CN102572974B - Nondestructive switching method and system for wireless access technology - Google Patents
Nondestructive switching method and system for wireless access technology Download PDFInfo
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Abstract
The invention relates to a nondestructive switching method and a nondestructive switching system for a wireless access technology. The method comprises the following steps of: forwarding a data message which is cached in a source network element and is to be transmitted to a mobile subscriber station (MSS) to a corresponding target network element through a data channel between the source network element and the target network element, and transmitting a data message which is transmitted by a connectivity service network (CSN) and is to be transmitted to the MSS to the target network element through a data channel which is established between the CSN and the target network element. Nondestructive switching can be supported according to a service level and quality of service in a wireless access network, the aims of low packet loss rate and short delay are fulfilled, and the transmission of service data is ensured.
Description
Technical field
The present invention relates to the communications field, relate in particular to the method and system that can't harm switching in a kind of wireless access technology.
Background technology
Along with the extensive use of 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; Rear 3G) etc. wireless technology, can support large 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, mainly completes that the Packet Service providing between network and mobile subscriber forwards or the function of route.
Take WiMAX network architecture system as shown in Figure 1 as example, the function of each network element in the WiMAX wireless access system that adopts wireless access technology is described below:
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 mobile subscriber terminal equipment, and user uses this devices accessing WiMAX network.
Wherein, described ASN comprises BS (Base Station; Base station) and ASN-GW (Access Service Network GateWay; Access service network gateway) etc., be used to WiMAX terminal equipment that the network function set of wireless access service is provided.As, based on described BS, provide the functions such as the compression of connection, RRM, measurement and the power control of BS and MSS, the data of eating dishes without rice or wine and encryption; Based on described ASN-GW, for MSS authentication，authorization，accounting function provides proxy function, supports the Network finding of NSP and selection, provides the function such as Relay function (as IP address assignment), RRM of L3 information for MSS.
Wherein, described CSN is used to WiMAX terminal that IP Connection Service is provided.As, for MSS distributing IP address, Internet access is provided, AAA proxy or server are provided, authorization control based on user is provided, the tunnel of ASN to CSN is provided, be equivalent to HA (home agent) in mobile IP technology, clearing between WiMAX user's charging and operator be provided, the tunnel under roaming condition between CSN, the switching between different ASN, 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 the HA in CSN and the Interface R3 between the ASN-GW in ASN, from the HA of CSN, be sent to ASN, and by the R6 interface between ASN-GW process ASN-GW and the BS of ASN inside, and the R1 interface between BS and MSS sends to MSS data on MSS.
As seen from Figure 1, along with mobile subscriber's movement, access device between user and ASN, as the BS in Fig. 1, and (be also core network with this user-dependent access network and business network, as the CSN in Fig. 1) between ASN-GW all likely change, namely there is switching.
In the situation that ASN-GW changes, may exist some to send to the downlink grouped data message on original ASN-GW, if now taked, these grouped data report are all abandoned, then by the retransmission mechanism of waiting for upper strata, guarantee that these grouped data report send to the method for the mobile phone users of MSS by new BS, need transmitting terminal mobile subscriber and receiving terminal mobile subscriber to participate in realizing simultaneously, therefore will cause higher packet loss and long business propagation delay time.
In order to reduce the propagation delay time of packet loss and business, each wireless system has all been taked corresponding technical tactic.
The technical scheme of prior art one related to the present invention:
In ASN-GW, for the each BS under scope corresponding to it, queue is set, for storing do not have relevant with MSS, send or do not receive the business (frame) of confirmation.When there is Intra ASN-GW switching, be that the target BS that is switched to of MSS and source BS are in same ASN-GW control range time, first described ASN-GW finds the queue of the BS corresponding with it, then that do not send and that the do not receive confirmation business (frame) relevant with this MSS in it deleted, and by adopting retransmission mechanism end to end to guarantee the harmless transmission of business (frame), or directly described business (frame) is transferred to the queue of corresponding new BS on CSN.
But when there is the switching of Inter ASN-GW, be that the target BS that is switched to of MSS and source BS be not in same ASN-GW control range time, transmission and unacknowledged frame can not shift, therefore, must wait for that mobile subscriber is when a certain position, re-establish the connection of the data surface of new ASN-GW and CSN, then all data messages are directly dealt into new ASN-GW from CSN, finally by excessively new BS, forward or be routed to mobile subscriber.
Technical scheme by above-mentioned prior art one can be found out:
1, the method that the not transmission in queue and unacknowledged business (frame) are directly deleted of above-mentioned employing causes packet loss higher when ASN-GW switches.Even if adopt retransmission mechanism end to end on CSN, also can cause excessive time delay expense, and accordingly for supporting to retransmit the system signaling and the data transfer overhead that increase.
2, the method for the queue of described business (frame) being transferred to corresponding new BS of above-mentioned employing, although can guarantee less packet loss, but no matter whether can switch, a queue buffered packet business datum message for each BS all must be set in ASN-GW, therefore this method, when traffic carrying capacity is larger, requires ASN-GW to have larger memory space.
3, prior art one has changed the connecting link of ASN-GW and 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, for the grouped data report sending over from CSN, distribute a unique sequence number corresponding with CSN simultaneously, be used to refer to a copy of this data message being stored at present in CSN.
When mobile subscriber switches, the data message having received for ASN-GW, if also not by send or also do not receive the confirmation information of bringing in from user from ASN-GW, need all data in buffering area to delete, or by source ASN-GW, according to different situations, process, to occur, Intra ASN-GW switches below, Inter ASN-GW switches to the concrete processing procedure of example explanation:
If Intra ASN-GW switches, ASN-GW does not change, and now directly from the ASN-GW of source, but sends to mobile subscriber by also not sending or sent the new BS that the downlink business frame do not confirmed manages through it.
If Inter ASN-GW switches, first in the case of not changing the connecting link between ASN and CSN, set up the data channel between a new ASN-GW and source ASN-GW, then by this newly-built data channel, data in all buffering areas that are stored in source ASN-GW are sent in new ASN-GW, and last new ASN-GW sends to mobile subscriber by new BS by described data message.
Technical scheme by above-mentioned prior art two can be found out:
1, prior art two need to be set up at CSN end the mechanism of storage forwarding, therefore will increase the burden of CSN, and the in the situation that of complete IP network, need some router that CSN is relevant to ASN to there is the memory space of larger capacity, to deal with the requirement of large user's amount, big data quantity.Again the content forwarding all need to send to new ASN-GW from CSN, has increased internetwork flow, has increased the network overheads such as signaling and data.
2, prior art two is same exists with prior art once similar problem: spatial cache must be set up at first in service, until therefore mobile subscriber's service cancellation or be switched in other ASN-GW requires ASN-GW to have larger memory space.
3, for sending to the data that still do not send on MSS in BS, can only take the method abandoning when switching, therefore the packet loss of data is higher.
Summary of the invention
The object of this invention is to provide in a kind of wireless access technology and can't harm the method and system of switching, by the present invention, realized low packet loss ratio and low delay, guarantee the transmission of business datum.
The object 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 that one aspect of the present invention provides, comprising:
When switching, by the data channel between source network element and target network element, by be buffered in source network element to be sent give mobile subscriber station MSS data message forwarding give corresponding target network element, and the connectivity serving network CSN that passes through to set up is to the data channel between target network element, sends the data message that sends to MSS transmitting from CSN to described target network element.
The present invention provides a kind of method of switching that can't harm in wireless access technology on the other hand, comprising:
When switching, target network element is by the data channel between source network element and target network element, reception is buffered in the data message to mobile subscriber station MSS to be sent of source network element, and the connectivity serving network CSN that passes through to set up is to the data channel between target network element, receives the data message that sends to MSS transmitting from CSN.
The present invention provides a kind of system of switching that can't harm in wireless access technology on the other hand, comprising:
Source network element, when switching, for by the data channel between source network element and target network element, by the data message forwarding to mobile subscriber station MSS to be sent that is buffered in source network element to corresponding target network element;
CSN, to the data channel between target network element, sends the data message that sends to MSS transmitting from CSN to described target network element for the connectivity serving network CSN by setting up.
The present invention provides a kind of device switching that can't harm in wireless access technology on the other hand, comprising:
When switching, by the data channel between source network element and target network element, receive the module of the data message to mobile subscriber station MSS to be sent that is buffered in source network element; With
By the connectivity serving network CSN that sets up, to the data channel between target network element, receive the module of the data message that sends to MSS that transmits from CSN.
By said method and system, the present invention can can't harm and switch according to the grade of service and quality of service requirement support in wireless access network, and reaches the object of low packet loss ratio and low delay, has guaranteed the transmission of business datum.
Accompanying drawing explanation
Fig. 1 is WiMAX network architecture system schematic diagram;
Fig. 2 is the flow chart of the first embodiment provided by the invention;
When Fig. 3 switches for there is Inter ASN-GW, set up the schematic diagram of the new tunnel of data transmission;
When Fig. 4 switches for there is Inter ASN-GW, set up the schematic diagram of the new tunnel of data transmission;
Fig. 5 is the flow chart of the 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 while triggering the Interface R3 migration between CSN and ASN-GW for a long time;
Fig. 7, after MSS is triggered Inter ASN-GW and switched, first sets up the R4 passage between target ASN-GW and source ASN-GW, then the flow chart when Interface R3 between CSN and ASN-GW occurring moving.
Embodiment
The embodiment of the present invention provides a kind of method that can't harm switching in wireless access technology, when switching, by the data channel between source network element and target network element, by be buffered in source network element to be sent give mobile subscriber station MSS data message forwarding give corresponding target network element, and the connectivity serving network CSN that passes through to set up is to the data channel between target network element, sends the data message that sends to MSS transmitting from CSN to described target network element; Further, described target network element can MSS corresponding to the data message receiving send to.
The first embodiment provided by the invention, as shown in Figure 2, comprising:
This process specifically comprises two kinds of situations.
One is: according to the qos requirement of business and/or user's grade, and quiescent state establishment buffer in described source ASN-GW.
It two is: when there is ASN-GW and switch, and according to the qos requirement of business and/or user's grade, Dynamic Establishing buffer in described source ASN-GW.This process specifically comprises:
Step 1, source BS and MSS consult to trigger while switching, and by transmission, switch message informing source ASN-GW;
Step 2, when described source ASN-GW receives described switching message, according to the qos requirement of described business and/or user's grade, Dynamic Establishing buffer in described source ASN-GW.
At MSS, from source BS, move to the scope that target BS covers, or in the scope covering in source BS and target BS, by MSS or network side, triggered when switching simultaneously; Source ASN-GW will pass through for the qos requirement of business and/or user's grade, whether determine needs to adopt buffer mechanism to support the harmless switching of Packet Service, if needed, in the ASN-GW of source, dynamically set up a buffer for this MSS, the downlink data report of all these MSS that send over through the tunnel between CSN and ASN-GW from CSN will be buffered in described buffer; According to qos requirement, determine the parameter of buffer simultaneously.
Under normal circumstances, source BS sends to the part downlink data message of MSS according to actual conditions buffer memory.At MSS, from source BS, move to the scope that target BS covers, or in the scope covering in source BS and target BS 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 transmitting from CSN by the buffer buffer memory of described foundation.
The process of step 103 specifically comprises following two kinds of situations.
One is: when there is ASN-GW switching, 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; Meanwhile, 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 by the data message of buffer memory by described data channel.
This process is switched for Inter ASN-GW, first as shown in Figure 3, target ASN-GW notice CSN sets up CSN to the R3 data channel between 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 being buffered in the ASN-GW of source is sent to target ASN-GW.
It two is: when there is ASN-GW migration, source ASN-GW or target ASN-GW trigger and determine to change the data channel from CSN to source ASN-GW, by the newly-built data channel from CSN to source ASN-GW of described target ASN-GW notice CSN, and by described newly-built data channel, send the data message that sends to MSS to described target ASN-GW; Meanwhile, described source ASN-GW, by the data channel between described source ASN-GW and target ASN-GW, sends to the data message of buffer memory in target ASN-GW.
This process is for the situation of ASN-GW migration: for 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 R3 passage, make data channel become CSN through target ASN-GW and target BS the passage to MSS, this situation can be called ASN-GW migration, when there is ASN-GW migration, source ASN-GW or target ASN-GW trigger and determine to change the data channel from CSN to source ASN-GW, by the newly-built R3 data channel from CSN to source ASN-GW as shown in Figure 4 of described target ASN-GW notice CSN.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 being buffered in the ASN-GW of source is sent to target ASN-GW.
Described target ASN-GW receives the MSS downlink data message sending from described CSN, and the data message sending 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 the air interface between described MSS by described data message by it.
Described step 105 specifically comprises:
Step 1, after the data message in buffer is disposed, discharge the buffer in described source ASN-GW;
Step 2, from CSN, send to the downlink data message of the described MSS of source ASN-GW, by the passage between described target ASN-GW and target BS, send to target BS;
Step 3, described target BS send in MSS by the air interface between itself and MSS.
The second embodiment provided by the invention, as shown in Figure 5, comprising:
Under normal circumstances, the downlink data report of this MSS sending over by the tunnel between CSN and ASN-GW from CSN is directly forwarded to source BS by source ASN-GW, by source BS, through air interface, send on MSS, due to factors such as business scheduling and interface-free resources utilizations, send to the datagram of this MSS in the BS of source likely by temporary cache.
For example, for the datagram of receiving from network terminal, if temporary transient interface-free resources is limited, so just data message described in first buffer memory in the BS of source, until there is certain interface-free resources this datagram can be sent to the MSS of appointment.Or sometimes, for the datagram of some specific quality of service requirement, need in BS, take retransmission mechanism, after these data send from BS, first buffer memory, until receive the acknowledge message of the correct reception of this MSS, just the data of buffer memory are deleted, source BS receives the Nack (confirmation failed message) that MSS beams back or any acknowledge message of still not receiving MSS after certain hour else if, just need to be by the data re-transmitting of buffer memory, until receive acknowledge message.
Described buffer buffer memory sends to the downlink data message of MSS to comprise: the downlink data message of the MSS sending over from described CSN, and from described source BS, be transmitted to the data message of described source ASN-GW.
The processing method of not yet processing the data message of this MSS from source ASN-GW of receiving for source BS determines according to corresponding tupe information the switching message between source ASN-GW and source BS: abandon the data message in the BS of source or forward data message in the BS of source and return source ASN-GW and control.If select to abandon, source BS will directly abandon the datagram of still untreated this MSS sending from source ASN-GW receiving so; Otherwise will these datagrams be forwarded back in the buffer in the ASN-GW of source again by the passage of source BS and source ASN-GW.
Described step 203 specifically comprises:
Step 1, the MSS data message that described source ASN-GW transmits from CSN by the buffer buffer memory of described foundation, source ASN-GW is according to the QoS quality requirement of the user's service in the switching message between described source ASN-GW and source BS, resource usage degree and/or the user gradation of the data channel between source BS and source ASN-GW, notification source BS is discarded in the data message of buffer memory in the BS of source or the data message forwarding of buffer memory in described source BS is returned to source ASN-GW and control, when selecting to abandon, notify described source BS to abandon the data message of buffer memory in it, then finish this step, when select forward time, notify described source BS by the data message forwarding of buffer memory in it in described source ASN-GW, then perform step two,
Step 2, described source BS, by the data channel of setting up between itself and described source ASN-GW, send to described source ASN-GW by the data message of buffer memory in it;
Step 3, described source ASN-GW are kept at the data message receiving in the buffer of described foundation.
The specific implementation process of described step 204, with the associated description in the first embodiment, is described here no longer in detail.
Described target ASN-GW receives the MSS downlink data message sending from described CSN, and the data message sending 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 the air interface between described MSS by described data message by it.
The specific implementation process of described step 205, with the associated description in the first embodiment, is described here no longer in detail.
The specific implementation process of described step 206, with the associated description in the first embodiment, is described here no longer in detail.
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 in BS (replacing ASN-GW as the function of FA) and CSN (as HA, or the equipment of identity function) between time, buffer can be placed on above BS, is now equivalent to BS and completes the harmless function of switching of storage forwarding of ASN-GW in part the present invention.
The 3rd embodiment provided by the invention, comprising:
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, and quiescent state establishment buffer in described source BS.
It two is: when switching, and according to the qos requirement of business and/or user's grade, Dynamic Establishing 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 complete, according to the qos requirement of described business and/or user's grade, Dynamic Establishing buffer in described source BS.
At MSS, from source BS, move to the scope that target BS covers, or in the scope covering in source BS and target BS, by MSS or network side, triggered when switching simultaneously; Source BS will pass through for the qos requirement of business and/or user's grade, whether determine needs to adopt buffer mechanism to support the harmless switching of Packet Service, if needed, in the BS of source, dynamically set up a buffer for this MSS, the downlink data report of all these MSS that send over through the tunnel between CSN and BS from CSN will be buffered in described buffer; According to qos requirement, determine the parameter of buffer simultaneously.
Step 302, by described buffer buffer memory, send to the downlink data message of MSS.
Under normal circumstances, source BS sends to the part downlink data message of MSS according to actual conditions buffer memory.At MSS, from source BS, move to the scope that target BS covers, or in the scope covering in source BS and target BS simultaneously, when having triggered switching by MSS or network side, described source BS enables buffer mechanism: the MSS data message transmitting from CSN by the buffer buffer memory of described foundation.
Step 303, when switching, by set up CSN to the data channel between target BS, send the data message of the MSS of transmission to described target BS, and by the data channel between source BS and described target BS, the data message of described buffer memory is sent to target BS.
The process of step 303 specifically comprises following two kinds of situations.
One is: when switching, after source BS and target BS are consulted, target BS notice CSN sets 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; Meanwhile, target BS notification source BS sets up source BS to the data channel between target BS, and notification source BS sends to target BS by the data message of buffer memory by described data channel.
It two is: when there is migration, source BS or target BS trigger and determine to change the data channel from CSN to source BS, by the newly-built data channel from CSN to target BS of described target BS notice CSN, and by described newly-built data channel, send the data message that sends to MSS to described target BS; Meanwhile, described source BS, by the data channel between described source BS and target BS, sends to the data message of buffer memory in target BS.
Step 304, described target BS MSS corresponding to the data message receiving send to.
Described target BS receives the MSS downlink data message sending from described CSN, and the data message sending over from described source BS; Then by 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 buffer is disposed, discharge the buffer in described source BS and discharge the data channel between described source BS and described target BS, and continue the downlink data message of the described MSS sending from CSN receiving to send to corresponding MSS by the data channel of described foundation.
The 4th embodiment provided by the invention, be with the difference of described the second embodiment, when the tunnel of CSN and ASN is based upon certain equipment in BS (replacing ASN-GW as the function of FA) and CSN (as HA, or the equipment of identity function) between time, buffer can be placed on above BS, is now equivalent to BS and completes the harmless function of switching of storage forwarding of ASN-GW in part the present invention.Its specific implementation process comprises:
Step 401, according to the situation of utilizing of business scheduling strategy or interface-free resources, in the BS of source, buffer memory is by the data message in described source BS MSS to be issued.
Under normal circumstances, the downlink data report of this MSS sending over by the tunnel between CSN and BS from CSN is directly forwarded to source BS, by source BS, through air interface, send on MSS, due to factors such as business scheduling and interface-free resources utilizations, send to the datagram of this MSS in the BS of source likely by temporary cache.
For example, for the datagram of receiving from network terminal, if temporary transient interface-free resources is limited, so just data message described in first buffer memory in the BS of source, until there is certain interface-free resources this datagram can be sent to the MSS of appointment.Or sometimes, for the datagram of some specific quality of service requirement, need in BS, take retransmission mechanism, after these data send from BS, first buffer memory, until receive the acknowledge message of the correct reception of this MSS, just the data of buffer memory are deleted, source BS receives the Nack (confirmation failed message) that MSS beams back or any acknowledge message of still not receiving MSS after certain hour else if, just need to be by the data re-transmitting of buffer memory, until receive acknowledge message.
Step 402, in described source BS, set up buffer.With the related content in the 3rd embodiment, describe, be not described in detail.
Step 403, by described buffer buffer memory, send to the downlink data message of MSS.
Described buffer buffer memory sends to the downlink data message of MSS to comprise: the downlink data message of the MSS sending over from described CSN, and from the BS buffer memory of described source, be uploaded to the data message of described source BS.
For the treating method that is uploaded to the data message of described source BS from the BS buffer memory of described source, be:
When switching, the MSS data message that described source BS transmits from CSN by the buffer buffer memory of described foundation, and determine be discarded in the data message of interior buffer memory in the BS of source or the data message of buffer memory in described source BS is kept in the buffer of described foundation according to the handover management information of BS inside, when selecting to abandon, notify described source BS to abandon the data message of buffer memory in it, then finish this step; When selecting to forward, notify described source BS that the data message of buffer memory in it is saved in it and is switched in the buffer of setting up for harmless, then described source BS is kept at the data message receiving in the buffer of described foundation.
Step 404, when switching, by set up CSN to the data channel between target BS, send the data message of the MSS of transmission to described target BS, and by the data channel between source BS and described target BS, the data message of buffer memory in described buffer is sent to target BS.
The specific implementation process of described step 404, with the associated description in the 3rd embodiment, is described here no longer in detail.
Step 405, described target BS MSS corresponding to the data message receiving send to.
Described target BS receives the MSS downlink data message sending from described CSN, and the data message sending over from described source BS; Then described data message is sent to corresponding MSS with the air interface between described MSS by described data message by described target BS.
Step 406, after the data message in buffer is disposed, discharge the buffer in described source BS and discharge the data channel between described source BS and described target BS, and continue the downlink data message of the described MSS sending from CSN receiving to send to target BS to the data channel between target BS by the CSN of described foundation, then by the target BS of setting up, with the air interface between described MSS, the downlink data message of described MSS is sent to corresponding MSS.
Below in conjunction with Fig. 6, MSS is triggered to Inter ASN-GW and 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 actual conditions buffer memory; When source BS and MSS negotiation triggering switching, by the switching message informing source ASN-GW sending.
When described source ASN-GW determines the data message of forwarding cache in the BS of source according to corresponding tupe information in the switching message between source ASN-GW and source BS,, by the R6 passage of setting up between source ASN-GW and source BS, notify described source BS that the data message forwarding of buffer memory in it is returned to source ASN-GW and control.
Described source BS, by the passage between the ASN-GW of BSDao source, source, returns the data message forwarding of buffer memory in it to source ASN-GW; Meanwhile, from the HA of CSN, or send to the downlink data message of all MSS of source ASN-GW to be all saved in buffer.
The relevant handover information of source ASN-GW and target ASN-GW exchange MSS, sets up the R4 passage between target ASN-GW and source ASN-GW, and sets 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 cannot set up for a long time between target ASN-GW and source ASN-GW, or because resource problem or target ASN-GW trigger while changing CSN to ASN-GW, source ASN-GW/ target ASN-GW determines to trigger 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 by newly-built R3 passage, the MSS data message sending from CSN is sent to target ASN-GW, by the R4 passage between newly-built target ASN-GW and source ASN-GW, by the data message forwarding in described source ASN-GW, give corresponding target ASN-GW simultaneously.
Then, described target ASN-GW sends to described data message in target BS by the R6 passage between newly-built target ASN-GW and target BS, finally by target BS, by the air interface (newly-built R1 data channel) between itself and MSS, is sent in MSS.
After the data message in buffer is disposed, discharge the buffer in 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 sending from CSN, by described newly-built source ASN-GW, to the R6 passage between target BS, described data message is sent in target BS, finally by target BS, by the air interface (newly-built R1 data channel) between itself and MSS, sent in MSS.。
Below in conjunction with Fig. 7, after MSS is triggered Inter ASN-GW and switched, first set up the R4 passage between target ASN-GW and source ASN-GW, then the situation that the Interface R3 between CSN and ASN-GW moves occurs describe.
Source or target ASN-GW trigger and determine to change after the passage of this MSS from CSN to ASN, only need the HA in target ASN-GW notice CSN that the downlink data report of all about this MSS is sent in target ASN-GW by the passage between the HA and the target ASN-GW that set up, then utilize R6 and the R1 passage set up that data are sent on MSS.For 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 report to send to source ASN-GW, target ASN-GW notification source ASN-GW continues to forward on Interface R4 the data that receive the Interface R3 that passes through HA and source ASN-GW coming in target ASN-GW.After this close the R4 passage between source ASN-GW and 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 source ASN-GW, Interface R4 between source ASN-GW and target ASN-GW, the R1 interface between R6 interface and target BS and MSS between target ASN-GW and target BS is to MSS.
In this case, in described source ASN-GW, buffer can be set, buffer also can be set.In Fig. 7, only listed the flow process while buffer not being set.For the situation that is provided with buffer, identical with the associated description in above-described embodiment, be not described in detail.
When step 2, source/target ASN-GW determine to trigger R3 relocation, target ASN-GW notice HA sets up the new R3 passage from HA to target ASN-GW to this MSS, and closes the R3 passage for this MSS from HA to source ASN-GW.
Step 3, source ASN-GW are forwarded to target ASN-GW by Interface R4 by the downlink data report of the MSS receiving, until target ASN-GW notification source ASN-GW has set up later a period of time of new Interface R3, (the downlink data report that guarantees the MSS sending through original Interface R3 from HA has all arrived source ASN-GW, and this time can be the fixed value of an estimated value or a configuration.The present invention is successfully setting up after new Interface R3, and the timer arranging by startup is controlled the time that discharges R4 passage.)
The downlink data packet of step 4, MSS is through the Interface R3 between HA and target ASN-GW, and the R1 interface between R6 interface and target BS and MSS between target ASN-GW and target BS is 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, to or send to the MSS data message forwarding of source network element to corresponding target network element, and the CSN that passes through to set up is to the data channel between target network element, sends the data message of the MSS of transmission to described target network element; Described target network element MSS corresponding to the data message receiving sends to.Therefore the present invention can guarantee the harmless transmission of business datum, solved in prior art the higher problem of data packet loss when ASN-GW occurring switching, and after employing retransmission mechanism, the problem that the long and system signaling of the time delay causing and data transfer overhead increase; Solved and queue or buffer memory must be set in prior art in ASN-GW and require ASN-GW to there is the problem of larger memory space, and lossless migration process of the present invention is carried out completely in ASN, 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 compared with just distributing spatial cache in the past when service is set up for Packet Service, and the method for Dynamic Establishing buffer has reduced the requirement for memory space, has improved the utilance of buffer.And forward lossless switch function by buffer, can improve the service feature of low packet loss ratio and low time delay.
The optimum balance that can reach system load and service quality according to the method for the grade of service and the harmless switching of quality of service requirement support, is 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.
Arrange in CSN with conventional art compared with Buffer forwarding support switching, by dynamic buffering device is set on ASN-GW, can reduce the requirement for CSN device processes ability and memory, reduce the dependence to CSN equipment.To the demand pressure of an equipment be distributed on multiple equipment, thereby reach the effect of load balancing.And the present invention realizes fairly simple.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in 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 (11)
1. in wireless access technology, can't harm a method of switching, it is characterized in that, comprising:
A, when switching, by the data channel between source network element and target network element, by be buffered in source network element to be sent give mobile subscriber station MSS data message forwarding give corresponding target network element, and the connectivity serving network CSN that passes through to set up is to the data channel between target network element, sends the data message that sends to MSS transmitting from CSN to described target network element;
Described steps A specifically comprises:
A1, when switching, by the data channel between source access service network gateway ASN-GW and target ASN-GW, by be buffered in source ASN-GW to be sent give MSS data message forwarding give corresponding target ASN-GW, and arrive the data channel between target ASN-GW by the CSN setting up, send the data message that sends to MSS transmitting from CSN to described target ASN-GW;
Or,
A2, when switching, by the data channel between source base station BS and target BS, by be buffered in source BS to be sent give MSS data message forwarding give corresponding target BS, and the CSN that passes through to set up is to the data channel between target BS, sends the data message that sends to MSS transmitting from CSN to described target BS.
2. method according to claim 1, is characterized in that,
Described steps A 1 specifically comprises:
A11, in described source ASN-GW, set up buffer, and by the buffer buffer memory of described foundation, send to the data message to MSS to be sent of source ASN-GW;
A12, when switching, by the data channel between source ASN-GW and described target ASN-GW, the data message of described buffer memory is sent to target ASN-GW, and arrive the data channel between target ASN-GW by the CSN setting up, send the data message that sends to MSS transmitting from CSN to described target ASN-GW;
Described steps A 2 specifically comprises:
A21, in described source BS, set up buffer, and by the buffer buffer memory of described foundation, send to the data message to MSS to be sent of source BS;
A22, when switching, by the data channel between source BS and target BS, the data message of described buffer memory is sent to target BS, and the CSN that passes through to set up is to the data channel between target BS, sends the data message that sends to MSS transmitting from CSN to described target BS.
3. method according to claim 2, is characterized in that,
Described steps A 11 specifically comprises:
A111, according to the qos requirement of business and/or user's grade, quiescent state establishment buffer in described source ASN-GW; Or, when switching, according to the qos requirement of business and/or user's grade, Dynamic Establishing buffer in described source ASN-GW;
A112, by the buffer buffer memory of described foundation, send to that source ASN-GW's is to be sent to the data message of MSS;
Described steps A 21 specifically comprises:
A211, according to the qos requirement of business and/or user's grade, quiescent state establishment buffer in described source BS; Or, when switching, according to the qos requirement of business and/or user's grade, Dynamic Establishing buffer in described source BS;
A212, by the buffer buffer memory of described foundation, send to that source BS's is to be sent to the data message of MSS.
4. method according to claim 3, is characterized in that,
In steps A 111, described when switching, according to the qos requirement of business and/or user's grade, in described source ASN-GW or source BS, the process of Dynamic Establishing buffer specifically comprises:
A1111, source BS and MSS consult to trigger while switching, and by transmission, switch message informing source ASN-GW;
A1112, when described source ASN-GW receives described switching message, according to the qos requirement of described business and/or user's grade, Dynamic Establishing buffer in described source ASN-GW;
In steps A 211, described when switching, according to the qos requirement of business and/or user's grade, in described source BS, the process of Dynamic Establishing buffer specifically comprises:
A2111, source BS and MSS consult to trigger and switch;
A2112, when described source BS and MSS consult complete, according to the qos requirement of described business and/or user's grade, Dynamic Establishing buffer in described source BS.
5. method according to claim 3, is characterized in that,
Described steps A 112 specifically comprises:
A1121, described source ASN-GW receive the MSS downlink data message sending from described CSN;
A1122, the downlink data message receiving described in preserving by described buffer;
Described steps A 212 specifically comprises:
A2121, described source BS receive the MSS downlink data message sending from described CSN;
A2122, the downlink data message receiving described in preserving by described buffer.
6. method according to claim 3, is characterized in that, before described steps A, comprises:
C, according to the situation of utilizing of business scheduling strategy or interface-free resources, in the BS of source, buffer memory is by the described source BS data message of MSS given to be sent.
7. method according to claim 6, is characterized in that,
Described steps A 112 specifically comprises:
A1123, when switching, the data message of giving MSS to be sent that described source ASN-GW transmits from CSN by the buffer buffer memory of described foundation, and determine to be discarded in the data message of buffer memory in the BS of source or the data message forwarding of buffer memory in described source BS returned to source ASN-GW and control according to the respective handling pattern information in the switching message between described source ASN-GW and source BS, when selecting to abandon, notify described source BS to abandon the data message of buffer memory in it, then finish this step; When select forward time, notify described source BS by the data message forwarding of buffer memory in it in described source ASN-GW, then perform step A1124;
A1124, described source BS, by the data channel of setting up between itself and described source ASN-GW, send to described source ASN-GW by the data message of buffer memory in it;
A1125, described source ASN-GW are kept at the data message receiving in the buffer of described foundation;
Described steps A 212 specifically comprises:
A2123, when switching, the data message of giving MSS to be sent that described source BS transmits from CSN by the buffer buffer memory of described foundation, and determine be discarded in the data message of buffer memory in the BS of source or the data message of buffer memory in described source BS is kept in the buffer of described foundation according to the handover management information of BS inside, when selecting to abandon, notify described source BS to abandon the data message of buffer memory in it, then finish this step; When selecting to preserve, notify described source BS the data message of buffer memory in it to be saved in the buffer of setting up in it, then perform step A1124;
A1124, described source BS are kept at the data message of buffer memory in it in buffer of described foundation.
8. method according to claim 2, is characterized in that,
Described steps A 12 specifically comprises:
A121, when switching, after source ASN-GW and target ASN-GW consult, by target ASN-GW notice, CSN sets up described CSN to the data channel target ASN-GW, and by described newly-built data channel, send the data message that sends to MSS transmitting from CSN to described target ASN-GW; Meanwhile, 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 by the data message to MSS to be sent that sends to it by described data channel;
Or,
A122, when switching, source ASN-GW or target ASN-GW trigger and determine to change the data channel from CSN to source ASN-GW, by the newly-built data channel from CSN to target ASN-GW of described target ASN-GW notice CSN, and by described newly-built data channel, send the data message that sends to MSS transmitting from CSN to described target ASN-GW; Meanwhile, described source ASN-GW, by the data channel between described source ASN-GW and target ASN-GW, sends to the data message to MSS to be sent that sends to it in target ASN-GW;
Described steps A 22 specifically comprises:
A221, when switching, after source BS and target BS are consulted, by target BS notice, CSN sets up described CSN to the data channel target BS, and by described newly-built data channel, sends the data message that sends to MSS transmitting from CSN to described target BS; Meanwhile, target BS notification source BS sets up source BS to the data channel between target BS, and notification source BS sends to target BS by the data message to MSS to be sent that sends to it by described data channel;
Or,
A222, when switching, source BS or target BS trigger and determine to change the data channel from CSN to source BS, by the newly-built data channel from CSN to target BS of described target BS notice CSN, and by described newly-built data channel, send the data message that sends to MSS transmitting from CSN to described target BS; Meanwhile, described source BS, by the data channel between described source BS and target BS, sends to the data message to MSS to be sent that sends to it in target BS.
9. in wireless access technology, can't harm a method of switching, it is characterized in that, comprising:
When switching, by target network element, pass through the data channel between source network element and target network element, reception is buffered in the data message to mobile subscriber station MSS to be sent of source network element, and the connectivity serving network CSN that passes through to set up is to the data channel between target network element, receives the data message that sends to MSS transmitting from CSN; The method specifically comprises:
When switching, by the data channel between source access service network gateway ASN-GW and target ASN-GW, reception is buffered in the data message to MSS to be sent of source ASN-GW, and arrive the data channel between target ASN-GW by the CSN setting up, receive the data message that sends to MSS transmitting from CSN;
Or,
When switching, by the data channel between source base station BS and target BS, reception is buffered in the data message to MSS to be sent of source BS, and the CSN that passes through to set up is to the data channel between target BS, receives the data message that sends to MSS transmitting from CSN.
10. in wireless access technology, can't harm a system of switching, it is characterized in that, comprising:
Source network element, when switching, for by the data channel between source network element and target network element, by the data message forwarding to mobile subscriber station MSS to be sent that is buffered in source network element to corresponding target network element;
CSN, to the data channel between target network element, sends the data message that sends to MSS transmitting from CSN to described target network element for the connectivity serving network CSN by setting up;
Specifically comprise:
Source network element, when switching, for by the data channel between source access service network gateway ASN-GW and target ASN-GW, by the data message forwarding to MSS to be sent that is buffered in source ASN-GW to corresponding target ASN-GW; CSN, to the data channel between target ASN-GW, sends the data message that sends to MSS transmitting from CSN to described target ASN-GW for the CSN by setting up;
Or,
Source network element, when switching, for by the data channel between source base station BS and target BS, by the data message forwarding to MSS to be sent that is buffered in source BS to corresponding target BS; CSN, to the data channel between target BS, sends the data message that sends to MSS transmitting from CSN to described target BS for the CSN by setting up.
11. 1 kinds can't harm the device switching in wireless access technology, it is characterized in that, comprising:
When switching, by the data channel between source network element and target network element, receive the module of the data message to mobile subscriber station MSS to be sent that is buffered in source network element; With
By the connectivity serving network CSN that sets up, to the data channel between target network element, receive the module of the data message that sends to MSS that transmits from CSN;
Specifically comprise:
When switching, by the data channel between source access service network gateway ASN-GW and target ASN-GW, receive the module of the data message to MSS to be sent that is buffered in source ASN-GW; And arrive the data channel between target ASN-GW by the CSN setting up, receive the module of the data message that sends to MSS transmitting from CSN;
Or,
When switching, by the data channel between source base station BS and target BS, receive the module of the data message to MSS to be sent that is buffered in source BS; And the CSN that passes through to set up is to the data channel between target BS, receives the module of the data message that sends to MSS transmitting from CSN.
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