CN104519486A - Method and system for updating secret key on wireless side in heterogeneous network - Google Patents

Method and system for updating secret key on wireless side in heterogeneous network Download PDF

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Publication number
CN104519486A
CN104519486A CN201310453250.6A CN201310453250A CN104519486A CN 104519486 A CN104519486 A CN 104519486A CN 201310453250 A CN201310453250 A CN 201310453250A CN 104519486 A CN104519486 A CN 104519486A
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base station
key updating
entity
user face
key
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CN104519486B (en
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许森
孙震强
朱彩勤
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method and a system for updating secret keys on a wireless side in a heterogeneous network. The method for updating secret keys on a wireless side in a heterogeneous network comprises: after a macro base station control plane entity receives a secret key updating request, performing secret key updating, and sending a secret key updating notification for a corresponding terminal, so that the terminal updates the secret key after receiving the secret key updating notification, and sending a terminal secret key updating completing message to the macro base station control plane entity after accessing a small base station; and sending an updating indication notification for a small base station user plane entity, so that the small base station user plane entity performs corresponding configuration aimed at the secret key updating according to the updating indication notification, after the terminal is successful in accessing a network, the small base station user plane entity performing secret key updating and small base station user plane parameter configuration updating, and sending small base station secret key updating successful response to the macro base station control plane entity. The method and the system effectively solve a problem of secret key updating under the condition that a control plane and a user plane are separated in a heterogeneous network.

Description

For the method and system of wireless side key updating in heterogeneous network
Technical field
The present invention relates to the communications field, particularly a kind of method and system for wireless side key updating in heterogeneous network.
Background technology
Along with user is to LTE(Long Term Evolution, Long Term Evolution) network capacity and cover the rising of demand, certainly will need to introduce little base station (Small Cell) in following LTE network to cover to absorb traffic and to strengthen, corresponding network topology as shown in Figure 1.But being introduced in of traditional little base station can increase interference between node to a certain extent and for the negative impact of the generation of terminal mobility.At 3GPP(The3rd Generation Partnership Project, third generation partner program) R12 research on standard in, the little base station of Small Cell Enhancement(strengthens, and is called for short: SCE) subject under discussion mainly studies the relevant issues such as capacity and mobility in heterogeneous network.The framework that in this research topic, primary study user face is separated with chain of command, as shown in Figure 2, the transmission of data surface is only carried out in little base station to corresponding framework to terminal use, and carries out the transmission of user face and chain of command at macro base station.This kind of mode is called as dual link (Dual Connection), the interference for macro base station control channel is reduced under same deployment scenario frequently, and the resource that can effectively utilize macro base station and little base station, to improve the throughput of terminal and the switching frequency reduced between base station, improves user's impression simultaneously.
Still user face and the chain of command framework of little base station is not determined in current SCE subject under discussion, consider the time delay of return link and the design convenience of terminal protocol stack, the little base station that the present invention mainly discusses has a complete set of user face framework, macro base station is receiving IP(Internet Protocol, Internet protocol) after packet forward partial data in little base station.And the RRC(RadioResource Control of little base station, wireless heterogeneous networks) function is positioned at macro base station, and corresponding protocol stack is as shown in Figure 3.
In LTE and LTE_A system, the encrypt and decrypt of base station side and integrity protection are all by PDCP(Packet Data Convergence Protocol, PDCP) layer safeguards, and the key of base station side is usual and PCI(Physical Cell Identity, Physical Cell Identifier), base station down frequency point number EARFCN DL has relation, for in R11 and version before, the data splitting point of carrier aggregation is positioned at MAC(Medium Access Control, medium education) layer, owing to only having a PDCP layer, and the control message of terminal is only positioned on main carrier, therefore only need to safeguard a set of key.
R11 and before version LTE system in key change have following several situation:
[1]. in order to ensure the replacing key that fail safe is carried out after X2 has switched;
[2]. base station side is in order to avoid having identical RB(Radio Bearer, radio bearer) mark and the reusing of COUNT value of identical KeNB and the key updating that triggers;
[3] .MME activated user contextual modifications and the key updating caused.
Above-mentioned key is changed and is all taken in base station side the renewal that switching within cell (intra-cell handover) carries out key.Although the flow process that base station side realizes switching within cell is an off-gauge process.But its basic procedure is base station side sends RRC connection reallocation message to after terminal, because terminal can be linked into this base station subsequently again by random access procedure.PDCP, RLC(Radio Link Control of base station side, wireless spread-spectrum technology), MAC layer all may also exist the processing method different from other switching types to the data received with the data that will send.Cell merge base station side realization flow as shown in Figure 4, wherein:
Step 1:PDCP or MME(Mobility Management Entity, mobile management entity) RRM(Radio Resource Management in trigger base station, RRM) module initiates Intra-Cell Handover procedures.Such as signaling message is O_PDCPRRC_COUNT_ROUNF_IND.
Step 2:RRM module recalculates key, such as, calculate according to the definition in agreement TS33.401.
The rrc layer that step 3:RRM sends base station sends connection reconfiguration request, starts switching within cell.Such as signaling message is O_RRCCFG_REQ.
Step 4: the rrc layer of base station sends RRC reconfiguration request message to terminal, new delivering key to terminal, and indicating terminal is by random access procedure connecting system again.Such as signaling message is O_RRCPDCP_DATA_REQ.
Step 5:RRC indicates PDCP layer to carry out switching in cell merge, and PDCP needs the resource of carrying out being correlated with to prepare.Such as signaling is O_RRCPDCP_INTRA_CELL_HO_REQ.
What step 6:RLC received the instruction of PDCP layer re-establishes Indication message, and rlc layer performs follow-up feedback operation after needing to wait for that bottom completes relevant reprovision.Such as signaling message is O_PDCPRLC_RESTABLISH_REQ.
Step 7:RRC layer instruction MAC layer directly resets.Such as signaling message is O_RRCMAC_REST_REQ.
Step 8:UE Stochastic accessing, request dispatching CRNTI.Such as signaling message is O_SDMAC_UPPS_IND.
Step 9-10:RRM module redistributes CRNTI, and utilizes the MSG2 of Stochastic accessing this result notification terminal.Such as signaling message is respectively O_MACRRM_CRNTI_ALLOC_REQ and O_RRMMAC_CRNTI_ALLOC_RSP.
Step 11: message has been reshuffled in the RRC connection that base station physical layer (PHY) receives UE.Such as signaling message is O_CCMAC_DATA_IND (MSG3 & CRNTI).
Step 12:MAC notifies that the UE of RLC switching within cell completes access.Such as signaling message is O_MACRLC_CRNTI_IND.After RLC receives this message, the switching within cell information according to preserving judges whether this UE is carrying out switching within cell, if so, then re-establishes all built RB, and returns to PDCP and re-establish acknowledge message, the switching within cell information deletion simultaneously will processed.
Step 13:MAC sends RRC connection to RLC and has reshuffled message.Such as signaling message is O_MACRLC_DATA_IND.
Step 14:RLC notifies that the UE of PDCP switching within cell completes access.Such as signaling message is O_RLCPDCP_RESTABLISH_CNF.
Rlc layer remains cell handover information, waits for that the reconstruction of all built vertical RB of this user is carried out in the instruction of MAC layer again.Wherein for TM(Transparent Mode, transparent mode) RLC transmitting terminal entity, abandon all RLC SDU(Service Data Unit, service data unit), and all correlated variabless of this entity of initialization, for UM(Unacknowledge Mode, Unacknowledged Mode) RLC transmitting terminal entity, abandon all RLC SDU, stop all clocks, the state variable that initialization is all, for UM RLC receiving terminal entity, RLC PDU(Protocol Data Unit all in restructuring current buffer, protocol Data Unit), and the RLC SDU recombinated out is submitted to upper strata, and stop all clocks and all state variable of initialization, for AM(Acknowledge Mode, affirmation mode) RLC entity, AMD PDU(Acknowledged Mode Data Protocol DataUnit all in restructuring rx-side buffering district, acknowledged mode data unit), AMD PDU Segment, and the RLC SDU recombinated out is submitted to upper strata, abandon all RLC PDU(of receiving terminal and comprise data PDU and control PDU), abandon the RLC SDU that transmitting terminal is all, and stop all clocks and all state variable of initialization.
Step 15:RLC sends RRC connection to PDCP and has reshuffled message.In the upstream direction, the RLC SDU recombinated out is submitted to PDCP by O_RLCPDCP_DATA_IND message by RLC.
Step 16:RRM module sends RRC connection and has reshuffled message.Such as signaling message is O_PDCPRRC_DATA_IND (RRC Connection Reconfigure Complete).
Step 17:RRM module instruction PDCP completes switching, and PDCP module performs the relevant process that reorders.Such as signaling message is O_RRCPDCP_HO_COMPLETE.
Step 18:RRC notifies that RRM module completes RRC connection and reshuffled.Such as signaling message is O_RRCRRM_RECFG_RSP.
But, if the key before heterogeneous network continues to continue to use R11 is safeguarded and update mode will exist following problem:
1, two base stations adopt same set of key to bring security breaches: in the network design of reality, macro base station and little base station exist PCI and downlink frequency period all there are differences, and all there is complete user face, therefore being configured for two base stations and may causing the encryption and decryption system of LTE wireless side that larger change occurs of a set of key, and many potential safety hazards may be brought.
2, Current protocol does not support that the key of auxiliary carrier wave is changed: when needs carry out key updating time, in current LTE and LTE_A air protocol, switching behavior is all occur on main carrier, therefore only support the key updating of main carrier, the key updating of auxiliary carrier wave cannot be supported.Therefore the method before R12 cannot be applied to the scene of heterogeneous network dual link.
3, thresholding cannot be changed for each little base station configures unified key: the situation in order to prevent PDCP COUNT value from upset occurring in LTE and LTE_A system, usually by OMC(Operation & Maintenance Center, operation maintenance center) or base station algorithm a COUNT value thresholding be set change in advance trigger key, when reaching this thresholding, PDCP module request RRM module recalculates key, transmission time between inside of base station modules is very little, and the response therefore between module is relatively timely.And owing to being carried by IP backbone links between the PDCP module and the RRM module of macro base station of the medium and small base station of actual deployment process in heterogeneous environment, but not the mode of data/address bus, therefore larger propagation delay time must be deposited, and different DRB(Data Radio Bearer, Data Radio Bearer) transmission rate that carries is also different, if therefore arrange a larger PDCPCOUNT value upset thresholding, may exist before macro base station feeds back new key updating, just there is upset thus brought safety issue in the PDCP COUNT value of little base station, and if less PDCP COUNT value is set overturns thresholding and may cause repeatedly key updating, thus waste a large amount of space interface signalings.
Summary of the invention
The embodiment of the present invention provides a kind of method and system for wireless side key updating in heterogeneous network, efficiently solves the key updating problem under chain of command and user face separate condition in heterogeneous network.
According to an aspect of the present invention, a kind of method for wireless side key updating in heterogeneous network is provided, comprises:
Macro base station chain of command entity, after receiving key updating request, extracts terminal iidentification from key updating request;
Macro base station chain of command entity carries out key updating and calculates to obtain the key after upgrading;
Macro base station chain of command entity sends key updating notice to the terminal corresponding with terminal iidentification; So that described terminal carries out key updating after receiving key updating notice, and complete message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access;
Macro base station chain of command entity sends to little base station user face entity and upgrades instruction notice, so that little base station user face entity carries out corresponding configuration according to renewal instruction notice for key updating;
Little base station user face entity, after described terminal success access network, carries out key updating and little base station user face parameter configuration upgrades, and sends little base station key to macro base station chain of command entity and be updated successfully response.
Preferably, key updating request is sent by little base station user face entity, mobile management entity or macro base station user entity.
Preferably, macro base station chain of command entity carry out key updating calculate with obtain upgrade after key step after, also comprise:
Judge whether key updating request is sent by little base station user face entity or mobile management entity;
If key updating request is sent by little base station user face entity or mobile management entity, judge whether the terminal corresponding with terminal iidentification has the function be simultaneously connected with little base station user face and macro base station user face;
If described terminal has the function be connected with little base station user face and macro base station user face simultaneously, then judge whether little base station user face has the carrying be associated with described terminal further;
If little base station user face has the carrying be associated with described terminal, then perform macro base station chain of command entity and send to the terminal be associated with terminal iidentification the step that key updating notifies.
Preferably, if key updating request be not sent by little base station user face entity or mobile management entity, described terminal is not when to have in the function or little base station user face that are connected with little base station user face and macro base station user face the carrying be associated with described terminal simultaneously, macro base station chain of command entity carries out key updating according to predetermined switching within cell flow process.
Preferably, little base station user face entity judges whether PDCP COUNT value is greater than triggering thresholding, and the average transmission and the processing delay that wherein trigger the velocity maximum of thresholding and data on little base station user face and little base station and macro base station are associated;
If PDCP COUNT value is greater than triggering thresholding, then little base station user face entity sends key updating request to macro base station chain of command entity.
Preferably, to send to macro base station chain of command entity after little base station key is updated successfully the step of response at little base station user face entity, also comprise:
Macro base station chain of command entity is updated successfully according to little base station key the key updating request sequence number that response comprises, and judges whether that this key updating request is provided by mobile management entity;
If determine, this key updating request is provided by mobile management entity, then send key updating success feedback information to mobile management entity.
Preferably, described key updating notice comprise and need the carrier identification of more new key, need the cell ID of more new key, the more new key that is associated with cell ID and configuration information, the PRACH configuration information be associated with cell ID, the new user ID that is associated with cell ID.
Preferably, the step that described terminal carries out key updating after receiving key updating notice comprises:
Described terminal, after receiving key updating notice, identifies that key updating notifies the type of cell ID and the carrier identification comprised;
If cell ID and carrier identification are little base station carrier mark, the then described terminal described more new key that utilizes key updating to notify to comprise and configuration information, the more key in the auxiliary user face of new terminal, and reset terminal auxiliary user face parameter;
If cell ID and carrier identification are macro base station, main server carrier identifies, then utilize the key updating of predetermined switching within cell flow performing macro base station main carrier.
Preferably, the step that described terminal completes message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access comprises:
The described new user ID that described terminal utilizes key updating to notify to comprise and PRACH configuration information, little base station carrier carries out Stochastic accessing;
After described terminal completes Stochastic accessing on little base station, complete message to the key updating of macro base station chain of command entity transmitting terminal.
Preferably, described terminal, when access network first, reports described terminal whether to have the function be simultaneously connected with little base station user face and macro base station user face to macro base station chain of command.
According to a further aspect in the invention, a kind of system for wireless side key updating in heterogeneous network is provided, comprises macro base station, little base station and terminal, macro base station comprises macro base station chain of command entity and macro base station user entity, and little base station comprises little base station user face entity, wherein:
Macro base station chain of command entity, for after receiving key updating request, extracts terminal iidentification from key updating request, carries out key updating and calculates to obtain the key after upgrading; Key updating notice is sent to the terminal corresponding with terminal iidentification; Send to little base station user face entity and upgrade instruction notice;
Described terminal, for carrying out key updating after receiving the key updating notice of macro base station chain of command entity transmission, and completes message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access;
Little base station user face entity, for the renewal instruction notice sent according to macro base station chain of command entity, carries out corresponding configuration for key updating; After described terminal success access network, carry out key updating and little base station user face parameter configuration upgrades, and send little base station key to macro base station chain of command entity and be updated successfully response.
Preferably, key updating request is sent by little base station user face entity, mobile management entity or macro base station user entity.
Preferably, macro base station chain of command entity also for carry out key updating calculate with obtain upgrade after key after, judge whether key updating request is sent by little base station user face entity or mobile management entity, if key updating request is sent by little base station user face entity or mobile management entity, judge whether the terminal corresponding with terminal iidentification has the function be simultaneously connected with little base station user face and macro base station user face, if described terminal has the function be connected with little base station user face and macro base station user face simultaneously, then judge whether little base station user face has the carrying be associated with described terminal further, if little base station user face has the carrying be associated with described terminal, then perform and send to the terminal be associated with terminal iidentification the operation that key updating notifies.
Preferably, macro base station chain of command entity also in key updating request be not sent by little base station user face entity or mobile management entity, described terminal not have in the function or little base station user face that are connected with little base station user face and macro base station user face the carrying be associated with described terminal simultaneously time, carry out key updating according to predetermined switching within cell flow process.
Preferably, little base station user face entity is also for judging whether PDCP COUNT value is greater than triggering thresholding, and the average transmission and the processing delay that wherein trigger the velocity maximum of thresholding and data on little base station user face and little base station and macro base station are associated; If PDCP COUNT value is greater than triggering thresholding, then send key updating request to macro base station chain of command entity.
Preferably, macro base station chain of command entity is also for receiving after little base station key that little base station user face entity sends is updated successfully response, be updated successfully according to little base station key the key updating request sequence number that response comprises, judge whether that this key updating request is provided by mobile management entity; If determine, this key updating request is provided by mobile management entity, then send key updating success feedback information to mobile management entity.
Preferably, described key updating notice comprise and need the carrier identification of more new key, need the cell ID of more new key, the more new key that is associated with cell ID and configuration information, the PRACH configuration information be associated with cell ID, the new user ID that is associated with cell ID.
Preferably, described terminal also for after receiving key updating notice, identifies that key updating notifies the type of cell ID and the carrier identification comprised; If cell ID and carrier identification are little base station carrier mark, the then described terminal described more new key that utilizes key updating to notify to comprise and configuration information, the more key in the auxiliary user face of new terminal, and reset terminal auxiliary user face parameter; If cell ID and carrier identification are macro base station, main server carrier identifies, then utilize the key updating of predetermined switching within cell flow performing macro base station main carrier.
Preferably, described terminal also for the described new user ID that utilizes key updating to notify to comprise and PRACH configuration information, little base station carrier carries out Stochastic accessing; After complete Stochastic accessing on little base station, complete message to the key updating of macro base station chain of command entity transmitting terminal.
Preferably, described terminal also for when access network first, reports described terminal whether to have the function be simultaneously connected with little base station user face and macro base station user face to macro base station chain of command.
The present invention by macro base station chain of command entity after receiving key updating request, carry out key updating and calculate to obtain the key after upgrading, and send key updating notice to corresponding terminal, so that described terminal carries out key updating after receiving key updating notice, and complete message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access; Also send to little base station user face entity and upgrade instruction notice, so that little base station user face entity carries out corresponding configuration according to renewal instruction notice for key updating, little base station user face entity is after described terminal success access network, carry out key updating and little base station user face parameter configuration to upgrade, and send little base station key to macro base station chain of command entity and be updated successfully response.Thus the key updating problem efficiently solved in heterogeneous network under chain of command and user face separate condition.
Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the network topology schematic diagram after disposing little base station.
Fig. 2 be in heterogeneous network user face be separated with chain of command under protocol stack divide schematic diagram.
Fig. 3 is the protocol stack schematic diagram of base station and terminal in dual link situation.
Fig. 4 is the key updating mode based on cell merge.
Fig. 5 is the schematic diagram of a wireless side key updating method embodiment in heterogeneous network of the present invention.
Fig. 6 is the schematic diagram of another embodiment of wireless side key updating method in heterogeneous network of the present invention.
Fig. 7 is the schematic diagram of an end side key updating method of the present invention embodiment.
Fig. 8 is the schematic diagram of the key updating flow process embodiment that base station side of the present invention is separated with user face for chain of command.
Fig. 9 is the schematic diagram of a wireless side key updating system embodiment in heterogeneous network of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.
Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification.
In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.
Fig. 5 is the schematic diagram of a wireless side key updating method embodiment in heterogeneous network of the present invention.
As shown in Figure 5, the method step of the present embodiment is as follows:
Step 501, macro base station chain of command entity, after receiving key updating request, extracts terminal iidentification from key updating request.
Preferably, key updating request is sent by little base station user face entity, mobile management entity or macro base station user entity.
Preferably, key updating request at least comprises:
[1]. need the identification list of the Deta bearer upgraded
[2]. terminal iidentification
[3]. update request sequence number
Preferably, little base station user face entity judges whether PDCP COUNT value is greater than triggering thresholding, and the average transmission and the processing delay that wherein trigger the velocity maximum of thresholding and data on little base station user face and little base station and macro base station are associated.If PDCP COUNT value is greater than triggering thresholding, then little base station user face entity sends key updating request to macro base station chain of command entity.
In one embodiment, thresholding TH=Th is triggered oMC-2*V* τ, wherein Th oMCrepresent the thresholding that webmaster or algorithm are arranged, this numerical value is less than the maximum PDCPCOUNT thresholding defined in agreement usually; V=max (DRB 1, DRB 2..., DRB n), the DRB value in bracket is the speed of Data Radio Bearer on little base station user face; τ is average transmission and the processing delay of little base station and macro base station.
Step 502, macro base station chain of command entity carries out key updating and calculates to obtain the key after upgrading.
Step 503, macro base station chain of command entity sends key updating notice to the terminal corresponding with terminal iidentification; So that described terminal carries out key updating after receiving key updating notice, and complete message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access.
Preferably, at least comprise in key updating notice:
need with the carrier identification list of changing key
need with the other list of the cell ID changing key
each need to upgrade the key of key community and configuration, some or all of as in securityAlgorithmConfig, keyChangeIndicator and nextHopChainingCount of comprising in agreement TS36.331
each PRACH(Physical Random AccessChannel needing replacing key community, Physical Random Access Channel) configuration information
each new user ID other (as C-RNTI(Cell-RadioNetwork Temporary Identifier, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI) needing replacing key community)
Step 504, macro base station chain of command entity sends to little base station user face entity and upgrades instruction notice, so that little base station user face entity carries out corresponding configuration according to renewal instruction notice for key updating.
Preferably, corresponding configuration comprises: PDCP layer obtains new key information and configuration, and rlc layer perform follow-up feedback operation, and MAC layer directly carries out the replacement of parameter and timer after needing to wait for that MAC layer and physical layer complete relevant reprovision.
Step 505, little base station user face entity, after described terminal success access network, carries out key updating and little base station user face parameter configuration upgrades, and sends little base station key to macro base station chain of command entity and be updated successfully response.
Preferably, after the success that the MAC layer of little base station successfully receives terminal is linked into the request of network, reset for user face data, wherein the rlc layer that is operating as of rlc layer remains cell handover information, waits for that the instruction of MAC layer is in the reconstruction carrying out all built vertical RB of this user.Wherein for TM RLC transmitting terminal entity, abandon all RLC SDU, and all correlated variabless of this entity of initialization, for UM RLC transmitting terminal entity, abandon all RLC SDU, stop all clocks, the state variable that initialization is all, for UMRLC receiving terminal entity, RLC PDU all in restructuring current buffer, and the RLC SDU recombinated out is submitted to upper strata, and stop all clocks and all state variable of initialization; For AM RLC entity, AMD PDU, AMDPDU Segment all in restructuring rx-side buffering district, and the RLC SDU recombinated out is submitted to upper strata; Abandon all RLC PDU(of receiving terminal and comprise data PDU and control PDU), abandon the RLCSDU that transmitting terminal is all, and stop all clocks and all state variable of initialization.
Preferably, little base station key is updated successfully the part that response at least comprises following information:
[1]. terminal iidentification
[2]. Deta bearer identifies
[3]. key updating request sequence number
Based on wireless side key updating method in the heterogeneous network that the above embodiment of the present invention provides, macro base station chain of command entity is after receiving key updating request, carry out key updating and calculate to obtain the key after upgrading, and send key updating notice to corresponding terminal, so that described terminal carries out key updating after receiving key updating notice, and complete message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access; Also send to little base station user face entity and upgrade instruction notice, so that little base station user face entity carries out corresponding configuration according to renewal instruction notice for key updating, little base station user face entity is after described terminal success access network, carry out key updating and little base station user face parameter configuration to upgrade, and send little base station key to macro base station chain of command entity and be updated successfully response.Thus the key updating problem efficiently solved in heterogeneous network under chain of command and user face separate condition.
Fig. 6 is the schematic diagram of another embodiment of wireless side key updating method in heterogeneous network of the present invention.As shown in Figure 6, the method step of the present embodiment is as follows:
Step 601, macro base station chain of command entity, after receiving key updating request, extracts terminal iidentification from key updating request.
Step 602, macro base station chain of command entity carries out key updating and calculates to obtain the key after upgrading.
Step 603, judges whether key updating request is sent by little base station user face entity or mobile management entity.If key updating request is sent by little base station user face entity or mobile management entity, then perform step 605; Otherwise, perform step 604.
Step 604, macro base station chain of command entity carries out key updating according to predetermined switching within cell flow process.Afterwards, other step of the present embodiment is no longer performed.
Such as, key updating can be carried out by the key updating mode shown in Fig. 4.
Step 605, judges whether the terminal corresponding with terminal iidentification has the function be simultaneously connected with little base station user face and macro base station user face.If described terminal has the function be connected with little base station user face and macro base station user face simultaneously, then perform step 606; Otherwise, perform step 604.
Step 606, judges whether little base station user face has the carrying be associated with described terminal.If little base station user face has the carrying be associated with described terminal, then perform step 607; Otherwise, perform step 604.
Step 607, macro base station chain of command entity sends key updating notice to the terminal corresponding with terminal iidentification; So that described terminal carries out key updating after receiving key updating notice, and complete message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access.
Step 608, macro base station chain of command entity sends to little base station user face entity and upgrades instruction notice, so that little base station user face entity carries out corresponding configuration according to renewal instruction notice for key updating.
Step 609, little base station user face entity, after described terminal success access network, carries out key updating and little base station user face parameter configuration upgrades, and sends little base station key to macro base station chain of command entity and be updated successfully response.
Step 610, macro base station chain of command entity is updated successfully according to little base station key the key updating request sequence number that response comprises, and judges whether that this key updating request is provided by mobile management entity.
Step 611, if determine, this key updating request is provided by mobile management entity, then send key updating success feedback information to mobile management entity.
Fig. 7 is the schematic diagram of an end side key updating method of the present invention embodiment.As shown in Figure 7, the step that above-mentioned terminal carries out key updating after receiving key updating notice comprises:
Step 701, terminal, after receiving key updating notice, identifies that key updating notifies the type of cell ID and the carrier identification comprised.If cell ID and carrier identification are little base station carrier mark, then perform step 702; If cell ID and carrier identification are macro base station, main server carrier identifies, then perform step 703.
Step 702, the described more new key that terminal utilizes key updating to notify to comprise and configuration information, the more key in the auxiliary user face of new terminal, and reset terminal auxiliary user face parameter.Then step 704 is performed.
Step 703, utilizes the key updating of predetermined switching within cell flow performing macro base station main carrier.
Such as, the key updating mode shown in Fig. 4 can be utilized to carry out key updating.
Step 704, the described new user ID that terminal utilizes key updating to notify to comprise and PRACH configuration information, little base station carrier carries out Stochastic accessing.
Step 705, after terminal completes Stochastic accessing on little base station, completes message to the key updating of macro base station chain of command entity transmitting terminal.
Preferably, terminal, when access network first, reports described terminal whether to have the function be simultaneously connected with little base station user face and macro base station user face to macro base station chain of command.
Fig. 8 is the schematic diagram of the key updating flow process embodiment that base station side of the present invention is separated with user face for chain of command.As shown in Figure 8, the concrete journey step of key updating stream that is separated with user face of chain of command is as shown in Blocked portion in figure.Wherein:
RRM module in step 21:S-PDCP trigger base station initiates Intra-Cell Handover procedures.Such as signaling message is O_PDCPRRC_COUNT_IND.
Step 22:RRM module recalculates key.
The rrc layer that step 23:RRM sends base station sends connection reconfiguration request, starts switching within cell.Such as signaling message is O_RRCCFG_REQ.
Step 24: the rrc layer of base station sends RRC reconfiguration request message to P-PHY, new delivering key to terminal, and indicating terminal is by random access procedure connecting system again.
Step 25:RRC indicates S-PDCP layer to carry out switching in cell merge, and S-PDCP needs the resource of carrying out being correlated with to prepare.Such as signaling is O_RRCPDCP_INTRA_CELL_HO_REQ.
What step 26:S-RLC received the instruction of S-PDCP layer re-establishes Indication message, and S-RLC layer performs follow-up feedback operation after needing to wait for that bottom completes relevant reprovision.Such as signaling message is O_PDCPRLC_ESTABLISH_REQ.
Step 27:RRC layer instruction S-MAC layer directly resets.Such as signaling message is O_RRCMAC_REST_REQ.
Step 28:UE Stochastic accessing, request dispatching CRNTI.Such as signaling message is O_SDMAC_UPPS_IND.
Message has been reshuffled in the RRC connection that step 29:S-PHY receives UE.Such as signaling message is O_CCMAC_DATA_IND (MSG3 & CRNTI).
Step 30:S-MAC notifies that the UE of S-RLC switching within cell completes access, and has reshuffled message to S-RLC transmission RRC connection.Such as signaling message is O_MACRLC_IND.
Step 31:S-RLC notifies that the UE of S-PDCP switching within cell completes access.Such as signaling message is O_RLCPDCP_ESTABLISH_CNF.
Step 32:P-PHY sends RRC connection to RRC and has reshuffled message.
Step 33:RRM module instruction S-PDCP completes switching, and S-PDCP module performs the relevant process that reorders.Such as signaling message is O_RRCPDCP_HO_COMPLETE.
Step 34:RRC notifies that RRM module completes RRC connection and reshuffled.Such as signaling message is O_RRCRRM_RECFG_RSP.
Fig. 9 is the schematic diagram of a wireless side key updating system embodiment in heterogeneous network of the present invention.As shown in Figure 9, this system comprises macro base station 91, little base station 92 and terminal 93, and macro base station 91 comprises macro base station chain of command entity 911 and macro base station user entity 912, and little base station 92 comprises little base station user face entity 921.Wherein:
Macro base station chain of command entity 911, for after receiving key updating request, extracts terminal iidentification from key updating request, carries out key updating and calculates to obtain the key after upgrading; Key updating notice is sent to the terminal 93 corresponding with terminal iidentification; Send to little base station user face entity 921 and upgrade instruction notice.
Described terminal 93, for carrying out key updating after receiving the key updating notice of macro base station chain of command entity 911 transmission, and completes message to the key updating of macro base station chain of command entity 911 transmitting terminal behind the little base station of access.
Little base station user face entity 921, for the renewal instruction notice sent according to macro base station chain of command entity 911, carries out corresponding configuration for key updating; After described terminal success access network, carry out key updating and little base station user face parameter configuration upgrades, and send little base station key to macro base station chain of command entity 911 and be updated successfully response.
Based on wireless side key updating system in the heterogeneous network that the above embodiment of the present invention provides, macro base station chain of command entity is after receiving key updating request, carry out key updating and calculate to obtain the key after upgrading, and send key updating notice to corresponding terminal, so that described terminal carries out key updating after receiving key updating notice, and complete message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access; Also send to little base station user face entity and upgrade instruction notice, so that little base station user face entity carries out corresponding configuration according to renewal instruction notice for key updating, little base station user face entity is after described terminal success access network, carry out key updating and little base station user face parameter configuration to upgrade, and send little base station key to macro base station chain of command entity and be updated successfully response.Thus the key updating problem efficiently solved in heterogeneous network under chain of command and user face separate condition.
For convenience's sake, illustrate only a little base station and a terminal in fig .9, those skilled in the art are scrutable, and macro base station can carry out with Multiple Small Cell Sites and multiple terminal alternately simultaneously.
Preferably, key updating request is sent by little base station user face entity, mobile management entity or macro base station user entity.
Preferably, macro base station chain of command entity 911 also for carry out key updating calculate with obtain upgrade after key after, judge whether key updating request is sent by little base station user face entity or mobile management entity, if key updating request is sent by little base station user face entity or mobile management entity, judge whether the terminal corresponding with terminal iidentification has the function be simultaneously connected with little base station user face and macro base station user face, if described terminal has the function be connected with little base station user face and macro base station user face simultaneously, then judge whether little base station user face has the carrying be associated with described terminal further, if little base station user face has the carrying be associated with described terminal, then perform and send to the terminal be associated with terminal iidentification the operation that key updating notifies.
Preferably, macro base station chain of command entity 911 also in key updating request be not sent by little base station user face entity or mobile management entity, described terminal not have in the function or little base station user face that are connected with little base station user face and macro base station user face the carrying be associated with described terminal simultaneously time, carry out key updating according to predetermined switching within cell flow process.
Preferably, little base station user face entity 921 is also for judging whether PDCP COUNT value is greater than triggering thresholding, and the average transmission and the processing delay that wherein trigger the velocity maximum of thresholding and data on little base station user face and little base station and macro base station are associated; If PDCP COUNT value is greater than triggering thresholding, then send key updating request to macro base station chain of command entity 911.
Preferably, macro base station chain of command entity 911 is also for receiving after little base station key that little base station user face entity sends is updated successfully response, be updated successfully according to little base station key the key updating request sequence number that response comprises, judge whether that this key updating request is provided by mobile management entity; If determine, this key updating request is provided by mobile management entity, then send key updating success feedback information to mobile management entity.
Preferably, described key updating notice comprise and need the carrier identification of more new key, need the cell ID of more new key, the more new key that is associated with cell ID and configuration information, the PRACH configuration information be associated with cell ID, the new user ID that is associated with cell ID.
Preferably, described terminal 93 also for after receiving key updating notice, identifies that key updating notifies the type of cell ID and the carrier identification comprised; If cell ID and carrier identification are little base station carrier mark, the then described terminal described more new key that utilizes key updating to notify to comprise and configuration information, the more key in the auxiliary user face of new terminal, and reset terminal auxiliary user face parameter; If cell ID and carrier identification are macro base station, main server carrier identifies, then utilize the key updating of predetermined switching within cell flow performing macro base station main carrier.
Preferably, described terminal 93 also for the described new user ID that utilizes key updating to notify to comprise and PRACH configuration information, little base station carrier carries out Stochastic accessing; After complete Stochastic accessing on little base station, complete message to the key updating of macro base station chain of command entity transmitting terminal.
Preferably, described terminal 93 also for when access network first, reports described terminal whether to have the function be simultaneously connected with little base station user face and macro base station user face to macro base station chain of command.
Below by concrete example, the present invention will be described.
Embodiment 1:
The PDCP layer that the present embodiment mainly describes little base station eNB 2 triggers key updating process, and macro base station eNB1 performs relevant key updating process.Wherein network topology as shown in Figure 1.Terminal UE has dual link function, has carrying at macro base station eNB1 and little base station eNB 2, and is DRB1 wherein in macro base station eNB1, the DRB2 in little base station eNB 2, and all SRB carryings of this terminal are all positioned at macro base station.
Step 1: the change of the COUNT value of the DRB2 of little base station eNB 2 user face PDCP layer monitor terminal user, after finding that the transmission rate of current COUNT value+little base station eNB 2 to macro base station eNB1 time delay * 2*DRB2 exceedes pre-determined threshold, little base station eNB 2 user sends key towards its ownership macro base station eNB1 and changes Indication message.Have in comprising in message:
[1]. terminal iidentification
[2]. Deta bearer identifies
[3]. key updating request sequence number
Step 2: macro base station eNB1 finds that terminal supports the function of little base station and macro base station dual link, and the DRB2 of the carrying of terminal use is present in little base station eNB 2, therefore triggers the key updating process of little base station.
Step 3: macro base station eNB1 sends the key updating of message RRC ConnectionReconfiguration notification terminal by macro base station, comprises following information except information necessary in R11 in message:
the carrier identification of eNB2
the other PCI of cell ID of eNB2
eNB2 the key of key community and configuration
the new PRACH configuration information of eNB2
the other C-RNTI of new user ID of eNB2
Step 4: macro base station eNB1 indicates little base station eNB 2 to prepare for being about to carry out key updating, wherein PDCP layer obtains new key information and configuration, after rlc layer needs to wait for that bottom completes relevant reprovision, perform follow-up feedback operation, and MAC layer directly carries out the replacement of parameter and timer.
Step 5: after the success that the MAC layer of little base station eNB 2 successfully receives terminal is linked into the request of network, user face data is reset, wherein the rlc layer that is operating as of rlc layer remains cell handover information, waits for that the instruction of MAC layer is in the reconstruction carrying out all built vertical RB of this user.Wherein for TM RLC transmitting terminal entity, abandon all RLC SDU, and all correlated variabless of this entity of initialization, for UM RLC transmitting terminal entity, abandon all RLC SDU, stop all clocks, the state variable that initialization is all, for UMRLC receiving terminal entity, RLC PDU all in restructuring current buffer, and the RLC SDU recombinated out is submitted to upper strata, and stop all clocks and all state variable of initialization; For AM RLC entity, AMD PDU, AMDPDU Segment all in restructuring rx-side buffering district, and the RLC SDU recombinated out is submitted to upper strata; Abandon all RLC PDU(of receiving terminal and comprise data PDU and control PDU), abandon the RLCSDU that transmitting terminal is all, and stop all clocks and all state variable of initialization.
Step 6: terminal is feedback message RRC Connection ReconfigurationComplete on eNB1, is used to indicate macro base station key updating success.
Step 7: the user face of little base station eNB 2 is after the new key of renewal and parameter configuration, and the chain of command to macro base station eNB1 indicates key updating success response.Be updated successfully at least contain in following message in response message some or all of:
[1]. terminal iidentification
[2]. Deta bearer identifies
[3]. key updating request sequence number
Embodiment 2:
The PDCP layer that the present embodiment mainly describes little base station eNB 2 triggers key updating process, and end side UE performs relevant key updating process.Wherein network topology as shown in Figure 1, and terminal UE has dual link function, has carrying at macro base station eNB1 and little base station eNB 2, and is DRB1 wherein in macro base station eNB1, the DRB2 in little base station eNB 2, and all SRB carryings of this terminal are all positioned at macro base station.
Step 1: terminal UE, when access network, receives the RRC information UECapabilityEnquiry of base station side, requires terminal to report ability.
Step 2: terminal utilizes RRC information UECapabilityInformation to network-feedback terminal capability, comprises a bit and is used to indicate UE support dual link function in ability.
Step 3: terminal receives the RRC information RRC ConnectionReconfiguration that macro base station eNB1 sends, and this message contains following information:
the carrier identification of eNB2
the other PCI of cell ID of eNB2
eNB2 the key of key community and configuration
the new PRACH configuration information of eNB2
the other C-RNTI of new user ID of eNB2
Step 4: terminal, according to the regulation in R11 agreement, resets auxiliary user face, the new key that configuration network issues, and according to the PRACH information of the instruction of base station and C-RNTI, eNB2 carries out Stochastic accessing.
Step 5: complete Stochastic accessing on eNB2 after, terminal sends RRCConnection Reconfiguration Complete message on eNB1, changes successfully for its key of informing base station.
Embodiment 3:
What the present embodiment mainly described is macro base station eNB1 that MME triggers and little base station eNB 2 carry out key updating process, and macro base station eNB1 performs relevant key updating process.Wherein network topology as shown in Figure 1, and terminal UE has dual link function, has carrying at macro base station eNB1 and little base station eNB 2, and is DRB1 wherein in macro base station eNB1, the DRB2 in little base station eNB 2, and all SRB carryings of this terminal are all positioned at macro base station.
Step 1: macro base station receives the S1AP message UE CONTEXTMODIFICATION REQUEST that MME sends, indicates macro base station to change key in message.
Step 2: macro base station eNB1 finds that terminal supports the function of little base station and macro base station dual link, and the DRB2 of the carrying of terminal use is present in little base station eNB 2, therefore triggers the key updating process of little base station and macro base station.
Step 3: macro base station eNB1 sends the key updating of message RRC ConnectionReconfiguration notification terminal by macro base station, comprises following information except information necessary in R11 in message:
the carrier identification of eNB2
the other PCI of cell ID of eNB2
eNB2 the key of key community and configuration
the new PRACH configuration information of eNB2
the other C-RNTI of new user ID of eNB2
Step 4: macro base station eNB1 indicates little base station eNB 2 to prepare for being about to carry out key updating, wherein PDCP layer obtains new key information and configuration, after rlc layer needs to wait for that bottom completes relevant reprovision, perform follow-up feedback operation, and MAC layer directly carries out the replacement of parameter and timer.
Step 5: the mode in the re-cipher key process in terminal use face and R11 and before version is identical.
Step 6: after the success that the MAC layer of little base station eNB 2 successfully receives terminal is linked into the request of network, user face data is reset, wherein the rlc layer that is operating as of rlc layer remains cell handover information, waits for that the instruction of MAC layer is in the reconstruction carrying out all built vertical RB of this user.Wherein for TM RLC transmitting terminal entity, abandon all RLC SDU, and all correlated variabless of this entity of initialization, for UM RLC transmitting terminal entity, abandon all RLC SDU, stop all clocks, the state variable that initialization is all, for UMRLC receiving terminal entity, RLC PDU all in restructuring current buffer, and the RLC SDU recombinated out is submitted to upper strata, and stop all clocks and all state variable of initialization; For AM RLC entity, AMD PDU, AMDPDU Segment all in restructuring rx-side buffering district, and the RLC SDU recombinated out is submitted to upper strata; Abandon all RLC PDU(of receiving terminal and comprise data PDU and control PDU), abandon the RLCSDU that transmitting terminal is all, and stop all clocks and all state variable of initialization.
Step 7: terminal is feedback message RRC Connection ReconfigurationComplete on eNB1, is used to indicate macro base station key updating success.
Step 8: the user face of little base station eNB 2 is after the new key of renewal and parameter configuration, and the chain of command to macro base station eNB1 indicates key updating success response.Be updated successfully at least contain in following message in response message some or all of:
[1]. terminal iidentification
[2]. Deta bearer identifies
[3]. key updating request sequence number
By implementing the present invention, following beneficial effect can be obtained:
[1]. the key updating method that this patent proposes is relatively compared with existing wireless side key updating method, effectively can to solve in heterogeneous network Current protocol under chain of command and user face separate condition and cannot support the key updating problem of little base station, and there is consequent compatibility ensure that R11 and terminal before can access networks smoothly.
[2]. for the imperfect return link between the medium and small base station of heterogeneous network and macro base station, this patent proposes the method for a kind of PDCP COUNT value upset adaptive threshold, triggering thresholding can be set for different time delay environment self-adaptions, without the need to artificial participation, reduce the operation cost of operator.
[3]. scheme of the present invention make use of the signaling procedure of current LTE, only increases part messages unit, less to the change of network side, therefore has good exploitativeness.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.

Claims (20)

1. for a method for wireless side key updating in heterogeneous network, it is characterized in that, comprising:
Macro base station chain of command entity, after receiving key updating request, extracts terminal iidentification from key updating request;
Macro base station chain of command entity carries out key updating and calculates to obtain the key after upgrading;
Macro base station chain of command entity sends key updating notice to the terminal corresponding with terminal iidentification; So that described terminal carries out key updating after receiving key updating notice, and complete message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access;
Macro base station chain of command entity sends to little base station user face entity and upgrades instruction notice, so that little base station user face entity carries out corresponding configuration according to renewal instruction notice for key updating;
Little base station user face entity, after described terminal success access network, carries out key updating and little base station user face parameter configuration upgrades, and sends little base station key to macro base station chain of command entity and be updated successfully response.
2. method according to claim 1, is characterized in that,
Key updating request is sent by little base station user face entity, mobile management entity or macro base station user entity.
3. method according to claim 2, is characterized in that,
Macro base station chain of command entity carry out key updating calculate with obtain upgrade after key step after, also comprise:
Judge whether key updating request is sent by little base station user face entity or mobile management entity;
If key updating request is sent by little base station user face entity or mobile management entity, judge whether the terminal corresponding with terminal iidentification has the function be simultaneously connected with little base station user face and macro base station user face;
If described terminal has the function be connected with little base station user face and macro base station user face simultaneously, then judge whether little base station user face has the carrying be associated with described terminal further;
If little base station user face has the carrying be associated with described terminal, then perform macro base station chain of command entity and send to the terminal be associated with terminal iidentification the step that key updating notifies.
4. method according to claim 3, is characterized in that,
If key updating request be not sent by little base station user face entity or mobile management entity, described terminal is not when to have in the function or little base station user face that are connected with little base station user face and macro base station user face the carrying be associated with described terminal simultaneously, macro base station chain of command entity carries out key updating according to predetermined switching within cell flow process.
5. method according to claim 2, is characterized in that,
Little base station user face entity judges whether PDCP COUNT value is greater than triggering thresholding, and the average transmission and the processing delay that wherein trigger the velocity maximum of thresholding and data on little base station user face and little base station and macro base station are associated;
If PDCP COUNT value is greater than triggering thresholding, then little base station user face entity sends key updating request to macro base station chain of command entity.
6. method according to claim 2, is characterized in that,
To send to macro base station chain of command entity after little base station key is updated successfully the step of response at little base station user face entity, also comprise:
Macro base station chain of command entity is updated successfully according to little base station key the key updating request sequence number that response comprises, and judges whether that this key updating request is provided by mobile management entity;
If determine, this key updating request is provided by mobile management entity, then send key updating success feedback information to mobile management entity.
7. method according to claim 1, is characterized in that,
Described key updating notice comprises and needs the carrier identification of more new key, need the cell ID of more new key, the more new key that is associated with cell ID and configuration information, the PRACH configuration information be associated with cell ID, the new user ID that is associated with cell ID.
8. method according to claim 7, is characterized in that,
The step that described terminal carries out key updating after receiving key updating notice comprises:
Described terminal, after receiving key updating notice, identifies that key updating notifies the type of cell ID and the carrier identification comprised;
If cell ID and carrier identification are little base station carrier mark, the then described terminal described more new key that utilizes key updating to notify to comprise and configuration information, the more key in the auxiliary user face of new terminal, and reset terminal auxiliary user face parameter;
If cell ID and carrier identification are macro base station, main server carrier identifies, then utilize the key updating of predetermined switching within cell flow performing macro base station main carrier.
9. method according to claim 8, is characterized in that,
The step that described terminal completes message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access comprises:
The described new user ID that described terminal utilizes key updating to notify to comprise and PRACH configuration information, little base station carrier carries out Stochastic accessing;
After described terminal completes Stochastic accessing on little base station, complete message to the key updating of macro base station chain of command entity transmitting terminal.
10. method according to claim 9, is characterized in that,
Described terminal, when access network first, reports described terminal whether to have the function be simultaneously connected with little base station user face and macro base station user face to macro base station chain of command.
11. 1 kinds for the system of wireless side key updating in heterogeneous network, is characterized in that, comprise macro base station, little base station and terminal, and macro base station comprises macro base station chain of command entity and macro base station user entity, and little base station comprises little base station user face entity, wherein:
Macro base station chain of command entity, for after receiving key updating request, extracts terminal iidentification from key updating request, carries out key updating and calculates to obtain the key after upgrading; Key updating notice is sent to the terminal corresponding with terminal iidentification; Send to little base station user face entity and upgrade instruction notice;
Described terminal, for carrying out key updating after receiving the key updating notice of macro base station chain of command entity transmission, and completes message to the key updating of macro base station chain of command entity transmitting terminal behind the little base station of access;
Little base station user face entity, for the renewal instruction notice sent according to macro base station chain of command entity, carries out corresponding configuration for key updating; After described terminal success access network, carry out key updating and little base station user face parameter configuration upgrades, and send little base station key to macro base station chain of command entity and be updated successfully response.
12. systems according to claim 11, is characterized in that,
Key updating request is sent by little base station user face entity, mobile management entity or macro base station user entity.
13. systems according to claim 12, is characterized in that,
Macro base station chain of command entity also for carry out key updating calculate with obtain upgrade after key after, judge whether key updating request is sent by little base station user face entity or mobile management entity, if key updating request is sent by little base station user face entity or mobile management entity, judge whether the terminal corresponding with terminal iidentification has the function be simultaneously connected with little base station user face and macro base station user face, if described terminal has the function be connected with little base station user face and macro base station user face simultaneously, then judge whether little base station user face has the carrying be associated with described terminal further, if little base station user face has the carrying be associated with described terminal, then perform and send to the terminal be associated with terminal iidentification the operation that key updating notifies.
14. systems according to claim 13, is characterized in that,
Macro base station chain of command entity also in key updating request be not sent by little base station user face entity or mobile management entity, described terminal not have in the function or little base station user face that are connected with little base station user face and macro base station user face the carrying be associated with described terminal simultaneously time, carry out key updating according to predetermined switching within cell flow process.
15. systems according to claim 12, is characterized in that,
Little base station user face entity is also for judging whether PDCP COUNT value is greater than triggering thresholding, and the average transmission and the processing delay that wherein trigger the velocity maximum of thresholding and data on little base station user face and little base station and macro base station are associated; If PDCP COUNT value is greater than triggering thresholding, then send key updating request to macro base station chain of command entity.
16. systems according to claim 12, is characterized in that,
Macro base station chain of command entity is also for receiving after little base station key that little base station user face entity sends is updated successfully response, be updated successfully according to little base station key the key updating request sequence number that response comprises, judge whether that this key updating request is provided by mobile management entity; If determine, this key updating request is provided by mobile management entity, then send key updating success feedback information to mobile management entity.
17. systems according to claim 11, is characterized in that,
Described key updating notice comprises and needs the carrier identification of more new key, need the cell ID of more new key, the more new key that is associated with cell ID and configuration information, the PRACH configuration information be associated with cell ID, the new user ID that is associated with cell ID.
18. systems according to claim 17, is characterized in that,
Described terminal also for after receiving key updating notice, identifies that key updating notifies the type of cell ID and the carrier identification comprised; If cell ID and carrier identification are little base station carrier mark, the then described terminal described more new key that utilizes key updating to notify to comprise and configuration information, the more key in the auxiliary user face of new terminal, and reset terminal auxiliary user face parameter; If cell ID and carrier identification are macro base station, main server carrier identifies, then utilize the key updating of predetermined switching within cell flow performing macro base station main carrier.
19. systems according to claim 18, is characterized in that,
Described terminal also for the described new user ID that utilizes key updating to notify to comprise and PRACH configuration information, little base station carrier carries out Stochastic accessing; After complete Stochastic accessing on little base station, complete message to the key updating of macro base station chain of command entity transmitting terminal.
20. systems according to claim 19, is characterized in that,
Described terminal also for when access network first, reports described terminal whether to have the function be simultaneously connected with little base station user face and macro base station user face to macro base station chain of command.
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