CN100466501C - Method for producing long code mask for cluster service - Google Patents

Method for producing long code mask for cluster service Download PDF

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Publication number
CN100466501C
CN100466501C CNB031561950A CN03156195A CN100466501C CN 100466501 C CN100466501 C CN 100466501C CN B031561950 A CNB031561950 A CN B031561950A CN 03156195 A CN03156195 A CN 03156195A CN 100466501 C CN100466501 C CN 100466501C
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China
Prior art keywords
group
long code
network side
code mask
ssd
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Expired - Fee Related
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CNB031561950A
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Chinese (zh)
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CN1592175A (en
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王强
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

This invention discloses a long code and mask generation method used in the cluster service including 1) when a MS having signed the cluster service opens an account, the cluster service discrimination ciphered key and shared ciphered data are stored separately at the MS and the network side, 2) The said MS sends a set calling request of ESN to the network containing set number and MS, 3) The network generates random number(RANDC) and broadcasts information to the set service zone containing RANDC, set number and ESN of MS uses same parameter and algorithm to compute the long code and mask.

Description

A kind of generation method that is used for the Long Code Mask of group service
Technical field
The present invention relates to the generation method of Long Code Mask in code division multiple access (CDMA) 2000 systems, particularly a kind of generation method that is used for the Long Code Mask of group service.
Background technology
The CDMA2000 standard belongs to one of 3G system standard system, and the CDMA2000 system provides voice and high-speed packet data service for the user.Stipulate in the IS2000 agreement that Long Code Mask is used for the setting of channel physical layer parameter.Long Code Mask is divided into publicly-owned Long Code Mask and privately owned Long Code Mask two classes, and the former generates and be used for being provided with the Traffic Channel parameter usually when travelling carriage (MS) initiation or call accepted; The latter generally is in communication process, in order to improve call confidentiality, is initiated to generate after the request of change Long Code Mask by MS or network side, and is used for resetting the Traffic Channel parameter.Publicly-owned Long Code Mask and privately owned Long Code Mask do not transmit by air interface, but use identical parameter and algorithm computation to generate at MS separately with the network side both sides.
Publicly-owned Long Code Mask generative process is referring to Fig. 1, and Fig. 1 is the publicly-owned Long Code Mask product process of a prior art schematic diagram.This flow process may further comprise the steps:
Step 101, MS sends initial call message to network side, wherein comprises the Electronic Serial Number (ESN) of MS.
Step 102, the publicly-owned Long Code Mask of algorithm computation that network side provides according to the CDMA2000 agreement according to the ESN that receives.
Computational methods are: establish the bit arrangement that M41...M0 is publicly-owned Long Code Mask, high-order preceding, publicly-owned Long Code Mask comprises M41-M0 totally 42 bits, and wherein M41 to M32 is changed to " 1100011000 ", and M31 to M0 is the rearranging of ESN bit of MS.This aligning method is as follows:
ESN＝(E31，E30，E29，E28，E27，E26，E25，......，E2，E1，E0)
M31 to M0=(E0, E31, E22, E13, E4, E26, E17, E8, E30, E21, E12, E3, E25, E16, E7, E29, E20, E11, E2, E24, E15, E6, E28, E19, E10, E1, E23, E14, E5, E27, E18, E9)
Step 103, network side distribution service channel also is provided with this Traffic Channel parameter according to the publicly-owned Long Code Mask that calculates.
Step 104, network side send to MS and set up traffic channel message.
Step 105, MS is provided with the Traffic Channel parameter according to the publicly-owned Long Code Mask that self calculates after receiving and setting up traffic channel message.
The method that MS calculates publicly-owned Long Code Mask is identical with the method that network side calculates publicly-owned Long Code Mask, also is that ESN bit with MS oneself rearranges and forms.
MS can calculate publicly-owned Long Code Mask earlier before sending initial call message, also can calculate publicly-owned Long Code Mask again after setting up channel massage receiving.
Privately owned Long Code Mask generative process is referring to Fig. 2, and Fig. 2 is the privately owned Long Code Mask product process of a prior art schematic diagram.It is example that this flow process is initiated to revise Long Code Mask message with network side in the communication process, may further comprise the steps:
Step 201, in the communication process, network side sends Long Code Mask to MS and changes message in order to improve call confidentiality.
Step 202, MS receives that Long Code Mask changes after the message to network side echo reply message.
Step 203, MS calculates privately owned Long Code Mask, and resets channel parameter according to privately owned Long Code Mask.
The CDMA2000 agreement provides the generation method of the privately owned Long Code Mask of Traffic Channel, and computational methods are as follows:
M41 to M40 is changed to " 01 ", M39 to M0 is the low 40bit of voice private mask (VPM), VPM generates the 520bit number that (Key_VPM_Generation) algorithm produces by the voice private mask based on cellular authentication and voice encryption (CAVE) algorithm, and privately owned Long Code Mask has only been used its low 40bit.
The concrete grammar that generates privately owned Long Code Mask is:
By ESN, RAND_CHALLENGE, SSD, AUTH_DATA, SSD_AUTH, parameter, use the Auth_Signature algorithm to re-use the Key_VPM_Generation algorithm computation earlier and come out, these two kinds of algorithms are all based on cellular authentication and voice encryption algorithm (CAVE) algorithm.
Wherein, ESN is the Electronic Serial Number of this MS, is changeless.
Random number (RAND_CHALLENGE) is to send to MS by network side during the beginning is exhaled authentication in the process, and MS and network side are all noted this random number during authentication.
SSD is when the MS authentication, and network side produces a random number, is come out by the SSD_Generation algorithm computation by the ESN of the KI A-key of this MS, random number, this MS; Network side sends to MS with the random number that produces simultaneously, and MS comes out with same parameter and algorithm computation.
AUTH_DATA, SSD_AUTH calculate when the MS authentication.
The interface of Auth_Signature algorithm and Key_VPM_Gernation algorithm is as follows:
(1)Auth_Signature
Calling input parameter comprises: RAND_CHALLENGE, ESN, AUTH_DATA, SSD_AUTH, SAVE_REGISTERS.
Storage inside input parameter: AAV, when calculating Long Code Mask, AAV=0xC7.SAVE_REGISTERS＝TRUE，
Call output parameter: AUTH_SIGNATURE, when calculating Long Code Mask, SAVE_REGISTERS=TRUE.
Storage inside output parameter: SAVED_LFSR, SAVED_OFFSET_1, SAVED_OFFSET_2, SAVED_RAND, SAVED_DATA.
(2)Key_VPM_Generation
Call input: do not have
Storage inside input parameter: SAVED_LFSR, SAVED_OFFSET_1, SAVED_OFFSET_2, SAVED_RAND, SAVED_DATA, SSD_B, AAV.
Call output: do not have
Storage inside output parameter: CMEAKEY[0-7], VPM.
Therefore, VPM depends on following parameter: RAND_CHALLENGE, ESN, AUTH_DATA, SSD_AUTH, SSD_B.
Step 204 after network side is received response message, is calculated privately owned Long Code Mask, and is reset channel parameter according to privately owned Long Code Mask.The method that network side calculates privately owned Long Code Mask is identical with the method that MS calculates privately owned Long Code Mask.
Group service in CDMA 2000 systems, be with user grouping, generally in same group adopt that forward traffic channel is shared, reverse traffic channel is seized multiplexing mode, be forward traffic channel all users broadcastings in group, reverse traffic channel uses according to mutual exclusions such as user applies time order and function and priority, do not use different preceding reverse traffic channels on the same group, the user used identical Long Code Mask in this just required to organize, and did not use different Long Code Masks on the same group.
The above-mentioned publicly-owned Long Code Mask and the generation method of privately owned Long Code Mask, because the ESN of each MS has nothing in common with each other, the Long Code Mask that the user calculates in same group has nothing in common with each other, and can't satisfy the demand of group service to Channel Sharing.
This shows that the generation method of publicly-owned Long Code Mask of the prior art and privately owned Long Code Mask can't be directly used in the Traffic Channel parameter is set in the group service.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of generation method that is used for the Long Code Mask of group service, the Long Code Mask of generation can satisfy the Channel Sharing of confidentiality and group service.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of generation method that is used for the Long Code Mask of group service, this method may further comprise the steps:
1) contracted the travelling carriage (MS) of group service when opening an account, at MS and network side group service KI (CT_A-key) of each group of saveset group business respectively; Generate the group service Shared Secret Data (CT_SSD) of each group respectively at MS and network side according to CT_A-key; Described network side comprises attaching position register (HLR), mobile switching centre (MSC), VLR Visitor Location Register (VLR), AUC (AC);
2) the contracted MS of group service sends the group calling request of the ESN comprise group number and MS to network side;
3) network side is received step 2) after the described group calling request, produce the random number (RANDC) of this group calling; And comprise the broadcast of ESN of the MS of RANDC, group number, initiation group calling to group service area broadcasting; Use the ESN of the MS of RANDC, group number, initiation group calling, the CT_SSD of this group to calculate Long Code Mask simultaneously, or use the condition code that the MS place group of RANDC, group number, initiation group calling sets in advance, the CT_SSD of this group to calculate Long Code Mask;
4) after the MS of initiation group calling receives broadcast with the MS that needs this group calling of adding, calculate the same method of Long Code Mask according to the step 3) network side respectively, calculate Long Code Mask.
Wherein, described MS of step 1) and network side are stored the method for CT_A-key respectively can be for the signatory group service of: MS the time, CT_A-key are stored in the subscriber identify module card and network side of MS.
The method that described MS of step 1) and network side are stored CT_A-key respectively also can for: when group service is set, CT_A-key is stored in network side, when the MS of the group service of having contracted started shooting for the first time, network side sent to the MS storage with CT_A-key.When the MS of the group service of having contracted started shooting for the first time, network side can also be encrypted CT_A-key earlier and send to MS then.
Step 1) described MS and network side generate respectively CT_SSD method can for: network side produces a random number and sends to MS, and MS and network side calculate CT_SSD respectively according to this random number and the CT_A-key that stores separately.
Step 1) is described what MS and network side generated CT_SSD respectively also can method to be: calculate CT_SSD by network side according to the CT_A-key of self storage earlier, the CT_SSD that calculates is sent to MS.
Network side can send to MS with the CT_SSD that calculates after encrypting.
The method of described generation CT_SSD can for: go out CT_SSD by CT_A-key by the SSD_Generation algorithm computation.
The method of described calculating Long Code Mask can for: 2 bits that Long Code Mask is the highest are " 01 "; Low 40 bits are: by ESN, the CT_SSD of this group of the MS of RANDC, group number, initiation group calling, use earlier the Auth_Signature algorithm, go out voice private mask (VPM) with the Key_VPM_Generation algorithm computation again, and get low 40 bits of the VPM that calculates
Or the condition code that sets in advance by the MS place group of RANDC, group number, initiation group calling, the CT_SSD of this group, use the Auth_Signature algorithm earlier, go out VPM with the Key_VPM_Generation algorithm computation again, and get 40 bits that hang down of the VPM that calculates.
The random number of this group calling that produces in the step 3) (RANDC) can be the same or different with the RANDC that group calling last time produces.If identical: then handle simply, but encryption is relatively poor; If different: then handle complexity slightly, but strong security; Recommend to use different.
Described step 3) may further include: network side distributes shared channel for this group calling, and with the Long Code Mask that calculates the Traffic Channel parameter is set;
Described step 4) may further include: initiate the MS of group calling and need the MS that adds this group calling with the Long Code Mask that calculates the Traffic Channel parameter to be set.
Step 3) is described comprise to group service area broadcasting the method for broadcast of ESN of the MS of RANDC, group number, initiation group calling can be for: network side by the group state information to group service area periodic broadcast above-mentioned parameter.
By technical scheme of the present invention as seen, this generation method that is used for the Long Code Mask of group service of the present invention when MS initiates group calling, uses ESN, the CT_SSD of this group of the MS of RANDC, group number, initiation group calling to calculate Long Code Mask.Unique, group service of Long Code Mask and general service Long Code Mask had nothing in common with each other the satisfied fully demand that has realized the group service Channel Sharing in the CDMA2000 system in the inventive method made in the group service that Long Code Mask is maintained secrecy, Long Code Mask has nothing in common with each other, organize between group.
Description of drawings
Fig. 1 is the publicly-owned Long Code Mask product process of a prior art schematic diagram;
Fig. 2 is the privately owned Long Code Mask product process of a prior art schematic diagram;
Fig. 3 is the Long Code Mask product process schematic diagram of a preferred embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
The core concept of the generation method of this Long Code Mask that is used for group service of the present invention is the basis at the privately owned Long Code Mask algorithm of CDMA2000, replace parameter in the privately owned Long Code Mask algorithm with new parameter, adopt privately owned Long Code Mask algorithm to calculate, generate the Long Code Mask that satisfies group service confidentiality and sharing.
Parameter is replaced referring to table one:
Parameter Input when calculating privately owned long code Input when calculating the cluster long code
RAND_CHALLENGE Provide RANDC by network side Provide RANDC by network side
ESN The ESN of MS Initiate the ESN of the MS of group calling
AUTH_DATA IMSI_S1 (international travelling carriage identification code) Group service group number GID
SSD_AUTH SSD_A CT_SSD_A[i] (the shared group service SSD_A of i group user)
SAVE_REGISTERS TRUE TRUE
SSD_B SSD_B CT_SSD_B[i] (the shared group service SSD_B of i group user)
AAV 0xC7 0xC7
Table one
In the table one, CT_SSD[0..MAX_CT_GROUP_PER_MS-1] be the parameter that increases newly, wherein MAX_CT_GROUP_PER_MS is the maximum group number that MS supports.Owing to when group service is set, be provided with a plurality of groups, and MS can add a plurality of groups when opening an account, so MS and network side have been stored a plurality of CT_A-key and CT_SSD respectively, a corresponding CT_A-key of group and a CT_SSD, so can use CT_SSD[i] represent wherein which group i represents.
Similar with SSD, CT_SSD[i] be the 128bit number, be divided into 64 bit CT_SSD_A[i] and 64 bit CT_SSD_B[i].
A kind of production method of CT_SSD and the production method of SSD are similar, SSD is generated by the SSD_Generation algorithm by A-key, CT_SSD is then generated with same algorithm by CT_A-key, each group is used identical CT_A-key, do not use different CT_A-key on the same group, when MS opens an account, store CT_A-key of each group at MS and AUC (AC).
Each CT_A-key that organizes of AUC's storage at MS and network side when MS opens an account has several different methods, for example: when MS contracts group service, CT_A-key is stored in the subscriber identify module card and network side of MS.Again for example: when group service is set, CT_A-key is stored in network side, when the MS of the group service of having contracted started shooting for the first time, network side sent to the MS storage with CT_A-key.
When MS contracts group service, CT_A-key is stored in the subscriber identify module card of MS; This MS sends to network side storing with CT_A-key when opening an account.Again for example: when group service is set, CT_A-key is stored in network side, when the MS of the group service of having contracted opened an account, network side was stored CT_A-key through sending to MS after encrypting.
The method that generates CT_SSD by CT_A-key also has multiple, and for example: network side produces a random number and sends to MS, and MS and network side calculate CT_SSD respectively according to this random number and the CT_A-key that stores separately.Again for example: calculate CT_SSD by network side according to the CT_A-key that self stores earlier, the CT_SSD that will calculate sends to MS after encrypting.
Typical case of the present invention uses referring to Fig. 3, and Fig. 3 is the Long Code Mask product process schematic diagram of a preferred embodiment of the present invention.This flow process may further comprise the steps:
Step 301, the MS of the group service of having contracted sends the ESN that comprises group number (GID) and MS to network side, and the ESN of this MS represents with ESN1 in the present embodiment.
After step 302, network side are received the described group calling request of step 301, produce the random number (RANDC) of this group calling; In actual applications, the random number of this group calling (RANDC) can be identical or different to the RANDC that the requirement of confidentiality and group calling last time produce according to the user, if it is high that the user requires confidentiality, then each RANDC difference that produces, handle complexity though do like this, but good confidentiality recommends to use; Otherwise each RANDC that produces can be identical, handles simply though do like this, and confidentiality is relatively poor, does not generally use.
Step 303, network side are used RANDC, the group number (GID) that receives, are initiated the ESN1 of the MS of group calling, and the CT_SSD of this group calculates Long Code Mask.
CT_SSD in the present embodiment is that MS and network side come out by the SSD_Generation algorithm computation with the CT_A-key of storage separately respectively.
The method that present embodiment calculates Long Code Mask is: 2 bits that Long Code Mask is the highest are " 01 "; Low 40 bits are: the CT_SSD by RANDC, the ESN1 of MS that initiates group calling or stack features sign indicating number that this GID sets in advance, group number, this group use earlier the Auth_Signature algorithm, and the voice private mask (VPM) that goes out with the Key_VPM_Generation algorithm computation hangs down 40 bits again.Just, with RAND_CHALLENGE, ESN, AUTH_DATA, SSD_AUTH, the SSD_B parameter that above-mentioned parameter has been replaced the privately owned Long Code Mask algorithm of original CDMA2000, still adopt original privately owned Long Code Mask algorithm to calculate.
Step 304, network side distributes shared channel for this group calling, and with the Long Code Mask that calculates the Traffic Channel parameter is set.
Step 305, network side comprise the ESN1 of the MS of RANDC, group number (GID), initiation group calling by group status message periodicity all Cell Broadcast CBs in the group service area.In the practical application, these information can also send to MS by other reliable transmission flow processs.
Step 306, after the MS of initiation group calling receives broadcast, use the ESN1 of self, if what network side was used is the stack features sign indicating number, here also use the CT_SSD, group number (GID) of stack features sign indicating number, this group, the RANDC that from broadcast, obtains to calculate the same method of Long Code Mask, calculate Long Code Mask according to network side in the step 303.
Step 307, the MS that initiates group calling is provided with the Traffic Channel parameter with the Long Code Mask that calculates.
Step 308 after the MS of this group calling of needs adding receives broadcast, selects to add this group.
Step 309, need to add the MS of this group calling according to the group number (GID) that from broadcast, obtains, from the CT_SSD of storage, find out the CT_SSD corresponding with this group number, use the ESN1 of the MS of the CT_SSD of this group, the RANDC that from broadcast, obtains, group number (GID), initiation group calling, if what network side was used is the stack features sign indicating number, here also use the stack features sign indicating number, calculate the same method of Long Code Mask, calculate Long Code Mask according to network side in the step 303.
Step 310 needs the MS that adds this group calling with the Long Code Mask that calculates the Traffic Channel parameter to be set.
In the present embodiment, network side can be meant mobile switching centre (MSC), and the message in the reality between MS and the MSC sends by base station (BS).MSC can also cooperate with attaching position register (HLR), VLR Visitor Location Register (VLR), AUC (AC) and realizes storing CT_A-key in the practical application.
By the above embodiments as seen, this generation method that is used for the Long Code Mask of group service of the present invention, unique, group service of Long Code Mask and general service Long Code Mask had nothing in common with each other the satisfied fully demand that has realized the group service Channel Sharing in the CDMA2000 system in the inventive method made in the group service that Long Code Mask is maintained secrecy, Long Code Mask has nothing in common with each other, organize between group.And make that group service and general service can be compatible, improve the synthesized competitiveness of equipment supplier's product, and make operator obtain bigger income with low cost.And group service and general service compatibility improve the synthesized competitiveness of equipment supplier's product, and make operator obtain bigger income with low cost.

Claims (12)

1, a kind of generation method that is used for the Long Code Mask of group service is characterized in that this method may further comprise the steps:
1) contracted the travelling carriage (MS) of group service when opening an account, at MS and network side group service KI (CT_A-key) of each group of saveset group business respectively; Generate the group service Shared Secret Data (CT_SSD) of each group respectively at MS and network side according to CT_A-key; Described network side comprises attaching position register (HLR), mobile switching centre (MSC), VLR Visitor Location Register (VLR), AUC (AC);
2) the contracted MS of group service sends the group calling request of the Electronic Serial Number (ESN) comprise group number and MS to network side;
3) network side is received step 2) after the described group calling request, produce the random number (RANDC) of this group calling; And comprise the broadcast of ESN of the MS of RANDC, group number, initiation group calling to group service area broadcasting; Use the ESN of the MS of RANDC, group number, initiation group calling, the CT_SSD of this group to calculate Long Code Mask simultaneously, or use the condition code that the MS place group of RANDC, group number, initiation group calling sets in advance, the CT_SSD of this group to calculate Long Code Mask;
4) after the MS of initiation group calling receives broadcast with the MS that needs this group calling of adding, calculate the same method of Long Code Mask according to the step 3) network side respectively, calculate Long Code Mask.
2, the generation method of Long Code Mask according to claim 1 is characterized in that the method that described MS of step 1) and network side are stored CT_A-key respectively is: during the signatory group service of MS, CT_A-key is stored in the subscriber identify module card and network side of MS.
3, the generation method of Long Code Mask according to claim 1, it is characterized in that, the method that described MS of step 1) and network side are stored CT_A-key respectively is: when group service is set, CT_A-key is stored in network side, when the MS of the group service of having contracted started shooting for the first time, network side sent to the MS storage with CT_A-key.
4, as the generation method of Long Code Mask as described in the claim 3, it is characterized in that: when the MS of the group service of having contracted started shooting for the first time, network side sent to MS after CT_A-key is encrypted.
5, the generation method of Long Code Mask according to claim 1, it is characterized in that, the described method that generates CT_SSD respectively at MS and network side of step 1) is: network side produces a random number and sends to MS, and MS and network side calculate CT_SSD respectively according to this random number and the CT_A-key that stores separately.
6, the generation method of Long Code Mask according to claim 1, it is characterized in that, the described method that generates CT_SSD respectively at MS and network side of step 1) is: calculate CT_SSD by network side according to the CT_A-key of self storage earlier, the CT_SSD that calculates is sent to MS.
As the generation method of Long Code Mask as described in the claim 6, it is characterized in that 7, network side sends to MS with the CT_SSD that calculates after encrypting.
As the generation method of Long Code Mask as described in the claim 1,5,6 or 7, it is characterized in that 8, the method for described generation CT_SSD is: go out CT_SSD by CT_A-key by the SSD_Generation algorithm computation.
9, the generation method of Long Code Mask according to claim 1, it is characterized in that the method for described calculating Long Code Mask is: 2 bits that Long Code Mask is the highest are " 01 "; Low 40 bits are:
By ESN, the CT_SSD of this group of the MS of RANDC, group number, initiation group calling, use the Auth_Signature algorithm earlier, go out voice private mask (VPM) with the Key_VPM_Generation algorithm computation again, and get 40 bits that hang down of the VPM that calculates,
Or the condition code that sets in advance by the MS place group of RANDC, group number, initiation group calling, the CT_SSD of this group, use the Auth_Signature algorithm earlier, go out VPM with the Key_VPM_Generation algorithm computation again, and get 40 bits that hang down of the VPM that calculates.
10, the generation method of Long Code Mask according to claim 1 is characterized in that: the random number of this group calling that produces in the step 3) (RANDC) is identical or different with the RANDC that group calling last time produces.
11, the generation method of Long Code Mask according to claim 1 is characterized in that described step 3) further comprises: network side is that this group calling distributes shared channel, and with the Long Code Mask that calculates the Traffic Channel parameter is set;
Described step 4) further comprises: initiate the MS of group calling and the MS of this group calling of needs adding and with the Long Code Mask that calculates the Traffic Channel parameter is set.
12, the generation method of Long Code Mask according to claim 1, it is characterized in that step 3) is described to comprise the method for broadcast of ESN from the MS of RANDC, group number, initiation group calling to group service area broadcasting is: network side by the group state information to group service area periodic broadcast above-mentioned parameter.
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