CN104519486B - Method and system for wireless side key updating in heterogeneous network - Google Patents

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

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Publication number
CN104519486B
CN104519486B CN201310453250.6A CN201310453250A CN104519486B CN 104519486 B CN104519486 B CN 104519486B CN 201310453250 A CN201310453250 A CN 201310453250A CN 104519486 B CN104519486 B CN 104519486B
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base station
terminal
key
key updating
small base
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CN104519486A (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]

Abstract

The present invention discloses a kind of method and system for being used for wireless side key updating in heterogeneous network.Wherein in for heterogeneous network in the method for wireless side key updating, macro base station controls face entity after key updating request is received, carry out key updating, and send key updating notice to corresponding terminal, so that the terminal carries out key updating after key updating notice is received, and terminal key renewal completion message is sent to macro base station control face entity after small base station is accessed；Also update instruction notice is sent to small base station user face entity, so that small base station user face entity carries out corresponding configuration according to update instruction notice for key updating, small base station user face entity is after the terminal is successfully accessed network, key updating and the renewal of small base station user face parameter configuration are carried out, and sends small base station key to macro base station control face entity and is updated successfully response.So as to efficiently solve the problems, such as the key updating in heterogeneous network under chain of command and user plane separate condition.

Description

Method and system for wireless side key updating in heterogeneous network
Technical field
It is more particularly to a kind of to be used for the method for wireless side key updating in heterogeneous network and be the present invention relates to the communications field System.
Background technology
As user is to LTE（Long Term Evolution, Long Term Evolution）The rising of network capacity and covering demand, It certainly will need to introduce small base station in following LTE network（Small Cell）Covered with absorbing traffic and enhancing, corresponding network It is topological as shown in Figure 1.But the introducing of the small base station of tradition can increase interference between node and for end to a certain extent Hold ambulant generation negative impact.In 3GPP（The3rd Generation Partnership Project, the third generation Partner program）In the research on standard of R12, Small Cell Enhancement（Small base station enhancing, referred to as：SCE）Subject under discussion Mainly study the relevant issues such as capacity and mobility in heterogeneous network.Primary study user plane and chain of command in the research topic Separated framework, corresponding framework is as shown in Fig. 2, small base station only carries out terminal user the transmission of data surface, and in macro base station Carry out the transmission of user plane and chain of command.This kind of mode is referred to as dual link（Dual Connection）, in same frequency deployment scenario Lower interference of the reduction for macro base station control channel, and can simultaneously effective be carried using the resource of macro base station and small base station The handling capacity of high terminal and the switching frequency between base station is reduced, improve user's impression.
Still without the user plane and chain of command framework for determining small base station in current SCE subjects under discussion, it is contemplated that return link The design of time delay and terminal protocol stack is convenient, and the small base station that the present invention mainly discusses has a full set of user plane framework, grand base Stand and receiving IP（Internet Protocol, Internet protocol）Forward partial data is into small base station after data packet.It is and small The RRC of base station（Radio Resource Control, wireless heterogeneous networks）Function is located at macro base station, and corresponding protocol stack is as schemed Shown in 3.
The encryption of base station side and decryption and integrity protection are all by PDCP in LTE and LTE_A systems（Packet Data Convergence Protocol, Packet Data Convergence Protocol）Layer safeguarded, and the key of base station side usually with PCI（Physical Cell Identity, Physical Cell Identifier）, base station down frequency point number EARFCN DL have relation, for In R11 and version before, the data splitting point of carrier aggregation is located at MAC（Medium Access Control, media connect Enter control）Layer, due to there was only one PDCP layers, and the control message of terminal is only positioned on main carrier, therefore only needs to safeguard A set of key.
R11 and before version LTE system in key replace and have following several situations：
[1] X2 switching after the completion of for the replacement key for ensureing security and carrying out；
[2] base station sides are in order to avoid with identical RB（Radio Bearer, radio bearer）Mark is with identical KeNB's The reuse of COUNT values and the key updating triggered；
[3] .MME triggers key updating caused by user's context modification.
Above-mentioned key is replaced all takes switching within cell in base station side（intra-cell handover）Carry out key Renewal.Base station side realizes although the flow of switching within cell is an off-gauge process.But its basic procedure is base station After side sends RRC connection reconfiguration message to terminal, since terminal then can be linked into this again through random access procedure Base station.PDCP, RLC of base station side（Radio Link Control, wireless spread-spectrum technology）, MAC layer is to the number that has been received by According to and the data that will send all there may be the processing method different from other switching types.Cell switches in base station side Flow is realized as shown in figure 4, wherein：
Step 1：PDCP or MME（Mobility Management Entity, mobile management entity）Trigger in base station RRM（Radio Resource Management, wireless resource management）Module initiates Intra-Cell Handover procedures.Such as signaling disappears Cease for O_PDCPRRC_COUNT_ROUNF_IND.
Step 2：RRM modules recalculate key, such as the definition in agreement TS33.401 is calculated.
Step 3：The rrc layer transmission connection reconfiguration that RRM sends base station puts request, starts switching within cell.Such as signaling disappears Cease for O_RRCCFG_REQ.
Step 4：The rrc layer of base station sends RRC reconfiguration request messages to terminal, new delivering key to terminal, and Instruction terminal passes through random access procedure again access system.Such as signaling message is O_RRCPDCP_DATA_REQ.
Step 5：RRC indicates that PDCP layers carry out switching in cell switching, and PDCP needs to carry out relevant resource preparation.Such as Signaling is O_RRCPDCP_INTRA_CELL_HO_REQ.
Step 6：What RLC received PDCP layers of instruction re-establishes instruction message, and rlc layer needs to wait bottom to complete relevant heavy After matching somebody with somebody, follow-up feedback operation is performed.Such as signaling message is O_PDCPRLC_RESTABLISH_REQ.
Step 7：Rrc layer instruction MAC layer is directly reset.Such as signaling message is O_RRCMAC_REST_REQ.
Step 8：UE random access, request distribution CRNTI.Such as signaling message is O_SDMAC_UPPS_IND.
Step 9-10：RRM modules redistribute CRNTI, and the result is notified terminal using the MSG2 of random access. Such as signaling message is respectively O_MACRRM_CRNTI_ALLOC_REQ and O_RRMMAC_CRNTI_ALLOC_RSP.
Step 11：Base station physical layer（PHY）The RRC connection reconfigurations for receiving UE put completion message.Such as signaling message is O_CCMAC_DATA_IND(MSG3&CRNTI)。
Step 12：The UE of MAC notice RLC switching within cell completes access.Such as signaling message is O_MACRLC_CRNTI_ IND.After RLC receives the message, judge whether the UE is carrying out switching within cell according to the switching within cell information of preservation, such as Fruit is then to re-establish all built RB, and is returned to PDCP and re-establish confirmation message, while the switching within cell handled is believed Breath is deleted.
Step 13：MAC sends RRC connection reconfigurations to RLC and puts completion message.Such as signaling message is O_MACRLC_DATA_ IND。
Step 14：The UE of RLC notice PDCP switching within cell completes access.Such as signaling message is O_RLCPDCP_ RESTABLISH_CNF。
Rlc layer remains cell handover information, waits the instruction of MAC layer to carry out all weights for having established RB of the user again Build.Wherein for TM（Transparent Mode, transparent mode）RLC transmitting terminal entities, abandon all RLC SDU （Service Data Unit, service data unit）, and all correlated variables of the entity are initialized, for UM （Unacknowledge Mode, Unacknowledged Mode）RLC transmitting terminal entities, abandon all RLC SDU, when stopping all Clock, initializes all state variables, for UM RLC receiving terminal entities, recombinates RLC PDU all in current buffer （Protocol Data Unit, protocol Data Unit）, and the RLC SDU recombinated out are submitted to upper strata, and stop all Clock and all state variable of initialization；For AM（Acknowledge Mode, affirmation mode）RLC entities, restructuring All AMD PDU in rx-side buffering area（Acknowledged Mode Data Protocol DataUnit, affirmation mode Data cell）, AMD PDU Segment, and the RLC SDU recombinated out are submitted to upper strata；Abandon all RLC of receiving terminal PDU（Including data PDU and control PDU）, all RLC SDU of transmitting terminal are abandoned, and stop all clocks and initial Change all state variables.
Step 15：RLC sends RRC connection reconfigurations to PDCP and puts completion message.In the upstream direction, RLC passes through O_ The RLC SDU recombinated out are submitted to PDCP by RLCPDCP_DATA_IND message.
Step 16：RRM modules send RRC connection reconfigurations and put completion message.Such as signaling message is O_PDCPRRC_DATA_ IND(RRC Connection Reconfigure Complete)。
Step 17：RRM modules instruction PDCP completes switching, and PDCP modules perform relevant rearrangement program process.Such as signaling Message is O_RRCPDCP_HO_COMPLETE.
Step 18：RRC notice RRM modules complete RRC connection reconfigurations and put completion.Such as signaling message is O_RRCRRM_ RECFG_RSP。
If however, key before heterogeneous network continues to continue to use R11 safeguard and update mode there will be following to ask Topic：
1st, two base stations will bring security breaches using same set of key：Macro base station and small base station in actual network deployment There are PCI and downlink frequency point number all to have differences, and all have complete user plane, therefore a set of key is configured to Larger change occurs for the encryption and decryption system that two base stations may result in LTE wireless sides, and many safety may be brought hidden Suffer from.
2nd, Current protocol does not support the key of secondary carrier to replace：When need carry out key updating when, current LTE and Switching behavior is occurred on main carrier in LTE_A air protocols, therefore only supports the key updating of main carrier, can not be supported The key updating of secondary carrier.Therefore method before R12 can not be applied to the scene of heterogeneous network dual link.
3rd, can not be that each small base station configures unified key replacement thresholding：In order to anti-in LTE and LTE_A systems Only PDCP COUNT values are there is a situation where overturning, usually by OMC（Operation ＆ Maintenance Center, operation dimension Shield center）Or base station algorithm sets a COUNT values thresholding to be used to trigger key replacement, the PDCP when reaching the thresholding in advance Module request RRM modules recalculate key, and the transmission time between inside of base station modules is very small, therefore mould Response between block is relatively timely.And in heterogeneous environment due in actual deployment process the PDCP modules of small base station with it is grand Between the RRM modules of base station carried by IP backbone links, rather than the mode of data/address bus, therefore necessarily deposit larger Propagation delay time, and difference DRB（Data Radio Bearer, Data Radio Bearer）The transmission rate of carrying is also different, So if set a larger PDCP COUNT values upset thresholding then there may be the new key updating of macro base station feedback it Before, the PDCP COUNT values of small base station just have occurred and that upset so as to bring safety issue, and if setting less PDCP COUNT values upset thresholding may cause multiple key updating, so as to waste substantial amounts of space interface signaling.
The content of the invention
The embodiment of the present invention provides a kind of method and system for being used for wireless side key updating in heterogeneous network, efficiently solves Key updating problem in heterogeneous network under chain of command and user plane separate condition.
According to an aspect of the present invention, there is provided a kind of method for being used for wireless side key updating in heterogeneous network, including：
Macro base station controls face entity to extract terminal iidentification from key updating request after key updating request is received；
Macro base station control face entity carries out key updating and calculates with the key after being updated；
Macro base station controls face entity to send key updating notice to terminal corresponding with terminal iidentification；So that the terminal exists Key updating is carried out after receiving key updating notice, and it is close to macro base station control face entity transmission terminal after small base station is accessed Key updates completion message；
Macro base station controls face entity to send update instruction notice to small base station user face entity, so that small base station user face is real Body carries out corresponding configuration according to update instruction notice for key updating；
Small base station user face entity carries out key updating and small base station user face ginseng after the terminal is successfully accessed network Number config update, and send small base station key to macro base station control face entity and be updated successfully response.
Preferably, key updating request is by small base station user face entity, mobile management entity or macro base station user entity Send.
Preferably, macro base station control face entity carry out the step of key updating is calculated with key after being updated it Afterwards, further include：
Judge whether key updating request is sent by small base station user face entity or mobile management entity；
If key updating request is sent by small base station user face entity or mobile management entity, judge opposite with terminal iidentification Whether the terminal answered has the function of while is connected with small base station user face and macro base station user plane；
If the terminal has the function of while is connected with small base station user face and macro base station user plane, determine whether Whether there is the carrying associated with the terminal on small base station user face；
If having the carrying associated with the terminal on small base station user face, perform macro base station control face entity to The terminal that terminal iidentification is associated sends the step of key updating notice.
Preferably, if key updating request is not by small base station user face entity or mobile management entity transmission, the end End without on the function that is connected with small base station user face and macro base station user plane at the same time or small base station user face not with it is described During the carrying that terminal is associated, macro base station controls face entity to carry out key updating according to predetermined switching within cell flow.
Preferably, small base station user face entity judges whether PDCP COUNT values are more than trigger threshold, wherein trigger threshold It is associated with the average transmission and processing delay of macro base station with the velocity maximum of data on small base station user face and small base station；
If PDCP COUNT values are more than trigger threshold, small base station user face entity sends close to macro base station control face entity Key renewal request.
Preferably, small base station key is sent to macro base station control face entity be updated successfully response in small base station user face entity The step of after, further include：
Macro base station controls face entity to be updated successfully the key updating for responding and including according to small base station key and asks sequence number, sentences It is disconnected that whether this key updating request is provided by mobile management entity；
If it is determined that this key updating request is provided by mobile management entity, then key updating is sent to mobile management entity Success feedback information.
Preferably, the key updating notice includes carrier identification, the cell of needs more new key of needs more new key Mark, the more new key associated with cell ID and configuration information, the PRACH configuration information associated with cell ID and The new user identifier that cell ID is associated.
Preferably, the terminal includes in the step of progress key updating after receiving key updating notice：
The terminal is after key updating notice is received, cell ID and carrier wave that identification key updating notice includes The type of mark；
If cell ID and carrier identification identify for small base station carrier, the terminal is included using key updating notice The more new key and configuration information, the key of the auxiliary user plane of more new terminal, and reset the auxiliary user plane parameter of terminal；
If cell ID and carrier identification are the main server carrier mark of macro base station, predetermined switching within cell flow is utilized Perform the key updating of macro base station main carrier.
Preferably, the terminal sends terminal key renewal completion to macro base station control face entity after small base station is accessed and disappears The step of breath, includes：
The new user identifier and PRACH configuration informations that the terminal is included using key updating notice, in small base Stand and carry out random access on carrier wave；
After the terminal completes random access on small base station, send terminal key to macro base station control face entity and updated Into message.
Preferably, whether the terminal reports the terminal to have same when accessing network first to macro base station chain of command The function that Shi Yu little base station users face is connected with macro base station user plane.
According to another aspect of the present invention, there is provided a kind of system for being used for wireless side key updating in heterogeneous network, including it is grand Base station, small base station and terminal, macro base station, which includes macro base station control face entity and macro base station user entity, small base station, includes small base Stand user entity, wherein：
Macro base station controls face entity, for after key updating request is received, terminal to be extracted from key updating request Mark, carries out key updating and calculates with the key after being updated；Key updating is sent to terminal corresponding with terminal iidentification to lead to Know；Update instruction notice is sent to small base station user face entity；
The terminal, for carrying out key more after the key updating notice of macro base station control face entity transmission is received Newly, and after small base station is accessed terminal key renewal completion message is sent to macro base station control face entity；
Small base station user face entity, the update instruction for controlling face entity to send according to macro base station notifies, for key Renewal carries out corresponding configuration；After the terminal is successfully accessed network, key updating and small base station user face parameter configuration are carried out Renewal, and send small base station key to macro base station control face entity and be updated successfully response.
Preferably, key updating request is by small base station user face entity, mobile management entity or macro base station user entity Send.
Preferably, macro base station control face entity be additionally operable to carry out key updating calculate with the key after being updated it Afterwards, judge whether key updating request is sent by small base station user face entity or mobile management entity, if key updating request by Small base station user face entity or mobile management entity are sent, judge whether to have with the corresponding terminal of terminal iidentification and meanwhile with it is small The function that base station user face is connected with macro base station user plane, is used with small base station user face and macro base station at the same time if the terminal has The function of family face connection, then determine whether there is the carrying associated with the terminal on small base station user face, if small There is the carrying associated with the terminal on base station user face, then perform to the terminal associated with terminal iidentification and send key The operation of update notification.
Preferably, it is not by small base station user face entity or shifting that macro base station control face entity, which is additionally operable in key updating request, Dynamic management entity is sent, the terminal is without the function or small being connected at the same time with small base station user face and macro base station user plane On base station user face not the carrying associated with the terminal when, carry out key more according to predetermined switching within cell flow Newly.
Preferably, small base station user face entity is additionally operable to judge whether PDCP COUNT values are more than trigger threshold, wherein touching Send out thresholding and the velocity maximum and the average transmission and processing delay of small base station and macro base station of data on small base station user face It is associated；If PDCP COUNT values are more than trigger threshold, key updating request is sent to macro base station control face entity.
Preferably, macro base station control face entity is additionally operable to receiving the small base station key of small base station user face entity transmission After being updated successfully response, sequence number is asked in the key updating that being updated successfully response according to small base station key includes, and judges whether this Secondary key renewal request is provided by mobile management entity；If it is determined that this key updating request is provided by mobile management entity, then Key updating success feedback information is sent to mobile management entity.
Preferably, the key updating notice includes carrier identification, the cell of needs more new key of needs more new key Mark, the more new key associated with cell ID and configuration information, the PRACH configuration information associated with cell ID and The new user identifier that cell ID is associated.
Preferably, the terminal is additionally operable to after key updating notice is received, and identification key updating notice includes The type of cell ID and carrier identification；If cell ID and carrier identification identify for small base station carrier, the terminal utilizes The more new key and configuration information, the key of the auxiliary user plane of more new terminal that key updating notice includes, and reset terminal Auxiliary user plane parameter；If cell ID and carrier identification are the main server carrier mark of macro base station, predetermined intra-cell is utilized Change of current journey performs the key updating of macro base station main carrier.
Preferably, the new user identifier and PRACH that the terminal is additionally operable to include using key updating notice are matched somebody with somebody Confidence ceases, and random access is carried out on small base station carrier；It is real to macro base station chain of command after random access is completed on small base station Body sends terminal key renewal completion message.
Preferably, the terminal is additionally operable to, when accessing network first, whether the terminal is reported to macro base station chain of command Have the function of while be connected with small base station user face and macro base station user plane.
It is of the invention that face entity is controlled after key updating request is received by macro base station, carry out key updating and calculate to obtain Key after to renewal, and key updating notice is sent to corresponding terminal, so that the terminal is led to receiving key updating Key updating is carried out after knowing, and terminal key renewal completion message is sent to macro base station control face entity after small base station is accessed； Update instruction notice also is sent to small base station user face entity, so that small base station user face entity is directed to according to update instruction notice Key updating carry out corresponding configuration, small base station user face entity after the terminal is successfully accessed network, carry out key updating and The parameter configuration renewal of small base station user face, and send small base station key to macro base station control face entity and be updated successfully response.So as to Efficiently solve the problems, such as the key updating under chain of command and user plane separate condition in heterogeneous network.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also To obtain other attached drawings according to these attached drawings.
Fig. 1 is the network topology schematic diagram disposed behind small base station.
Fig. 2 is the schematic diagram of the protocol stack division under user plane and chain of command separation in heterogeneous network.
Fig. 3 is the protocol stack schematic diagram of base station and terminal in the case of dual link.
Fig. 4 is the key updating mode based on cell switching.
Fig. 5 is the schematic diagram of wireless side key updating method one 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 key updating method one embodiment in end side of the present invention.
Fig. 8 is signal of the base station side of the present invention for chain of command and the separated key updating flow one embodiment of user plane Figure.
Fig. 9 is the schematic diagram of wireless side key updating system one embodiment in heterogeneous network of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Below Description only actually at least one exemplary embodiment is illustrative, is never used as to the present invention and its application or makes Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Lower all other embodiments obtained, belong to the scope of protection of the invention.
Unless specifically stated otherwise, the component and positioned opposite, the digital table of step otherwise illustrated in these embodiments Do not limited the scope of the invention up to formula and numerical value.
At the same time, it should be appreciated that for the ease of description, the size of the various pieces shown in attached drawing is not according to reality Proportionate relationship draw.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable In the case of, the technology, method and apparatus should be considered as authorizing part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined, then it need not be further discussed in subsequent attached drawing in a attached drawing.
Fig. 5 is the schematic diagram of wireless side key updating method one embodiment in heterogeneous network of the present invention.
As shown in figure 5, the method and step of the present embodiment is as follows：
Step 501, macro base station control face entity is extracted eventually after key updating request is received from key updating request End mark.
Preferably, key updating request is by small base station user face entity, mobile management entity or macro base station user entity Send.
Preferably, key updating request includes at least：
[1] needs the identification list of the Deta bearer updated
[2] terminal iidentifications
[3] renewals request sequence number
Preferably, small base station user face entity judges whether PDCP COUNT values are more than trigger threshold, wherein trigger threshold It is associated with the average transmission and processing delay of macro base station with the velocity maximum of data on small base station user face and small base station. If PDCP COUNT values are more than trigger threshold, small base station user face entity sends key updating to macro base station control face entity please Ask.
In one embodiment, trigger threshold TH=ThOMC- 2*V* τ, wherein ThOMCRepresent the door that webmaster or algorithm are set Limit, this usual numerical value are less than the maximum PDCP COUNT thresholdings defined in agreement；V=max(DRB1,DRB2,…,DRBN), DRB values in bracket are the speed of Data Radio Bearer on small base station user face；τ be small base station and macro base station average transmission and Processing delay.
Step 502, macro base station control face entity carries out key updating and calculates with the key after being updated.
Step 503, macro base station controls face entity to send key updating notice to terminal corresponding with terminal iidentification；With toilet State terminal and key updating is carried out after key updating notice is received, and to macro base station control face entity hair after small base station is accessed Make arrangements for his funeral and hold key updating completion message.
Preferably, included at least in key updating notice：
Need the carrier identification list with changing key
Need the other list of cell ID with changing key
The key of key cell and the configuration updated is each needed, as included in agreement TS36.331 Part in securityAlgorithmConfig, keyChangeIndicator and nextHopChainingCount or Person is whole
Each PRACH for needing replacing key cell（Physical Random Access Channel, physical accidental Access channel）Configuration information
The new user identifier for each needing replacing key cell is other（Such as C-RNTI（Cell-Radio Network Temporary Identifier, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI））
Step 504, macro base station controls face entity to send update instruction notice to small base station user face entity, so as to small base station User entity carries out corresponding configuration according to update instruction notice for key updating.
Preferably, corresponding configuration includes：PDCP layers obtain new key information and configuration, and rlc layer needs to wait MAC layer After completing relevant re-matching with physical layer, follow-up feedback operation is performed, and MAC layer directly carries out the weight of parameter and timer Put.
Step 505, small base station user face entity carries out key updating and small base station after the terminal is successfully accessed network User plane parameter configuration updates, and sends small base station key to macro base station control face entity and be updated successfully response.
Preferably, the MAC layer of small base station successfully receive terminal be successfully accessed to the request of network after, for user Face data are reset, and the wherein operation of rlc layer remains cell handover information for rlc layer, waits the instruction of MAC layer carrying out All reconstructions for having established RB of the user.Wherein for TM RLC transmitting terminal entities, all RLC SDU are abandoned, and initially Change all correlated variables of the entity, for UM RLC transmitting terminal entities, abandon all RLC SDU, stop all clocks, All state variables are initialized, for UM RLC receiving terminal entities, recombinate RLC PDU all in current buffer, and will The RLC SDU recombinated out are submitted to upper strata, and stop all clocks and initialize all state variables；For AM RLC entities, recombinate AMD PDU, AMD PDU Segment all in rx-side buffering area, and the RLC SDU recombinated out are passed Give upper strata；Abandon all RLC PDU of receiving terminal（Including data PDU and control PDU）, abandon all RLC of transmitting terminal SDU, and stop all clocks and initialize all state variables.
Preferably, small base station key is updated successfully a part of the response including at least following information：
[1] terminal iidentifications
[2] Deta bearers identify
[3] key updatings request sequence number
Wireless side key updating method in the heterogeneous network provided based on the above embodiment of the present invention, macro base station control face entity After key updating request is received, carry out key updating and calculate with the key after update, and to the transmission of corresponding terminal Key updating notifies, so that the terminal carries out key updating after key updating notice is received, and after small base station is accessed Terminal key renewal completion message is sent to macro base station control face entity；Also update instruction is sent to small base station user face entity to lead to Know, so that small base station user face entity carries out corresponding configuration, small base station user face according to update instruction notice for key updating Entity carries out key updating and the renewal of small base station user face parameter configuration after the terminal is successfully accessed network, and to grand base Stand control face entity sends small base station key and is updated successfully response.So as to efficiently solve chain of command and user plane point in heterogeneous network From the key updating problem under situation.
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 fig. 6, this The method and step of embodiment is as follows：
Step 601, macro base station control face entity is extracted eventually after key updating request is received from key updating request End mark.
Step 602, macro base station control face entity carries out key updating and calculates with the key after being updated.
Step 603, judge whether key updating request is sent by small base station user face entity or mobile management entity.It is if close Key renewal request is sent by small base station user face entity or mobile management entity, then performs step 605；Otherwise, step is performed 604。
Step 604, macro base station control face entity carries out key updating according to predetermined switching within cell flow.Afterwards, no Other steps of the present embodiment are performed again.
For example, key updating mode that can be as shown in Figure 4 carries out key updating.
Step 605, judge with the corresponding terminal of terminal iidentification whether have at the same time with small base station user face and macro base station The function of user plane connection.If the terminal has the function of while is connected with small base station user face and macro base station user plane, Perform step 606；Otherwise, step 604 is performed.
Step 606, judge whether there is the carrying associated with the terminal on small base station user face.If small base station user There is the carrying associated with the terminal on face, then perform step 607；Otherwise, step 604 is performed.
Step 607, macro base station controls face entity to send key updating notice to terminal corresponding with terminal iidentification；With toilet State terminal and key updating is carried out after key updating notice is received, and to macro base station control face entity hair after small base station is accessed Make arrangements for his funeral and hold key updating completion message.
Step 608, macro base station controls face entity to send update instruction notice to small base station user face entity, so as to small base station User entity carries out corresponding configuration according to update instruction notice for key updating.
Step 609, small base station user face entity carries out key updating and small base station after the terminal is successfully accessed network User plane parameter configuration updates, and sends small base station key to macro base station control face entity and be updated successfully response.
Step 610, macro base station control face entity is updated successfully the key updating for responding and including according to small base station key and asks Sequence number is sought, judges whether that this key updating request is provided by mobile management entity.
Step 611, however, it is determined that this key updating request is provided by mobile management entity, then is sent to mobile management entity Key updating success feedback information.
Fig. 7 is the schematic diagram of key updating method one embodiment in end side of the present invention.As shown in fig. 7, above-mentioned terminal exists Receiving the step of carrying out key updating after key updating notifies includes：
Step 701, terminal is after key updating notice is received, the identification key updating cell ID that includes of notice and The type of carrier identification.If cell ID and carrier identification identify for small base station carrier, step 702 is performed；If cell ID It is the main server carrier mark of macro base station with carrier identification, then performs step 703.
Step 702, the more new key and configuration information, more new terminal that terminal is included using key updating notice are auxiliary The key of user plane, and reset the auxiliary user plane parameter of terminal.Then step 704 is performed.
Step 703, the key updating of macro base station main carrier is performed using predetermined switching within cell flow.
For example, carry out key updating using the key updating mode shown in Fig. 4.
Step 704, the new user identifier and PRACH configuration informations that terminal is included using key updating notice, Random access is carried out on small base station carrier.
Step 705, after terminal completes random access on small base station, terminal key is sent more to macro base station control face entity New completion message.
Preferably, terminal first access network when, to macro base station chain of command report the terminal whether have at the same time with The function that small base station user face is connected with macro base station user plane.
Fig. 8 is signal of the base station side of the present invention for chain of command and the separated key updating flow one embodiment of user plane Figure.As shown in figure 8, the specific journey step of chain of command key updating stream separated with user plane is as shown in Blocked portion in figure.Wherein：
Step 21：RRM modules in S-PDCP triggerings base station initiate Intra-Cell Handover procedures.Such as signaling message is O_ PDCPRRC_COUNT_IND。
Step 22：RRM modules recalculate key.
Step 23：The rrc layer transmission connection reconfiguration that RRM sends base station puts request, starts switching within cell.Such as signaling disappears Cease for O_RRCCFG_REQ.
Step 24：The rrc layer of base station sends RRC reconfiguration request messages to P-PHY, new delivering key to terminal, And instruction terminal passes through random access procedure again access system.
Step 25：S-PDCP layers of RRC instructions carry out switching in cells switching, and S-PDCP needs to carry out relevant resource standard It is standby.Such as signaling is O_RRCPDCP_INTRA_CELL_HO_REQ.
Step 26：What S-RLC received S-PDCP layers of instruction re-establishes instruction message, and S-RLC layer need to wait bottom completion After relevant re-matching, follow-up feedback operation is performed.Such as signaling message is O_PDCPRLC_ESTABLISH_REQ.
Step 27：Rrc layer indicates S-MAC layers and is directly reset.Such as signaling message is O_RRCMAC_REST_REQ.
Step 28：UE random access, request distribution CRNTI.Such as signaling message is O_SDMAC_UPPS_IND.
Step 29：The RRC connection reconfigurations that S-PHY receives UE put completion message.Such as signaling message is O_CCMAC_ DATA_IND(MSG3&CRNTI)。
Step 30：The UE of S-MAC notice S-RLC switching within cell completes access, and sends RRC connection reconfigurations to S-RLC Put completion message.Such as signaling message is O_MACRLC_IND.
Step 31：The UE of S-RLC notice S-PDCP switching within cell completes access.Such as signaling message is O_RLCPDCP_ ESTABLISH_CNF。
Step 32：P-PHY sends RRC connection reconfigurations to RRC and puts completion message.
Step 33：RRM modules instruction S-PDCP completes switching, and S-PDCP modules perform relevant rearrangement program process.Such as Signaling message is O_RRCPDCP_HO_COMPLETE.
Step 34：RRC notice RRM modules complete RRC connection reconfigurations and put completion.Such as signaling message is O_RRCRRM_ RECFG_RSP。
Fig. 9 is the schematic diagram of wireless side key updating system one embodiment in heterogeneous network of the present invention.As shown in figure 9, should System includes macro base station 91, small base station 92 and terminal 93, and macro base station 91 includes macro base station control face entity 911 and macro base station user Face entity 912, small base station 92 include small base station user face entity 921.Wherein：
Macro base station controls face entity 911, for after key updating request is received, being extracted eventually from key updating request End mark, carries out key updating and calculates with the key after being updated；Key is sent to terminal 93 corresponding with terminal iidentification more New notice；Update instruction notice is sent to small base station user face entity 921.
The terminal 93, it is close for being carried out after the key updating notice of the macro base station control transmission of face entity 911 is received Key updates, and sends terminal key renewal completion message to macro base station control face entity 911 after small base station is accessed.
Small base station user face entity 921, for controlling the update instruction notice of the transmission of face entity 911, pin according to macro base station Corresponding configuration is carried out to key updating；After the terminal is successfully accessed network, key updating and small base station user face ginseng are carried out Number config update, and send small base station key to macro base station control face entity 911 and be updated successfully response.
Wireless side key updating system in the heterogeneous network provided based on the above embodiment of the present invention, macro base station control face entity After key updating request is received, carry out key updating and calculate with the key after update, and to the transmission of corresponding terminal Key updating notifies, so that the terminal carries out key updating after key updating notice is received, and after small base station is accessed Terminal key renewal completion message is sent to macro base station control face entity；Also update instruction is sent to small base station user face entity to lead to Know, so that small base station user face entity carries out corresponding configuration, small base station user face according to update instruction notice for key updating Entity carries out key updating and the renewal of small base station user face parameter configuration after the terminal is successfully accessed network, and to grand base Stand control face entity sends small base station key and is updated successfully response.So as to efficiently solve chain of command and user plane point in heterogeneous network From the key updating problem under situation.
For convenience's sake, a small base station and a terminal be illustrate only in fig.9, those skilled in the art can be with Solution, macro base station can be interacted with Multiple Small Cell Sites and multiple terminals at the same time.
Preferably, key updating request is by small base station user face entity, mobile management entity or macro base station user entity Send.
Preferably, macro base station control face entity 911 is additionally operable to calculate with the key after being updated carrying out key updating Afterwards, judge whether key updating request is sent by small base station user face entity or mobile management entity, if key updating is asked Sent by small base station user face entity or mobile management entity, judge with the corresponding terminal of terminal iidentification whether have at the same time with The function that small base station user face is connected with macro base station user plane, if the terminal have at the same time with small base station user face and macro base station The function of user plane connection, then determine whether there is the carrying associated with the terminal on small base station user face, if There is the carrying associated with the terminal on small base station user face, then perform close to the terminal transmission associated with terminal iidentification The operation of key update notification.
Preferably, it is not by small base station user face entity that macro base station control face entity 911, which is additionally operable in key updating request, Or mobile management entity send, the terminal without at the same time be connected with small base station user face and macro base station user plane function, Or on small base station user face not the carrying associated with the terminal when, carry out key according to predetermined switching within cell flow Renewal.
Preferably, small base station user face entity 921 is additionally operable to judge whether PDCP COUNT values are more than trigger threshold, wherein In trigger threshold and small base station user face when the average transmission and processing of the velocity maximum of data and small base station and macro base station Prolong associated；If PDCP COUNT values are more than trigger threshold, key updating request is sent to macro base station control face entity 911.
Preferably, macro base station control face entity 911 is additionally operable to receiving the small base station of small base station user face entity transmission After key updating success response, sequence number is asked in the key updating that being updated successfully response according to small base station key includes, and judgement is No this key updating request is provided by mobile management entity；If it is determined that this key updating request is carried by mobile management entity For then sending key updating success feedback information to mobile management entity.
Preferably, the key updating notice includes carrier identification, the cell of needs more new key of needs more new key Mark, the more new key associated with cell ID and configuration information, the PRACH configuration information associated with cell ID and The new user identifier that cell ID is associated.
Preferably, the terminal 93 is additionally operable to after key updating notice is received, and identification key updating notice includes Cell ID and carrier identification type；If cell ID and carrier identification identify for small base station carrier, the terminal profit More new key and configuration information described in key updating notifies to include, the key of the auxiliary user plane of more new terminal, and reset end Hold auxiliary user plane parameter；If cell ID and carrier identification are the main server carrier mark of macro base station, using in predetermined cell Switching flow performs the key updating of macro base station main carrier.
Preferably, the terminal 93 is additionally operable to the new user identifier and the PRACH included using key updating notice Configuration information, carries out random access on small base station carrier；After random access is completed on small base station, to macro base station chain of command Entity sends terminal key renewal completion message.
Preferably, the terminal 93 is additionally operable to, when accessing network first, report the terminal to be to macro base station chain of command It is no to have the function of while be connected with small base station user face and macro base station user plane.
Below by specific example, the present invention will be described.
Embodiment 1：
The PDCP layers that the present embodiment mainly describes small base station eNB 2 trigger key updating process, and macro base station eNB1 performs phase The key updating process of pass.Wherein network topology is as shown in Figure 1.Terminal UE has doubly-linked connection function, in macro base station eNB1 and small Base station eNB 2 has carrying, wherein in macro base station eNB1 be DRB1, the DRB2 in small base station eNB 2, the terminal it is all SRB carrying be all located at macro base station.
Step 1：The change of the COUNT values of the DRB2 of small 2 PDCP layers of monitor terminal user of user plane of base station eNB, works as discovery After the transmission rate of current COUNT values+small base station eNB 2 to macro base station eNB1 time delay * 2*DRB2 exceed pre-determined threshold, small base The eNB2 user that stands belongs to macro base station eNB1 towards it and sends key replacement instruction message.Have in being included in message：
[1] terminal iidentifications
[2] Deta bearers identify
[3] key updatings request sequence number
Step 2：The small base station of macro base station eNB1 discovery terminal supports and the function of macro base station dual link, and terminal user The DRB2 of carrying is present in small base station eNB 2, therefore triggers the key updating process of small base station.
Step 3：Macro base station eNB1 sends message RRC Connection Reconfiguration notices by macro base station Terminal key updates, and includes following information in message in addition to necessary information in R11：
The carrier identification of eNB2
The other PCI of the cell ID of eNB2
The key of the key cell of eNB2 and configuration
The new PRACH configuration informations of eNB2
The other C-RNTI of new user identifier of eNB2
Step 4：Macro base station eNB1 indicates that small base station eNB 2 is prepared for that will carry out key updating, and wherein PDCP layers is obtained Key information newly and configuration are obtained, rlc layer is needed after waiting bottom to complete relevant re-matching, performs follow-up feedback operation, And MAC layer directly carries out the replacement of parameter and timer.
Step 5：The MAC layer of small base station eNB 2 successfully receive terminal be successfully accessed to the request of network after, for User face data is reset, and the wherein operation of rlc layer remains cell handover information for rlc layer, waits the instruction of MAC layer to exist Carry out all reconstructions for having established RB of the user.Wherein for TM RLC transmitting terminal entities, all RLC SDU are abandoned, and All correlated variables of the entity are initialized, for UM RLC transmitting terminal entities, all RLC SDU is abandoned, stops all Clock, initializes all state variables, for UM RLC receiving terminal entities, recombinates RLC PDU all in current buffer, And the RLC SDU recombinated out are submitted to upper strata, and stop all clocks and initialize all state variables；For AM RLC entities, recombinate AMD PDU, AMD PDU Segment all in rx-side buffering area, and the RLC that will be recombinated out SDU is submitted to upper strata；Abandon all RLC PDU of receiving terminal（Including data PDU and control PDU）, it is all to abandon transmitting terminal RLC SDU, and stop all clocks and initialize all state variables.
Step 6：Terminal feedback message RRC Connection Reconfiguration Complete on eNB1, are used Succeed in instruction macro base station key updating.
Step 7：The user plane of small base station eNB 2 is after new key and parameter configuration is updated, the control to macro base station eNB1 Face processed indicates key updating success response.Be updated successfully in response message included at least it is some or all of in following message：
[1] terminal iidentifications
[2] Deta bearers identify
[3] key updatings request sequence number
Embodiment 2：
The PDCP layers that the present embodiment mainly describes small base station eNB 2 trigger key updating process, and end side UE performs correlation Key updating process.Wherein network topology is as shown in Figure 1, terminal UE has doubly-linked connection function, in macro base station eNB1 and small base The eNB2 that stands has carrying, wherein in macro base station eNB1 be DRB1, the DRB2 in small base station eNB 2, the terminal it is all SRB carryings are all located at macro base station.
Step 1：Terminal UE receives the RRC information UECapabilityEnquiry of base station side when accessing network, it is desirable to Terminal reporting ability.
Step 2：Terminal using RRC information UECapabilityInformation to network-feedback terminal capability, in ability It is used to indicate that UE supports doubly-linked connection function comprising a bit.
Step 3：Terminal receives the RRC information RRC Connection Reconfiguration of macro base station eNB1 transmissions, The message contains following information：
The carrier identification of eNB2
The other PCI of the cell ID of eNB2
The key of the key cell of eNB2 and configuration
The new PRACH configuration informations of eNB2
The other C-RNTI of new user identifier of eNB2
Step 4：Terminal resets auxiliary user plane according to the regulation in R11 agreements, the new key that Configuration network issues, and According to the PRACH information and C-RNTI of the instruction of base station, random access is carried out on eNB2.
Step 5：After completing random access on eNB2, terminal sends RRC Connection on eNB1 Reconfiguration Complete message, for notifying its key of base station to replace successfully.
Embodiment 3：
The present embodiment mainly describes the macro base station eNB1 of MME triggerings and small base station eNB 2 carries out key updating process, Macro base station eNB1 performs relevant key updating process.Wherein network topology as shown in Figure 1, terminal UE has doubly-linked connection function, There is carrying in macro base station eNB1 and small base station eNB 2, wherein in macro base station eNB1 being DRB1, in small base station eNB 2 DRB2, all SRB carryings of the terminal are all located at macro base station.
Step 1：Macro base station receives the S1AP message UE CONTEXT MODIFICATION REQUEST of MME transmissions, disappears Macro base station change key is indicated in breath.
Step 2：The small base station of macro base station eNB1 discovery terminal supports and the function of macro base station dual link, and terminal user The DRB2 of carrying is present in small base station eNB 2, therefore triggers the key updating process of small base station and macro base station.
Step 3：Macro base station eNB1 sends message RRC Connection Reconfiguration notices by macro base station Terminal key updates, and includes following information in message in addition to necessary information in R11：
The carrier identification of eNB2
The other PCI of the cell ID of eNB2
The key of the key cell of eNB2 and configuration
The new PRACH configuration informations of eNB2
The other C-RNTI of new user identifier of eNB2
Step 4：Macro base station eNB1 indicates that small base station eNB 2 is prepared for that will carry out key updating, and wherein PDCP layers is obtained Key information newly and configuration are obtained, rlc layer is needed after waiting bottom to complete relevant re-matching, performs follow-up feedback operation, And MAC layer directly carries out the replacement of parameter and timer.
Step 5：Mode of the re-cipher key process in terminal user face with R11 and before in version is identical.
Step 6：The MAC layer of small base station eNB 2 successfully receive terminal be successfully accessed to the request of network after, for User face data is reset, and the wherein operation of rlc layer remains cell handover information for rlc layer, waits the instruction of MAC layer to exist Carry out all reconstructions for having established RB of the user.Wherein for TM RLC transmitting terminal entities, all RLC SDU are abandoned, and All correlated variables of the entity are initialized, for UM RLC transmitting terminal entities, all RLC SDU is abandoned, stops all Clock, initializes all state variables, for UM RLC receiving terminal entities, recombinates RLC PDU all in current buffer, And the RLC SDU recombinated out are submitted to upper strata, and stop all clocks and initialize all state variables；For AM RLC entities, recombinate AMD PDU, AMD PDU Segment all in rx-side buffering area, and the RLC that will be recombinated out SDU is submitted to upper strata；Abandon all RLC PDU of receiving terminal（Including data PDU and control PDU）, it is all to abandon transmitting terminal RLC SDU, and stop all clocks and initialize all state variables.
Step 7：Terminal feedback message RRC Connection Reconfiguration Complete on eNB1, are used Succeed in instruction macro base station key updating.
Step 8：The user plane of small base station eNB 2 is after new key and parameter configuration is updated, the control to macro base station eNB1 Face processed indicates key updating success response.Be updated successfully in response message included at least it is some or all of in following message：
[1] terminal iidentifications
[2] Deta bearers identify
[3] key updatings request sequence number
By applying the present invention, following beneficial effect can be obtained：
[1] key updating method that this patents are proposed is opposite compared with existing wireless side key updating method, can be with It is effective to solve in heterogeneous network that Current protocol support the key updating of small base station to ask under chain of command and user plane separate condition Topic, and ensure that R11 and terminal before can successfully access with consequent compatibility.
[2] is directed to the non-ideal return link between small base station and macro base station, this patent in heterogeneous network and proposes one kind The method that PDCP COUNT values overturn adaptive threshold, can be directed to the setting trigger threshold of different time delay environment self-adaptions, Without manually participating in, the operation cost of operator is reduced.
[3] schemes of the present invention make use of the signaling procedure of current LTE, only increase part message elements, to network side Change it is smaller, therefore there is good exploitativeness.
One of ordinary skill in the art will appreciate that hardware can be passed through by realizing all or part of step of above-described embodiment To complete, relevant hardware can also be instructed to complete by program, the program can be stored in a kind of computer-readable In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
Description of the invention provides for the sake of example and description, and is not exhaustively or by the present invention It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Select and retouch State embodiment and be to more preferably illustrate the principle of the present invention and practical application, and those of ordinary skill in the art is managed The solution present invention is so as to design the various embodiments with various modifications suitable for special-purpose.

Claims (20)

  1. A kind of 1. method for being used for wireless side key updating in heterogeneous network, it is characterised in that including：
    Macro base station controls face entity to extract terminal iidentification from key updating request after key updating request is received；
    Macro base station control face entity carries out key updating and calculates with the key after being updated；
    Macro base station controls face entity to send key updating notice to terminal corresponding with terminal iidentification；So that the terminal is receiving Key updating is carried out after being notified to key updating, and terminal key is sent more to macro base station control face entity after small base station is accessed New completion message；
    Macro base station controls face entity to send update instruction notice to small base station user face entity, so as to small base station user face entity root According to update instruction notice corresponding configuration is carried out for key updating；
    Small base station user face entity carries out key updating and small base station user face parameter is matched somebody with somebody after the terminal is successfully accessed network Renewal is put, and sends small base station key to macro base station control face entity and is updated successfully response.
  2. 2. according to the method described in claim 1, it is characterized in that,
    Key updating request is sent by small base station user face entity, mobile management entity or macro base station user entity.
  3. 3. according to the method described in claim 2, it is characterized in that,
    In macro base station control face entity after key updating calculated with the step of key after being updated, further include：
    Judge whether key updating request is sent by small base station user face entity or mobile management entity；
    If key updating request is sent by small base station user face entity or mobile management entity, judge corresponding with terminal iidentification Whether terminal has the function of while is connected with small base station user face and macro base station user plane；
    If the terminal has the function of while is connected with small base station user face and macro base station user plane, small base is determined whether Whether there is the carrying associated with the terminal in user plane of standing；
    If having the carrying associated with the terminal on small base station user face, perform macro base station control face entity to terminal The associated terminal of mark sends the step of key updating notice.
  4. 4. according to the method described in claim 3, it is characterized in that,
    If key updating request is not without at the same time by small base station user face entity or mobile management entity transmission, the terminal It is not associated with the terminal in the function of being connected with small base station user face and macro base station user plane or small base station user face During carrying, macro base station controls face entity to carry out key updating according to predetermined switching within cell flow.
  5. 5. according to the method described in claim 2, it is characterized in that,
    Small base station user face entity judges whether PDCP COUNT values are more than trigger threshold, wherein trigger threshold and small base station user The velocity maximum of data and small base station are associated with the average transmission and processing delay of macro base station on face；
    If PDCP COUNT values are more than trigger threshold, small base station user face entity sends key more to macro base station control face entity New request.
  6. 6. according to the method described in claim 2, it is characterized in that,
    After small base station user face entity sends the step of small base station key is updated successfully response to macro base station control face entity, Further include：
    Macro base station controls face entity to be updated successfully the key updating for responding and including according to small base station key and asks sequence number, and judgement is No this key updating request is provided by mobile management entity；
    If it is determined that this key updating request is provided by mobile management entity, then key updating success is sent to mobile management entity Feedback information.
  7. 7. according to the method described in claim 1, it is characterized in that,
    The key updating notice includes carrier identification, the cell ID and cell of needs more new key of needs more new key It is the associated more new key of mark and configuration information, the PRACH configuration informations being associated to cell ID, related with cell ID The new user identifier of connection.
  8. 8. the method according to the description of claim 7 is characterized in that
    The terminal includes in the step of progress key updating after receiving key updating notice：
    The terminal is after key updating notice is received, cell ID and carrier identification that identification key updating notice includes Type；
    If cell ID and carrier identification identify for small base station carrier, the institute that the terminal is included using key updating notice More new key and configuration information, the key of the auxiliary user plane of more new terminal are stated, and resets the auxiliary user plane parameter of terminal；
    If cell ID and carrier identification are the main server carrier mark of macro base station, performed using predetermined switching within cell flow The key updating of macro base station main carrier.
  9. 9. according to the method described in claim 8, it is characterized in that,
    The terminal is being wrapped after accessing small base station to the step of macro base station control face entity transmission terminal key renewal completion message Include：
    The new user identifier and PRACH configuration informations that the terminal is included using key updating notice, carry in small base station Random access is carried out on ripple；
    After the terminal completes random access on small base station, send terminal key renewal completion to macro base station control face entity and disappear Breath.
  10. 10. according to the method described in claim 9, it is characterized in that,
    Whether the terminal reports the terminal to have and is used at the same time with small base station when accessing network first, to macro base station chain of command The function that family face is connected with macro base station user plane.
  11. A kind of 11. system for being used for wireless side key updating in heterogeneous network, it is characterised in that including macro base station, small base station and end End, macro base station, which includes macro base station control face entity and macro base station user entity, small base station, includes small base station user face entity, its In：
    Macro base station controls face entity, for after key updating request is received, terminal iidentification to be extracted from key updating request, Key updating is carried out to calculate with the key after being updated；Key updating notice is sent to terminal corresponding with terminal iidentification；To Small base station user face entity sends update instruction notice；
    The terminal, for carrying out key updating after the key updating notice of macro base station control face entity transmission is received, and After small base station is accessed terminal key renewal completion message is sent to macro base station control face entity；
    Small base station user face entity, the update instruction for controlling face entity to send according to macro base station notifies, for key updating Carry out corresponding configuration；After the terminal is successfully accessed network, key updating and the renewal of small base station user face parameter configuration are carried out, And send small base station key to macro base station control face entity and be updated successfully response.
  12. 12. system according to claim 11, it is characterised in that
    Key updating request is sent by small base station user face entity, mobile management entity or macro base station user entity.
  13. 13. system according to claim 12, it is characterised in that
    Macro base station control face entity is additionally operable to after carrying out key updating and calculating with the key after being updated, and judges key more Whether new request is sent by small base station user face entity or mobile management entity, if key updating request is real by small base station user face Body or mobile management entity are sent, judge whether to have with the corresponding terminal of terminal iidentification and meanwhile with small base station user face and grand The function of base station user face connection, if the terminal has the work(being connected at the same time with small base station user face and macro base station user plane Can, then determine whether there is the carrying associated with the terminal on small base station user face, if on small base station user face With the carrying associated with the terminal, then the behaviour that key updating notice is sent to the terminal associated with terminal iidentification is performed Make.
  14. 14. system according to claim 13, it is characterised in that
    It is not by small base station user face entity or mobile management entity that macro base station control face entity, which is additionally operable in key updating request, Send, the terminal does not have the function being connected at the same time with small base station user face and macro base station user plane or small base station user face During the upper not carrying associated with the terminal, key updating is carried out according to predetermined switching within cell flow.
  15. 15. system according to claim 12, it is characterised in that
    Small base station user face entity is additionally operable to judge whether PDCP COUNT values are more than trigger threshold, wherein trigger threshold and small base The velocity maximum of data and small base station are associated with the average transmission and processing delay of macro base station in user plane of standing；If PDCP COUNT values are more than trigger threshold, then send key updating request to macro base station control face entity.
  16. 16. system according to claim 12, it is characterised in that
    Macro base station control face entity is additionally operable to be updated successfully sound in the small base station key for receiving small base station user face entity transmission Ying Hou, the key updating that being updated successfully response according to small base station key includes ask sequence number, judge whether this key updating Request is provided by mobile management entity；If it is determined that this key updating request is provided by mobile management entity, then to mobile management Entity sends key updating success feedback information.
  17. 17. system according to claim 11, it is characterised in that
    The key updating notice includes carrier identification, the cell ID and cell of needs more new key of needs more new key It is the associated more new key of mark and configuration information, the PRACH configuration informations being associated to cell ID, related with cell ID The new user identifier of connection.
  18. 18. system according to claim 17, it is characterised in that
    The terminal is additionally operable to after key updating notice is received, the cell ID and load that identification key updating notice includes The type of ripple mark；If cell ID and carrier identification identify for small base station carrier, the terminal is notified using key updating The more new key and configuration information included, the key of the auxiliary user plane of more new terminal, and reset the auxiliary user plane parameter of terminal； If cell ID and carrier identification are the main server carrier mark of macro base station, grand base is performed using predetermined switching within cell flow The key updating of station owner's carrier wave.
  19. 19. system according to claim 18, it is characterised in that
    The terminal is additionally operable to the new user identifier and the PRACH configuration informations included using key updating notice, small Random access is carried out on base station carrier；After random access is completed on small base station, terminal is sent to macro base station control face entity Key updating completion message.
  20. 20. system according to claim 19, it is characterised in that
    The terminal be additionally operable to first access network when, to macro base station chain of command report the terminal whether have at the same time with it is small The function that base station user face is connected with macro base station user plane.
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