CN101179844B - Processing of packet switching cancellation, packet switching method - Google Patents

Abstract

The present invention discloses a packet handoff cancellation process, packet flow context deletion, a packet handoff method, and a service GPRS support node. The packet handoff cancellation process includes the following steps: a base station receives a handoff cancellation message for a mobile station; if the mobile station is no longer in the handoff phase, the base station does not execute the handoff cancellation process for the mobile station. This invention prevents the base station from mistakenly deleting a newly connected link upon receiving the handoff cancellation message, thus avoiding handoff anomalies.

Description

Processing of packet switching cancellation, packet switching method

technical field

The present invention relates to a communication method and equipment, in particular to a processing of packet switching cancellation and a packet switching method.

Background technique

In the Packet Switched Domain (PS, Packet Switched Domain) of the Global System for Mobile Communication (GSM, Global System for Mobile Communication), the jitter rate and loss of real-time packet services such as sessions and streams are reduced by introducing packet switching. Packet rate to ensure the quality of service (QoS, Quality of Service).

According to different considerations, packet switching can be divided into different types.

1. According to the mode of the mobile station (MS, Mobile Station), packet switching can be divided into packet switching from A/Gb mode to A/Gb mode, packet switching from A/Gb mode to Iu mode, and packet switching from Iu mode to Iu mode switch;

2. According to the network elements involved, the packet handover can be divided into: 1) Source Base Station Subsystem (BSS, BaseStation System) Intra BSS (Intra BSS), 2) General Packet Radio Service (GPRS, General Package Radio Service) Support Node (SGSN) , Service GPRS Supporting Node) intra-SGSN handover (Intra SGSN) and 3) inter-SGSN handover (Inter SGSN);

3. According to whether it is synchronous or not, packet switching can be divided into: 1) synchronous packet switching and 2) asynchronous packet switching. Synchronous packet handover means that the source cell where the MS resides before the packet handover is synchronized with the target cell where the MS resides after the packet handover. Since the MS knows the Timing Advance (TA, Timing Advance), the MS sends an access burst (Access Burst) in the target cell. Burst) is optional, and the MS can directly send a normal burst (Normal Burst). Asynchronous packet handover means that the source cell where the MS resides before the packet handover is not synchronized with the target cell where the MS resides after the packet handover. The MS must first obtain the TA by sending an access burst before sending a normal burst in the target cell.

Figure 1 is a flow chart of the existing packet handover, in which the packet handover includes two stages of preparation and execution, and the specific implementation process includes the following steps:

Preparatory phase for packet handover

Step 101: The source BSS determines to initiate packet handover (Decision to Perform A/Gb PSHandover).

There are many reasons for packet handover. For example, the source BSS can trigger packet handover according to the measurement report from the MS; the source BSS can also trigger packet handover according to the message that the MS actively reports the request for cell reselection, and the message that requires cell reselection It can be a packet cell update notification (Packet CellChange Notification); or the source BSS has limited serving cell resources, and the BSS can initiate a packet handover; The access network (UTRAN, UMTSTerritorial Radio Access Network) cell update order (CCO, Cell Change Order) initiates packet handover, so that the MS can obtain better services in the new cell.

Step 102: The source BSS sends a packet handover request (PS Handover Required) to the SGSN.

The packet handover request carries a handover cause value, a source cell ID, a target cell ID, and a container from the source BSS to the target BSS. If the source BSS triggers packet handover according to the measurement report from the MS, or the source BSS initiates packet handover due to limited serving cell resources, the target cell can be selected by the source BSS according to the measurement result or load; The message requiring cell reselection triggers packet handover, or the source BSS initiates packet handover according to the UTRAN CCO from the SGSN, then the target cell can be selected by the MS or other BSS and notify the source BSS.

Step 103: After receiving the packet handover request, the SGSN determines whether the current packet handover type is intra-BSS handover, intra-SGSN handover, or inter-SGSN handover according to the source cell ID and the target cell ID, and performs subsequent operations according to the determined packet handover type.

The SGSN can determine the handover type according to the locations of the source cell and the target cell. If the source cell and the target cell are governed by the same BSS, the current packet handover type is intra-BSS handover; if the source cell and the target cell are governed by the same SGSN, then The current packet handover type is intra-SGSN handover. If the source cell and the target cell are governed by different SGSNs, the current packet handover type is inter-SGSN handover.

If the current packet handover type is handover in the BSS or in the SGSN, then the SGSN determines the target BSS according to the target cell identity and determines whether the routing area (RA, Routing Area) changes, and if the RA changes, the SGSN distributes the grouping temporary mobile subscriber identity ( P-TMSI, Packet Temporary Mobile Subscriber Identity), and obtain the Temporary Logical Link Identifier (TLLI, Temporary Logical Link Identifier) according to the P-TMSI, and then send a packet handover request (PSHandover Request) to the target BSS, in the packet handover request Carry P-TMSI, TTLI and PFCs to BeSetup List, and forward the source BSS sent from the source BSS to the container of the target BSS, where the PFCs to BeSetup List is established by the SGSN according to the maximum bitrate parameter in QoS; if RA does not Change, the SGSN sends a packet handover request directly to the target BSS.

If the current packet handover type is inter-SGSN handover, the source SGSN determines the target SGSN according to the target cell ID, and then interacts with the target SGSN to provide the target SGSN with information about the target cell ID and MS, and the target SGSN determines the target BSS according to the target cell ID, And send a packet handover request to the target BSS. The source SGSN is the SGSN that controls the source BSS where the MS resides before the packet handover, and the target SGSN is the SGSN that controls the target BSS where the MS resides after the packet handover.

Step 104: After receiving the packet handover request, the target BSS allocates and reserves wireless resources for the MS according to allocation strategies such as PFCs to Be Setup List and currently available wireless resources, and creates an information container (Container) from the target BSS to the source BSS ).

The content of the information container is the radio resource allocation information from the target BSS to the source BSS, that is, the information describing the radio resources allocated to the MS, such as Temporary Flow Identity (TFI, Temporary FlowIdentity). The radio resource allocated and reserved by the target BSS for the MS includes at least an uplink Temporary Block Flow (TBF, Temporary Block Flow), and the uplink TBF can be identified by an uplink state flag (USF, Uplink State Flag).

Step 105: If the current packet handover type is intra-BSS handover or intra-SGSN handover, the target BSS sends a packet handover response (PS Handover Request Acknowledge) to the SGSN, and the packet handover response carries information container information; if the packet handover type is SGSN Inter-handover, the target BSS sends a packet switching response to the target SGSN, and the packet switching response carries information container information.

Execution Phase of Packet Handover

Step 106: If the current packet handover type is handover between SGSNs, after receiving the packet handover response, the target SGSN sends handover information to the source SGSN, such as Network Service Access Point Identifier (NSAPI, Network Service Access Point Identifier), GPRS Tunneling Protocol User plane identifier (GTP-U Number, User plane of GPRS Tunneling Protocol Number); if the current packet handover type is intra-BSS handover or intra-SGSN handover, this step is omitted.

Step 107: The SGSN sends a packet handover response (PS Handover RequiredAcknowledge) to the source BSS to notify the source BSS to prepare for handover, and the packet handover response carries the content of the information container. If the current packet handover type is inter-SGSN handover, the SGSN mentioned in this step is the source SGSN.

Step 108: After the source BSS receives the packet switching response, it stops the uplink service of the MS according to the QoS requirements, and then the source BSS interrupts the logical link control (LLC, Logic LinkControl) protocol data unit (PDU, Protocol Data Unit) of the downlink TBF of the MS , and send a packet handover command (PS Handover Command) to the MS to notify the MS to perform packet handover, and the handover command carries the target BSS identifier.

Step 109: After the MS receives the packet switching command, it suspends the uplink user data, buffers or discards the uplink user data according to the QoS requirements of the current service, and then the MS starts to execute the switching command, and transfers to the time slot and wireless channel of the target cell according to the target BSS identifier and send a packet handover access message (PS Handover Access) carrying a handover reference to the target BSS according to the packet handover command. The handover reference is used by the target cell to identify the MS, and determines whether the MS accesses according to the handover reference. After allocating radio resources for the MS, the target cell waits for the MS to access.

Step 110: After receiving the packet handover access message, the target BSS returns a packet physical information message (Packet Physical Information) to the MS. The packet physical information message carries a TA to notify the MS of the correct TA. If the current packet switching type is synchronous packet switching, this step can be omitted. In this way, this step must be performed when the current packet switching type is asynchronous packet switching, and is optional when the current packet switching type is synchronous packet switching.

Step 111: The MS sends a normal burst format (Normal Burst Format) radio link control (RLC, Radio Link Control)/media access control (MAC, Media Access Control) data block to the target BSS.

The MS starts to use the common burst format to resume the transmission of uplink LLC PDUs on the wireless channel allocated by the target BSS, such as location update requests. After the target BSS receives the first correct RLC/MAC data block in common burst format from the MS, it sends a PS Handover Complete message (PS Handover Complete) to the SGSN through the Gb interface to notify the SGSN that the packet handover has been completed.

If it is a synchronous handover, the MS can directly send RLC/MAC data blocks in a common burst format to the target BSS instead of accessing the target BSS by sending a packet handover access message. In this way, the target BSS omits sending the corresponding packet physical information to the MS message, therefore, step 109 and step 110 can be omitted.

The content of the above-mentioned information container can carry a packet switching command, and the content of the message can include: paging mode (PAGE_MODE), TBF identifier (Global TFI), container identifier (CONTAINER_ID) and the payload of packet switching based on A/Gb mode (PS Handover to A/Gb Mode Payload) or Iu mode-based packet switching payload (PS Handover to UTRAN/GERAN IuMode Payload). Among them, the payload is composed of two parts: wireless access and core network. The wireless access part includes synchronous handover instructions, uplink and downlink TBF parameters dynamically assigned or extended dynamically assigned, packet handover reference (PS Handover reference), access Common parameters of the target cell, the core network part includes frame synchronization and encryption.

The above is the general flow of packet handover. Please refer to Figure 2, in which, before the SGSN receives the handover completion message sent by the BSS, the handover may be canceled due to various reasons, and the PFC deletion command is sent to the target cell, and the target cell executes the PFC deletion process. The switching cancellation process is as follows:

201. Before the SGSN receives the handover completion message sent by the BSS, the target BSS sends a packet handover cancellation message (PS Handover Cancel) to the SGSN;

There may be many reasons for this message to be sent, for example, it may be that the packet switching request has been sent in the above-mentioned packet switching step 102, but no stage is received between the packet switching command in step 108, or the packet is received in step 108 Handover command but handover failure, when the mobile station has returned to the source cell, it may send a packet handover cancel message;

202. The SGSN sends a delete BSS PFC command to the target BSS, requesting to delete the PFC;

203. The PFC is deleted successfully, and the target BSS returns a delete PFC confirmation response (DeletePFC Ack) to the SGSN.

In the above case, if the mobile station has successfully accessed the target cell, the target cell should not execute the SGSN PFC deletion procedure. However, in the prior art, the PFC deletion message sent by the target cell to the SGSN cannot distinguish whether it is the PFC deletion process caused by the handover cancellation or the end of the service. Cause business failure or data loss.

Contents of the invention

The technical problem to be solved by the present invention is to provide a processing method for preventing BSS from accidentally deleting a link and canceling packet handover.

The technical problem to be solved by the present invention is to provide a packet switching method for preventing the BSS from accidentally deleting a link.

In order to solve the above-mentioned first technical problem, the purpose of the present invention is achieved through the following technical solutions: provide a processing method for packet handover cancellation, including the steps: the base station receives a handover cancellation message for the mobile station; said handover cancellation message It is a delete base station packet flow context message carrying a handover cancellation indication; when the mobile station is not in the handover phase, the base station does not execute the handover cancellation process of the mobile station.

In order to solve the above-mentioned second technical problem, the object of the present invention is achieved through the following technical solutions: provide a packet switching method, including the steps: after the base station receives the packet switching request, assign and reserve a wireless network for the mobile station performing packet switching; resources; the base station receives a handover cancellation message for the mobile station; the handover cancellation message is a delete base station packet flow context message carrying a handover cancellation indication; when the mobile station is not in the handover phase, the base station does not execute the Describe the handover cancellation process of the mobile station.

It can be seen from the above first technical solution that by directly telling the base station that handover cancellation is required and allowing it to determine which stage the mobile station is in the handover phase, the base station should not delete the packet when the mobile station is no longer in the handover phase The flow context does not execute the handover cancellation procedure of the mobile station, and maintains the access of the mobile station. In this way, it is avoided that the handover has been successful, but the abnormal occurrence of radio resource release caused by the handover cancellation is avoided, and service failure is prevented.

It can be seen from the above second technical solution that by directly telling the base station that handover cancellation is required and allowing it to determine which stage the mobile station is in the handover phase, the base station should not delete the packet when the mobile station is no longer in the handover phase The flow context does not execute the handover cancellation procedure of the mobile station, and maintains the access of the mobile station. In this way, it is avoided that the handover has been successful, but the abnormal occurrence of radio resource release caused by the handover cancellation is avoided, and service failure is prevented.

Description of drawings

Fig. 1 is the flowchart of prior art packet handover;

Fig. 2 is the flowchart of prior art packet handover cancellation;

Fig. 3 is the flow chart of the embodiment of packet handover of the present invention;

Fig. 4 is a functional block diagram of an embodiment of the SGSN of the present invention.

Detailed ways

The basic principle of the present invention is: Aiming at the problem of inappropriate wireless resource release that may be caused by the cancellation of the handover after successful packet handover, the present invention proposes a method for distinguishing the deleted packet flow context message, which is carried in the deleted packet flow context message according to different situations. corresponding instructions. Inform BSS to make different treatments according to different situations. If the indication is handover cancellation and the MS is no longer in the handover phase, maintain the access of the MS.

The present invention proposes a basic implementation of a processing method for packet handover cancellation, including steps:

The base station receives a handover cancel message for the mobile station;

In the case that the mobile station is not in the handover phase, the base station does not execute the handover cancellation process of the mobile station.

The above basic implementation mode directly tells the base station that it needs to cancel the handover, and let it judge which stage the mobile station is in the handover phase. When the mobile station is no longer in the handover phase, the base station should not delete the packet flow context, and does not execute The handover cancellation process of the mobile station maintains the access of the mobile station. In this way, it is avoided that the handover has been successful, but the abnormal occurrence of radio resource release caused by the handover cancellation is avoided, and service failure is prevented.

The present invention also proposes a basic implementation of a method for deleting a base station packet flow context, including steps:

The service GPRS support node sends a delete packet flow context message carrying a cause value to the base station;

The base station judges whether to execute the action of deleting the packet flow context according to the cause value.

The above basic implementation mode tells the base station the reason for the deletion of the packet flow context message by carrying the cancellation reason value in the deletion packet flow context message, and the base station can judge the nature of the operation according to the reason value of the handover cancellation, if the operation is not If the mobile station is not in the handover phase due to the end of the service or the completion of the handover, the base station does not execute the handover cancellation process of the mobile station. In this way, it is avoided that the handover has been successful, but the abnormal occurrence of radio resource release caused by the handover cancellation is avoided, and service failure is prevented.

The present invention also proposes a basic implementation mode of a grouping switching method, including steps:

After receiving the packet switching request, the base station allocates and reserves wireless resources for the mobile station performing packet switching;

The base station receives a handover cancel message for the mobile station;

In the case that the mobile station is not in the handover phase, the base station does not execute the handover cancellation process of the mobile station.

For the technical effect of the foregoing packet switching method, reference may be made to the technical effect of the basic implementation manner of the method for processing packet switching cancellation of the present invention.

The present invention also proposes a basic implementation mode of the service GPRS support node. The service GPRS support node includes a message creating unit and a message sending unit, the message creating unit is used to create a delete packet flow context message carrying a cause value, and the message sending unit is used to delete the created packet flow context message It is sent to the base station, instructing the base station to judge whether to execute the action of deleting the packet flow context according to the cause value.

The above basic implementation mode tells the base station the reason for the deletion of the packet flow context message by adding the cancellation reason value in the deletion packet flow context message through the message creation unit, and the message sending unit instructs the base station to distinguish the operation according to the reason value of the handover cancellation property, when the mobile station is not in the handover phase, the base station does not execute the handover cancellation process of the mobile station. In this way, it is avoided that the handover has been successful, but the abnormal occurrence of radio resource release caused by the handover cancellation is avoided, and service failure is prevented.

The present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

Fig. 3 is a flow chart of a specific implementation of the packet switching method of the present invention, which also includes a specific implementation flow of a processing method of packet switching cancellation and a method of deleting a base station packet flow context. The packet switching in the figure includes two stages of preparation and execution, and the specific implementation process includes the following steps:

Preparatory phase for packet handover

Step 301: The source BSS determines to initiate packet handover;

There are many reasons for packet handover. For example, the source BSS can trigger packet handover according to the measurement report from the MS; the source BSS can also trigger packet handover according to the message that the MS actively reports the request for cell reselection, and the message that requires cell reselection You can wait until the packet cell update notification.

Step 302: the source BSS sends a packet switching request to the SGSN;

The packet handover request carries a handover cause value, a source cell ID, a target cell ID, and a container from the source BSS to the target BSS.

Step 303: After receiving the packet handover request, the SGSN determines according to the source cell identity and the target cell identity whether the current packet handover type is intra-BSS handover, intra-SGSN handover, or inter-SGSN handover, and performs subsequent operations according to the determined packet handover type;

If the current packet handover type is intra-BSS handover or intra-SGSN handover, the SGSN determines the target BSS according to the target cell ID and determines whether the routing area has changed. Get the temporary logical link ID, and then send a packet switching request to the target BSS, which carries P-TMSI, TTLI and PFCs to Be Setup List, and forwards the source BSS sent from the source BSS to the container of the target BSS , where the PFCs to Be Setup List is established by the SGSN according to the maximum bitrate parameter in QoS; if the RA has not changed, the SGSN directly sends a packet switching request to the target BSS.

If the current packet handover type is inter-SGSN handover, the source SGSN determines the target SGSN according to the target cell ID, and then interacts with the target SGSN to provide the target SGSN with information about the target cell ID and MS, and the target SGSN determines the target BSS according to the target cell ID, And send a packet handover request to the target BSS. The source SGSN is the SGSN that controls the source BSS where the MS resides before the packet handover, and the target SGSN is the SGSN that controls the target BSS where the MS resides after the packet handover.

Step 304: After receiving the packet handover request, the target BSS allocates and reserves wireless resources for the MS according to allocation strategies such as PFCs to Be Setup List and currently available wireless resources, and creates an information container from the target BSS to the source BSS;

Step 305: If the current packet handover type is intra-BSS handover or intra-SGSN handover, the target BSS sends a packet handover response to the SGSN, and the packet handover response carries information container information; if the packet handover type is inter-SGSN handover, the target BSS Send a packet switching response to the target SGSN, where the packet switching response carries information container information;

Execution Phase of Packet Handover

Step 306: If the current packet handover type is inter-SGSN handover, after the target SGSN receives the packet handover response, it sends handover information to the source SGSN, such as network service access point identification, GPRS tunnel protocol user plane identification; if the current packet handover If the type is intra-BSS handover or intra-SGSN handover, this step is omitted;

Step 307: The SGSN sends a packet switching response to the source BSS, notifying the source BSS to prepare for switching, and the packet switching response carries the content of the information container. If the current packet handover type is inter-SGSN handover, the SGSN described in this step is the source SGSN;

Step 308: After receiving the packet switching response, the source BSS stops the uplink service of the MS according to the QoS requirements, and then the source BSS interrupts the logical link control protocol data unit of the downlink TBF of the MS, and sends a packet switching command to the MS, notifying the MS to perform grouping Handover, the handover command carries the target BSS identifier;

Step 309: After the MS receives the packet handover command, it suspends the uplink user data, buffers or discards the uplink user data according to the QoS requirements of the current service, and then the MS starts to execute the handover command, and transfers to the time slot and wireless channel of the target cell according to the target BSS identifier and send a packet handover access message carrying a handover reference to the target BSS according to the packet handover command. The handover reference is used by the target cell to identify the MS, and according to the handover reference to determine whether the MS accesses, after the target cell allocates radio resources for the MS, it waits for the MS to access;

Step 310: After receiving the packet switching access message, the target BSS returns a packet physical information message to the MS, and the packet physical information message carries a TA to notify the MS of the correct TA. If the current packet switching type is synchronous packet switching, then this step can be omitted. Like this, this step must be executed when the current packet switching type is asynchronous packet switching, and is optional when the current packet switching type is synchronous packet switching;

Processing phase of packet handover cancel/delete base station packet flow context

Step 311: When the source BSS or other equipment sends a delete packet flow context message to the SGSN, or when the SGSN itself requires to suspend packet handover, the SGSN sends a delete packet flow context message carrying a cancellation reason value to the target BSS;

When the delete packet flow context message is sent by the source BSS, there may be many reasons for sending the message, for example, the packet switching request has been sent in the above packet switching step 302, but the packet switching command has not been received in step 308 Any stage between, or receive packet handover command but handover failure in step 308, when mobile station has got back to source cell, all may send delete packet flow context message;

The reason value is represented by an extension field indicating a reason for packet flow context deletion. The cause value is service end, handover cancel or handover complete. The handover cancellation reason value may be a mobile station loss or a non-mobile station loss reason value. Please refer to the following table for the context message and cause value of the above deleted packet flow:

cell type mode of existence Format length PDU type PDU type m V 1 TLLI TLLI m TLV 6 PFI PFI m TLV 3 Cause value Cause Value m TLV 3

Table 1: Delete packet flow context message

Table 2: Types of Cause Values

Step 312: The MS sends the RLC/MAC data block in normal burst format to the target BSS;

The MS starts to use the common burst format to resume the transmission of uplink LLC PDUs on the wireless channel allocated by the target BSS, such as location update requests.

If it is a synchronous handover, the MS can directly send an RLC/MAC data block in a common burst format to the target BSS without accessing the target BSS by sending a packet handover access message in step 309. In this way, the target BSS omits sending The step of grouping the physical information message accordingly, therefore, step 309 and step 310 can be omitted.

When the target BSS receives the first correct RLC/MAC data block in normal burst format from the MS, it sends a packet handover completion message to the SGSN through the Gb interface, notifying the SGSN that the packet handover has been completed.

Step 313: The BSS judges whether to execute the action of deleting the packet flow context according to the cause value; if the cause value is handover cancellation, and the MS corresponding to the handover is no longer in the handover phase, the handover cancellation of the MS is not performed Process, that is, do not delete the packet flow context, do not release radio resources, and maintain the access of the MS; meanwhile, the BSS can send a message indicating that the BSS has not deleted the packet flow context to the SGSN, so that the SGSN can confirm that it does not cancel the packet handover.

In the case that the cause value is the end of the service, execute the handover cancellation process of the MS, delete the packet flow context, and release the radio resource.

After receiving the delete packet flow context message from the SGSN, the target BSS parses the message and obtains the value of the handover cancellation reason. When the cause value is handover cancellation and the target BSS has received the first correct RLC/MAC data block in the common burst format from the MS in step 313, it is judged that the MS is not in the handover phase, and the PFC and the PFC are not cleared. The radio resources are used to maintain the access of the MS.

It can be seen from the above that because the radio resource is allocated and reserved for the MS performing packet handover in step 304, so that the MS accesses the target BSS in step 309 or 311, the source BSS or other devices for some reason When informing the target BSS that the handover needs to be canceled, the above-mentioned specific embodiment of the present invention informs the target BSS of the cause of the deletion of the packet flow context message by carrying the cancellation cause value in the delete packet flow context message sent by the SGSN to the target BSS in step 312, The target BSS judges the nature of the operation according to the reason value of the handover cancellation, and knows that the operation is not caused by the end of the service or the completion of the handover. If the mobile station is no longer in the handover phase, the base station does not perform the handover of the mobile station. Cancellation process. In this way, it is avoided that the handover has been successful, but the abnormal occurrence of radio resource release caused by the handover cancellation is avoided. At the same time, the packet switching process can be carried out smoothly to avoid abnormal occurrence.

After the target BSS in step 309 receives the packet handover access message sent by the MS, it can also be considered that the MS described in the present invention is no longer in the handover phase.

The invention also provides a specific implementation of the service GPRS support node. Referring to FIG. 4 , the SGSN includes a message creating unit 410 , a message sending unit 420 and a message receiving unit 430 .

The message creating unit 410 is used to create a delete packet flow context message carrying a cause value, specifically to create a delete packet flow context message named as a packet handover cancel message, and the cancellation cause value created by the packet flow context is deleted from the packet flow context. Reason value; more specifically used to create a packet handover cancel message that includes an extension field indicating a packet flow context deletion reason value, the reason value created by it is service end, handover cancellation or handover completion, and the handover cancellation reason value is mobile station loss or non-mobile station loss cause value.

The packet switching cancellation message indicates that the target BSS receives the first correct RLC/MAC data block of the MS in the normal burst format or the MS sends a packet switching completion message to the service GPRS support node 400, and the If the cause value is handover cancellation, the access of the MS is maintained.

The message sending unit 420 is configured to send the created delete packet flow context message to the target BSS, indicating that the target BSS is in the case that the MS corresponding to the handover is no longer in the handover phase and the cause value is handover cancellation, Maintaining access of the MS.

The message receiving unit 430 is configured to receive a message from the BSS indicating that the BSS has not deleted the packet flow context, so as to determine whether the base station cancels the handover procedure.

In operation, during the packet handover process, when the MS has accessed the target BSS, the source BSS or other equipment informs the target BSS that the handover needs to be canceled due to some reasons. At this time, the SGSN needs to send the delete packet flow context to the target BSS message, the message creation unit 410 on the SGSN creates a delete packet flow context message carrying the cancellation cause value, and then sends the message to the target BSS through the message sending unit 420 on the SGSN. After receiving the delete packet flow context message, the target BSS parses out that the handover cancellation reason value is handover cancellation, so it does not delete the packet flow context and maintains the access of the MS.

As can be seen from the above, the specific embodiment of the SGSN of the present invention uses the message creation unit 410 to add a cause value in the delete packet flow context message to tell the target BSS the reason for the deletion of the packet flow context message, and instructs the target BSS through the message sending unit 420 The nature of this operation is distinguished according to the cause value. When the MS is no longer in the handover phase, the packet flow context should not be deleted, and the access of the MS should be maintained. In this way, it is avoided that the handover has been successful, but the abnormal occurrence of radio resource release caused by the handover cancellation is avoided, and service failure is prevented.

The processing of a packet handover cancellation provided by the present invention, the deletion of PFC, the packet handover method, and the SGSN have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments It is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, The contents of this description should not be construed as limiting the present invention.

Claims (6)

1. the processing method of a packet switch cancellation is characterized in that, comprises step:

The handover cancelling message at travelling carriage is received in the base station; Described handover cancelling message is the deleting packet flow context of base station message of carrying the handover cancelling indication;

Be not under the switch step situation at this travelling carriage, the handover cancelling flow process of described travelling carriage is not carried out in the base station;

Wherein, described travelling carriage has not been in switch step and has comprised: described travelling carriage has been finished switching and has been linked into handover cancelling message corresponding district, perhaps first Radio Link control RLC/ media access control MAC data block correct, the normal burst form of described travelling carriage is received in the base station, and perhaps the base station sends the grouping handoff completion message to serving GPRS support node.

2. the processing method of packet switch cancellation according to claim 1 is characterized in that, described handover cancelling indication is that the former of indication deleting packet flow context of base station is because the extended field of handover cancelling.

3. the processing method of packet switch cancellation according to claim 1 is characterized in that, the handover cancelling flow process that described travelling carriage is not carried out in described base station comprises: the base station is not deleted the packet flow context of corresponding described travelling carriage and is not discharged related resource.

4. the processing method of packet switch cancellation according to claim 1, it is characterized in that the handover cancelling flow process that described travelling carriage is not carried out in described base station comprises: the base station sends the message that packet flow context is not deleted in the indication base station to serving GPRS support node.

5. a packet switch method is characterized in that, comprises step:

After the grouping handoff request is received in the base station, for the travelling carriage that divides into groups to switch distributes and the reservation Radio Resource;

The handover cancelling message at travelling carriage is received in described base station; Described handover cancelling message is the deleting packet flow context of base station message of carrying the handover cancelling indication; Be not under the switch step situation at this travelling carriage, the handover cancelling flow process of described travelling carriage is not carried out in the base station;

Wherein, described travelling carriage has not been in switch step and has comprised: described travelling carriage has been finished switching and has been linked into handover cancelling message corresponding district, perhaps first Radio Link control RLC/ media access control MAC data block correct, the normal burst form of described travelling carriage is received in the base station, and perhaps the base station sends the grouping handoff completion message to serving GPRS support node.

6. packet switch method according to claim 5 is characterized in that, the handover cancelling flow process that described travelling carriage is not carried out in described base station comprises: the base station sends the message that packet flow context is not deleted in the indication base station to serving GPRS support node.

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