CN102598786B - Switching method between base stations, base stations and communication system - Google Patents

Switching method between base stations, base stations and communication system Download PDF

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Publication number
CN102598786B
CN102598786B CN201180002622.2A CN201180002622A CN102598786B CN 102598786 B CN102598786 B CN 102598786B CN 201180002622 A CN201180002622 A CN 201180002622A CN 102598786 B CN102598786 B CN 102598786B
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base station
mme
target
source base
link
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CN102598786A (en
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李婧媛
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Abstract

This invention provides a switching method between base stations, base stations and a communication system. The method includes: sending switching-request information from a source base station to a target base station to switch user equipments to which the said source base stations provides service to cells of the target base stations. According to S1 link state information among the target base stations and a mobile management entity which provides service to the source base stations and has the UE residing in, the source base stations confirm and perform either X2 link switching or S1 link switching. This invention also provides a base station and a communication system. This invention can select the most suitable switching method between X2 link switching and S1 link switching to successfully switch source eNBs to target eNBs.

Description

Changing method, base station and communication system between base station
Technical field
The embodiment of the present invention relates to mobile communication technology field, relates in particular to a kind of for realizing the technical scheme of switching between base station.
Background technology
3GPP Long Term Evolution (Long Term Evolution, hereinafter to be referred as LTE) system is very promising mobile communication system, it comes from traditional universal mobile telecommunications system (Universal Mobile Telecommunications System, UMTS) network, can provide higher wireless access rate and better business support.
Taking LTE system as example, it adopts flat wireless access network (Radio Access Network is called for short RAN) structure, has cancelled radio network controller (Radio Network Control is called for short RNC).As shown in Figure 1, LTE system comprises that evolution base station (evolved-NodeB is called for short eNB) and Evolved Packet Core (Evolved Packer Core Network is called for short EPC) form.Between eNB, be connected by X2 interface, between eNB and EPC, be connected by S1 interface.EPC comprises mobile management entity (Mobility Management Entity is called for short MME) and System Architecture Evolution gateway (SAE GateWay is called for short SGW).For example, MME, as chain of command part, is responsible for the mobile management of chain of command, comprises user's context and mobile status management, distributing user temporary identity mark etc.Between eNB and MME, by agency (proxy) function of S1 interface, realize the transmission of chain of command signaling between eNB and MME.And for example, SGW, as user's face portion, is that downlink data is initiated paging under responsible idle condition, and Internet Protocol (Internet Protocol is called for short IP) bearing parameter and the interior routing iinformation of network etc. are preserved in management.Between eNB and SGW, by agency (proxy) function of S1 interface, realize the transmission of user's plane signaling between eNB and SGW.
In wireless telecommunication system, switching is the fundamental characteristics that keeps business continuance, by improving handover success rate, can ensure the business continuance of terminal.So-called switching, refer to that work as terminal moves to another eNBXia community from a GeeNBXia community in communication process, or while causing terminal call Quality Down due to external interference, need to change the original voice channel of terminal and be transferred in a new idle voice channel, to continue to keep the process of call.
In the wireless telecommunication system based on LTE technology, above-mentioned switching can be divided into the X2 link switching between S1 link switching and the eNB between eNB and EPC.The eNB that initiates to switch can be called source eNB, and the eNB that receives handover request can be called target eNB.
At present, industry is expected the changing method between a kind of eNB, in the time that source eNB initiates handover request to target eNB, can in X2 link switching and S1 link switching, select applicable changing method, successfully to carry out the switching of source eNB to target eNB.
Summary of the invention
The embodiment of the present invention provides changing method, base station and the communication system between a kind of base station, for how solving the problem of selecting suitable changing method at X2 link switching and S1 link switching.
An aspect of of the present present invention provides the changing method between a kind of base station, comprising:
Source base station sends handover request message to target BS, for described source base station being provided the subscriber equipment User Equipment (UE) of service switch to described target BS Xia community;
Described source base station according to described target BS, and serve the S1 link-state information between described source base station and the resident mobile management entity Mobile Management Entity (MME) of described UE, confirm to carry out X2 link switching or S1 link switching.
Another aspect of the present invention provides the changing method between a kind of base station, comprising:
The handover request message that target BS reception sources base station sends, for providing described source base station the subscriber equipment User Equipment (UE) of service to switch to described target BS Xia community;
Described target BS sends described target BS, and serves the S1 link-state information between described source base station and the resident mobile management entity Mobile Management Entity (MME) of described UE to described source base station, confirms to carry out X2 link switching or S1 link switching for described source base station.
Another aspect of the present invention provides a kind of base station, comprising:
Transmitting element, for sending handover request message to target BS, to provide the subscriber equipment User Equipment (UE) of service to switch in described target BS Xia community described base station;
Processing unit, for according to described target BS, with the S1 link-state information of serving between described base station and the resident mobile management entity Mobile Management Entity (MME) of described UE, X2 link switching or S1 link switching are carried out in confirmation.
One side more of the present invention provides a kind of base station, comprising:
Receiving element, the handover request message sending for reception sources base station, to provide the subscriber equipment User Equipment (UE) of service to switch in Xia community, described base station described source base station;
Transmitting element, for send to described source base station described base station, with the S1 link-state information of serving between described source base station and the resident mobile management entity Mobile Management Entity (MME) of described UE so that X2 link switching or S1 link switching are carried out in the confirmation of described source base station.
One side more of the present invention provides a kind of communication system, comprising:
One source base station and a target BS;
Described source base station, for sending handover request message to target BS, to provide the subscriber equipment User Equipment (UE) of service to switch in described target BS Xia community described base station; And according to described target BS, and serve the S1 link-state information between described source base station and the resident mobile management entity Mobile Management Entity (MME) of described UE, carry out X2 link switching or S1 link switching;
Described target BS, the handover request message sending for reception sources base station; And send described target BS, and serve the S1 link-state information between described source base station and the resident MME of described UE to described source base station.
Changing method, base station and communication system between base station of the present invention, for ensureing to select applicable changing method at X2 link switching and S1 link switching, successfully to carry out the switching of source eNB to target eNB, realize terminal and switch to target eNB Xia community from YuaneNBXia community.
Brief description of the drawings
Fig. 1 is the configuration diagram of LTE system in prior art;
Fig. 2 is the flow chart of the changing method between the base station of one embodiment of the invention;
Fig. 3 is the flow chart of the changing method between the base station of another embodiment of the present invention;
Fig. 4 is the flow chart of the changing method between the base station of another embodiment of the present invention;
Fig. 5 is the flow chart of the changing method between the base station of another embodiment of the present invention;
Fig. 6 is the architecture of base station schematic diagram of another embodiment of the present invention;
Fig. 7 is the architecture of base station schematic diagram of another embodiment of the present invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to the scope of protection of the invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
In conjunction with terminal and/or base station, various aspects are described herein.
Terminal, refers to the equipment that voice and/or data connectivity are provided to user, comprises wireless terminal or catv terminal.Wireless terminal can be other treatment facilities that have the portable equipment of wireless connecting function or be connected to radio modem, the mobile terminal communicating through wireless access network (Radio Access Network is called for short RAN) and one or more core net.For example, wireless terminal can be mobile phone (or being called " honeycomb " phone) and the computer with mobile terminal.And for example, wireless terminal can be also portable, pocket, hand-hold type, mobile device built-in computer or vehicle-mounted.For another example, wireless terminal can also be Personal Communications Services (Personal Communication Service, be called for short PCS) phone, cordless telephone, Session initiation Protocol (Session Initiated Protocol, be called for short SIP) phone, wireless local loop (Wireless Local Loop, be called for short WLL) stand, the equipment such as personal digital assistant (Personal Digital Assistant, abbreviation PDA).For another example, wireless terminal also can be called system, subscriber unit (Subscriber Unit), subscriber station (Subscriber Station), mobile radio station (Mobile Station), travelling carriage (Mobile), distant station (Remote Station), access point (Access Point), remote terminal (Remote Terminal), (Access Terminal) accesses terminal, user terminal (User Terminal), user agent (User Agent), subscriber equipment (User Device), or subscriber's installation (User Equipment, be called for short UE).
Base station, refer to finger network in aloft on interface by the equipment of one or more communities and wireless terminal communications.Base station can be used for the air frame of receiving and Internet protocol (Internel Protocol, be called for short IP) divide into groups mutually to change, as the router between wireless terminal and the remainder of Access Network, wherein the remainder of Access Network can comprise IP network.Base station is the attribute management of tunable air interface also.For example, base station can be base station (the Base Transceiver Station in GSM or CDMA, be called for short BTS), also can be the base station (NodeB) in WCDMA, can also be evolved base station (the evolutional Node B in LTE, be called for short NodeB or eNB or e-NodeB), the present invention does not limit this.
In addition, term " system " and " network " are often used interchangeably in this article herein.Term "and/or" herein, is only a kind of incidence relation of describing affiliated partner, and expression can exist three kinds of relations, and for example, A and/or B, can represent: individualism A, exists A and B, these three kinds of situations of individualism B.In addition, character "/" herein, generally represents that forward-backward correlation is to liking a kind of relation of "or".
Different embodiments of the invention, X2 link switching refers to the mobile management that does not relate to EPC reorientation.For example, when UE moves or switches in while carrying out in same MME in a MME group, handoff procedure does not relate to MME and SGW, by source base station directly and target BS undertaken alternately, carrying out X2 link switching by X2 interface.S1 link switching refers to the mobile management that relates to EPC reorientation.In the time that UE moves in Liang Ge MME group, or there is no X2 interface between source base station and target BS, or target BS and serve source base station and MME that UE is resident between while thering is no S1 interface, need to carry out MME reorientation, carry out S1 link switching.
Wherein, the handoff procedure of X2 link, comprising:
201:UE is to source base station reporting measurement reports.
202: source base station sends X2 link switching request message to target BS.
Above-mentioned X2 link switching request message comprises that target BS is to switch to prepare the necessary information of resource, as the signaling context reference information of UE in source base station, S1 signaling context reference information, the mark of Target cell etc. of UE.
203: target BS sends X2 link switching request acknowledge message to source base station.
204: source base station, to the target BS state information that transmits Sequence Number, is realized the synchronous of source base station and target BS.
205: source base station sends Radio Resource control (Radio Resource Control is called for short RRC) to UE and connects reconfiguration message.
206:UE sends RRC connection to target BS and has reshuffled message.
207: target BS is to MME transmit path handover request message (Path Switch Request).
In the handover request of above-mentioned path, carry the instruction of target BS to MME acquisition request UE user profile.
208:MME is to target BS transmit path switch acknowledgment message (Path Switch Acknowledge).
The user profile of carrying UE in the switch acknowledgment message of above-mentioned path.
209: target BS sends and discharges UE context message to source base station.
In normal X2 link switching process, the user profile of carrying UE in the path switch acknowledgment message that MME sends to target BS, subsequently, target BS sends and discharges UE context message to source base station, notification source base station X2 link switching completes smoothly, can discharge the resource originally taking.
But, when target BS and serve source base station and MME that UE is resident between S1 link abnormal when unavailable, MME just cannot obtain the user profile of above-mentioned UE.Although target BS can by the MME of target side group, search out and target BS between S1 link be MME1 good for use, and path handover request message is sent to MME1.But in non-resident MME1, therefore there is no the user profile of UE in MME1, MME1 does not process above-mentioned path handover request message because UE resides in MME, cause target BS to wait for that path switch acknowledgment message is overtime, the failure of X2 link switching.
Different embodiments of the invention, can according to target BS and serve source base station and MME that UE is resident between S1 link-state information, indicate described target BS and serve described source base station and MME that described UE is resident between S1 link whether normal, carry out S1 link switching or X2 link switching with judgement source base station and target BS, successfully carry out the switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Below, by reference to the accompanying drawings each specific embodiment is elaborated.
One embodiment of the invention provides the changing method between a kind of base station, as shown in Figure 2, comprising:
301: source base station sends handover request message to target BS, for described source base station being provided the subscriber equipment User Equipment (UE) of service switch to described target BS Xia community.
302: described source base station according to described target BS, and serve the S1 link-state information between described source base station and the resident mobile management entity Mobile Management Entity (MME) of described UE, confirm to carry out X2 link switching or S1 link switching.
In 301, when the MME group that described source base station is confirmed to serve the MME group of described source base station and served described target BS has X2 link between identical MME group identification (being called for short MME Group ID) and described source base station and described target BS when normal, described source base station is to described target BS transmission X2 link switching request message.Now, source base station default sources base station and target BS provide service by same MME, and X2 link can use, therefore, switching between source base station and target BS, without the S1 link through MME, can directly be completed and be switched action by the X2 link between source base station and target BS.
In the present embodiment, can MME of unique identification by two identifiers, above-mentioned identifier is respectively MME Group ID and MME key (being called for short MME Code).Source base station can be by self obtaining the MME Group ID that the MME group of service is provided to it.For example, in the time that source base station is set up S1 link connection with the MME group that serves source base station, source base station can obtain the MME Group ID of the MME group that serves source base station.And, provide each MME in the MME group of service to there is identical MME Group ID to source base station, and different MME Code.Equally, target BS also can be by self obtaining the MME Group ID that the MME group of service is provided to it.And, provide each MME in the MME group of service to there is identical MME Group ID to target BS, and different MME Code.
In the present embodiment, source base station can learn that whether the X2 link between source base station and target BS is normal by dominant mode or stealthy mode.For example, dominant mode is that source base station can obtain by the status indicator of source base station side the state of X2 link.Above-mentioned status indicator represents respectively three kinds of states of X2 link, comprising: disconnection, busy and normal.For example, in the time that status indicator is disconnection by the status indication of X2 link, represent that the physical layer of the X2 link between source base station and target BS does not also configure, X2 link is unavailable.And for example, when status indicator is while being busy by the status indication of X2 link, represent that the physical layer of the X2 link between source base station and target BS is connected, but cannot transmit data via X2 link, X2 link is unavailable.For another example, when status indicator is while being normal by the status indication of X2 link, represent that the physical layer of the X2 link between source base station and target BS is connected, and can transmit data via X2 link, X2 link is good for use.And for example, stealthy mode is that (opposite end of source base station is target BS, and same, the opposite end of target BS is source base station to opposite end for source base station or target BS.) transmit data, if opposite end receives above-mentioned data, show that the X2 link between source base station and target BS is good for use.Those skilled in the art will appreciate that by additive method and also can learn that whether the X2 link between source base station and target BS is normal, do not repeat them here.
In the present embodiment, in the time triggering A3 event, source base station sends handover request message to target BS.Above-mentioned A3 event refers to service quality when adjacent area than the high threshold value in Serving cell.For example, the service quality of target BS Xia community is during than the high threshold value of service quality of the current accompanying source base station Xia community of UE, and source base station sends handover request message to target BS, for UE being switched to target BS Xia community.The definition that those skilled in the art will appreciate that above-mentioned threshold value can be a concrete numerical value, also can be a number range, and the present invention does not limit this.
In 302, serve the resident MME of source base station and subscriber equipment (User Equipment is called for short UE) and remain with the user profile of UE.For example, the user profile of above-mentioned UE can be the fail safe context relevant to UE, roaming restriction, UE ability information etc.
In the present embodiment, the target BS that source base station receiving target base station sends and serve source base station and MME that UE is resident between S1 link-state information.When described target BS and serve described source base station and MME that described UE is resident between S1 link-state information indicate described target BS and serve described source base station and MME that described UE is resident between S1 link when abnormal, source base station stops the X2 link switching with described target BS, then carries out S1 link switching.When described target BS and serve described source base station and MME that described UE is resident between S1 link-state information indicate described target BS and serve described source base station and MME that described UE is resident between S1 link when normal, described source base station and described target BS normally carry out X2 link switching.Or, when source base station do not receive the target BS that target BS sends and serve source base station and MME that UE is resident between S1 link-state information, and target BS sends switch acknowledgment message to source base station, source base station give tacit consent to described target BS according to switch acknowledgment message and serve described source base station and MME that described UE is resident between S1 link normal, source base station and target BS normally carry out X2 link switching.
In the present embodiment, the described target BS of above-mentioned instruction and serve described source base station and MME that described UE is resident between the abnormal S1 link-state information of S1 link can be carried at the switching that target BS sends to source base station and prepare in failed message (HANDOVER PREPARATION FAILURE).For example, increase a cause value switching in transport network layer cause value (the Transport Network Layer cause) cell of preparing in failed message, above-mentioned cause value represent target BS and serve described source base station and MME that described UE is resident between S1 link extremely cannot use.Source base station receives after above-mentioned cause value, can adjudicate the X2 link switching that cannot carry out between source base station and target BS, need to stop X2 link switching, then carries out S1 link switching.
Therefore, the target BS that the present embodiment can send to source base station according to target BS and serve source base station and MME that UE is resident between S1 link-state information, indicate described target BS and serve described source base station and MME that described UE is resident between S1 link whether normal, carry out S1 link switching or X2 link switching with judgement source base station and target BS, successfully carry out the switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides the changing method between a kind of base station, as shown in Figure 3, comprising:
401: source base station obtains the MME key MME Code that serves described source base station and the resident MME of described UE.
402: described source base station receives the MME Code set of the MME group that serves described target BS of described target BS transmission, the S1 link between MME and the described target BS of the MME Code representative in described MME Code set is normal.
403: source base station sends handover request message to target BS, for described source base station being provided the subscriber equipment User Equipment (UE) of service switch to described target BS Xia community.
404: described source base station according to described target BS, and serve the S1 link-state information between described source base station and the resident mobile management entity Mobile Management Entity (MME) of described UE, confirm to carry out X2 link switching or S1 link switching.
In 401, when source base station with serve while setting up S1 link connection between the MME group of source base station, source base station can obtain MME Group ID and the MME Code of the MME in above-mentioned MME group.In the time that UE prepares access source base station, source base station is selected resident EPC according to the user profile of UE, and according to cell load balance, for UE selects the suitable MME in the MME group in EPC, allows UE be resided in above-mentioned MME.Now, source base station can obtain the MME Code that serves source base station and the resident MME of UE.
In 402, in the time that described source base station and described target BS connect, described source base station receives that X2 link connection that described target BS sends is set up request message (X2 Setup Request) or X2 link connection is set up response message (X2 Setup Response), and described X2 link connection sets up request message or described X2 link connection is set up the MME Code set that response message can comprise the MME group that serves described target BS.It will be appreciated by those skilled in the art that, in the process that source base station and target BS connect, in the time that first source base station initiates to connect demand, source base station sends X2 link connection to target BS and sets up request message, target BS sends X2 link connection to source base station and sets up response message, to confirm connection.In the time that first target BS initiates to connect demand, target BS sends X2 link connection to source base station and sets up request message, and source base station sends X2 link connection to target BS and sets up response message, to confirm connection.
When needing to reconfigure between described source base station and described target BS while being connected, described source base station receives configuration update message (Configuration Update) or the config update acknowledge message (Configuration Update Acknowledge) that described target BS sends, and described configuration update message or described config update acknowledge message can comprise the MME Code set of the MME group that serves described target BS.For example, after connecting between source base station and target BS, in the time that the relevant information of source base station or target BS changes (while changing as the number of cells under source base station or target BS), corresponding renewal is done in notice base station, opposite end.It will be appreciated by those skilled in the art that, in the process that source base station and target BS connect, in the time that first source base station initiates to reconfigure demand, source base station sends configuration update message to target BS, target BS sends config update acknowledge message to source base station, to confirm to reshuffle connection.In the time that first target BS initiates to reconfigure demand, target BS sends configuration update message to source base station, and source base station sends config update acknowledge message to target BS, to confirm to reshuffle connection.
403 of the present embodiment can, with reference to the associated description in a upper embodiment 301, not repeat them here.
In 404, whether the MMECode that described source base station and the resident MME of described UE are served in source base station judgement is identical with the MME Code in described MME Code set, and the X2 carrying out between source base station and target BS according to judged result switches or S1 switching.For example, in the time that the MME Code that serves the resident MME of described source base station and described UE is identical with a MME Code in described MME Code set, source base station determine target BS and serve described source base station and MME that described UE is resident between S1 link good for use, without carrying out the redirected mobile management of EPC, source base station and described target BS carry out X2 link switching.And for example, when the described MME Code of described source base station and the resident MME of described UE and any MME Code in described MME Code set of serving is when all identical, source base station determine target BS and serve described source base station and MME that described UE is resident between S1 link extremely unavailable, need to carry out the redirected mobile management of EPC, described source base station and described target BS carry out S1 link switching.
Therefore, S1 link-state information between the target BS that the present embodiment can send to source base station according to target BS and the MME that serves target BS, indicate described target BS and serve described source base station and MME that described UE is resident between S1 link whether normal, carry out S1 link switching or X2 link switching with judgement source base station and target BS, successfully carry out the switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides the changing method between a kind of base station, as shown in Figure 4, comprising:
501: the first base stations send a MME key (the being called for short MME Code) set of the MME group that serves described the first base station to the second base station, the S1 link between MME and described first base station of the MME Code representative in a described MME Code set is normal.
502: described the first base station receives the 2nd MME Code set of the MME group that serves described the second base station of described the second base station transmission, the S1 link between MME and described second base station of the MME Code representative in described the 2nd MME Code set is normal.
503: in the time that the first base station/the second base station sends handover request message to the second base station/the first base station, described the first base station/the second base station according to described the second base station/the first base station, and serve the S1 link-state information between described the first base station/the second base station and the resident mobile management entity Mobile Management Entity (MME) of described UE, confirm to carry out X2 link switching or S1 link switching.
In 501,502, the first base station obtains method that a MME Code set and the second base station obtain the 2nd MME Code set and can, with reference to 401 associated description in a upper embodiment, not repeat them here.
503, in the time that the first base station/the second base station has respectively a MME Code and the 2nd MMECode, no matter which base station UE will reside in, and the resident base station of above-mentioned UE all can, in the time initiating handover request, obtain the S1 link-state information between the resident MME of base station, opposite end and UE.
For example, in the time that UE resides in the first base station, the first base station can obtain by a MME Code set MME Code of the resident MME of UE.Meanwhile, the first base station receives the 2nd MME Code set that the second base station sends.In the time that the first base station sends handover request message to the second base station, whether the MME Code that the resident MME of described UE is compared in the first base station is identical with the MME Code in described the 2nd MME Code set.Identical, described the first base station learn described the second base station and serve described the first base station and MME that described UE is resident between S1 link normal, carry out X2 link switching.Difference, described the first base station learn described the second base station and serve described the first base station and MME that described UE is resident between S1 link abnormal, carry out S1 link switching.
And for example, in the time that UE resides in the second base station, the second base station can obtain by the 2nd MME Code set the MME Code of the resident MME of UE.Meanwhile, the second base station receives the MME Code that the first base station sends.In the time that the second base station sends handover request message to the first base station, whether the MME Code that the resident MME of described UE is compared in the second base station is identical with the MME Code in a described MME Code set.Identical, described the second base station learn described the first base station and serve described the second base station and MME that described UE is resident between S1 link normal, carry out X2 link switching.Difference, described the second base station learn described the first base station and serve described the second base station and MME that described UE is resident between S1 link abnormal, carry out S1 link switching.
Those skilled in the art will appreciate that in the present embodiment, first base station/the second base station of initiating handover request message is source base station, and the first base station/the second base station that receives handover request is target BS.
Therefore, S1 link-state information between the target BS that the present embodiment can send to source base station according to target BS and the MME that serves target BS, indicate described target BS and serve described source base station and MME that described UE is resident between S1 link whether normal, carry out S1 link switching or X2 link switching with judgement source base station and target BS, successfully carry out the switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides the changing method between a kind of base station, as shown in Figure 5, comprising:
601: the handover request message that target BS reception sources base station sends, for described source base station being provided the subscriber equipment User Equipment (UE) of service switch to described target BS Xia community.
602: described target BS sends described target BS, and serves the S1 link-state information between described source base station and the resident mobile management entity Mobile Management Entity (MME) of described UE to described source base station, confirms to carry out X2 link switching or S1 link switching for described source base station.
601 and 602 of the present embodiment can, with reference to the associated description in the changing method between above-mentioned other embodiment base stations, not repeat them here.
Therefore, the target BS that the present embodiment can send to source base station according to target BS and serve source base station and MME that UE is resident between S1 link-state information, indicate described target BS and serve described source base station and MME that described UE is resident between S1 link whether normal, carry out S1 link switching or X2 link switching with judgement source base station and target BS, successfully carry out the switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
It will be appreciated by those skilled in the art that all or part of flow process that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, said procedure, in the time carrying out, is carried out the flow process that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Another embodiment of the present invention provides a kind of base station, and its primary structure can, with reference to shown in figure 6, comprise:
Transmitting element 701, for sending handover request message to target BS, to provide the subscriber equipment User Equipment (UE) of service to switch in described target BS Xia community described base station;
Processing unit 702, for according to described target BS, with the S1 link-state information of serving between described base station and the resident mobile management entity Mobile Management Entity (MME) of described UE, X2 link switching or S1 link switching are carried out in confirmation.
Wherein, described base station also comprises confirmation unit, normal for confirming that the MME group that serves the MME group of described base station and serve described target BS has X2 link between identical MME group identification MMEGroup ID and described base station and described target BS, so that described base station and described target BS carry out X2 link switching.
Wherein, described base station also comprises the first receiving element, for receive the described target BS that described target BS sends and serve described base station and MME that described UE is resident between S1 link-state information, with the described target BS of box lunch and serve described base station and MME that described UE is resident between S1 link-state information indicate described target BS and serve described base station and MME that described UE is resident between S1 link when abnormal, X2 link switching between the termination of described base station and described target BS, then carry out S1 link switching.
Wherein, described the first receiving element, also prepares failed message for receiving the switching that described target BS sends, described switching prepare failed message comprise described target BS and serve described base station and MME that described UE is resident between S1 link-state information.
Wherein, described base station also comprises acquiring unit, for obtaining the MME key MME Code that serves described base station and the resident MME of described UE; And second receiving element, for receiving the MME Code set of the MME group that serves described target BS that described target BS sends, the S1 link between MME and the described target BS of the MME Code representative in described MME Code set is normal.
Wherein, described base station also comprises judging unit, for when described in serve a MME Code that the MME Code of described base station and the resident MME of described UE gathers with described MME Code when identical, judge described target BS and serve described base station and MME that described UE is resident between S1 link normal, described base station and described target BS carry out X2 link switching; And when described in serve the MME Code of described base station and the resident MME of described UE and any MME Code in described MME Code set when all identical, judge described target BS and serve described base station and MME that described UE is resident between S1 link abnormal, described base station and described target BS carry out S1 link switching.
Wherein, described the second receiving element, also in the time that described base station and described target BS connect, request message or connection establishment response message are set up in the connection that receives described target BS transmission, and request message is set up in described connection or described connection establishment response message comprises that the MME Code of the MME group that serves described target BS gathers.
Wherein, described the second receiving element, also for when needing to reconfigure between described base station and described target BS while being connected, described base station receives configuration update message or the config update acknowledge message that described target BS sends, and described configuration update message or described config update acknowledge message comprise the MME Code set of the MME group that serves described target BS.
The base station of the present embodiment, for realizing the performed action of source base station of the changing method between above-mentioned base station.For example, above-mentioned transmitting element 701 is for carrying out the action of the changing method 301 between an embodiment base station, and above-mentioned processing unit 702 is for carrying out the action of the changing method 302 between an embodiment base station.
Therefore, the target BS that the present embodiment can send to source base station according to target BS and serve source base station and MME that UE is resident between S1 link-state information, indicate described target BS and serve described source base station and MME that described UE is resident between S1 link whether normal, carry out S1 link switching or X2 link switching with judgement source base station and target BS, successfully carry out the switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides a kind of base station, and its primary structure can, with reference to shown in figure 7, comprise:
Receiving element 801, the handover request message sending for reception sources base station, to provide the subscriber equipment User Equipment (UE) of service to switch in Xia community, described base station described source base station;
Transmitting element 802, for send to described source base station described base station, with the S1 link-state information of serving between described source base station and the resident mobile management entity Mobile Management Entity (MME) of described UE so that X2 link switching or S1 link switching are carried out in the confirmation of described source base station.
Wherein, described base station also comprises indicating member, for via described base station and serve described source base station and MME that described UE is resident between S1 link-state information to described source base station indicate described base station, and to serve S1 link between described source base station and the resident MME of described UE abnormal, for the X2 link switching between described source base station termination and described base station, then carry out S1 link switching.
Wherein, described transmitting element 802, also prepares failed message for sending to described source base station to switch, described switching prepare failed message comprise described base station and serve described source base station and MME that described UE is resident between S1 link-state information.
Wherein, described transmitting element 802, also, for send the MME Code set of the MME group that serves described base station to described source base station, the S1 link between MME and the described base station of the MME Code representative in described MME Code set is normal.
The base station of the present embodiment, for realizing the performed action of target BS of the changing method between other embodiment base stations.For example, above-mentioned receiving element 801 can be for carrying out the action of 601 in an embodiment, and above-mentioned transmitting element 802 can be for carrying out the action of 602 in an embodiment.
Therefore, the target BS that the present embodiment can send to source base station according to target BS and serve source base station and MME that UE is resident between S1 link-state information, indicate described target BS and serve described source base station and MME that described UE is resident between S1 link whether normal, carry out S1 link switching or X2 link switching with judgement source base station and target BS, successfully carry out the switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides a kind of communication system, and its primary structure comprises:
One source base station and a target BS;
Described source base station, for sending handover request message to target BS, to provide the subscriber equipment User Equipment (UE) of service to switch in described target BS Xia community described base station; And according to described target BS, and serve the S1 link-state information between described source base station and the resident mobile management entity Mobile Management Entity (MME) of described UE, carry out X2 link switching or S1 link switching;
Described target BS, the handover request message sending for reception sources base station; And send described target BS, and serve the S1 link-state information between described source base station and the resident MME of described UE to described source base station.
Therefore, the target BS that the present embodiment can send to source base station according to target BS and serve source base station and MME that UE is resident between S1 link-state information, indicate described target BS and serve described source base station and MME that described UE is resident between S1 link whether normal, carry out S1 link switching or X2 link switching with judgement source base station and target BS, successfully carry out the switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
One embodiment of the invention provides the changing method between a kind of base station, comprising:
31: the X2 link switching request message that target BS reception sources base station sends, for described source base station being provided the subscriber equipment User Equipment (UE) of service switch to described target BS Xia community.
32: described target BS via first mobile management entity Mobility Management Entity (MME) Connection Service of serving described target BS in described source base station and the 2nd resident MME of described UE.
33: described target BS and described source base station carry out X2 link switching.
In 31, when the MME group that described source base station is confirmed to serve the MME group of described source base station and served described target BS has X2 link between identical MME group identification (being called for short MME Group ID) and described source base station and described target BS when normal, described source base station is to described target BS transmission X2 link switching request message.Now, source base station default sources base station and target BS provide service by same MME, and X2 link can use, therefore, switching between source base station and target BS, without the S1 link through MME, can directly be completed and be switched action by the X2 link between source base station and target BS.
In the present embodiment, can MME of unique identification by two identifiers, above-mentioned identifier is respectively MME Group ID and MME key (being called for short MME Code).Source base station can be by self obtaining the MME Group ID that the MME group of service is provided to it.For example, in the time that source base station is set up S1 link connection with the MME group that serves source base station, source base station can obtain the MME Group ID of the MME group that serves source base station.And, provide each MME in the MME group of service to there is identical MME Group ID to source base station, and different MME Code.Equally, target BS also can be by self obtaining the MME Group ID that the MME group of service is provided to it.And, provide each MME in the MME group of service to there is identical MME Group ID to target BS, and different MME Code.
In the present embodiment, source base station can learn that whether the X2 link between source base station and target BS is normal by dominant mode or stealthy mode.For example, dominant mode is that source base station can obtain by the status indicator of source base station side the state of X2 link.Above-mentioned status indicator represents respectively three kinds of states of X2 link, comprising: disconnection, busy and normal.For example, in the time that status indicator is disconnection by the status indication of X2 link, represent that the physical layer of the X2 link between source base station and target BS does not also configure, X2 link is unavailable.And for example, when status indicator is while being busy by the status indication of X2 link, represent that the physical layer of the X2 link between source base station and target BS is connected, but cannot transmit data via X2 link, X2 link is unavailable.For another example, when status indicator is while being normal by the status indication of X2 link, represent that the physical layer of the X2 link between source base station and target BS is connected, and can transmit data via X2 link, X2 link is good for use.And for example, stealthy mode is that (opposite end of source base station is target BS, and same, the opposite end of target BS is source base station to opposite end for source base station or target BS.) transmit data, if opposite end receives above-mentioned data, show that the X2 link between source base station and target BS is good for use.Those skilled in the art will appreciate that by additive method and also can learn that whether the X2 link between source base station and target BS is normal, do not repeat them here.
In 32, when described target BS and serve described source base station and the 2nd MME that described UE is resident between S1 Link State when abnormal, described target BS connects described the 2nd MME via a MME.
In the present embodiment, because UE resides in the 2nd MME, therefore target BS need to obtain after the user profile of UE from the 2nd MME, just can complete normal X2 link switching between source base station and target BS.And in the time that the S1 Link State between target BS and the 2nd MME is abnormal, between target BS and the 2nd MME, cannot carry out normal data communication, target BS cannot directly obtain the user profile of UE from the 2nd MME.Between the one MME and the 2nd MME, connect, refer between a MME and the 2nd MME and can set up being connected of S10 link by S10 interface.By normal S1 Link State between target BS and a MME, and normal S10 Link State between a MME and the 2nd MME, described target BS can obtain indirectly by a MME user profile of the described UE in the 2nd MME.
In the present embodiment, the user profile of above-mentioned UE can be the fail safe context relevant to UE, roaming restriction, UE ability information etc.
In 33, the user profile of carrying UE in the path switch acknowledgment message that the one MME sends to target BS, subsequently, target BS sends and discharges UE context message to source base station, notification source base station X2 link switching completes smoothly, can discharge the resource originally taking.
Therefore, the present embodiment can target BS and serve source base station and MME that UE is resident between S1 Link State when abnormal, indirectly obtain the user profile of UE, successfully carry out the X2 link switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides the changing method between a kind of base station, comprising:
41: source base station sends X2 link switching request message to target BS, for described source base station being provided the subscriber equipment User Equipment (UE) of service switch to described target BS Xia community.
42: when serving S1 link between source base station and UE resident the 2nd MME and described target BS when abnormal, described target BS sends the instruction of the user profile of obtaining described UE to a MME who serves described target BS.
43: between a described MME and described the 2nd MME, connect.
44: the instruction of the user profile of obtaining described UE is sent to described the 2nd MME by a described MME.
45: described the 2nd MME sends the user profile of described UE to a described MME.
46: described target BS receives the user profile of the described UE of a described MME forwarding.
47: described target BS sends and discharges UE context message to described source base station, for completing the X2 link switching between source base station and target BS.
41 of the present embodiment can, with reference to the associated description of a upper embodiment 31, not repeat them here.
In 42 and 43, when target BS with serve while setting up S1 link connection between the MME group of target BS, target BS can obtain the MME Group ID of the MME in above-mentioned MME group.Equally, when source base station with serve while setting up S1 link connection between the MME group of source base station, source base station also can obtain the MME Group ID of the MME in above-mentioned MME group.In the time that UE prepares access source base station, source base station is selected resident EPC according to the user profile of UE, and according to cell load balance, for UE selects the suitable MME in the MME group in EPC, allows UE be resided in above-mentioned MME.Now, source base station can obtain the MME Group ID that serves source base station and the resident MME of UE.
In the present embodiment, in the time that a MME and the 2nd MME are positioned at same MME group, a MME has identical MME Group ID with the 2nd MME.In the time that target BS is found the 2nd MME but cannot be carried out data communication with it by identical MME Group ID in MME group, target BS can find by identical MME Group ID a MME who is applicable to carrying out with it data communication equally in above-mentioned MME group, and by normal S10 link between a MME and the 2nd MME, indirectly obtain the user profile of the UE in a MME.
In the present embodiment, described target BS can transmit path handover request message (Path Switch Request) to a described MME, the instruction of obtaining the user profile of described UE described in described path handoff request message contains.
In 44, a MME is to the 2nd MME transmit path handover request message, the instruction of obtaining the user profile of described UE described in described path handover request message carries.
In 45, because UE itself just resides in the 2nd MME, therefore the 2nd MME can be by self obtaining the user profile of UE, and the user profile of above-mentioned UE is sent to a MME by S10 link.
In the present embodiment, described the 2nd MME is to a described MME transmit path switch acknowledgment message, the user profile that described path switch acknowledgment message comprises described UE.
In 46, target BS receives the path switch acknowledgment message that a MME forwards, the user profile that described path switch acknowledgment message comprises described UE.
Therefore, the present embodiment can target BS and serve source base station and MME that UE is resident between S1 Link State when abnormal, indirectly obtain the user profile of UE, successfully carry out the X2 link switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides the changing method between a kind of base station, comprising:
51: serve the 2nd resident MME Connection Service of source base station and UE in a MME of target BS.
52: described the 2nd MME connects described target BS via a described MME, in order in the time that described source base station sends X2 link switching request message to described target BS, described target BS and described source base station carry out X2 link switching.
51 and 52 of the present embodiment can, with reference to the associated description in the changing method between above-mentioned other embodiment base stations, not repeat them here.
Therefore, the present embodiment can target BS and serve source base station and MME that UE is resident between S1 Link State when abnormal, indirectly obtain the user profile of UE, successfully carry out the X2 link switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides a kind of base station, comprising:
Receiving element 61, the X2 link switching request message sending for reception sources base station, to provide the subscriber equipment User Equipment (UE) of service to switch in Xia community, described base station described source base station;
Linkage unit 62, for the MME Connection Service via serving described base station in described source base station and the 2nd resident MME of described UE; And
Switch unit, for carrying out X2 link switching with described source base station.
The base station of the present embodiment, for realizing the performed action of target BS of the changing method between above-mentioned base station.For example, above-mentioned receiving element 61 is for carrying out the action of the changing method 31 between an embodiment base station, and above-mentioned linkage unit 62 is for carrying out the action of the changing method 32 between an embodiment base station.
Therefore, the present embodiment can target BS and serve source base station and MME that UE is resident between S1 Link State when abnormal, indirectly obtain the user profile of UE, successfully carry out the X2 link switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides a kind of mobile management entity MME, comprising:
Linkage unit 71, for Connection Service in a MME of target BS and serve source base station and MME that described UE is resident, so that described MME connects described target BS via a described MME, in order in the time that described source base station sends X2 link switching request message to described target BS, described target BS and described source base station carry out X2 link switching.
The mobile management entity of the present embodiment, serves source base station and the resident performed action of the 2nd MME of UE for what realize changing method between above-described embodiment base station.For example, above-mentioned linkage unit 71 can be for carrying out the action of 51 in an embodiment.
Therefore, the present embodiment can target BS and serve source base station and MME that UE is resident between S1 Link State when abnormal, indirectly obtain the user profile of UE, successfully carry out the X2 link switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
Another embodiment of the present invention provides a kind of Element management system, comprising:
One MME and who serves target BS serves source base station and the 2nd resident MME of described UE;
A described MME, for connecting described the 2nd MME;
Described the 2nd MME, be used for connecting a described MME, so that described the 2nd MME connects described target BS via a described MME, in order in the time that described source base station sends X2 link switching request message to described target BS, described target BS and described source base station carry out X2 link switching.
Therefore, the present embodiment can target BS and serve source base station and MME that UE is resident between S1 Link State when abnormal, indirectly obtain the user profile of UE, successfully carry out the X2 link switching of source base station to target BS, realize UE and switch to target BS Xia community from source base station Xia community.
In the several embodiment that provide in the application, should be understood that, disclosed system, apparatus and method, can realize by another way.For example, device embodiment described above is only schematic, for example, the division of described unit, be only that a kind of logic function is divided, when actual realization, can have other dividing mode, for example multiple unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically, machinery or other form.
The described unit as separating component explanation can or can not be also physically to separate, and the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in multiple network element.Can select according to the actual needs some or all of unit wherein to realize the object of the present embodiment scheme.
In addition, the each functional unit in each embodiment of the present invention can be integrated in a processing unit, can be also that the independent physics of unit exists, and also can be integrated in a unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, and also can adopt the form of SFU software functional unit to realize.
If described integrated unit is realized and during as production marketing independently or use, can be stored in a computer read/write memory medium using the form of SFU software functional unit.Based on such understanding, the all or part of of the part that technical scheme of the present invention contributes to prior art in essence in other words or this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions (can be personal computers in order to make a computer equipment, server, or the network equipment etc.) carry out all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), the various media that can be program code stored such as random access memory (RAM, Random Access Memory), magnetic disc or CD.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into multiple submodules.
It will be understood by those skilled in the art that in the embodiment of the present invention, the function that is divided into of apparatus module is divided, actual concrete structure can be fractionation or the merging of above-mentioned functions module.
The sequence number of above embodiment, just to describing, does not represent the quality of embodiment.
The scheme that the content of claim is recorded is also the protection range of the embodiment of the present invention.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (5)

1. the changing method between base station, is characterized in that, comprising:
The X2 handover request message that target BS reception sources base station sends, for providing the user equipment (UE) of service to switch to described target BS described source base station;
When serving S1 link between described source base station and described UE resident the second Mobility Management Entity MME and described target BS when abnormal, described target BS sends the instruction of the user profile of obtaining described UE to a MME who serves described target BS, between a described MME and described the 2nd MME, connect, the instruction of the described user profile of obtaining described UE is sent to described the 2nd MME by a described MME, described the 2nd MME sends the user profile of described UE to a described MME, a described MME and described the 2nd MME are positioned at the same MME GROUP of group,
Described target BS receives the user profile of the described UE of a described MME forwarding;
Described target BS, according to the user profile of described UE, sends and discharges UE context message to described source base station, completes the X2 link switching between described source base station and described target BS.
2. the method for claim 1, is characterized in that:
A described MME and described the 2nd MME have identical MME GROUP mark.
3. method as claimed in claim 1 or 2, is characterized in that, described target BS receives the user profile of the described UE of a described MME forwarding, comprising:
Described target BS receives the path switch acknowledgment message that a described MME forwards, the user profile that described path switch acknowledgment message comprises described UE.
4. a base station, is characterized in that, comprises receiving element and transmitting element:
Described receiving element, for:
The X2 handover request message that reception sources base station sends, for providing the user equipment (UE) of service to switch to described base station described source base station;
Receive the user profile of the described UE of the first Mobility Management Entity MME forwarding;
Described transmitting element, for:
When serving S1 link between described source base station and described UE resident the 2nd MME and described base station when abnormal, transmission is obtained the instruction of user profile of described UE to a MME who serves described base station, between a described MME and described the 2nd MME, connect, the instruction of the described user profile of obtaining described UE is sent to described the 2nd MME by a described MME, described the 2nd MME sends the user profile of described UE to a described MME, and a described MME and described the 2nd MME are positioned at the same MME GROUP of group;
According to the user profile of described UE, send and discharge UE context message to described source base station, complete the X2 link switching between described source base station and described base station.
5. base station as claimed in claim 4, is characterized in that, also comprises:
A described MME and described the 2nd MME have identical MME GROUP mark.
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