CN1992963A - Information processing method during switching of wireless communication system - Google Patents
Information processing method during switching of wireless communication system Download PDFInfo
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- CN1992963A CN1992963A CNA2005100974688A CN200510097468A CN1992963A CN 1992963 A CN1992963 A CN 1992963A CN A2005100974688 A CNA2005100974688 A CN A2005100974688A CN 200510097468 A CN200510097468 A CN 200510097468A CN 1992963 A CN1992963 A CN 1992963A
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Abstract
The invention relates to a message processing method in the switch of wireless communication system, used to position the base station controller switch process of user conversation, wherein said method comprises that: in the switch process of base station controller, it sues the switch command between controllers to transmit the connection information of strategy function module PF to the target base station controller; when the target controller is used as anchor base station controller to position the user conversation again, the target controller will base on received PF connection information build connection with user PF.
Description
Technical field
The present invention relates to the handoff technique of wireless communication system, relate in particular to base station controller information processing method during the grappling user conversation again in handoff procedure.
Background technology
World Interoperability for Microwave Access, WiMax (WiMAX) network is a kind of solution that provides for wireless MAN access technology or wide-area, wireless network.Fig. 1 is the structure chart of WiMAX access service network (ASN, AccessService Network).Referring to Fig. 1, in ASN, mainly there are two network elements, one is access base station (BS, Base Station); One is base station controller, i.e. access service network gateway among Fig. 1 (ASN-GW, Access Service Network GateWay), ASN-GW have comprised commit point (Decision Point) unit and carried out point (Enforcement point) unit.Described BS by R6 interface and ASN-GW communication, passes through the R8 interface communication by R1 interface and user terminal communication between the BS; Pass through the Interface R4 communication between the ASN-GW, by Interface R3 and connectivity serving network (CSN, Connectivity Service Network) communication.
Fig. 2 is the Qos structure system figure of existing WiMAX network.Referring to Fig. 2, the Qos structure system structure of this WiMAX comprises:
User terminal (SS).
Service flow management device (SFM, A Service Flow Management) is responsible for setting up user traffic flow and traffic flow assignment Radio Resource etc. for this reason, and this functive is present among the ASN of WiMAX.
Service flow authorization person (SFA, A Service Flow Authorization) is responsible for authorizing to corresponding business stream, and this functive is present among the ASN.
Policing feature module (PF, policy function), for certain user traffic flow provides Qos strategy, this functive is present among the CSN of WiMAX network.
Directly by application layer protocol connected reference AF, AF will notify PF initiatively for the user creates Business Stream for application service functional module (AF, Application functions), user terminal, and this functive is present among the CSN.
Transmission Qos policy interface is based on the WiMax interface on Via R3 and the R5 interface between SFA and the PF.
When user terminal carries out inter-network when moving, need the access network element of user conversation be switched, be about to user conversation and switch to the BS and the ASN-GW of the current affiliated subdistrict of user terminal from original BS and ASN-GW, the transmission of user conversation is transferred to described CSN by new ASN-GW.The former ASN-GW that this switching is called switching (Inter-ASN-GW) between ASN-GW again before will switching herein is called service (Serving) ASN-GW, and the new ASN-GW after the switching is called target (target) ASN-GW.In the prior art, when a user terminal switched between two ASN-GW, will there be two possible scenes in the transmission of user conversation from target ASN-GW to CSN, below described respectively with reference to Fig. 3.
Fig. 3 A is for setting up the scene schematic diagram that the R4 data channel is carried out user conversation between target ASN-GW and anchor ASN-GW.Referring to Fig. 3 A, thick chain-dotted line 30 is the path of user conversation before switching, and heavy line 31 is for switching the path of back user conversation.When user terminal switches ASN-GW, between anchor (anchor) ASN-GW (supposing that herein anchor ASN-GW and service ASN-GW are same ASN-WG), set up a R4 data channel at target ASN-GW, user data is transferred to anchor ASN-GW earlier by target ASN-GW, is forwarded to CSN again by anchor ASN-GW then.
Fig. 3 B is target ASN-GW carries out user conversation as new anchor ASN-GW a scene schematic diagram.Referring to Fig. 3 B, thick chain-dotted line 30 is the path of user conversation before switching, and heavy line 31 is for switching the path of back user conversation.When user terminal switched ASN-GW, target ASN-GW is the grappling user conversation again, and the new anchor ASN-GW as user conversation directly is connected to CSN with user conversation.
Above-mentioned two kinds of scenes all can take place when Inter-ASN-GW switches, and generally speaking, user conversation will be through target ASN-GW to anchor ASN-GW, again by anchor ASN-GW to CSN, i.e. scene shown in Fig. 3 A; But when original anchor ASN-GW can initiatively require to serve as new anchor ASN-GW by target ASN-GW to target ASN-GW in some cases, or work as target ASN-GW and think that former anchor ASN-GW responded slow, under the situations such as inadequate resource, can initiatively initiate request to former anchor ASN-GW, require self to serve as new anchor ASN-GW, i.e. scene shown in Fig. 3 B.
Fig. 4 is in the prior art, and anchor ASN-GW initiatively requires the switching flow figure under target ASN-GW grappling user conversation situation again.Switching flow please refer to the standard document of existing WiMAX in detail.Only do concise and to the point description herein.Referring to Fig. 4, this flow process comprises:
Step 401, scanning process, mainly scanning the candidate from adjacent ASN switches object, i.e. target BS tabulation.
Step 402, serving BS broadcasts and/or target BS are undertaken alternately by ASN-GW separately, select desirable switching object from described BS tabulation, i.e. the target BS that need switch to, and user terminal notification target BS will carry out handoff procedure (HO procedure).
Step 404, target ASN-GW send data channel to anchor ASN-GW and set up request (DataPath Est REQ);
After step 405, anchor ASN-GW received Data Path Est REQ, decision was served as new anchor ASN-GW by target ASN-GW, sends again anchoring request (Relocate REQ) to target ASN-GW.
After step 406, target ASN-GW receive Relocate REQ, carry out alternately with grappling user conversation again with home agent device (HomeAgent).
Behind step 407, the target ASN-GW grappling user conversation, ((Relocate RES) notifies former anchor ASN-GW success grappling user conversation to return the response of grappling again to former anchor ASN-GW.
Fig. 5 is in the prior art, and target ASN-GW initiatively requires at switching flow figure under the grappling user conversation situation again itself.Switching flow please refer to the standard document of existing WiMAX in detail.Only do concise and to the point description herein.Referring to Fig. 5, this flow process comprises:
Step 501, scanning process, mainly scanning the candidate from adjacent ASN switches object, i.e. target BS tabulation.
Step 502, serving BS broadcasts and/or target BS are carried out alternately, select desirable switching object from described BS tabulation, i.e. the target BS that need switch to, and the user terminal notice is switched object and is carried out HOprocedure.
Step 503, user terminal insert the process (re-entry procedure) of target ASN again; In this process, if there is not the session context of user terminal in the target BS, then target BS is obtained the session context of user terminal, and concrete acquisition process can send Information Request, obtains from former service ASN-GW by target ASN-GW.
Step 504, target ASN-GW decision send the redirect notification (R3Redirection Ind) of Interface R3 by self serving as new anchor ASN-GW to former anchor ASN-GW.
After step 505, anchor ASN-GW receive R3Redirection Ind, learn that target ASN-GW wishes to serve as anchor ASN-GW, send again anchoring request (Relocate REQ) to target ASN-GW.
After step 506, target ASN-GW receive Relocate REQ, carry out alternately with grappling user conversation again with Home Agent.
Behind step 507, the target ASN-GW grappling user conversation, return the response of grappling again (Relocate RES) to former anchor ASN-GW and notify former anchor ASN-GW success grappling user conversation.
When target ASN-GW will serve as new anchor ASN-GW,, need to get in touch with the PF foundation of described user conversation again, and carry out the Qos Signalling exchange with PF in order to carry out the Qos strategy.But, in the prior art, when also not providing target ASN-GW and serving as new anchor ASN-GW, how to rebulid the technical scheme of getting in touch with PF.
Summary of the invention
In view of this, the information processing method when main purpose of the present invention is to provide a kind of wireless communication system to switch is realized when target base station controller serves as new anchorage station control, can rebulid with PF to get in touch and carry out alternately.
In order to realize the foregoing invention purpose, main technical schemes of the present invention is:
Information processing method when a kind of wireless communication system switches is applicable to again the base station controller handoff procedure of grappling user conversation, and this method comprises:
In the handoff procedure of base station controller, by the hand off signaling between base station controller, with the join dependency message transmission of described user conversation corresponding strategy functional module PF to target base station controller;
After target base station controller was as the new anchorage station control described user conversation of grappling again, target base station controller was got in touch according to the PF foundation of PF join dependency information of receiving and described user conversation and is mutual with it.
Described join dependency message transmission with PF specifically comprises to target base station controller:
In the specific fields of the message of anchoring request again that target base station controller sends, carry described PF join dependency information at former anchorage station control, target base station controller receives that this again after the anchoring request message, parses described PF join dependency information from described specific fields.
Described join dependency message transmission with PF specifically comprises to target base station controller:
Specific fields in the contextual information of described user conversation is provided with PF join dependency information in advance, in handoff procedure, described PF join dependency information is along with the context of this user conversation sends in the target base station controller, and the purpose base station controller parses described PF information from the contextual described specific fields of this user conversation.
Described join dependency message transmission with PF specifically comprises to target base station controller:
Target base station controller after former anchorage station control is received this request, sends to target base station controller with described PF join dependency information by sending Information Request to former anchorage station control request PF join dependency information.
Described PF join dependency information comprises: PF address information, application layer traffic stream identifier and corresponding quality of service information thereof.
The described PF join dependency information of transmission that needs is: PF address information and application layer traffic stream identifier and corresponding quality of service information thereof.
Described PF address information static configuration is in each base station controller, and the described PF join dependency information that needs to transmit is application layer traffic stream identifier and corresponding quality of service information thereof.
Described method further comprises: target base station controller carries out the mutual of service quality signal according to described quality of service information and described PF, ensures the service quality of user conversation.
PF join dependency information that described basis is received and the PF of described user conversation foundation are got in touch and mutual concrete grammar is:
The purpose base station controller sends information and the described application layer traffic stream identifier and the corresponding quality of service information thereof of this base station controller to this PF according to described PF address information; PF receives that the back finds the user conversation of this Business Stream correspondence according to described application layer traffic stream identifier, is the information of described purpose base station controller with the anchorage station control information updating of this user conversation; Described PF and purpose base station controller are set up contact and are carried out mutual according to the other side's information that is obtained.
Described wireless communication system is a World Interoperability for Microwave Access, WiMax WiMAX network, and described base station controller is the access service network gateway in the WiMAX network.
Method of the present invention is in the handoff procedure of base station controller, the PF join dependency information of user conversation is sent to purpose base station controller after the switching by anchorage station control or serving BS controller, when purpose base station controller grappling user conversation again, just can utilize PF link information and this PF foundation of this user conversation of being received to get in touch, and mutual with it.Therefore, the present invention can be so that switch and again after the grappling at base station controller, new anchorage station control still can be kept in touch with the PF of user conversation, do not influence the Qos service of PF to user conversation, ensure that user conversation has the favorable service quality when switching, improved user satisfaction.The present invention is particularly useful for the WiMax network, can attract the user actively to use the WiMax network to carry out Qos and ensure, improves the economic benefit of Virtual network operator.
Description of drawings
Fig. 1 is the structure chart of WiMAX access service network;
Fig. 2 is the Qos structure system figure of existing WiMAX network;
Fig. 3 A is for setting up the scene schematic diagram that the R4 data channel is carried out user conversation between target ASN-GW and anchor ASN-GW;
Fig. 3 B is target ASN-GW carries out user conversation as new anchor ASN-GW a scene schematic diagram;
Fig. 4 is in the prior art, and anchor ASN-GW initiatively requires the switching flow figure under target ASN-GW grappling user conversation situation again;
Fig. 5 is in the prior art, and target ASN-GW initiatively requires at switching flow figure under the grappling user conversation situation again itself;
Fig. 6 is the flow chart of the information processing method of wireless communication system switching of the present invention;
Fig. 7 carries out the scene schematic diagram of user conversation as new anchor ASN-GW for target ASN-GW of the present invention;
Fig. 8 is the flow chart of first embodiment of the method for the invention;
Fig. 9 is the flow chart of second embodiment of the method for the invention;
Figure 10 is the flow chart of the 3rd embodiment of the method for the invention.
Embodiment
Below by specific embodiments and the drawings the present invention is described in further details.
Fig. 6 is the flow chart of the information processing method of wireless communication system switching of the present invention, and referring to Fig. 6, this flow process comprises:
The present invention is applicable to again the base station controller handoff procedure of grappling user conversation, can be applicable in the WiMAX network, also can be applied in other wireless communication systems.This paper is that the present invention will be described for example with the WiMAX network.In the WiMAX network, described base station controller is ASN-GW.
Fig. 7 carries out the scene schematic diagram of user conversation as new anchor ASN-GW for target ASN-GW of the present invention.Referring to Fig. 7, thick chain-dotted line 70 is the path of user conversation before switching, and heavy line 71 is for switching the path of back user conversation.Again the scene of grappling ASN-GW has taken place in handoff procedure, this scene comprises the grappling situation of initiatively being initiated by target ASN-GW again, or the grappling situation again initiatively initiated of anchor ASN-GW, under this scene, originally anchor ASN-GW or service ASN-GW need to transmit PF join dependency information to target ASN-GW, target ASN-GW is as new anchor ASN-GW, sets up and being connected of PF according to the PF join dependency information that passes over.
Described PF join dependency information comprises: the Qos information of PF address information, application layer traffic stream identifier (FlowID, Service flow ID) information and Flow ID correspondence.Described Qos information is also referred to as Qos parameter set (SF_Qos), comprises all Qos parameters of this Business Stream among this SF_Qos, comprises bandwidth, speed etc., and this SF_Qos utilizes physical layer traffic stream identifier (SFID) to carry out index.SFID mainly is the sign of MAC layer for Business Stream, the sign that is used for identification service stream that generates voluntarily by ASN-GW, be used to identify each bar Business Stream, the corresponding unidirectional connection that independently, has Qos to guarantee of each bar Business Stream, Business Stream can be that what to set up in advance also can be dynamically to set up.
Described Flow ID is for to be used for identifying the Qos Business Stream in the Qos system, mainly be that to be used for PF and SFA be that business between the ASN-GW is connected, and is that PF is used for the identifier of identifying user session.Flow ID is in the sign of high level (being application) to a unidirectional connection, the traffic stream identifier (SFID) of its corresponding unique MAC layer (being physical layer), and Flow ID is distributed by PF.
Concrete, the mode that described PF join dependency information is delivered to target ASN-GW by anchor ASN-GW or service ASN-GW has multiple, by following examples method of the present invention is described respectively.
Fig. 8 is the flow chart of first embodiment of the method for the invention.Referring to Fig. 8, this flow process comprises:
Scanning in step 801～step 803, the handoff procedure, notice HO process and insert target ASN process again, same as the prior art, repeat no more herein.
Step 804, target ASN-GW send the redirect notification (the grappling situation of initiatively being initiated by target ASN-GW again) that data channel is set up request (the grappling situation again that anchor ASN-GW initiatively initiates) or sent Interface R3 to former anchor ASN-GW.
Step 805, former anchor ASN-GW add again described PF join dependency information (the Qos information that comprises PF address information, Flow ID, Flow ID correspondence) in the anchoring request (Relocate REQ) specific fields.
Step 806, former anchor ASN-GW send the anchoring request again of carrying PF join dependency information to target ASN-GW.
Step 807, target ASN-GW are extracted described PF join dependency information from the specific fields of anchoring request again.
Step 808～step 809, target ASN-GW be the described user conversation of grappling again, and returns grappling again and respond to former anchor ASN-GW.
Step 810, target ASN-GW according to described PF link information rebulid with described PF get in touch and mutual with it.
This step specifically comprises: purpose ASN-GW to the Qos information that this PF sends the information (address information that mainly comprises this ASN-GW) of this ASN-GW, described Flow ID and FlowID correspondence, for example can carry described information according to described PF address information in the PD-Request message that sends to PF; PF receives that the back finds the user conversation of this Business Stream correspondence according to described Flow ID, and learns the Qos information (being the Qos information of Flow ID correspondence) of this user conversation, is the information of described purpose ASN-GW with the anchor ASN-GW information updating of this user conversation; Described PF and purpose ASN-GW set up contact and carry out mutual (Qos Signalling exchange) according to the other side's information that is obtained (mainly being address information), target ASN-GW carries out the Qos Signalling exchange according to described Qos information and described PF, can ensure the service quality of described user conversation.
Fig. 9 is the flow chart of second embodiment of the method for the invention.In the present embodiment, the described former anchor ASN-GW specific fields in the contextual information of user conversation in advance is provided with PF join dependency information (comprising PF address information, Flow ID and and the Qos information of Flow ID correspondence).Below for being provided with the contextual specifying information of user conversation of PF join dependency information:
1, accessing user terminal to network sign (MS NAI).
2, user terminal physical layer address (MS MAC Address).
3, the anchor ASN-GW address of user terminal correspondence (Anchor ASN-GW associated with theMS).
4, PF join dependency information (List of PF with associated):
IP address 4.1PF (PF IP address);
4.2Flow identifier (Flow ID);
4.3Flow the Qos information of ID correspondence;
(4.4SFID also can be included in the Qos information);
4.5 other PF join dependency information.
5, Business Stream relevant information (List of Service Flow IDs with associated):
5.1 type of service (SF Classifiers);
5.2 quality of service (SF QoS);
5.3 connection identifier (CID (associated with the SFID));
5.4 data channel information (Data Path tagging (ID) Information);
5.5 other Business Stream relevant information (Etc).
6, R3 information (R3related information):
Home agent IP address 6.1 (Home Agent IP address);
Address 6.2CoA (IP address on the ASN-GW used as the end point of the tunnelwith the HA);
6.3DHCP server address (DHCP Server);
6.4AAA server address (AAA Server);
6.5 other R3 state information (R3 status Details);
7, security information (Security Information):
7.1PKMV2 security related information (Security information related to PKMv2);
7.2PMIP security related information (Security information related to Proxy MIP (if used));
Referring to Fig. 9, the flow process of this second embodiment comprises:
Scanning in step 901～step 903, the handoff procedure, notice HO process and insert target ASN process again; Unlike the prior art be in inserting target ASN process again, further comprise:
Step 9030, when carrying the contextual session information response message of user conversation when sending to target ASN-GW, target ASN-GW extracts described PF join dependency information from the contextual specific fields of user conversation that this session information response message is carried.
Step 904, target ASN-GW send the redirect notification that data channel is set up request or sent Interface R3 to former anchor ASN-GW.
Step 905～step 907, former anchor ASN-GW send anchoring request again to target ASN-GW; Target ASN-GW is the described user conversation of grappling again; And return grappling again and respond to former anchor ASN-GW.
Step 908, target ASN-GW rebulid and the getting in touch and carry out alternately of described PF according to described PF link information, and the concrete grammar of this step is identical with step 810.
Figure 10 is the flow chart of the 3rd embodiment of the method for the invention.Referring to Figure 10, this flow process comprises:
Scanning in step 101～step 103, the handoff procedure, notice HO process and insert target ASN process again.
Step 104, target ASN-GW send the redirect notification that data channel is set up request or sent Interface R3 to former anchor ASN-GW.
Step 105, former anchor ASN-GW send anchoring request again to target ASN-GW.
Step 106, target ASN-GW send and are used to ask the Information Request of PF join dependency information to former anchor ASN-GW.
Step 107, former anchor GS are added on described PF join dependency information (the Qos information that comprises PF address information, FlowID and Flow ID correspondence) in the session information response message, send to target ASN-GW, target ASN-GW extracts PF join dependency information from session information response.
Step 108～step 109, target ASN-GW be the described user conversation of grappling again; And return grappling again and respond to former anchor ASN-GW.
Step 1010, target ASN-GW rebulid and the getting in touch and carry out mutual of described PF according to described PF link information.The detailed process of this step is identical with step 810.
In above-mentioned three embodiment, the PF join dependency information that described need are transferred to target ASN-GW comprises: the Qos information of PF address information, Flow ID and Flow ID correspondence.If PF address information static configuration is in each ASN-GW, because target ASN-GW has known the PF address information, therefore this moment, as long as described anchor ASN-GW or service ASN-GW were transferred to the PF join dependency information of target ASN-GW the Qos information of Flow ID and Flow ID correspondence.
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 the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (10)
- Information processing method when 1, a kind of wireless communication system switches is applicable to again the base station controller handoff procedure of grappling user conversation to it is characterized in that this method comprises:In the handoff procedure of base station controller, by the hand off signaling between base station controller, with the join dependency message transmission of described user conversation corresponding strategy functional module PF to target base station controller;After target base station controller was as the new anchorage station control described user conversation of grappling again, target base station controller was got in touch according to the PF foundation of PF join dependency information of receiving and described user conversation and is mutual with it.
- 2, method according to claim 1 is characterized in that, described join dependency message transmission with PF specifically comprises to target base station controller:In the specific fields of the message of anchoring request again that target base station controller sends, carry described PF join dependency information at former anchorage station control, target base station controller receives that this again after the anchoring request message, parses described PF join dependency information from described specific fields.
- 3, method according to claim 1 is characterized in that, described join dependency message transmission with PF specifically comprises to target base station controller:Specific fields in the contextual information of described user conversation is provided with PF join dependency information in advance, in handoff procedure, described PF join dependency information is along with the context of this user conversation sends in the target base station controller, and the purpose base station controller parses described PF information from the contextual described specific fields of this user conversation.
- 4, method according to claim 1 is characterized in that, described join dependency message transmission with PF specifically comprises to target base station controller:Target base station controller after former anchorage station control is received this request, sends to target base station controller with described PF join dependency information by sending Information Request to former anchorage station control request PF join dependency information.
- 5, method according to claim 1 is characterized in that, described PF join dependency information comprises: PF address information, application layer traffic stream identifier and corresponding quality of service information thereof.
- 6, method according to claim 5 is characterized in that, the described PF join dependency information of transmission that needs is: PF address information and application layer traffic stream identifier and corresponding quality of service information thereof.
- 7, method according to claim 5 is characterized in that, described PF address information static configuration is in each base station controller, and the described PF join dependency information that needs to transmit is application layer traffic stream identifier and corresponding quality of service information thereof.
- 8, according to claim 6 or 7 described methods, it is characterized in that described method further comprises: target base station controller carries out the mutual of service quality signal according to described quality of service information and described PF, ensures the service quality of user conversation.
- According to claim 5,6 or 7 described methods, it is characterized in that 9, PF join dependency information that described basis is received and the PF of described user conversation foundation are got in touch and mutual concrete grammar is:The purpose base station controller sends information and the described application layer traffic stream identifier and the corresponding quality of service information thereof of this base station controller to this PF according to described PF address information; PF receives that the back finds the user conversation of this Business Stream correspondence according to described application layer traffic stream identifier, is the information of described purpose base station controller with the anchorage station control information updating of this user conversation; Described PF and purpose base station controller are set up contact and are carried out mutual according to the other side's information that is obtained.
- According to each described method of claim 1 to 7, it is characterized in that 10, described wireless communication system is a World Interoperability for Microwave Access, WiMax WiMAX network, described base station controller is the access service network gateway in the WiMAX network.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101384081B (en) * | 2007-09-07 | 2013-06-05 | 华为技术有限公司 | Method and apparatus for transmitting service anchor positioning information |
| CN103597902A (en) * | 2011-03-31 | 2014-02-19 | 北京新岸线移动多媒体技术有限公司 | Traffic flow establishment method and device and traffic flow modification method and device |
| CN105635986A (en) * | 2012-03-06 | 2016-06-01 | 北京新岸线移动多媒体技术有限公司 | Business flow modification method and device |
-
2005
- 2005-12-28 CN CNB2005100974688A patent/CN100544485C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101384081B (en) * | 2007-09-07 | 2013-06-05 | 华为技术有限公司 | Method and apparatus for transmitting service anchor positioning information |
| CN103597902A (en) * | 2011-03-31 | 2014-02-19 | 北京新岸线移动多媒体技术有限公司 | Traffic flow establishment method and device and traffic flow modification method and device |
| CN105635986A (en) * | 2012-03-06 | 2016-06-01 | 北京新岸线移动多媒体技术有限公司 | Business flow modification method and device |
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| CN100544485C (en) | 2009-09-23 |
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