CN100461944C

CN100461944C - Method for realizing activated state switching between ANs in HRPD network

Info

Publication number: CN100461944C
Application number: CNB2005100771132A
Authority: CN
Inventors: 高全中; 何清容; 李志明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-05-16
Filing date: 2005-06-14
Publication date: 2009-02-11
Anticipated expiration: 2025-06-14
Also published as: CN1867167A

Abstract

The invention relates to a method for switching between activated AN in HRPD network. Wherein, said invention comprises: assuring the access networks AN need switch operation; then starting the switch operation, to switch between AN; in the switch process, advanced sending the data sent to the terminal to the switched target AN; then, according to the switched result, the original or target AN sends the data that sent to the terminal in the switch process to the terminal. Therefore, the invention can improve the service continuity; even the AN switch is failure, since the original PCF receives the data of PDSN all the time in the switch process, the PCF is able to send data when the switch process has been started and the terminal is back to the original AN.

Description

Method for realizing active state AN switching in HRPD network

Technical Field

The invention relates to the technical field of communication, in particular to a method for realizing switching between activated state ANs in AN HRPD network.

Background

With the development of communication technology, in order to solve the bottleneck problem on the air interface in the CDMA system, 3GPP2 (international organization for standardization of third generation mobile communication) issued a standard of HRPD (HRPD-high rate Packet Data) network technology. The main purpose is to increase the data transmission rate of the radio interface, which can provide forward data rates up to 2.4Mbit/s compared to 153.6kbit/s for cdma20001 x.

In the HRPD network, new modulation technology is adopted on the air interface by the HRPD network, and methods such as data rate control, scheduling optimization, time division multiplexing and the like are added, so that the data transmission rate on the air interface is greatly improved. The HRPD technology can adopt a special data channel to support high-speed packet data service on a CDMA carrier frequency (1.25MHz), the forward highest data rate can reach 2.4576Mbit/s, and the reverse direction supports the peak data rate of a single user of 153.6 kbit/s.

When HRPD network deployment is carried out, an independent carrier frequency is required to support HRPD. This makes it possible for a user terminal to move from one AN to another AN in the HRPD network when the user terminal moves in the HRPD network, and at this time, a handover process from the source AN to the destination AN is required.

Currently, in the 3GPP2 standard, handover in Dormant state between ANs (access networks) is only supported, and the corresponding handover process specifically includes: when a terminal develops data service in AN HRPD (high rate packet data) network and moves to a cell coverage edge zone, the terminal needs to be switched to another AN to continue to develop the data service, and at the moment, the system switches the packet data service from AN activated state to a Dormant state in a source AN and then switches the packet data service to a target AN in the Dormant state; after entering the destination AN, the system switches the packet data service from Dormant state to active state again at the destination AN.

The above-mentioned switching manner between ANs can realize the switching operation from the source AN to the destination AN. However, for data services with high real-time requirements, such as VoIP (voice over IP), Video Phone, PTT (push to talk), streaming media, etc., if the above switching process is adopted, service interruption is likely to occur, which seriously affects the use of the service by the user.

That is, in the current standard method for implementing dormant handoff between AN and PCF, in the handoff process, the PPP (point-to-point protocol) connection in use needs to be released, and the PDSN needs to allocate a new PPP connection to the destination network. In the process of reallocating the PPP connection, on one hand, the newly-allocated PPP connection may cause failure in the allocation process due to reasons such as resource problems, so that the user service is interrupted; on the other hand, the PDSN needs a certain time to reestablish a PPP connection, and therefore, a relatively large delay effect is also caused to the current service of the user.

For this reason, it is necessary to provide a hard handoff process that can ensure uninterrupted service during handoff between ANs. However, in the current standard, only the above-mentioned dormant inter-AN handoff processing procedure is implemented, and the active hard handoff procedure between the HRPD system AN and the PCF is not defined.

Disclosure of Invention

In view of the above problems in the prior art, AN object of the present invention is to provide a method for implementing AN active inter-AN handover in AN HRPD network, so as to ensure service continuity when a user terminal is handed over AN and a PCF, and fallback after a handover failure, thereby improving reliability of service communication.

The purpose of the invention is realized by the following technical scheme:

the invention provides a method for realizing the switching between activated ANs in AN HRPD network, which comprises the following steps:

A. determining that switching operation needs to be carried out between access networks AN, and starting a switching process;

B. performing switching processing between ANs, establishing connection between a target AN and a packet data service network PDSN in advance in the switching process, and sending user data to the target AN/packet control function PCF by the PDSN;

C. when the terminal completes the connection establishment with the destination AN, the data which has been received from the PDSN is transmitted from the destination AN/PCF to the terminal.

The step A comprises the following steps:

a1, source AN determines the need of switching between ANs according to the received route updating message, and determines the corresponding destination AN;

a2, source AN sends switching request message to destination AN.

In the present invention, when switching between ANs belonging to different PCFs, said step B comprises:

b1, after receiving the switch request message from source AN, the target AN sends a connection establishment request to the target PCF, and establishes the connection between the target AN and the target PCF, meanwhile, the target PCF also needs to register to the packet data service network PDSN, and establishes the connection between the PCF and the PDSN;

b2, PDSN only sends data to source PCF, waits for source PCF to request stop sending data, then sends data to target PCF and stops sending data to source PCF;

after the connection between PCF and PDSN is established, data is sent to the target AN/PCF;

or,

when PCF and PDSN connection is established, PDSN sends double-broadcast indication message to source AN to inform data behind source AN/PCF to send to target PCF/AN at the same time, and PDSN sends data to source AN/PCF at the same time.

The step B1 further includes:

and when the PDSN determines that the connection between the PCF and the PDSN is switched between the ANs according to the existing connection condition between the PCF and the PDSN, the double-broadcasting indication message is sent.

The step B also comprises the following steps:

b3, source AN sends channel assignment message to terminal according to the switch response message sent by target AN, and waits for the terminal to respond and then to remove the empty interface connection with the PCF through interactive information indication, or sends channel assignment message and then directly removes the empty interface connection with the PCF through interactive information indication without waiting for the terminal to respond.

The step B3 includes:

b31, source AN sends channel assignment message to terminal, terminal switches to target AN, and target AN distributes management access terminal identification UATI for terminal, completes UATI assignment;

b32, establishing AN air interface connection of the target AN by the mutual information between the target AN and the PCF, and immediately sending data to the terminal by the target AN when the air interface connection is successfully established;

or,

b33, source AN sends UATI assignment message to terminal, when UATI assignment is completed, source AN sends service channel assignment message to terminal and completes channel assignment process;

b34, exchanging information between the target AN and the target PCF to establish the empty connection of the target AN, and when the empty connection is established, the target AN immediately sends data to the terminal.

The step B also comprises the following steps:

when the air interface connection of the source AN is confirmed to be removed, the source PCF sends a message of stopping sending data to the PDSN, and the PDSN is required to stop sending data to the PDSN;

after receiving the message of stopping sending data sent to the PDSN by the source PCF, if the data is not sent to the target PCF, the PDSN starts to send data to the target PCF while stopping sending data to the source PCF.

The step B also comprises the following steps:

when the terminal completes the connection establishment with the target AN, the target AN or PCF sends data to the terminal.

When the terminal can receive data through the target AN, the target AN sends a switching process completion message to the source AN;

after receiving the message, the source AN interacts information with the PCF and releases the connection between the source AN and the PCF.

The step B comprises the following steps:

for switching between ANs under different PCFs, the packet data service network PDSN sends data to be sent to the terminal to the source PCF to which the source AN belongs and the destination PCF to which the destination AN belongs at the same time.

The step B also comprises the following steps:

and respectively storing the data to be transmitted to the terminal in the base station systems BTS corresponding to the source AN and the target AN.

The method for realizing the switching between the activated ANs in the HRPD network also comprises the following steps:

when the process of switching from the source AN to the target AN is successful, the target AN or the target PCF sends the data which needs to be sent to the terminal in the switching process to the terminal;

when the process of switching from the source AN to the target AN fails, the source AN and the source PCF send the data which needs to be sent to the terminal in the switching process to the terminal.

In the present invention, the data includes:

real-time traffic data and non-real-time traffic data.

the source AN does not send the real-time service packet after receiving the double-broadcasting indication, and continues to send the non-real-time service packet.

It can be seen from the above technical solutions that the present invention realizes hard handoff between PCFs, and in the process of hard handoff between PCFs, the PDSN sends data to the destination PCF/AN in advance; it is ensured that data can be sent from the destination AN or PCF to the terminal immediately after the terminal has completed the connection setup with the destination AN. Therefore, the continuity of the service can be improved, and the time delay and the packet loss caused by the time delay are reduced; if the switch fails, the source PCF still sends the data after the switch is started to the source PCF, and the packet loss caused by AN switch is avoided.

Or when the target AN/PCF and the PDSN establish connection, the PDSN sends the concurrency indication information to the source PCF/AN, and waits for receiving the response of the source PCF/AN, the PDSN starts to simultaneously send data to the target PCF and the source PCF, and the target PCF caches the data in the switching process. The source PCF also caches the data after receiving the double-broadcasting indication for the rollback after the switching failure, thereby improving the reliability. The terminal can send data from the destination AN or PCF to the terminal immediately after the connection setup with the destination AN is completed.

Drawings

Fig. 1 is a schematic diagram of a networking structure of an HRPD network;

FIG. 2 is a flowchart 1 of AN inter-AN hard handoff between PCFs in the method of the present invention;

fig. 3 is a flow chart 2 of inter-AN hard handoff between PCFs in the method of the present invention.

Detailed Description

The core of the invention is that in the process of switching the AN, corresponding data information is sent to the target AN in advance, and the data can be stored in the target AN, PCF to which the target AN belongs, or other BTS (base station system) corresponding to the target AN, thereby ensuring the connectivity of the service after the switching process is finished. Meanwhile, the data can be sent to the source AN/PCF at the same time and stored by the source AN/BTS/PCF, so that the continuity of receiving the data by the user terminal can be ensured no matter whether the switching is successful, and the user terminal can be AN MS (Mobile station) and the like.

Generally, as shown in fig. 1, in AN HRPD network, a terminal AT communicates with AN access network AN through AN air interface AL, a source AN communicates with a PCF through interfaces A8 and a9, and the PCF communicates with the PDSN through interfaces a10 and a11, so that the AT can obtain a data service sent by the PDSN through the AN and the PCF.

The method mainly comprises the following steps in the implementation process:

in the hard switching process between the ANs of PCFs, when the target AN and the target PCF establish A8 and the target PCF and the PDSN establish A10 connection (A10 connection is the connection between the PCF and the PDSN), the PDSN automatically judges whether to send the double-broadcasting indication message according to whether the A10 connection already exists;

when PCFs are switched, after A8 and A10 are established among the target AN, the target PCF and the PDSN, the PDSN sends data to both the source PCF and the target PCF, so that the time delay and packet loss of the target AN/PCF are reduced; meanwhile, before sending data, the PDSN informs the source PCF, the destination AN/PCF can also receive the following data after receiving the notification, if the switching is successful, the source AN/PCF does not send the following received data to the terminal, and only when the switching is failed, the source AN/PCF continues to send the data which is not overtime.

Or after the AN sends the service channel assignment (or receives the response of the message) to the terminal, the AN requests the PDSN to stop sending the service data to the source PCF and sends the service data to the target PCF in advance.

In the processing process provided by the invention, the PDSN can determine according to the service option, for the delay sensitive service, namely when the delay requirement meets the set requirement, the PDSN sends data to the source PCF and also sends data to the destination PCF after completing the establishment of A8 and A10 among the destination AN, the destination PCF and the PDSN in the process of switching among PCFs;

meanwhile, in the method of the present invention, during the switching of the AN, in order to reduce the time delay, the data received by the target AN can be directly sent to the BTS (base station system) in the AN for buffering, and the data received by the source AN can also be sent to the BTS for buffering.

The destination AN receives a channel assignment completion message or a UATI completion message sent by the terminal, and immediately sends data to the terminal;

in the scenario depicted in fig. 2, the source PCF may choose to send an Xoff (stop sending data) message to the PDSN after sending the traffic channel assignment message to the terminal, requiring the PDSN to stop sending data to save bandwidth. Or the Xoff message is not sent, so that the rollback of the switching failure is facilitated;

the method of the invention can meet the transmission requirements of real-time service and non-real-time service in HRPD network.

In practical applications, the present invention provides a process of hard handoff between ANs in the case of Inter-PCF (Inter-packet control function), i.e., a process of hard handoff between ANs between PCFs, which will be described below.

The Inter-AN/Inter-PCF provided by the present invention, i.e. the hard handoff process between ANs among different PCFs, as shown in fig. 2, specifically includes the following steps:

step 21: the AT sends a routing update message to the source AN, wherein the routing update message comprises neighbor cell information with higher signal strength;

step 22: the source AN determines that hard switching is needed according to the routing update message, and then sends a switching request message to the target AN, wherein the message comprises session information related to the AT;

step 23: after receiving the switching request message, the target AN verifies the message and authenticates the AT; if the verification is passed, an A8 connection is established with the destination PCF, and a timer TA8-Setup is started. The message in which A8 is established may add an indication requesting the PDSN to send data to the destination PCF in advance.

Step 24: after receiving the a9-Setup-A8 message, the destination PCF initiates the establishment of a10 connection to the PDSN (packet data service network), i.e. sends a registration request message to the PDSN, requesting the PDSN to send data to the destination PCF in advance, or can add a new message to indicate.

Step 25: after the connection of A10 is established, the PDSN responds to the A11 Registration response message, namely an A11-Registration Reply message, to the destination PCF;

step 26: the destination PCF establishes the A8 connection, feeds back a connection message between the a9 interface and the A8 interface, i.e., AN a9-Connect-A8 message to the destination AN, and the destination AN stops the timer TA 8-Setup.

Step 27: the PDSN sends a bi-cast Indication message to the source PCF indicating the destination AN/PCF and the source AN/PCF that the data is to be sent by the PDSN at the same time. .

Step 28: PCF sends bi-cast Indication to source AN after receiving bi-cast Indication message, informing source AN still receiving data from PCF, source AN needs to continue sending non-real time service data to terminal after receiving bi-cast Indication, and only needs to send data before receiving bi-cast Indication message to terminal for received real time service data; unless the switching fails, the source AN does not send the real-time service data received from the PCF after receiving the double-broadcasting indication message to the terminal;

after confirming that the source AN receives the double-broadcasting instruction, for the data packet received by the source AN after receiving the double-broadcasting instruction, the real-time service data packet is not sent to the terminal any more, and for the non-real-time service data packet, the non-real-time service data packet is sent to the terminal continuously;

meanwhile, in the step, AN answer PDSN mechanism can be selected, and AN answer mechanism can be added between the PCF and the AN to ensure the reliability of the signaling transfer.

Step 29: after finishing sending the double-broadcasting indication, the PDSN can determine whether to send forward data to the target PCF according to the service attribute; or the forward data can be sent to the target PCF without being unified according to the service attributes, the target PCF stores the data from the PDSN, and the data is sent to the terminal immediately after the connection between the target AN and the terminal is established;

step 210: after finishing sending the indication, the PDSN sends forward data to the source PCF at the same time, and the data can be stored on the source PCF or sent to the source AN all the time and stored by the source AN;

step 211: the target AN sends a switching request response message to the source AN, wherein the message comprises channel parameters and the like distributed by the target AN;

step 215: after the source AN receives the switching request response message, the source AN sends a channel assignment message to the AT in a service channel to indicate the AT to switch to the target AN;

step 212: meanwhile, the source AN sends a message of disconnecting the connection between the A9 and the AL interface to the source PCF, namely, AN A9-AL-Disconnected message, so that the source PCF stops sending data to the source AN; that is, the source PCF directly sends a message of disconnecting the connection between the a9 and the AL interface, that is, AN a9-AL-Disconnected message, to the source PCF without waiting for the response of the traffic channel assignment message, so that the source PCF stops sending data to the source AN;

or:

after receiving the response of the service channel assignment message, the source AN sends a message for disconnecting the connection between the A9 and the AL interface to the source PCF, namely, AN A9-AL-Disconnected message is sent, so that the source PCF stops sending data to the source AN;

step 213: the source PCF responds to the source AN to disconnect the connection confirmation message between the A9 and the AL, namely AN A9-AL-Disconnected Ack message to the source AN and stops sending data to the source AN;

step 214: the source PCF sends an Xoff message to the PDSN, namely a data sending stopping message, and requests the PDSN to stop sending data to the PCF, which indicates that the switching is executed;

the step is optional, if the message is sent, the communication resource of the interface A can be saved, if the message is not sent, although the occupation amount of the resource of the interface A is increased, if the switching fails, the data can not be lost.

Step 216: after the AT is switched to the target AN, sending a channel assignment completion message to the target AN;

step 217: the target AN sends UATI assignment information to the AT on a service channel and allocates a new UATI for the AT;

step 218: after receiving the UATI completion message, the AT returns the UATI completion message to the target AN in a service channel;

step 219: the switching is successful, the session between the terminal AT and the PDSN is activated, and the target AN sends data to the terminal AT;

this step may be specifically performed at any time after step 218 is performed, with the principle being that faster is better;

step 220: the destination AN sends AN A9-AL Connected message indicating that the channel has been activated;

step 221: the destination PCF sends a Registration message, namely an A11-Registration Request message to the PDSN to indicate that the link is activated, and the PDSN returns a response of a Registration response to the PCF;

if step 214 is not performed or XOff is lost, the PDSN will stop sending data to the source AN/PCF at this point;

step 222: the destination PCF responds to the connection confirmation message between A9 and AL, namely AN A9-AL-ConnectedACK message to the destination AN;

step 223: the target AN sends a switching completion message to the source AN;

step 224: after receiving the switching completion message, the source AN sends AN A9-Release-A8 message to the source PCF to inform the PCF to Release the connection between the A9 interface and the A8 interface, and simultaneously, on the source AN, a timer TArel9 is started to Release AN A8 link;

step 225: after receiving the A9-Release-A8 message of the original AN, the source PCF sends AN A11-Registration Request message to the PDSN, and releases the A10 connection; after releasing the A10 connection, the PDSN returns an A11-Registration Reply message to the source PCF, and the source PCF releases A10 connection resources;

step 226: the source PCF releases the A8 connection, responds to the a9-Release-A8 complete (Release of the connection between a9 and A8 is completed) message to the source AN, and stops the timer TArel9 after receiving the message.

The processing procedures of steps 215, 216, 217 and 218 described above in conjunction with fig. 2 can also be implemented by the following specific processing procedures:

after the above step 211 is executed, step 215' is executed;

step 215': the source AN sends UATI assignment information to the AT on a service channel, and allocates a new UATI for the AT, wherein the new UATI is allocated by the target AN and carried to the source AN through a switching request response message;

step 216': AT returns UATI completing information to source AN in service channel;

step 217': the source AN sends channel assignment information to the AT in a service channel and switches to the target AN;

after step 217', step 212 may be directly performed, or step 212 may be performed after a response message of channel assignment returned by the AT is received;

after completing step 214, go to step 218;

step 218': after the AT is switched to the target AN, a channel assignment completion message is sent to the target AN in AN access channel.

In the actual application process, the two corresponding processing processes can be selected and applied according to requirements.

The present invention also provides another specific processing procedure for Inter-AN/Inter-PCF hard handoff, as shown in fig. 3, specifically comprising the following steps:

step 31: the AT sends a routing update message to the source AN, wherein the routing update message comprises neighbor cell information with high signal strength;

step 32: the source AN determines that hard switching is needed according to the routing update message, and then sends a switching request message to the target AN, wherein the message comprises session information related to the AT;

step 33: after receiving the switching request message, the target AN verifies the message and authenticates the AT; if the verification is passed, an A8 connection is established with the destination PCF. And starts timer TA 8-Setup.

Step 34: after receiving the A9-Setup-A8 message, the destination PCF initiates the establishment of A10 connection to the PDSN, i.e. the destination PCF sends a registration message to the PDSN;

step 35: after the connection of A10 is established, the PDSN responds to the destination PCF with an A11-registration reply message;

step 36: the destination PCF completes the A8 connection, feeds back AN A9-Connect-A8 message to the destination AN, and the destination AN stops the timer TA 8-Setup.

Step 37: the target AN sends a switching request response message to the source AN, wherein the message comprises channel parameters and the like distributed by the target AN;

when the source AN receives the handover request response message, step 312 needs to be executed to perform traffic channel assignment processing; meanwhile, step 38 needs to be executed to perform the release processing of the connection between a9 and AL, and of course, step 38 may also be executed after receiving the response message of channel assignment returned by the AT;

step 38: the source AN sends A9-AL-Disconnected (the connection between A9 and AL is Disconnected) to the source PCF, and the source PCF is informed to stop sending data to the source AN;

step 39: the source PCF responds to the A9-AL-Disconnected Ack (the connection between the A9 and the AL is Disconnected) message to the source AN and stops sending data to the source AN;

step 310: the source PCF sends an Xoff message to the PDSN to request to stop sending data, namely, stop sending data messages, and requires the PDSN to stop sending data to the source PCF, which indicates that the switching is executed;

step 311: after receiving the message, the PDSN stops sending data to the source AN end and sends data to the destination PCF, and the data can be sent to the destination AN all the time.

Step 312: the source AN sends channel assignment information to the AT in a service channel and indicates the AT to switch to the target AN;

the AT may return AN acknowledgement to the source AN acknowledging completion of the assignment process, but the AT acknowledgement is AN optional operation and is not a necessary step to perform;

step 313: after the AT is switched to the target AN, sending a channel assignment completion message to the target AN in AN access channel;

step 314: the destination AN sends UATI assignment information to AT in the access channel, and allocates a new UATI for the AT;

step 315: after receiving the UATI assignment completion message, the AT returns the UATI assignment completion message to the target AN in a service channel;

step 316: after the handover is successful, the session between the terminal AT, such as AN MS (mobile station), and the PDSN is activated, i.e. the terminal can receive data through the destination AN;

this step may be performed at any time after step 314, the rule being as fast as possible;

step 317: the destination AN sends a message for establishing the connection between the A9 and the AL interface to the destination PCF, namely, the A9-AL Connected message is sent to indicate that the channel is activated;

step 318: the destination PCF sends an a11-Registration Request message to the PDSN indicating that the link has been activated, and the PDSN returns a Registration response reply message to the destination PCF.

Step 319: the destination PCF responds to the A9-AL-Connected ACK (connection confirmation between A9 and AL) message to the destination AN;

step 320: the target AN sends a switching completion message to the source AN;

step 321: after receiving the handover complete message, the source AN sends AN A9-Release-A8 (connection between A9 and A8 is released) message to the source PCF, starts a timer TArel9 at the local end, and releases AN A8 link;

step 322: after receiving A9-Release-A8 message of source AN, source PCF sends A11-Registration Request message to PDSN to Request to Release A10 connection; after releasing the A10 connection, the PDSN returns an A11-Registration Reply message to the source PCF, and the source PCF releases A10 connection resources;

step 323: after the source PCF releases the A8 connection, the source AN stops the timer TArel9 in response to AN a9-Release-A8 Complete (Release of the connection between a9 and A8 is Complete) message.

The processing procedures of steps 312, 313, 314 and 315 described above in conjunction with fig. 3 can also be implemented by the following specific implementation procedures:

after step 37 is performed, step 312' is performed;

step 312': the source AN sends UATI assignment information to the AT on a service channel, and allocates a new UATI for the AT, wherein the new UATI is allocated by the target AN and carried to the source AN through a switching request response message;

step 313': AT returns UATI assignment completion message to source AN in service channel;

step 314': the source AN sends channel assignment information to the AT in a service channel and switches to the target AN;

after step 314' is executed, step 38 may be directly executed, or step 38 may be executed after a response message of channel assignment returned by the AT is received;

after completing step 38, go to step 315';

step 315': after the AT is switched to the target AN, a channel assignment completion message is sent to the target AN in AN access channel.

In the processing steps shown in fig. 2 and fig. 3, it is not limited that each execution step is executed strictly according to the above sequence, and for some operation steps, the time for starting to execute the corresponding step may be flexibly determined according to actual needs. For example, step 222 in fig. 2 and step 319 in fig. 3 may be performed only after the channel and UATI assignment process for the terminal AT is completed, and is not limited to be performed after the connection between a9 and AL is established. As another example, the channel and UATI assignment processing procedure in fig. 2 and 3 may be performed at any time after the destination AN and the PDSN are confirmed to establish a connection, and is not limited to the processing sequence shown in fig. 2 and 3.

In summary, the present invention realizes a hard handoff process between ANs among PCFs. And provides AN inter-AN switching mechanism with less packet loss and higher reliability in AN HRPD network.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for realizing switching between activated AN in HRPD network is characterized in that the method comprises the following steps:

2. The method of claim 1, wherein the step a comprises:

a2, source AN sends switching request message to destination AN.

3. The method of claim 1, wherein when performing handoff between ANs belonging to different PCFs, said step B comprises:

or,

4. The method of claim 3, wherein said step B1 further comprises:

and when the PDSN determines that the connection between the destination PCF and the PDSN is switched between the ANs according to the existence condition of the connection between the destination PCF and the PDSN, the double-broadcasting indication message is sent.

5. The method of claim 3, wherein the step B further comprises:

6. The method of claim 5, wherein said step B3 comprises:

or,

7. The method for implementing AN active state inter-AN handover in HRPD network according to any of claims 3, 4, 5 or 6, wherein the step B further comprises:

8. The method of claim 7, wherein the step B further comprises:

9. The method for implementing AN active state inter-AN handover in HRPD network according to claim 1, 2, 3, 4, 5 or 6, wherein the step B comprises:

10. The method of claim 9, wherein step B further comprises:

11. The method of claim 9, wherein the method further comprises:

12. The method for implementing AN active state inter-AN handoff in AN HRPD network according to claim 1, 2, 3, 4, 5 or 6, wherein the data comprises:

real-time traffic data and non-real-time traffic data.

13. The method of claim 12, wherein the method further comprises: