CN102215485A

CN102215485A - Method for guaranteeing safety of multi-carrier switching or reconstructing in multi-carrier communication system

Info

Publication number: CN102215485A
Application number: CN2010101625609A
Authority: CN
Inventors: 黄亚达
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-04-04
Filing date: 2010-04-04
Publication date: 2011-10-12
Anticipated expiration: 2030-04-04
Also published as: CN102215485B

Abstract

The invention discloses a method for guaranteeing safety of multi-carrier switching or reconstructing in a multi-carrier communication system, and the method comprises the following steps: a terminal or a source base station or a switching target base station selects one from a plurality of target cells to serve as a switched main carrier cell or a switching target cell during a switching process, and the terminal uses a parameter of the switched main carrier cell or the switching target cell to compute a terminal safety key; the source base station or the switching target base station uses the parameter of the switched main carrier area or the switching target cell to compute the safety key of the switching target base station, wherein the safety key is corresponding to the terminal; during reconstruction, the terminal and a network side reconstructing target base station respectively compute an authentication code for intercepting the short message integrality; and the authentication code for intercepting the short message integrality at the terminal is in match with that at the reconstructing target base station, and the reconstructing target base station determines the context corresponding to the terminal so as to continue the reconstructing process. The method provided by the invention is simple in configuration and reliable, and can be used for effectively guaranteeing the safety in switching and reconstructing.

Description

Guarantee in the multi-carrier communications systems that multicarrier switches or rebuild the method for fail safe

Technical field

The present invention relates to the mobile communication technology field, relate in particular to and guarantee in the multi-carrier communications systems that multicarrier switches or rebuild the method for safety.

Background technology

As shown in Figure 1, Long Term Evolution (LTE, Long Term Evolution) network is by evolution Universal Terrestrial Radio Access Network (E-UTRAN, Evolved Universal Terrestrial Radio AccessNetwork) and evolution packet switching center (EPC, Evolved Packet Core) form, network presents flattening.EUTRAN links to each other with EPC by the S1 interface.Wherein, EUTRAN is made up of a plurality of interconnective evolution base stations (eNB, Evolved NodeB), connects by X2 interface between each eNB; EPC is made up of Mobility Management Entity (MME, Mobility Management Entity) and service gateway entity (S-GW, Serving Gateway).

In the LTE network system, because subscriber equipment (UE, User Equipment) moves at network's coverage area, may cause the variation of the Serving cell of UE,, need network assistance UE between each sub-district, to switch in order to keep the business continuance of UE, current switching in LTE inside mainly can be divided into according to flow process switches (intra-eNB) in the base station eNB, S1 switches and X2 switches, and wherein the initiator of Qie Huaning is referred to as source, and the purpose side of switching is referred to as target side.

Terminal UE is behind access network, and the base station can indicate UE to start safety (security), after safety (security) starts, just can proceed follow-up business and set up flow processs such as switching.Safety is to be used for guaranteeing that UE connects the integrality of transmitting data and encryption, intercepts and captures or distorts to prevent other people.In order to guarantee UE in switching, in the fail safe of service after switching, UE can enable new key and carries out safeguard protection behind handoff procedure, and its key derivation structure is mainly reflected in the maintenance of Access Layer key K eNB as shown in Figure 2 the Access Layer of eating dishes without rice or wine.

From UE, in each handoff procedure, UE can generate a safe key KeNB*, and it can adopt two kinds of derivation modes, that is:

(1) level derivation mode: KeNB* can be by physical-layer cell identifier (the PhysicalCell Identity of Target cell, PCI), (E-UTRA Absolute RadioFrequency Channel Number-Down Link EARFCN-DL) derives from the Access Layer key K eNB that switches preceding use the downstream frequency of Target cell.Perhaps,

(2) vertically deriving from mode: KeNB* can be by the PCI of Target cell, and (NHNext Hop NH) derives from, and deriving from back KeNB* will use as new KeNB for the EARFCN-DL of Target cell and next jumping key.

UE derives from KeNB* with level derivation mode or vertical derivation mode, depend on next hop count in the switching command (Next hop Chaining Counter, NCC), when NCC did not increase, UE usage level derivation mode derived from KeNB*; When NCC increased, UE used vertical derivation mode to derive from KeNB*.The derivation chain is seen shown in Figure 2, and next jumps NH and next hop count NCC is paired relation, and according to next hop count NCC, it still be that vertical direction derives from KeNB* by level that terminal UE can be understood.

In base station side, as shown in Figure 3, shown the handoff procedure in the base station eNB in the LTE system.Terminal UE is operated in base station eNB 1, and UE measures adjacent sub-district, after satisfying measurement event, to base station eNB 1 reporting measurement reports.Base station eNB 1 judges that according to measurement report the UE needs switch to the sub-district CELL2 under the base station eNB 1, because CELL1 and CELL2 belong to eNB1 control, base station eNB 1 sends RRC (Radio Resource control to terminal UE in CELL1, Radio ResourceControl) reconfiguration message, after terminal is eated dishes without rice or wine to finish and is reshuffled, in CELL2, send switch acknowledgment message, finish the sub-district CELL1 of terminal UE under the base station to the CELL2 handoff procedure to base station eNB 1.Wherein exist in the eNB one group of next that is not used jump and next hop count NH, NCC} to the time, can select the aforementioned vertical derivation mode of stating to carry out the derivation of KeNB*, and the NCC of this NH correspondence is sent to UE by switching command; Otherwise, do not have untapped NH, and NCC} to the time, usage level derivation mode is carried out the derivation of KeNB*, next hop count NCC that next that will be used to derive former KeNB jumped the NH correspondence sends to UE by switching command.After UE derived from according to level derivation mode or vertically derivation mode, eNB used the derivative safe key KeNB* of UE as new KeNB.

In base station side, as shown in Figure 4, shown the switching flow of X2 mouth.Terminal UE is operated in base station eNB 1, and UE measures adjacent sub-district, after satisfying measurement event, to base station eNB 1 reporting measurement reports.Base station eNB 1 judges that according to measurement report the UE needs switch to the sub-district CELL2 under the base station eNB 2, then send handoff request message to eNB2.Base station eNB 2 is returned switching request response and is given base station eNB 1, base station eNB 1 sends the RRC reconfiguration message to terminal UE, terminal sends switch acknowledgment message to base station eNB 2, after base station eNB 2 is received switch acknowledgment message, to MME transmit path handoff request, can be that SGW switches the downlink data transmission path after MME receives, switch to base station eNB 2 from base station eNB 1, MME transmit path handover acknowledge is given base station eNB 2 after finishing, and finishes handoff procedure.

Wherein whether untapped according to having { NH, NCC} still be a level derivation mode to deciding its KeNB* that is target BS derives to be to use vertical derivation mode to source base station.Source base station is right with derivative safe key and next hop count then, and promptly { KeNB*, NCC} is right, sends to target BS by handoff request message.Target BS will directly use KeNB* to use as new KeNB.Target BS is included in switching command with the NCC that receives, and replies to source base station by the transparent vessel in the switching request response, and source base station is transmitted to UE with the switching command in the container.UE selects corresponding derived method to carry out the derivation of KeNB according to the NCC that receives.And in above-mentioned path handoff procedure MME can new calculate a pair of NH, NCC} gives target BS, target BS is received the back deletion, and other is untapped NH, NCC} is right, { NH, NCC} be switching use afterwards to preserve up-to-date receiving.

In base station side, as shown in Figure 5, shown the handoff procedure of S1 mouth.Terminal UE is operated in base station eNB 1, and UE measures adjacent sub-district, after satisfying measurement event, to base station eNB 1 reporting measurement reports.Base station eNB 1 judges that according to measurement report the UE needs switch to the sub-district CELL2 under the base station eNB 2, sends to switch to Mobility Management Entity MME and prepares message, and MME sends handoff request message to eNB2.Base station eNB 2 is returned switching request response and is given Mobility Management Entity MME, and MME sends switching command to base station eNB 1, and base station eNB 1 sends the RRC reconfiguration message to terminal UE, and terminal sends switch acknowledgment message to base station eNB 2, finishes handoff procedure.In the S1 handoff procedure, source base station can not send any key to target BS, and MME will calculate that a pair of new { NH, NCC} is right, sends to target BS by handoff request message.Target BS receive NH, and NCC} to after, use vertical derivation mode to carry out the derivation of KeNB*, and it used as new KeNB.Target BS is included in switching command with the NCC that receives, and replies to MME by the transparent vessel in the switching request response, and MME is transmitted to source base station again, and source base station is transmitted to UE with switching command at last.UE selects corresponding derived method to carry out the derivation of KeNB according to the NCC that receives.

As shown in Figure 6, in LTE because wireless environment or subscriber equipment (UE, User Equipment) in factor affecting such as moving of network's coverage area, the connection that may cause UE takes place unusual, in order to keep the business continuance of UE, UE can initiate RRC (Radio Resource Control, Radio Resource control) connection reconstruction request (RRCConnectionReestablishment Request) again and connect so that rebulid RRC.Terminal sends the request of RRC connection reconstruction to network side EUTRAN, and network side returns RRC connection re-establishment message to terminal, and after rebuilding upright finishing, terminal UE is returned the RRC connection re-establishment to network side and finished message.Being defined under following several situation UE in the current LTE agreement can initiate to rebuild: detected RLF (Radio Link Failure, Radio Link Failure), handoff failure, when failure, bottom detect integrity protection inspection failure or RRC reconfiguration failure when moving from LTE toward different system.

The another one prerequisite of initiating the RRC connection reconstruction is that the safety of Access Layer must be activated, if the fail safe of Access Layer is not activated at this moment, then UE can not carry out above-mentioned RRC connection reconstruction, directly enters Idle state.Receive the RRC connection reconstruction message of UE in the base station eNB of network side after, confirm that by the brachymemma message integrity authentication code (short MAC-I) that message is carried whether this message is from reliable UE.Integrity protection key and the protection algorithm integrallty of short MAC-I by using UE before reconstruction, to use; Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (the Cell Radio Network Temporary Indentity that UE uses before the PCI that use and rebuild message, rebuilds preceding sub-district, the reconstruction; C-RNTI) and the cell ID of rebuilding the sub-district calculate 32 integrality authentication code; wherein 16 of UE intercepting are as brachymemma message integrity authentication code short MAC-I; short MAC-I is carried at and rebuilds in the message, sends to rebuild affiliated base station, sub-district.

In LTE, TDD (time division duplex) sub-district only provides a carrier wave as the up-downgoing transmission, and FDD (Frequency Division Duplexing (FDD)) sub-district only provides a pair of carrier wave (a up and descending carrier) as the up-downgoing transmission.In order to satisfy people to the demand of high bandwidth more, third generation cooperative programme (3GPP, 3rd Generation Partnership Project) new enhancement function has been proposed in the LTE system, be referred to as LTE Advance, be called for short LTE-A, carrier aggregation (CA has been proposed in LTE Advance, Carrier Aggregation) method realizes the purpose of bigger bandwidth, this moment, a sub-district was made up of a plurality of continuous or discrete carrier waves, each carrier wave is called component carrier (CC, the service of multicarrier can be provided for UE Component Carrier), simultaneously.Component carrier can adopt the carrier wave of compatible LTE system, and this carrier wave is called backward compatibility carrier wave (Backwards compatible carrier); Component carrier also can adopt the carrier wave of incompatible existing LTE system, and this carrier wave is called non-backward compatible carrier waves (Non-backwards compatible carrier), this carrier wave can only be LTE Advance UE and more the UE of highest version use; Component carrier can also be an expansion carrier wave (Extension carrier), and this carrier wave can not use separately, needs to use together with other carrier waves that can independently use.

By as seen above-mentioned, in the carrier aggregation sub-district, UE can use several up-link carriers and descending carrier simultaneously, and based on current agreement discussion, if target side is the carrier aggregation sub-district in switching, UE can support to switch simultaneously toward a plurality of component carrier CC of target side sub-district.In key derivation, need import the relevant parameter (PCI and EARFCN-DL) of Target cell for the calculating of KeNB*, the relevant parameter (PCI and C-RNTI) that in process of reconstruction, needs the input source sub-district for the calculating of brachymemma message integrity authentication code short MAC-I, and above-mentioned parameter comes from same sub-district in LTE, promptly switching target small area with switch after the former sub-district of reconstruction be identical.In the switching of LTE-A system, cell-of-origin and Target cell may all have several, how should select suitable parameters calculating K eNB* and short MAC-I brachymemma message integrity authentication code this moment, former sub-district whether requirement is rebuild and the Target cell that switches before are same sub-districts, as shown in Figure 7, become the problem that needs solution.

In a plurality of sub-districts of UE configuration, select the output parameter of a sub-district as security parameter, in the discussion of 3GPP, this sub-district is called as particular cell (special cell), simultaneously in order to transmit conveniently, defined main carrier PCC (primary component carrier) sub-district again, PCC is in state of activation always.Based on existing LTE-A framework, probably have 2 schemes to solve above-mentioned safety problem:

Scheme (one): particular cell of separate configurations (special cell), when initially inserting, uses UE the input sub-district of particular cell as security parameter.It can be independent of the work set of cells of UE configuration, or a sub-district in the work set of cells of UE configuration.When the X2 switching took place UE, target BS needed the special cell under the intended target base station, is used for source base station computationally secure key K eNB*.Its benefit is in eNB, the configuration of special cell can be comparatively independent, reduced special cell and changed the reprovision process that need recomputate security parameter, but this process can directly cause the temporary interruption of user face data, and business continuance is had certain influence.Its shortcoming is that UE need safeguard the configuration of special cell separately, and network needs the relevant configuration reconfiguration operation of the new special of establishment cell, thereby causes the behavior of protocol definition comparatively complicated.

Scheme (two): separate configurations special cell not, promptly as specialcell, provide corresponding security parameter with main carrier sub-district PCC, when change takes place each PCC, need upgrade security parameter by handoff procedure.The benefit of this scheme is to simplify configuration and to the definition of agreement behavior, but for the frequent scene of PCC change, might repeatedly cause because user's face that the modification of security parameter causes interrupts.

Therefore,, can cause defectives such as user's face interruption in view of such scheme exists configuration complicated, how simple and reliable guarantee that multicarrier in the multi-carrier communications systems switches or process of reconstruction in fail safe become a technical problem to be solved.

Summary of the invention

Technical problem to be solved by this invention is, provide and guarantee in the multi-carrier communications systems that multicarrier switches or rebuild the method for fail safe, in order to solve to switch or when rebuilding security configuration complicated and cause problems such as user's face rings, simple and reliable assurance to be switched or fail safe when rebuilding easily.

In order to address the above problem, the present invention proposes the method that guarantees the multicarrier switch safety in a kind of multi-carrier communications systems, comprising:

During one or more Target cell that source base station judges that terminal need switch to that the handover-target base station of supporting carrier aggregation has jurisdiction over, from one or more Target cells, select one as main carrier sub-district or switching target small area after switching, in the process that switches to this main carrier sub-district or switching target small area by terminal or source base station or handover-target base station:

The key that terminal utilizes the parameter of main carrier sub-district after this switching or switching target small area to calculate according to key schedule as input parameter is as the terminal security key;

The source base station of network side or handover-target base station are utilized the main carrier sub-district after this switching or the parameter of switching target small area, calculate the safe key corresponding with this terminal as handover-target base station according to the key schedule identical with terminal; Perhaps with the parameter of main carrier sub-district after all possible one or more switchings or switching target small area as input parameter, from the key that calculates according to the key schedule identical with terminal, selected safe key corresponding with this terminal as handover-target base station.

Input parameter when further, described terminal, source base station or handover-target base station are according to identical key schedule computation key also comprises: the safe key of terminal correspondence or next are jumped NH under the source base station;

Described parameter as main carrier sub-district or switching target small area after the switching of input parameter comprises: Physical Cell Identifier, descending carrier frequency.

Between different districts the time, described source base station and described handover-target base station are same base station, promptly are all source base station self in described handoff procedure occurs in same base station;

Source base station is specified one as switching target or main carrier sub-district from a plurality of Target cells, and according to key schedule, with safe key or next jumping NH of terminal correspondence under the source base station, the Physical Cell Identifier of switching target small area and descending carrier frequency calculate safe key corresponding with terminal under the source base station as input parameter; Source base station is notified switching target small area or the main carrier cell information and next the hop count information of terminal appointment in switching command;

Terminal is according to key schedule, use the safe key of terminal correspondence under the source base station or switching target small area or the Physical Cell Identifier of main carrier sub-district and descending carrier frequency calculates terminal as input parameter the safe key of next jumping NH and base station appointment according to next hop count information decision.

Source base station calculates corresponding safe key respectively at a plurality of Target cells, according to key schedule, with safe key or next jumping NH of terminal correspondence under the source base station, the Physical Cell Identifier of each Target cell and descending carrier frequency calculate each Target cell safe key corresponding with terminal under the source base station as input parameter; Perhaps sub-district of source base station appointment is a switching target small area, according to key schedule, with safe key or next jumping NH of terminal correspondence under the source base station, the Physical Cell Identifier of this Target cell and descending carrier frequency calculate this Target cell safe key corresponding with terminal under the source base station as input parameter;

Source base station is notified a plurality of candidates' of terminal Target cell or main carrier cell information in switching command, and next hop count information;

Terminal is selected one as switching target small area or main carrier sub-district from the target complete sub-district, according to key schedule, according to next hop count information, with the safe key of terminal correspondence under the source base station or switching target small area or the Physical Cell Identifier of main carrier sub-district and descending carrier frequency calculates terminal as input parameter the safe key that next is jumped NH and selectes;

After terminal inserts successfully, finish order at switching target small area or the transmission switching of main carrier sub-district, source base station is selection and the corresponding safe key of switching target small area or main carrier sub-district from the safe key of target complete sub-district correspondence, as the safe key corresponding with terminal of base station.

Further, when described handoff procedure occurs between different districts between different base station by the X2 mouth, source base station is specified one as Target cell or main carrier sub-district after switching from a plurality of Target cells that handover-target base station is had jurisdiction over, and according to key schedule, with safe key or next jumping NH of terminal correspondence under the source base station, the Physical Cell Identifier of switching target small area and descending carrier frequency calculate safe key corresponding with terminal under the handover-target base station as input parameter; With Target cell or the main carrier sub-district and the corresponding safe key of this appointment, also have next hop count information to be carried in the handoff request message and send to handover-target base station;

Handover-target base station will with the corresponding safe key in main carrier sub-district as the corresponding safe key of itself and terminal, in returning to the switching command of source base station, carry this Target cell or main carrier cell information and next bar count information, again switching command is sent to terminal by source base station;

Terminal is received switching command, according to key schedule, according to next hop count information, use the safe key of terminal correspondence under the source base station or Target cell or the Physical Cell Identifier of main carrier sub-district and descending carrier frequency calculates terminal as input parameter the safe key of next jumping NH and appointment with decision.

Further, when described handoff procedure occurs between different districts between different base station by the X2 mouth, source base station is each in a plurality of Target cells of having jurisdiction over of handover-target base station, according to key schedule, with safe key or next jumping NH of terminal correspondence under the source base station, the Physical Cell Identifier of each Target cell and descending carrier frequency calculate the safe key corresponding with terminal of each Target cell under the handover-target base station as input parameter; With the information and the corresponding safe key of target complete sub-district, also have next hop count information to be carried in the handoff request message and send to handover-target base station;

Handover-target base station is according to the target complete cell information that is received, therefrom specify one as Target cell or main carrier sub-district, will with the corresponding safe key of Target cell or main carrier sub-district as the corresponding safe key of itself and terminal, in returning to the switching command of source base station, carry this main carrier cell information and next bar count information, again switching command is sent to terminal by source base station;

Terminal is received switching command, according to key schedule, according to next hop count information, with the safe key of terminal correspondence under the source base station or Target cell or the Physical Cell Identifier of main carrier sub-district and descending carrier frequency calculates terminal as input parameter the safe key of next jumping NH and described appointment.

Handover-target base station is carried at the target complete cell information that received and next bar count information and returns to source base station in the switching command, is transmitted to terminal by source base station again;

Terminal is selected one as Target cell or main carrier sub-district from the target complete sub-district, according to key schedule, according to next hop count information, with the safe key of terminal correspondence under the source base station or Target cell or the Physical Cell Identifier of main carrier sub-district and descending carrier frequency calculates terminal as input parameter the safe key that next is jumped NH and selectes;

After terminal inserts successfully, main carrier sub-district after switching sends to switch finishes order, handover-target base station is selected the safe key corresponding with this main carrier sub-district from the safe key of target complete sub-district correspondence, as the safe key corresponding with terminal of handover-target base station.

Further, when described handoff procedure occurs between different districts between different base station by the S1 mouth, specify one in a plurality of Target cells that source base station is had jurisdiction over handover-target base station as Target cell or main carrier sub-district after the switching, inform Mobility Management Entity by switching preparation message, Mobility Management Entity sends handoff request message, and this main carrier cell information and next jumping NH are sent to handover-target base station;

Handover-target base station is jumped NH according to key schedule with next, also has the Target cell of described appointment or the Physical Cell Identifier and the descending carrier frequency of main carrier sub-district to calculate under this base station and the corresponding safe key of terminal as input parameter;

Handover-target base station in switching command, is transmitted to terminal through Mobility Management Entity, source base station with Target cell or main carrier cell information and next hop count information configuration;

Terminal is received switching command, according to key schedule, according to next hop count information, jumps Target cell or the Physical Cell Identifier of main carrier sub-district and descending carrier frequency calculates terminal as input parameter the safe key of NH and described appointment with next.

Further, when described handoff procedure occurred between different districts between different base station by the S1 mouth, the target complete cell information that source base station is had jurisdiction over handover-target base station was prepared message and is informed Mobility Management Entity by switching; Mobility Management Entity sends handoff request message, and target complete cell information and next jumping NH are sent to handover-target base station;

Handover-target base station is at each Target cell, according to key schedule, jump NH with next, also have the Physical Cell Identifier of each Target cell and descending carrier frequency calculates corresponding each Target cell as input parameter the following and corresponding safe key of terminal in this base station;

Handover-target base station is specified one as Target cell or main carrier sub-district from the target complete sub-district, Target cell or main carrier cell information and next hop count information configuration in switching command, are transmitted to terminal through Mobility Management Entity, source base station;

Handover-target base station in switching command, is transmitted to terminal through Mobility Management Entity, source base station with target complete cell information and next hop count information configuration;

Terminal is received switching command, from the target complete sub-district that is received, select one as Target cell or main carrier sub-district, according to key schedule, according to next hop count information, jump NH with next, also have described selected Target cell or the Physical Cell Identifier of main carrier sub-district and descending carrier frequency calculates terminal as input parameter safe key;

Terminal sends switching to handover-target base station and finishes order on the main carrier sub-district after the selected switching, handover-target base station then selects the safe key corresponding with the main carrier sub-district to descend and the corresponding safe key of terminal as this base station.

Further, described method further comprises the steps: after finishing switching

Described terminal is in the following time of handover-target base station of supporting carrier aggregation after finishing switching, if only revise the main carrier sub-district, then in the modification process of main carrier sub-district, keep revising preceding original base station safe key.

The present invention also provides the method that guarantees multicarrier reconstruction fail safe in a kind of multi-carrier communications systems, comprising:

When supporting the main carrier Zone of the source base station of carrier aggregation to need Radio Resource control to rebuild, starting terminal Cell searching, the reconstructed object sub-district of finding the reconstructed object base station of supporting carrier aggregation to be had jurisdiction over;

Terminal is according to the safe key of source base station, the Physical Cell Identifier and the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI of the main carrier sub-district before rebuilding, and the cell ID of reconstructed object sub-district calculates the brachymemma message integrity authentication code of terminal, after inserting at random, the Physical Cell Identifier and the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI of carried terminal brachymemma message integrity authentication code and source base station main carrier sub-district in the Radio Resource control reconstruction request message that the reconstructed object base station sends;

After terminal brachymemma message integrity authentication code coupling is judged in the reconstructed object base station, confirm the context of terminal correspondence, continue process of reconstruction.

Wherein, the reconstructed object base station judges that the concrete steps of terminal brachymemma message integrity authentication code coupling comprise:

Radio Resource control reconstruction request message is received in the reconstructed object base station, obtain the brachymemma message integrity authentication code of terminal, the Physical Cell Identifier and the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI of source base station main carrier sub-district, obtain brachymemma message integrity authentication code with corresponding each terminal of the Physical Cell Identifier of described source base station main carrier sub-district according to the algorithm computation identical with terminal, if the authentication code of the terminal brachymemma message integrity authentication code that wherein has and received coupling, then the context of terminal correspondence is confirmed in the reconstructed object base station, continues process of reconstruction.

Described source base station and reconstructed object base station are same base stations, also can be different base stations.

The method of the switching under the multicarrier system that the present invention proposes or the assurance fail safe of reconstruction has been stipulated the mode of choosing of Target cell or target main carrier sub-district PCC, and the generation rule of security parameter, thereby the influence to the transmission of user's face that the renewal that can farthest reduce security parameter on the one hand causes will be restricted to minimum to the modification of agreement behavior on the other hand.Compared with prior art, main thought is that special cell is incorporated into PCC, do not re-use the notion of special cell, and first PCC that uses the generation switching to go into provides parameter for producing KeNB, after this variation of PCC need not be revised security parameter, when the follow-up generation of UE is rebuild, use last PCC that the calculating parameter of short-MACI is provided, and needn't use the former PCC that produces KeNB.

Description of drawings

Fig. 1 is the E-UTRAN configuration diagram of LTE system;

Fig. 2 is that the safe key when terminal is switched in the LTE system derives from schematic diagram;

Fig. 3 is a handoff procedure schematic diagram in the base station in the LTE system;

Fig. 4 is an X2 handoff procedure schematic diagram in the LTE system;

Fig. 5 is a S1 handoff procedure schematic diagram in the LTE system;

Fig. 6 is a RRC process of reconstruction schematic diagram in the LTE system;

Fig. 7 is the schematic diagram of LTE-A system reconstructing cell selecting;

Fig. 8 is a main carrier sub-district PCC change schematic diagram in the LTE-A system;

Fig. 9 rebuilds the selected schematic diagram that preceding last PCC rebuilds of rebuilding in the LTE-A system.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

In existing LTE-A system, during assurance fail safe when switching or rebuild, there is the complicated and problem that transmission impacts to user's face easily of configuration, proposed to guarantee in the multi-carrier communications systems method of multicarrier switch safety, terminal is when the Target cell that the handover-target base station that switches to the support carrier aggregation is had jurisdiction over, from a plurality of Target cells, select one as main carrier sub-district or switching target small area after switching, in the process that switches to this main carrier sub-district or switching target small area by terminal or source base station or handover-target base station:

The source base station of network side or handover-target base station utilize the parameter of main carrier sub-district after this switching or switching target small area or the main carrier sub-district after all possible one or more switching or switching target small area as input parameter, according to the key that the key schedule identical with terminal calculates, selected safe key corresponding with this terminal as handover-target base station.

Wherein, the computational methods of safe key and existing LTE systems compliant, described terminal, source base station or the handover-target base station input parameter during according to identical key schedule computation key also comprises: the safe key of terminal correspondence or next are jumped NH under the source base station; Described parameter as main carrier sub-district or switching target small area after the switching of input parameter comprises: Physical Cell Identifier, descending carrier frequency.

Described handoff procedure can occur in the same base station between different districts, occur between different districts between different base station by the X2 mouth, occurs between different districts between different base station by the S1 mouth.

Described terminal is in the following time of handover-target base station of supporting carrier aggregation after finishing switching, if revise the main carrier sub-district, then in the modification process of main carrier sub-district, keep revising preceding original base station safe key.

Proposed also to guarantee in the multi-carrier communications systems that multicarrier rebuilds the method for fail safe, when needing Radio Resource control to rebuild, starting terminal Cell searching, the reconstructed object sub-district of finding the reconstructed object base station of supporting carrier aggregation to be had jurisdiction over;

Terminal is according to the safe key of source base station, the Physical Cell Identifier and the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI of source base station main carrier sub-district, and the cell ID of reconstructed object sub-district calculates the brachymemma message integrity authentication code of terminal, after inserting at random, rebuild carried terminal brachymemma message integrity authentication code in the request message to the Radio Resource control that the reconstructed object base station sends, and the Physical Cell Identifier and the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI of source base station main carrier sub-district;

Process of reconstruction also can occur in the different districts under the same base station, and this moment, described source base station and reconstructed object base station were same base stations.

In the specific embodiment of the present invention, the scene of the switching/reconstruction of UE under the carrier aggregation sub-district is described mainly.

Terminal UE is switched the sub-district of anteposition under source base station covers, and source base station S-eNB is the evolution eNB of LTE-Advance, and promptly S-eNB is the base station of supporting carrier aggregation, and its support carrier aggregation sub-district of having jurisdiction over is S-Cell1 and S-Cell2.Handover-target base station T-eNB is the evolution eNB of LTE-Advance, be that T-eNB is the base station of supporting carrier aggregation, sub-district T-Cell1 and T-Cell2 are the sub-district of the carrier aggregation used that T-eNB had jurisdiction over, and T-Cell1 and T-Cell2 also can be called as member carrier when polymerization.Reconstructed object base station R-eNB is the evolution eNB of LTE-Advance, and promptly R-eNB is the base station of supporting carrier aggregation, and sub-district R-Cell1 and R-Cell2 are the sub-district of the carrier aggregation used that R-eNB had jurisdiction over.

Situation with 2 sub-district polymerizations is an example below, under switching or re-construct, how to guarantee that fail safe is elaborated.With reference to the execution mode of 2 sub-districts, the scene of carrier aggregation is carried out in a plurality of sub-districts that also can further derive source and target side.

Embodiment 1: minizone handoff scenario in the base station

Terminal UE is operated under the source base station S-eNB that supports carrier aggregation, and to be configured sub-district S-Cell1 and S-Cell2 that source base station has jurisdiction over be the carrier aggregation sub-district, and wherein sub-district S-Cell1 is as main carrier sub-district PCC.It is the carrier aggregation sub-district that S-Cell3 and S-Cell4 are arranged under the same base in addition, and with S-Cell1 and S-Cell2 adjacent area each other.

Step 101, UE measures adjacent sub-district, and after satisfying measurement event, the UE reporting measurement reports is given source base station S-eNB;

Step 102, source base station S-eNB judges that according to measurement report sub-district S-Cell3 or S-Cell4 that the terminal UE needs switch under the handover-target base station S-eNB go.In such cases, handover-target base station and source base station S-eNB are same base station, promptly are all base station S-eNB.

Step 103, this moment, S-eNB can have 2 kinds of selections for Target cell:

A. PCC is specified in the base station

Specifying the target main carrier sub-district PCC after UE switches in sending to the switching command of terminal is sub-district S-Cell3 or S-Cell4.Can be the appointment of explicit or implicit expression, described implicit expression can be that first component carrier CC of configuration is acquiescence main carrier sub-district PCC.

B. terminal is selected PCC

Intended target main carrier sub-district PCC not in sending to the switching command of terminal, notice UE sub-district S-Cell3 and S-Cell4 can be called main carrier sub-district PCC, UE can own selection one of them as target main carrier sub-district PCC.

For two kinds of above-mentioned key derivations of selecting among a and the b, whether the base station has untapped next jumping and next bar counting { NH according to current base station, which kind of derived method NCC} uses to deciding, if there is not untapped { NH, NCC} is right, and then employing level derives from the mode derivative key, if untapped { NH is arranged, NCC} is right, then adopts vertical derivation mode derivative key.For Target cell parameter PCI and the EARFCN-DL in the derivation history, provide by Target cell or target P CC.

For a, Target cell and the target P CC that chooses can only be calculated in the base station, is example to choose sub-district S-Cell3, when level derives from:

KeNB*＝KeNB* _S-Cell3＝KDF(KeNB _S-eNB，PCI _S-Cell3，EARFCN-DL _S-Cell3)；

During vertical the derivation:

KeNB*＝KeNB* _S-Cell3＝KDF(NH，PCI _S-Cell3，EARFCN-DL _S-Cell3)；

Wherein, KDF is a key schedule; KeNB _S-eNBBe the UE key that source base station S-eNB uses before switching, the corresponding KeNB that generates of its NCC _S-eNBThe time next hop count NCC, work as KeNB _S-eNBBe initial safe process when obtaining, NCC is 0; Next jumps NH is { NH, the NH value of NCC} centering that are not used of preserving in the S-eNB of base station.

For b, base station S-eNB can calculate a key for possible Target cell or target P CC, promptly is respectively sub-district S-Cell3 and S-Cell4 computation key KeNB* _S-Cell3And KeNB* _S-Cell4The method of derivative key is consistent with derivation mode during above-mentioned a selects.

After base station S-eNB finishes configuration, send switching command, wherein carry next hop count NCC of above-mentioned sub-district correspondence to UE.

No matter step 104 after terminal UE is received switching command, is to specify or UE oneself selection by the base station, and final UE can determine a Target cell or target P CC, and inserts at random under this sub-district, sends to switch after inserting successfully to finish order.

For the security parameter configuration, UE is according to the NCC in the switching command, and preceding key K eNB is switched in contrast _UE(KeNB _UE=KeNB _S-eNB) corresponding NCC, if NCC is identical, then UE adopts horizontal derived method derivative key, otherwise uses vertical derived method derivative key, the derived method of key is selected with the LTE systems compliant.The parameter PCI of Target cell and EARFCN-DL come from the sub-district that the order place is finished in UE transmission switching in the key derivation.Press the KDF algorithm and generate KeNB* _UE, and as the KeNB after switching, finish order in switching and bring into use new security parameter.

When step 105, base station are finished order in the switching of receiving UE,

If that select in step 103 is a, the base station uses the KeNB* that has generated as the new KeNB of UE, carry out security set after, use new security configuration that order is finished in switching and carry out security process (comprising integrity protection and deciphering).

If that select in step 103 is b, two key K eNB* that the base station can generate _S-Cell3And KeNB* _S-Cell4Middle selection receives that the KeNB* that switches the sub-district correspondence of finishing order is the new KeNB of UE, selects S-Cell4 to send switching as UE in this example and finishes order, and the base station is then selected KeNB* for use _S-Cell4The new KeNB of UE for use this base station uses new security configuration that order is finished in switching then and carries out security process.

Embodiment 2: X2 handoff scenario between the base station

Terminal UE is operated under the source base station S-eNB that supports carrier aggregation, and to be configured sub-district S-Cell1 and S-Cell2 that source base station has jurisdiction over be the carrier aggregation sub-district, and wherein sub-district S-Cell1 is as main carrier sub-district PCC.

Step 201, UE measures adjacent sub-district, and after satisfying measurement event, the UE reporting measurement reports is given source base station S-eNB;

Step 202, source base station S-eNB judges according to measurement report that the terminal UE needs switch in the sub-district under the handover-target base station T-eNB, when Target cell had a plurality of (for example sub-district T-Cell1 or T-Cell2), S-eNB can have 2 kinds of selections for Target cell:

C. in handoff request message, notify handover-target base station, intended target sub-district or target P CC are T-Cell1 or T-Cell2.

D. in handoff request message, the Target cell or the target P CC of notice handover-target base station can select in T-Cell1 or T-Cell2.

Wherein the derivation of key can level be derived from or vertical the derivation.For example according to selecting c, source base station is specified under the situation of T-Cell1 for the main carrier sub-district PCC after switching:

When level derives from:

KeNB*＝KeNB* _T-Cell1＝KDF(KeNB _S-eNB，PCI _T-Cell1，EARFCN-DL _T-Cell1)；

During vertical the derivation:

KeNB*＝KeNB* _T-Cell1＝KDF(NH，PCI _T-Cell1，EARFCN-DL _T-Cell1)；

For selecting c, during the source base station derivative key, derive from KeNB* according to the Target cell of appointment or target P CC, afterwards, the KeNB* of the Target cell of appointment or target P CC, derivation and corresponding NCC be carried in the handoff request message send to handover-target base station.

For selecting d, source base station is all possible Target cell or target P CC derivative key, calculates the safe key KeNB* of each Target cell correspondence _T-Cell1And KeNB* _T-Cell2, and two sub-districts and each self-corresponding key and next corresponding hop count NCC be carried in the handoff request message send to handover-target base station; Perhaps one of them sub-district with and the key and the corresponding NCC that derive from send by handoff request message, the key of other sub-district and its derivation can be placed in the RRC transparent vessel in the handoff request message and send to T-eNB.

Step 203, handover-target base station T-eNB is for above-mentioned selection c, can be as selecting the described mode of a in the step 103, just herein target BS to choose the sub-district of source base station appointment be Target cell, for selecting d can select among its sub-district T-Cell1 that has jurisdiction over or the T-Cell2 one as the main carrier sub-district PCC after switching, as selecting the described mode of a in the step 103, target BS is chosen a Target cell or target P CC, preserve corresponding KeNB*, the switching command that configures carries NCC.For selecting d, T-eNB also can by UE own select target sub-district or target P CC, preserve all KeNB* as selecting the described mode of b in the step 103, and the switching command that configures carries NCC.

Switching command is carried at by the RRC container and returns to source base station S-eNB in the switching request response, and sends to terminal UE by source base station S-eNB.

Step 204, UE handles identical with step 104.Calculating the safe key KeNB* that obtains terminal _UEAfterwards, terminal UE will be used this KeNB* _UEAs its key under handover-target base station T-eNB, according to the security algorithm in the switching command, enable new security parameter, in Target cell or target P CC sub-district, can be that T-Cell1 goes up the transmission handoff completion message as this example.

Step 205; after handover-target base station T-eNB receives the handoff completion message of terminal; if that select in step 203 is a; the base station uses the KeNB* that preserves as the new KeNB of UE; after carrying out security set, use new security configuration that order is finished in switching and carry out security process (comprising integrity protection and deciphering).If that select is b, safe key KeNB* will be cut what the source base station of preserving before send in this base station _T-Cell1And KeNB* _T-Cell2Middle selection receives that the KeNB* that switches the sub-district correspondence of finishing order is the new KeNB of UE, and UE sends to switch on T-Cell1 and finishes order in step 203, so T-eNB selects KeNB* for use _T-Cell1Be the new KeNB of UE, use new security configuration that order is finished in switching then and carry out security process.

Step 206, T-eNB successfully solve switch finish order after, T-eNB gives MME with transmit path handoff request message, allows MME notice S-GW that downlink data is switched to T-eNB from S-eNB.After finishing, gives MME T-eNB transmit path switching response message.

Step 207, in the T-eNB storing path switching response message { NH, NCC} uses being, uses as next key derivation.

Embodiment 3: S1 handoff scenario between the base station

Step 301, UE measures adjacent sub-district, and after satisfying measurement event, the UE reporting measurement reports is given source base station S-eNB;

Step 302, source base station S-eNB judges according to measurement report that the terminal UE needs switch in the sub-district under the handover-target base station T-eNB, when Target cell has when a plurality of, S-eNB can have 2 kinds of selections for Target cell:

E. in handoff request message, the notification target base station, intended target sub-district or target P CC are T-Cell1 or T-Cell2.

F. in handoff request message, notification target base station Target cell or target P CC can select in T-Cell1 or T-Cell2.

Owing to be that S1 switches, so the KeNB* of the not responsible generation handover-target base station of source base station.

For selecting e, source base station as T-Cell1, sends to handover-target base station with the Target cell or the target P CC of appointment in switching preparation message.

For selecting f, source base station all is carried at two possible Target cells to switch and prepares to send to handover-target base station in the message, perhaps the message transmission is prepared by switching in one of them sub-district, and other sub-district can be placed on to switch in the RRC transparent vessel of preparing in the message and send to MME.

Step 303 after MME receives and switch to prepare message, sends handoff request message to handover-target base station, and { NH, NCC} is right to carry vertical derivation new.

Step 304 after target BS T-eNB receives handoff request message, then generates KeNB* according to vertical derivation mode by NH, its Target cell go into to join PCI and EARFCN-DL can be:

If that the selection in the step 302 is e, T-eNB selects to switch the Target cell of preparing in the message PCI and EARFCN-DL is provided so, and that select in this example is T-Cell1.Selected back and NH produce KeNB* together and preserve, and the switching command that configures carries the NCC that MME sends.

If that the selection in the step 302 is f, T-eNB can select one among T-Cell1 or the T-Cell2 key derivation parameter PCI and EARFCN-DL are provided so.By as selecting the described mode of a in the step 103, preserve the corresponding KeNB* that derives, and the switching command that configures carries the NCC that MME sends.

If that the selection in the step 302 is f, T-eNB also can by UE own select target sub-district or target P CC, preserve all KeNB*, as KeNB* by as selecting the described mode of b in the step 103 _T-Cell1And KeNB* _T-Cell2,, the switching command that configures carries the NCC that MME sends.

T-eNB sends switching response message to MME, wherein carries the switching command that configures in the RRC container, and MME is transmitted to S-eNB with switching command, and sends to UE by S-eNB.

Step 305, UE handles identical with step 204.

Step 306, after handover-target base station T-eNB receives that information is finished in the switching of terminal,

If in step 304, select under the situation of f; further adopted as the mode a in the step 103; handover-target base station uses the KeNB* that preserves as the new KeNB of UE; after carrying out security set, use new security configuration that order is finished in switching and carry out security process (comprising integrity protection and deciphering).

If select further to have adopted as the mode b in the step 103 under the situation of f in step 304, handover-target base station will be at the safe key KeNB* that preserves before _T-Cell1And KeNB* _T-Cell2Middle selection receives that the KeNB* that switches the sub-district correspondence of finishing order is the new KeNB of UE, in step 305, finishes order if UE sends to switch on T-Cell1, and T-eNB then selects KeNB* for use _T-Cell1Be the new KeNB of UE, use new security configuration that order is finished in switching then and carry out security process.

Step 307, T-eNB successfully solve switch finish order after, T-eNB will send handoff notification message to MME, finish switching.

Embodiment 4: the scene of switching back main carrier sub-district PCC change

Terminal is in the following time of base station of supporting carrier aggregation, owing to reasons such as signal variation or load variations, main carrier sub-district PCC can make amendment, and in the PCC modification process, original base station safe key can be selected not revise in the base station, thereby can avoid because the service disconnection that the security parameter change causes.

For example, after terminal switches to handover-target base station T-eNB from source base station S-eNB, main carrier sub-district when initial is T-Cell1, because signal changes or load variations, main carrier sub-district PCC can take place to be revised, for example revising the main carrier sub-district is T-Cell2, in the PCC modification process, does not need to revise original KeNB _T-eNB, as shown in Figure 8.

The RRC re-construct:

When terminal UE generation Radio Link Failure, handoff failure or other failure (as reasons such as configuration parameter mistakes), UE can initiate the radio resource control RRC process of reconstruction.If there is the contextual information of UE the reconstructed object base station, UE can rebuild success so.RRC rebuilds the shortMAC-I=shortINTEGRITY (KeNB that carries in the request command _{Source eNB}, PCI _{Source cell}, C-RNTI _{Source cell}, CellID _{Target cell}), when UE carries out carrier aggregation before reconstruction, select for use the PCC before rebuilding to provide PCI and C-RNTI, shortMAC-I=shortINTEGRITY (KeNB _{Source eNB}, PCI _{PCC prior to failure}, C-RNTI _{PCC prior to failure}, Cell ID _{Taret cell}), wherein shortINTEGRITY is a protection algorithm integrallty, as shown in Figure 9.

Embodiment 5: the scene that RCC rebuilds in the base station

Step 501, UE starts Cell searching, finds the reconstructed object sub-district, and the reconstruction sub-district is the S-Cell3 under the S-eNB.

Step 502, UE can send RRC and rebuild request message after finish random access procedure.According to the formula of above-mentioned shortMAC-I, when UE rebuild request message at the RRC that sends, the shortMAC-I that carries was calculated as:

ShortMAC-I _UE=shortINTEGRITY (KeNB _S-eNB, PCI _S-Cell1, C-RNTI _S-Cell1, CellID _S-Cell3), RRC rebuilds request message and also can carry PCI simultaneously _S-Cell1And C-RNTI _S-Cell1

Step 503, base station S-eNB receives that the RRC that UE sends rebuilds request message.According to above-mentioned shortMAC-I _UEFormula can obtain the shortMAC-I that this UE reports by RRC reconstruction request message _UE, and the PCI that carries _S-Cell1And C-RNTI _S-Cell1Information.But owing to identical PCI can use on different frequencies, so may there be a plurality of UE that all mate with PCI and C-RNTI.Thereby S-eNB is according to the KeNB of each UE correspondence _S-eNBCalculate the shortMAC-I of each UE correspondence respectively _S-eNB=shortINTEGRITY (KeNB _S-eNB, PCI _S-Cell1, C-RNTI _S-Cell1, Cell ID _S-Cell3).As one of them shortMAC-I _S-eNBThe shortMAC-I that energy and UE report _UEDuring coupling, S-eNB can confirm the context of this UE correspondence, can continue to finish follow-up process of reconstruction.

Embodiment 6: the scene that RCC rebuilds between the base station

When the reconstruction between the generation base station, the source base station needs send to the possibility Target cell to prepare with the context of UE in advance.Because S-eNB can't confirm which sub-district UE finally can rebuild to before reconstruction, so to all possible reconstructed object sub-district, source base station S-eNB can calculate a shortMAC-I.S-eNB uses the parameter of current main carrier sub-district PCC and possible reconstructed object cell parameter to calculate brachymemma message integrity authentication code shortMAC-I.

Suppose that terminal UE is operated under the source base station S-eNB that supports carrier aggregation, and to be configured sub-district S-Cell1 and S-Cell2 that source base station has jurisdiction over be the carrier aggregation sub-district, wherein sub-district S-Cell1 is as main carrier sub-district PCC.Reconstructed object base station R-eNB is the base station of supporting carrier aggregation, and sub-district R-Cell1 and R-Cell2 are the sub-district of the carrier aggregation used that R-eNB had jurisdiction over.Source base station will calculate shortMAC-I respectively for sub-district R-Cell1 and R-Cell2:

shortMAC-I _R-cell1＝shortINTEGRITY(KeNB _S-eNB，PCI _S-cell1，C-RNTI _S-cell1，Cell?ID _R-cell1)，

shortMAC-I _R-cell2＝shortINTEGRITY(KeNB _S-eNB，PCI _S-cell1，C-RNTI _S-cell1，Cell?ID _R-cell2)；

Wherein, KeNB _S-eNBBe the key that UE uses in source base station S-eNB, R-Cell1 and R-Cell2 are possible reconstructed object sub-districts.S-eNB finishes to rebuild by above-mentioned flow process and prepares, and rebuilds and prepares the C-RNTI that parameter comprises the main carrier sub-district correspondence of source base station _{Source PCC}, PCI _{Source PCC}With the short MAC-I that is a plurality of reconstructed object sub-district, the corresponding possible reconstructed object sub-district of each short MAC-I.

Step 601, UE starts Cell searching, finds the reconstructed object sub-district, and the reconstruction sub-district is the R-Cell1 under the R-eNB.

Step 602 and step 502 are similar, and UE can send RRC and rebuild request message to reconstructed object base station R-eNB after R-Cell1 finish random access procedure, and when UE rebuild request message at the RRC that sends, the short MAC-I that carries was calculated as:

ShortMAC-I _UE=shortINTEGRITY (KeNB _S-eNB, PCI _S-Cell1, C-RNTI _S-Cell1, CellID _R-Cell1), RRC rebuilds the PCI that request message can carry current main carrier sub-district S-Cell1 simultaneously _S-Cell1And C-RNTI _S-Cell1

Step 603, reconstructed object base station R-eNB receives that the RRC that UE sends rebuilds request message.R-eNB is according to above-mentioned shortMAC-I _UEFormula can be rebuild request message from RRC and obtain the shortMAC-I that this UE reports _UE, and the PCI that carries _S-Cell1And C-RNTI _S-Cell1Information.Because identical PCI can use on different frequencies, so the UE that may exist a plurality of PCI and C-RNTI all to mate.R-eNB is according to the PCI that carries in the UE message _S-Cell1And C-RNTI _S-Cell1, calculate the shortMAC-I of each UE correspondence _R-cell1R-eNB is according to the shortMAC-I of each UE correspondence _R-cell1The shortMAC-I that reports with UE _UEMate.Because a plurality of UE accord with PCI condition identical with C-RNTI arranged, compare shortMAC-I again _R-cell1And shortMAC-I _UEWhether which UE the identical UE of affirmation context is, when a coupling was found, R-eNB can confirm the context of this UE correspondence, can continue to finish follow-up process of reconstruction.

In the foregoing description 1-6, the generation rule of security parameter when having stipulated switching and/or reconstruction, thereby the influence to the transmission of user's face that the renewal that can farthest reduce security parameter on the one hand causes will be restricted to minimum to the modification of agreement behavior on the other hand.Thereby the present invention has simple and reliable characteristics, the fail safe in the time of can guaranteeing to switch and/or rebuild.

The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Claims

1. guarantee the method for multicarrier switch safety in the multi-carrier communications systems, it is characterized in that, comprising:

2. the method for claim 1 is characterized in that,

Described terminal, source base station or the handover-target base station input parameter during according to identical key schedule computation key also comprises: the safe key of terminal correspondence or next are jumped NH under the source base station;

3. method as claimed in claim 1 or 2 is characterized in that, between different districts the time, described source base station and described handover-target base station are same base station, promptly are all source base station self in described handoff procedure occurs in same base station;

4. method as claimed in claim 1 or 2 is characterized in that, between different districts the time, described source base station and described handover-target base station are same base station, promptly are all source base station self in described handoff procedure occurs in same base station;

5. method as claimed in claim 1 or 2 is characterized in that, when described handoff procedure occurs between different districts between different base station by the X2 mouth,

Source base station is specified one as Target cell or main carrier sub-district after switching from a plurality of Target cells that handover-target base station is had jurisdiction over, and according to key schedule, with safe key or next jumping NH of terminal correspondence under the source base station, the Physical Cell Identifier of switching target small area and descending carrier frequency calculate safe key corresponding with terminal under the handover-target base station as input parameter; With Target cell or the main carrier sub-district and the corresponding safe key of this appointment, also have next hop count information to be carried in the handoff request message and send to handover-target base station;

6. method as claimed in claim 1 or 2 is characterized in that, when described handoff procedure occurs between different districts between different base station by the X2 mouth,

Source base station is each in a plurality of Target cells of having jurisdiction over of handover-target base station, according to key schedule, with safe key or next jumping NH of terminal correspondence under the source base station, the Physical Cell Identifier of each Target cell and descending carrier frequency calculate the safe key corresponding with terminal of each Target cell under the handover-target base station as input parameter; With the information and the corresponding safe key of target complete sub-district, also have next hop count information to be carried in the handoff request message and send to handover-target base station;

7. method as claimed in claim 1 or 2 is characterized in that, when described handoff procedure occurs between different districts between different base station by the X2 mouth,

8. method as claimed in claim 1 or 2 is characterized in that, when described handoff procedure occurs between different districts between different base station by the S1 mouth,

Specify one in a plurality of Target cells that source base station is had jurisdiction over handover-target base station as Target cell or main carrier sub-district after the switching, inform Mobility Management Entity by switching preparation message, Mobility Management Entity sends handoff request message, and this main carrier cell information and next jumping NH are sent to handover-target base station;

9. method as claimed in claim 1 or 2 is characterized in that, when described handoff procedure occurs between different districts between different base station by the S1 mouth,

The target complete cell information that source base station is had jurisdiction over handover-target base station is informed Mobility Management Entity by switching preparation message; Mobility Management Entity sends handoff request message, and target complete cell information and next jumping NH are sent to handover-target base station;

10. method as claimed in claim 1 or 2 is characterized in that, when described handoff procedure occurs between different districts between different base station by the S1 mouth,

11. method as claimed in claim 1 or 2 is characterized in that, described method further comprises the steps: after finishing switching

Rebuild the method for fail safe 12. guarantee multicarrier in the multi-carrier communications systems, it is characterized in that, comprising:

13. method as claimed in claim 12 is characterized in that, the reconstructed object base station judges that the concrete steps of terminal brachymemma message integrity authentication code coupling comprise:

14., it is characterized in that described source base station and reconstructed object base station are same base stations as claim 12 or 13 described methods.