WO2011113210A1

WO2011113210A1 - Method and device for local switching among multiple base stations

Info

Publication number: WO2011113210A1
Application number: PCT/CN2010/071163
Authority: WO
Inventors: 钱荣福; 徐浩; 孔令山; 吕平宝; 韦宇; 汪云华; 马红
Original assignee: 上海贝尔股份有限公司; 阿尔卡特朗讯
Priority date: 2010-03-19
Filing date: 2010-03-19
Publication date: 2011-09-22
Also published as: CN102687558A; CN102687558B

Abstract

A method and device for local switching among multiple base stations are disclosed in the present invention. According to one of the embodiments of the present invention, a method for realizing local switching in the base station is provided, wherein the called party accesses the base station, the method includes the following steps: (S113) receiving a message carrying a local switching information from a serving gateway; (S114) according to the local switching information, determining whether there is an available connection based on an X2 interface between the base station and the base station that the calling party accesses; (S115) if there is an available connection based on the X2 interface between the base station and the base station that the calling party accesses, then initiating to establish the connection based on the X2 interface with the base station that the calling party accesses. By the application of the method and the device in the present invention, the X2 interface between the base stations can be used effectively to realize the local data switching and the handover, and thus saving the backhaul link resource in the radio communication system as a whole, and reducing the network transmission cost of the communication between the users averagely.

Description

Method and device for local exchange between multiple base stations

The present invention relates to wireless communication technologies, and more particularly to a method and apparatus for local exchange of base stations. Background technique

In the current Long Term Evolution (LTE) network, after a service is successfully established, the data path of the service will pass through a Serving Gateway (SGW) node.

Some studies on the Global System for Mobile Communications (GSM) network show that on average, 30% or more of all calls handled by a base station controller (BSC) are local calls. It is conceivable that the situation in an LTE network is similar to the situation in a GSM network. In some densely populated areas and remote rural areas, most calls (calling and called) occur in the same base station or group of base stations. According to the existing LTE protocol, the data of two users must be exchanged by the serving gateway node, even if the two users face each other. Therefore, local calls occupy a large amount of backhaul link resources, and also make local calls cost high network transmission costs. Summary of the invention

In order to overcome the above-mentioned drawbacks in the prior art, the present invention proposes a method and apparatus for realizing local exchange between multiple base stations by using an X2 interface.

According to an aspect of the present invention, a method for implementing local switching in a base station, wherein a called party accesses the base station is provided, the method comprising the steps of: receiving a message carrying a local exchange information from a serving gateway, The local exchange information includes: a calling party identifier, an enhanced wireless access information corresponding to the calling party and the called party; and determining, by the local exchange information, the base station and the calling party Whether there is an available X2 interface-based connection between the accessed base stations; if there is an available X2 interface-based connection between the base station and the base station to which the calling party is connected, initiate establishment and the calling An X2-interface based connection between base stations to which the party is connected. According to still another aspect of the present invention, a method for implementing local switching in a base station is provided, wherein a calling party accesses the base station, the method comprising the steps of: receiving X2 based on a base station accessed by the called party A connection establishment request for local exchange of the interface; and a connection establishment response for local exchange based on the X2 interface is sent to the base station accessed by the called party.

According to still another aspect of the present invention, a method for implementing local switching in a serving gateway is provided, including the steps of: determining whether a base station accessed by a calling party and a base station accessed by a called party access the same The serving gateway, if yes, sends a message carrying local exchange information to the base station accessed by the called party; the local exchange information includes: a calling party identifier, an enhanced wireless corresponding to the calling party and the called party ID of the access bearer.

According to still another aspect of the present invention, a method for implementing handover in a base station is provided, comprising the steps of: receiving a handover request regarding communication between a first user equipment and a second user equipment; determining the base station and the Whether there is an available X2 interface-based connection between the base stations to which the second user equipment is connected; if there is an available X2 interface-based connection between the base station and the base station to which the second user equipment is connected, Initiating a connection based on the χ2 interface between the base station to which the second user equipment is connected, the connection is used to carry the communication between the first user equipment and the second user equipment.

According to still another aspect of the present invention, a method for implementing handover in a base station is provided, wherein a first user equipment accesses the base station, the method comprising the steps of: transmitting, to another base station, about the first user a handover request for communication between the device and the second user equipment; receiving a handover request acknowledgement from the another base station; stopping transmitting data of the first user equipment to the second user equipment.

According to still another aspect of the present invention, a first switching device that implements local switching in a base station is provided, wherein a called party accesses the base station, and the first switching device includes: a first receiving device, configured to receive a message carrying the local exchange information from the serving gateway, where the local exchange information includes: a calling party identifier, an identifier of the enhanced radio access bearer corresponding to the calling party and the called party, and a first determining device, configured to Determining, by the local exchange information, whether there is an available X2 interface-based connection between the base station and the base station to which the calling party is connected; the first processing device is configured to: if the base station and the calling party If there is an available X2 interface-based connection between the connected base stations, then Establishing an X2-interface based connection with the base station to which the calling party is connected.

According to still another aspect of the present invention, a second switching device for implementing local switching in a base station is provided, wherein a calling party accesses the base station, and the second switching device includes: a second receiving device, configured to receive The X2 interface-based connection establishment request for the local exchange from the base station to which the called party is connected; the first response device, configured to send the X2 interface based on the X2 interface to the base station accessed by the called party for local exchange The connection establishes a response.

According to still another aspect of the present invention, a third switching apparatus for implementing local switching in a serving gateway is provided, including: a second processing apparatus, configured to: determine that a base station and a called party accessed by a calling party are connected Whether the incoming base station accesses the serving gateway, and if yes, sends a message carrying the local exchange information to the base station accessed by the called party; the local exchange information includes: a calling party identifier, a calling party, and The identifier of the enhanced radio access bearer corresponding to the called party.

According to still another aspect of the present invention, a first switching apparatus for implementing handover in a base station is provided, including: a third receiving apparatus, configured to receive a handover related to communication between a first user equipment and a second user equipment And a second determining means, configured to determine whether there is an available X2 interface-based connection between the base station and the base station to which the second user equipment is connected; An X2 interface-based connection between the base stations accessed by the second user equipment is established, and an X2 interface-based connection between the base station and the base station accessed by the second user equipment is initiated, and the connection is used for The communication between the first user equipment and the second user equipment is carried.

According to still another aspect of the present invention, a second switching apparatus that implements handover in a base station is provided, wherein a first user equipment accesses the base station, and the second switching apparatus includes: a first sending apparatus, configured to Another base station sends a handover request for communication between the first user equipment and the second user equipment; a fourth receiving device, configured to receive a handover request acknowledgement from the another base station; and a fourth processing device, Stop sending data of the first user equipment to the second user equipment.

By using the method and apparatus of the present invention, it is possible to effectively utilize between base stations

The X2 interface implements local data exchange and handover, which generally saves backhaul link resources in the wireless communication system, reduces data transmission delay, and reduces the average between users. The network transmission cost of communication. DRAWINGS

The system will be better understood with reference to the figures and description below. The components in the figures are not necessarily drawn to scale, but rather are used to illustrate the principles of a typical model. Throughout the drawings, like reference characters have

1 shows a flow chart of a method for implementing local switching in a mobile communication network in accordance with one embodiment of the present invention;

2 shows a flow chart of a method for implementing handover in a mobile communication network in accordance with an embodiment of the present invention;

3 is a flow chart showing a method of implementing handover in a mobile communication network in accordance with an embodiment of the present invention;

4 is a block diagram showing the structure of a first switching device that implements local switching in a base station according to an embodiment of the present invention;

FIG. 5 is a block diagram showing the structure of a second switching device that implements local switching in a base station according to an embodiment of the present invention; FIG.

6 is a block diagram showing the structure of a third switching device that implements local switching in a serving gateway according to an embodiment of the present invention;

FIG. 7 is a block diagram showing the structure of a first switching device that implements handover in a base station according to an embodiment of the present invention;

FIG. 8 is a block diagram showing the structure of a second switching device that implements handover in a base station according to an embodiment of the present invention. detailed description

Without loss of generality, the following embodiments of the present invention are all applied to LTE networks. Those skilled in the art will appreciate that the core and real shields of the present invention can also be applied to other mobile communication networks.

1 shows a flow chart of a method of implementing local exchange in a mobile communication network in accordance with one embodiment of the present invention. As shown in the figure, the mobile communication system of this embodiment includes: a serving gateway 10, a base station 1 1 , a base station 12, a calling party (user equipment) 15, and a called party. Party (User Equipment) 16. The specific scenario is as follows: The base station 11 and the base station 12 both access the serving gateway 10, the calling party 16 accesses the base station 12, the called party 15 accesses the base station 11, and the calling party 16 initiates a communication connection to the called party 15. The method flow in this embodiment is described in detail below.

In step S101, non-access stratum signaling message transmission is performed between the serving gateway 10, the base station 12, and the calling party 16.

In step S102, the serving gateway 10 acquires the information of the called party 15 from the base station 12 and the calling party 16.

In step S103, the serving gateway 10 pages to the called party 15.

In step S104, the called party 15 and the base station 11 enter a random access procedure. In step S105, radio resource control is established between the called party 15 and the base station 11.

(Radio Resource Control, RRC) layer connection. The method includes: the called party 15 sends a RRC connection request message to the base station 11; the base station 11 sends a RRC connection establishment message to the called party 15; the called party 15 sends the RRC connection establishment to the base station 11 Message.

In step S106, the base station 11 transmits initial user information to the serving gateway 10. Those skilled in the art should understand that after step S106, the serving gateway 10 acquires the information of the called party 15 and the base station 11 to which it is accessed. Alternatively, the serving gateway 10 will be at the calling party 16 and the called party 15 This information is saved during this communication.

In step S107, the serving gateway 10, the base station 11, and the called party 15 perform non-access stratum signaling message transmission.

In step S108, the serving gateway 10 transmits an initial context setup request message to the base station 11.

In step S109, the called party 15 and the base station 11 perform radio resource control layer connection reconfiguration. The method includes: the base station 11 sends a RRC connection reconfiguration message to the called party 15; the called party 15 sends a RRC connection reconfiguration completion message to the base station 11.

In step S110, the non-access stratum signaling message transmission is performed between the serving gateway 10, the base station 11, and the called party 15.

In step S111, the base station 11 transmits an initial context setup response message to the serving gateway 10. Optionally, the foregoing steps S101 to S111 may be consistent with the existing LTE protocol specifications to improve compatibility of the technical solutions in the present invention.

The following steps are mainly performed by the serving gateway 10, the base station 11 accessed by the called party 15, and the base station 12 accessed by the calling party 16, respectively, to implement local exchange of communication between the calling party 16 and the called party 15. .

In step S112, the serving gateway 10 determines whether the base station 12 to which the calling party 16 is connected and the base station 11 to which the called party 15 is connected access the serving gateway 10; if yes, in step S113, the serving gateway The message that carries the local exchange information is sent to the base station 11 that is accessed by the called party 15; wherein, the local exchange information includes: the calling party identifier, the enhanced wireless access bearer corresponding to the calling party and the called party. Identification (E-RAB ID).

Generally, base stations accessing the same serving gateway are neighbors to each other on the network topology, even in actual distribution, so that there is a possibility of establishing an X2-interface based connection between the base stations to communicate with each other. Therefore, when the serving gateway 10 determines that both the base station 11 and the base station 12 access the serving gateway 10, the above message carrying the local exchange information may be sent to attempt to establish an X2-interface based connection between the base station 11 and the base station 12 for carrying Communication between the calling party 16 and the called party 15. If the calling party and the called party access the same base station, the base station can directly exchange each other's data. If the calling party and the called party access different base stations, the message carrying the local exchange information sent by the serving gateway 10 further includes: an identifier of the base station to which the calling party accesses. If the base station 11 and the base station 12 do not both access the serving gateway 10, the solution in the prior art can still be employed, and the serving gateway 10 exchanges data between the calling party 16 and the called party 15 as an intermediate node.

Specifically, in an embodiment of the present invention, the message carrying the local exchange information is implemented by a modified enhanced radio access bearer setup request (E-RAB SETUP REQUEST) message, and the specific content is defined as follows:

> Global eNB ID O

> eNB UE SIAP ID M

E-RAB to be Setup List M

>E-RAB To Be Setup Item IEs

» E-RAB ID M

» E-RAB Level QoS Parameters M

» Transport Layer Address M

» GTP-TEID M

»NAS-PDU M

»Local Switching E-RAB Info 0

»> E-RAB ID M

The Local Switching UE Info and the Local Switching E-RAB Info are newly added fields. The Global eNB ID indicates the identity of the base station to which the calling party accesses, and the eNB UE SIAP ID indicates that the calling party is on the Global eNB ID. The E-RAB ID represents the enhanced radio access bearer of the calling party that can be locally exchanged with the enhanced wireless access bearer of the called party. The remaining fields can be consistent with existing LTE protocol specifications to improve the compatibility of the message.

In step S113, the base station 11 accessed by the called party 15 will receive a message carrying the local exchange information from the serving gateway 10; the local exchange information includes: a calling party identifier, a calling party, and a called party. Enhanced wireless access to the logo. As mentioned above, the message carrying the local exchange information may also include: the identifier of the base station to which the calling party is connected.

In step S114, the base station 11 will determine whether there is an available X2 interface based connection between itself (base station 1 1 ) and the base station 12 to which the calling party 16 is connected based on the local exchange information.

If there is an available X2 interface based connection between the base station 11 and the base station 12, then the following steps are performed.

In step S115, the RRC connection reconfiguration is performed between the called party 15 and the base station 11, and the method includes: the base station 1 1 sends a RRC Connection Reconfiguration (RRC Connection Reconfiguration) message to the called party 15, and then By the called party 15 A RRC Connection Reconfiguration Complete message is transmitted to the base station 11. Alternatively, the two messages may be consistent with existing LTE protocol specifications to improve the compatibility of the schemes of the present invention.

In step S1151, the base station 11 will initiate an X2 based interface connection with the base station 12 to which the calling party 16 is connected.

Specifically, in an embodiment of the present invention, step S1 151 is implemented by the base station 11 sending a local switch setup request (X2AP: Local Switching SETUP REQ) message to the base station 12 through the X2 interface, and the specific content of the message is defined as shown in the following table. :

The eNB UE X2AP ID represents the X2 application protocol identifier of the called party; the Local Switching eNB UE S1AP ID indicates the SI identity of the calling party in the base station to which the calling party accesses; E-RAB to be Local Switching List indicates the called party An enhanced radio access bearer for the local data exchange through the X2 interface; the E-RAB ID represents an enhanced radio access bearer associated with the called party that can be locally exchanged with the enhanced radio access bearer of the calling party; The GTP Tunnel Endpoint indicates the GTP (GPRS Tunneling Protocol) endpoint of the X2 transport bearer, and is used to transmit the locally exchanged Protocol Data Unit (PDU); the Local Switching E-RAB ID indicates the identity of the enhanced enhanced radio access bearer of the calling party.

After receiving the X2 interface-based connection establishment request for local exchange from the base station 11 to which the called party 15 is connected, in step S1152, the base station 12 to which the calling party 16 accesses will transmit to the base station 11 based on Connection establishment for local exchange on the X2 interface

^P response Specifically, in an embodiment of the present invention, step S1 152 is passed by the base station 12.

The X2 interface sends a Local Switching SETUP (SP2) message to the base station 11, and the specific content of the message is defined as follows:

The eNB UE X2AP ID represents the X2 application protocol identifier of the calling party; the Requiring eNB UE X2AP ID represents the X2 application protocol identifier of the called party; and the E-RAB successfully to be Local Switching List indicates that the X2 connection and the called party are successfully connected. Related enhanced radio access bearers of the calling party that enhances the radio access bearer for local data exchange; the E-RAB ID represents the calling party that can be locally exchanged with the called party's enhanced radio access bearer The GTP Tunnel Endpoint represents the GTP endpoint of the X2 transport bearer; the E-RAB failed to be Local Switching List indicates that the enhanced radio access bearer associated with the called party through the X2 connection fails to perform local data exchange. The party's related enhanced wireless access bearer.

Optionally, in some embodiments of the present invention, the method further includes a step S116, the base station 11 accessed by the called party 15 sends a message to the serving gateway 10, where the message carries whether the connection based on the X2 interface is established. A successful indication that the connection is used to carry communication between the calling party 16 and the called party 15. The message may be implemented by a modified E-RAB SETUP RESPONSE message; specifically, an optional field may be added to the existing enhanced radio access bearer setup response message. Local Switching Setup Success Flag; if this field does not exist in all Enhanced Radio Access Bearer Setup Items (E-RAB Setup Item), this means The base station does not support the local switching function; if the value of this field is false, it means that the base station fails to establish a local switched data path for the associated enhanced radio access bearer; if the value of this field is true, it means that the base station is successfully related The enhanced radio access bearer establishes a local switched data path.

Next, if the above-mentioned X2 interface-based connection for carrying the communication between the calling party 16 and the called party 15 is successfully established, the base station 11 and the base station 12 mutually transmit the called party 15 and the calling party through the connection. Data for communication between 16.

Optionally, in the above process, the serving gateway 10 retains user plane information of the associated enhanced radio access bearers assigned to the calling party 16 and the called party 15 even if the base station indicates that the local switched data path is successfully established. For the serving gateway 10, the data path between the calling party 16 and the serving gateway 10 and the data path between the called party 15 and the monthly gateway 10 are still valid. The base station then reserves the user plane information of the serving gateway for the calling party 16 and the called party 15 respectively. Therefore, during the communication between the calling party 16 and the called party 15, the local switched data path based on the X2 interface can be suspended at any time, and the data path based on the S1 interface exchanged through the serving gateway 10 is used instead.

When a handover occurs between one of the user equipment 15 and the user equipment 16, the local switched data path based on the X2 interface may be affected.

When a handoff within a base station occurs, the original X2 interface-based local switched data path can remain unchanged.

When a cross-base handover occurs, the original X2 interface-based local switched data path will be terminated.

2 shows a flow chart of a method of implementing handover in a mobile communication network in accordance with one embodiment of the present invention. As shown in the figure, the mobile communication system of this embodiment includes: a serving gateway 20, a base station 21, a base station 22, a base station 23, a user equipment 25, and a user equipment 26. The specific scenario is as follows: The base stations 21, 22, and 23 are all connected to the serving gateway 20. The first user equipment 25 and the second user equipment 26 are communicating with each other, and the second user equipment 26 is connected to the base station 21 and the first user equipment 25 is accessed. It is preparing to switch from base station 22 to base station 23. The method flow in this embodiment will be described in detail below.

In step S201, the user equipment 25 transmits a measurement report to the base station 22.

Based on the measurement report and instructions from the core network (eg, to the service gateway 20), The base station 22 is aware that the base station 23 will take over itself (the base station 22) to provide the access service of the user equipment 25.

In step S202, the base station 22 to which the first user equipment 25 is connected will send a handover request to the base station 23 regarding the communication between the user equipment 25 and the user equipment 26.

Specifically, in an embodiment of the present invention, step S202 is implemented by the base station 22 transmitting a handover request message based on the S1 interface to the service gateway 20. The serving gateway 20 will forward the handover request to the base station 23.

Specifically, in another embodiment of the present invention, there is an X2 interface connection between the base station 22 and the base station 23, and the base station 22 accessed by the first user equipment 25 sends a modified handover to the base station 23 through the X2 interface. Request (X2AP:

HANDOVER REQUEST ) The message is implemented. The specific content of the message is defined as follows:

»> DL Forwarding O

»> UL GTP Tunnel Endpoint M

»> Local Switching E-RAB ID O

> RRC Context M

>Handover Restriction List 0

>Location Reporting Information o

UE History Information M

Trace Activation 0

SRVCC Operation Possible 0

The Global eNB ID indicates the identity of the base station to which the communicating party is connected, that is, the base station 21 to which the second user equipment 26 accesses; the eNB UE X2AP ID indicates the counterpart of the communication, that is, the second user equipment 26 is in the above Global The X2 application protocol identifier on the eNB ID; the Local Switching E-RAB ID indicates the enhanced wireless connection of the other party (the second user equipment 26) that can be locally exchanged with the enhanced radio access bearer of the own party (the first user equipment 25) Incoming bearers; all three fields are new. The remaining fields can be consistent with existing LTE protocol specifications to improve the compatibility of the message.

In step S203, the base station 23 will receive a message with a handover request regarding communication between the first user equipment 25 and the second user equipment 26. As described above, in different embodiments of the present invention, the handover request message may be based on an X2 interface or based on an S1 interface.

In step S204, the base station 23 will determine if there is an available X2 interface based connection between itself and the base station 21 to which the second user equipment 26 is connected. Optionally, the base station 23 will also allocate a number of GTP endpoint resources: one of which is based on the X2 interface for the base station 22 to forward data; the other is for a conventional data exchange path based on the S1 interface; wherein the other is based on the X2 interface Used for local exchange of data paths between the base station 21 and the base station 23.

If there is an available X2 interface based connection between the base station 23 and the base station 22, then the following steps are performed.

In step S205, the base station 23 initiates an X2-based interface connection with the base station 21 to which the second user equipment 26 is connected, and the connection is used to carry the first user equipment. Communication with the second user device 26 is 25.

Specifically, step S205 is implemented by the base station 23 sending a local switched handover request (X2AP: Local Switching HO REQ) message to the base station 21 through the X2 interface, and the specific content of the message is defined as follows:

The eNB UE X2AP ID indicates the X2 application protocol identifier of the first user equipment 25; the Local Switching eNB UE X2AP ID indicates the X2 application protocol identifier of the first user equipment 26 in the base station 21 to which the user equipment 26 is accessed, and the field may be Local. The Switching eNB UE S IAP ID field is substituted, depending on whether the handover request message in step S202 is based on an X2 interface or an S1 interface; the E-RAB to be Local Switching List indicates that the first user equipment 25 wishes to exchange local data through the X2 interface. The associated enhanced radio access bearer; the E-RAB ID represents an enhanced radio access bearer associated with the first user equipment 25 that can be locally exchanged with the enhanced radio access bearer of the second user equipment 26; the GTP Tunnel Endpoint represents X2 The GTP endpoint of the transport bearer is used to transmit the locally exchanged protocol data unit; the Local Switching E-RAB ID represents the identity of the associated enhanced radio access bearer of the second user equipment 26.

In step S206, the base station 21 accessed by the second user equipment 26 stops transmitting data of the second user equipment 26 to the first user equipment 25 to the base station 22, and allocates an X2 interface based between the base station 21 and the base station 23. Resources are used for local exchange.

In step S207, the base station 21 connects the establishment initiated in response to the base station 23 based on the X2 interface. Specifically, step S207 is implemented by the base station 21 sending a local switched handover response (X2AP: Local Switching HO RSP) message to the base station 23 through the X2 interface, and the specific content of the message is defined as follows:

The eNB UE X2AP ID represents the X2 application protocol identifier of the second user equipment 26; the Requiring eNB UE X2AP ID represents the X2 application protocol identifier of the first user equipment 25; and the E-RAB successfully to be Local Switching List indicates that the connection is successfully performed through the X2 An enhanced radio access bearer of the second user equipment 26 for enhancing local access to the enhanced radio access bearer associated with the first user equipment 25; the E-RAB ID indicating an enhanced radio access bearer that can be associated with the first user equipment 25 The related enhanced radio access bearer of the second user equipment 26 that performs local exchange; the GTP Tunnel Endpoint represents the GTP endpoint of the X2 transport bearer; and the E-RAB failed to be Local Switching List indicates that the first user equipment 25 is connected through the X2 connection. The enhanced enhanced radio access bearer of the second user equipment 26 that enhances the radio access bearer for local data exchange.

It should be understood by those skilled in the art that if the handover request message in step S202 is based on the S1 interface, the local exchange handover request message in step S205 and the local exchange handover response message in step S207 may be respectively in content with the foregoing embodiment. The local exchange establishment request message in step S1151 and the local interaction establishment response message in step S1152 are consistent.

In step S208, the base station 21 to which the second user equipment 26 is connected will transmit data (of the second user equipment 26 to the first user equipment 25) to the base station 23. In step S209, the base station 23 transmits a handover request acknowledgement (HANDOVER REQUEST ACKNOWLEDGE) message to the base station 22.

Specifically, in an embodiment of the present invention, the handover request message in step S202 is based on the S1 interface; and accordingly, in step S209, the base station 23 sends a handover request acknowledgement message based on the S1 interface to the service gateway 20. The serving gateway 20 will forward the handover request acknowledgement to the base station 22.

Specifically, in another embodiment of the present invention, the handover request message in step S202 is based on the X2 interface; and correspondingly, in step S209, the base station 23 sends an X2 interface-based handover request acknowledgement message to the base station 22, The specific content of the message is defined as the following table:

The Local Switching Setup Success Flag is a new optional field used as an indication of whether the X2 interface-based connection between the base station 23 and the base station 21 accessed by the second user equipment 26 is successfully established; This field does not exist in the Enhanced Radio Access Bearer Item (E-RAB Admitted Item), which means that the base station does not support the local switching function. If the value of this field is false, it means that the base station has The enhanced enhanced radio access bearer fails to establish a local switched data path; if the value of this field is true, it means that the base station successfully establishes a local switched data path for the associated enhanced radio access bearer. The remaining fields can be consistent with existing LTE protocol specifications to improve the compatibility of the message.

After receiving the handover confirmation request message from the base station 23, the base station 21 will stop transmitting the data of the first user equipment 25 to the second user equipment 26 in step S210.

In step S21 1, the first user equipment 25 and the base station 22 and the base station 23 accessed by the user equipment 25 will perform radio resource control layer connection reconfiguration and data forwarding. The base station 22 sends a radio resource control layer connection reconfiguration (RRC Connection Reconfiguration) message to the first user equipment 25; the base station 22 sends an X2 interface based serial number status transmission (SN Status Transfer) message to the base station 23; The base station 23 forwards the data buffered by the handover operation; the first user equipment 25 transmits a radio resource control layer connection reconfiguration complete (RRC Connection Reconfiguration Complete) message to the base station 23.

In step S212, the base station 23 will send a path exchange request to the serving gateway 20.

( PATH SWITCH REQUEST ) message. Those skilled in the art will appreciate that the message is based on the S1 interface.

So far, the access service of the first user equipment 25 is switched from the base station 22 to the base station 23, and the data communication between the first user equipment 25 and the second user equipment 26 is through the X2 interface based connection between the base station 21 and the base station 23. Local exchange can still be implemented.

3 shows a flow chart of a method of implementing handover in a mobile communication network in accordance with one embodiment of the present invention. As shown in the figure, the mobile communication system of this embodiment includes: a serving gateway 30, a base station 31, a base station 32, a base station 33, a user equipment 35, and a user equipment 36. The specific scenario is as follows: The base stations 31, 32, and 33 are all connected to the serving gateway 30, and the first user equipment 35 and the second user equipment 36 are communicating with each other through the X2 interface between the base station 31 and the base station 32, and the second user equipment 36 is connected. Into the base station 31, the access of the first user equipment 35 is preparing to switch from the base station 32 to the base station 33, and there is no X2 interface based connection between the base station 31 and the base station 33. The method flow in this embodiment is described in detail below.

In step S301, the base station 32 receives the measurement report from the first user equipment 35, and determines that the base station 33 takes over itself (the base station 32) to provide the access device of the user equipment 35. Business.

In step S302, the base station 32 transmits a handover request message regarding communication between the user equipment 35 and the user equipment 36 to the base station 33.

In step S303, the base station 33 transmits a handover request acknowledgement message to the base station 32. When there is an X2 interface based connection between the base station 32 and the base station 33, the handover request message and the handover request acknowledgement message may be based on the X2 interface.

In step S304, the base station 32 will stop transmitting the data of the first user equipment 35 to the second user equipment 36 to the base station 31, and buffer the data based on the X2 interface, ready to receive data from the serving gateway 30.

In step S305, the base station 32 will transmit a radio resource control layer connection reconfiguration message to the first user equipment 35.

In step S306, the base station 32 will send an X2 interface based Local Switching HO Indication message to the base station 31.

In step S307, the base station 31 will stop transmitting the data of the second user equipment 36 to the first user equipment 35 to the base station 32, and then transmit such data to the serving gateway 30. At the same time, the base station 31 will also transmit to the base station 32 GDP data carrying an end marker (End Marker) for indicating to the base station 32 the last data packet transmitted via the X2 interface based connection. When the base station 32 receives the cutoff flag, it means that the data from the base station 31 is no longer received from the connection based on the X2 interface.

In step S308, the base station 32 terminates the buffering based on the receipt of the cutoff flag.

The data of the X2 interface.

Thereafter, data from the second user equipment 36 to the first user equipment 35 will be forwarded to the base station 32 via the service gateway 30.

In step S309, the base station 32 receives the data from the serving gateway 30 and buffers the data.

In step S310, the base station 32 will transmit a sequence number status transmission (SN Status Transfer) message based on the X2 interface to the base station 33. At the same time, the base station 32 will forward the buffered data (of the second user equipment 36 to the first user equipment 35) to the base station 33.

In step S31 1, the first user equipment 35 will transmit a RRC Connection Reconfiguration Complete (RRC Connection Reconfiguration Complete) message to the base station 33. In step S312, the base station 33 will send a Path Switch Request (PATH SWITCH REQUEST) message to the Serving Gateway 30. Those skilled in the art will appreciate that the message is based on the S1 interface.

So far, the access service of the first user equipment 35 is switched from the base station 32 to the base station 33, and the data communication between the first user equipment 35 and the second user equipment 36 is implemented through the service gateway 30 and the connection based on the traditional S1 interface. exchange.

In the above process, only the local exchange switching indication message in step S306 is added to the X2 interface.

4 is a block diagram showing the structure of a first switching device that implements local switching in a base station according to an embodiment of the present invention. As shown, the first switching device 100 includes: a first receiving device 101, a first determining device 102, and a first processing device 103. The first switching device 100 is typically disposed in the base station 1 1 to which the called party 15 is connected in the embodiment shown in FIG.

The first receiving device 101 is configured to receive a message carrying the local exchange information from the serving gateway, where the local exchange information includes: a calling party identifier, an identifier of the enhanced radio access bearer corresponding to the calling party and the called party.

The first determining means 102 is configured to determine, based on the local exchange information, whether there is an available X2-interface based connection between the base station and a base station to which the calling party is connected.

The first processing device 103 is configured to initiate establishment of a connection with the base station to which the calling party is connected if there is an available X2 interface-based connection between the base station and the base station accessed by the calling party. Connection based on the X2 interface.

In conjunction with the embodiment shown in FIG. 1, the first receiving device 101 is configured to complete step S113, and the first determining device 102 is configured to perform step S1 14. The first processing device 103 is configured to perform step S1 151.

Figure 5 is a block diagram showing the structure of a second switching device that implements local switching in a base station in accordance with one embodiment of the present invention. As shown, the second switching device 200 includes: a second receiving device 201, and a first responding device 202. The second switching device 200 is typically disposed in the base station 12 to which the calling party 16 is connected in the embodiment of FIG.

The second receiving device 201 is configured to receive a base station based on the base station accessed by the called party A connection establishment request for local exchange on the X2 interface.

The first responding device 202 is configured to send a connection establishment response for the local exchange based on the X2 interface to the base station accessed by the called party.

In conjunction with the embodiment shown in FIG. 1, the second receiving device 201 is configured to complete step S1 151, and the first responding device 202 is configured to perform step S1152.

Figure 6 is a block diagram showing the structure of a third switching device that implements local switching in a serving gateway, in accordance with one embodiment of the present invention. As shown, the third switching device 300 includes a second processing device 301. The third switching device 300 is typically disposed in the Serving Gateway 10 in the embodiment of Figure 1.

The second processing device 301 is configured to: determine whether the base station accessed by the calling party and the base station accessed by the called party access the serving gateway, and if yes, send to the base station accessed by the called party The message carrying the local exchange information includes: the identity of the calling party, the identity of the enhanced wireless access corresponding to the calling party and the called party.

In conjunction with the embodiment of Figure 1, the third switching device 300 is operative to perform steps S1 12 and S113.

FIG. 7 is a block diagram showing the structure of a first switching device that implements handover in a base station according to an embodiment of the present invention. As shown, the first switching device 400 includes: a third receiving device 401, a second determining device 402, and a third processing device 403. The first change device 400 is typically disposed in the base station 23 in the embodiment shown in FIG.

The third receiving device 401 is configured to receive a handover request regarding communication between the first user equipment and the second user equipment.

The second determining means 402 is configured to determine whether there is an available X2 interface based connection between the base station and the base station to which the second user equipment is connected.

The third processing device 403 is configured to: if there is an available X2 interface-based connection between the base station and the base station accessed by the second user equipment, initiate establishment of a base station connected to the second user equipment An X2 interface based connection between the first user equipment and the second user equipment.

In conjunction with the embodiment shown in FIG. 2, the third receiving device 401 is configured to implement step S203, the second determining device 402 is configured to perform step S204, and the third processing device 403 is configured to perform step S205. FIG. 8 is a block diagram showing the structure of a second switching device that implements handover in a base station according to an embodiment of the present invention. As shown, the second switching device 500 includes: a first transmitting device 501, a fourth receiving device 502, and a fourth processing device 503. The second switching device 500 is typically disposed in the base station 22 to which the first user equipment 25 is connected in the embodiment shown in FIG.

The first transmitting device 501 is configured to send, to another base station, a handover request regarding communication between the first user equipment and the second user equipment.

The fourth receiving device 502 is configured to receive a handover request acknowledgement from the another base station.

The fourth processing device 503 is configured to stop sending data of the first user equipment to the second user equipment.

In conjunction with the embodiment shown in FIG. 2, the first transmitting device 501 is configured to perform step S202, the fourth receiving device 502 is configured to complete step S209, and the fourth processing device 503 is configured to perform step S210.

The device referred to in the present invention may be implemented by a software function module, may also be implemented by a hardware module, or may be implemented by a combination of hardware and software.

Those skilled in the art will appreciate that the above-described embodiments are illustrative and not limiting. Other variations of the disclosed embodiments can be understood and effected by those skilled in the <RTIgt; In the claims, the word "comprising" does not exclude other means or steps. The indefinite article "a" does not exclude a plurality. order of. Any reference signs in the claims should not be construed as limiting the scope of the invention. The functions of the various parts appearing in the claims can be implemented by a single hardware or software module. The mere fact that certain technical features are present in different sub-claims does not mean that these technical features are not combined to achieve a beneficial effect.

Claims

Claim

A method for implementing local switching in a base station, wherein a called party accesses the base station, the method comprising the steps of:

Receiving a message carrying local exchange information from the serving gateway; the local exchange information includes: a calling party identifier, an identifier of the enhanced wireless access bearer corresponding to the calling party and the called party;

Determining, based on the local exchange information, whether an available X2 interface-based connection exists between the base station and a base station accessed by the calling party;

If there is an available X2 interface-based connection between the base station and the base station to which the calling party accesses, initiate an X2 interface-based connection with the base station to which the calling party is connected.

The method according to claim 1, further comprising the steps of: if the X2 interface-based connection is successfully established, sending the called party to the calling party by using the X2 interface-based connection The data.

The method according to claim 1 or 2, further comprising the step of: sending a message to the serving gateway, the message carrying an indication of whether the connection based on the X2 interface is successfully established.

A method of implementing local switching in a base station, wherein a calling party accesses the base station, the method comprising the steps of:

Receiving a connection establishment request for local exchange based on an X2 interface from a base station to which the called party is connected;

A connection establishment response for local exchange based on the X2 interface is sent to the base station to which the called party is connected.

A method for implementing local exchange in a serving gateway, comprising the steps of: determining whether a base station accessed by a calling party and a base station accessed by the called party access the service gateway, and if so, The base station accessed by the called party sends a message carrying the local exchange information. The local exchange information includes: a calling party identifier, an identifier of the enhanced radio access bearer corresponding to the calling party and the called party.

6. A method of implementing handover in a base station, comprising the steps of: Receiving a handover request regarding communication between the first user equipment and the second user equipment;

Determining whether there is an available X2 interface-based connection between the base station and the base station to which the second user equipment is connected;

If there is an available X2 interface-based connection between the base station and the base station to which the second user equipment is connected, initiate an X2 interface-based connection with the base station to which the second user equipment is connected. The connection is used to carry communication between the first user equipment and the second user equipment.

The method according to claim 6, further comprising the steps of: transmitting the first user equipment to the second by using the X2 interface based connection if the connection based on the X2 interface is successfully established User device data.

8. Method according to claim 6 or 7, characterized in that

The switching request is based on an X2 interface or an S1 interface;

The method also includes the steps of:

And transmitting, to the base station to which the first user equipment is connected, a handover request acknowledgement, the handover request acknowledgement carrying an indication that the connection based on the X2 interface is successfully established.

A method for implementing handover in a base station, where a first user equipment accesses the base station, the method comprising the following steps:

Transmitting, to another base station, a handover request regarding communication between the first user equipment and the second user equipment;

Receiving a handover request acknowledgement from the another base station;

Stop sending data of the first user equipment to the second user equipment.

10. The method according to claim 9, wherein the handover request acknowledgement carries whether an X2 interface based connection between the another base station and a base station to which the second user equipment is connected is established. Instructions for success.

A first switching device that implements local switching in a base station, wherein the called party accesses the base station, and the first switching device includes:

a first receiving device, configured to receive a message carrying local exchange information from the serving gateway; the local exchange information includes: a calling party identifier, an enhanced wireless access bearer identifier corresponding to the calling party and the called party ; a first determining means, configured to determine, according to the local exchange information, whether there is an available X2 interface-based connection between the base station and a base station accessed by the calling party; An X2 interface-based connection between the base station and the base station accessed by the calling party is initiated, and an X2 interface-based connection between the base station and the base station accessed by the calling party is initiated.

12. A second switching device that implements local switching in a base station, wherein a calling party accesses the base station, the second switching device comprising:

a second receiving device, configured to receive an X2 interface based connection establishment request for local exchange from a base station accessed by the called party;

And a first responding device, configured to send, according to the X2 interface, a connection establishment response for local exchange to the base station accessed by the called party.

A third switching device that implements local switching in a serving gateway, comprising: a second processing device, configured to: determine whether a base station accessed by a calling party and a base station accessed by the called party are both accessed The serving gateway, if yes, sending a message carrying local exchange information to the base station accessed by the called party; the local exchange information includes: a calling party identifier, an enhanced call corresponding to the calling party and the called party The identifier of the wireless access.

14. A first switching device for implementing handover in a base station, comprising:

a third receiving device, configured to receive a handover request regarding communication between the first user equipment and the second user equipment;

a second determining means, configured to determine whether an available X2 interface-based connection exists between the base station and the base station to which the second user equipment is connected;

And a third processing device, configured to: if there is an available X2 interface-based connection between the base station and the base station accessed by the second user equipment, initiate establishment of a base station that is connected to the second user equipment An X2 interface based connection between the first user equipment and the second user equipment.

A second switching device that implements handover in a base station, where a first user equipment accesses the base station, and the second switching device includes:

a first sending device, configured to send, to another base station, a handover request regarding communication between the first user equipment and the second user equipment;

a fourth receiving device, configured to receive a handover request acknowledgement from the another base station; And a fourth processing device, configured to stop sending data of the first user equipment to the second user equipment.