CN100370873C - Method for solving off normal encipher-decipher after transport of service radio network system - Google Patents

Abstract

The present invention relates to a method for solving the problem that transparent mode radio bearing (RB) is failure in encryption and decryption after a service radio network system (SRNS) is transferred. User equipment (UE), a radio network controller (RNC) and a core network (CN) are encrypted, and the RB with transparent mode exists in a radio link control layer (RLC); meantime, the system is provided with encryption activation time CFN act and corresponding encryption parameter HFN new. The method comprises the steps: a. the UE sends the encryption activation time CFN act provided by the system to the SRNC before the SRNS is judged to be triggered to transfer; B. when the SRNS is judged to be triggered to transfer, the SRNC waits until the encryption activation time CFN act comes in a delaying mode to originate the transfer of the SRNS. The present invention ensures that after the transfer of the SRNS is finished, the transparent mode RBs on both sides of the UE and the DRNC can carry out encryption and decryption normally.

Description

Solve the method for service radio network system migration back encryption and decryption failure

Technical field

The present invention relates to the migrating technology in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, relate in particular to the method for a kind of solution service radio network system (SRNS) migration back transparent mode radio bearer (RB) encryption and decryption failure.

Background technology

WCDMA is a kind of present widely used 3-G (Generation Three mobile communication system) technology.WCDMA is as an open-standards, and it mainly is made up of the land radio access web (UTRAN) and the core net (CN) of subscriber equipment (UE), universal mobile telecommunications system.Wherein UE carries out data interaction by the air interface and the network equipment, for the user provides the function of the miscellaneous service in circuit domain and the packet domain, comprises common speech, data communication, mobile multimedia and Internet application etc.; UTRAN is divided into base station (Node B) and two parts of radio network controller (RNC), Node B is by the Iub interface and the RNC interconnection of standard, mainly finish the processing of air interface physical layer agreement, and RNC mainly finishes functions such as connecting foundation and disconnection, switching, the merging of grand diversity, RRM control; CN be responsible for other networks be connected and to communication and the management of UE.

SRNS migration flow process in the WCDMA system has been described in 3GPP 25.331 and 3GPP 25.413 agreements.Wherein, the SRNS migration can be followed migration and forward direction switching for static migrating, direct-cut operation and follow types such as migration, and sets up the SRNS migration that process and direct-cut operation etc. all can trigger respective type such as radio bearer (RB).This sentences and triggers the SRNS static migrating after the direct-cut operation flow process is that example describes.

As shown in Figure 1, this flow process may further comprise the steps:

Step 101～102. at first SRNC send physical channel to UE and reconfigure PHYSICALCHANNEL RECONFIGURATION message, and then UE returns physical channel to SRNC and reconfigures and finish PHYSICAL CHANNEL RECONFIGURATION COMPLETE message.

So far, UE finishes direct-cut operation.

Step 103.SRNC triggers judgement by migration and initiates the SRNS static migrating.

Step 104～106. at first, SRNC sends migration request RELOCATIONREQUIRED message to CN; Then, CN sends migration request RELOCATION REQUEST message to DRNC after receiving migration request RELOCATION REQUIRED message, and notice DRNC prepares the required resource of migration; At last, DRNC confirms RELOCATIONREOUEST ACKNOWLEGE message to the request of CN remigration, and notice CN has been ready to required resource.

In the above-mentioned steps, if UE, RNC and CN have disposed encryption, and there has been the RB of transparent mode in rlc layer, then SRNC sends to CN by migration request RELOCATION REQUIRED message with the encryption parameter of transparent mode RB, and CN sends to DRNC by migration request RELOCATIONREQUEST message with described encryption parameter again.

Step 107～108.CN sends migration order RELOCATION COMMAND message to SRNC, and notice SRNC begins to move; Then, SRNC will move execution RELOCATIONCOMMIT message and send to DRNC, start the SRNS migration.

Step 109.DRNC sends migration to CN and detects RELOCATION DETECT message, and notice DRNC detects migration and triggers.

Step 110～112.DRNC sends UTRAN mobile message UTRAN MOBILITYINFORMATION message to UE, and the various parameters of the UTRAN that will change owing to migration bring UE; UE returns UTRAN mobile message affirmation UTRAN MOBILITYINFORMATION CONFIRM message to DRNC then; Then DRNC sends migration to CN and finishes RELOCATION COMPLETE message, and notice CN migration successfully finishes.

Step 113～114.CN sends to SRNC with Iu release command IU RELEASE COMMAND message, and notice SRNC discharges Iu and connects; After SRNC finishes and discharges the Iu connection, return the release of Iu interface to CN and finish IU RELEASE COMPLETE message.

So far, direct-cut operation and SRNS static migrating are finished.

In the above-mentioned flow process, the transparent mode RB of UE and DRNC uses encryption count parameter COUNT-C to carry out encryption and decryption.Described COUNT-C comprises Connection Frame Number (CFN) and the pairing super frame number of CFN (HFN) two parts.In length overall was 32 COUNT-C, least-significant byte was the CFN that uses as time quantum, and high 24 is the HFN that uses as encryption parameter.Wherein the span of CFN is 0～255; When the value of CFN was 255, UE put 0 and the numerical value of HFN added 1 again with CFN, and then CFN continues to add 1 counting.Could (, not add this speech herein owing to words such as " the rest may be inferred " preferably do not occur in the patent document?)

Regulation according to the 3GPP agreement, the direct-cut operation that UE carried out comprises two types: a kind of is the direct-cut operation (Timing-maintained hard handover) that keeps the timing relationship type, and another kind is the direct-cut operation (Timing re-initial hard handover) that reinitializes the timing relationship type.Both differences are: the former and direct-cut operation CFN before keep continuously; The latter will reinitialize CFN, and at UE, RNC with CN has disposed encryption and rlc layer has existed under the situation of transparent mode RB, system can dispose a ciphering activation time CFN _Act, and CFN _ActPairing encryption parameter HFN _New, when CFN equals CFN _ActThe time, the transparent mode RB of UE and SRNC will use new encryption parameter HFN simultaneously _New

Use above-mentioned flow process, if UE, RNC and CN be configured encryption before direct-cut operation, simultaneously there has been the RB of transparent mode in Radio Link control (RLC) layer, and system configuration ciphering activation time CFN _Act, and CFN _ActPairing encryption parameter HFN _New, then according to the regulation of 3GPP agreement, UE is at the response message of direct-cut operation flow process, and promptly the physical channel of step 102 reconfigures to finish in the PHYSICAL CHANNEL RECONFIGURATION COMPLETE message and returns ciphering activation time CFN to SRNC _ActWhen CFN equals CFN _ActThe time, the transparent mode RB of UE and SRNC will use new encryption parameter HFN simultaneously _New

If when the SRNS migration is initiated in the SRNC judgement, do not arrive ciphering activation time CFN _Act, then according to agreement regulation, SRNC need be in the migration request message of step 104 and 105 sends to DRNC with the encryption parameter HFN of transparent mode RB, to guarantee that UE and DRNC carry out encryption and decryption to the data of transparent mode RB later in migration.But, owing to do not have and ciphering activation time CFN in the migration request message of step 104 and 105 _ActRelevant cell, promptly DRNC can't obtain CFN _ActNumerical value thereby can be at CFN _ActTime changing encryption parameter HFN.At this kind situation, at no show CFN _ActThe time, SRNC can select the encryption parameter HFN with the current use of transparent mode RB _OldSend to DRNC; Perhaps with transparent mode RB from CFN _NewThe new encryption parameter HFN that constantly brings into use _NewSend to DRNC.The shortcoming of above-mentioned two kinds of methods is:

(1) if SRNC with the encryption parameter HFN of the current use of transparent mode RB _OldSend to DRNC, then work as CFN and equal CFN _ActThe time, the transparent mode RB of UE side uses new encryption parameter HFN _New, but because DRNC can't get access to CFN _ActAnd corresponding HFN _NewAnd can not switch encryption parameter, promptly DRNC will use encryption parameter HFN _OldTherefore at CFN _ActConstantly,, thereby will cause SRNS migration back transparent mode RB from CFN because the employed encryption parameter of transparent mode RB of UE and DRNC is inconsistent _ActConstantly rise and data encrypting and deciphering occurs and make mistakes.

(2) if SRNC with transparent mode RB from CFN _ActThe encryption parameter HFN that constantly just brings into use _NewSend to DRNC, then as CFN no show CFN _ActBefore, the transparent mode RB of UE side uses old encryption parameter HFN _OldBut DRNC is using new encryption parameter HFN this moment _NewTherefore at CFN _ActConstantly,, and will cause SRNS migration back transparent mode RB at CFN because the employed encryption parameter of transparent mode RB of UE and DRNC is inconsistent _ActData encrypting and deciphering occurring constantly makes mistakes.

(3) at SRNC with transparent mode RB from CFN _ActThe encryption parameter HFN that constantly just brings into use _NewSend under the situation of DRNC, if at no show CFN _ActThe situation that CFN equals 0 occurred, promptly CFN circulation occurred and has turn-taked, and then according to 3GPP agreement regulation, the pairing HFN numerical value of CFN=0 should should be added 1 before.So the employed encryption parameter of transparent mode RB of DRNC is (HFN _New+ 1).And when arriving CFN _ActAfter, the transparent mode RB of UE is replaced by HFN with encryption parameter _New, still inconsistent with the DRNC side.Therefore in this case, CFN _ActTransparent mode RB data encrypting and deciphering also can occur and makes mistakes constantly.

Trigger in the various flow processs of SRNS migration behind the different operating of in the 3GPP agreement, stipulating, as long as satisfied: (1) UE, RNC and CN have been configured encryption, (2) Radio Link control (RLC) layer has existed the RB of transparent mode, (3) system configuration ciphering activation time CFN _ActAnd corresponding encryption parameter HFN _NewDeng three conditions, all can there be the shortcoming of above-mentioned SRNS migration back transparent mode RB encryption and decryption failure.

Summary of the invention

In view of this, the object of the present invention is to provide the solution of a kind of SRNS migration back transparent mode RB encryption and decryption failure, make the SRNS migration finish after the normal encryption and decryption of transparent mode RB of UE and DRNC both sides.

For achieving the above object, the invention provides the solution of a kind of SRNS migration back transparent mode RB encryption and decryption failure, user equipment (UE), radio network controller (RNC) and core net CN have disposed encryption, and there has been the RB of transparent mode in Radio Link control rlc layer, simultaneity factor configuration ciphering activation time CFN _ActAnd corresponding encryption parameter HFN _New, this method may further comprise the steps:

Before the A.SRNS migration triggered judgement, UE was with the ciphering activation time CFN of system configuration _ActAnd corresponding encryption parameter HFN _NewSend to SRNC;

B. after the SRNS migration triggered judgement, the SRNC time-delay was waited for to ciphering activation time CFN _ActConstantly, the transparent mode RB of SRNC uses encryption parameter HFN _NewThe SRNS migration is initiated in the back.

The time-delay of SRNC described in the step B is waited for and specifically be may further comprise the steps:

The activationary time CFN that obtains among the B1.SRNC calculation procedure A _ActAnd the difference DELTA CFN between current self the CFN;

B2.SRNC is provided with timing t and picks up counting, and arrives constantly up to t; Wherein said t is more than or equal to Δ CFN.

The described time-delay of step B is waited for to using the Timer timing.

Use the present invention, SRNC waits for to CFN after migration triggers judgement _ActCarry out the SRNS migration constantly again.Particularly, the present invention has following beneficial effect:

(1) SRNC waits for to CFN _ActCarry out the SRNS migration constantly again, the encryption parameter that then sends to DRNC in migration request message is CFN _ActThe HFN that constantly brings into use _NewBecause after this UE can be because of CFN _ActExistence and switch encryption parameter, so after the SRNS migration flow process, UE is consistent with the employed encryption parameter of transparent mode RB of DRNC, can guarantee that then the data encrypting and deciphering of transparent mode RB carries out smoothly.

(2) the present invention has only increased the step of a wait on the basis of existing protocol, and is less to the change of agreement, realizes comparatively simply, also kept simultaneously the compatibility of 3GPP agreement.

Description of drawings

Fig. 1 is the flow chart that direct-cut operation triggers the SRNS static migrating in the prior art.

Fig. 2 triggers the flow chart of transparent mode RB encryption and decryption failure solution among the SRNS static migrating embodiment for direct-cut operation of the present invention.

Embodiment

For making purpose of the present invention, technical scheme clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.

The present invention is the solution of a kind of SRNS migration back transparent mode RB encryption and decryption failure, its basic thought is: before the SRNS migration, if UE, RNC and CN have been configured encryption, simultaneously there has been the RB of transparent mode in rlc layer, and the ciphering activation time CFN of no show transparent mode RB still _Act, then SRNC waits for a period of time after judgement SRNS migration, up to CFN _ActJust initiate SRNS migration flow process constantly.

The application of the present invention in the various flow processs of different operating triggering SRNS migration is basic identical, and this solution of sentencing transparent mode RB encryption and decryption failure in the direct-cut operation triggering SRNS static migrating is that example describes.

As shown in Figure 2, the solution of transparent mode RB encryption and decryption failure may further comprise the steps in the direct-cut operation triggering SRNS static migrating:

Step 201～202. at first, SRNC sends physical channel to UE and reconfigures PHYSICALCHANNEL RECONFIGURATION message; Then, UE returns physical channel to SRNC and reconfigures and finish PHYSICAL CHANNEL RECONFIGURATION COMPLETE message.

Step 203.SRNC moves and triggers judgement.

Step 204.SRNC waits for to CFN _ActConstantly, initiate the SRNS static migrating.

This step can realize the wait of SRNC with Timer.Detailed process is as follows:

At first, the CFN that obtains in the SRNC calculation procedure 202 _ActDifference DELTA CFN with current C FN;

Then, SRNC is provided with the timing t of Timer, and wherein t is any integer more than or equal to Δ CFN;

At last, the Timer among the SRNC is carried out timing according to t, and after arriving t execution in step 205.

Step 205～215, SRNS carries out static migrating.Herein with Fig. 1 in step 104～114 identical.

Trigger in the flow process of SRNS migration in other operations, the solution of the RB encryption and decryption failure of transparent mode is identical with method shown in Figure 2 after moving for SRNS, all is that SRNC waits for to CFN after the migration of SRNC triggers judgement _ActJust begin to carry out the SRNS migration constantly.

The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. a service radio network system SRNS moves the solution that back transparent mode radio bearer RB encryption and decryption is failed, user equipment (UE), radio network controller (RNC) and core net CN have disposed encryption, and there has been the RB of transparent mode in Radio Link control rlc layer, simultaneity factor configuration ciphering activation time CFN _ActAnd corresponding encryption parameter HFN _New, it is characterized in that this method may further comprise the steps:

A. before judgement triggered the SRNS migration, UE was with the ciphering activation time CFN of system configuration _ActSend to SRNC;

B. when judgement triggered the SRNS migration, the SRNC time-delay was waited for to ciphering activation time CFN _ActConstantly, the transparent mode RB of SRNC uses encryption parameter HFN _NewThe SRNS migration is initiated in the back.

2. the method for claim 1 is characterized in that, the time-delay of SRNC described in the step B is waited for and specifically be may further comprise the steps:

The activationary time CFN that obtains among the B1.SRNC calculation procedure A _ActAnd the difference DELTA CFN between current self the CFN;

B2.SRNC is provided with timing t and picks up counting, and arrives constantly up to t; Wherein said t is more than or equal to Δ CFN.

3. method as claimed in claim 1 or 2 is characterized in that, the described time-delay of step B is waited for to using the Timer timing.

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