CN103428787B - A kind of base station switch method and device - Google Patents

A kind of base station switch method and device Download PDF

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CN103428787B
CN103428787B CN201210154064.8A CN201210154064A CN103428787B CN 103428787 B CN103428787 B CN 103428787B CN 201210154064 A CN201210154064 A CN 201210154064A CN 103428787 B CN103428787 B CN 103428787B
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tmse
enodeb
source
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message
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CN103428787A (en
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王一唯
习建德
杨今明
常艳
蒋石竹
阮楠
李翔
任世岩
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Abstract

The invention discloses a kind of base station switch method and device, in order to reduce system signaling expense, reduce S1 interface switching process required time, thus improve the efficiency base station served for UE being switched to target eNode B by source eNodeB based on S1 interface.A kind of base station switch method provided by the invention comprises: the source cluster mobility session management entity TMSE being user equipment (UE) service, and the requirement being received as the source evolved base station eNodeB transmission that this UE serves switches message; Source TMSE switches message according to described requirement, and the base station served for UE is switched to target eNode B by source eNodeB.

Description

Base station switching method and device
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for switching base stations.
Background
An evolved node b (eNodeB, eNB) defined in an LTE system specified by 3GPP is switched with an S1 interface on a core network side, so that when handover based on an X2 interface between enodebs is not available, handover between enodebs can be initiated based on an S1 interface reference point, where this function is used in various scenarios when a relocation Mobility Management Entity (MME) is required in a handover process, or when both an MME and a serving gateway (S-GW) are required to be relocated, or the MME is not changed, but there is no X2 interface between enbs, a specific flow is shown in fig. 1 and includes steps 1 to 21 b.
In existing systems, the S1 interface handover procedure of a User Equipment (UE) is determined by a source eNodeB which Evolved Packet System (EPS) bearers are available to forward packet data to a target eNodeB, where packet forwarding includes downlink packets and uplink packets, where uplink packet forwarding is an option. The Evolved Packet Core (EPC) does not change the bearer list of eNodeB-determined packet forwarding. Packet forwarding may be from the source eNodeB to the target eNodeB via the X2 interface in a direct forwarding manner, or may be indirectly via the source S-GW and the target S-GW.
In summary, in the TD-LTE trunking system scheme in the prior art, the management of the original group call bearer is not considered in the S1 interface switching process, the system signaling overhead is large, and the time required for the S1 interface switching process is long.
Disclosure of Invention
The embodiment of the invention provides a base station switching method and a base station switching device, which are used for reducing the system signaling overhead and reducing the time required by the switching process of an S1 interface, so that the efficiency of switching a base station serving UE from a source eNodeB to a target eNodeB based on an S1 interface is improved.
The base station switching method provided by the embodiment of the invention comprises the following steps:
a source cluster mobility session management entity (TMSE) serving User Equipment (UE) receives a switching request message sent by a source evolution type base station (eNodeB) serving the UE;
and the source TMSE switches the base station serving the UE from the source eNodeB to the target eNodeB according to the switching requirement message.
The base station switching device provided by the embodiment of the invention comprises:
a handover request message receiving unit, configured to receive a handover request message sent by a source evolved node b eNodeB serving the UE;
and the switching unit is used for switching the base station serving the UE from the source eNodeB to the target eNodeB according to the switching requirement message.
In the embodiment of the invention, a source cluster mobile session management entity TMSE serving user equipment UE receives a request switching message sent by a source evolution type base station eNodeB serving the UE; and the source TMSE switches the base station serving the UE from the source eNodeB to the target eNodeB according to the switching requirement message, thereby reducing the system signaling overhead, reducing the time required by the switching process of the S1 interface and improving the efficiency of switching the base station serving the UE from the source eNodeB to the target eNodeB based on the S1 interface.
Drawings
Fig. 1 is a schematic diagram illustrating a handover procedure of an S1 interface based on 3GPP in the prior art;
fig. 2 is a schematic network architecture diagram of a TD-LTE broadband multimedia cluster according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a switching process of the S1 interface according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a TAU process provided by an embodiment of the present invention;
fig. 5 is a flowchart illustrating a base station handover method at a TMSE side according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a base station switching apparatus on a TMSE side according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a base station switching method and a base station switching device, which are used for reducing the system signaling overhead and reducing the time required by the switching process of an S1 interface, so that the efficiency of switching a base station serving UE from a source eNodeB to a target eNodeB based on an S1 interface is improved.
The network architecture of the TD-LTE broadband multimedia cluster based on the embodiment of the present invention is shown in fig. 2, and the network system includes a User Equipment (UE), an evolved node b (eNB), a cluster mobility session management entity (TMSE), a scheduling server, a Home Subscriber Server (HSS), and a scheduling console. The core network under the system architecture adopts a centralized idea, the functions of core network equipment (including MME/SGW/PGW) are unified by TMSE, and the TMSE directly controls all TD-LTE base station equipment under the jurisdiction so as to reduce signaling interaction in the group call establishment process.
In the trunking system according to the embodiment of the present invention, since the UE in the handover process may perform the trunking group call service at the same time, it is necessary to determine the group call state at the network side, and manage the downlink group call bearer with the eNodeB according to the corresponding policy.
The embodiment of the present invention provides an S1 interface switching process based on the network architecture shown in fig. 2, and referring to fig. 3, the process specifically includes the steps of:
a1, the source eNodeB decides to initiate a handover between the source eNodeB and the target eNodeB based on the S1 interface between the eNodeB and the TMSE (also called as S1 interface handover) according to the connection state of the X2 interface and the connection state of the target eNodeB.
The source eNodeB triggers the S1 interface handover procedure in this embodiment after receiving an S1 interface handover request initiated by a UE (hereinafter, referred to as UE, all are UEs initiating an S1 interface handover request).
A2, the source eNodeB sends a request handover message (HandoverRequired) to the source TMSE, the message carries the handover type, the validity of the direct forwarding path, the transparent container from the source eNodeB to the target eNodeB, the target eNodeB identifier, the target Tracking Area Identifier (TAI) and the reason of the S1application protocol (S1 application protocol, S1 AP).
Wherein a list of bearers on which to perform data forwarding is indicated in the transparent container.
Direct forwarding path validity, indicating whether direct data forwarding from the source eNodeB to the target eNodeB is possible, is based on the presence of the X2 interface between the source eNodeB and the target eNodeB.
The purpose of the target tracking area identification TAI is to indicate the selection of the appropriate target TMSE.
A3, source TMSE judges whether TMSE for UE service changes according to requirement switch message sent by source eNodeB, if yes, selects target TMSE according to target eNodeB identification carried in requirement switch message, and sends a forward relocation request message to target TMSE, wherein UE context in source TMSE, transparent container from source eNodeB to target eNodeB, Radio Access Network (RAN) cause value, target eNodeB identification, target tracking area identification TAI, Mobile Station (MS) information change behavior (if the identification is valid), and direct forward identification.
A4, if the TMSE serving the UE changes, that is, the TMSE needs to be relocated, the target TMSE allocates the target TMSE address and Tunnel Endpoint Identifier (TEID) of the uplink packet of the S1-U interface between the target eNodeB and the target TMSE, thereby realizing the establishment of a new bearer for the UE requesting the S1 interface switching.
I.e., the above steps A3 and a4, are required to be performed in case that the TMSE serving the UE changes.
A5, if the TMSE serving the UE changes, the target TMSE sends a handover request message to the target eNodeB, otherwise, the source TMSE may directly send a handover request message to the target eNodeB, where the handover request message carries an Evolved Packet System (EPS) bearer to be established, a UE-aggregate maximum bit rate (UE-AMBR), an S1AP cause value, a transparent container from the source eNodeB to the target eNodeB, and a handover restriction list.
The handover request message creates a UE context, including bearer information and security context, at the target eNodeB. For each EPS bearer, the EPS bearer to be established includes a target TMSE address and an uplink TEID for the user plane and an EPS bearer quality of service (QoS).
If the direct forwarding flag indicates that direct forwarding is not available and the target TMSE knows that there is no indirect data forwarding connection between the source eNodeB and the target eNodeB, the bearer parameters to be established must contain an indication that data forwarding is not possible.
A6, if TMSE serving UE changes, the target eNodeB sends a switching request response message to the target TMSE, otherwise, the target eNodeB sends the switching request response message to the source TMSE.
The handover request response message includes a handover type, a handover reason, an established bearer list, an established failed bearer list, and a UE-AMBR.
The EPS bearer establishment list includes eNodeB service IP address and TEID allocated by the target eNodeB for uplink and downlink packets of the S1-U interface, and eNodeB service IP address and TEID allocated for receiving and forwarding data. If the UE-AMBR changes, the target TMSE recalculates and transmits a new UE-AMBR to the target eNodeB. Otherwise, the target TMSE must reject the handover procedure and initiate the detach procedure and the delete session procedure.
A7, if the TMSE serving the UE changes, the source TMSE establishes forwarding parameters at the target TMSE by sending a create indirect data forwarding tunnel request message (which contains the tunnel id (teids) forwarded by the target eNodeB address) to the target TMSE.
A8, the target TMSE replies to create an indirect data forwarding tunnel response message (this message carries the cause value, the transparent container from the target eNodeB to the source eNodeB, the EPS bearer setup list, the target TMSE address and the forward TEIDs).
A9, corresponding to the above step A3, if the TMSE serving the UE changes, the target TMSE sends a forward relocation response message to the source TMSE. If indirect forwarding is used, the message contains the target TMSE address and TEID for indirect forwarding.
A10, corresponding to step a2 above, the source TMSE sends a handover command to the source eNodeB. The bearer parameters for forwarding data include the TMSE service IP address and TEID list allocated for data forwarding, and the bearer parameters for releasing include the bearer list for releasing.
A11, if the UE requesting S1 interface handover is also performing trunking service, for example, in a group call/multicast/single call, and there is no group call downlink bearer at S1 interface between the target eNodeB and the target TMSE, the target TMSE sends a group call context setup request message to the target eNodeB to set up downlink bearer for the group call of the user, where the message includes a TMSE cluster group S1 interface application identifier (S1 APID) (tmseltringinggroups1 APID) and a cluster identifier (TGID);
a12, the target eNodeB allocates downlink TEID for the cluster group according to the group call context establishment request message, and responds to the group call context establishment response, wherein the group call context establishment response comprises TMSETrunkingGroupS1APID and eNB cluster group S1APID (eNBrunkingGroupS 1 APID);
a13, corresponding to the step a10, the source eNodeB sends a handover command to the UE, specifically, a transparent container construction handover command (handover command) message from the target eNodeB to the source eNodeB may be used to send the handover command to the UE (i.e., the UE requesting S1 interface handover).
When the UE receives the handover command message, it deletes any EPS bearer that the target cell cannot accept.
A14, the source eNodeB sends an eNodeB state transmission message to the target eNodeB through the source TMSE (or the source TMSE and the target TMSE), and the message transfers the stored Packet Data Convergence Protocol (PDCP) and Hyper-frame number (HFN) state information corresponding to the Evolved-radio access bearer (E-RAB).
The source eNodeB may omit sending the message if none of the E-RABs employ the PDCP status preservation mechanism.
A15, if TMSE serving UE changes, source TMSE sends forward access context notification message (ForwardAccesContextNotification) to target TMSE, the message contains RAB context and E-UTRAN transmission container;
a16, target TMSE sends forward access context response message (ForwardAccess context acknowledgement) to source TMSE, which carries cause value.
A17, the source TMSE or the target TMSE sends an eNodeB status transfer (enodebs status transfer) message to the target eNodeB, where the message contains an eNB status transfer container.
The steps a14-a17 described above are optional steps, and are not essential steps of the S1 interface switching flow.
A18, after the UE successfully synchronizes to the target cell, sends a handover confirm (handover confirm) message to the target eNodeB. Downlink forwarding data from the source eNodeB is passed to the UE, while uplink data is sent out by the UE for forwarding to the target TMSE.
A19. The target eNodeB sends a handover notification (carrying TAI + ECGI)) message to the target TMSE.
A20, corresponding to step a9 above, if the TMSE serving the UE changes, the target TMSE sends a forward relocation complete (forwardrelocation complete) message to the source TMSE.
A21, the source TMSE sends a forward relocation complete acknowledge message to the target TMSE in response. A timer is started at the source TMSE to monitor the release of resources of the source eNodeB and the source TMSE. Upon receiving the forward relocation complete reply message, the target TMSE starts a timer for monitoring the user plane resources allocated by the target TMSE for indirect forwarding.
A22, the target TMSE modifies the bearing of the UE and the network side; the target TMSE allocates resources for the downlink traffic according to a bearer allocation address and a TEID principle.
A23. After step a19, the UE initiates a Tracking Area Update (TAU) procedure when one of the TAU update triggering conditions is met. The target TMSE is aware of a handover procedure performed for the UE because it receives the bearer context through a handover message, and thus the target TMSE performs only a subset of the TAU procedures, and in particular does not perform the normal context forwarding procedures between the source TMSE and the target TMSE.
A24. The source TMSE deletes the bearer of the UE requesting the S1 interface handover.
A25, when the start timer of the step a21 times out, the source TMSE sends a UE context release command (uecontextthreadeconcommand) message to the source eNodeB, which carries the release reason.
A26, the source eNodeB releases the resources associated with the UE and responds to a UE context release complete (uecontextelesetcomplete) message.
A27, if there is no other user of the cluster group under the source eNodeB, that is, the group bearer between the source eNodeB and the TMSE is not necessary, the source TMSE sends a group call context release command message to the source eNodeB;
a28, after the source eNodeB receives the group calling context release command message, deleting the group bearing context, and replying the group calling context release completion message to the source TMSE, wherein the message carries TMSETrunkingGroupS1APID and eNBrunkingGroupS 1 APID.
Steps a27 and a28 are steps corresponding to steps a11 and a12 described above.
A29, after the step a26, if indirect forwarding is used, the timer started at the step a21 by the source TMSE times out, and the source TMSE sends a delete indirect data forwarding tunneling request (deletediredtaforwardtunnelrequest) message to the target TMSE to release the temporary resources allocated for indirect forwarding by the step a 7.
A30, the target TMSE replies a delete indirect data forwarding tunnel response (DeleteIndexDataForwarding Tunnel response) message to the target TMSE to release the temporary resources allocated by the step A7 for indirect forwarding.
Steps a29 and a30 are steps corresponding to steps a7 and A8 described above.
In the above steps, the interaction flow between the source TMSE and the target TMSE is performed when the TMSE serving the UE requesting the interface switching of S1 is changed, if the TMSE serving the UE requesting the interface switching of S1 is not changed, the interaction flow between the source TMSE and the target TMSE does not exist, and the interaction flow between all the target TMSEs and the base station side is the interaction flow between the source TMSE and the base station side.
The TAU procedure, as shown in fig. 4, includes:
and B1, the UE sends a tracking area update request message to a new eNodeB (eNb-new, namely the target eNodeB) to initiate a TAU process, wherein RRC parameters are carried, and the RRC parameters comprise an old TMSE (the second TMSE) identifier and a PLMN identifier.
B2. The new eNodeB derives a new TMSE (the first TMSE mentioned above) identity from the old TMSE identity in the RRC parameters and the indicated selected network parameter TAI, or if no new TMSE identity is available, the new eNodeB selects a TMSE. The new eNodeB then forwards the TAU request message to the new TMSE, carrying the TAI, ECGI parameters and the UE's old globally unique temporary identity (OldGUTI).
B3. And if the integrity protection verification of the TAU request message is successful, the new TMSE must send a context request message to the old TMSE, wherein the context request message comprises the old GUTI, the complete TAU request message, the MME address and the UE confirmation identifier. The new TMSE sends a context request message to the old TMSE to obtain subscriber information. The new TMSE obtains an old globally unique Mobile Management Entity (MME) identity (GUMMEI) from an old Globally Unique Temporary Identity (GUTI).
B4. The old TMSE performs integrity protection verification on a context request message sent by the new TMSE (the verification algorithm follows the verification algorithm of the existing 3GPP standard), and if the verification is successful, the old TMSE returns a context response message including an IMSI, a mobile station national PSTN/ISDN number (MSISDN), an unused EPS authentication vector, an access security management entity Key Set Identity (KSIASME), an access security management entity key (keyaccesssecuritymanagentimententity, smkame), an EPS bearer context, a serving gateway (serving gw) signaling address, one or more Tunnel Endpoint Identities (TEIDs), a Mobile Station (MS) information change report, a UE core network capability, and a UE Discontinuous Reception (DRX) parameter.
B5. If the integrity check of the TAU request message fails, the new TMSE must initiate an authentication procedure and an encryption procedure for the UE by the HSS (both procedures employ the corresponding procedures defined by the existing 3GPP standards).
B6. The new TMSE sends a context response message to the old TMSE, wherein the message contains a cause value and a SeringGW change indication. The old TMSE marks in its context that the information in the gateway and Home Subscriber Server (HSS) is invalid, thereby ensuring that the gateway and HSS can be updated when the UE returns to the old TMSE to initiate a TAU procedure before the TAU procedure is completed.
B6-1, the new TMSE updates the load bearing of the UE according to the received context response message;
b7, if the UE requesting TAU is also performing trunking service, for example, in a group call/multicast/single call, and there is no group call downlink bearer in the S1 interface between the new eNodeB and the new TMSE, the new TMSE sends a group call context setup request message to the new eNodeB to set up downlink bearer for the group call of the UE, where the group call context setup request message includes: TMSE cluster group S1 interface application ID (S1 APID) (TMSETrunkingGroupS 1 APID) and cluster group identification (TGID);
b8, the new eNodeB allocates a downlink Tunnel Endpoint Identifier (TEID) to the cluster group according to the TGID in the group call context establishment request message, and responds to the group call context establishment response, wherein the response includes the tmsretringkingroups 1APID and the eNB cluster S1APID (eNBTrunkingGroupS 1 APID);
b9, if no other UE except the UE in the cluster group to which the UE belongs exists under the old eNodeB (eNb-old, i.e. the source eNodeB mentioned above), i.e. the group bearer between the source eNodeB and the old TMSE, does not exist, the old TMSE sends a group call context release order message to the source eNodeB, where the message carries the tmsretrunkinggroups 1APID and eNBTrunkingGroupS1 APID;
b10, after the source eNodeB receives the group call context release command message, it deletes the bearer context of the cluster group and returns the group call context release completion message to the old TMSE.
B11. The new TMSE checks the bearing state parameter of an Evolved Packet System (EPS) in the UE bearing context message obtained from the old TMSE according to the bearing information carried in the context response message responded by the old TMSE, releases the EPS bearing which is not activated and updates the EPS bearing according to the EPS bearing state parameter; and, the new TMSE sends a location update request to the HSS for updating the location data of the subscriber.
Hss sends a location delete message to the old TMSE carrying the UPDATE type and IMSI of the MME UPDATE PROCEDURE (MME _ UPDATE _ PROCEDURE (0)).
B13. After receiving the location deletion message (carrying the UPDATE type and IMSI of MME _ UPDATE _ PROCEDURE (0)), the old TMSE deletes the record of the user stored in the old TMSE, and replies a location deletion response message to the HSS.
And B14, after receiving the location deletion response message, the HSS responds to the new TMSE with a location update response message, wherein the message carries the IMSI and subscription data (SubscriptionData).
B15. If the new TMSE does not allow the UE to access to its selected Tracking Area (TA) area due to area subscription restriction or access restriction, the new TMSE rejects the TAU request message for the reason of tracking area not allowed. Otherwise, the new TMSE responds to the UE with a tracking area update accept message, which carries the GUTI, the TAI list (list), the EPS bearer status (bearerstatus), the NAS sequence number (sequence number), and the NAS-MAC.
B16. If the TMSE to which the UE belongs (i.e. the TMSE serving the UE) changes, the new TMSE allocates a new GUTI to the UE, which means that the GUTI of the UE changes, and at this time, the UE needs to return a tracking area update accept response message to the new TMSE to confirm that the tracking area update procedure is completed.
Therefore, on the TMSE side, referring to fig. 5, a base station handover method provided in the embodiment of the present invention includes the steps of:
s101, a source cluster mobility session management entity (TMSE) serving User Equipment (UE) receives a switching request message sent by a source evolution type base station (eNodeB) serving the UE;
and S102, the source TMSE switches the base station serving the UE from the source eNodeB to the target eNodeB according to the switching request message.
Preferably, the source TMSE, according to the handover request message, handing over the base station serving the UE from the source eNodeB to the target eNodeB, includes:
the source TMSE informs the target eNodeB of the need of switching between the source eNodeB and the target eNodeB according to the switching request message;
the source TMSE sends a switching command to the source eNodeB, and the switching command is sent to the UE through the source eNodeB;
the source TMSE receives the switching notification message sent by the target eNodeB, or when the TMSE serving the UE changes, the target TMSE receives the switching notification message sent by the target eNodeB, and then executes the tracking area updating process;
and the source TMSE deletes the bearer of the UE and executes the process of releasing the context of the UE on the source eNodeB, thereby realizing that the base station serving the UE is switched from the source eNodeB to the target eNodeB.
Preferably, the source TMSE notifies the target eNodeB of the need for handover between the source eNodeB and the target eNodeB according to the handover request message, including:
when TMSE serving UE changes, source TMSE selects target TMSE according to the switching request message, and sends forward relocation request message to target TMSE;
the target TMSE establishes a new bearer for the UE according to the forwarding relocation request message;
the target TMSE sends a switching request message to the target eNodeB;
the target TMSE receives the switching request response message returned by the target eNodeB.
Preferably, after the source TMSE sends the forward relocation request message to the target TMSE, the method further comprises:
the source TMSE establishes a forwarding parameter in the target TMSE by sending a request message for establishing an indirect data forwarding tunnel to the target TMSE;
the target TMSE replies a response message for creating an indirect data forwarding tunnel to the source TMSE;
the target TMSE sends a forward relocation response message to the source TMSE.
Preferably, after the target TMSE sends a forward relocation response message to the source TMSE, the method further comprises:
if the UE needs to perform cluster service and no group calling downlink bearer exists at an S1 interface between a target eNodeB and a target TMSE, the target TMSE sends a group calling context establishment request message to the target eNodeB to establish the downlink bearer for the group calling of the UE;
and the target TMSE receives the group call context establishment response sent by the target eNodeB.
Preferably, after the source TMSE sends the handover command to the source eNodeB, the method further includes:
the source TMSE forwards eNodeB status transfer messages from the source eNodeB to the target eNodeB.
Preferably, when the TMSE serving the UE changes, the source TMSE forwards eNodeB status transfer messages from the source eNodeB to the target eNodeB, including:
the source TMSE receives an eNodeB state transmission message from a source eNodeB;
the source TMSE sends a forward shifting access context notification message to the target TMSE;
the target TMSE sends a forward access context response message to the source TMSE;
the target TMSE sends an eNodeB status transfer message to the target eNodeB.
Preferably, when the TMSE serving the UE changes, after the target TMSE receives the handover notification message sent by the target eNodeB, the method further includes:
the target TMSE sends a forward relocation completion message to the source TMSE;
the source TMSE sends a forward relocation completion response message to the target TMSE;
and the target TMSE updates the load of the UE and the network side.
Preferably, the source TMSE performs a procedure for releasing the context of the UE on the source eNodeB, including:
the source TMSE sends a UE context release command message to the source eNodeB;
and the source TMSE receives the UE context release completion message replied by the source eNodeB.
Preferably, after the source TMSE performs a procedure of releasing the context of the UE on the source eNodeB, the method further includes:
if the source eNodeB does not have other UEs of the cluster group to which the UE belongs, the source TMSE sends a group call context release command message to the source eNodeB;
and the source TMSE receives the group call context release completion message replied by the source eNodeB.
Preferably, after the source TMSE performs a procedure of releasing the context of the UE on the source eNodeB, the method further includes:
the source TMSE sends a request message for deleting the indirect data forwarding tunnel to the target TMSE;
the target TMSE replies with a delete indirect data forwarding tunnel response message to the target TMSE.
Correspondingly, on the TMSE side, referring to fig. 6, an embodiment of the present invention provides a base station switching apparatus, including:
a handover request message receiving unit 11, configured to receive a handover request message sent by a source eNodeB serving the UE;
and a handover unit 12, configured to handover, according to the handover request message, a base station serving the UE from the source eNodeB to the target eNodeB.
Preferably, the switching unit 12 is specifically configured to:
informing the target eNodeB of the need of switching between the source eNodeB and the target eNodeB according to the switching request message;
sending a switching command to a source eNodeB, and sending the switching command to the UE through the source eNodeB;
receiving a switching notification message sent by a target eNodeB, or when a TMSE serving the UE changes, serving as a target TMSE side, receiving the switching notification message sent by the target eNodeB, and then executing a tracking area updating process;
and deleting the bearer of the UE, and executing the process of releasing the context of the UE on the source eNodeB, thereby realizing that the base station serving the UE is switched to the target eNodeB from the source eNodeB.
Preferably, the handover unit 12, according to the handover request message, is specifically configured to, when notifying the target eNodeB that the handover between the source eNodeB and the target eNodeB needs to be performed:
sending a switching request message to a target eNodeB, and receiving a switching request response message replied by the target eNodeB; or,
when TMSE serving UE changes, according to the switching request message, selecting target TMSE, and sending forward relocation request message to target TMSE.
Preferably, the apparatus further comprises:
a relocation processing unit 13, configured to receive a forward relocation request message sent by a source TMSE; establishing a new bearer for the UE according to the forwarding relocation request message; sending a switching request message to a target eNodeB; and receiving a switching request response message replied by the target eNodeB.
Preferably, the apparatus further comprises:
a request creation indirect data forwarding tunnel unit 14, configured to establish a forwarding parameter in the target TMSE by sending a request message for creating an indirect data forwarding tunnel to the target TMSE; receiving a response message of establishing an indirect data forwarding tunnel replied by the target TMSE;
the switching unit is further configured to: and receiving a forwarding relocation response message sent by the target TMSE.
Preferably, the apparatus further comprises:
the response unit 15 for creating an indirect data forwarding tunnel is used for receiving a request message for creating an indirect data forwarding tunnel sent by the source TMSE, and realizing the establishment of forwarding parameters in the target TMSE; replying a response message for creating an indirect data forwarding tunnel to the source TMSE;
the relocation processing unit 13 is further configured to send a forward relocation response message to the source TMSE.
Preferably, the apparatus further comprises:
a group call establishing unit 16, configured to send a group call context establishment request message to a target eNodeB to establish a downlink bearer for a group call of the UE if the UE needs to perform a trunking service and there is no group call downlink bearer at an S1 interface between the target eNodeB and the target TMSE; and receiving a group call context establishment response sent by the target eNodeB.
Preferably, the apparatus further comprises:
a first eNodeB status transmission unit 17, configured to forward an eNodeB status transmission message from the source eNodeB to the target eNodeB.
Preferably, when the TMSE serving the UE changes, the first eNodeB status transmission unit 17 is specifically configured to:
receiving an eNodeB status transmission message from a source eNodeB;
sending a forward access context notification message to a target TMSE;
receiving a forwarded access context response message sent by the target TMSE.
Preferably, the apparatus further comprises:
a second eNodeB state transmission unit 18, configured to receive a forward access context notification message sent by a source TMSE; sending a forward access context response message to the source TMSE; and sending the eNodeB state transmission message to the target eNodeB.
Preferably, when the TMSE serving the UE changes and receives, as the target TMSE side, the handover notification message sent by the target eNodeB, the handover unit 12 is further configured to:
sending a forward relocation complete message to a source TMSE;
receiving a forward relocation completion response message sent by a source TMSE;
and updating the bearing between the UE and the network side.
Preferably, when the handover unit 12 executes a process of releasing the context of the UE on the source eNodeB, it is specifically configured to:
sending a UE context release command message to a source eNodeB;
and receiving the UE context release completion message replied by the source eNodeB.
Preferably, after the handover unit 12 performs the procedure of releasing the context of the UE on the source eNodeB, it is further configured to:
if the source eNodeB does not have other UEs of the cluster group to which the UE belongs, sending a group call context release command message to the source eNodeB;
and receiving a group call context release completion message replied by the source eNodeB.
Preferably, after the handover unit 12 performs the procedure of releasing the context of the UE on the source eNodeB, it is further configured to:
sending a request message for deleting the indirect data forwarding tunnel to a target TMSE;
and receiving a response message of the target TMSE replying to the indirect data forwarding tunnel deletion.
The above units may be located in the same TMSE, that is, the same TMSE may implement the function of the UE's source TMSE or the UE's target TMSE.
In summary, the embodiment of the present invention provides an S1 interface handover process based on a TD-LTE broadband multimedia cluster architecture, where in the S1 interface handover process, if the UE requesting the base station handover is still performing a cluster service at the same time, and there is no group call downlink bearer in the S1 interface between the target eNodeB and the target TMSE, the target TMSE sends a group call context establishment request message to the target eNodeB to establish a downlink bearer for the group call of the user; if there is no other user of the cluster group under the source eNodeB, that is, there is no need for the group bearer between the source eNodeB and the source TMSE, the source TMSE sends a group call context release command message to the source eNodeB. By the scheme, the cluster group call users in an EPS connection management (ECM-CONNECTED) state can be ensured to simultaneously manage and ensure the downlink load of the group call in the switching process of the S1 interface, the system signaling overhead is reduced, and the switching delay is reduced.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (23)

1. A method for switching base stations, the method comprising:
a source cluster mobility session management entity (TMSE) serving User Equipment (UE) receives a switching request message sent by a source evolution type base station (eNodeB) serving the UE;
the source TMSE switches the base station serving the UE from the source eNodeB to the target eNodeB according to the switching requirement message;
wherein, the source TMSE switches the base station serving the UE from the source eNodeB to the target eNodeB according to the handover request message, including:
the source TMSE informs the target eNodeB of the need of switching between the source eNodeB and the target eNodeB according to the switching request message;
the source TMSE sends a switching command to the source eNodeB, and the switching command is sent to the UE through the source eNodeB;
the source TMSE receives the switching notification message sent by the target eNodeB, or when the TMSE serving the UE changes, the target TMSE receives the switching notification message sent by the target eNodeB, and then executes the tracking area updating process;
and the source TMSE deletes the bearer of the UE and executes the process of releasing the context of the UE on the source eNodeB, thereby realizing that the base station serving the UE is switched from the source eNodeB to the target eNodeB.
2. The method of claim 1, wherein the source TMSE notifies the target eNodeB of the need for handover between the source eNodeB and the target eNodeB according to the handover required message, comprising:
when TMSE serving UE changes, source TMSE selects target TMSE according to the switching request message, and sends forward relocation request message to target TMSE;
the target TMSE establishes a new bearer for the UE according to the forwarding relocation request message;
the target TMSE sends a switching request message to the target eNodeB;
the target TMSE receives the switching request response message returned by the target eNodeB.
3. The method of claim 2 wherein after the source TMSE sends a forward relocation request message to the target TMSE, the method further comprises:
the source TMSE establishes a forwarding parameter in the target TMSE by sending a request message for establishing an indirect data forwarding tunnel to the target TMSE;
the target TMSE replies a response message for creating an indirect data forwarding tunnel to the source TMSE;
the target TMSE sends a forward relocation response message to the source TMSE.
4. The method of claim 3 wherein after the target TMSE sends a forward relocation response message to the source TMSE, the method further comprises:
if the UE needs to perform cluster service and no group calling downlink bearer exists at an S1 interface between a target eNodeB and a target TMSE, the target TMSE sends a group calling context establishment request message to the target eNodeB to establish the downlink bearer for the group calling of the UE;
and the target TMSE receives the group call context establishment response sent by the target eNodeB.
5. The method of claim 1, wherein after the source TMSE sends a handover command to the source eNodeB, the method further comprises:
the source TMSE forwards eNodeB status transfer messages from the source eNodeB to the target eNodeB.
6. The method of claim 5, wherein when the TMSE serving the UE changes, the source TMSE forwards eNodeB status transfer messages from the source eNodeB to the target eNodeB, comprising:
the source TMSE receives an eNodeB state transmission message from a source eNodeB;
the source TMSE sends a forward shifting access context notification message to the target TMSE;
the target TMSE sends a forward access context response message to the source TMSE;
the target TMSE sends an eNodeB status transfer message to the target eNodeB.
7. The method of claim 1, wherein when the TMSE serving the UE changes, after the target TMSE receives a handover notification message sent by the target eNodeB, the method further comprises:
the target TMSE sends a forward relocation completion message to the source TMSE;
the source TMSE sends a forward relocation completion response message to the target TMSE;
and the target TMSE updates the load of the UE and the network side.
8. The method of claim 1, wherein a source TMSE performs a procedure to release context of the UE at a source eNodeB, comprising:
the source TMSE sends a UE context release command message to the source eNodeB;
and the source TMSE receives the UE context release completion message replied by the source eNodeB.
9. The method of claim 1, wherein after the source TMSE performs the process of releasing the context of the UE at the source eNodeB, the method further comprises:
if the source eNodeB does not have other UEs of the cluster group to which the UE belongs, the source TMSE sends a group call context release command message to the source eNodeB;
and the source TMSE receives the group call context release completion message replied by the source eNodeB.
10. The method of claim 1, wherein after the source TMSE performs the process of releasing the context of the UE at the source eNodeB, the method further comprises:
the source TMSE sends a request message for deleting the indirect data forwarding tunnel to the target TMSE;
the target TMSE replies with a delete indirect data forwarding tunnel response message to the target TMSE.
11. A base station switching apparatus, comprising:
a request switching message receiving unit, configured to receive a request switching message sent by a source evolved node b eNodeB serving a user equipment UE;
a switching unit, configured to switch a base station serving the UE from a source eNodeB to a target eNodeB according to the handover request message;
wherein, the switching unit is specifically configured to:
informing the target eNodeB of the need of switching between the source eNodeB and the target eNodeB according to the switching request message;
sending a switching command to a source eNodeB, and sending the switching command to the UE through the source eNodeB;
receiving a switching notification message sent by a target eNodeB, or when a TMSE serving the UE changes, serving as a target TMSE side, receiving the switching notification message sent by the target eNodeB, and then executing a tracking area updating process;
and deleting the bearer of the UE, and executing the process of releasing the context of the UE on the source eNodeB, thereby realizing that the base station serving the UE is switched to the target eNodeB from the source eNodeB.
12. The apparatus of claim 11, wherein the handover unit, when notifying the target eNodeB that the handover between the source eNodeB and the target eNodeB is required according to the handover request message, is specifically configured to:
sending a switching request message to a target eNodeB, and receiving a switching request response message replied by the target eNodeB; or,
when TMSE serving UE changes, according to the switching request message, selecting target TMSE, and sending forward relocation request message to target TMSE.
13. The apparatus of claim 12, further comprising:
a relocation processing unit, which is used for receiving a forwarding relocation request message sent by a source TMSE; establishing a new bearer for the UE according to the forwarding relocation request message; sending a switching request message to a target eNodeB; and receiving a switching request response message replied by the target eNodeB.
14. The apparatus of claim 13, further comprising:
the request establishing indirect data forwarding tunnel unit is used for realizing the establishment of forwarding parameters in the target TMSE by sending a request message for establishing the indirect data forwarding tunnel to the target TMSE; receiving a response message of establishing an indirect data forwarding tunnel replied by the target TMSE;
the switching unit is further configured to: and receiving a forwarding relocation response message sent by the target TMSE.
15. The apparatus of claim 14, further comprising:
the system comprises a response unit for establishing an indirect data forwarding tunnel, a response unit for receiving a request message for establishing the indirect data forwarding tunnel sent by a source TMSE, and a forwarding parameter established in a target TMSE; replying a response message for creating an indirect data forwarding tunnel to the source TMSE;
the relocation processing unit is further configured to send a forward relocation response message to the source TMSE.
16. The apparatus of claim 15, further comprising:
a group call establishing unit, configured to send a group call context establishment request message to a target eNodeB to establish a downlink bearer for a group call of the UE, if the UE needs to perform a trunking service and there is no downlink bearer for the group call at an S1 interface between the target eNodeB and the target TMSE; and receiving a group call context establishment response sent by the target eNodeB.
17. The apparatus of claim 11, further comprising:
and the first eNodeB state transmission unit is used for forwarding the eNodeB state transmission message from the source eNodeB to the target eNodeB.
18. The apparatus of claim 17, wherein when a TMSE serving the UE changes, the first eNodeB state transmission unit is specifically configured to:
receiving an eNodeB status transmission message from a source eNodeB;
sending a forward access context notification message to a target TMSE;
receiving a forwarded access context response message sent by the target TMSE.
19. The apparatus of claim 18, further comprising:
a second eNodeB state transmission unit, which is used for receiving the forwarding access context notification message sent by the source TMSE; sending a forward access context response message to the source TMSE; and sending the eNodeB state transmission message to the target eNodeB.
20. The apparatus of claim 11, wherein the handover unit, when the TMSE serving the UE changes and receives a handover notification message sent by a target eNodeB as the target TMSE side, is further configured to:
sending a forward relocation complete message to a source TMSE;
receiving a forward relocation completion response message sent by a source TMSE;
and updating the bearing between the UE and the network side.
21. The apparatus according to claim 11, wherein the handover unit, when performing the procedure of releasing the context of the UE on the source eNodeB, is specifically configured to:
sending a UE context release command message to a source eNodeB;
and receiving the UE context release completion message replied by the source eNodeB.
22. The apparatus of claim 11, wherein the handover unit, after performing the procedure of releasing the context of the UE on the source eNodeB, is further configured to:
if the source eNodeB does not have other UEs of the cluster group to which the UE belongs, sending a group call context release command message to the source eNodeB;
and receiving a group call context release completion message replied by the source eNodeB.
23. The apparatus of claim 11, wherein the handover unit, after performing the procedure of releasing the context of the UE on the source eNodeB, is further configured to:
sending a request message for deleting the indirect data forwarding tunnel to a target TMSE;
and receiving a response message of the target TMSE replying to the indirect data forwarding tunnel deletion.
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