WO2010118679A1

WO2010118679A1 - Method for switching between local switch link and non-local switch link

Info

Publication number: WO2010118679A1
Application number: PCT/CN2010/071741
Authority: WO
Inventors: 罗小冬; 彭江萍; 刘旭杰
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-04-13
Filing date: 2010-04-13
Publication date: 2010-10-21
Also published as: CN101860991A; CN101860991B

Abstract

A method for switching between a local switch (LS) link and a non-local switch (Non-LS) link is provided. The method comprises: in the process of state switching between the LS link and the Non-LS link, a base transceiver station transceives both Non-LS link data packets and LS link data packets, but only processes valid data packets received. By using the technical solution, seamless connection of voice is achieved in switching between the LS link and the Non-LS link, decline of voice quality is avoided, and user experience is improved.

Description

Method for switching between local exchange link and non-local exchange link

Technical field

The present invention relates to the field of mobile communications, and in particular, to a method for switching between a Local Switch (LS) link and a non-local switching link.

Background technique

In the current Global System for Mobile Communications (GSM) system, the mobile station (MS) is connected to the base station (Base Transceiver Station, BTS) through the air interface, and the base station passes the ABIS interface and the base station controller (Base Station). Controller, BSC) The BSC interacts with the Mobile Switch Center (MSC) through the A port. The Transcoder/Rate Adaptor Unit (TRAU) is usually located on the BSC side to perform the conversion process of the speech algorithm codec. In the uplink direction, the Transcoder (TC) converts the compressed data packet of the BTS into a Pulse Code Modulation (PCM) voice to the MSC side, and the downlink direction sends the compressed data packet to the MSC. The PCM packet is passed to the BTS by encoding into a speech parameter, which is then transmitted to the MS.

When two users of a call are in one BSC and the voice algorithm is compatible, the local exchange of the user's voice channel can be performed, that is, the user voice channel is switched from one BTS to another BTS, thereby saving TC resources and A. Port resources, and voice quality will be improved accordingly. In the case of the IPAbis interface, local switching can also save Abis interface resources. The establishment of a local exchange may be performed in the case of supplementary service completion, internal handover, and external handover (that is, the user session is switched from a non-LS state to an LS state). The local exchange may be removed during the supplementary service start, internal handover, and external cut-out (that is, the user session is switched from the LS state to the non-LS state).

The general processing flow of the user session from the non-LS state to the LS state is: The BSC sends a local exchange establishment command to the BTS; after receiving the command, the BTS will establish a local exchange link, and then release the current non-local exchange link. And inform the BSC that the handover is complete. As shown in Figure 1.

The general processing flow for switching the user session from LS state to non-LS state is: BSC to BTS A command for non-local exchange establishment is sent; after receiving the command, the BTS will establish a non-local exchange link, then remove the current local exchange link and inform the BSC that the handover is complete. as shown in picture 2.

In the above processing method, the BTS only receives and transmits voice packets (ie, a single-receipt and single-issue) for a certain link (the LS link or the non-LS link) at the same time.

Due to network delay and other reasons, when using the single-receipt single-issue mode, during non-LS to LS state switching, the user plane data packet of the local switching link cannot reach the BTS immediately following the control plane; and the LS to non-LS During the state switching process, after the local switching link is removed, it is unlikely that the data packet of the non-local switching link will be received immediately. Therefore, the voice will be interrupted instantaneously, resulting in a drop in voice quality. In order to avoid this problem, it is required. Use related techniques to avoid degradation of voice quality.

Summary of the invention

The present invention provides a method for switching between a local switched link and a non-local switched link, which can avoid the degradation of voice quality when the LS link and the non-LS link are switched.

In order to solve the above problem, the present invention provides a method for mutually switching a local switching link and a non-local switching link, including: in a local exchange LS link and a non-LS link state switching process, the base station is not a non-LS chain. The data packets are sent and received, and the LS link data packets are also sent and received, but only the received valid data packets are processed.

The above method may also have the following feature: the base station buffers the data packet received from the LS link for a period of time, and the processing time is performed by the base station receiving the data packet from the non-LS link and receiving from the LS link. The time difference of the data packet is the time when the base station transmits the data packet to the opposite base station on the non-LS link.

The foregoing method may further include: the base station distinguishes the LS link data packet and the non-LS link data packet by: when the data packet is a time division multiplexed TDM format, the data packet is distinguished by a format; when the data packet is an IP format When distinguishing by receiving the port or IP address of the packet.

The method may also have the following features: When the terminal switches from the non-LS link to the LS link, the base station that receives the LS link setup command sends a data packet to the opposite base station, and starts to receive the data packet sent by the base station. And the base station continues to send and receive data packets on the non-LS link, but the base station only processes the non-LS link data packets, and then processes and sends the data packets to the corresponding terminal. The method may further include: when the base station receives the data packet sent by the base station, and returns a response message to the base station controller, informing the base station controller that the LS link data packet has been received, and converting to processing the LS chain Road data packet, stop processing non-LS link data packets sent by the TC;

The method may further include: after receiving the response message returned by the base station, the base station controller notifies the two base stations to remove the non-LS link, and the base station removes the non-LS link after receiving the notification.

The method may further include: when the base station receives the data packet sent by the base station, and returns a response message to the base station controller, informing the base station controller that the LS link data packet has been received, and continuing to process the non-LS chain Road data packet

After receiving the response message returned by the base station, the base station controller notifies the two base stations to remove the non-LS link;

After receiving the notification of dismantling the non-LS link, the base station turns to process the LS link data packet, and removes the non-LS link.

The method may also have the following features: When the terminal switches from the LS link to the non-LS link, the base station that receives the non-LS link setup command sends a data packet to the base station controller, and starts to receive the call from the base station controller. The data packet, and the base station continues to send and receive data packets on the LS link, but the base station only processes the LS link data packet, and the processing is sent to the corresponding terminal.

The method may further include: after receiving, by the base station, a data packet sent by the base station controller, returning a response message to the base station controller, informing the base station controller that the non-LS link data packet has been received, but the base station Still processing LS link packets;

After the base station controller receives the second response message, it notifies the base station to remove the base station after a preset time.

On the LS link, the base station that receives the notification starts to process the non-LS link data packet, stops processing the LS link data packet, and tears down the LS link.

The method may further have the following feature: in the step of the base station receiving the notification starting to process the non-LS link data packet and stopping processing the LS link data packet, the base station receiving the dismantled LS link Immediately after the notification, the data packet received from the non-LS link is processed, or the data packet received from the non-LS link is processed after processing the data packet received and buffered from the LS link.

The invention also provides a base for supporting mutual switching between a local exchange link and a non-local exchange link. The base station is configured to: in the process of locally switching the LS link and the non-LS link state, transmitting and receiving the non-LS link data packet, and also transmitting and receiving the LS link data packet, but only for receiving A valid packet is processed.

The base station may also have the following feature: the base station is configured to buffer the data packet received from the LS link for a period of time, and then perform processing, where the base station receives the data packet from the non-LS link and the slave LS chain. The time difference of receiving data packets on the road or the time when the base station sends a data packet to the opposite base station on the non-LS link.

The base station may be further configured to distinguish between the LS link data packet and the non-LS link data packet by: when the data packet is a time division multiplexed TDM format, the data packet is distinguished by a format; when the data packet is an IP format When distinguishing by receiving the port or IP address of the packet. The base station is configured to transmit and receive non-LS link data packets, and also send and receive LS link data packets, but only for receiving, when the terminal switches from the non-LS link to the LS link. The effective data packet is processed: the base station receives the LS link setup command, sends a data packet to the opposite base station on the LS link, and starts receiving the LS link data packet sent by the base station, and the base station continues to be in the non- The LS link transmits and receives data packets, but only processes non-LS link data packets, and processes the packets to the corresponding terminals of the base station.

The base station is configured to send and receive non-LS link data packets, and also to send and receive LS link data packets, but only for receiving, in a process in which the terminal switches from the LS link to the non-LS link. The effective data packet is processed: the base station receives the non-LS link setup command, sends a data packet to the base station controller on the non-LS link, and starts to receive the non-LS link data packet sent by the base station controller, and The base station continues to send and receive data packets on the LS link, but only processes the LS link data packets, and processes the data packets to the terminal corresponding to the base station.

In summary, the present invention provides a method for switching between a local switching link and a non-local switching link, which implements seamless connection of voice between LS link and non-LS link switching, and avoids degradation of voice quality. Improve the user experience.

BRIEF abstract

Figure 1 is a flow chart of non-LS to LS switching in a single-receipt mode; 2 is a flow chart of LS to non-LS switching in a single-receipt mode;

Figure 3 is a flow chart of non-LS to LS switching in dual-received dual-issue mode;

Figure 4 is a flow chart of LS to non-LS switching in dual-received dual-issue mode.

Preferred embodiment of the invention

The present invention provides a method for mutually switching between a local switched link and a non-local switched link. In the process of LS link and non-LS link state switching, the base station not only transmits and receives non-LS link data packets but also LS chain. The data packet is sent and received, but only the received valid data packet is processed.

This embodiment provides a method for switching between a local switching link and a non-local switching link. When the BTS receives the LS link setup command or the non-LS link setup command, the BTS uses the dual-received dual-issue mode, that is, the state switch. In the process, the BTS not only transmits and receives non-LS link data packets (downlink data packets of port A, that is, data packets sent by the TC, referred to as downlink data packets), but also uplinks sent by the LS link data packets (the other party BTS). The data packet, referred to as the uplink data packet, is sent and received. Although the BTS can receive packets of LS links and non-LS links, the BTS only selects valid packets for processing.

In addition, due to the network delay problem, the LS voice packet and the non-LS voice packet always differ in the time of DELAY packets during the handover between LS and non-LS. This delay will cause voice interruption (when not LS to LS switching) or voice repetition (when LS to non-LS switching). This requires the BTS to buffer the data packets on the received LS link before processing. That is, on the LS link, each packet received is cached and then processed, and the DELAY time corresponds to DELAY. The size of the data packet is the time difference between the BTS receiving the data packet from the non-LS link and the data packet received from the LS link. Generally, the delay of the BTS receiving the data packet from the LS link is negligible. Therefore, DELAY The time of the data packet can be regarded as the time when the BTS transmits the data packet to the opposite BTS on the non-LS link, that is, the time of the BTS1 TC1 MSC TC2 BTS2. Therefore, during the handover from non-LS to LS, or from LS to non-LS, the BTS should buffer each packet received on the LS link and then process it (the first DELAY data to be received). The packet is cached first, and the first packet is processed from the receipt of the first DELAY+1 packet.

The following switches from the non-LS state to the LS state, and the LS state to the non-LS state switch. The invention is described in detail. The method of determining whether to establish and tear down the local exchange and when to initiate the establishment and removal of the local exchange are not part of the present invention. Since the IP and TDM formats are similar, the following describes the specific implementation process mainly through the IP environment.

(1) Switch from non-LS state to LS state, as shown in Figure 3. When the BSC needs to switch from the non-LS state to the LS state (for example, if the bandwidth load is too heavy, or the supplementary service or resource permission is completed), the BSC may request the MSC to perform the current non-LS state according to the process of FIG. Change to LS state. The specific process is described as follows:

Step 301: When the BSC finds that a non-LS link to the LS link switch needs to be performed, the BSC sends an LS handover request to the MSC.

Step 302: After receiving the LS request from the BSC, the MSC returns an LS link establishment command to the BSC.

Step 303: After receiving the LS command of the MSC, the BSC performs algorithm negotiation with the BTSs of the two parties. If the BTS and the BSC are compatible with each other, the BSC sends an LS link setup command to the BTSs, and sends the relevant parameters to the BTS. Related parameters include the IP address and MAC address of the other party's BTS.

Step 304: After receiving the LS link setup command sent by the BSC, the BTS first sends a data packet to the other party BTS according to the received IP address, and starts to receive the data packet sent by the BTS of the other party; The packet, that is, the data packet transmitted and received by the other party BTS continues to be sent and received on the non-LS link; after the BTS receives the data packet sent by the other party BTS, the BTS returns a response message to the BSC, informing the BSC that the LS link has been received. Packet. The two packets received by the BTS are valid. Therefore, the BTS can select one of the two packets for processing, that is, it can be converted to processing LS link packets, or it can process non-LS link packets. You need to pay attention to the synchronization process when processing, see the description below.

The specific procedures for the BTS (BTS1 and BTS2) of the calling party to implement dual-receiver dual-issue are as follows: 1) BTS1 and BTS2 send and receive data packets through the TC and the non-LS link of the core network, and the data link is represented as BTS1 —> BSC ( TC) —> MSC —> BSC(TC) —> BTS2.

2) After receiving the LS link setup command, BTS1 and BTS2 remain unchanged in the non-LS link described in 1), and the calling BTS still maintains the call through this link. 3) BTS1 copies the data packet sent to the TC, and then encapsulates it into a MAC data packet, and the MAC data includes the IP address and MAC address of the active BTS1, the IP address and MAC address of the destination BTS2, and the port number information.

The BTS2 copies the data packet sent to the TC and then encapsulates it into a MAC data packet, which includes the IP address and MAC address of the active BTS2, the IP address and MAC address of the destination BTS1, and the port number information.

4) BTS1 judges the received data packet (the MAC data packet is generally judged by the port number), and if it is the data packet sent by the TC, it is processed and sent to MS1; if it is judged that the data packet is When BTS2 sends it, BTS1 sends a response message to the BSC.

The BTS2 judges the received data packet. If it is a data packet sent by the TC, it processes and sends it to the MS2. If it is determined that the data packet is sent by the BTS1, the BTS2 sends a response message to the BSC.

5) After both BTS1 and BTS2 receive the data packet sent by the other party, the LS link between BTS1 and BTS2 is established. The LS link is expressed as: BTS1 BTS2. BTS1 and BTS2 send and receive data packets on the LS link.

At this time, both BTS 1 and BTS2 implement double-receiving and dual-issue of data packets.

Step 305: After both the calling BTSs send the response message to the BSC, the BSC has established the LS data link between the BTSs at the same time. The BSC then sends a non-LS link teardown command to both BTSs. If the BTS continues to process the non-LS link data packet in step 304, the BTS receives the above-mentioned teardown command and then switches to processing the LS link data packet, and removes the non-LS link, and the BSC also releases the corresponding TC resource.

In step 304 or 305, when the BTS is switched to process the LS link data packet, in order to synchronize the data packet, the BTS first buffers the data packet of the received LS link by DELAY packets and then processes it. The specific flow of the BTS cache DELAY packets can be, but is not limited to,:

1) The BTS allocates a memory area (static or dynamic allocation) in memory based on the pre-computed DELAY size. This area is divided into DELAY, and the index numbers are 0, 1, 2, ... (DELAY-1).

2) When the BTS receives the first packet of the LS link, it stores the packet in the memory area with index number 0. 3) When the BTS receives the 2nd, 3rd, 4th, ... DELAY data packets, the data packets are sequentially stored in the memory whose index numbers are 1, 2, 3, ... (DELAY-1).

4) When the BTS receives the (DELAY+1) packet, the packet with the index number 0 is taken out for processing or discarded, and then the packet of (DELAY+1) is stored at the index number 0.

5) When the BTS receives the (DELAY+2) packet, it processes the packet with index number 1 and stores the currently received packet to the index number 1. The loop is repeated by analogy to realize the buffering of the DELAY packets, so that the voice packets of the LS link and the non-LS link are synchronized.

Step 306: The BSC sends an LS response message to the MSC, informing the MSC that the TC resource has been removed. After receiving the above response message, the MSC removes the user plane and the A port related resources. At this time, the MSC no longer sends any data packets to the A port, and the A port data no longer intersects. The state switch is completed.

If the BTS continues to process the non-LS link data packet in step 304, the BSC must first send a non-LS link teardown command to the BTS (corresponding to step 305), and then send an LS response message to the MSC (corresponding to step 306); In step 304, the BTS is switched to process the LS link data packet, and the BSC may first send a non-LS link teardown command to the BTS (corresponding to step 305), and then send an LS response message to the MSC (corresponding to step 306), or The LS response message is sent to the MSC (corresponding to step 306), and then the non-LS link teardown command is sent to the BTS (corresponding to step 305).

In this embodiment, the BTS is switched from processing downlink data to processing uplink data, and there is no interruption of voice in the middle.

(2) Switching from LS to non-LS state, as shown in Figure 4. If you need to switch from LS to non-LS state (for example, when the MSC has related supplementary service processing), you can remove the current LS according to the process in Figure 4 and restore the original non-LS processing status. The schematic diagram of the process is as follows: In this embodiment, the BTS buffers the data packets received from the LS link for a period of time (that is, the time of DELAY packets) before and after the handover. The specific process of the BTS cache is described in step 305.

Step 401: The MSC sends an LS removal command to the BSC, and carries the removed LC (Local Call, LC for short) identifier. When the MSC sends the teardown LS command, the MSC has established the related A port resources and has cross-connected the A port data of both users.

Step 402: After receiving the LS removal command, the BSC needs the BSC to query the related resources of the TC. Once established, the BSC then sends a command to the two BTSs to establish a non-LS link.

Step 403: After receiving the BSC command, the BTS sends a data packet of the corresponding format to the BSC (TC). Receive packets from the BSC (TC) at the same time. At this time, the BTS adopts the dual-receiving dual-issue mode, that is, the BTS transmits and receives data packets on the non-LS link, and also transmits and receives data packets on the LS link.

After receiving the data packet sent by the BSC (TC), the BTS returns a response message to the BSC, informing the BSC that the data packet of the non-LS link has been received, but the BTS is sent to the BSC (TC) due to the network delay. The data packet cannot reach the BTS of the other party immediately, so the TC data packet received by the BTS of the calling party is an invalid data packet, so the BTS still processes the uplink data packet of the LS link.

Here, the specific procedures for the BTS (BTS1 and BTS2) of the calling parties to achieve dual-receipt and dual-issue are as follows:

1) BTS1 and BTS2 send and receive data packets through the LS link, and the data link is represented as BTS1^BTS2.

2) After receiving the non-LS link setup command, BTS1 and BTS2 remain unchanged in the LS link described in 1). Both parties to the call still hold the call through this link.

3) BTS1 copies the packet sent to BTS2 and then encapsulates it into a MAC packet.

The MAC packet contains the IP and MAC address of the source address BTS1, the IP and MAC address of the destination address BSC, and the port number information. Finally, the MAC packet is sent.

BTS2 copies the packets sent to BTS1 and then encapsulates them into MAC packets. The MAC packet contains the IP and MAC address of the source address BTS2, the IP and MAC address of the destination address BSC, and the port number information. Finally, the MAC packet is sent.

4) BTS1 judges the received data packet (the MAC data packet here is generally judged by the port number), and if it is the data packet sent by BTS2, it is processed and sent to MS1; if it is judged that the data packet is When the BSC sends it, the BTS1 sends a response message to the BSC.

The BTS2 judges the received data packet. If it is a data packet sent by the BTS1, it processes and sends it to the MS2. If it is determined that the data packet is sent by the BSC, the BTS2 sends a response message to the BSC.

5) After both BTS1 and BTS2 receive the data packet sent by the BSC, BTS1 and BTS2 send and receive data packets on the non-LS link, but the data packet of the non-LS link is invalid at this time. non-LS link Expressed as BTS1 <-^> BSC(TC) <-^> MSC <-^> BSC(TC) <-^> BTS2.

Step 404: After the BSC receives the response message from the calling BTS (that is, after receiving the response message of the second BTS), the non-LS control link is established (but the non-LS data link may not be established yet, That is, the data packet sent by the BTS to the BSC (TC) does not necessarily have reached the counterpart BTS). After the preset time, the BSC sends a command to remove the LS link to the BTSs of both parties. The BTS ends the dual-received dual-issue, that is, it no longer sends and receives data packets to the other BTS, only sends and receives data packets to the BSC (TC), and the BTS switches to processing the downlink data packets of the non-LS link to enter the non-LS state. In this case, the BTS may process the valid data packet received from the non-LS link immediately, or may set the preset time after the slave LS link is processed to ensure that the two BTSs have received valid TC data packets. The size of the packet is not less than the time when the packet arrives at the BTS of the other party from the BSC (TC) (slightly greater than this time. If the packet is too large, the switching time is too long), a timer can be set, and when the time is up, the BSC is to both parties. The BTS sends a command to tear down the LS link (the time starting point is that the BSC receives the response message sent by the second BTS).

Step 405: The BSC sends a non-LS response message to the MSC, and the normal non-LS link is established. In the above link switching process, the BTS can distinguish the non-LS link data packets (that is, the downlink data packets sent by the BSC (TC)) and the LS link data packets (that is, the uplink data packets sent by the peer BTS). ) :

( a ) When the data packet is in the TDM (Time Division Multiplex) format of the E1 environment, the format of the uplink and downlink data packets is different, so the BTS can distinguish by the format of the data packet;

(b) When the data packet is in the IP format of the IP environment, the format of the uplink and downlink data packets is the same. In this case, the BTS can distinguish by the port or IP address of the received data packet, and the uplink data packet is different from the downlink data packet. The port reaches the BTS.

At the instant of LS and non-LS state switching, each BTS has two-way data packets for transmission and reception, that is, one BTS transmits and receives downlink data packets from the A port, and also transmits and receives uplink data packets from the other party BTS, thereby realizing the switching moment. The seamless connection of voice avoids the degradation of voice quality.

The invention is applicable not only to different terminals belonging to the same BSC and different BTSs; In the same BSC, different terminals under the same BTS, that is, the two BTSs in the above embodiment are the same BTS, or two different BTSs.

The present invention also provides a base station that supports mutual switching between a local switching link and a non-local switching link. The base station performs non-LS link data packets in the process of locally switching LS link and non-LS link state switching. Transceiver, also sends and receives LS link packets, but only processes the received valid packets.

The foregoing base station buffers the data packet received from the LS link for a period of time, and the processing time is the time difference between the time when the base station receives the data packet from the non-LS link and the data packet received from the LS link, or is the base station. The time at which a packet is sent on the non-LS link to the other base station.

The foregoing base station may also distinguish between the LS link data packet and the non-LS link data packet by: when the data packet is a time division multiplexed TDM format, the data packet is distinguished by a format; when the data packet is in an IP format, The port or IP address of the received packet is used for distinguishing.

In the process of the terminal switching from the non-LS link to the LS link, the base station receives the LS link setup command, sends a data packet to the opposite base station on the LS link, and starts receiving the LS link data sent by the base station. The packet, and the base station continues to send and receive data packets on the non-LS link, but processes only the non-LS link data packets, and processes the packets to the corresponding terminals of the base station.

In the process of the non-LS link that the terminal switches from the LS link, the base station receives the non-LS link setup command, sends a data packet to the base station controller on the non-LS link, and starts receiving the packet sent by the base station controller. The non-LS link data packet, and the base station continues to send and receive data packets on the LS link, but only processes the LS link data packet, and processes the data packet to the terminal corresponding to the base station.

Industrial applicability

Compared with the prior art, the method for switching the LS link and the non-LS link of the present invention realizes the seamless connection of the voice when the LS link and the non-LS link are switched, thereby avoiding the degradation of the voice quality and improving the voice quality. user experience.

Claims

Claim

A method for switching between a local switching link and a non-local switching link, including: in a process of locally switching LS link and non-LS link state switching, the base station not only transmits and receives non-LS link data packets, but also The LS link data packet is sent and received, but only the received valid data packet is processed.

2. The method according to claim 1, wherein: the base station buffers a data packet received from the LS link for a period of time, and the processing time is that the base station receives the data packet from the non-LS link. The time difference from receiving a packet from the LS link or the time at which the base station transmits a packet on the non-LS link to the other base station.

3. The method of claim 2, further comprising:

The base station distinguishes between the LS link data packet and the non-LS link data packet by: when the data packet is a time division multiplexed TDM format, the data packet is distinguished by a format; when the data packet is in an IP format, by receiving The port or IP address of the packet is distinguished.

4. The method according to claim 1 or 2 or 3, wherein

The state switching process is a process in which a terminal switches from a non-LS link to an LS link;

The base station not only transmits and receives non-LS link data packets but also sends and receives LS link data packets, but only processes the received valid data packets: the base station receives an LS link setup command, and the LS link Sending a data packet to the base station and starting to receive the LS link data packet sent by the base station, and the base station continues to send and receive data packets on the non-LS link, but only processes the non-LS link data packet, and then sends the data packet after processing. A terminal corresponding to the base station.

5. The method of claim 4, further comprising:

After receiving the LS link data packet sent by the base station, the base station returns a response message to the base station controller, informing the base station controller that the LS link data packet has been received, and the base station is converted to the processing LS link. The data packet stops processing the non-LS link packets sent by the pattern converter TC.

The method according to claim 5, further comprising: after receiving the response message returned by the base stations, the base station controller sends a notification of removing the non-LS link to the two base stations, where the two base stations receive the The non-LS link is removed after the notification.

7. The method of claim 4, further comprising: After receiving the LS link data packet sent by the base station, the base station returns a response message to the base station controller, informing the base station controller that the LS link data packet has been received, and the base station continues to process the non-LS link data. package;

After receiving the response message returned by the base station, the base station controller sends a disconnection non-LS link notification to the two base stations;

After receiving the notification of removing the non-LS link, the two base stations switch to processing the LS link data packet, and remove the non-LS link.

8. The method according to claim 1 or 2 or 3, wherein

The state switching process is a process in which the terminal switches from the LS link to the non-LS link;

The base station not only transmits and receives non-LS link data packets but also sends and receives LS link data packets, but only processes the received valid data packets: the base station receives non-LS link establishment commands, and is not LS. Sending a data packet to the base station controller on the link, and starting to receive the non-LS link data packet sent by the base station controller, and the base station continues to send and receive data packets on the LS link, but only processes the LS link data packet. After processing, it is sent to the terminal corresponding to the base station.

9. The method of claim 8 further comprising:

After receiving the non-LS link data packet sent by the base station controller, the base station returns a response message to the base station controller, informing the base station controller that the non-LS link data packet has been received, but the base station still processes the LS. Link data packet

After receiving the second response message, the base station controller sends a notification of dismantling the LS link to the two base stations after a preset time, and the two base stations that receive the notification start to process the non-LS link data packet, and stop processing the LS link data packet. And remove the LS link.

10. The method according to claim 9, wherein, in the step of receiving the notification, the base stations of both parties start processing the non-LS link data packet, and stopping processing the LS link data packet,

The two base stations process the data packets received from the non-LS link immediately after receiving the notification of tearing down the LS link, or after processing the data packets received and buffered from the LS link. Packets received on non-LS links.

11. A base station supporting a local switching link and a non-local switching link, wherein the base station is configured to: in a local exchange LS link and a non-LS link state switching process, not to a non-LS chain The data packet is sent and received, and the LS link data packet is also sent and received, but only the received valid data packet is processed.

12. The base station according to claim 11, wherein the base station is configured to buffer a data packet received from the LS link for a period of time, and then perform processing, where the buffer time is that the base station receives the data packet from the non-LS link. The time difference of receiving a data packet from the LS link or the time when the base station transmits a data packet to the opposite base station on the non-LS link.

13. The base station according to claim 12, wherein the base station is further configured to distinguish between an LS link data packet and a non-LS link data packet by: when the data packet is a time division multiplexed TDM format, The format is distinguished; when the data packet is in the IP format, the distinction is made by receiving the port or IP address of the data packet.

14. The base station according to claim 11 or 12 or 13, wherein

The base station is configured to transmit and receive non-LS link data packets, and also send and receive LS link data packets, but only for receiving, when the terminal switches from the non-LS link to the LS link. The effective data packet is processed: the base station receives the LS link setup command, sends a data packet to the opposite base station on the LS link, and starts receiving the LS link data packet sent by the base station, and the base station continues to be in the non- The LS link transmits and receives data packets, but only processes non-LS link data packets, and processes the packets to the corresponding terminals of the base station.

The base station according to claim 11 or 12 or 13, wherein