CN111314856B - Hierarchical examination and tracking device and method for 5G user position information service - Google Patents

Hierarchical examination and tracking device and method for 5G user position information service Download PDF

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CN111314856B
CN111314856B CN202010090377.6A CN202010090377A CN111314856B CN 111314856 B CN111314856 B CN 111314856B CN 202010090377 A CN202010090377 A CN 202010090377A CN 111314856 B CN111314856 B CN 111314856B
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network element
descrambling
lcs client
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lmf
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CN111314856A (en
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吕东
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Guangzhou Aipu Road Network Technology Co Ltd
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Guangzhou Aipu Road Network Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/029—Location-based management or tracking services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/03—Protecting confidentiality, e.g. by encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/60—Context-dependent security
    • H04W12/61—Time-dependent
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/60—Context-dependent security
    • H04W12/63—Location-dependent; Proximity-dependent
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

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

Abstract

The invention provides a hierarchical examination and tracking device and method of 5G user position information service, the device includes scrambling code processing unit, descrambling code processing unit and authority management unit, scrambling code processing unit scrambles ULI, make ULI change from plaintext into ciphertext and send to LCS customer end or LMF network element; the authority management unit allocates corresponding descrambling codes to the LCS client or the LMF network element according to the own authority of the LCS client or the LMF network element; and the descrambling code processing unit performs descrambling code processing on the received ciphertext according to the distributed descrambling code, so that the ULI is changed into a plaintext from the ciphertext. The invention can effectively protect the ULI, and decode the ULI according to the descrambling codes with hierarchical authority to obtain the ULI with different contents. And the process of sending and using the descrambling codes is recorded by adopting a block chain technical method and is synchronous with other nodes of the block chain, so that the data of the descrambling codes are prevented from being falsified and illegally used.

Description

Hierarchical examination and tracking device and method for 5G user position information service
Technical Field
The invention relates to the technical field of communication, in particular to a hierarchical examination and tracking device and method for a user location information service of a 5G core network based on a block chain technology.
Background
In the current 2G/3G/4G mobile communication network, the situation that the user location information service lcs (location services) is illegally stolen exists for a long time, which brings huge hidden troubles to the security of the user location information. Under the current mobile communication architecture, User Location Information (ULI) is always exposed.
According to the specification of 3GPP protocol 23273-G20, the ULI application of the user Location information of LMF (Location Management Function) and GMLC (Gateway Mobile Location Center) in the 5G network is enhanced on the basis of the original 2G/3G/4G, the overall architecture is consistent with the original mode, and the original security holes and hidden dangers still exist in the new 23273-G20. An Illegal user (i.e., IAU) may connect with an LMF and a GMLC network element through an LCS Client (LCS Client) to obtain location information ULI of a target user UE.
Especially, after a large number of intelligent mobile communication terminals are used, a third party illegally obtains the user location information ULI and other user content information through an LCS user location information service interface, which greatly jeopardizes the user data security of mobile communication and the privacy of the user location information ULI.
Chinese patent application publication No. CN1279785C entitled "processing method after modification of privacy information of target UE", describes a processing method after modification of UE information, which protects processing after modification of user location information, and is processing of target UE in an active state, but this publication does not describe how to encrypt location information and a method for managing rights of users.
The invention discloses a self-adaptive hierarchical authentication algorithm in an LCS system with the Chinese patent application publication number of CN1658703A, which is an authentication method between an LCS terminal and a GMLC, and the LCS is accessed as a legal position terminal through the authenticated LCS. GMLC location services, etc. information may be securely accessed.
As can be seen from the above-mentioned publications, in the prior art, an effective method and an improved procedure for how to obtain the location of the user are described, and an authentication and trusted protocol mechanism is also established between the LCS Client and the GMLC to confirm the obtaining of the UE location information ULI of the mobile terminal, authenticate the validity of the LCS Client, and ensure the normal use of the user location information ULI, although the privacy information ULI of the UE user is not exposed, the location information ULI of the user still has a potential risk of being stolen.
Disclosure of Invention
In order to solve the above problems, the present invention provides a device and a method for hierarchical review and tracking of 5G subscriber location information service, which can effectively solve the illegal use of subscriber location information, ensure the reasonable use of subscriber location information based on the LMF and GMLC architectures specified by 3GPP protocol 23273-G20, and protect the security of subscriber location information.
The technical scheme of the invention is as follows:
in a first aspect, the present invention provides a hierarchical auditing and tracking device for 5G user location information service, which comprises a scrambling code processing unit arranged on an AMF network element, a descrambling code processing unit arranged on an LCS client or an LMF network element, and at least one authority management unit arranged in a 5 GC;
the scrambling code processing unit scrambles the user position information, so that the user position information is changed into a ciphertext from a plaintext and is sent to an LCS client or an LMF network element;
the authority management unit distributes corresponding descrambling codes according to the self authority of the LCS client or the LMF network element and sends the descrambling codes to the LCS client or the LMF network element which makes a request;
and the descrambling code processing unit performs descrambling code processing on the received ciphertext according to the distributed corresponding descrambling code, so that the user position information is changed into a plaintext from the ciphertext.
Furthermore, the authority management unit records the sending of the descrambling codes, and prevents the distribution of the descrambling codes from being tampered, illegally revoked or illegally used.
Further, the self authority of the LCS client or the LMF network element includes a geographical location of the LCS client or the LMF network element, a location of the target UE, and a start-stop time of use.
In a second aspect, the present invention provides a hierarchical review and tracking method for a 5G subscriber location information service, comprising the following steps:
step S1, LCS client end sends user location information service request of target UE to GMLC;
step S2, GMLC sends the number request of AMF network element where the target UE is located to UDM;
step S3, the UDM returns the number of the AMF network element where the target UE is currently located to the GMLC;
step S4, GMLC or LMF network element initiates user location information request to AMF network element where target UE is located;
step S5, after receiving the user position information request, the AMF network element where the target UE is located adds a scrambling code to the user position information of the current target UE to change the user position information from a plaintext to a ciphertext and returns the ciphertext to the GMLC or LMF network element;
step S6, GMLC sends the received cipher text to LCS client end which provides user location information service request;
step S7, LCS client or LMF network element sends the descrambling request of the ciphertext to the authority management unit according to the authority value;
step S8, after receiving the request of descrambling code, the authority management unit distributes descrambling code with corresponding authority according to the own authority value of LCS client or LMF network element and returns the descrambling code to LCS client or LMF network element;
and step S9, the LCS client or the LMF network element performs descrambling processing on the ciphertext according to the received descrambling code, and converts the ciphertext into a plaintext.
Further, step S8 includes: and when the descrambling code is returned to the LCS client or the LMF network element, calculating the latest record value of the code value of the descrambling code by using a Pre-hash () function, a Random () function, a timestamp and the characteristic value of the current operation by adopting a block chain technology, sending a message to all LCS clients, LMF network elements and the block chain node of the authority management unit in a block chain, and updating the latest use state of the code value of the descrambling code.
Further, step S9 includes: and calculating the latest record value of the code value of the descrambling code by using a Pre-hash () function, a Random () function, a timestamp and the characteristic value of the current operation by adopting a block chain technology in the descrambling code processing process, sending a message to all LCS clients, LMF network elements and an authority management unit block chain node in a block chain, and updating the latest use state of the code value of the descrambling code.
Further, the self-authority value in step S7 includes a geographical location of the LCS client or the LMF network element, a location of the target UE, and a start-stop time of use.
Further, the LCS client or the LMF network element has different self-authority values and the allocated descrambling codes are different.
The invention has the beneficial effects that:
the invention solves the protection of the user location information ULI of the terminal user UE in the mobile communication network from the source. In a 5GC network, a scrambling Code processing unit S-Code-Unite for scrambling user position information ULI is added in an AMF network element, a plaintext P-ULI is converted into a ciphertext C-ULI, the user position information ULI is transmitted in a ciphertext C-ULI mode, and ULI data are effectively protected. And meanwhile, the LCS Client/LMF network element of the position information ULI is used for obtaining the AKSD code values of the unwrapping code authority of different levels of authority from the RMU, and the calculation of the unwrapping code is carried out to obtain the ULI plain text data of the corresponding level. In the process of using the AKSD, the RMU/LCS Client/LMF adopts a block chain Blockchain technology, and the process of sending and using the AKSD each time is recorded by adopting the block chain technology method, so that the data are synchronized with the RMU/LMF/LCS Client block chain, and the data of the AKSD are prevented from being tampered and illegally used.
Drawings
Fig. 1 is a diagram of the LCS location services architecture of the present invention;
FIG. 2 is a block chain 5G core network user location information based rights management architecture diagram of the present invention;
FIG. 3 is a block diagram illustrating architecture for block chain calculation for LCS location services in accordance with the present invention;
FIG. 4 is a flow chart of the method for hierarchical review and tracking of LCS according to the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example one
The embodiment provides a hierarchical examination and tracking device of a 5G user location information service (LCS), which comprises a scrambling Code processing unit (S-Code-Unit) which is arranged on an AMF network element of a 5GC and used for scrambling user location information ULI, wherein the scrambling Code processing unit is used for scrambling the user location information ULI from plain text-LUI (P-LUI), then the user location information ULI is changed into cipher text Ciphertext-LUI (C-LUI), and then C-LUI data is sent to a location management function network element LMF and an LCS Client side LCS Client.
And at least one Rights Management Unit (RMU) provided in the 5GC network. In the whole 5GC network, a plurality of RMUs can be deployed and distributed in each network physical space, and serve as an independent node of a block chain, and the main functions of the RMUs are as follows:
(1) and distributing descrambling codes (AKSD) to LCS Client/LMF network elements applying for the codes.
(2) As a node of the block chain (Blockchain), the transmission of user location information ULI descrambling codes is recorded, and the AKSD distribution is prevented from being tampered/illegally revoked/illegally used.
The system also comprises a descrambling code processing unit which is arranged in the LCS Client/LMF. In the whole 5GC network, a plurality of LCS Client/LMF network elements are deployed, and a descrambling unit adds 2 main functional characteristics to the LCS Client/LMF network elements, including:
(1) and descrambling the C-ULI ciphertext data from the AMF by acquiring a descrambling code AKSD from the RMU.
(2) As a node of a Blockchain (Blockchain).
The working principle of the invention is as follows: when the S-Code-Unit of AMF carries out scrambling Code processing of target User location information ULI, the authority of LCS Client/LMF (User-Permissions), the geographical range (ULI _ G _ Rang) of the target location information, the Time (Use _ Time) of the used location and the like are added into the C-ULI. Each target user location is provided with basic information for a hierarchical review.
LCS Client/LMF network element receives C-ULI information sent by AMF, LCS Client/LMF network element sends RMU application AKSD descrambling code with integrated authority information such as User-permission Class, User-position information used geographical range (ULI _ G _ Rang _ Class), target User position information used geographical range (User _ Time _ Class) and the like, RMU generates corresponding hierarchical authority unique AKSD descrambling code to LCS Client/LMF network element according to the integrated authority information applied by LCS Client/LMF network element, LCS Client/LMF uses the received unique AKSD code with hierarchical authority to descramble C-ULI, and P-ULI information corresponding to the hierarchical authority is obtained.
And according to the comprehensive authority information of the LCS Client/LMF network element and the classification authority AKSD code generated by the RMU, the classification examination capability of the target user position information of different LCS Client/LMF network element levels is realized.
The classification authority AKSD code applied by the LCS Client/LMF network element to the RMU contains the ID information of the LCS Client/LMF network element, and in the aspect of decoding the C-ULI, the classification authority AKSD code is only effective to the applied LCS Client/LMF network element, and other LCS Client/LMF network elements use the AKSD code to decode other C-ULI.
Example two
The embodiment provides a hierarchical examination and tracking method for a 5G user location information service (LCS), which solves the protection of user location information ULI of an end user UE in a mobile communication network from the source. In a 5GC network, a scrambling Code processing unit S-Code-Unite for scrambling user position information ULI is added in an AMF network element, a plaintext P-ULI is converted into a ciphertext C-ULI, the user position information ULI is transmitted in a ciphertext C-ULI mode, and ULI data are effectively protected. And meanwhile, the LCS Client/LMF network element of the position information ULI is used for obtaining the AKSD code values of the unwrapping code authority of different levels of authority from the RMU, and the calculation of the unwrapping code is carried out to obtain the ULI plain text data of the corresponding level. In the process of using the AKSD, the RMU/LCS Client/LMF adopts a block chain Blockchain technology, and the process of sending and using the AKSD each time is recorded by adopting the block chain technology method, so that the data are synchronized with the RMU/LMF/LCS Client block chain, and the data of the AKSD are prevented from being tampered and illegally used.
The LCS location services system architecture, as shown in fig. 1, mainly relates to the LMF/gmlc (lrf)/LCS Client (LCS Client) configuration. And the user submits the IMSI/IMSDN number and the like of the target UE through the LCS Client to acquire the user location information ULI of the target UE. After receiving a location information ULI request of target UE submitted by an LCS Client, the GMLC queries the number of the current AMF of the target UE, queries the number of the AMF of the current UE to a UDM (Unified Data Management) of a home location of the target UE, and after obtaining the current AMF number fed back by the UDM, the GMLC initiates a location information request of the UE to the AMF of the target UE.
The LMF is defined in R15 of 3GPP, and is newly added in order to better satisfy the scenario that the mobile internet user and the application service function network element AF require the location information of the target UE. In the subscriber location information service, the LMF and the GMLC have the same function.
In an actual scene, the LCS Client/GMLC/LMF is composed of a plurality of LCS clients/GMLC/LMF, and the user selects the corresponding LCS Client/GMLC/LMF service according to the actual situation.
A hierarchical reviewing and tracking method for a location information service (LCS) of a 5G subscriber according to the present embodiment, as shown in fig. 4, includes the following steps:
step S1, the LCS Client initiates a ULI service request for the UE to the GMLC.
Specifically, the following description is provided: the type NI-LR/MT-LR/MO-LR/DLR/ILR of the location information service LCS is outside the scope of the present invention.
Step S2, the gateway mobile location center GMLC sends a request for the number of the mobility management function network element AMF where the target UE is currently located to the unified Data management udm (unified Data management).
Step S3, the unified data management UDM returns the number of the AMF where the target UE is currently located to the GMLC.
Step S4, the gateway mobile location center GMLC or the location management function network element LMF initiates a user location information ULI request to the AMF where the target UE is located.
Step S5, after receiving the user location information ULI request, the AMF where the target UE is located adds scrambling code to the location information ULI of its current target UE, so that it changes from plaintext P-ULI to ciphertext C-ULI and returns it to the gateway mobile location center GMLC or location management function network element LMF.
Specifically, the following description is provided: the user location information ULI is obtained by the RAT signal test value of the access network and the UE independent positioning. The content of the user location information ULI itself is not within the scope of the present invention.
And step S6, the GMLC sends the received ciphertext C-ULI to the corresponding LCS Client.
Step S7, the LCS Client or the location management function network element LMF initiates an application of the C-ULI descrambling code AKSD to the authority management unit RMU according to the own authority value.
The self-authority value comprises the geographical position of the self, the position of the target UE, the use start-stop time and the like.
Step S8, after receiving the request for descrambling code, the right management unit RMU allocates the descrambling code AKSD with corresponding right and returns it to LCS Client or location management function network element LMF according to the own right value of LCS Client or location management function network element LMF.
Wherein the AKSD distributed by the RMU determines the scope of authority of the AKSD according to the LCS privacy policy privacy specified in 3GPP protocol 23273-g20, which is not within the scope of the present invention. And the RMU generates an AKSD descrambling code with a grading authority according to the privacy policy privacy and the LCS Client/LMF comprehensive authority.
Preferably, while returning to the LCS Client/LMF descrambling code, the block chain technique is adopted, the Pre-hash () function, the Random () function, the timestamp and the feature value of the current operation are used to calculate the latest record value of the AKSD code value of the block chain node, a message is sent to all LCS Client/LMF/RMU block chain nodes in the block chain, the latest usage state of the AKSD code value is updated, and the AKSD distribution and usage are prevented from being tampered, illegally revoked and illegally used, as shown in fig. 3.
Node_Blockchain(n)＝
Hash(Pre-hash(n-1),Random(n),Timer(n),AKSD(n))
The Hash () function is a computation function modified according to the Blockchain protocol.
And step S9, the LCS Client or the LMF performs descrambling processing on the ciphertext C-ULI according to the received descrambling code AKSD, and converts the ciphertext C-ULI data into plaintext P-ULI data.
Different LCS clients or LMFs receive unique descrambling AKSD code values from RMU to obtain different grading authority checks. And the AKSD code value obtained by the LCS Client/LMF grants the AKSD code value corresponding to the grading authority according to different authorities of the LCS Client/LMF, the AKSD code values of different grading authorities descramble the ULI values of different grading authorities, and grading examination of different grades of authorities of the target user position information ULI is realized.
Preferably, the descrambling processing process adopts a block chain technology, calculates the latest record value of the latest AKSD of the operation of the block chain node by using the Pre-hash () function, the andom () function, the timestamp and the feature value of the current operation, sends a message to all LCS Client/LMF/RMU block chain nodes in the block chain, updates the latest use state of the AKSD code value, and prevents the AKSD distribution and use from being tampered, illegally revoked and illegally used.
The method of the invention has four outstanding advantages:
(1) and the user position information ULI of the target UE is scrambled on the AMF of the 5GC, and the P-ULI data of the plaintext is changed into C-ULI data of the ciphertext, so that the leakage of the user position information ULI is prevented.
(2) The user location information user LMF/LCS Client acquires the corresponding descrambling AKSD code value from the RMU, and descrambles the ciphertext C-ULI data from the AMF to acquire the corresponding plaintext P-ULI value.
(3) According to the comprehensive authority of the LMF/LCS Client, the RMU generates AKSD descrambling codes with different grading authorities, the AKSK codes have uniqueness and are only used and effective by the applied LCS Client/LMF, the LMF/LCS Client adopts the AKSD codes to decode C-ULI from AMF, ULI information of a target user with the grading authority is obtained, different LMF/LCS Client authorities are realized, and authority examination of the target user information ULI is obtained.
(4) The method adopts a block chain technology, RMU/LMF/LCS Client is used as a basic node of the block chain, and in the sending and using processes of the AKSD code value, according to the method of the block chain technology, the sending and using records are synchronized to each RMU/LMF/LCS Client block chain node, so that the AKSD is prevented from being tampered and illegally used.
By the method, the safety of the user position information ULI data can be effectively protected in the 5GC network.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.

Claims (6)

1. A hierarchical examination and tracking device for 5G user position information service is characterized in that: the system comprises a scrambling code processing unit arranged on an AMF network element, a descrambling code processing unit arranged on an LCS client or an LMF network element, and at least one authority management unit arranged in a 5 GC;
the scrambling code processing unit scrambles the user position information, so that the user position information is changed into a ciphertext from a plaintext and is sent to an LCS client or an LMF network element;
the authority management unit distributes corresponding descrambling codes according to the self authority of the LCS client or the LMF network element and sends the descrambling codes to the LCS client or the LMF network element which makes a request;
and the descrambling code processing unit performs descrambling code processing on the received ciphertext according to the distributed corresponding descrambling code, so that the user position information is changed into a plaintext from the ciphertext.
2. The hierarchical review and tracking device for 5G subscriber location information service as claimed in claim 1, wherein: the authority management unit records the sending of the descrambling codes and prevents the distribution of the descrambling codes from being tampered, illegally revoked or illegally used.
3. The hierarchical review and tracking device for 5G subscriber location information service as claimed in claim 1, wherein: the self authority of the LCS client or the LMF network element comprises the geographical position of the self, the position of the target UE and the use start and stop time.
4. A hierarchical examination and tracking method for 5G user location information service is characterized in that: the method comprises the following steps:
step S1, LCS client end sends user location information service request of target UE to GMLC;
step S2, GMLC sends the number request of AMF network element where the target UE is located to UDM;
step S3, the UDM returns the number of the AMF network element where the target UE is currently located to the GMLC;
step S4, GMLC or LMF network element initiates user location information request to AMF network element where target UE is located;
step S5, after receiving the user position information request, the AMF network element where the target UE is located adds a scrambling code to the user position information of the current target UE to change the user position information from a plaintext to a ciphertext and returns the ciphertext to the GMLC or LMF network element;
step S6, GMLC sends the received cipher text to LCS client end which provides user location information service request;
step S7, LCS client or LMF network element sends the descrambling request of the ciphertext to the authority management unit according to the authority value;
step S8, after receiving the request of descrambling code, the authority management unit distributes descrambling code with corresponding authority according to the own authority value of LCS client or LMF network element and returns the descrambling code to LCS client or LMF network element;
and step S9, the LCS client or the LMF network element performs descrambling processing on the ciphertext according to the received descrambling code, and converts the ciphertext into a plaintext.
5. The hierarchical review and tracking method for 5G subscriber location information services according to claim 4, wherein: the self-authority value in step S7 includes the geographical location of the LCS client or the LMF network element, the location of the target UE, and the start-stop time of use.
6. The hierarchical review and tracking method for 5G subscriber location information services according to claim 4, wherein: the LCS client or the LMF network element has different self authority values and different allocated descrambling codes.
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