CN101448280B - Method for intercepting switch events in WiMAX system - Google Patents
Method for intercepting switch events in WiMAX system Download PDFInfo
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- CN101448280B CN101448280B CN2008100810130A CN200810081013A CN101448280B CN 101448280 B CN101448280 B CN 101448280B CN 2008100810130 A CN2008100810130 A CN 2008100810130A CN 200810081013 A CN200810081013 A CN 200810081013A CN 101448280 B CN101448280 B CN 101448280B
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Abstract
The invention provides a method for intercepting switch events in WiMAX system. The method comprises the following steps: receiving switch request information forwarded by a base station (BS) which is providing services at the switch preparation phase when switch occurs to a mobile station (MS), judging whether an access gateway (AGW) governed by a target base station (BS) transmits the switch request information to the target BS according to parameters carried in the switch request information, judging whether a switched user is an intercepted user, and determining whether to report initial switch events to a laboratory information system (LIS) according to a judgment result. In the method, passively forwarding information is changed into actively analyzing awareness information by improving the function of an ASN-GW in the switch process; and a corresponding ASN-GW analyzes corresponding information on different occasions in the switch process, and reports the switch events of the intercepted user according to an analysis result, thus achieving the purpose of intercepting the switch events.
Description
Technical field
The present invention relates to a kind of micro-wave access to global intercommunication (Worldwide Interoperabilityfor Microwave Access, WiMAX) method of listening in user switching event in the network.
Background technology
WiMAX is based on the wireless access wide band technology of IEEE 802.16 standards, can effectively utilize the limited wireless frequency spectrum resource and bigger bandwidth of air-interface (data transmission capabilities of the highest 70Mbps) is provided.Its network reference model as shown in Figure 1, by SS/MS, access business network (ASN) be connected three logic entities of business network (CSN) and form, each logic entity has been represented one group of functional entity, and each function can or be distributed in a plurality of physical equipments at single physical and realize.
Home network services provider (H-NSP): local network service provider.H-NSP is an operator or commercial organization, and it has the user-dependent Service Level Agreement with WiMAX, the session of authentication and authorized user (the interior and roaming scence of net), the charging of customer service (chargeing and bill).In order to support services of roaming, a H-NSP can have roaming relationships with other NSP.Authentication, mandate and the accounting server (AAA) and home agent (HA) network element that mainly comprise the storing user subscription business in the H-NSP network.
Visited network service provider (V-NSP): visited network service provider.V-NSP defines from roamer's angle, and the roamer uses the wireless coverage visit WiMAX service of V-NSP.V-NSP can have roaming agreement with user's H-NSP, and V-NSP is provided to the professional route of AAA of H-NSP.Based on the roaming agreement between user WiMAX service request and H-NSP and the V-NSP, V-NSP can provide some or all of WiMAX business to the roamer, perhaps provides the professional route of data/control to H-NSP.Mainly comprising in the V-NSP network provides authentication, mandate and accounting server (AAA) and home agent (HA) network element of acting on behalf of forwarding capability.
Network Access Provider (NAP): Network Access Provider.Network Access Provider is the business units that WiMAX wireless access framework is provided for one or more WiMAX Internet Service Providers (NSP).Comprise one or more access service network (ASN) among the NAP, WiMAX NWG standard code, ASN has two kinds of frameworks: MODEL C (ProfileC) ASN is made up of base station (BS) and two stand-alone network elements of Access Service Network Gateway (AGW); Model B (Profile B) ASN only comprises comprehensive base station (IBS), the BS+AGW of its functional equivalent in MODEL C.
ASN is mainly WiMAX user corresponding wireless access and control is provided, and ASN is made up of base station (BS) and IAD (ASN-GW).
CSN has comprised authentication, mandate, billing function (AAA) and home agent (HA) for MS provides IP Connection Service.
WiMAX has defined two types switching: the switching of the switching of ASN grappling and CSN grappling.The switching that Anchor DP does not change is referred to as the switching of ASN grappling, otherwise the switching that Anchor DP changes is referred to as the switching of CSN grappling.Usually the switching of ASN grappling can take place earlier in the user, if Anchor DP needs to change then, initiates the switching of CSN grappling again.
Between transfer period, the current BS that is serving for the user is called Serving BS, and purpose BS is called Target BS.IAD (ASN-GW) is according to user's position, and state of user can be divided into different functional entitys with handling process.The functional entity that is mainly concerned with in the present invention comprises Target AGW, Serving AGW, Relay AGW and Anchor DP.The current ASN-GW that is serving for the user is called Serving AGW.Purpose ASN-GW is called Target AGW during switching, and after handover success was finished, TargetAGW changed Serving AGW into.During switching, the AGW that switches message between relaying Serving BS and the Target BS is called Relay AGW, stops the Relay AGW that relaying is transmitted to Target BS and is called Last Relay AGW switching message.The ASN-GW at user's grappling data channel processing capacity place is called Anchor DP.Former Anchor DP is meant the Anchor DP that serves for the user before the switching of CSN grappling, the purpose Anchor DP when Target Anchor DP is meant the switching of CSN grappling.
The switching of ASN grappling is divided into two stages again in the WiMAX network: handoff preparation phase and handover execution stage.In handoff preparation phase, switch the mutual of message between Serving BS and a plurality of Target BS, finish preparations such as resource reservation.In handover execution stage, selected Target BS carries out the establishment of data channel, and user's switching is finished in work such as user's network re-entry.
WiMAX network work group (Network Work Group is called for short NWG) is the working group that is devoted to study the WiMAX system definition network architecture and reference model below WiMAX organizes.At present, this working group has begun to determine the Lawful Interception framework in the WiMAX network, as shown in Figure 2.Lawful Interception framework according to present WiMAX network, network element (the ASN-GW of WiMAX network, HA, AAA) all can provide interface with monitor for police server Lawful Interception Server (LIS), each network element need be responsible for monitoring and collect controlled user profile on this network element, and this information reported LIS, by the unified interface that law enforcement agency (LEA) is provided of LIS.
After law enforcement agency is provided with monitoring to certain user, need in time obtain user's life event and the current position of user.Switching is because the mobile of user caused, switches the position that explanation user in back is taken place variation taken place, and current ServingAGW for user's service, Serving BS, variation may take place in Anchor DP.After the switching of ASN grappling was finished, the Serving BS that serves for the user can change, and Serving AGW also might change.After the switching of CSN grappling was finished, user's Anchor DP can change, and Anchor DP is an essential functional entities of monitoring users data message, needed the Anchor DP that is in time serving for the user to law enforcement agency's report.Therefore switching (switching of the switching of ASN grappling and CSN grappling) is significant incident, need report to law enforcement agency.
In the existing WiMAX agreement, the control point of switching is at BS, and the initiation of flow process, control, execution are all carried out at BS.For the WiMAX network that does not have interface between the BS, ASN-GW is only as the relaying that switches message between Serving BS and the Target BS, passive forwarding message, not active perception handover event.And for the WiMAX network that has interface between the BS, switch message can not pass through ASN-GW, directly between Target BS and Serving BS, transmitting, ASN-GW more can't the active perception handover event.Therefore according to existing protocol, the ASN-GW that is responsible for monitoring and collects controlled user profile can not be with this significant reporting events because can't the perception handover event and can not intercepting switch events.Therefore need a kind of method how to solve the handover event of monitoring users in the WiMAX system, and in time report the problem of law enforcement agency.
Summary of the invention
The invention provides a kind of method in sum, by strengthening the function of ASN-GW in handoff procedure, change active analysis perception message into by passive forwarding message, on the different opportunitys of handoff procedure, analyze corresponding message by corresponding ASN-GW, and report the handover event of intercepted user, thereby reach the purpose of intercepting switch events according to analysis result.
Method according to intercepting switch events in a kind of WiMAX of the present invention system comprises: when travelling carriage (MS) when switching, in handoff preparation phase, the IAD of receiving the handoff request message that the BS that serving transmits is judged purpose base station (BS) according to the parameter of carrying in the handoff request message and whether is belonged to its administration, if judged result is for being, then described IAD (AGW) sends to purpose BS with handoff request message, and judge whether the user of switching is intercepted user, determine whether to report the beginning incident of switching according to judged result to monitor for police server (LIS).
Wherein, AGW detects according to controlled subscriber's meter whether the user who switches is intercepted user.
Further, when the user who judges switching as AGW is intercepted user, comprising: report to LIS and switch the beginning incident, and carry the Base Station Identification that the user may switch to; And LIS receive switch the beginning incident after, report the beginning incident of switching to law enforcement agency (LEA).
Further, the stage is finished in switching in access business network (ASN) grappling, also comprise: after successfully setting up data channel between purpose AGW and the grappling DP (Anchor DP), Anchor DP determines that handover success finishes, and judges whether the user who switches is intercepted user; And be to be under the situation of intercepted user in judged result, report to switch to LIS and finish incident, and the Base Station Identification that the user has switched to is reported LIS, and LIS receive switch finish incident after, report the incident of finishing of switching to LEA.
Further, after the switching that take place to connect business network (CSN) grappling, also comprise: purpose Anchor DP judges whether the user is intercepted user after receiving DPF handoff request message from former Anchor DP; In judged result is to be under the situation of intercepted user, reports CSN to switch the beginning incident to LIS, and carries the purpose Anchor DP sign that the user may switch to, and after LIS receives that CSN switches the beginning incident, reports CSN to switch the beginning incident to LEA.
Further, when CSN grappling finishing switching, also comprise: former Anchor DP judges whether the user is intercepted user after receiving DFP switching response message from purpose Anchor DP; And be to be under the situation of intercepted user in judged result, report CSN to switch to LIS and finish incident, and carry the Anchor DP sign that the user has switched to, after LIS receives that CSN switches the beginning incident, report CSN to switch the incident of finishing to LEA.
Further, when the WiMAX network was Model B, above-mentioned AGW was ASN.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is a WiMAX network architecture reference model;
Fig. 2 is a WiMAX network Lawful Interception framework reference model;
Fig. 3 switches the beginning event flow diagram according to reporting of the embodiment of the invention;
Fig. 4 switches according to reporting of the embodiment of the invention to finish event flow diagram;
Fig. 5 is that the CSN that reports according to the embodiment of the invention switches the beginning event flow diagram; And
Fig. 6 finishes event flow diagram according to the CSN switching that reports of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
The invention provides a kind of simple method solve in the WiMAX network can not intercepting switch events problem.The present invention is by strengthening the function of ASN in handoff procedure, change active analysis perception message into by passive forwarding message, on the different opportunitys of handoff procedure, analyze corresponding message by corresponding ASN, and report the handover event of intercepted user, thereby reach the purpose of intercepting switch events according to analysis result.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme.
Fig. 3 switches the beginning event flow diagram according to reporting of the embodiment of the invention.The network that this flow process is suitable for is not have interface between the BS, and the message between the different B S need be by the network of AGW relaying.In handoff preparation phase, be positioned at last the relaying AGW intercepting handoff request message on the handoff request message path, analyze this message, and report the switching of intercepted user to begin incident to LIS, give LIS the purpose BS Identify Report that the user may switch to according to analysis result.As shown in Figure 3, comprising:
Step 301: when MS switched, in handoff preparation phase, relaying AGW received that serving BS transmits handoff request message;
Step 302: after relaying AGW receives handoff request message,, judge Target BS not in the compass of competency of this AGW, need to continue this request message is transmitted to next relaying AGW according to the parameter of carrying in the message (purpose BS sign);
Step 303: this relaying AGW gives next relaying AGW with the handoff request forwards;
Step 304: after new relaying AGW receives this message, judge the compass of competency that Target BS belongs to this AGW, need to give Target BS with this handoff request forwards with step 301;
Step 305: this relaying AGW (Last Relay AGW) gives Target BS with the handoff request forwards;
Step 306: this relaying AGW (Last Relay AGW) detects whether intercepted user of the user that switches according to controlled subscriber's meter, if intercepted user execution in step 307,308 then, otherwise continue normal switching flow;
Step 307: this relaying AGW (Last Relay AGW) reports the switching of the intercepted user that switches to begin incident to LIS, carries the purpose BS sign that the user may switch in the message; And
Step 308:LIS reports this incident to LEA after receiving and switching the beginning incident.
In above-mentioned flow process, step 305 also can be carried out after step 307.
Fig. 4 switches according to reporting of the embodiment of the invention to finish event flow diagram.This flow process is applicable to the switching of all ASN grapplings.Finish the stage in switching, need to set up data channel between Target AGW and the Anchor DP, so that finish switching.After successfully setting up data channel between Target AGW and the Anchor DP, anchor DP thinks that this moment, handover success was finished, anchor DP judges whether the user of switching is intercepted user, if intercepted user then reports the incident of finishing of switching to LIS, the BS sign that the user has been switched to reports LIS.As shown in Figure 4, comprising:
Step 401: switch and finish the stage, set up data channel between Target AGW and the Anchor DP, so that finish switching;
Step 402: after data channel was successfully set up, Anchor DP detected according to controlled subscriber's meter whether the user who switches is intercepted user.If intercepted user execution in step 403,404 is then finished flow process otherwise continue normal the switching;
Step 403:Anchor DP reports the switching of the intercepted user that switches to finish incident to LIS, carries the BS sign that the user has switched in the message; And
Step 404:LIS reports this incident to LEA after receiving that incident is finished in switching.
Fig. 5 is that the CSN that reports of the embodiment of the invention switches the beginning event flow diagram.This flow process is applicable to the switching of all CSN grapplings.After the switching of CSN grappling begins, Targetanchor DP can receive the DPF handoff request message that former anchor DP (old anchor DP) sends, after Target anchor DP receives this message, judge whether the user is intercepted user, if intercepted user then reports CSN to switch the beginning incident to LIS, the purpose Anchor DP sign that the user may be switched to reports LIS.As shown in Figure 5, comprising:
Step 501: after the switching of CSN grappling began, Target anchor DP can receive the DPF handoff request message from former anchor DP;
After step 502:Target Anchor DP receives this message, detect whether intercepted user of the user that switches according to controlled subscriber's meter.If intercepted user execution in step 503,504 then, otherwise proceed normal CSN grappling switching flow;
Step 503:Target Anchor DP reports the CSN of the intercepted user that switches to switch the beginning incident to LIS, carries the purpose Targetanchor DP sign that the user may switch in the message; And
Step 504:LIS reports this incident to LEA after receiving that CSN switches the beginning incident.
Fig. 6 finishes event flow diagram according to the CSN switching that reports of the embodiment of the invention.This flow process is applicable to the switching of all CSN grapplings.When the finishing switching of CSN grappling, former anchor DP (old anchor DP) can receive the DPF switching response message that Target anchor DP sends, after former anchor DP receives this message, judge whether the user is intercepted user, if intercepted user then reports CSN to switch the incident of finishing to LIS, the Anchor DP sign that the user has been switched to reports LIS.As shown in Figure 6, comprising:
Step 601: when the finishing switching of CSN grappling, former anchor DP can receive the DPF switching response message from Target anchor DP;
Step 602: after former Anchor DP receives this message, detect whether intercepted user of the user that switches according to controlled subscriber's meter.If intercepted user execution in step 603,604 then, otherwise continue to finish normal CSN grappling switching flow;
Step 603: former Anchor DP reports the CSN of the intercepted user that switches to switch to LIS and finishes incident, carries the Anchor DP sign that the user has switched in the message; And
Step 604:LIS reports this incident to LEA after receiving that incident is finished in the CSN switching.
When the WiMAX network was Model B, the AGW in the above-mentioned flow process should be ASN.
In sum, the invention provides a kind of simple method solve in the WiMAX network can not intercepting switch events problem.The present invention is by strengthening the function of ASN in handoff procedure, change active analysis perception message into by passive forwarding message, on the different opportunitys of handoff procedure, analyze corresponding message by corresponding ASN, and report the handover event of intercepted user, thereby reach the purpose of intercepting switch events according to analysis result.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the method for intercepting switch events in the WiMAX system is characterized in that, comprising:
When travelling carriage switches, in handoff preparation phase, just receive that the parameter of carrying during IAD in the handoff request message that serving base station is transmitted is according to described handoff request message judges the purpose base station and whether belong to its administration, if judged result is for being, then described IAD sends to described purpose base station with described handoff request message, and judge whether the user of switching is intercepted user, determine whether to report the beginning incident of switching according to judged result to the monitor for police server.
2. method according to claim 1 is characterized in that, described IAD detects according to controlled subscriber's meter whether the user who switches is intercepted user.
3. method according to claim 2 is characterized in that, when the user who judges described switching when described IAD is intercepted user, comprising:
Report switching beginning incident to described monitor for police server, and carry the Base Station Identification that the user may switch to; And
Described monitor for police server reports described switching to begin incident to described law enforcement agency after receiving described switching beginning incident.
4. method according to claim 1 is characterized in that, described method further comprises, when the stage is finished in the switching of access business network grappling,
After successfully setting up data channel between purpose IAD and the grappling data channel DP, described grappling DP determines that handover success finishes, and judges whether the user who switches is intercepted user; And
In judged result is to be under the situation of intercepted user, report the incident of finishing of switching to described monitor for police server, and the Base Station Identification that described user has switched to reported described monitor for police server, and after described monitor for police server receives that incident is finished in described switching, report described switching to finish incident to described law enforcement agency.
5. method according to claim 4 is characterized in that, described method further comprises, after taking place to connect the switching of business network grappling,
Purpose grappling DP judges whether the user is intercepted user after receiving datapath function DPF handoff request message from former grappling DP;
In judged result is to be under the situation of intercepted user, report the connection business network to switch the beginning incident to described monitor for police server, and carry the purpose grappling DP sign that the user may switch to, and after described monitor for police server receives that described connection business network switches the beginning incident, report described connection business network to switch the beginning incident to described law enforcement agency.
6. method according to claim 5 is characterized in that, described method further comprises, when connecting business network grappling finishing switching,
Described former grappling DP judges whether the user is intercepted user after receiving DPF switching response message from described purpose grappling DP; And
In judged result is to be under the situation of intercepted user, report the connection business network to switch the incident of finishing to described monitor for police server, and carry the grappling DP sign that the user switched to, described monitor for police server reports described connection business network to switch the incident of finishing to described law enforcement agency after receiving that incident is finished in described connection business network switching.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101030893A (en) * | 2006-03-03 | 2007-09-05 | 中兴通讯股份有限公司 | Method for controlling realtime monitor service |
| CN101123639A (en) * | 2007-09-18 | 2008-02-13 | 中兴通讯股份有限公司 | A method for monitoring active events after office switching in call |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101030893A (en) * | 2006-03-03 | 2007-09-05 | 中兴通讯股份有限公司 | Method for controlling realtime monitor service |
| CN101123639A (en) * | 2007-09-18 | 2008-02-13 | 中兴通讯股份有限公司 | A method for monitoring active events after office switching in call |
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