmitting the MSS data sent to a source NE to a corresponding target NE via the data channel between the source NE and a target NE when switching, and conveying the MSS data messages to said target NE, which transfers the received data messages to the corresponding MSS to ensure the non-loss transmission of service data.

Description

Can't harm the method for switching in the wireless access technology

Technical field

The present invention relates to the communications field, relate in particular to and can't harm the method for switching in a kind of wireless access technology.

Background technology

Extensive use along with the flourish and wireless network of internet service, mobile subscriber's number rapidly increases, thereupon, user's demand also improves rapidly, this requires wireless technology undoubtedly, as GPRS (General Packet Radio Service GPRS), 3G, WiMAX and B3G (Beyond 3G; Back 3G) etc. wireless technology can be supported big capacity, the multiple business that big data quantity and different service quality require.

Wireless access technology is as the bridge between wireless user and existing cable network or other business networks, finishes mainly that the Packet Service that provides between network and the mobile subscriber is transmitted or the function of route.

Be example with as shown in Figure 1 WiMAX network architecture system below, the function of each network element in the WiMAX wireless access system that adopts wireless access technology be described:

In Fig. 1, described WiMAX wireless access system comprises MSS (Mobile Subscribe Station mobile subscriber station), ASN (Access Service Network; Access service network) and CSN (Connectivity Service Network; Connectivity serving network).

Wherein, described MSS is a mobile subscriber terminal equipment, and the user uses this devices accessing WiMAX network.

Wherein, described ASN comprises BS (Base Station; The base station) and ASN-GW (AccessService Network GateWay; Access service network gateway) etc., be used to the WiMAX terminal equipment that the network function set of wireless access service is provided.As, functions such as the compression of being connected of BS and MSS, RRM, measurement and power control, the data of eating dishes without rice or wine and encryption are provided based on described BS; Based on described ASN-GW, for MSS authentication function provides the proxy function, supports the network of NSP to find and select, provide for MSS the functions such as Relay function (as IP address assignment), RRM of L3 information.

Wherein, described CSN is used to the WiMAX terminal that IP is provided Connection Service.As, for MSS distributing IP address, provide Internet to insert, AAA proxy or server are provided, authorization control based on the user is provided, ASN be provided the tunnel to CSN, be equivalent to the tunnel between the CSN, the switching between the different ASN under the HA (home agent) in the mobile IP technology, the charging that WiMAX user is provided and the clearing between the operator, the roaming condition, and various WiMAX service (as location-based business, multi-medium multi-packet broadcasting and broadcasting service, IP Multimedia System business) etc.

The process of transfer of data between each network element is still described in conjunction with Fig. 1 below:

The grouping busihess data message of descending MSS is by HA among the CSN and the Interface R3 between the ASN-GW among the ASN, be sent to the ASN from the HA of CSN, and by the ASN-GW of ASN-GW process ASN inside and the R6 interface between the BS, and the R1 interface between BS and the MSS sends to the MSS data on the MSS.

As seen from Figure 1, along with moving of mobile subscriber, access device between user and the ASN, as the BS among Fig. 1, and (also be core network with this user-dependent access network and business network, as the CSN among Fig. 1) between ASN-GW all might change, switching has just taken place.

Under the situation that ASN-GW changes, may exist some to send to downlink grouped data message on the original ASN-GW, if take these grouped data report are all abandoned this moment, guarantee that by the retransmission mechanism of waiting for the upper strata these grouped data report send to the method for the mobile phone users of MSS by new BS then, then need transmitting terminal mobile subscriber and receiving terminal mobile subscriber to participate in simultaneously and could realize, therefore will cause than higher packet loss and long professional propagation delay time.

In order to reduce packet loss and professional propagation delay time, each wireless system has all been taked the corresponding techniques strategy.

The technical scheme of prior art one related to the present invention:

In ASN-GW, for each BS under the corresponding scope with it formation is set all, be used to store do not have relevant and send or do not receive the business (frame) of affirmation with MSS.When the IntraASN-GW switching takes place when, be that the target BS that switches to of MSS and source BS are in same ASN-GW control range the time, described ASN-GW at first finds the formation of the BS corresponding with it, then that send and that the do not receive affirmation business (frame) relevant with this MSS in it deleted, and, perhaps directly described business (frame) is transferred to the formation of corresponding new BS by on CSN, adopting the harmless transmission of retransmission mechanism assurance end to end professional (frame).

Yet in the switching that Inter ASN-GW takes place, be that the target BS that switches to of MSS and source BS be not in same ASN-GW control range the time, transmission and unacknowledged frame can not shift, therefore, must wait for when the mobile subscriber is in a certain position, rebulid being connected of data surface of new ASN-GW and CSN, then all data messages directly are dealt on the new ASN-GW from CSN, transmit or be routed to the mobile subscriber through new BS at last.

By the technical scheme of above-mentioned prior art one as can be seen:

1, the method that the not transmission in the formation and unacknowledged business (frame) are directly deleted of above-mentioned employing causes packet loss than higher when ASN-GW switches.Even on CSN, adopt retransmission mechanism end to end, also can cause excessive time delay expense, and accordingly for supporting to retransmit system signaling and the data transfer overhead that increases.

2, the method for the formation of described business (frame) being transferred to corresponding new BS of above-mentioned employing, though can guarantee less packet loss, but no matter whether can switch, a formation buffered packet business datum message at each BS all must be set in ASN-GW, therefore this method requires ASN-GW to have bigger memory space when traffic carrying capacity is bigger.

3, prior art one has changed the be connected link of ASN-GW with CSN, has increased the signaling exchange expense between ASN-GW and CSN.

The technical scheme of the prior art two relevant with the present invention:

Pass through ASN-GW, a buffering area is set on each mobile subscriber's Packet Service passage, distribute a unique sequence number corresponding for the grouped data report that sends over from CSN simultaneously, be used to refer to a copy of this data message that is stored at present among the CSN with CSN.

When the mobile subscriber switches, the data message that has received for ASN-GW, if also not by send or also do not receive the affirmation information of bringing in from the user from ASN-GW, then need all the data deletions in the buffering area, perhaps handle according to different situations by source ASN-GW, Intra ASN-GW switches to take place below, Inter ASN-GW switches to the concrete processing procedure of example explanation:

If Intra ASN-GW switches, then ASN-GW does not change, this moment directly from the ASN-GW of source, but pass through the new BS that it manages and send to the mobile subscriber also not sending or sent the downlink business frame that not have to confirm.

If Inter ASN-GW switches, then at first under the situation that is connected link that does not change between ASN and CSN, set up the data channel between a new ASN-GW and the source ASN-GW, then by this newly-built data channel, all data that are stored in the buffering area of source ASN-GW are sent among the new ASN-GW, and last new ASN-GW sends to the mobile subscriber by new BS with described data message.

By the technical scheme of above-mentioned prior art two as can be seen:

1, prior art two need be set up the mechanism that storage is transmitted at the CSN end, therefore will increase the burden of CSN, and under the situation of complete IP network, need CSN some router relevant with ASN to have the memory space of larger capacity, the large user measures to deal with, the requirement of big data quantity.Again the content of Zhuan Faing all needs to send to new ASN-GW from CSN, has increased internetwork flow, has increased network overheads such as signaling and data.

2, prior art two is same exists and prior art one similar problem: spatial cache just must be set up at first in service, up to mobile subscriber's service cancellation or switch among other ASN-GW, therefore requires ASN-GW to have bigger memory space.

3, for sending among the BS but not sending to data on the MSS can only take the method that abandons when switching, so the packet loss of data is than higher.

Summary of the invention

The purpose of this invention is to provide and can't harm the method for switching in a kind of wireless access technology, by the present invention, can guarantee the harmless transmission of business datum, solved in the prior art that the data packet loss compares problem of higher when ASN-GW taking place switching, and behind the employing retransmission mechanism, the time delay that causes is than problem long and system signaling and data transfer overhead increase; Solved and formation or buffer memory must be set in ASN-GW in the prior art and require ASN-GW to have the problem of bigger memory space, and lossless migration process of the present invention is carried out in ASN fully, setting up new R3 does not need the additional functionality of CSN side apparatus, has therefore reduced requirement and dependence to CSN.

The objective of the invention is to be achieved through the following technical solutions:

A kind of method of switching that can't harm in wireless access technology provided by the invention comprises:

A, when switching, by the data channel between source network element and target network element, give corresponding target network element with the MSS data message forwarding that or sends to the source network element, and by the CSN that sets up to the data channel between target network element, send the data message of the MSS that sends to described target network element;

B, described target network element send the data message that receives to corresponding MSS.

Wherein, described steps A specifically comprises:

A1, when switching, by the data channel between source ASN-GW and target ASN-GW, give corresponding target ASN-GW with the MSS data message forwarding that or sends to source ASN-GW, and by the CSN that sets up to the data channel between target ASN-GW, send the data message of the MSS that sends to described target ASN-GW;

Or,

A2, when switching, by the data channel between source BS and target BS, will or send to the MSS data message forwarding of source BS give corresponding target BS, and by the CSN that sets up to the data channel between target BS, send the data message of the MSS that sends to described target BS.

Wherein, described steps A 1 specifically comprises:

A11, in described source ASN-GW, set up buffer, and or sent to the data message of the MSS of source ASN-GW by the buffer buffer memory of described foundation;

A12, when switching, by the data channel between source ASN-GW and described target ASN-GW described data in buffer message is sent to target ASN-GW, and by the CSN that sets up to the data channel between target ASN-GW, send the data message of the MSS that sends to described target ASN-GW.

Wherein, described steps A 2 specifically comprises:

A21, in described source BS, set up buffer, and or sent to the data message of the MSS of source BS by the buffer buffer memory of described foundation;

A22, when switching, by the data channel between source BS and target BS described data in buffer message is sent to target BS, and by the CSN that sets up to the data channel between target BS, send the data message of the MSS that sends to described target BS.

Wherein, described steps A 11 specifically comprises:

A111, according to the qos requirement of business and/or user's grade, static state is set up buffer in described source ASN-GW; Or, when switching,, in described source ASN-GW, dynamically set up buffer according to the qos requirement of business and/or user's grade;

A112, or sent to the data message of the MSS of source ASN-GW by the buffer buffer memory of described foundation.

Wherein, described steps A 21 specifically comprises:

A211, according to the qos requirement of business and/or user's grade, static state is set up buffer in described source BS; Or, when switching,, in described source BS, dynamically set up buffer according to the qos requirement of business and/or user's grade;

A212, or sent to the data message of the MSS of source BS by the buffer buffer memory of described foundation.

Wherein, described when switching in the steps A 111, according to the qos requirement of business and/or user's grade, the process of dynamically setting up buffer in described source ASN-GW or source BS specifically comprises:

A1111, source BS and MSS consult to trigger when switching, and switch message informing source ASN-GW by sending;

A1112, when described source ASN-GW receives described switching message, according to the qos requirement of described business and/or user's grade, in described source ASN-GW, dynamically set up buffer.

Wherein, described when switching in the steps A 211, according to the qos requirement of business and/or user's grade, the process of dynamically setting up buffer in described source BS specifically comprises:

A2111, source BS and MSS consult to trigger and switch;

A2112, when described source BS and MSS consult to finish, according to the qos requirement of described business and/or user's grade, in described source BS, dynamically set up buffer.

Wherein, described steps A 112 specifically comprises:

A1121, described source ASN-GW receive the MSS downlink data message that sends from described CSN;

A1122, preserve the described data message that receives by described buffer.

Wherein, described steps A 212 specifically comprises:

A2121, described source BS receive the MSS downlink data message that sends from described CSN;

A2122, preserve the described data message that receives by described buffer.

Wherein, before described steps A, comprise:

C, according to the situation of utilizing of service dispatching strategy or interface-free resources, buffer memory is by the described source BS data message of giving among the MSS to be sent in the BS of source.

Wherein, described steps A 112 specifically comprises:

A1123, when switching, the MSS data message that the buffer buffer memory of described source ASN-GW by described foundation transmits from CSN, and be discarded among the BS of source the data in buffer message or data in buffer message in the described source BS transmitted back source ASN-GW control according to the respective handling pattern information in the switching message between described source ASN-GW and source BS decision, when selecting to abandon, then notify described source BS to abandon data in buffer message in it, finish this step then; When selecting to transmit, notify described source BS that data in buffer message in it is forwarded among the described source ASN-GW, then execution in step A1124;

A1124, the described source BS data channel by setting up between itself and described source ASN-GW sends to described source ASN-GW with data in buffer message in it;

A1125, described source ASN-GW are kept at the data message that receives in the buffer of described foundation.

Wherein, described steps A 212 specifically comprises:

A2123, when switching, the MSS data message that the buffer buffer memory of described source BS by described foundation transmits from CSN, and according to the handover management information of BS inside data in buffer message or data in buffer message in the described source BS is kept in the buffer of described foundation in decision is discarded among the BS of source, when selecting to abandon, then notify described source BS to abandon data in buffer message in it, finish this step then; When selecting to transmit, notify described source BS that data in buffer message in it is saved in the upright buffer of The built-in, then execution in step A1124;

A1124, described source BS are kept at the data message that receives in the buffer of described foundation.

Wherein, described steps A 12 specifically comprises:

A121, when switching, after source ASN-GW and target ASN-GW consult, CSN sets up described CSN to the data channel target ASN-GW by target ASN-GW notice, and by described newly-built data channel, sends the data message that sends to MSS to described target ASN-GW; Simultaneously, target ASN-GW notification source ASN-GW sets up the data channel of source ASN-GW between the target ASN-GW, and the MSS data message that notification source ASN-GW will send to it sends to target ASN-GW by described data channel;

Or,

A122, when switching, after source ASN-GW or target ASN-GW trigger the data channel of decision change from CSN to source ASN-GW, by the newly-built data channel of described target ASN-GW notice CSN from CSN to target ASN-GW, and, send the data message that sends to MSS to described target ASN-GW by described newly-built data channel; Simultaneously, described source ASN-GW sends to the data message that sends to its MSS among the target ASN-GW by the data channel between described source ASN-GW and target ASN-GW.

Wherein, described steps A 22 specifically comprises:

A221, when switching, after source BS and target BS were consulted, CSN set up described CSN to the data channel target BS by the target BS notice, and by described newly-built data channel, sends the data message that sends to MSS to described target BS; Simultaneously, target BS notification source BS sets up source BS to the data channel between target BS, and the MSS data message that notification source BS will send to it sends to target BS by described data channel;

Or,

A222, when switching, after source BS or target BS trigger the data channel of decision change from CSN to source BS, by the newly-built data channel from CSN to the target BS of described target BS notice CSN, and, send the data message that sends to MSS to described target BS by described newly-built data channel; Simultaneously, described source BS sends to the data message that sends to its MSS in the target BS by the data channel between described source BS and target BS.

Wherein, described step B specifically comprises:

B1, described target ASN-GW receive the MSS downlink data message that sends from described CSN, and the data message that sends over from described source ASN-GW;

B2, described data message is sent to described target BS by the data channel between described target ASN-GW and described target BS;

B3, described target BS send to corresponding MSS with air interface between described MSS with described data message by it;

Or,

B4, described target BS receive the MSS downlink data message that sends from described CSN, and the data message that sends over from described source BS;

B5, with air interface between described MSS the data message of described reception is sent to corresponding MSS by it.

Wherein, described method also comprises:

D, after the data message in the buffer disposes, discharge the buffer among the described source ASN-GW, and the downlink data message of the described MSS that sends from CSN that will receive of the data channel by described foundation sends to corresponding MSS; Or,

E, after the data message in the buffer disposes, discharge the buffer among the described source BS, and the downlink data message of the described MSS that sends from CSN that will receive of the data channel by described foundation sends to corresponding MSS.

Wherein, described step D specifically comprises:

D1, after the data message in the buffer disposes, discharge the buffer among the described source ASN-GW;

D2, from the downlink data message that CSN sends to the described MSS of source ASN-GW, send to target BS by the passage between described target ASN-GW and target BS;

D3, described target BS send among the MSS by the air interface between itself and MSS;

Wherein, described step e specifically comprises:

E1, after the data message in the buffer disposes, discharge the buffer among the described source BS;

E2, from the downlink data message that CSN sends to the described MSS of source BS, send to target BS by the passage between described CSN and target BS;

E3, described target BS send among the MSS by the air interface between itself and MSS.

Wherein, described method also comprises:

F, when the data channel between described CSN and described target ASN-GW set up finish after, start timer, when arriving the setting-up time of described timer, the data channel between source of release ASN-GW and target ASN-GW then; Or,

G, when the data channel between described CSN and described target BS set up finish after, start timer, when arriving the setting-up time of described timer, the data channel between source of release BS and target BS then.

As seen from the above technical solution provided by the invention, method of the present invention is when switching, by the data channel between source network element and target network element, give corresponding target network element with the MSS data message forwarding that or sends to the source network element, and by the CSN that sets up to the data channel between target network element, send the data message of the MSS that sends to described target network element; Described then target network element sends the data message that receives to corresponding MSS.Therefore the present invention can guarantee the harmless transmission of business datum, solved in the prior art that the data packet loss compares problem of higher when ASN-GW taking place switching, and behind the employing retransmission mechanism, the time delay that causes is than problem long and system signaling and data transfer overhead increase; Solved and formation or buffer memory must be set in ASN-GW in the prior art and require ASN-GW to have the problem of bigger memory space, and lossless migration process of the present invention is carried out in ASN fully, setting up new R3 does not need the additional functionality of CSN side apparatus, has therefore reduced requirement and dependence to CSN.

In addition, thus the present invention can be in wireless access network according to the grade of service and the harmless purpose that reach low packet loss ratio and low delay of switching of quality of service requirement support.

Description of drawings

Fig. 1 is a WiMAX network architecture system schematic diagram;

Fig. 2 is the flow chart of first embodiment provided by the invention;

When Fig. 3 switches for Inter ASN-GW takes place, set up the schematic diagram of the new tunnel of data passes;

When Fig. 4 switches for Inter ASN-GW takes place, set up the schematic diagram of the new tunnel of data passes;

Fig. 5 is the flow chart of second embodiment provided by the invention;

Fig. 6 triggers Inter ASN-GW to MSS to switch, and the R4 data channel between source ASN-GW and target ASN-GW is set up failure, the flow chart when triggering the Interface R3 migration between CSN and ASN-GW for a long time;

Fig. 7 after MSS is triggered Inter ASN-GW switching, sets up the R4 passage between target ASN-GW and source ASN-GW earlier, the flow chart when the Interface R3 migration between CSN and ASN-GW takes place again.

Embodiment

The invention provides and can't harm the method for switching in a kind of wireless access technology, its core is: when switching, by the data channel between source network element and target network element, give corresponding target network element with the MSS data message forwarding that or sends to the source network element, and by the CSN that sets up to the data channel between target network element, send the data message of the MSS that sends to described target network element; Described target network element sends the data message that receives to corresponding MSS.

First embodiment provided by the invention as shown in Figure 2, comprising:

Step 101, in described source ASN-GW, set up buffer.

This process specifically comprises two kinds of situations.

One is: according to the qos requirement of business and/or user's grade, static state is set up buffer in described source ASN-GW.

It two is: when ASN-GW taking place switch, according to the qos requirement of business and/or user's grade, dynamically set up buffer in described source ASN-GW.This process specifically comprises:

Step 1, source BS and MSS consult to trigger when switching, and switch message informing source ASN-GW by sending;

Step 2, when described source ASN-GW receives described switching message, according to the qos requirement of described business and/or user's grade, in described source ASN-GW, dynamically set up buffer.

Move to the scope that target BS covers at MSS from source BS, perhaps in the scope that source BS and target BS are covered simultaneously, triggered when switching by MSS or network side; Source ASN-GW will be by for the qos requirement of business and/or user's grade, whether decision needs to adopt buffer mechanism to support the harmless switching of Packet Service, if desired, then dynamically set up a buffer at this MSS in the ASN-GW of source, the downlink data newspaper of this MSS that all tunnels between CSN process CSN and ASN-GW send over will be buffered in the described buffer; Determine the parameter of buffer simultaneously according to qos requirement.

Step 102, send to the downlink data message of MSS by described buffer buffer memory.

Under normal circumstances, source BS sends to the part downlink data message of MSS according to the actual conditions buffer memory.Move to the scope that target BS covers at MSS from source BS, perhaps in the scope that source BS and target BS are covered simultaneously, when having triggered switching by MSS or network side, described source ASN-GW enables buffer mechanism: source ASN-GW no longer sends the downlink data packet of this MSS to source BS, the MSS data message that the buffer buffer memory by described foundation transmits from CSN.

Step 103, in when, ASN-GW taking place switching when, by the CSN that sets up to the data channel between target ASN-GW, send the data message of the MSS that sends to described target ASN-GW, and described data in buffer message is sent to target ASN-GW by the data channel between source ASN-GW and described target ASN-GW.

The process of step 103 specifically comprises following two kinds of situations.

One is: when the ASN-GW switching takes place, after source ASN-GW and target ASN-GW consult, target ASN-GW notice CSN sets up described CSN to the data channel between target ASN-GW, and by described newly-built data channel, sends the data message that sends to MSS to described target ASN-GW; Simultaneously, target ASN-GW notification source ASN-GW sets up source ASN-GW to the data channel between target ASN-GW, and notification source ASN-GW sends to target ASN-GW with the data in buffer message by described data channel.

This process is switched at Inter ASN-GW, at first as shown in Figure 3, target ASN-GW notice CSN sets up CSN to the R3 data channel between the target ASN-GW, and target ASN-GW notification source ASN-GW sets up source ASN-GW to the R4 data channel between target ASN-GW simultaneously;

Then, by described newly-built R3 data channel, send the data message that sends to MSS to described target ASN-GW; By described newly-built R4 data channel, the data message that is buffered among the ASN-GW of source is sent to target ASN-GW.

It two is: when the ASN-GW migration takes place, after source ASN-GW or target ASN-GW trigger the data channel of decision change from CSN to source ASN-GW, by the newly-built data channel of described target ASN-GW notice CSN from CSN to source ASN-GW, and, send the data message that sends to MSS to described target ASN-GW by described newly-built data channel; Simultaneously, described source ASN-GW sends to the data in buffer message among the target ASN-GW by the data channel between described source ASN-GW and target ASN-GW.

This process is at the situation of ASN-GW migration: promptly at as shown in Figure 4, MSS has switched, and set up CSN through source ASN-GW, target ASN-GW and target BS are to the passage of MSS, need to change the R3 passage, make data channel become CSN arrives MSS through target ASN-GW and target BS passage, this situation can be called the ASN-GW migration, when the ASN-GW migration takes place when, after source ASN-GW or target ASN-GW trigger the data channel of decision change from CSN to source ASN-GW, by the newly-built R3 data channel as shown in Figure 4 of described target ASN-GW notice CSN from CSN to source ASN-GW.Keep the R4 data channel between original source ASN-GW and target ASN-GW simultaneously.

Then, by described newly-built R3 data channel, send the data message that sends to MSS to described target ASN-GW; By the R4 data channel of described maintenance, the data message that is buffered among the ASN-GW of source is sent to target ASN-GW.

Step 104, described target ASN-GW send the data message that receives to corresponding MSS.

Described target ASN-GW receives the MSS downlink data message that sends from described CSN, and the data message that sends over from described source ASN-GW; Then described data message is sent to described target BS by the data channel between described target ASN-GW and described target BS; Last described target BS sends to corresponding MSS with air interface between described MSS with described data message by it.

Step 105, after the data message in the buffer disposes, discharge the buffer among the described source ASN-GW and discharge data channel between described source ASN-GW and described target ASN-GW, and the downlink data message of the described MSS that sends from CSN that continues to receive of the data channel by described foundation sends to corresponding MSS.

Described step 105 specifically comprises:

Step 1, after the data message in the buffer disposes, discharge the buffer among the described source ASN-GW;

Step 2, from the downlink data message that CSN sends to the described MSS of source ASN-GW, send to target BS by the passage between described target ASN-GW and target BS;

Step 3, described target BS send among the MSS by the air interface between itself and MSS.

Second embodiment provided by the invention as shown in Figure 5, comprising:

Step 201, according to the situation of utilizing of service dispatching strategy or interface-free resources, buffer memory waits to issue data message among the MSS by described source BS in the BS of source.

Under normal circumstances, the downlink data newspaper of this MSS that sends over by the tunnel between CSN and the ASN-GW from CSN directly is forwarded to source BS by source ASN-GW, send on the MSS through air interface by source BS, because factors such as service dispatching and interface-free resources utilizations, the datagram that sends to this MSS among the BS of source might be by temporary cache.

For example, for the datagram of receiving from network terminal, if temporary transient interface-free resources is limited, the described data message of first buffer memory in the BS of source so just is up to there being certain interface-free resources this datagram can be sent to the MSS of appointment.Perhaps sometimes, datagram for some specific service quality requirement, need in BS, take retransmission mechanism, after these data sent from BS, first buffer memory was up to the affirmation message of the correct reception of receiving this MSS, just data in buffer is deleted, source BS receives the Nack (affirmation failed message) that MSS beams back or any acknowledge message of still not receiving MSS behind certain hour else if, just data in buffer need be retransmitted, up to receiving acknowledge message.

Step 202, in described source ASN-GW, set up buffer.With first embodiment, be not described in detail.

Step 203, send to the downlink data message of MSS by described buffer buffer memory.

The downlink data message that described buffer buffer memory sends to MSS comprises: the downlink data message of the MSS that sends over from described CSN, and the data message that is transmitted to described source ASN-GW from described source BS.

Still be untreated the processing method of data message of this MSS according to corresponding tupe information decision the switching message between source ASN-GW and the source BS for what source BS received from source ASN-GW: abandon the data message among the BS of source or the data message transmitted among the BS of source returns source ASN-GW control.If select to abandon, source BS will directly abandon the datagram of untreated this MSS still that sends from source ASN-GW that receives so; Otherwise passage that will be by source BS and source ASN-GW is transmitted back these datagrams in the buffer among the ASN-GW of source again.

Described step 203 specifically comprises:

Step 1, the MSS data message that the buffer buffer memory of described source ASN-GW by described foundation transmits from CSN, source ASN-GW is according to the QoS quality requirement of the service of the user in the switching message between described source ASN-GW and the source BS, the resource usage degree and/or the user gradation of the data channel between source BS and the source ASN-GW, notification source BS is discarded among the BS of source the data in buffer message or data in buffer message in the described source BS is transmitted back source ASN-GW control, when selecting to abandon, then notify described source BS to abandon data in buffer message in it, finish this step then; When selecting to transmit, notify described source BS that data in buffer message in it is forwarded among the described source ASN-GW, execution in step two then;

Step 2, the described source BS data channel by setting up between itself and described source ASN-GW sends to described source ASN-GW with data in buffer message in it;

Step 3, described source ASN-GW are kept at the data message that receives in the buffer of described foundation.

Step 204, in when, ASN-GW taking place switching when, by the CSN that sets up to the data channel between target ASN-GW, send the data message of the MSS that sends to described target ASN-GW, and described data in buffer message is sent to target ASN-GW by the data channel between source ASN-GW and described target ASN-GW.

The specific implementation process of described step 204 is described here no longer in detail with the associated description among first embodiment.

Step 205, described target ASN-GW send the data message that receives to corresponding MSS.

The specific implementation process of described step 205 is described here no longer in detail with the associated description among first embodiment.

Step 206, after the data message in the buffer disposes, discharge the buffer among the described source ASN-GW and discharge data channel between described source ASN-GW and described target ASN-GW, and the downlink data message of the described MSS that sends from CSN that continues to receive of the data channel by described foundation sends to corresponding MSS.

The specific implementation process of described step 206 is described here no longer in detail with the associated description among first embodiment.

The 3rd embodiment provided by the invention, be with the first embodiment difference, when the tunnel of CSN and ASN is based upon certain equipment among BS (replacing the function of ASN-GW as FA) and the CSN (as HA, the perhaps equipment of identity function) in the time of between, buffer can be placed on above the BS, is equivalent to the harmless function of switching of storage forwarding that BS finishes ASN-GW among part the present invention this moment.

The 3rd embodiment provided by the invention comprises:

Step 301, in described source BS, set up buffer.

This process specifically comprises two kinds of situations.

One is: according to the qos requirement of business and/or user's grade, static state is set up buffer in described source BS.

It two is: when switching, according to the qos requirement of business and/or user's grade, dynamically set up buffer in described source BS.This process specifically comprises:

Step 1, source BS and MSS consult to trigger and switch;

Step 2, when described source BS and MSS consult to finish, according to the qos requirement of described business and/or user's grade, in described source BS, dynamically set up buffer.

Move to the scope that target BS covers at MSS from source BS, perhaps in the scope that source BS and target BS are covered simultaneously, triggered when switching by MSS or network side; Source BS will be by for the qos requirement of business and/or user's grade, whether decision needs to adopt buffer mechanism to support the harmless switching of Packet Service, if desired, then dynamically set up a buffer at this MSS in the BS of source, the downlink data newspaper of this MSS that all tunnels between CSN process CSN and BS send over will be buffered in the described buffer; Determine the parameter of buffer simultaneously according to qos requirement.

Step 302, send to the downlink data message of MSS by described buffer buffer memory.

Under normal circumstances, source BS sends to the part downlink data message of MSS according to the actual conditions buffer memory.Move to the scope that target BS covers at MSS from source BS, perhaps in the scope that source BS and target BS are covered simultaneously, triggered when switching by MSS or network side, described source BS enables buffer mechanism: the MSS data message that the buffer buffer memory by described foundation transmits from CSN.

Step 303, when switching, by the CSN that sets up to the data channel between target BS, send the data message of the MSS that sends to described target BS, and described data in buffer message is sent to target BS by the data channel between source BS and described target BS.

The process of step 303 specifically comprises following two kinds of situations.

One is: when switching, after source BS and target BS were consulted, target BS notice CSN set up described CSN to the data channel between target BS, and by described newly-built data channel, sends the data message that sends to MSS to described target BS; Simultaneously, target BS notification source BS sets up source BS to the data channel between target BS, and notification source BS sends to target BS with the data in buffer message by described data channel.

It two is: when migration takes place, after source BS or target BS trigger the data channel of decision change from CSN to source BS, by the newly-built data channel from CSN to the target BS of described target BS notice CSN, and, send the data message that sends to MSS to described target BS by described newly-built data channel; Simultaneously, described source BS sends to the data in buffer message in the target BS by the data channel between described source BS and target BS.

Step 304, described target BS send the data message that receives to corresponding MSS.

Described target BS receives the MSS downlink data message that sends from described CSN, and the data message that sends over from described source BS; Then with described data message by described target BS with described MSS between air interface described data message is sent to corresponding MSS.

Step 305, after the data message in the buffer disposes, discharge the buffer among the described source BS and discharge data channel between described source BS and described target BS, and the downlink data message of the described MSS that sends from CSN that continues to receive of the data channel by described foundation sends to corresponding MSS.

The 4th embodiment provided by the invention, be with the difference of described second embodiment, when the tunnel of CSN and ASN is based upon certain equipment among BS (replacing the function of ASN-GW as FA) and the CSN (as HA, the perhaps equipment of identity function) in the time of between, buffer can be placed on above the BS, is equivalent to the harmless function of switching of storage forwarding that BS finishes ASN-GW among part the present invention this moment.Its specific implementation process comprises:

Step 401, according to the situation of utilizing of service dispatching strategy or interface-free resources, buffer memory waits to issue data message among the MSS by described source BS in the BS of source.

Under normal circumstances, the downlink data newspaper of this MSS that sends over by the tunnel between CSN and the BS from CSN directly is forwarded to source BS, send on the MSS through air interface by source BS, because factors such as service dispatching and interface-free resources utilizations, the datagram that sends to this MSS among the BS of source might be by temporary cache.

Step 402, in described source BS, set up buffer.Describe with the related content among the 3rd embodiment, be not described in detail.

Step 403, send to the downlink data message of MSS by described buffer buffer memory.

The downlink data message that described buffer buffer memory sends to MSS comprises: the downlink data message of the MSS that sends over from described CSN, and the data message that is uploaded to described source BS from the BS buffer memory of described source.

For the treating method that from the BS buffer memory of described source, is uploaded to the data message of described source BS be:

When switching, the MSS data message that the buffer buffer memory of described source BS by described foundation transmits from CSN, and according to the handover management information of BS inside data in buffer message or data in buffer message in the described source BS is kept in the buffer of described foundation in decision is discarded among the BS of source, when selecting to abandon, then notify described source BS to abandon data in buffer message in it, finish this step then; When selecting to transmit, notify described source BS that data in buffer message in it is saved in it and switch in the buffer of setting up for harmless, described then source BS is kept at the data message that receives in the buffer of described foundation.

Step 404, when switching, by the CSN that sets up to the data channel between target BS, send the data message of the MSS that sends to described target BS, and data in buffer message in the described buffer is sent to target BS by the data channel between source BS and described target BS.

The specific implementation process of described step 404 is described here no longer in detail with the associated description among the 3rd embodiment.

Step 405, described target BS send the data message that receives to corresponding MSS.

Described target BS receives the MSS downlink data message that sends from described CSN, and the data message that sends over from described source BS; Then described data message is sent to corresponding MSS with air interface between described MSS with described data message by described target BS.

Step 406, after the data message in the buffer disposes, discharge the buffer among the described source BS and discharge data channel between described source BS and described target BS, and the downlink data message of the described MSS that sends from CSN that continues to receive to the data channel between target BS of the CSN by described foundation sends to target BS, by the air interface between the target BS set up and described MSS the downlink data message of described MSS sent to corresponding MSS then.

Below in conjunction with Fig. 6, MSS is triggered Inter ASN-GW switch, and the R4 data channel between source ASN-GW and target ASN-GW sets up failure for a long time, trigger the situation that the Interface R3 between CSN and ASN-GW moves and describe.

Under normal circumstances, source BS sends to the part downlink data message of MSS according to the actual conditions buffer memory; When source BS and MSS negotiation triggering switching, by the switching message informing source ASN-GW that sends.

Described source ASN-GW is during according to the data message of corresponding tupe information decision forwarding cache in the switching message between source ASN-GW and source BS in the BS of source, then the R6 passage by setting up between source ASN-GW and source BS notifies described source BS that data in buffer message in it is transmitted back source ASN-GW control.

Described source BS to the passage between the ASN-GW of source, transmits back source ASN-GW with data in buffer message in it by source BS; Simultaneously, the downlink data message that or sends to all MSS of source ASN-GW from the HA of CSN all is saved in the buffer.

The relevant handover information of source ASN-GW and target ASN-GW exchange MSS is set up the R4 passage between target ASN-GW and source ASN-GW, and is set up the R6 passage between target ASN-GW and target BS, sets up the R1 passage of target BS and MSS.

When the R4 passage that can't set up for a long time between target ASN-GW and source ASN-GW, perhaps because resource problem or target ASN-GW trigger when changing CSN to ASN-GW, source ASN-GW/ target ASN-GW decision triggers the Interface R3 migration between CSN and ASN-GW: set up the R3 data channel between the HA of target ASN-GW and CSN, and will send to target ASN-GW from the MSS data message that CSN sends by newly-built R3 passage, by the R4 passage between newly-built target ASN-GW and source ASN-GW, give corresponding target ASN-GW simultaneously with the data message forwarding among the described source ASN-GW.

Then, described target ASN-GW sends to described data message in the target BS by newly-built target ASN-GW and the R6 passage between target BS, is sent among the MSS by the air interface (newly-built R1 data channel) between itself and MSS by target BS at last.

After the data message in the buffer disposes, discharge the buffer among the described ASN-GW, and the R4 passage between newly-built target ASN-GW and source ASN-GW.

The downlink data message of the described MSS that sends from CSN, described data message is sent in the target BS to the R6 passage between target BS by described newly-built source ASN-GW, send among the MSS by the air interface (newly-built R1 data channel) between itself and MSS at last by target BS.

Below in conjunction with Fig. 7, after MSS triggering Inter ASN-GW switching, set up the R4 passage between target ASN-GW and source ASN-GW earlier, the situation that the Interface R3 migration between CSN and ASN-GW takes place again describes.

After source or target ASN-GW trigger the passage of decision this MSS of change from CSN to ASN, then only need the HA among the target ASN-GW notice CSN to send among the target ASN-GW by HA and the passage of setting up between the target ASN-GW, utilize R6 and the R1 passage set up that data are sent on the MSS then all about the downlink data newspaper of this MSS.For the R4 passage, consider to remain before the transmit path that still has the HA of the descending data of part in target ASN-GW notice CSN to change MSS downlink data newspaper to send to source ASN-GW, target ASN-GW notification source ASN-GW continue on Interface R4, to transmit receive the Interface R3 that passes through HA and source ASN-GW that comes data in target ASN-GW.After this close the R4 passage between source ASN-GW and the target ASN-GW.Specific implementation process is as follows:

Step 1, under normal circumstances, the downlink data of MSS is subject to the Interface R3 of crossing between HA and the source ASN-GW, Interface R4 between source ASN-GW and the target ASN-GW, R6 interface between target ASN-GW and the target BS and the R1 interface between target BS and the MSS are to MSS.

In this case, among the described source ASN-GW, buffer can be set, also buffer can be set.Only listed the flow process when buffer not being set among Fig. 7.For the situation that is provided with buffer, identical with associated description in the foregoing description, be not described in detail.

When step 2, source/target ASN-GW determined the triggering R3 relocation, target ASN-GW notice HA set up the new R3 passage from HA to target ASN-GW to this MSS, and closes from HA to source ASN-GW at the R3 passage of this MSS.

Step 3, source ASN-GW are forwarded to target ASN-GW by Interface R4 with the downlink data newspaper of the MSS that receives, (assurance was reported through the downlink data of the MSS of original Interface R3 transmission from HA and was all arrived source ASN-GW, and this time can be the fixed value of an estimated value or a configuration a period of time after target ASN-GW notification source ASN-GW has set up new Interface R3.The present invention controls the time that discharges the R4 passage by starting the timer that is provided with after successfully setting up new Interface R3.)

The downlink data packet of step 4, MSS is through the Interface R3 between HA and the target ASN-GW, and R6 interface between target ASN-GW and the target BS and the R1 interface between target BS and the MSS are to MSS.

As seen from the above technical solution provided by the invention, method of the present invention is when switching, by the data channel between source network element and target network element, give corresponding target network element with the MSS data message forwarding that or sends to the source network element, and by the CSN that sets up to the data channel between target network element, send the data message of the MSS that sends to described target network element; Described target network element sends the data message that receives to corresponding MSS.Therefore the present invention can guarantee the harmless transmission of business datum, solved in the prior art that the data packet loss compares problem of higher when ASN-GW taking place switching, and behind the employing retransmission mechanism, the time delay that causes is than problem long and system signaling and data transfer overhead increase; Solved and formation or buffer memory must be set in ASN-GW in the prior art and require ASN-GW to have the problem of bigger memory space, and lossless migration process of the present invention is carried out in ASN fully, setting up new R3 does not need the additional functionality of CSN side apparatus, has therefore reduced requirement and dependence to CSN.

In addition, the present invention with when service is set up, just distributed spatial cache to compare for Packet Service in the past, the method for dynamically setting up buffer has reduced the requirement for memory space, has improved the utilance of buffer.And, can improve the service feature of low packet loss ratio and low time delay by buffer forwarding lossless switch function.

Can't harm the optimum balance that the method for switching can reach system load and service quality according to the grade of service and quality of service requirement support, be unlikely to because all services are all increased storage forwarding lossless switch function and increase overhead; Also be unlikely to not support effectively harmless switching and can not reach the required service quality of user.

With conventional art the buffer memory forwarding is set in CSN and supports switching to compare,, can reduce requirement on ASN-GW, reduce dependence CSN equipment for CSN device processes ability and memory by the dynamic buffering device is set.To be distributed to the demand pressure of an equipment on a plurality of equipment, thereby reach effect of load balance.And the present invention realizes fairly simple.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims

1, a kind of method of switching that can't harm in wireless access technology is characterized in that, comprising:

2, method according to claim 1 is characterized in that, described steps A specifically comprises:

Or,

3, method according to claim 2 is characterized in that,

Described steps A 1 specifically comprises:

A12, when switching, by the data channel between source ASN-GW and described target ASN-GW described data in buffer message is sent to target ASN-GW, and by the CSN that sets up to the data channel between target ASN-GW, send the data message of the MSS that sends to described target ASN-GW;

Described steps A 2 specifically comprises:

4, method according to claim 3 is characterized in that,

Described steps A 11 specifically comprises:

A112, or sent to the data message of the MSS of source ASN-GW by the buffer buffer memory of described foundation;

Described steps A 21 specifically comprises:

5, method according to claim 4 is characterized in that,

In the steps A 111, described when switching, according to the qos requirement of business and/or user's grade, the process of dynamically setting up buffer in described source ASN-GW or source BS specifically comprises:

A1112, when described source ASN-GW receives described switching message, according to the qos requirement of described business and/or user's grade, in described source ASN-GW, dynamically set up buffer;

In the steps A 211, described when switching, according to the qos requirement of business and/or user's grade, the process of dynamically setting up buffer in described source BS specifically comprises:

A2111, source BS and MSS consult to trigger and switch;

6, method according to claim 3 is characterized in that,

Described steps A 112 specifically comprises:

A1122, preserve the described data message that receives by described buffer;

Described steps A 212 specifically comprises:

A2122, preserve the described data message that receives by described buffer.

7, method according to claim 3 is characterized in that, comprises before described steps A:

8, method according to claim 7 is characterized in that,

Described steps A 112 specifically comprises:

A1125, described source ASN-GW are kept at the data message that receives in the buffer of described foundation;

Described steps A 212 specifically comprises:

9, method according to claim 3 is characterized in that,

Described steps A 12 specifically comprises:

Or,

A122, when switching, after source ASN-GW or target ASN-GW trigger the data channel of decision change from CSN to source ASN-GW, by the newly-built data channel of described target ASN-GW notice CSN from CSN to target ASN-GW, and, send the data message that sends to MSS to described target ASN-GW by described newly-built data channel; Simultaneously, described source ASN-GW sends to the data message that sends to its MSS among the target ASN-GW by the data channel between described source ASN-GW and target ASN-GW;

Described steps A 22 specifically comprises:

Or,

10, according to any described method of claim 1 to 9, it is characterized in that described step B specifically comprises:

Or,

11, method according to claim 10 is characterized in that, also comprises:

12, method according to claim 11 is characterized in that,

Described step D specifically comprises:

Described step e specifically comprises:

13, method according to claim 10 is characterized in that, also comprises: