WO2011020322A1

WO2011020322A1 - Switching method and apparatus for wimax system

Info

Publication number: WO2011020322A1
Application number: PCT/CN2010/071188
Authority: WO
Inventors: 庞在海; 刘俊羿
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-08-20
Filing date: 2010-03-22
Publication date: 2011-02-24
Also published as: CN101640877B; CN101640877A

Abstract

A switching method and apparatus for a Worldwide Interoperability for Microwave Access (WiMAX) system. The method performs an inner switching of a Serving Access Service Network(ASN) according to a channel after a cross-ASN switching, and includes the following steps: sending a Base Station Identity Code(BSID) of a Target Base station(BS) of the inner switching to a Data Path Function(DPF) of an Anchor ASN; updating the BSID of the BS where a user is located in into the BSID of the Target BS by the DPF of the Anchor ASN. The method and apparatus ensures effectively the consistency of the BSID of each net element of the same user in the ASN when the ASN inner switching is served after performing the cross-ASN switching, thereby improves the success rate of the WiMAX user performing the data business, therefore conquers the problem in the related technique that the user cannot perform the data business normally caused by the inconsistency of the BSID of each net element of the same user in the ASN in the switching method for the Worldwide Interoperability for Microwave Access system.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a handover method and apparatus for a microwave access global interoperability system. BACKGROUND With the development of mobile terminals and the widespread application of wireless technologies, 4 Worldwide Interoperability for Microwave Access (WiMAX) technology based on the IEEE 802.16 standard is developing rapidly. The outlook is getting wider and wider. Figure 1 shows the network architecture diagram of WiMAX, where the CSN (Connected Service Network) is connected to the monthly network, the MS/SS (Mobile Station/Subscriber Station) is the mobile terminal, and the ASN (Access Service Network) is connected to the system. Network network) For the set of corresponding message flows of the functional entities related to the access service in the WiMAX network system, each ASN is connected through the R4 port, and the NSP (Network Service Provider) is the network monthly service provider, NAP (Network Access) Provider) is a network access provider. ASP (Application Service Provider) is an application service provider. The solid line indicates the 7-carrier plane, and the dotted line indicates the control plane. Figure 2 shows the internal structure of the ASN. The AGW (ASN Gateway, ASN Convergence Gateway, or ASN-GW) and the BS (Base Station) are connected through the internal interface R6. The R6 port consists of a series of The Control Plane and Bearer Plane protocols are used. The AGW further includes an authentication authorization function entity (Authenticator), a channel management function entity DPF (Data Path Function), and a location management function entity PC/LR (Paging Control/Location Register), and the three functional entities may be in the same physical entity. It can also be on different physical entities.

The BS mainly provides functions such as radio resource management, power measurement and control, and compression and encryption of air interface data. The Authenticator in the AGW mainly provides authentication, authorization, and accounting functions. The DPF mainly provides channel management and assists the establishment of 3 layers between the upper layer and the MS. Connection and other functions, PC / LR mainly provides location management, paging and other functions; CSN mainly includes home agent HA (Home Agent), dynamic host configuration, DHCP (Dynamic Host Configuration Protocol) server, and recognition 功能 Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication Authentication The related art provides a handover method for a microwave access global interoperating system. The method performs processing in a handover process within a Serving ASN after an ASN handover. Referring to FIG. 3, the Serving ASN is a current serving ASN. The anchor ASN is the anchor ASN, the Serving BS is the current serving BS, and the Target BS is the target BS of the handover. The method includes the following steps: Step 302, the channel after the ASN handover, that is, the channel before the handover in the Serving ASN The channel is divided into two segments: 302 (a) and 302 (b). Step 304: Before the current handover, the DPFs in the Serving BS, the Target BS, and the Serving ASN perform message interaction, so that the Serving BS acquires user information. Step 306 The DPF in the Serving ASN updates the BSID (Base Station Identity Code) of the BS where the user is located to the BSID of the Target BS by switching the channel setup message; Step 308, the Authenticator in the Anchor ASN passes the CMAC (Control Mobile Attenuation Code, Controlling the mobile fading code) Key Count Update Proc Updates the BSID of the BS where the user is located to the BSID of the Target BS; Step 310, Serving established between the Target BS in the DPF and Serving ASN

The channel after switching within the ASN. The inventor has found that the handover method for the global interoperability system for microwave access in the related art has the following problems: The user performs handover across the ASN, that is, the BS in which it is located is switched from the Serving BS in the Serving ASN to the Target BS in the Serving ASN. In this process, the DPF in the Serving ASN and the Authenticator in the Anchor ASN both update the BSID of the BS where their respective users are located to the switched BSID (the BSID of the Target BS in the Serving ASN) through message interaction; and the Anchor ASN Since the DPF does not have any message interaction in the process of the handover, the BSID of the BS where the user is located is still the BSID before the handover (the BSID of the Serving BS in the Serving ASN), causing the same user to have different BSIDs of the network elements in the ASN. Therefore, the user cannot perform the problem of data service normally. SUMMARY OF THE INVENTION The present invention is directed to a handover method and apparatus for microwave access global interoperability systems, The problem that the BSIDs of the same user in the ASN are inconsistent in the switching method of the global interoperability system for the microwave access in the related art can be solved, thereby causing the problem that the user cannot perform the data service normally. In order to achieve the above object, according to an aspect of the present invention, a handover method for a microwave access global interoperability system is provided, and an intra-switching of a current service access service network is performed according to a channel that is switched after a cross-access service network, The method includes the following steps: sending a base station identification code of an intra-switched target base station to a channel management function entity of the anchor access service network; and a channel management function entity anchoring the access service network updating the base station identification code of the base station where the user is located to the target The base station identification code of the base station. Preferably, in the above handover method, the base station identifier of the target base station is carried in the Context

Send in the Rpt message. Preferably, in the foregoing handover method, the base station identity code of the target base station is carried in the Context Purpose Indicator field of the Context Rpt message for transmission. Preferably, in the foregoing handover method, the base station identification code of the target base station that transmits the intra-switching to the channel management function entity of the anchor access network includes: the channel management function entity of the current service access service network anchors The channel management function entity of the access service network sends a Context Rpt message, and the Context Purpose Indicator field of the Context Rpt message carries the base station identifier of the target base station. Preferably, in the foregoing handover method, the channel management function entity that anchors the access to the monthly service network updates the base station identification code of the base station where the user is located to the base station identification code of the target base station, and specifically includes: channel management of the anchor access service network. The function entity receives the Context Rpt message; the channel management function entity anchoring the access service network updates the base station identification code of the base station where the user is located to the base station identification code of the target base station according to the Context Purpose Indicator field in the Context Rpt message; anchoring The channel management function entity of the monthly service network sends a Context Ack message to the channel management function entity of the current service access service network. Preferably, in the foregoing handover method, the base station identification code of the target base station that transmits the intra-switching to the channel management function entity of the anchor access service network specifically includes: anchoring the authentication and authorization function entity of the access service network to anchor The channel management function entity of the access service network sends a Context Rpt message, and the Context Purpose Indicator field of the Context Rpt message carries the base station identifier of the target base station. Preferably, in the foregoing handover method, the channel management function entity that anchors the access to the monthly service network updates the base station identification code of the base station where the user is located to the base station identification code of the target base station, and specifically includes: channel management of the anchor access service network. The function entity receives the Context Rpt message; the channel management function entity anchoring the access service network updates the base station identification code of the base station where the user is located to the base station identification code of the target base station according to the Context Purpose Indicator field in the Context Rpt message; anchoring The channel management function entity of the monthly service network sends a Context Ack message to the authentication/acceptance function entity of the anchor access service network. In order to achieve the above object, according to another aspect of the present invention, a switching apparatus for a microwave access global interoperability system is provided, which is configured to perform a current service access service network according to a channel that is switched after a service network is switched across a service access network. The intra-switching includes: a sending module, configured to send, to a channel management function entity that anchors the access service network, a base station identifier of the target base station that is intra-switched; and an update module, which is used to anchor the channel management function entity of the access service network The base station identification code of the base station where the user is located is updated to the base station identification code of the target base station. Preferably, in the foregoing switching apparatus, the base station identification code of the target base station is carried in the Context Rpt message for transmission. Preferably, in the foregoing switching apparatus, the base station identifier of the target base station is carried in the Context Purpose Indicator field of the Context Rpt message for transmission. The foregoing embodiment first sends the BSID of the intra-switched Target BS to the DPF of the Anchor ASN, and then the DPF of the Anchor ASN updates the BSID of the BS where the user is located to the BSID of the intra-switching Target BS, so that the DPF of the Anchor ASN and the DPF in the Serving ASN, The Authenticator in the Anchor ASN is consistent, and the BSID of the target BS is internally switched. This ensures that the BSID of the same user in the ASN is consistent when the intra-ASN handover is performed within the Serving ASN. The success rate of the data service of the WiMAX user is overcome. Therefore, the BSID of the same user in the ASN is inconsistent in the handover method of the global interoperability system for the microwave access in the related art, and the user cannot perform the data service normally. The problem. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: Figure 1 shows a network architecture diagram of WiMAX; 2 shows an internal structure diagram of an ASN; FIG. 3 shows a flowchart of a handover method in the related art; FIG. 4 shows a flowchart of a handover method according to the first embodiment of the present invention; A flowchart of a handover method according to a second embodiment of the present invention; FIG. 6 is a flowchart showing a handover method according to a third embodiment of the present invention; FIG. 7 shows a fourth embodiment of the present invention. A structural diagram of the switching device. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in conjunction with the embodiments. 4 is a flowchart of a handover method according to a first embodiment of the present invention, which is performed by performing intra-AS handover of a Serving ASN according to a channel after a cross-ASN handover, and includes the following steps: Step S402: Sending to a DPF of an Anchor ASN The BSID of the Target BS that is intra-switched; Step 4: S404, the DPF of the Anchor ASN updates the BSID of the BS where the user is located to the BSID of the Target BS. The foregoing embodiment first sends the BSID of the intra-switched Target BS to the DPF of the Anchor ASN, and then the DPF of the Anchor ASN updates the BSID of the BS where the user is located to the BSID of the intra-targeting Target BS, so that the DPF of the Anchor ASN and the DPF in the Serving ASN, The Authenticator in the Anchor ASN is consistent, and the BSID of the target BS is internally switched. This ensures that the BSID of the same user in the ASN is consistent when the intra-ASN handover is performed within the Serving ASN. The success rate of the data service of the WiMAX user is overcome. Therefore, the BSID of the same user in the ASN is inconsistent in the handover method of the global interoperability system for the microwave access in the related art, and the user cannot perform the data service normally. The problem. Preferably, in the above handover method, the BSID of the Target BS is carried in a Context Rpt (Content Update) message for transmission. Since the Context Rpt message is an existing message, the technical solution used by the present embodiment to notify the APF of the Anchor ASN to update the BSID is simple and easy. Preferably, in the foregoing handover method, the BSID of the Target BS is carried in the Context Purpose Indicator field of the Context Rpt message for transmission. This embodiment is directed to Anchor ASN When the DPF sends the BSID of the Target BS, the Context Rpt message needs to be modified, for example, by using the Context Purpose Indicator field, and the Context Purpose Indicator field is an indication bit, which is originally used to indicate the Context Rpt, and the embodiment uses the remaining unused. One of the bits is used to carry the BSID of the Target BS to indicate that the DPF of the Anchor ASN performs the update of the BSID. Preferably, in the foregoing handover method, step S402 specifically includes: sending, by the DPF of the Serving ASN, a Context Rpt message to the DPF of the Anchor ASN, where the Context Purpose Indicator field of the Context Rpt message carries the BSID of the Target BS. In this embodiment, the DPF of the Serving ASN sends the BSID of the Target BS to the DPF of the Anchor ASN, and the update indication of the BSID is carried in the Context Purpose Indicator field in the Context Rpt message. According to the step 306 of the related art, the DPF of the Serving ASN updates the BSID of the BS where the user is located to the BSID of the Target BS by using the handover channel establishment message. Therefore, the DPF of the Serving ASN is used to notify the DPF of the Anchor ASN to update the BSID. The technical solution is effective to ensure the correct '1' of the update indication obtained by the DPF of the Anchor ASN at this time. Preferably, in the foregoing handover method, the step S404 specifically includes: the DPF of the Anchor ASN receives the Context Rpt message; the DPF of the Anchor ASN The BSID of the BS where the user is located is updated to the BSID of the Target BS according to the Context Purpose Indicator field in the Context Rpt message; the DPF of the Anchor ASN sends a Context Ack (Content Response) message to the DPF of the Serving ASN. In this embodiment, the Anchor ASN After the Context Rpt message from the DPF of the Serving ASN, the BSID of the BS where the user is located is updated to the BSID of the Target BS, and a Context Ack message is sent to the DPF of the Serving ASN to inform the DPF of the Serving ASN that the BSID has been completed. This makes the DPF of the Serving ASN aware that the DPF of the Anchor ASN has completed the BSID update, improving the reliability of the BSID update. FIG. 5 is a flowchart of a handover method according to a second embodiment of the present invention. The method includes the following steps: Step 502: A channel that is switched after the ASN is switched, that is, a channel before the handover in the Serving ASN. The channel is divided into two segments 502 (a) and 502 (b); Step 504, before the handover, in the Serving BS, the Target BS, and the Serving ASN The DPF performs message interaction, so that the Serving BS acquires the user information. Step 506: The DPF in the Serving ASN updates the BSID of the BS where the user is located to the BSID of the Target BS by switching the channel setup message. Step 508: The DPF in the Serving ASN is switched in step 506. The message ID of the BS in which the current user is located is obtained, and the BSID is sent to the DPF in the Anchor ASN by sending a Context Rpt message, and the Context Purpose Indicator in the message carries the update indication of the BSID; Step 510, the DPF in the Anchor ASN is received. After the Context Rpt message indicating the BSID update, the BSID of the BS where the user is located is updated, and the Context Ack message indicating that the BSID is updated is sent to the DPF in the Serving ASN to notify that the BSID has been updated; Step 512, the Authenticator in the Anchor ASN passes the CMAC Key Count Update Proc updates the BSID of the BS where the user is located to the BSID of the Target BS; Step 514, establishes the Serving between the Target BS and the DPF in the Serving ASN.

The channel after switching within the ASN. Preferably, in the foregoing handover method, step S402 specifically includes: Anchor ASN

The Authenticator sends a Context Rpt message to the DPF of the Anchor ASN. The Context Purpose Indicator field of the Context Rpt message carries the BSID of the Target BS. In this embodiment, the Authenticator of the Anchor ASN sends the BSID of the Target BS to the DPF of the Anchor ASN, and the update indication of the BSID is carried in the Context Purpose Indicator field in the Context Rpt message. As shown in step 306 of the related art, the Authenticator of the Anchor ASN updates the BSID of the BS where the user is located to the BSID of the Target BS by using the handover channel establishment message. Therefore, the Authenticator of the Anchor ASN notifies the APF of the Anchor ASN to update the BSID. The technical solution effectively ensures the correctness of the update indication obtained by the DPF of the Anchor ASN at this time. Preferably, in the foregoing handover method, step S404 specifically includes: the DPF of the Anchor ASN receives the Context Rpt message; the DPF of the Anchor ASN updates the BSID of the BS where the user is located to the Target BS according to the Context Purpose Indicator field in the Context Rpt message. BSID; The ADF of the Anchor ASN sends a Context Ack message to the Authenticator of the Anchor ASN. In this embodiment, when the DPF of the Anchor ASN is connected to the Anchor ASN. After the Context Rpt message of the Authenticator, the BSID of the BS where the user is located is updated to the BSID of the Target BS, and a Context Ack message is sent to the Authenticator of the Anchor ASN, so that the Authenticator of the Anchor ASN has completed the update of the BSID. In this way, the Authenticator of the Anchor ASN learns that the DPF of the Anchor ASN has completed the update of the BSID, thereby improving the reliability of the BSID update. FIG. 6 is a flowchart of a handover method according to a third embodiment of the present invention. The method includes the following steps: Step 602: A channel that is switched after the ASN is switched, that is, a channel before the handover in the Serving ASN. The channel is divided into two segments 502 ( a ) and 502 ( b ); Step 604, before the handover, in the Serving BS, the Target BS, and the Serving ASN

The DPF performs message interaction, so that the Serving BS acquires the user information. Step 606: The DPF in the Serving ASN updates the BSID of the BS where the user is located to the BSID of the Target BS by switching the channel setup message. Step 608, the Authenticator in the Anchor ASN passes the CMAC Key Count. Update Proc updates the BSID of the BS where the user is located to the BSID of the Target BS. Step 610, the Authenticator in the Anchor ASN obtains the BSID of the BS where the current user is located, and sends a Context Rpt message to the Authenticator in the Step 4 504 CMAC Key Count Update Proc process. The DPF in the Anchor ASN, the Context Purpose Indicator in the message carries the update indication of the BSID. Step 4 is 612. After the DPF in the Anchor ASN receives the Context Rpt message indicating the BSID update, the BSID of the BS where the user is located is updated, and the BSID update is sent. The Context Ack message informs the Authenticator in the Anchor ASN that the BSID has been updated; Step 614, establishing the Serving between the Target BS and the DPF in the Serving ASN.

The channel after switching within the ASN. FIG. 7 is a structural diagram of a switching apparatus according to a fourth embodiment of the present invention, where the apparatus is configured to perform intra-switching of the Serving ASN according to the channel after the ASN switching, and includes: a sending module 702, configured to the Anchor The DSF of the ASN sends the BSID of the Target BS that is intra-switched; The update module 704, the DPF for the Anchor ASN updates the BSID of the BS where the user is located to the BSID of the Target BS. The foregoing embodiment firstly uses the sending module 702 to send the BSID of the intra-switched Target BS to the DPF of the Anchor ASN, and then the DPF 更新 update module 704 of the Anchor ASN updates the BSID of the BS where the user is located to the BSID of the intra-switching Target BS, so that the Anchor The DPF of the ASN is the same as that of the APF in the Serving ASN and the Authenticator in the Anchor ASN. Both are the BSIDs of the internal handover Target BS, which effectively ensures that the same user is in the ASN when switching within the Serving ASN after the ASN handover. The BSID of the network element is consistent, which improves the success rate of the data service of the WiMAX user. Therefore, the BSID of each network element of the same user in the ASN in the handover method for the global interoperability of the microwave access in the related art is overcome. Inconsistent, resulting in users not being able to properly perform data services. Preferably, in the foregoing switching apparatus, the BSID of the Target BS is carried in the Context Rpt message for transmission. Since the Context Rpt message is an existing message, the technical solution used by the present embodiment to notify the APF of the Anchor ASN to update the BSID is simple and easy. Preferably, in the foregoing switching apparatus, the BSID of the Target BS is carried in the Context Purpose Indicator field of the Context Rpt message for transmission. In this embodiment, when the BSID of the Target BS is sent to the DPF of the Anchor ASN, the Context Rpt message needs to be modified, for example, by using the Context Purpose Indicator field, and the Context Purpose Indicator field is an indication bit, which is originally used to indicate the Context Rpt, An embodiment uses one of the remaining unused bits for carrying the BSID of the Target BS to indicate that the DPF of the Anchor ASN is performing the BSID update. From the above description, it can be seen that the foregoing embodiment of the present invention effectively ensures the consistency of the BSID of each network element of the same user in the ASN when the intra-ASN handover is performed within the Serving ASN, thereby improving the WiMAX. The success rate of the user's data service. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A handover method for a global interoperability system for microwave access, characterized in that: the intra-office handover of the current monthly service access network is performed according to the channel after the cross-access to the monthly service network, including The following steps are 4:

Transmitting, to the channel management function entity that anchors the access network, the base station identification code of the target base station that is intra-switched;

The channel management function entity updates the base station identification code of the base station where the user is located to the base station identification code of the target base station.

The handover method according to claim 1, wherein the base station identification code of the target base station is carried in a Context Rpt message for transmission.

The handover method according to claim 1, wherein the base station identification code of the target base station is carried in a Context Purpose Indicator field of a Context Rpt message for transmission.

The handover method according to claim 1, wherein the transmitting the base station identification code of the target base station to the channel management function entity of the anchor access network includes: The channel management function entity of the current monthly service access network sends a Context Rpt message to the channel management function entity of the anchor access service network, where the Context Purpose Indicator field of the Context Rpt message carries the target base station Base station identification code.

The handover method of claim 4, wherein the channel management function entity of the anchor access service network updates the base station identification code of the base station where the user is located to the base station identification code of the target base station, including:

The channel management function entity of the anchor access service network receives the Context Rpt message;

The channel management function entity of the anchor access service network updates the base station identification code of the base station where the user is located to the base station identification code of the target base station according to the Context Purpose Indicator field in the Context Rpt message;

The channel management function entity anchored to the monthly service network sends a Context Ack message to the channel management function entity of the current monthly service access service network.

The handover method according to claim 1, wherein the transmitting the base station identification code of the target base station to the channel management function entity of the anchor access service network comprises: the anchor connection The Authenticated Authorization Function Entity of the Incoming Access Network sends a Context Rpt message to the channel management function entity of the anchor access service network, where the Context Purpose Indicator field of the Context Rpt message carries the base station identification code of the target base station.

The handover method according to claim 6, wherein the channel management function entity of the anchor access service network updates the base station identification code of the base station where the user is located to the base station identification code of the target base station, including:

The channel management function entity of the anchor access service network sends a Context Ack message to the authentication authorization function entity of the anchor access service network.

8. A switching device for a microwave access global interoperability system, characterized in that the method is used for performing intra-switching of a current service access service network according to a channel switched across a service network, including:

a sending module, configured to send, to a channel management function entity that is anchored to the monthly service network, a base station identifier of the target base station that is internally switched;

And an update module, configured to update a base station identification code of the base station where the user is located to a base station identification code of the target base station.

The handover apparatus according to claim 8, wherein the base station identification code of the target base station is carried in a Context Rpt message for transmission.

10. The switching apparatus according to claim 8, wherein the base station identification code of the target base station is carried in a Context Purpose Indicator field of a Context Rpt message for transmission.