CN103874046A - Process message management method and device - Google Patents
Process message management method and device Download PDFInfo
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- CN103874046A CN103874046A CN201210540420.XA CN201210540420A CN103874046A CN 103874046 A CN103874046 A CN 103874046A CN 201210540420 A CN201210540420 A CN 201210540420A CN 103874046 A CN103874046 A CN 103874046A
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Abstract
The invention discloses a process message management method and device, used for solving the problem of prior art that each Local eNB is in direct connection with an MME/SGW, which is easy to cause heavier load of the MME/SGW. The process message management method in the embodiment of the invention comprises: the Macro eNB to which a small cell belongs receiving process message transmitted by the small cell, wherein the process message carries the ECGI (E-UTRAN Cell Global Identity) of the small cell, and the cell identity in the ECGI of the small cell is composed of the identity of the Macro eNB to which the small cell belongs and a local cell identity; and performing corresponding treatment on the process message in dependence on the type of the received process message. The method in the embodiment of the invention effectively solves the problem of signaling/ data routing under the conditions of small cell dense deployment and wireless backhaul between a Local eNB and a Macro eNB.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of management method of process message and equipment.
Background technology
The network architecture of the universal land radio access web (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) of evolution is shown in Figure 1, and E-UTRAN is by eNB(evolution base station) form.
Between Mobility Management Entity (Mobility Management Entity, MME) and eNB, adopt S1-MME interface to be connected; ENB completes Access Network function, passes through idle port communication with subscriber equipment (User Equipment, UE).The UE that is attached to network for each, has a MME to provide service for it, and this MME is called the serving MME of this UE.S1-MME interface, for UE provides chain of command service, comprises mobile management and bearer management function.
Between gateway (Serving GW, S-GW) and eNB, adopt S1-U interface to be connected, the UE that is attached to network for each, has a S-GW to provide service for it, and this S-GW is called the service S-GW of this UE.S1-U interface provides the service of user's face for UE, and the user face data of UE is by S1-UGTP(GTP, GPRS Tunneling Protocol, GPRS Tunnel Protocol; GPRS, General Packet Radio Service, GPRS) be carried between S-GW and eNB and transmit.
The existing Local eNB(home base stations that comprises) and Macro eNB(macro base station) the framework of hierarchical network shown in Figure 2, Macro cell(macrocell, be the community that Macro eNB controls) provide basis to cover, Local cell(home cell, be the community that Local eNB controls) provide focus to cover, between Local Cell and Macro Cell, have data/signaling interface (wire/wireless interface), UE can be operated under Macro eNB or Local eNB.
Community (being Local Cell) the coverage UE little, service controlling due to Local eNB is few, so the UE that is connected to Local eNB often can obtain better service quality, as: obtain higher service rate, higher-quality link.Therefore,, in the time being connected to the UE of Macro eNB and approaching the community that Local eNB controls, can be switched to the service that Local eNB provides to obtain Local eNB; When UE away from Local eNB control community time, need to be switched to Macro eNB control community, to keep wireless connections.
Small Cell(small-cell under Local eNB) E-UTRAN community overall identification (E-UTRAN Cell Global Identity, consisting of ECGI): PLMN ID(Public Land Mobile Network Identity, Public Land Mobile Nerwork)+Cell Identity(cell ID), wherein, Cell Identity is 28 bits (bit), its Local eNB ID(home base stations by 20bit identifies) and this cell ID of Small Cell ID(of 8bit) form, therefore, Local eNB needs to keep direct with MME/SGW and is connected.
Under above-mentioned heterogeneous network (HetNet) deployment scenario, because the coverage of Local Cell is little, therefore, need to dispose a large amount of Local eNB, to meet the demand of more UE.Because the cell ID (Cell Identity) of the Small Cell under Local eNB is made up of Local eNB ID and local district identification, each Local eNB keeps being directly connected with MME/SGW, make packet be routed directly to gateway by IP network, this just needs to adopt wired connection mode between Local eNB and SGW, easily causes the signaling traffic load of core net heavier.
Summary of the invention
The embodiment of the present invention provides a kind of management method and equipment of process message, for solve that prior art exists because each Local eNB and MME/SGW keep being directly connected, easily cause the heavier problem of signaling traffic load of core net.
The embodiment of the present invention provides a kind of method of processing procedure message, and the method comprises:
The macro base station of small-cell ownership receives the process message that described small-cell sends, and carries the E-UTRAN community overall identification ECGI of described small-cell in described process message;
Described macro base station, according to the type of described process message, is processed accordingly to described process message;
Wherein, the cell ID in the ECGI of described small-cell is made up of mark and the local district identification of described macro base station; The S1-C interface of described small-cell is connected to Mobility Management Entity MME by described macro base station, and the X2-C interface of described small-cell is connected to other nodes except self by described macro base station.
The embodiment of the present invention provides a kind of method of process of transmitting message, and the method comprises:
Small-cell is identified for carrying the interface connection of process message to be sent, carries the E-UTRAN community overall identification ECGI of self in described process message;
Described small-cell is connected to the macro base station of self ownership and is sent described process message by definite interface;
Wherein, the cell ID in the ECGI of described small-cell is made up of mark and the local district identification of described macro base station; The S1-C interface of described small-cell is connected to Mobility Management Entity MME by described macro base station, and the X2-C interface of described small-cell is connected to other nodes except self by described macro base station.
The embodiment of the present invention provides a kind of network equipment of processing procedure message, comprising:
Receiver module, the process message sending for receiving small-cell, carries the E-UTRAN community overall identification ECGI of described small-cell in described process message;
Processing module, for according to the type of described process message, processes accordingly to described process message;
Wherein, the cell ID in the ECGI of described small-cell is made up of mark and the local district identification of described macro base station; The S1-C interface of described small-cell is connected to Mobility Management Entity MME by described macro base station, and the X2-C interface of described small-cell is connected to other nodes except self by described macro base station.
The embodiment of the present invention provides a kind of network equipment of process of transmitting message, comprising:
Determination module, for being identified for carrying the interface connection of process message to be sent, carries the E-UTRAN community overall identification ECGI of self in described process message;
Sending module, connects to the macro base station of self ownership and sends described process message for the interface by definite;
Wherein, the cell ID in the ECGI of described small-cell is made up of mark and the local district identification of described macro base station; The S1-C interface of described small-cell is connected to Mobility Management Entity MME by described macro base station, and the X2-C interface of described small-cell is connected to other nodes except self by described macro base station.
Cell ID in the ECGI of the small-cell of the embodiment of the present invention is made up of mark and the local district identification of the macro base station of its ownership; And the S1-C interface of this small-cell is connected to MME by macro base station, its X2-C interface is connected to other nodes except self by macro base station; The macro base station of this small-cell ownership is receiving after the process message of small-cell transmission, according to the type of this process message, this process message is processed accordingly, under the intensive deployment scenario in small-cell and between Local eNB and Macro eNB, adopted the signaling/data routing issue in wireless backhaul situation thereby solved.
Accompanying drawing explanation
Fig. 1 is the network architecture schematic diagram of the universal land radio access web of evolution in prior art;
Fig. 2 is the configuration diagram of hierarchical network in prior art;
Fig. 3 is the network architecture schematic diagram that in the embodiment of the present invention, chain of command/user face separates;
Fig. 4 is the method flow diagram of embodiment of the present invention processing procedure message;
Fig. 5 is the method flow diagram of embodiment of the present invention process of transmitting message;
Fig. 6 is the interaction flow schematic diagram between Macro cell and Small Cell in the S1Setup process of embodiment of the present invention Standalone Small Cell;
Fig. 7 is the interaction flow schematic diagram between Macro cell and Small Cell in the E-RAB process of establishing of embodiment of the present invention Standalone Small Cell;
Fig. 8 is the interaction flow schematic diagram between Macro cell and Small Cell in the eNB config update process of establishing of embodiment of the present invention Standalone Small Cell;
Fig. 9 is the interaction flow schematic diagram between Macro cell and Small Cell in the X2 handoff procedure of embodiment of the present invention Standalone Small Cell;
Figure 10 is the interaction flow schematic diagram between Macro cell and Small Cell in the ANR process of embodiment of the present invention Standalone Small Cell;
Figure 11 is the structural representation of the network equipment of embodiment of the present invention processing procedure message;
Figure 12 is the structural representation of the network equipment of embodiment of the present invention process of transmitting message.
Embodiment
Cell ID in the ECGI of the small-cell of the embodiment of the present invention is made up of mark and the local district identification of the macro base station of its ownership; And the S1-C interface of this small-cell is connected to MME by macro base station, its X2-C interface is connected to other nodes except self by macro base station; The macro base station of this small-cell ownership receives after the process message of small-cell transmission, according to the type of this process message, this process message is processed accordingly, under the intensive deployment scenario in small-cell and between Local eNB and Macro eNB, adopted the signaling/data routing issue in wireless backhaul situation thereby solved.
In order to optimize the handoff functionality of UE between the macrocell (being Macro Cell) of Macro eNB control and the home cell (being Local Cell) of Local eNB control, introduce chain of command/user face isolation technics, its network architecture is shown in Figure 3, under this network architecture, the signaling of UE is connected all and is connected to MME/SGW by Macro eNB with user's face.The embodiment of the present invention has proposed a kind of Small Cell that supports chain of command/user face to separate and has been connected with the logic of core net (MME/SGW) or other nodes (other eNB) and the technical scheme of signaling/data route.
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
Shown in Figure 4, the method for a kind of processing procedure message that the embodiment of the present invention provides, comprising:
The macro base station of step 41, small-cell ownership receives the process message that this small-cell sends, and carries the ECGI of small-cell in this process message;
Wherein, the cell ID (28bit) in the ECGI of small-cell is made up of mark (20bit) and the local district identification (8bit) of macro base station, thereby makes this Small Cell indirectly be connected to core net or other nodes by Macro eNB; And the S1-C interface of this small-cell is connected to MME by macro base station, the X2-C interface of small-cell is connected to other nodes except self by macro base station.
Further, if the small-cell of the embodiment of the present invention is the small-cell that works alone (Standalone Small Cell), the S1-U interface of this small-cell can be connected to SGW by macro base station, also can be directly connected to SGW; Equally, the X2-U interface of this small-cell can be connected to other nodes by macro base station, also can be directly connected to other nodes;
Wherein, Standalone Small Cell refers to the small-cell with complete function, supports the resident of UE and access;
These other nodes can be other home base stations, can be also the nodes such as the home cell of other home base stations controls.
Further, if the small-cell of the embodiment of the present invention is dependent work small-cell (Non Standalone Small Cell), the S1-U interface of this small-cell is connected to gateway SGW by macro base station; The X2-U interface of this small-cell is connected to other nodes except self by macro base station;
Wherein, Non Standalone Small Cell refers to the small-cell without complete function, does not support the resident of UE and access.
In the embodiment of the present invention, process message comprises dedicated process message (i.e. the process message relevant to UE) and public procedure message (with the irrelevant process message of UE).
Further, the dedicated process message of S1 interface bearing includes but not limited to following message:
Evolved Packet System RAB (EPS(Evolved Packet System) Radio Access Bearer, E-RAB) message that management process is relevant, the message that message, the handoff procedure that UE context management process is relevant is relevant, message and the relevant message of position fixing process that Non-Access Stratum (Non Access Stratum, NAS) transmitting procedure is relevant;
The public procedure message of S1 interface bearing comprises: relevant relevant message and overload (Over Load) message that process is relevant of message, base station configuration updating (the eNB CONFIGURATION UPDATE) message that process is relevant, MME config update (MME CONFIGURATION UPDATE) process of message, reseting procedure that S1 process of establishing is relevant.
Further, the dedicated process message of X2 interface carrying comprises: the message that X2 handoff procedure is relevant;
The public procedure message of X2 interface carrying comprises: relevant relevant message and resource status report (Resource Status Report) message that process is relevant of message, base station configuration updating (eNB CONFIGURATION UPDATE) message, community activation that process is relevant of message, reseting procedure that X2 process of establishing is relevant.
Further, in step 42, macro base station, according to the type of the process message receiving, is processed accordingly to this process message, comprises following four kinds of situations:
The first situation: if the process message receiving in step 41 is the dedicated process message of S1 interface bearing, macro base station carries out corresponding processing to this process message and further comprises:
Macro base station is receiving after this process message, by S1 Application Protocol (the S1-Application Protocol between the small-cell and the macro base station that carry in this process message, S1-AP) mark is revised as the S1-AP ID between macro base station and MME, and amended process message is sent to MME.
In this situation, if the S1-U interface of small-cell is connected to SGW by macro base station, in step 42, before amended process message is sent to MME by macro base station, also comprise:
Macro base station is by self transport layer address and GPRS Tunnel Protocol (the GPRS(General Packet Radio System carrying in the process message receiving, General Packet Radio System) Tunnel Protocol, GTP) Tunnel End Point Identifier (Tunnel Endpoint Identity, TEID) is revised as respectively transport layer address and the GTP TEID of SGW.
In this situation, set up response message if the process message receiving in step 41 is E-RAB, macro base station also comprised before the E-RAB that receives small-cell transmission sets up response message:
The E-RAB that macro base station receives MME transmission sets up request message; And
The S1-AP ID that macro base station is set up E-RAB between macro base station and the MME carrying in request message is revised as the S1-AP ID between small-cell and macro base station, and amended E-RAB is set up to request message sends to small-cell;
Wherein, to set up response message be that small-cell is being set up after request message is set up interface-free resources and fed back to macro base station according to amended E-RAB to E-RAB.
Further, if the S1-U interface of small-cell is connected to SGW by macro base station, macro base station is receiving after E-RAB that MME sends sets up request message, and amended E-RAB set up before request message sends to small-cell, also comprises:
Macro base station is set up E-RAB the transport layer address of the SGW carrying in request message and GTP TEID and is revised as respectively transport layer address and the GTP TEID of self; And
Macro base station is receiving after E-RAB that small-cell sends sets up response message, and amended E-RAB set up before response message sends to MME, also comprises:
Macro base station is set up by E-RAB self transport layer address and the GTP TEID carrying in response message and is revised as respectively transport layer address and the GTP TEID of SGW.
In this situation, Marco eNB receives the S1-C interface procedure message relevant to UE that Small Cell sends, and this process message of transfer, wherein, before transfer process message, need to revise S1-AP UE ID in this process message, and if user's face (S1-U) also indirectly connect core net by Marco eNB, also need to revise transport layer address and GT TEID in this process message; Be that process that the S1-C interface of Small Cell is relevant to UE is by this Marco eNB and end at this Small Cell.
The second situation: if the process message receiving in step 41 is the public procedure message of S1 interface bearing,, in step 42, macro base station carries out corresponding processing to this process message and further comprises:
Macro base station, receiving after process message, carries out respective handling, and returns to response message to small-cell.
Further, set up request message if the public procedure message receiving in step 41 is S1, macro base station returns to response message to small-cell and further comprises:
Macro base station returns to S1 to small-cell and sets up response message, and S1 sets up and in response message, carries global unique MME mark (Globally Unique MME Identity, GUMMEI) information.
In this situation, Marco eNB receive that Small Cell sends with the irrelevant S1-C interface procedure message of UE, carry out this locality processing, and return to response message to Small Cell; Be that the irrelevant process of the S1-C interface of Small Cell and UE ends at this Marco eNB, by local these processes of processing of this Marco eNB.
The third situation: if the process message receiving in step 41 is the dedicated process message of X2 interface carrying,, in step 42, macro base station carries out corresponding processing to this process message and further comprises:
Macro base station is receiving after process message, the X2 application protocol identification X2-AP ID between the small-cell and the macro base station that carry is revised as to the X2-AP ID between macro base station and destination node, and amended process message is sent to destination node in process message.
In this situation, if the S1-U interface of small-cell is connected to SGW by macro base station, and the process message receiving in step 41 is handover request message, and macro base station, before amended handover request message is sent to destination node, also comprises:
Self transport layer address and the GTP TEID carrying in handover request message is revised as respectively transport layer address and the GTP TEID of SGW by macro base station.
Further, if the X2-U interface of small-cell is connected to destination node by macro base station, macro base station, after amended handover request message is sent to destination node, also comprises:
The switching request acknowledgement message that macro base station receiving target node sends; And
Macro base station is revised as the transport layer address of the destination node carrying in this switching request acknowledgement message and GTP TEID respectively self transport layer address and GTP TEID, and amended switching request acknowledgement message is sent to small-cell.
In this situation, Marco eNB receives the X2-C interface procedure message relevant to UE that Small Cell sends, and this process message of transfer, wherein, before transfer process message, need to revise X2-AP UE ID in this process message, and if user's face (X2-U) also indirectly connect other base stations by Marco eNB, also need to revise transport layer address and GT TEID in this process message; Be that process that the X2-C interface of Small Cell is relevant to UE is by this Marco eNB and end at this Small Cell.
The 4th kind of situation: if the process message receiving in step 41 is the public procedure message of X2 interface carrying,, in step 42, macro base station carries out corresponding processing to this process message and further comprises:
Macro base station, receiving after process message, carries out respective handling, and returns to response message to small-cell.
In this situation, Marco eNB receive that Small Cell sends with the irrelevant X2-C interface procedure message of UE, carry out this locality processing, and return to response message to Small Cell; Be that the irrelevant process of the X2-C interface of Small Cell and UE ends at this Marco eNB, by local these processes of processing of this Marco eNB.
Based on above-described embodiment, the embodiment of the present invention also provides a kind of method of process of transmitting message, shown in Figure 5, and the method comprises the following steps:
Wherein, the cell ID (28bit) in the ECGI of small-cell is made up of mark (20bit) and the local district identification (8bit) of macro base station, thereby makes this Small Cell indirectly be connected to core net or other nodes by Macro eNB; And the S1-C interface of this small-cell is connected to MME by macro base station, the X2-C interface of small-cell is connected to other nodes except self by macro base station.
Further, if the small-cell of the embodiment of the present invention is the small-cell that works alone (Standalone Small Cell), the S1-U interface of this small-cell can be connected to SGW by macro base station, also can be directly connected to SGW; Equally, the X2-U interface of this small-cell can be connected to other nodes by macro base station, also can be directly connected to other nodes;
Wherein, Standalone Small Cell refers to the small-cell with complete function, supports the resident of UE and access;
These other nodes can be other home base stations, can be also the nodes such as the home cell of other home base stations controls.
Further, if the small-cell of the embodiment of the present invention is dependent work small-cell (Non Standalone Small Cell), the S1-U interface of this small-cell is connected to gateway SGW by macro base station; The X2-U interface of this small-cell is connected to other nodes except self by macro base station;
Wherein, Non Standalone Small Cell refers to the small-cell without complete function, does not support the resident of UE and access.
In the embodiment of the present invention, process message comprises dedicated process message and public procedure message.
Further, the dedicated process message of S1 interface bearing includes but not limited to following message:
Evolved Packet System RAB (EPS(Evolved Packet System) Radio AccessBearer, E-RAB) message that management process is relevant, the message that message, the handoff procedure that UE context management process is relevant is relevant, message and the relevant message of position fixing process that Non-Access Stratum (Non Access Stratum, NAS) transmitting procedure is relevant;
The public procedure message of S1 interface bearing comprises: relevant relevant message and overload (Over Load) message that process is relevant of message, base station configuration updating (the eNB CONFIGURATION UPDATE) message that process is relevant, MME config update (MME CONFIGURATION UPDATE) process of message, reseting procedure that S1 process of establishing is relevant.
Further, the dedicated process message of X2 interface carrying comprises: the message that X2 handoff procedure is relevant;
The public procedure message of X2 interface carrying comprises: relevant relevant message and resource status report (Resource Staus Report) message that process is relevant of message, base station configuration updating (eNB CONFIGURATION UPDATE) message, community activation that process is relevant of message, reseting procedure that X2 process of establishing is relevant.
Below in conjunction with specific embodiment to describing alternately between small-cell of the present invention (Small Cell) and macrocell (Macro Cell):
The S1Setup(S1 process of establishing of embodiment 1, the small-cell that works alone (standalone Small Cell)) process, shown in Figure 6, comprise the following steps:
Step 61, Small Cell send S1 to Macro Cell and set up request (S1 Setup Request) message;
If the eNB(under step 62 Macro Cell is Macro eNB) S1 that is not established to MME connects, and Macro Cell sends S1 as MME and sets up request, and this S1 sets up in request and comprises the information such as tracking area (Tracking Area, TA);
Further, connect if the Macro eNB under Macro Cell has been established to the S1 of MME, and there is no newly-increased TA information, perform step 64.
Further, connect, and have newly-increased TA information if the Macro eNB under Macro Cell has been established to the S1 of MME, Macro Cell sends eNB configuration update message to MME;
Accordingly, MME returns to eNB config update acknowledge message to Macro eNB receiving after this eNB configuration update message.
Step 63, MME return to S1 to Macro eNB and set up response message;
Step 64, Macro Cell set up response message by the S1 receiving and send to Small Cell, and this S1 sets up and in response message, carries Served(service) GUMMEIs information etc.
The E-RAB process of establishing of embodiment 2, Standalone Small Cell, shown in Figure 7, comprise the following steps:
Step 71, MME send E-RAB to Macro Cell and set up request (E-RAB Setup Request) message;
Step 72, Macro Cell are set up after request message receiving this E-RAB, set up MME UE S1AP ID and the eNB UE S1AP ID between macro base station and the MME that request message carries according to this E-RAB, the UE that judges access network is the UE under Small Cell, and this E-RAB is set up to MME UE S1AP ID and the eNB UE S1AP ID between macro base station and MME in request message be revised as the S1AP ID between small-cell and macro base station, and amended E-RAB is set up to request message send to Small Cell;
Wherein, MME UE S1AP ID refers in MME for the corresponding UE of unique identification S1 interface; ENB UE S1AP ID refers in same eNB, for the corresponding UE of unique identification S1 interface.
Further, if user's face (being S1-U interface) is connected to SGW by Macro Cell, Macro Cell also needs this E-RAB to set up the transport layer address (being IP address) of this SGW carrying in request message and GTP TEID and be revised as respectively transport layer address and the GTP TEID of self;
If user's face (being S1-U interface) is direct-connected to SGW, does not need that this E-RAB is set up to the transport layer address and the GTP TEID that in request message, carry and modify;
Step 73, Small Cell receive amended E-RAB and set up after request message, set up interface-free resources, and return to E-RAB to Macro Cell and set up response (E-RAB Setup Response) message;
Step 74, Macro Cell are set up after response message receiving the E-RAB that Small Cell returns, the MME UE S1AP ID/eNB UE S1AP ID this E-RAB being set up between Small Cell and the Macro cell carrying in response message is revised as the S1AP ID between Macro and MME, and amended E-RAB is set up to response message sends to MME;
Further, if user's face (being S1-U interface) is connected to SGW by Macro Cell, Macro Cell also needs that this E-RAB is set up to self transport layer address and the GTP TEID carrying in response message and is revised as respectively transport layer address and the GTP TEID of this SGW;
If user's face (being S1-U interface) is direct-connected to SGW, does not need that this E-RAB is set up to the transport layer address and the GTP TEID that in response message, carry and modify.
The eNB config update process of embodiment 3, Standalone Small Cell, shown in Figure 8, comprise the following steps:
Step 81, Small Cell send eNB config update request (eNB Configuration Update) message to Macro Cell;
Step 82, Macro Cell send to other except home base stations under this Small Cell in abutting connection with eNB the eNB config update request receiving;
Step 83, other are receiving after eNB config update request in abutting connection with eNB, return to eNB config update response (eNB Configuration Update ACK) message to Macro Cell;
Step 84, Macro Cell return to the eNB config update response message receiving to Small Cell.
The X2 handoff procedure of embodiment 4, Standalone Small Cell, shown in Figure 9, comprise the following steps:
Step 91, Small Cell determine to switch to initiating X2 in abutting connection with eNB, and Small Cell sends handover request (Handover Request) message to Macro Cell;
Step 92, Macro Cell determine destination node according to the handover request message receiving, distribute the Old eNB UE X2AP ID between Macro and destination node (as other eNB), and the Old eNB UE X2AP ID between the Macro and the Small Cell that carry in this handover request message is revised as to the Old eNB UE X2AP ID between Macro and destination node (as other eNB), amended Handover Request message is sent to destination node (as other eNB);
Wherein, Old eNB UE X2AP ID refers in the eNB of source for UE corresponding to unique identification X2 interface.
Further, if user's face (S1-U interface) is connected to SGW by Macro Cell, Macro Cell also needs self transport layer address and the GTP TEID carrying in this handover request message to be revised as respectively transport layer address and the GTP TEID of SGW;
If the direct-connected SGW that is connected to of user's face (S1-U interface), Macro Cell does not need to revise the transport layer address and the GTP TEID that in this handover request message, carry;
Step 93, destination node receive after message, prepare switchable resource, and distribute the New eNB UE X2AP ID between Macro Cell and this destination node, and return to switching request response (Handover request ACK) message to Macro Cell, in this handover request ack message, carry the New eNB UE X2AP ID/Old eNB UE X2AP ID between Macro Cell and this destination node;
Wherein, New eNB UE X2AP ID refers in target eNB for UE corresponding to unique identification X2 interface.
Step 94, Macro Cell are receiving after this handover request ack message, distribute the New eNB UE X2AP ID between Macro and Small Cell, and the New eNB UE X2AP ID/Old eNB UE X2AP ID between the Macro Cell carrying in this handover request ack message and this destination node is revised as the X2AP ID between Macro and Small Cell, amended Handover Request ACK message is sent to Small Cell;
Further, if user's face (X2-U interface) is connected to destination node (as other eNB) by Macro Cell, Macro Cell also needs the transport layer address of the destination node carrying in this Handover Request ACK message and GTP TEID to be revised as transport layer address and the GTP TEID of self;
If user's face (X2-U interface) is connected directly to other eNB, Macro Cell does not need to revise the transport layer address and the GTP TEID that in this Handover Request ACK message, carry.
Automatic adjacent section process (Automatic Neighbor Relation, the ANR) process of embodiment 5, Standalone Small Cell, shown in Figure 10, comprise the following steps:
Step 101, certain eNB find Small Cell by ANR, if this eNB according to the ECGI of Small Cell judge its attributive eNB (being Macro eNB) also do not set up X2 connect, this eNB initiates renewal transmission (eNBConfiguration Transfer) message in base station by core net (Core Network, CN) to Macro Cell;
Accordingly, CN to upgrade according to this eNB the Global eNB ID(carrying in message transfer be Macro eNB) and tracking area identification (Tracking Area Identity, TAI) this eNB upgraded to message transfer route to Macro Cell;
Step 102, Macro Cell send eNB Configuration Transfer message by CN, and carry its transport layer address; Accordingly, this eNB Configuration Transfer message is routed to this eNB by CN;
Step 103, this eNB are according to the transport layer address of the Macro Cell obtaining, send X2 to Macro Cell and set up request (X2 Setup Request) message, connect to set up X2, this X2 sets up the configuration information (as Serving cell and adjacent cell) that comprises this eNB in request message etc.;
Step 104, Macro Cell are set up after request message receiving this X2, return to X2 and set up response (X2 Setup Response) message, and carry the configuration information of self to this eNB;
Step 105, Macro Cell send to Small Cell by the configuration information of this eNB acquiring by eNB config update (Configuration Update) message of X2 interface between M-S;
Step 106, Small Cell are receiving after the eNB configuration update message of Macro Cell transmission, return to eNB config update response (Configuration Update ACK) message to Macro Cell.
Said method handling process can realize with software program, and this software program can be stored in storage medium, in the time that the software program of storage is called, carries out said method step.
Based on same inventive concept, a kind of network equipment of processing procedure message is also provided in the embodiment of the present invention, because the principle that this network equipment is dealt with problems is similar to the method for above-mentioned processing procedure message, therefore the enforcement of this network equipment can be referring to the enforcement of method, repeats part and repeat no more.
Shown in Figure 11, the network equipment of a kind of processing procedure message that the embodiment of the present invention provides, this network equipment comprises:
Wherein, the cell ID in the ECGI of small-cell is made up of mark and the local district identification of macro base station; The S1-C interface of small-cell is connected to Mobility Management Entity MME by macro base station, and the X2-C interface of small-cell is connected to other nodes except self by macro base station.
Further, if the small-cell of the embodiment of the present invention is the small-cell that works alone (Standalone Small Cell), the S1-U interface of this small-cell can be connected to SGW by macro base station, also can be directly connected to SGW; Equally, the X2-U interface of this small-cell can be connected to other nodes by macro base station, also can be directly connected to other nodes;
Wherein, Standalone Small Cell refers to the small-cell with complete function, supports the resident of UE and access;
These other nodes can be other home base stations, can be also the nodes such as the home cell of other home base stations controls.
Further, if the small-cell of the embodiment of the present invention is dependent work small-cell (Non Standalone Small Cell), the S1-U interface of this small-cell is connected to gateway SGW by macro base station; The X2-U interface of small-cell is connected to other nodes except self by macro base station;
Wherein, Non Standalone Small Cell refers to the small-cell without complete function, does not support the resident of UE and access.
In the embodiment of the present invention, process message comprises dedicated process message and public procedure message.
Further, the dedicated process message of S1 interface bearing includes but not limited to following message:
Evolved Packet System RAB (EPS(Evolved Packet System) Radio Access Bearer, E-RAB) message that management process is relevant, the message that message, the handoff procedure that UE context management process is relevant is relevant, message and the relevant message of position fixing process that Non-Access Stratum (Non Access Stratum, NAS) transmitting procedure is relevant;
The public procedure message of S1 interface bearing comprises: relevant relevant message and overload (Over Load) message that process is relevant of message, base station configuration updating (the eNB CONFIGURATION UPDATE) message that process is relevant, MME config update (MME CONFIGURATION UPDATE) process of message, reseting procedure that S1 process of establishing is relevant.
Further, the dedicated process message of X2 interface carrying comprises: the message that X2 handoff procedure is relevant;
The public procedure message of X2 interface carrying comprises: relevant relevant message and resource status report (Resource Status Report) message that process is relevant of message, base station configuration updating (eNB CONFIGURATION UPDATE) message, community activation that process is relevant of message, reseting procedure that X2 process of establishing is relevant.
As a kind of implementation, processing module 112 specifically for:
If process message is the dedicated process message of S1 interface bearing, S1 Application Protocol mark S1-AP ID between the small-cell and the macro base station that carry in process message is revised as to the S1-AP ID between macro base station and MME, and amended process message is sent to MME.
Further, processing module 112 also for:
If the S1-U interface of small-cell is connected to SGW by macro base station, self transport layer address and the Tunnel End Point Identifier GTP TEID of GPRS Tunnel Protocol carrying in process message is revised as respectively to transport layer address and the GTP TEID of SGW.
Further, if process message is Evolved Packet System RAB, E-RAB sets up response message,
Further, processing module 112 also for:
If the S1-U interface of small-cell is connected to SGW by macro base station, after the E-RAB that receives MME transmission sets up request message, and amended E-RAB is being set up before request message sends to small-cell, E-RAB is being set up to the transport layer address of the SGW carrying in request message and GTP TEID and is revised as respectively transport layer address and the GTP TEID of self; And
After the E-RAB that receives small-cell transmission sets up response message, and amended E-RAB is being set up before response message sends to MME, E-RAB is being set up to self transport layer address and the GTP TEID carrying in response message and be revised as respectively transport layer address and the GTP TEID of SGW.
As another kind of implementation, processing module 112 specifically for:
If process message is the public procedure message of S1 interface bearing, the public procedure message receiving is carried out to respective handling, and return to response message to small-cell.
Further, processing module 112 also for:
Set up request message if public procedure message is S1, return to S1 set up response message to small-cell, S1 sets up and in response message, carries global unique MME mark GUMMEI information;
If public procedure message, for overload beginning message, is returned to overload and started response message to small-cell, overload starts to carry affected CN node identification in response message.
As another implementation, processing module 112 specifically for:
If process message is the dedicated process message of X2 interface carrying, X2 application protocol identification X2-AP ID between the small-cell and the macro base station that carry in process message is revised as to the X2-AP ID between macro base station and destination node, and amended process message is sent to destination node.
Further, processing module 112 also for:
If the S1-U interface of small-cell is connected to SGW by macro base station, and process message is handover request message, before amended handover request message is sent to destination node, self transport layer address and the GTP TEID carrying in handover request message is revised as respectively to transport layer address and the GTP TEID of SGW.
Further, processing module 112 also for:
If the X2-U interface of small-cell is connected to destination node by macro base station, after amended handover request message is sent to destination node, self transport layer address and GTP TEID are revised as respectively in the transport layer address of the destination node carrying in switching request acknowledgement message and GTP TEID, and amended switching request acknowledgement message is sent to small-cell.
As another implementation, processing module 112 specifically for:
If process message is the public procedure message of X2 interface carrying, the process message receiving is carried out to respective handling, and return to response message to small-cell.
Based on same inventive concept, a kind of network equipment of process of transmitting message is also provided in the embodiment of the present invention, because the principle that this network equipment is dealt with problems is similar to the method for above-mentioned process of transmitting message, therefore the enforcement of this network equipment can be referring to the enforcement of method, repeats part and repeat no more.
Shown in Figure 12, the network equipment of a kind of process of transmitting message that the embodiment of the present invention provides, comprising:
Determination module 121, for being identified for carrying the interface connection of process message to be sent, carries the E-UTRAN community overall identification ECGI of self in process message;
Sending module 122, connects the macro base station process of transmitting message to self ownership for the interface by definite;
Wherein, the cell ID in the ECGI of small-cell is made up of mark and the local district identification of macro base station; The S1-C interface of small-cell is connected to Mobility Management Entity MME by macro base station, and the X2-C interface of small-cell is connected to other nodes except self by macro base station.
Further, if the small-cell of the embodiment of the present invention is the small-cell that works alone (Standalone Small Cell), the S1-U interface of this small-cell can be connected to SGW by macro base station, also can be directly connected to SGW; Equally, the X2-U interface of this small-cell can be connected to other nodes by macro base station, also can be directly connected to other nodes;
Wherein, Standalone Small Cell refers to the small-cell with complete function, supports the resident of UE and access;
These other nodes can be other home base stations, can be also the nodes such as the home cell of other home base stations controls.
Further, if the small-cell of the embodiment of the present invention is dependent work small-cell (Non Standalone Small Cell), the S1-U interface of this small-cell is connected to gateway SGW by macro base station; The X2-U interface of small-cell is connected to other nodes by macro base station;
Wherein, Non Standalone Small Cell refers to the small-cell without complete function, does not support the resident of UE and access.
In the embodiment of the present invention, process message comprises dedicated process message and public procedure message.
Further, the dedicated process message of S1 interface bearing includes but not limited to following message:
Evolved Packet System RAB (EPS(Evolved Packet System) Radio Access Bearer, E-RAB) message that management process is relevant, the message that message, the handoff procedure that UE context management process is relevant is relevant, message and the relevant message of position fixing process that Non-Access Stratum (Non Access Stratum, NAS) transmitting procedure is relevant;
The public procedure message of S1 interface bearing comprises: relevant relevant message and overload (Over Load) message that process is relevant of message, base station configuration updating (the eNB CONFIGURATION UPDATE) message that process is relevant, MME config update (MME CONFIGURATION UPDATE) process of message, reseting procedure that S1 process of establishing is relevant.
Further, the dedicated process message of X2 interface carrying comprises: the message that X2 handoff procedure is relevant;
The public procedure message of X2 interface carrying comprises: relevant relevant message and resource status report (Resource Status Report) message that process is relevant of message, base station configuration updating (eNB CONFIGURATION UPDATE) message, community activation that process is relevant of message, reseting procedure that X2 process of establishing is relevant.
Cell ID in the ECGI of the small-cell of the embodiment of the present invention is made up of mark and the local district identification of the macro base station of its ownership; And the S1-C interface of this small-cell is connected to MME by macro base station, its X2-C interface is connected to other nodes except self by macro base station; The macro base station of this small-cell ownership, receiving after the process message of small-cell transmission, according to the type of this process message, is processed accordingly this process message, thereby has been solved the signaling/data routing issue under the intensive deployment scenario in small-cell;
In addition, consider that Local eNB and being connected of Macro eNB allow to support wireless backhaul, as microwave communication etc., now physically cannot guarantee that Local eNB is connected with the direct of MME/SGW, the wired connection mode of Local eNB and SGW cannot be guaranteed to want, the transfer of application layer need to be carried out by Macro eNB; The embodiment of the present invention provides the solution that adopts the signaling/data route in wireless backhaul situation between Local eNB and Macro eNB.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, completely implement software example or the form in conjunction with the embodiment of software and hardware aspect.And the present invention can adopt the form at one or more upper computer programs of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, equipment (system) and computer program.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction that makes to carry out by the processor of computer or other programmable data processing device produces the device for realizing the function of specifying at flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame on computer or other programmable devices.
Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to be interpreted as comprising preferred embodiment and fall into all changes and the modification of the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (29)
1. a method for processing procedure message, is characterized in that, the method comprises:
The macro base station of small-cell ownership receives the process message that described small-cell sends, and carries the E-UTRAN community overall identification ECGI of described small-cell in described process message;
Described macro base station, according to the type of described process message, is processed accordingly to described process message;
Wherein, the cell ID in the ECGI of described small-cell is made up of mark and the local district identification of described macro base station; The S1-C interface of described small-cell is connected to Mobility Management Entity MME by described macro base station, and the X2-C interface of described small-cell is connected to other nodes except self by described macro base station.
2. the method for claim 1, is characterized in that, if described small-cell is the small-cell that works alone, the S1-U interface of described small-cell is connected to gateway SGW or is directly connected to described SGW by described macro base station; The X2-U interface of described small-cell is connected to described other nodes or is directly connected to described other nodes by described macro base station.
3. the method for claim 1, is characterized in that, if described small-cell is dependent work small-cell, the S1-U interface of described small-cell is connected to gateway SGW by described macro base station; The X2-U interface of described small-cell is connected to described other nodes by described macro base station.
4. the method as described in claim 1 ~ 3 any one, is characterized in that, if the dedicated process message that described process message is S1 interface bearing, described macro base station carries out corresponding processing to described process message and further comprises:
Described macro base station is receiving after described process message, S1 Application Protocol mark S1-AP ID between the small-cell and the macro base station that carry in described process message is revised as to the S1-AP ID between macro base station and MME, and amended process message is sent to described MME.
5. method as claimed in claim 4, is characterized in that, if the S1-U interface of described small-cell is connected to SGW by described macro base station, described macro base station, before amended process message is sent to described MME, also comprises:
Self transport layer address and the Tunnel End Point Identifier GTP TEID of GPRS Tunnel Protocol carrying in described process message is revised as respectively transport layer address and the GTP TEID of described SGW by described macro base station.
6. method as claimed in claim 4, is characterized in that, sets up response message if described process message is Evolved Packet System RAB E-RAB, and described macro base station also comprised before the E-RAB that receives the transmission of described small-cell sets up response message:
The E-RAB that described macro base station receives MME transmission sets up request message;
The S1-AP ID that described macro base station is set up described E-RAB between macro base station and the MME carrying in request message is revised as the S1-AP ID between small-cell and macro base station, and amended E-RAB is set up to request message sends to described small-cell;
Wherein, to set up response message be that described small-cell is being set up after request message is set up interface-free resources and fed back to described macro base station according to amended E-RAB to described E-RAB.
7. method as claimed in claim 6, is characterized in that, if the S1-U interface of described small-cell is connected to SGW by described macro base station,
Described macro base station is receiving after E-RAB that MME sends sets up request message, and amended E-RAB set up before request message sends to described small-cell, also comprises:
Described macro base station is set up E-RAB the transport layer address of the described SGW carrying in request message and GTP TEID and is revised as respectively transport layer address and the GTP TEID of self;
Described macro base station is receiving after E-RAB that described small-cell sends sets up response message, and amended E-RAB set up before response message sends to described MME, also comprises:
Described macro base station is set up by E-RAB self transport layer address and the GTP TEID carrying in response message and is revised as respectively transport layer address and the GTP TEID of described SGW.
8. the method as described in claim 1 ~ 3 any one, is characterized in that, if the public procedure message that described process message is S1 interface bearing, described macro base station carries out corresponding processing to described process message and further comprises:
Described macro base station carries out respective handling to receiving described public procedure message, and returns to response message to described small-cell.
9. method as claimed in claim 8, is characterized in that, sets up request message if described public procedure message is S1, and described macro base station returns to response message to described small-cell and further comprises:
Described macro base station returns to S1 to described small-cell and sets up response message, and described S1 sets up and in response message, carries global unique MME mark GUMMEI information.
10. the method as described in claim 1 ~ 3 any one, is characterized in that, if described process message is the dedicated process message of X2 interface carrying, described macro base station carries out corresponding processing to described process message and further comprises:
Described macro base station is receiving after described process message, X2 application protocol identification X2-AP ID between the small-cell and the macro base station that carry in described process message is revised as to the X2-AP ID between macro base station and destination node, and amended process message is sent to described destination node.
11. methods as claimed in claim 10, it is characterized in that, if the S1-U interface of described small-cell is connected to SGW by described macro base station, and described process message is handover request message, described macro base station, before amended handover request message is sent to described destination node, also comprises:
Self transport layer address and the GTP TEID carrying in described handover request message is revised as respectively transport layer address and the GTP TEID of described SGW by described macro base station.
12. methods as claimed in claim 11, is characterized in that, if the X2-U interface of described small-cell is connected to destination node by described macro base station, described macro base station, after amended handover request message is sent to described destination node, also comprises:
Described macro base station receives the switching request acknowledgement message that described destination node sends;
Described macro base station is revised as the transport layer address of the described destination node carrying in described switching request acknowledgement message and GTP TEID respectively self transport layer address and GTP TEID, and amended switching request acknowledgement message is sent to described small-cell.
13. methods as described in claim 1 ~ 3 any one, is characterized in that, if described process message is the public procedure message of X2 interface carrying, described macro base station carries out corresponding processing to described process message and further comprises:
Described macro base station carries out respective handling to the process message receiving, and returns to response message to described small-cell.
The method of 14. 1 kinds of process of transmitting message, is characterized in that, the method comprises:
Small-cell is identified for carrying the interface connection of process message to be sent, carries the E-UTRAN community overall identification ECGI of self in described process message;
Described small-cell is connected to the macro base station of self ownership and is sent described process message by definite interface;
Wherein, the cell ID in the ECGI of described small-cell is made up of mark and the local district identification of described macro base station; The S1-C interface of described small-cell is connected to Mobility Management Entity MME by described macro base station, and the X2-C interface of described small-cell is connected to other nodes except self by described macro base station.
15. methods as claimed in claim 14, is characterized in that, if described small-cell is the small-cell that works alone, the S1-U interface of described small-cell is connected to gateway SGW or is directly connected to described SGW by described macro base station; The X2-U interface of described small-cell is connected to described other nodes or is directly connected to described other nodes by described macro base station.
16. methods as claimed in claim 14, is characterized in that, if described small-cell is dependent work small-cell, the S1-U interface of described small-cell is connected to gateway SGW by described macro base station; The X2-U interface of described small-cell is connected to described other nodes by described macro base station.
17. methods as described in claim 14 ~ 16 any one, is characterized in that, described process message comprise dedicated process message and with public procedure message.
The network equipment of 18. 1 kinds of processing procedure message, is characterized in that, this network equipment comprises:
Receiver module, the process message sending for receiving small-cell, carries the E-UTRAN community overall identification ECGI of described small-cell in described process message;
Processing module, for according to the type of described process message, processes accordingly to described process message;
Wherein, the cell ID in the ECGI of described small-cell is made up of mark and the local district identification of described macro base station; The S1-C interface of described small-cell is connected to Mobility Management Entity MME by described macro base station, and the X2-C interface of described small-cell is connected to other nodes except self by described macro base station.
19. network equipments as claimed in claim 18, is characterized in that, described processing module specifically for:
If the dedicated process message that described process message is S1 interface bearing, S1 Application Protocol mark S1-AP ID between the small-cell and the macro base station that carry in described process message is revised as to the S1-AP ID between macro base station and MME, and amended process message is sent to described MME.
20. network equipments as claimed in claim 19, is characterized in that, described processing module also for:
If the S1-U interface of described small-cell is connected to SGW by described macro base station, self transport layer address and the Tunnel End Point Identifier GTP TEID of GPRS Tunnel Protocol carrying in described process message is revised as respectively to transport layer address and the GTP TEID of described SGW.
21. network equipments as claimed in claim 19, is characterized in that, set up response message if described process message is Evolved Packet System RAB E-RAB,
Described receiver module also for: receive MME send E-RAB set up request message;
Described processing module also for: the S1-AP ID that described E-RAB is set up between macro base station and the MME that request message carries is revised as the S1-AP ID between small-cell and macro base station, and amended E-RAB is set up to request message sends to described small-cell;
Wherein, to set up response message be that described small-cell is being set up after request message is set up interface-free resources and fed back to described macro base station according to amended E-RAB to described E-RAB.
22. network equipments as claimed in claim 21, is characterized in that, described processing module also for:
If the S1-U interface of described small-cell is connected to SGW by described macro base station, after the E-RAB that receives MME transmission sets up request message, and amended E-RAB is being set up before request message sends to described small-cell, E-RAB is being set up to the transport layer address of the described SGW carrying in request message and GTP TEID and is revised as respectively transport layer address and the GTP TEID of self; And
After the E-RAB that receives the transmission of described small-cell sets up response message, and amended E-RAB is being set up before response message sends to described MME, E-RAB is being set up to self transport layer address and the GTP TEID carrying in response message and be revised as respectively transport layer address and the GTP TEID of described SGW.
23. network equipments as claimed in claim 18, is characterized in that, described processing module specifically for:
If the public procedure message that described process message is S1 interface bearing, carries out respective handling to the described public procedure message receiving, and returns to response message to described small-cell.
24. network equipments as claimed in claim 23, is characterized in that, described processing module also for:
Set up request message if described public procedure message is S1, return to S1 set up response message to described small-cell, described S1 sets up and in response message, carries global unique MME mark GUMMEI information.
25. network equipments as claimed in claim 18, is characterized in that, described processing module specifically for:
If described process message is the dedicated process message of X2 interface carrying, X2 application protocol identification X2-AP ID between the small-cell and the macro base station that carry in described process message is revised as to the X2-AP ID between macro base station and destination node, and amended process message is sent to described destination node.
26. network equipments as claimed in claim 25, is characterized in that, described processing module also for:
If the S1-U interface of described small-cell is connected to SGW by described macro base station, and described process message is handover request message, before amended handover request message is sent to described destination node, self transport layer address and the GTP TEID carrying in described handover request message is revised as respectively to transport layer address and the GTP TEID of described SGW.
27. network equipments as claimed in claim 26, is characterized in that, described processing module also for:
If the X2-U interface of described small-cell is connected to destination node by described macro base station, after amended handover request message is sent to described destination node, self transport layer address and GTP TEID are revised as respectively in the transport layer address of the described destination node carrying in described switching request acknowledgement message and GTP TEID, and amended switching request acknowledgement message is sent to described small-cell.
28. network equipments as claimed in claim 18, is characterized in that, described processing module specifically for:
If described process message is the public procedure message of X2 interface carrying, the process message receiving is carried out to respective handling, and return to response message to described small-cell.
The network equipment of 29. 1 kinds of process of transmitting message, is characterized in that, this network equipment comprises:
Determination module, for being identified for carrying the interface connection of process message to be sent, carries the E-UTRAN community overall identification ECGI of self in described process message;
Sending module, connects to the macro base station of self ownership and sends described process message for the interface by definite;
Wherein, the cell ID in the ECGI of described small-cell is made up of mark and the local district identification of described macro base station; The S1-C interface of described small-cell is connected to Mobility Management Entity MME by described macro base station, and the X2-C interface of described small-cell is connected to other nodes except self by described macro base station.
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