CN101335924A - Non-access layer message transmission method, apparatus and system - Google Patents
Non-access layer message transmission method, apparatus and system Download PDFInfo
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- CN101335924A CN101335924A CNA2008101312791A CN200810131279A CN101335924A CN 101335924 A CN101335924 A CN 101335924A CN A2008101312791 A CNA2008101312791 A CN A2008101312791A CN 200810131279 A CN200810131279 A CN 200810131279A CN 101335924 A CN101335924 A CN 101335924A
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Abstract
The invention discloses a non-access layer information transmitting method, a device and a system, wherein a transmitting end transmits information carried with a plurality of non-access layer information to a receiving end, and each non-access layer information includes fields for marking the length of the non-access layer information. The receiving end analyzes each non-access layer information according to the fields included in each non-access layer information in the received information. According to the technical scheme of the invention, a piece of information transmitting a plurality of information is realized, thereby advancing the transmitting efficiency of the non-access layer information.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of non-access layer message transmission method, Apparatus and system.
Background technology
System Architecture Evolution (System Architecture Evolution, abbreviate SAE as) be third generation partner program (3rd Generation Partnership Project, abbreviate 3GPP as) mobile wireless network of future generation, its framework mainly comprises following network element as shown in Figure 1:
Radio network controller (Radio Network Controller, radio network controller), connect by Iu interface and service universal packet wireless business affair support node (Serving Generalpacket radio service support node abbreviates SGSN as).
Enode (Evolved NodeB, abbreviate E-NodeB as), be used to terminal to insert Radio Resource is provided, be connected with gateway (Serving GW) by S1-U interface, and by S1-MME and mobile management entity (Mobility Management Entity abbreviates MME as) connection.
Home subscriber server (Home Subscriber Server abbreviates HSS as): be used for the permanent storage user contracting data, it is connected with MME by the S6 interface, and is connected with SGSN by Gr interface.
(the Packet Data Network of Packet Data Network, abbreviate PDN as): be used to the user to provide professional, be connected with PDN GW (PDN Gateway) by the Gi interface, and by Rx interface and "Policy and Charging Rules Function entity (Policy and Charging RuleFunctionality, abbreviate PCRF as) connect, and PCRF is connected with PDN GW by the S7 interface.
Wherein, network element gateway (Serving Gateway, abbreviate Serving GW or S-GW as), packet data network gateway (Packet Data Network Gateway, abbreviate PDN GW or P-GW as), "Policy and Charging Rules Function entity (Policy and ChargingRule Functionality, abbreviate PCRF as) and mobile management entity (MobilityManagement Entity, abbreviate MME as) constituted packet-based core networks (the Evolved Packet Core of evolution, abbreviate E-Packet Core as), it can reduce delay, allows more wireless access system to insert.Further above-mentioned each network element is described below.
Serving GW is a user entity, be used for process user face data route, termination is in subscriber terminal equipment (the User Equipment of idle condition, abbreviate UE as) SAE carrying (bearer) context of downlink data, management and storage UE, as IP bearer service parameter and network internal routing iinformation etc.Serving GW is the anchor point of 3GPP internal system user face, and a user can only have a Serving GW a moment, and it is connected with PDN GW by the S5 interface, and is connected with MME by the S11 interface.
PDN GW is responsible for the gateway that UE inserts PDN, and distributing user IP address is the mobility anchor point of 3GPP and non-3GPP connecting system simultaneously.The user can insert a plurality of PDN GW at synchronization.Physically, Serving GW and PDN GW may unify.
PCRF is mainly used in the configuration information according to business information and user signing contract information and operator, produces service quality (Quality of Service abbreviates QoS as) rule and the charging regulation of control user data delivery.This functional entity also can be used for controlling foundation and the release that Access Network carries.
MME is the chain of command functional entity, the server that is used for interim storaging user data, be in charge of and store the UE context (such as the UE/ user ID, mobility management states, user security parameters etc.), for the user distributes temporary mark, when residing in its tracing area or its belonging network, is responsible for UE this user is carried out authentication.It is connected with SGSN by the S3 interface, and is connected with gateway by the S11 interface.
Finish functions such as mobile management, session management by Non-Access Stratum (Non-Access Stratum abbreviates NAS as) message between MME and the UE.In order to guarantee the safe transmission of NAS message, increase the safety function of NAS message, can on NAS message, encapsulate a safe head again, if promptly between MME and UE, set up safe context, on NAS message, encapsulate a safe head again, if also do not set up safe context between MME and UE, NAS message just need not encapsulate safe head.Based on this, MME also is used to handle all non-access layer informations between itself and the UE, and triggers the paging at SAE.
Fig. 2 shows does not have the NAS of safe head message format, wherein:
Protocol description symbol (Protocol discriminator, abbreviate PD as) be used to identify the type of NAS message, mobile management (the EPS mobilitymanagement that in the EPS system, has evolution at least, be called for short EMM) and the NAS message of two types of the session managements (EPS sessionmanagement, abbreviation ESM) of evolution.
The value of safe header type (Security header type) can be 0 and 1, and wherein, 0 expression NAS message does not encapsulate safe head, is packaged with general safe head in the 1 expression NAS message.
The packet domain bearing identification of evolution (EPS bearer identity) is used for the different bearer context of identifying user.
Process event sign (Procedure transaction identity) is used to identify an incident, such as revising bearing event.
Type of message (Message type) is used to identify the type of message of NAS message, for example adheres to request, connection request etc.Type of message is unique under same PD, and the type of message under the different PD can be identical.
Other cells that carry (Other information elements as required) are used for the concrete content of identification message.
When the PD of certain NAS message is EMM, then do not need to carry the packet domain bearing identification and the process event sign of evolution in this NAS message.
On the other hand, the NAS message format that safe head arranged as shown in Figure 3, wherein:
Security header category offset is 1, and expression NAS message has general safe head encapsulation.
Message authentication code (Message authentication code) is a security parameter, is used for the legitimacy of message is identified.
Sequence number (Sequence number) is used for the input parameter of protection algorithm integrallty and encrypting and decrypting algorithm.
In actual applications, in a lot of flow processs, may require a piece of news to carry a plurality of NAS message, for example, when UE starts shooting, promptly, when being attached to network, just sets up UE the default bearer of a default PDN of correspondence, like this, when UE initiates initial NAS message, in this message, may need to carry simultaneously Attach Request message and PDN connection request message; In MME sends to the descending NAS direct-sending message of UE, may need to comprise to adhere to and accept message and activate the default bearing context request message, in addition, UE is after the message that receives the MME transmission, initiate up NAS direct-sending message to MME, this message may need to comprise to adhere to be finished message and activates the default bearing context and accept message.
In fact, in above-mentioned processing, send if only a plurality of NAS message are superimposed upon in a piece of news simply, the recipient can't distinguish a plurality of NAS message or a NAS message so, also can't distinguish the boundary between a plurality of NAS message, therefore, in order to simplify protocol processes, increase the definition of message, need a kind of transmission processing method in a piece of news, carry a plurality of NAS message the time.
Summary of the invention
In view of this, the invention provides a kind of non-access layer message transmission method, device and system, to solve the problem of a plurality of NAS message of transmission in a piece of news.
According to an aspect of the present invention, provide a kind of non-access layer message transmission method.
Non-access layer message transmission method according to the present invention comprises: transmitting terminal sends the message that carries a plurality of non-access layer informations to receiving terminal, wherein, all comprises the field that is used to identify this non-access layer information length in each non-access layer information; Receiving terminal carries out parse operation according to the field that each non-access layer information in the message that receives comprises to each non-access layer information.
According to another aspect of the present invention, also provide a kind of non-access layer information dispensing device.
Non-access layer information dispensing device according to the present invention comprises: module is set is used for a plurality of non-access layer informations are carried at a piece of news, and all carry the field that is used to identify this non-access layer information length in each non-access layer information; Sending module is used for sending through the message that module is provided with is set to receiving terminal.
According to a further aspect of the invention, also provide a kind of non-access layer information receiving system.
Non-access layer information receiving system according to the present invention comprises: receiver module is used for the message that carries a plurality of non-access layer informations that receiving end/sending end sends, and wherein, carries the field that is used to identify this non-access layer information length in each non-access layer information; The field that each non-access layer information of message that parsing module is used for receiving according to receiver module carries is carried out parse operation to each non-access layer information.
According to a further aspect of the invention, also provide a kind of non-access layer information transmission system.
Non-access layer information transmission system according to the present invention comprises: transmitting terminal is used for sending the message of carrying a plurality of non-access layer informations to receiving terminal, wherein, all carries the field that is used to identify this non-access layer information length in each non-access layer information; Receiving terminal is used for the message that receiving end/sending end sends, and according to the field that each non-access layer information in the message carries, each non-access layer information is carried out parse operation.
By above-mentioned at least one scheme of the present invention, can realize that a piece of news transmits a plurality of NAS message, and by in each NAS message, carrying the field that is used to identify this NAS message-length, can indicate receiving terminal to carry out parse operation, thereby improve the efficient of NAS transmission of messages according to this field.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the SAE Organization Chart according to prior art;
Fig. 2 is the NAS message format that does not have safe head according to prior art;
Fig. 3 is the NAS message format that safe head is arranged according to prior art;
Fig. 4 is the structured flowchart according to the non-access layer information dispensing device of the embodiment of the invention;
Fig. 5 A is a kind of form according to the NAS message of the embodiment of the invention;
Fig. 5 B is the another kind of form according to the NAS message of the embodiment of the invention;
Fig. 5 C is a kind of form according to the message of a plurality of NAS message of carrying of the embodiment of the invention;
Fig. 5 D is the another kind of form according to the message of a plurality of NAS message of carrying of the embodiment of the invention;
Fig. 6 is the structured flowchart according to the non-access layer information receiving system of the embodiment of the invention;
Fig. 7 is the structured flowchart according to the non-access layer information transmission system of the embodiment of the invention;
Fig. 8 is according to the flow chart of the NAS method for message transmission of the embodiment of the invention;
Fig. 9 initiates the flow chart of attaching process for the method for utilizing the embodiment of the invention and providing realizes UE to MME.
Embodiment
Functional overview
What exist when the present invention is directed in the EPS system between MME and UE transmission NAS message transmits the demand of a plurality of NAS message at a piece of news, a kind of NAS method for message transmission has been proposed, this method is by increasing a field in NAS message, length information by each NAS message of this field record, not only make a piece of news can transmit a plurality of NAS message, and the receiving terminal of this message can carry out parse operation to each NAS message according to the field of this NAS message-length of expression that carries in each NAS message.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
According to the embodiment of the invention, a kind of non-access layer information dispensing device at first is provided, be used to realize transmission to the message of wherein having carried many NAS message.
Fig. 4 is the structured flowchart according to the non-access layer information dispensing device of the embodiment of the invention, as shown in Figure 4, comprises according to the non-access layer information dispensing device of the embodiment of the invention: module 42 is set and is connected to this sending module that module 42 is set 44.Further describe above-mentioned each module below in conjunction with accompanying drawing.
In specific implementation process, according to the form of the NAS message of the embodiment of the invention shown in Fig. 5 A and Fig. 5 B, wherein, Fig. 5 A is the form of the NAS message that does not have safe head in the embodiment of the invention, and Fig. 5 B is the form of the NAS message that safe head is arranged in the embodiment of the invention.
Shown in Fig. 5 A and Fig. 5 B, compared to existing technology, the NAS message of the embodiment of the invention has increased the field (Length) of expression NAS message-length, can determine the border of single NAS message according to this field, in specific implementation process, this field can be represented the entire length of this NAS message, also can only represent the length of other cells of carrying in this NAS message, no matter be above-mentioned which kind of situation, receiving terminal can be judged the boundary of this NAS message according to the information that this field is carried.
In present EPS system, NAS message includes but not limited to EMM message and ESM message, so the order that each dissimilar message is carried in a piece of news or is provided with also can influence to some extent to the transmission course of whole message.The order of carrying at different messages, also provided concrete solution in the embodiment of the invention, for example, when a plurality of NAS message of carrying in a piece of news comprise that promptly EMM message comprises ESM message again, preferably, module 42 is set will be carried at a plurality of NAS message in a piece of news, shown in Fig. 5 C according to carrying the order of carrying ESM message after the EEM message earlier.And,, module 42 then is set will a safe head be set, and this safe head is arranged on before the EMM message of carrying, shown in Fig. 5 D for this message if between transmitting terminal and the receiving terminal safe context is arranged.
According to the embodiment of the invention, a kind of NAS message receiving apparatus also is provided, be used to realize reception to the message of wherein having carried many NAS message.This receiving system is preferably located in the opposite side with above-mentioned dispensing device, and is used with above-mentioned dispensing device.
Fig. 6 is the structured flowchart according to the NAS message receiving apparatus of the embodiment of the invention, and as shown in Figure 6, this device comprises: receiver module 62 and the parsing module 64 that is connected to this receiver module 62.Below further combined with accompanying drawing above-mentioned each module is described.
In specific implementation process, receiver module 62 receiving end/sending end transmitted streams, parsing module 64 reads the content of this code stream in order, when reading the field of the current NAS message-length of sign, according to the content of this field, judges the code stream that current NAS message comprises.
Such as, the value of supposing the field of the current NAS message-length of sign is 10, if this field is represented the length of other cells that carry in the current NAS message, then parsing module 64 continues to read the content of 10 unit lengths backward from the current location of code stream, as the content of current NAS message, code stream afterwards is the content of other NAS message; If this field is represented the entire length of current NAS message, then parsing module 64 deducts this field the length (being assumed to be 2) of the message header of current NAS message, then parsing module 64 continues to read the content of 8 unit lengths backward from the current location of code stream, as the content of current NAS message, code stream afterwards is the content of other NAS message.
According to the embodiment of the invention, a kind of NAS message delivery system also is provided, be used to realize transmission to the message of wherein having carried many NAS message.
Fig. 7 is the structured flowchart according to the NAS message delivery system of the embodiment of the invention, as shown in Figure 7, NAS message delivery system according to the embodiment of the invention comprises: transmitting terminal 72 and receiving terminal 74, wherein, the dispensing device that can be respectively provides according to the foregoing description of transmitting terminal 72 and receiving terminal 74 and receiving system are understood and are implemented.Below further combined with accompanying drawing each part mentioned above is described.
Transmitting terminal 72 is used for sending the message of carrying a plurality of NAS message to receiving terminal 74, wherein, carries the field that is used to identify this NAS message-length in each NAS message.
Receiving terminal 74 is connected 72 by network with transmitting terminal, is used for the message that receiving end/sending end 72 sends, and the field of this NAS message-length of sign that carries according to each NAS message in this message, and each NAS message is carried out parse operation.
According to the embodiment of the invention, a kind of non-access layer message transmission method also is provided, device (with reference to figure 4 and Fig. 6) or system (with reference to figure 7) that this method can use the foregoing description to provide realize.
Fig. 8 is the flow chart according to the NAS method for message transmission of the embodiment of the invention, and as shown in Figure 8, the NAS method for message transmission of the embodiment of the invention mainly comprises following processing (step S802-step S804):
Step S802: transmitting terminal sends the message that carries a plurality of NAS message to receiving terminal, wherein, includes the field that is used to identify this NAS message-length in each NAS message;
Step S804: receiving terminal carries out parse operation according to the field of this NAS message-length of sign in each NAS message in the message that receives to each NAS message.
Further describe above-mentioned each details of handling below.
(1) step S802
Transmitting terminal is carried at a plurality of NAS message when sending to receiving terminal in a piece of news at needs, increases the field of this NAS message-length of sign in each NAS message, then a plurality of NAS message is carried to send in a piece of news to receive.
As mentioned above, the NAS message of mentioning here includes but not limited to EMM message and ESM message.
And when a plurality of NAS message of carrying in a piece of news promptly have EMM message again during ESM message, if do not have safe context between transmitting terminal and the receiving terminal, then the form of this message is shown in Fig. 5 C; If between transmitting terminal and the receiving terminal safe context is arranged, then for this message is provided with a safe head, the form of this message is shown in Fig. 5 D in this case.
Certainly, in practical operation, also may only carry a piece of news in a piece of news, in this case, the form of the NAS message of the embodiment of the invention can be shown in Fig. 5 A (not having safe head) or Fig. 5 B (safe head is arranged).
(2) step S804
Receiving terminal reads wherein each NAS message after receiving the message of carrying a plurality of NAS message that transmitting terminal sends, and the field of this NAS message-length of sign that carries according to each NAS message, and each NAS message is carried out parse operation.If carry a plurality of NAS message in the message that receives, and this message has safe head, then receiving terminal is at first according to the information of safety head, this message is carried out integrity checking and deciphering, read the content of this message, and, parse the content of each NAS message according to the field of this NAS message-length of sign that carries in each NAS message, carry out corresponding process operations according to the content of each NAS message again; If there is not safe head in this message, then do not need this message is carried out integrity checking and deciphering, directly read each NAS message in this message, and, each NAS message is carried out parse operation according to the field of this NAS message-length of sign that carries in each NAS message.
In specific implementation process, the field of sign NAS message-length can be this NAS message entire length, also can be the length of other cells that carry in this message (i.e. the content of this NAS message).
The specific implementation process of the flow process of initiating attaching process to MME with the UE start scheme that to be example provide the embodiment of the invention is described below.As shown in Figure 9, UE comprises to the main flow process that MME initiates to adhere to:
Step S902:UE initiates initial NAS message, and this message comprises the NAS message (adhering to request) of EMM and the NAS message (PDN connection request) of ESM.
If safe context is arranged among the UE, in initial NAS message, safe head is arranged, if there is not safe context among the UE, in initial NAS message, there is not safe head.In specific implementation process, can carry the PDN connection request in the initial NAS message, also can not carry the PDN connection request, for the scheme of the embodiment of the invention is described, be that example describes to carry the PDN connection request in the initial NAS message in the present embodiment.If there is not safe context among the UE, in initial NAS message, carries simultaneously and adhere to request and PDN connection request message, then organized formats such as Fig. 5 C of initial NAS message; If safe context is arranged among the UE, in initial NAS message, carry simultaneously and adhere to request and PDN connection request message, then organized formats such as Fig. 5 D of initial NAS message.
After step S904:MME receives the initial NAS message that UE sends, read wherein adhere to request and PDN connection request message, and the field of this NAS message-length of sign that carries according to each NAS message is carried out parse operation to each NAS message.
Step S906:MME carries out alternately with UE according to the content of each NAS message, carries out security process.
Step S908:MME sets up the default bearing context at S-GW and P-GW.
Step S910:MME sends descending NAS direct-sending message to UE, and this message comprises the NAS message of safe head, EMM, the NAS message of ESM.Wherein, the NAS message of EMM is accepted message for adhering to, and the NAS message of ESM is for activating the default bearing context request.
Step S912:UE receives the descending NAS direct-sending message that MME sends, and reads adhering to and accept message and activate the default bearing context request message wherein, and the field of this NAS message-length of sign that carries according to each message is resolved.
After UE receives descending NAS direct-sending message, at first carry out integrity checking and deciphering, and then read this descending NAS direct-sending message, and carry out corresponding parse operation according to the information of safety head.
Step S914:UE sends out the NAS direct-sending message up to MME, and this message comprises safe head, adhere to and finish message, activate the request of default bearing context acceptance response.
Behind the up NAS direct-sending message that step S916:MME receives and parsing UE sends, upgrade S-GW default bearing context procedures.
As mentioned above, by the present invention, by in NAS message, increasing a field, length information by each NAS message of this field record, make a piece of news can transmit a plurality of NAS message, and the receiving terminal of this message can parse the content of each NAS message according to the length information of each NAS message.By the solution of the present invention, can save transfer resource, particularly Radio Resource, thereby improve the efficient of NAS transmission of messages; And owing to transmit a plurality of NAS message by a piece of news; thereby a plurality of NAS message can a shared safe head; use completeness check can finish integrity protection, saved the time, thereby can further improve the efficient of NAS transmission of messages a plurality of NAS message.
The above is the preferred embodiments of the present 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 protection scope of the present invention.
Claims (8)
1. a non-access layer message transmission method is characterized in that, comprising:
Transmitting terminal sends the message that carries a plurality of non-access layer informations to receiving terminal, wherein, all comprises the field that is used to identify this non-access layer information length in each non-access layer information;
Described receiving terminal carries out parse operation according to the described field in each non-access layer information in the described message to each non-access layer information.
2. method according to claim 1 is characterized in that, the type of described non-access layer information comprises: the mobile management message of evolution and/or the session management messages of evolution.
3. method according to claim 2, it is characterized in that, comprise that at described a plurality of non-access layer informations described transmitting terminal sends the message that carries a plurality of non-access layer informations to receiving terminal and comprises under the situation of session management messages of the mobile management message of evolution and evolution:
Described transmitting terminal carries the order of the session management messages of evolution after according to the mobile management message of carrying evolution earlier, carries described a plurality of non-access layer information in described message, sends described message to described receiving terminal then.
4. method according to claim 3 is characterized in that, if establish safe context between described transmitting terminal and the receiving terminal, then described transmitting terminal is before described receiving terminal sends described message, and described method also comprises:
Described transmitting terminal is provided with a safe head in described message, the position of described safe head is before the mobile management message of described evolution.
5. a non-access layer information dispensing device is characterized in that, comprising:
Module is set, is used for a plurality of non-access layer informations are carried at a piece of news, and in each non-access layer information, all carries the field that is used to identify this non-access layer information length;
Sending module is used for sending the described message that the module setting is set through described to receiving terminal.
6. device according to claim 5, it is characterized in that, comprise at described a plurality of non-access layer informations under the situation of session management messages of the mobile management message of evolution and evolution, described the order that module is carried the session management messages of evolution after according to the mobile management message of carrying evolution earlier is set, described a plurality of non-access layer informations are carried in the described message.
7. a non-access layer information receiving system is characterized in that, comprising:
Receiver module is used for the message that carries a plurality of non-access layer informations that receiving end/sending end sends, and wherein, carries the field that is used to identify this non-access layer information length in each non-access layer information;
Parsing module, the described field that each non-access layer information of described message that is used for receiving according to described receiver module carries is carried out parse operation to each non-access layer information.
8. a non-access layer information transmission system comprises transmitting terminal and receiving terminal, it is characterized in that,
Described transmitting terminal is used for sending the message of carrying a plurality of non-access layer informations to described receiving terminal, wherein, all carries the field that is used to identify this non-access layer information length in each non-access layer information;
Described receiving terminal is used to receive the described message that described transmitting terminal sends, and according to the described field that each non-access layer information in the described message carries, each non-access layer information is carried out parse operation.
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| WO2010088805A1 (en) * | 2009-02-03 | 2010-08-12 | 华为技术有限公司 | Bearer processing method, device and attachment method, device |
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| WO2010088805A1 (en) * | 2009-02-03 | 2010-08-12 | 华为技术有限公司 | Bearer processing method, device and attachment method, device |
| CN102271419A (en) * | 2010-06-04 | 2011-12-07 | 重庆重邮信科通信技术有限公司 | Method for interactive operation between enhanced session management (ESM) module and evolved packet system mobility management (EMM) module of non-access stratum of long term evolution (LTE) terminal |
| CN102271419B (en) * | 2010-06-04 | 2016-03-30 | 重庆重邮信科通信技术有限公司 | LTE terminal Non-Access Stratum ESM and EMM intermodule interactive operation method |
| CN102740287A (en) * | 2012-07-06 | 2012-10-17 | 大唐移动通信设备有限公司 | Non-access stratum (NAS) message coding and decoding method and device |
| CN107318158A (en) * | 2016-04-26 | 2017-11-03 | 中兴通讯股份有限公司 | A kind of message sends, recognized and mobility, the method for session management and node |
| CN106130684A (en) * | 2016-06-27 | 2016-11-16 | 南京邮电大学 | A kind of dense network capacity boost method decoupled based on frequency division multiplexing and up-downgoing |
| CN109842903A (en) * | 2017-11-27 | 2019-06-04 | 华为技术有限公司 | A kind of the determination method, apparatus and system of link information |
| CN109842903B (en) * | 2017-11-27 | 2020-10-09 | 华为技术有限公司 | Method, device and system for determining link information |
| CN112565324A (en) * | 2019-09-26 | 2021-03-26 | 华为技术有限公司 | Method, device and system for transmitting non-access stratum message |
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