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WO2011113210A1 - 多基站间本地交换的方法及装置 - Google Patents

多基站间本地交换的方法及装置 Download PDF

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Publication number
WO2011113210A1
WO2011113210A1 PCT/CN2010/071163 CN2010071163W WO2011113210A1 WO 2011113210 A1 WO2011113210 A1 WO 2011113210A1 CN 2010071163 W CN2010071163 W CN 2010071163W WO 2011113210 A1 WO2011113210 A1 WO 2011113210A1
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WO
WIPO (PCT)
Prior art keywords
base station
user equipment
interface
calling party
called party
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2010/071163
Other languages
English (en)
French (fr)
Inventor
钱荣福
徐浩
孔令山
吕平宝
韦宇
汪云华
马红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Shanghai Bell Co Ltd
Alcatel Lucent SAS
Original Assignee
Alcatel Lucent Shanghai Bell Co Ltd
Alcatel Lucent SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Lucent Shanghai Bell Co Ltd, Alcatel Lucent SAS filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to PCT/CN2010/071163 priority Critical patent/WO2011113210A1/zh
Priority to CN201080059706.5A priority patent/CN102687558B/zh
Publication of WO2011113210A1 publication Critical patent/WO2011113210A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/16Interfaces between hierarchically similar devices
    • H04W92/20Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to wireless communication technologies, and more particularly to a method and apparatus for local exchange of base stations. Background technique
  • LTE Long Term Evolution
  • SGW Serving Gateway
  • GSM Global System for Mobile Communications
  • BSC base station controller
  • the present invention proposes a method and apparatus for realizing local exchange between multiple base stations by using an X2 interface.
  • a method for implementing local switching in a base station, wherein a called party accesses the base station 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.
  • a method for implementing local switching in a base station 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.
  • a method for implementing local switching in a serving gateway 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.
  • a method for implementing handover in a base station 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 ⁇ 2 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.
  • a method for implementing handover in a base station 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.
  • a first switching device that implements local switching in a base station
  • 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.
  • a second switching device for implementing local switching in a base station
  • 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.
  • a first switching apparatus for implementing handover in a base station 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.
  • a second switching apparatus that implements handover in a base station
  • 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.
  • 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
  • FIG. 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
  • FIG. 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
  • FIG. 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
  • FIG. 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
  • 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.
  • step S101 non-access stratum signaling message transmission is performed between the serving gateway 10, the base station 12, and the calling party 16.
  • step S102 the serving gateway 10 acquires the information of the called party 15 from the base station 12 and the calling party 16.
  • step S103 the serving gateway 10 pages to the called party 15.
  • step S104 the called party 15 and the base station 11 enter a random access procedure.
  • step S105 radio resource control is established between the called party 15 and the base station 11.
  • 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.
  • RRC Radio Resource Control
  • step S106 the base station 11 transmits initial user information to the serving gateway 10.
  • 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.
  • step S107 the serving gateway 10, the base station 11, and the called party 15 perform non-access stratum signaling message transmission.
  • step S108 the serving gateway 10 transmits an initial context setup request message to the base station 11.
  • 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.
  • 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.
  • step S111 the base station 11 transmits an initial context setup response message to the serving gateway 10.
  • 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. .
  • 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).
  • 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.
  • 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.
  • 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:
  • 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.
  • 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.
  • the message carrying the local exchange information may also include: the identifier of the base station to which the calling party is connected.
  • 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.
  • 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.
  • RRC Connection Reconfiguration RRC Connection Reconfiguration
  • the two messages may be consistent with existing LTE protocol specifications to improve the compatibility of the schemes of the present invention.
  • 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.
  • 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. :
  • X2AP Local Switching SETUP REQ
  • 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.
  • step S1152 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
  • 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 is 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
  • 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.
  • 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.
  • E-RAB Setup Item Enhanced Radio Access Bearer Setup Items
  • 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.
  • 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.
  • 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 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.
  • the local switched data path based on the X2 interface may be affected.
  • the original X2 interface-based local switched data path can remain unchanged.
  • 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.
  • step S201 the user equipment 25 transmits a measurement report to the base station 22.
  • 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.
  • 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.
  • 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.
  • X2AP 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.
  • 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.
  • 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.
  • the handover request message may be based on an X2 interface or based on an S1 interface.
  • 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.
  • 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.
  • 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.
  • 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:
  • X2AP Local Switching HO REQ
  • 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 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.
  • 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.
  • 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:
  • X2AP Local Switching HO RSP
  • 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
  • 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 local exchange handover request message in step S205 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.
  • 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.
  • step S209 the base station 23 transmits a handover request acknowledgement (HANDOVER REQUEST ACKNOWLEDGE) message to the base station 22.
  • HANDOVER REQUEST ACKNOWLEDGE handover request acknowledgement
  • 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.
  • 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.
  • the base station 21 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.
  • 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.
  • RRC Connection Reconfiguration radio resource control layer connection reconfiguration
  • step S212 the base station 23 will send a path exchange request to the serving gateway 20.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • step S303 the base station 33 transmits a handover request acknowledgement message to the base station 32.
  • the handover request message and the handover request acknowledgement message may be based on the X2 interface.
  • 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.
  • step S305 the base station 32 will transmit a radio resource control layer connection reconfiguration message to the first user equipment 35.
  • step S306 the base station 32 will send an X2 interface based Local Switching HO Indication message to the base station 31.
  • 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.
  • End Marker End Marker
  • step S308 the base station 32 terminates the buffering based on the receipt of the cutoff flag.
  • step S309 the base station 32 receives the data from the serving gateway 30 and buffers the data.
  • 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.
  • SN Status Transfer sequence number status transmission
  • step S31 the first user equipment 35 will transmit a RRC Connection Reconfiguration Complete (RRC Connection Reconfiguration Complete) message to the base station 33.
  • step S312 the base station 33 will send a Path Switch Request (PATH SWITCH REQUEST) message to the Serving Gateway 30.
  • PATH SWITCH REQUEST Path Switch Request
  • 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.
  • step S306 only the local exchange switching indication message in step S306 is added to the X2 interface.
  • 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.
  • 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.
  • FIG. 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.
  • 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.
  • the second receiving device 201 is configured to complete step S1 151, and the first responding device 202 is configured to perform step S1152.
  • FIG. 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the first transmitting device 501 is configured to perform step S202
  • the fourth receiving device 502 is configured to complete step S209
  • 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.

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Description

多基站间本地交换的方法及装置 技术领域
本发明涉及无线通信技术, 尤其涉及基站本地交换的方法及装 置。 背景技术
在当前的长期演进(Long Term Evolution, LTE ) 网络中, 在某 一服务建立成功之后, 该服务的数据路径将通过服务网关 (Serving Gateway, SGW ) 节点。
对于全球移动通信系统 (GSM ) 网络的一些研究显示, 一个基 站控制器 (BSC ) 所处理的所有呼叫中, 平均有 30%甚至更多的呼 叫为本地呼叫。 可以想见, LTE网络中的情形类似于 GSM网络中的 情形。 在一些人口稠密区和农村偏远区域, 大多数呼叫 (主叫以及 被叫)发生在同一个基站或者一组基站之中。根据现有的 LTE协议, 两个用户的数据必须由服务网关节点来交换, 哪怕这两个用户面对 着面。 因此, 本地呼叫占用了大量回程(backhaul )链路的资源, 并 且也使得本地呼叫需要承担高 的网络传输费用。 发明内容
为了克服现有技术中的上述缺陷,本发明提出了一种利用 X2接 口来实现多基站间本地交换的方法及装置。
根据本发明的一个方面, 提供了一种在基站中实现本地交换的 方法, 其中被叫方接入所述基站, 所述方法包括以下步骤: 接收来 自服务网关的携带本地交换信息的消息, 所述本地交换信息包括: 主叫方标识、 主叫方和被叫方所对应的增强的无线接入 7|载的标识; 基于所述本地交换信息, 确定所述基站与所述主叫方所接入的基站 之间是否存在可用的基于 X2接口的连接;如果所述基站与所述主叫 方所接入的基站之间存在可用的基于 X2接口的连接 ,则发起建立与 所述主叫方所接入的基站之间的基于 X2接口的连接。 根据本发明的又一个方面, 提供了一种在基站中实现本地交换 的方法, 其中主叫方接入所述基站, 所述方法包括步骤: 接收来自 被叫方所接入的基站的基于 X2 接口的用于本地交换的连接建立请 求;向所述被叫方所接入的基站发送基于 X2接口的用于本地交换的 连接建立响应。
根据本发明的又一个方面, 提供了一种在服务网关中实现本地 交换的方法, 包括以下步骤: 确定主叫方所接入的基站和被叫方所 接入的基站是否均接入所述服务网关, 如果是, 向所述被叫方所接 入的基站发送携带本地交换信息的消息; 所述本地交换信息包括: 主叫方标识、 主叫方和被叫方所对应的增强的无线接入承载的标识。
根据本发明的又一个方面, 提供了一种在基站中实现切换的方 法, 包括以下步骤: 接收有关于第一用户设备与第二用户设备之间 的通信的切换请求; 确定所述基站与所述第二用户设备所接入的基 站之间是否存在可用的基于 X2接口的连接;如果所述基站与所述第 二用户设备所接入的基站之间存在可用的基于 X2接口的连接,则发 起建立与所述第二用户设备所接入的基站之间的基于 χ2 接口的连 接, 该连接用于承载所述第一用户设备与第二用户设备之间的通信。
根据本发明的又一个方面, 提供了一种在基站中实现切换的方 法, 其中第一用户设备接入所述基站, 所述方法包括以下步骤: 向 另一基站发送有关于所述第一用户设备与第二用户设备之间的通信 的切换请求; 接收来自所述另一基站的切换请求确认; 停止发送所 述第一用户设备至所述第二用户设备的数据。
根据本发明的又一个方面, 提供了一种在基站中实现本地交换 的第一交换装置, 其中被叫方接入所述基站, 所述第一交换装置包 括: 第一接收装置, 用于接收来自服务网关的携带本地交换信息的 消息, 所述本地交换信息包括: 主叫方标识、 主叫方和被叫方所对 应的增强的无线接入承载的标识; 第一确定装置, 用于基于所述本 地交换信息, 确定所述基站与所述主叫方所接入的基站之间是否存 在可用的基于 X2接口的连接; 第一处理装置, 用于如果所述基站与 所述主叫方所接入的基站之间存在可用的基于 X2接口的连接,则发 起建立与所述主叫方所接入的基站之间的基于 X2接口的连接。
根据本发明的又一个方面, 提供了一种在基站中实现本地交换 的第二交换装置, 其中主叫方接入所述基站, 所述第二交换装置包 括: 第二接收装置, 用于接收来自被叫方所接入的基站的基于 X2接 口的用于本地交换的连接建立请求; 第一响应装置, 用于向所述被 叫方所接入的基站发送基于 X2 接口的用于本地交换的连接建立响 应。
根据本发明的又一个方面, 提供了一种在服务网关中实现本地 交换的第三交换装置, 包括: 第二处理装置, 用于: 确定主叫方所 接入的基站和被叫方所接入的基站是否均接入所述服务网关, 如果 是, 向所述被叫方所接入的基站发送携带本地交换信息的消息; 所 述本地交换信息包括: 主叫方标识、 主叫方和被叫方所对应的增强 的无线接入承载的标识。
根据本发明的又一个方面, 提供了一种在基站中实现切换的第 一切换装置, 包括: 第三接收装置, 用于接收有关于第一用户设备 与第二用户设备之间的通信的切换请求; 第二确定装置, 用于确定 所述基站与所述第二用户设备所接入的基站之间是否存在可用的基 于 X2接口的连接; 第三处理装置, 用于: 如果所述基站与所述第二 用户设备所接入的基站之间存在可用的基于 X2接口的连接,则发起 建立与所述第二用户设备所接入的基站之间的基于 X2接口的连接, 该连接用于承载所述第一用户设备与第二用户设备之间的通信。
根据本发明的又一个方面, 提供了一种在基站中实现切换的第 二切换装置, 其中第一用户设备接入所述基站, 所述第二切换装置 包括: 第一发送装置, 用于向另一基站发送有关于所述第一用户设 备与第二用户设备之间的通信的切换请求; 第四接收装置, 用于接 收来自所述另一基站的切换请求确认; 第四处理装置, 用于停止发 送所述第一用户设备至所述第二用户设备的数据。
通过使用本发明中的方法及装置, 可以有效地利用基站之间的
X2接口来实现本地数据交换和切换, 总体而言节约了无线通信系统 中的回程链路资源, 减少了数据传送时延, 平均而言降低了用户间 通信的网络传输成本。 附图说明
参考下面的图和说明, 将更好地理解该系统。 图中的元件不一 定按比例绘制, 而是重点用于说明典型模型的原理。 在图中, 贯穿 不同的示图, 类似的参考标号表示对应的特征。
图 1 示出了根据本发明的一个实施例的在移动通信网络中实现 本地交换的方法流程图;
图 2 示出了根据本发明是一个实施例的在移动通信网络中实现 切换的方法流程图;
图 3 示出了根据本发明是一个实施例的在移动通信网络中实现 切换的方法流程图;
图 4 示出了根据本发明的一个实施例的在基站中实现本地交换 的第一交换装置的结构示意图;
图 5 示出了根据本发明的一个实施例的在基站中实现本地交换 的第二交换装置的结构示意图;
图 6 示出了才艮据本发明的一个实施例的在服务网关中实现本地 交换的第三交换装置的结构示意图;
图 7 示出了根据本发明的一个实施例的在基站中实现切换的第 一切换装置的结构示意图;
图 8 示出了根据本发明的一个实施例的在基站中实现切换的第 二切换装置的结构示意图。 具体实施方式
不失一般性地,本发明中的以下实施例均是应用于 LTE网络中。 本领域技术人员应能理解, 本发明的核心和实盾也可以应用于其他 移动通信网络。
图 1 示出了根据本发明的一个实施例的在移动通信网络中实现 本地交换的方法流程图。 如图所示, 该实施例的移动通信系统中包 括: 服务网关 10、 基站 1 1、 基站 12、 主叫方 (用户设备) 15、 被叫 方 (用户设备) 16。 具体场景为: 基站 11和基站 12均接入服务网 关 10, 主叫方 16接入基站 12, 被叫方 15接入基站 11, 主叫方 16 发起到被叫方 15的通信连接。以下详细描述该实施例中的方法流程。
在步骤 S101 中, 服务网关 10、 基站 12、 主叫方 16之间进行非 接入层信令消息传输。
在步骤 S102中, 服务网关 10从基站 12和主叫方 16处获取被 叫方 15的信息。
在步骤 S103中, 服务网关 10向被叫方 15进行寻呼。
在步骤 S104中, 被叫方 15和基站 11之间进入随机接入过程。 在步驟 S105 中, 被叫方 15 和基站 11 之间建立无线资源控制
( Radio Resource Control, RRC )层连接。 其中包括: 被叫方 15向 基站 11发送无线资源控制层连接请求消息; 基站 11向被叫方 15发 送无线资源控制层连接建立消息; 被叫方 15向基站 11发送无线资 源控制层连接建立完成消息。
在步骤 S106中, 基站 11向服务网关 10发送初始化用户信息。 本领域技术人员应能理解, 在步骤 S106之后, 服务网关 10获 取了被叫方 15及其接入的基站 11的信息, 可选地, 服务网关 10将 在主叫方 16和被叫方 15之间的该次通信过程中保存这些信息。
在步骤 S107中, 服务网关 10、 基站 11、 被叫方 15之间进行非 接入层信令消息传输。
在步骤 S108中, 服务网关 10向基站 11发送初始环境建立请求 ( initial context setup request ) 消息。
在步骤 S109中, 被叫方 15和基站 11之间进行无线资源控制层 连接重配。 其中包括: 基站 11 向被叫方 15发送无线资源控制层连 接重配消息; 被叫方 15向基站 11发送无线资源控制层连接重配完 成消息。
在步骤 S110中, 服务网关 10、 基站 11、 被叫方 15之间进行非 接入层信令消息传输。
在步骤 S111 中, 基站 11向服务网关 10发送初始环境建立响应 ( initial context setup response ) 消息。 可选地, 上述步骤 S101至步骤 S111可以与现有 LTE协议规范 保持一致, 以提高本发明中技术方案的兼容性。
以下步骤主要由服务网关 10、 被叫方 15所接入的基站 11、 主 叫方 16所接入的基站 12来分别执行,以实现主叫方 16和被叫方 15 之间通信的本地交换。
在步骤 S112中,服务网关 10将确定主叫方 16所接入的基站 12 和被叫方 15所接入的基站 11是否均接入服务网关 10; 如果是, 则 在步骤 S113 中, 服务网关 10将向被叫方 15所接入的基站 11发送 携带本地交换信息的消息; 其中, 本地交换信息包括: 主叫方标识、 主叫方和被叫方所对应的增强的无线接入承载的标识(E-RAB ID ) 。
通常, 接入同一个服务网关的基站在网络拓朴结构上、 甚至在 实际分布上彼此互为邻居, 从而在这些基站之间存在着建立基于 X2 接口的连接以相互通信的可能性。 因此, 当服务网关 10确定基站 11 和基站 12均接入服务网关 10,则可以发送上述携带本地交换信息的 消息, 以尝试建立基站 11和基站 12之间的基于 X2接口的连接, 用 于承载主叫方 16和被叫方 15之间的通信。 如果主叫方和被叫方接 入同一个基站, 则该基站可以直接交换彼此的数据。 如果主叫方和 被叫方接入不同的基站, 则服务网关 10所发送的携带本地交换信息 的消息中还包括: 主叫方所接入的基站的标识。 如果基站 11和基站 12并非均接入服务网关 10, 则仍可采用现有技术中的方案, 由服务 网关 10作为中间节点来交换主叫方 16和被叫方 15之间的数据。
具体地, 在本发明的一个实施例中, 上述携带本地交换信息的 消息由经过修改的增强无线接入承载建立请求 ( E-RAB SETUP REQUEST ) 消息来实现, 其具体内容定义如下表所示:
Figure imgf000008_0001
> 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
其中, Local Switching UE Info和 Local Switching E-RAB Info是新增 加的字段; 其中, Global eNB ID表示主叫方所接入的基站的标识, eNB UE SIAP ID表示主叫方在上述 Global eNB ID上的标识; E-RAB ID表示可以与被叫方的增强无线接入承载进行本地交换的主叫方的 有关增强无线接入承载。 其余字段可以与现有 LTE协议规范保持一 致, 以提高该消息的兼容性。
在步骤 S113中, 被叫方 15所接入的基站 11将接收来自服务网 关 10的携带本地交换信息的消息; 所述本地交换信息包括: 主叫方 标识、 主叫方和被叫方所对应的增强的无线接入^载的标识。 如前 所述, 携带本地交换信息的消息中还可能包括: 主叫方所接入的基 站的标识。
在步骤 S114 中, 基站 11 将基于所述本地交换信息, 确定自身 (基站 1 1 ) 与主叫方 16所接入的基站 12之间是否存在可用的基于 X2接口的连接。
如果基站 11和基站 12之间存在可用的基于 X2接口的连接, 则 接下来执行以下步骤。
在步骤 S115中, 被叫方 15和基站 11之间进行无线资源控制层 连接重配, 其中包括: 基站 1 1 向被叫方 15发送无线资源控制层连 接重配 (RRC Connection Reconfiguration ) 消息, 然后由被叫方 15 向基站 11 发送无线资源控制层连接重配完成 (RRC Connection Reconfiguration Complete ) 消息。 可选地, 这两个消息可以与现有 LTE协议规范保持一致 , 以提高本发明中方案的兼容性。
在步骤 S1151 中 , 基站 11将发起建立与主叫方 16所接入的基 站 12之间的基于 X2接口连接。
具体地, 在本发明的一个实施例中, 步骤 S1 151由基站 11通过 X2接口向基站 12发送本地交换建立请求 (X2AP: Local Switching SETUP REQ ) 消息来实现, 该消息具体内容定义如下表所示:
Figure imgf000010_0001
其中, eNB UE X2AP ID 表示被叫方的 X2 应用协议标识; Local Switching eNB UE S1AP ID表示主叫方在其所接入的基站中的 SI标 识; E-RAB to be Local Switching List表示被叫方的希望通过 X2接口 进行本地数据交换的有关的增强无线接入承载; E-RAB ID表示可以 与主叫方的增强无线接入承载进行本地交换的被叫方的有关的增强 无线接入承载; GTP Tunnel Endpoint表示 X2传输承载的 GTP( GPRS tunneling protocol )端点,用于传输本地交换的协议数据单元( PDU ) ; Local Switching E-RAB ID表示主叫方的有关的增强无线接入承载的 标识。
在接收到来自被叫方 15所接入的基站 11的基于 X2接口的用于 本地交换的连接建立请求之后, 在步骤 S1152中, 主叫方 16所接入 的基站 12将向基站 11发送基于 X2接口的用于本地交换的连接建立
P向应 具体地, 在本发明的一个实施例中, 步骤 S1 152由基站 12通过
X2接口向基站 11发送本地交换建立响应 (X2AP: Local Switching SETUP RSP ) 消息来实现, 该消息具体内容定义如下表所示:
Figure imgf000011_0001
其中, eNB UE X2AP ID表示主叫方的 X2应用协议标识; Requiring eNB UE X2AP ID 表示被叫方的 X2 应用协议标识; E-RAB successfully to be Local Switching List表示成功地通过 X2连接与被 叫方有关的增强无线接入承载进行本地数据交换的主叫方的有关的 增强无线接入承载; E-RAB ID表示可以与被叫方的增强无线接入承 载进行本地交换的主叫方的有关的增强无线接入承载; GTP Tunnel Endpoint表示 X2传输承载的 GTP端点; E-RAB failed to be Local Switching List表示通过 X2连接与被叫方有关的增强无线接入承载 进行本地数据交换未能成功的主叫方的有关的增强无线接入承载。
可选地, 在本发明的一些实施例中, 还包括一个步骤 S116, 由 被叫方 15所接入的基站 1 1向服务网关 10发送消息, 该消息携带了 关于基于 X2接口的连接是否建立成功的指示,该连接用于承载主叫 方 16与被叫方 15之间的通信。 该消息可以由经过 改的增强无线 接入承载建立响应 ( E-RAB SETUP RESPONSE ) 消息来实现; 具体 地, 可以在现有的增强无线接入承载建立响应消息中增加一个可选 字段 Local Switching Setup Success Flag;如果在所有的增强无线接入 承载建立项目 ( E-RAB Setup Item ) 中均不存在该字段, 意味着这个 基站不支持本地交换功能; 如果该字段的值为假, 意味着这个基站 为有关的增强无线接入承载建立本地交换数据路径失败; 如果该字 段的值为真, 意味着这个基站成功地为有关的增强无线接入承载建 立本地交换数据路径。
接下来, 如果上述用于承载主叫方 16与被叫方 15之间的通信 的基于 X2接口的连接建立成功,则基站 1 1和基站 12通过该连接相 互发送被叫方 15和主叫方 16之间通信的数据。
可选地, 在上述流程中, 即使基站指示本地交换数据路径建立 成功, 服务网关 10仍保留分配给主叫方 16和被叫方 15的有关的增 强无线接入承载的用户层面信息。 则对于服务网关 10而言, 主叫方 16与服务网关 10之间的数据路径以及被叫方 15与月良务网关 10之间 的数据路径仍然是有效的。 基站则为主叫方 16和被叫方 15分别保 留服务网关的用户平面信息。 因此, 在主叫方 16和被叫方 15之间 通信过程中, 随时可以中止基于 X2接口的本地交换数据路径, 转而 采用通过服务网关 10进行交换的、 基于 S1接口的数据路径。
当用户设备 15和用户设备 16之一发生切换时,基于 X2接口的 本地交换数据路径可能受到影响。
当发生基站内的越区切换时,原来的基于 X2接口的本地交换数 据路径仍可保持不变。
当发生跨基站的越区切换时,原来的基于 X2接口的本地交换数 据路径将终止。
图 2 示出了根据本发明的一个实施例的在移动通信网络中实现 切换的方法流程图。 如图所示, 该实施例的移动通信系统中包括: 服务网关 20、 基站 21、 基站 22、 基站 23、 用户设备 25、 用户设备 26。 具体场景为: 基站 21、 22、 23均接入服务网关 20, 第一用户设 备 25和第二用户设备 26正在相互通信, 第二用户设备 26接入基站 21 , 第一用户设备 25的接入正准备从基站 22切换到基站 23。 以下 详细描述该实施例中的方法流程。
在步骤 S201 中, 用户设备 25向基站 22发送测量报告。
根据测量报告以及来自核心网 (例如来服务网关 20 ) 的指示, 基站 22获知: 将由基站 23接替自身 (基站 22 )来提供用户设备 25 的接入服务。
在步骤 S202中,第一用户设备 25所接入的基站 22将向基站 23 发送有关于用户设备 25与用户设备 26之间的通信的切换请求。
具体地, 在本发明的一个实施例中, 步骤 S202 由基站 22向服 务网关 20发送基于 S 1接口的切换请求消息来实现。服务网关 20将 把该切换请求转发给基站 23。
具体地, 在本发明的另一个实施例中, 基站 22和基站 23之间 存在 X2接口连接, 步骤 S202由第一用户设备 25所接入的基站 22 通过 X2 接口向基站 23 发送经过修改的切换请求 ( X2AP :
HANDOVER REQUEST ) 消息来实现, 该消息具体内容定义如下:
Figure imgf000013_0001
»> 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
其中, Global eNB ID表示通信的对方所接入的基站, 亦即第二用户 设备 26接入的基站 21, 的标识; eNB UE X2AP ID表示通信的对方, 亦即第二用户设备 26在上述 Global eNB ID上的 X2应用协议标识; Local Switching E-RAB ID表示可以与本方(第一用户设备 25 )的增 强无线接入承载进行本地交换的对方 (第二用户设备 26 ) 的有关增 强无线接入承载; 这三个字段均为新增字段。 其余字段可以与现有 LTE协议规范保持一致 , 以提高该消息的兼容性。
在步骤 S203中, 基站 23将接收有关于第一用户设备 25和第二 用户设备 26之间的通信的切换请求的消息。 如前所述, 在本发明的 不同实施例中, 该切换请求消息可以是基于 X2接口的、 或者是基于 S1接口的。
在步骤 S204中, 基站 23将确定其自身与第二用户设备 26所接 入的基站 21之间是否存在可用的机基于 X2接口的连接。 可选地, 基站 23还将分配若干 GTP端点资源: 其中之一基于 X2接口, 用于 基站 22转发数据; 其中另一用于基于 S 1接口的传统的数据交换路 径; 其中另一基于 X2接口, 用于基站 21与基站 23之间的本地交换 数据路径。
如果基站 23和基站 22之间存在可用的基于 X2接口的连接, 则 接下来执行以下步骤。
在步骤 S205中, 基站 23将发起建立与第二用户设备 26所接入 的基站 21之间的基于 X2接口连接, 该连接用于承载第一用户设备 25与第二用户设备 26之间的通信。
具体地, 步驟 S205由基站 23通过 X2接口向基站 21发送本地 交换切换请求 (X2AP: Local Switching HO REQ ) 消息来实现, 该 消息具体内容定义如下表所示:
Figure imgf000015_0001
其中, eNB UE X2AP ID表示第一用户设备25的 X2应用协议标识; Local Switching eNB UE X2AP ID表示第一用户设备 26在其所接入 的基站 21中的 X2应用协议标识,该字段可以被 Local Switching eNB UE S IAP ID字段取代, 这取决于步骤 S202中的切换请求消息是基 于 X2接口还是 S1接口; E-RAB to be Local Switching List表示第一 用户设备 25的希望通过 X2接口进行本地数据交换的有关的增强无 线接入承载; E-RAB ID表示可以与第二用户设备 26的增强无线接 入承载进行本地交换的第一用户设备 25 的有关的增强无线接入承 载; GTP Tunnel Endpoint表示 X2传输承载的 GTP端点, 用于传输 本地交换的协议数据单元; Local Switching E-RAB ID表示第二用户 设备 26的有关的增强无线接入承载的标识。
在步骤 S206中, 第二用户设备 26所接入的基站 21将停止向基 站 22发送第二用户设备 26至第一用户设备 25的数据, 并分配基站 21与基站 23之间的基于 X2接口的资源用于本地交换。
在步骤 S207中, 基站 21将响应基站 23所发起的建立基于 X2 接口连接。 具体地, 步骤 S207由基站 21通过 X2接口向基站 23发送本地 交换切换响应 (X2AP: Local Switching HO RSP )消息来实现, 该消 息具体内容定义如下表所示:
Figure imgf000016_0001
其中, eNB UE X2AP ID表示第二用户设备 26的 X2应用协议标识; Requiring eNB UE X2AP ID表示第一用户设备 25的 X2应用协议标 识; E-RAB successfully to be Local Switching List表示成功地通过 X2 连接与第一用户设备 25有关的增强无线接入承载进行本地数据交换 的第二用户设备 26的有关的增强无线接入承载; E-RAB ID表示可 以与第一用户设备 25的增强无线接入承载进行本地交换的第二用户 设备 26的有关的增强无线接入承载; GTP Tunnel Endpoint表示 X2 传输承载的 GTP端点; E-RAB failed to be Local Switching List表示 通过 X2连接与第一用户设备 25有关的增强无线接入承载进行本地 数据交换未能成功的第二用户设备 26的有关的增强无线接入承载。
本领域技术人员应能理解, 如果步骤 S202中的切换请求消息是 基于 S1接口的,步骤 S205中的本地交换切换请求消息以及步骤 S207 中的本地交换切换响应消息在内容上可以分别与前述实施例中步骤 S1151 中的本地交换建立请求消息以及步骤 S1152 中的本地交互建 立响应消息相一致。
在步骤 S208中,第二用户设备 26所接入的基站 21将向基站 23 发送 (第二用户设备 26至第一用户设备 25的)数据。 在步骤 S209 中, 基站 23 将向基站 22 发送切换请求确认 ( HANDOVER REQUEST ACKNOWLEDGE ) 消息。
具体地, 如前述本发明的一个实施例中, 步骤 S202中的切换请 求消息是基于 S1接口的; 则相应地, 步骤 S209中由基站 23向服务 网关 20发送基于 S1接口的切换请求确认消息。 服务网关 20将把该 切换请求确认转发给基站 22。
具体地, 如前述本发明的另一个实施例中, 步骤 S202中的切换 请求消息是基于 X2接口的; 则相应地, 步驟 S209中由基站 23向基 站 22发送基于 X2接口的切换请求确认消息, 该消息具体内容定义 ^口下表所示:
Figure imgf000017_0001
其中, Local Switching Setup Success Flag是新增的可选字段, 用作关 于基站 23与第二用户设备 26所接入的基站 21之间的基于 X2接口 的连接是否建立成功的指示; 如果在所有的增强无线接入承载承认 项目 ( E-RAB Admitted Item ) 中均不存在该字段, 意味着这个基站 不支持本地交换功能; 如果该字段的值为假, 意味着这个基站为有 关的增强无线接入承载建立本地交换数据路径失败; 如果该字段的 值为真, 意味着这个基站成功地为有关的增强无线接入承载建立本 地交换数据路径。 其余字段可以与现有 LTE协议规范保持一致, 以 提高该消息的兼容性。
在接收到来自基站 23 的切换确认请求消息之后, 基站 21将在 步骤 S210中停止发送第一用户设备 25至第二用户设备 26的数据。
在步骤 S21 1 中, 第一用户设备 25 以及其先后接入的基站 22、 基站 23之间将进行无线资源控制层连接重配以及数据转发。 其中包 括:基站 22向第一用户设备 25发送无线资源控制层连接重配( RRC Connection Reconfiguration ) 消息; 基站 22向基站 23发送基于 X2 接口的序列号状态传输 ( SN Status Transfer ) 消息; 基站 22向基站 23转发因为切换操作而缓冲的数据; 第一用户设备 25向基站 23发 送无线资源控制层连接重配完成 (RRC Connection Reconfiguration Complete ) 消息。
在步骤 S212 中, 基站 23将向服务网关 20发送路径交换请求
( PATH SWITCH REQUEST ) 消息。 本领域技术人员应能理解, 该 消息是基于 S1接口的。
至此, 第一用户设备 25的接入服务从基站 22切换到基站 23得 以完成, 第一用户设备 25和第二用户设备 26之间的数据通信通过 基站 21和基站 23之间基于 X2接口的连接仍然可以实现本地交换。
图 3 示出了根据本发明的一个实施例的在移动通信网络中实现 切换的方法流程图。 如图所示, 该实施例的移动通信系统中包括: 服务网关 30、 基站 31、 基站 32、 基站 33、 用户设备 35、 用户设备 36。 具体场景为: 基站 31、 32、 33均接入服务网关 30 , 第一用户设 备 35和第二用户设备 36正在通过基站 31和基站 32之间的 X2接口 连接相互通信, 第二用户设备 36接入基站 31 , 第一用户设备 35的 接入正准备从基站 32切换到基站 33,而基站 31和基站 33之间不存 在基于 X2接口的连接。 以下详细描述该实施例中的方法流程。
在步骤 S301中,基站 32接收来自第一用户设备 35的测量报告, 确定将由基站 33接替自身 (基站 32 ) 来提供用户设备 35的接入服 务。
在步骤 S302中, 基站 32向基站 33发送有关于用户设备 35与 用户设备 36之间的通信的切换请求消息。
在步骤 S303中, 基站 33向基站 32发送切换请求确认消息。 当基站 32和基站 33之间存在基于 X2接口的连接, 则切换请求 消息和切换请求确认消息可以是基于 X2接口的。
在步骤 S304中,基站 32将停止向基站 31发送第一用户设备 35 至第二用户设备 36的数据, 并緩沖基于 X2接口的数据, 准备好从 服务网关 30接收数据。
在步骤 S305中, 基站 32将向第一用户设备 35发送无线资源控 制层连接重配消息。
在步骤 S306中, 基站 32将向基站 31发送一个基于 X2接口的 本地交换切换指示 ( Local Switching HO Indication ) 消息。
在步驟 S307中,基站 31将停止向基站 32发送第二用户设备 36 至第一用户设备 35的数据, 转而将这样的数据发送给服务网关 30。 同时, 基站 31还将向基站 32发送承载截止标记 (End Marker ) 的 GDP数据, 用于向基站 32指示经过基于 X2接口的连接所发送的最 后一个数据包。 当基站 32接收到截止标记后, 意味着不会再从这个 基于 X2接口是连接接收到来自基站 31的数据。
在步骤 S308 中, 基站 32在接收到截止标记之后终止緩沖基于
X2接口的数据。
之后, 第二用户设备 36至第一用户设备 35 的数据将通过服务 网关 30转发给基站 32。
在步骤 S309中, 基站 32接收来自服务网关 30的数据并緩冲这 些数据。
在步骤 S310中, 基站 32将向基站 33发送基于 X2接口的序列 号状态传输 (SN Status Transfer ) 消息。 同时, 基站 32将向基站 33 转发緩冲的 (第二用户设备 36至第一用户设备 35的) 数据。
在步骤 S31 1 中, 第一用户设备 35将向基站 33发送无线资源控 制层连接重配完成( RRC Connection Reconfiguration Complete )消息。 在步骤 S312 中, 基站 33将向服务网关 30发送路径交换请求 ( PATH SWITCH REQUEST ) 消息。 本领域技术人员应能理解, 该 消息是基于 S1接口的。
至此, 第一用户设备 35的接入服务从基站 32切换到基站 33得 以完成, 第一用户设备 35和第二用户设备 36之间的数据通信通过 服务网关 30、 基于传统的 S1接口的连接实现交换。
上述流程中, 仅有步骤 S306中的本地交换切换指示消息是新增 加于 X2接口的。
图 4 示出了根据本发明的一个实施例的在基站中实现本地交换 的第一交换装置的结构示意图。 如图所示, 第一交换装置 100包括: 第一接收装置 101、 第一确定装置 102、 第一处理装置 103。 第一交 换装置 100典型地设置于图 1所示实施例中的被叫方 15所接入的基 站 1 1中。
第一接收装置 101 用于接收来自服务网关的携带本地交换信 息的消息, 所述本地交换信息包括: 主叫方标识、 主叫方和被叫方 所对应的增强的无线接入承载的标识。
第一确定装置 102用于基于所述本地交换信息,确定所述基站 与所述主叫方所接入的基站之间是否存在可用的基于 X2 接口的连 接。
第一处理装置 103 用于如果所述基站与所述主叫方所接入的 基站之间存在可用的基于 X2接口的连接,则发起建立与所述主叫方 所接入的基站之间的基于 X2接口的连接。
结合图 1所示实施例, 第一接收装置 101用于完成步骤 S113 , 第一确定装置 102用于执行步骤 S1 14, 第一处理装置 103用于执行 步骤 S1 151。
图 5 示出了根据本发明的一个实施例的在基站中实现本地交 换的第二交换装置的结构示意图。 如图所示, 第二交换装置 200 包 括: 第二接收装置 201、 第一响应装置 202。 第二交换装置 200典型 地设置于图 1所示实施例中的主叫方 16所接入的基站 12中。
第二接收装置 201 用于接收来自被叫方所接入的基站的基于 X2接口的用于本地交换的连接建立请求。
第一响应装置 202 用于向所述被叫方所接入的基站发送基于 X2接口的用于本地交换的连接建立响应。
结合图 1所示实施例,第二接收装置 201用于完成步骤 S1 151 , 第一响应装置 202用于执行步骤 S1152。
图 6 示出了根据本发明的一个实施例的在服务网关中实现本 地交换的第三交换装置的结构示意图。如图所示, 第三交换装置 300 包括第二处理装置 301。第三交换装置 300典型地设置于图 1所示实 施例中的服务网关 10中。
第二处理装置 301用于:确定主叫方所接入的基站和被叫方所 接入的基站是否均接入所述服务网关, 如果是, 向所述被叫方所接 入的基站发送携带本地交换信息的消息; 所述本地交换信息包括: 主叫方标识、 主叫方和被叫方所对应的增强的无线接入 载的标识。
结合图 1所示实施例, 第三交换装置 300用于完成步骤 S1 12 和步骤 S113。
图 7 示出了根据本发明的一个实施例的在基站中实现切换的 第一切换装置的结构示意图。 如图所示, 第一切换装置 400 包括: 第三接收装置 401、 第二确定装置 402、 第三处理装置 403。 第一切 换装置 400典型地设置于图 2所示实施例中的基站 23中。
第三接收装置 401 用于接收有关于第一用户设备与第二用户 设备之间的通信的切换请求。
第二确定装置 402 用于确定所述基站与所述第二用户设备所 接入的基站之间是否存在可用的基于 X2接口的连接。
第三处理装置 403用于:如果所述基站与所述第二用户设备所 接入的基站之间存在可用的基于 X2接口的连接,则发起建立与所述 第二用户设备所接入的基站之间的基于 X2接口的连接,该连接用于 承载所述第一用户设备与第二用户设备之间的通信。
结合图 2所示实施例, 第三接收装置 401用于实现步骤 S203 , 第二确定装置 402用于执行步骤 S204, 第三处理装置 403用于执行 步骤 S205。 图 8 示出了根据本发明的一个实施例的在基站中实现切换的 第二切换装置的结构示意图。 如图所示, 第二切换装置 500 包括: 第一发送装置 501、 第四接收装置 502、 第四处理装置 503。 第二切 换装置 500典型地设置于图 2所示实施例中第一用户设备 25所接入 的基站 22中。
第一发送装置 501 用于向另一基站发送有关于所述第一用户 设备与第二用户设备之间的通信的切换请求。
第四接收装置 502 用于接收来自所述另一基站的切换请求确 认。
第四处理装置 503 用于停止发送所述第一用户设备至所述第 二用户设备的数据。
结合图 2所示实施例, 第一发送装置 501用于执行步骤 S202 , 第四接收装置 502用于完成步骤 S209 , 第四处理装置 503用于执行 步骤 S210。
本发明中所称的装置, 可以由软件功能模块实现, 也可以由硬 件模块实现, 还可以由软硬件的结合来实现。
本领域技术人员应能理解,上述实施例均是示例性而非限制性 益效果。 本领域技术人员在研究附图、 说明书及权利要求书的基础 上, 应能理解并实现所揭示的实施例的其他变化的实施例。 在权利 要求书中, 术语 "包括" 并不排除其他装置或步骤; 不定冠词 "一 个" 不排除多个; 术语 "第一" 、 "第二" 用于标示名称而非用于 表示任何特定的顺序。 权利要求中的任何附图标记均不应被理解为 对保护范围的限制。 权利要求中出现的多个部分的功能可以由一个 单独的硬件或软件模块来实现。 某些技术特征出现在不同的从属权 利要求中并不意味着不能将这些技术特征进行组合以取得有益效 果。

Claims

权 利 要 求 书
1. 一种在基站中实现本地交换的方法, 其中被叫方接入所述基 站, 所述方法包括以下步骤:
接收来自服务网关的携带本地交换信息的消息;所述本地交换信 息包括: 主叫方标识、 主叫方和被叫方所对应的增强的无线接入承 载的标识;
基于所述本地交换信息,确定所述基站与所述主叫方所接入的基 站之间是否存在可用的基于 X2接口的连接;
如果所述基站与所述主叫方所接入的基站之间存在可用的基于 X2接口的连接, 则发起建立与所述主叫方所接入的基站之间的基于 X2接口的连接。
2. 根据权利要求 1所述的方法, 其特征在于, 还包括步骤: 如果所述基于 X2接口的连接建立成功, 通过所述基于 X2接口 的连接发送所述被叫方至所述主叫方的数据。
3. 根据权利要求 1或 2所述的方法, 其特征在于, 还包括步骤: 向所述服务网关发送消息, 该消息携带了关于所述基于 X2接口 的连接是否建立成功的指示。
4. 一种在基站中实现本地交换的方法, 其中主叫方接入所述基 站, 所述方法包括步骤:
接收来自被叫方所接入的基站的基于 X2接口的用于本地交换的 连接建立请求;
向所述被叫方所接入的基站发送基于 X2接口的用于本地交换的 连接建立响应。
5. 一种在服务网关中实现本地交换的方法, 包括以下步骤: 确定主叫方所接入的基站和被叫方所接入的基站是否均接入所 述服务网关, 如果是, 向所述被叫方所接入的基站发送携带本地交 换信息的消息; 所述本地交换信息包括: 主叫方标识、 主叫方和被 叫方所对应的增强的无线接入承载的标识。
6. 一种在基站中实现切换的方法, 包括以下步骤: 接收有关于第一用户设备与第二用户设备之间的通信的切换请 求;
确定所述基站与所述第二用户设备所接入的基站之间是否存在 可用的基于 X2接口的连接;
如果所述基站与所述第二用户设备所接入的基站之间存在可用 的基于 X2接口的连接,则发起建立与所述第二用户设备所接入的基 站之间的基于 X2接口的连接,该连接用于承载所述第一用户设备与 第二用户设备之间的通信。
7. 根据权利要求 6所述的方法, 其特征在于, 还包括步骤: 如果所述基于 X2接口的连接建立成功, 通过所述基于 X2接口 的连接发送所述第一用户设备至所述第二用户设备的数据。
8. 根据权利要求 6或 7所述的方法, 其特征在于,
所述切换请求是基于 X2接口或 S 1接口的;
所述方法还包括步骤:
向所述第一用户设备所接入的基站发送切换请求确认,该切换请 求确认携带了关于所述基于 X2接口的连接是否建立成功的指示。
9. 一种在基站中实现切换的方法, 其中第一用户设备接入所述 基站, 所述方法包括以下步骤:
向另一基站发送有关于所述第一用户设备与第二用户设备之间 的通信的切换请求;
接收来自所述另一基站的切换请求确认;
停止发送所述第一用户设备至所述第二用户设备的数据。
10. 根据权利要求 9所述的方法, 其特征在于, 所述切换请求确 认携带了关于所述另一基站与所述第二用户设备所接入的基站之间 的基于 X2接口的连接是否建立成功的指示。
1 1. 一种在基站中实现本地交换的第一交换装置, 其中被叫方接 入所述基站, 所述第一交换装置包括:
第一接收装置,用于接收来自服务网关的携带本地交换信息的消 息; 所述本地交换信息包括: 主叫方标识、 主叫方和被叫方所对应 的增强的无线接入承栽的标识; 第一确定装置, 用于基于所述本地交换信息, 确定所述基站与所 述主叫方所接入的基站之间是否存在可用的基于 X2接口的连接; 第一处理装置,用于如果所述基站与所述主叫方所接入的基站之 间存在可用的基于 X2接口的连接,则发起建立与所述主叫方所接入 的基站之间的基于 X2接口的连接。
12. 一种在基站中实现本地交换的第二交换装置, 其中主叫方接 入所述基站, 所述第二交换装置包括:
笫二接收装置, 用于接收来自被叫方所接入的基站的基于 X2接 口的用于本地交换的连接建立请求;
第一响应装置, 用于向所述被叫方所接入的基站发送基于 X2接 口的用于本地交换的连接建立响应。
13. 一种在服务网关中实现本地交换的第三交换装置, 包括: 第二处理装置, 用于: 确定主叫方所接入的基站和被叫方所接入 的基站是否均接入所述服务网关, 如果是, 向所述被叫方所接入的 基站发送携带本地交换信息的消息; 所述本地交换信息包括: 主叫 方标识、 主叫方和被叫方所对应的增强的无线接入 载的标识。
14. 一种在基站中实现切换的第一切换装置, 包括:
第三接收装置,用于接收有关于第一用户设备与第二用户设备之 间的通信的切换请求;
第二确定装置,用于确定所述基站与所述第二用户设备所接入的 基站之间是否存在可用的基于 X2接口的连接;
第三处理装置, 用于: 如果所述基站与所述第二用户设备所接入 的基站之间存在可用的基于 X2接口的连接,则发起建立与所述第二 用户设备所接入的基站之间的基于 X2接口的连接,该连接用于承载 所述第一用户设备与第二用户设备之间的通信。
15. —种在基站中实现切换的第二切换装置, 其中第一用户设备 接入所述基站, 所述第二切换装置包括:
第一发送装置,用于向另一基站发送有关于所述第一用户设备与 第二用户设备之间的通信的切换请求;
第四接收装置, 用于接收来自所述另一基站的切换请求确认; 第四处理装置,用于停止发送所述第一用户设备至所述第二用户 设备的数据。
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