CN111818470A - Method and device for parsing trunking communication signaling messages in LTE-M system - Google Patents

Abstract

The present invention provides a method and device for parsing trunking communication signaling messages in an LTE-M system, and a storage medium. The method for parsing the trunking communication signaling message in the LTE-M system includes: (a) capturing the RRC message transmitted in the LTE-M system, and judging the message type of the captured RRC message; (b) judging the RRC message Whether the message is a trunking communication signaling message; (c) identify the message type of the NAS message in the RRC message; (d) parse the signaling message according to the message type of the NAS message; (e) compare the parsing result with the Pre-determined parameters for comparison; (f) displaying analytical results and/or comparison results.

Description

Method and device for parsing trunking communication signaling messages in LTE-M system

technical field

The present invention relates to the field of communications, and more particularly, to a method and an apparatus for parsing trunking communication signaling messages in an LTE-M system.

Background technique

In order to meet the application requirements of urban rail transit interconnection and information transmission integrated service carrying, the Urban Rail Transit Thoroughly Integrated Communication System (LTE-M) specification is formulated on the basis of following the relevant specifications of 3GPP and B-TrunC. The LTE-M specification is a TD-LTE system that meets the needs of urban rail transit integrated services. It can simultaneously transmit video surveillance (IMS) and passenger information systems on the basis of ensuring the communication-based train control system (CBTC) train-ground information transmission. (PIS), train running status monitoring, cluster scheduling services and other information. The standard on which the trunking scheduling service is based is broadband trunking communication (B-TrunC) based on LTE technology.

B-TrunC (Broadband Trunking Communication, Broadband Trunking Communication) is a TD-LTE-based "LTE digital transmission + trunking voice communication" private network broadband trunking system standard formulated by the Broadband Trunking (B-TrunC) Industry Alliance. The B-TrunC Release 1 technical standard was completed and released in succession from 2013 to 2014. In 2015, it became the first LTE broadband trunking standard recommended by ITU to support point-to-multipoint voice and multimedia trunking scheduling for public safety and disaster mitigation applications. On the basis of ensuring compatibility with LTE data services, B-TrunC Release 1 enhances basic voice trunking services and supplementary services, as well as broadband trunking services such as multimedia trunking scheduling, with flexible bandwidth, high spectral efficiency, low latency, and high reliability. It can meet the needs of professional users for voice trunking, broadband data, emergency command and dispatch, etc.

When testing the LTE-M system, it is necessary to capture and analyze the signaling messages transmitted in the system to verify whether the transmitted signaling messages meet the standard requirements. However, there is currently no special tool for parsing, analyzing and counting LTE-M system trunking communication signaling messages, and only manual comparison can be performed on the captured data to see if it is consistent with the standard requirements. The disadvantage of this is that the efficiency is very low and the accuracy is difficult to guarantee.

SUMMARY OF THE INVENTION

In order to overcome one or more deficiencies in the prior art, the present invention provides a method and apparatus for parsing trunking communication signaling messages in an LTE-M system.

According to one aspect of the present invention, a method for parsing trunking communication signaling messages in an LTE-M system is provided, including the following steps: (a) capturing RRC messages transmitted in the LTE-M system, and judging the captured RRC messages The message type of the RRC message, in the case that the RRC message type belongs to the following types, perform step (b); (b) determine whether the RRC message belongs to the trunking communication signaling message, in the case that the RRC message belongs to the trunking communication signaling message , perform step (c); (c) identify the message type of the NAS message in the RRC message; (d) analyze the signaling message according to the message type of the NAS message; (e) compare the analysis result with the predetermined (f) display the parsing result and/or the comparison result; wherein, the message types of RRC include: ULinformation Transfer, RRCConnectionSetup Complete, GroupCallConfig, TrunkingPaging, groupCallRelease, DLTrunkingInformationTransfer, DLTrunkingInformationTransferTrinkingPaging, and DLinformationTransfer.

Further, step (b) includes: judging whether the value of the protocol discriminator of the NAS message in the filtered RRC message is equal to "0000", and if so, determining that the filtered RRC message is a trunking communication signaling message.

Further, step (d) includes: parsing the information element of the signaling message.

Further, the message types of the NAS message include the following 36 types:

(1) TRUNKING REGISTER REQUEST,

(2) TRUNKING DEREGISTER REQUEST,

(3) TRUNKING DEREGISTER ACCEPT,

(4) CALL REQUEST,

(5) FLOOR REQUEST,

(6) CALL COMPLETE,

(7) CALL CONFIRMED,

(8) CALL REJECT,

(9) CALL CONNECT ACK,

(10) CALL CONNECT,

(11) ALERTING,

(12) CALL RELEASE REQUEST,

(13) FLOOR GRANT ACK,

(14) CALL RELEASE RESPONSE,

(15) FLOOR RELEASE,

(16) FLOOR RELEASE ACK,

(17) TRUNKING UPLINK TRANSPORT,

(18) GROUP INFORMATION UPDATE REQUEST,

(19) GROUP INFORMATION UPDATE RESPONSE,

(20) KILL/STUN/REVIVE RESPONSE,

(21) TRUNKING REGISTER ACCEPT,

(22) CALL ACCEPT,

(23) CALL PROCEEDING,

(24)TRUNKING REGISTER REJECT

(25) FLOOR GRANT,

(26) FLOOR WAIT,

(27) FLOOR REJECT,

(28) TRUNKING DOWNLINK TRANSPORT,

(29) KILL/STUN/REVIVEREQUEST,

(30) GROUP INFORMATION UPDATE COMMAND,

(31) VIDEO SOURCE INDICATION,

(32) SPEAKING TIMEOUT INFORM,

(33) FLOOR INFORM,

(34) GROUP CALL RELEASE INDICATION,

(35)GROUP CALL SETUP INDICATION,

(36) TRUNKING REGISTER COMPLETE.

Further, in the case that the RRC is ULinformationTransfer, one of the parsing sub-processes of type (1) to type (20) is performed.

Further, in the case that the RRC is RRCConnectionSetupComplete, a parsing sub-process of one of types (4) to (5) is performed.

Further, in the case that RRC is GroupCallConfig or TrunkingPaging, execute the parsing sub-process in type (35);

When RRC is GroupCallRelease, execute the parsing sub-process in type (34);

In the case that RRC is DLTrunkingInformationTransfer, a parsing sub-process of one of type (31) and type (33) is performed;

When RRC is DLTrunkingInformationTransferTrinkingPaging, execute the parsing sub-process in type (28);

When the RRC is DLinformationTransfer, one of the parsing sub-flows of type (4) to type (5) is performed.

The present invention also provides a device for parsing trunking communication signaling messages in the LTE-M system, including: a capture unit, which is used for capturing the RRC messages transmitted in the system; a judging unit, which is used for judging the captured Whether the RRC message belongs to the trunking communication signaling message; the identification unit, which is used to identify the message type of the NAS message in the RRC message; the parsing unit, which is used to parse the cell according to the message type of the identified NAS message; a comparison unit for comparing the analysis result with a predetermined parameter; and a display unit for displaying the analysis result of the analysis unit and/or the comparison result obtained by the comparison unit.

Further, the judging unit judges and judges whether the value of the protocol discriminator of the NAS message in the filtered RRC message is equal to "0000" and judges the type of the NAS message in the RRC message.

The present invention also provides a non-transitory computer-readable storage medium, which stores a program for causing a computer to perform the above-mentioned method for parsing a trunking communication signaling message in an LTE-M system.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 shows a flowchart of a method for parsing a signaling message of trunking communication in an LTE-M system according to an embodiment of the present invention.

FIG. 2 shows a block diagram of a method for parsing a signaling message of trunking communication in an LTE-M system according to an embodiment of the present invention.

FIG. 3 shows a NAS interface protocol stack of a broadband trunking communication system based on LTE technology according to an embodiment of the present invention.

FIG. 4 shows a schematic diagram of a parsing sub-flow of TRUNKING REGISTER REQUEST according to an embodiment of the present invention.

FIG. 5 to FIG. 51 are schematic diagrams showing each branch sub-process of the main parsing process of FIG. 2 .

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement", "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

FIG. 1 shows a flowchart of a method for parsing a signaling message of trunking communication in an LTE-M system according to an embodiment of the present invention. As shown in FIG. 1, the method for parsing the LTE-M system trunking communication signaling message may include the following steps:

Step S1: Capture the messages transmitted in the system, and determine the message type of the RRC (RadioResource Control, Radio Resource Control) message in the captured messages.

This step is used to filter out RRC messages that may transmit trunking communication signaling messages.

Referring to FIG. 3 , it shows a schematic diagram of the NAS interface protocol stack of the broadband trunking communication system based on the LTE technology. As shown in FIG. 3 , the trunking communication signaling message of the LTE-M system belongs to the NAS (Non-Access Stratum, non-access stratum) signaling message, and the NAS signaling message is carried by the RRC message of the lower layer. Therefore, in order to parse the trunking communication signaling message of the LTE-M system, it is first necessary to analyze and judge the RRC message, so as to screen out the RRC message that may transmit the trunking communication signaling message.

As an example, RRC messages can be captured using wireshark packet capture tools or the like.

In the LTE-M system, there are 8 types of RRC messages that may transmit trunking communication signaling messages, as shown in Table 1 below:

ULinformation Transfer RRCConnectionSetup Complete GroupCallConfig TrunkingPaging groupCallRelease DLTrunkingInformationTransfer DLTrunkingInformationTransferTrinkingPaging DLinformationTransfer

Table 1 RRC message types

If the message type of the RRC message in the captured signaling message belongs to any of the above Table 1, it can be determined that the signaling message belongs to the signaling message that may transmit trunking communication, and the process proceeds to step S2.

Step S2: Determine whether the signaling message belongs to the trunking communication signaling message according to the filtered RRC message.

As an example, it may be determined whether the signaling message is a trunking communication signaling message by judging the type of the NAS message in the filtered RRC message. Table 2 below shows the format of the NAS message. For example, the value of the protocol discriminator ("Protocol discriminator") in the NAS message in the filtered RRC message is obtained, and when the value is equal to "0000", it can be determined that the filtered signaling message is a trunking communication message message; otherwise, it is judged that the filtered signaling message is not a trunking communication signaling message.

The format of the NAS message is shown in Table 2 below. As can be seen, bits 1 to 4 in the first byte are the protocol discriminator.

Table 2 Format of NAS message

In the case that the filtered signaling message is a trunking communication signaling message, the flow proceeds to step S3.

Step S3: Identify the message type ("Message Type") of the NAS message in the RRC message.

As an example, the message type of the NAS message can be determined according to the bit combination of the message.

Table 3 below shows the relationship between the bits of the message and the message type.

Table 3 Message types of trunking communication signaling messages

For example, if the bit is "00000001", it is determined that the signaling message is "TRUNKING REGISTERREQUEST"; if the bit is "00000010", it is determined that the signaling message is "TRUNKING REGISTER ACCEPT", and so on.

Step S4: Parse and display the signaling message according to the message type of the NAS message.

Parsing signaling messages of different message types is parsing the cells in each signaling message and displaying the results.

Each signaling has its own separate format, please refer to the National Standard GB/T 37289-2019 of the People's Republic of China, "Technical Requirements for the Interface of Broadband Trunking Communication (B-TrunC) System Based on LTE Technology (Phase 1) Terminal to Trunking) Core network interface (LTE based Broadband Trunking Communication (B-TrunC) system Technical requirements for interface (Phase 1) Interface between UE and trunking core network" (released on March 25, 2019, implemented on October 1, 2019, national market supervision and management Published by the State Administration for Standardization of China), the full text of GB/T 37289-2019 is incorporated herein by reference as the disclosure content of the present invention.

As an example, FIG. 4 shows a sub-flow chart for parsing the TRUNKING REGISTER REQUEST. As shown in Figure 4, it parses each cell in the TRUNKING REGISTER REQUEST. Referring to Table 5 on page 44 of GB/T 37289-2019, TRUNKING REGISTER REQUEST includes 11 cells, namely "Protocol discriminator", "Spare half octet", "Trunking Procedure transaction identity", "TRUNKING REGISTER REQUEST message identity" ", "Trunking Register Type", "UETrunking Capability", "Stun Status", "Audio Codec Capability", "Video CodecCapability", "Subscriber BCD Number" and "GDN GID List". To parse the TRUNKING REGISTERREQUEST is to parse the 11 cells one by one and display the parsed results.

For the parsing process of other signaling messages, you can refer to GB/T 37289-2019 to parse the information elements of each signaling message, which will not be repeated here.

The above method further includes step S5, that is, comparing the analysis result of step S4 with predetermined parameters. Based on this, it is judged whether the signaling message meets the requirements.

Figure 2 shows the parsing process of different types of RRC messages. 5 to 51 are exploded views of FIG. 2 . As an example, as shown in FIG. 2 , the parsing method may include: judging the type of the RRC message, and when the type of the RRC message is UL information Transfer, judging the type of the NAS message in the UL information Transfer. In the case that the RRC message type is ULinformation Transfer, there are 20 possible Message Types. When the MessageType is TRUNK REGISTER REQUEST, the TRUNK REGISTER REQUEST parsing flow shown in FIG. 5 is entered.

It can also be seen from Figure 2 that in the case where the RRC message type is RRCConnectionSetup Complete, there are two possibilities for the Message Type. When the RRC message type is GroupCallConfig, there is one possibility for the Message Type. When the RRC message type is TrunkingPaging, there is one possibility for the Message Type. When the RRC message type is groupCallRelease, there is one possibility for the Message Type. When the RRC message type is DLTrunkingInformationTransfer, there are two possibilities for the Message Type. When the RRC message type is DLTrunkingInformationTransferTrinkingPaging, there is one possibility for the Message Type. When the RRC message type is DLinformationTransfer, there are 21 possibilities for the Message Type.

The present invention also provides a device for parsing the LTE-M system trunking communication signaling message, which includes: a capture unit, a judgment unit, an identification unit, an analysis unit, and a display unit. Further, the apparatus may further include a comparison unit.

The acquisition unit is used to acquire the RRC messages transmitted in the system. An example of a capture unit could be the wireshark packet capture tool.

The judging unit is used for judging whether the captured RRC message belongs to the trunking communication signaling message. Specifically, the judgment includes two aspects. The first aspect is preliminary judgment. The judgment unit judges the message type of the captured RRC message. That is, in the case that the message type of the captured RRC message belongs to the RRC message type listed in Table 1, it is determined that the RRC message belongs to the signaling message that may transmit the trunking communication. The second aspect is the final judgment. The judgment unit judges the type of the NAS message in the RRC message. Specifically, when the judgment unit judges that the value of the protocol discriminator in the NAS message is "0000", it judges that the filtered signaling message is a trunking communication signaling message.

The identification unit is used to identify the message type of the NAS message in the RRC message. That is, the message type of the signaling message is determined according to the bits in the message.

The parsing unit is configured to parse the information element in the signaling message according to the identified message type of the NAS message.

The display unit is used to display the analysis result of the analysis unit, the comparison result obtained by the subsequent comparison unit, and/or the statistical result of the statistical unit.

The comparison unit is used for comparing the analysis result with the predetermined parameters to obtain the comparison result.

Further, the apparatus for parsing the LTE-M system trunking communication signaling messages may also include a statistics unit, which may be used to perform statistics (obtain statistics) on the parsing results and/or the comparison results, for example, how many messages are counted and meet the /Number and content of non-compliant messages, etc.

The above units can be integrated in a computer as its functional units. Each unit, such as the judgment unit, the analysis unit and the comparison unit, may be independent units, or may be a unit that integrates the functions of some units. The method of the present invention can also be implemented by a storage medium storing a program for causing a computer to perform the above-mentioned analysis method.

The operator can intuitively observe the above analysis results, comparison results and/or statistical results, capture or derive the required results, and know the LTE-M system trunking communication signaling messages according to the analysis results, comparison results and/or statistical results Whether it is consistent with the standard requirements.

The present invention can quickly and accurately parse, analyze and count the signaling messages of the LTE-M system cluster communication, with high efficiency and high accuracy. The parsing sub-process of the present invention parses each signaling message according to the above-mentioned national standards, and provides a standardized parsing process.

Embodiments of the present invention can also be implemented by a computer of a system or device that reads and executes computer-executable instructions recorded on a storage medium (full name "non-transitory computer-readable storage medium"). (eg, one or more programs) to perform the functions of and/or include one or more circuits (eg, an application specific integrated circuit (ASIC)) for performing one or more of the above-described embodiments One or more of the functions in the method, and the method implemented by the computer of the system or device, for example, reading and executing computer-executable instructions from a storage medium to perform one or more of the functions of the above-described embodiments and and/or control one or more circuits to perform the functions of one or more of the above-described embodiments. A computer may include one or more processors (eg, central processing unit (CPU), micro processing unit (MPU)) and may include a network of individual computers or individual processors to read and execute computer executables instruction. For example, computer-executable instructions may be provided to a computer from a network or storage medium. The storage medium may include, for example, a hard disk, random access memory (RAM), read only memory (ROM), memory of a distributed computing system, optical disks such as compact disks (CDs), digital versatile disks (DVDs), or Blu-ray disks (BDs) ^TM ), one or more of flash memory devices, memory cards, etc.

The embodiments of the present invention can also be implemented by the following method, that is, providing software (programs) for performing the functions of the above-mentioned embodiments to a system or device through a network or various storage media, and the computer of the system or device or the central A method in which a processing unit (CPU) and a micro processing unit (MPU) read and execute programs.

The above are only various embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, All should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (10)

1. A method for analyzing trunking communication signaling messages in an LTE-M system is characterized by comprising the following steps:

(a) capturing the RRC message transmitted in the LTE-M system, judging the message type of the captured RRC message, and performing the step (b) under the condition that the message type of the RRC belongs to the following types;

(b) judging whether the RRC message belongs to the trunking communication signaling message or not, and performing the step (c) under the condition that the RRC message belongs to the trunking communication signaling message;

(c) identifying the message type of the NAS message in the RRC message;

(d) analyzing the signaling message according to the message type of the NAS message;

(e) comparing the analysis result with a predetermined parameter;

(f) displaying the analysis result and/or the comparison result;

the message types of the RRC include: ULinformation Transfer, RRCConnectionSetupComplete, GroupCallConfig, TrunkingPaging, GroupCallRelease, DLTrunkingInformationTransfer, DLTrunkingInformationTransferTrinkPaging, and DLinformationTransferter.

2. The method of claim 1, wherein step (b) comprises:

and judging whether the value of the protocol identifier of the NAS message in the screened RRC message is equal to '0000', if so, determining that the screened RRC message is a trunking communication signaling message.

3. The method of claim 1, wherein step (d) comprises:

and analyzing the information element of the signaling message.

4. The method of claim 1, wherein the message types of the NAS message include the following 36 types:

(1)TRUNKING REGISTER REQUEST,

(2)TRUNKING DEREGISTER REQUEST，

(3)TRUNKING DEREGISTER ACCEPT，

(4)CALL REQUEST，

(5)FLOOR REQUEST，

(6)CALL COMPLETE，

(7)CALL CONFIRMED，

(8)CALL REJECT，

(9)CALL CONNECT ACK，

(10)CALL CONNECT，

(11)ALERTING，

(12)CALL RELEASE REQUEST，

(13)FLOOR GRANT ACK，

(14)CALL RELEASE RESPONSE，

(15)FLOOR RELEASE，

(16)FLOOR RELEASE ACK，

(17)TRUNKING UPLINK TRANSPORT，

(18)GROUP INFORMATION UPDATE REQUEST，

(19)GROUP INFORMATION UPDATE RESPONSE，

(20)KILL/STUN/REVIVE RESPONSE，

(21)TRUNKING REGISTER ACCEPT，

(22)CALL ACCEPT，

(23)CALL PROCEEDING，

(24)TRUNKING REGISTER REJECT

(25)FLOOR GRANT，

(26)FLOOR WAIT，

(27)FLOOR REJECT，

(28)TRUNKING DOWNLINK TRANSPORT，

(29)KILL/STUN/REVIVE REQUEST，

(30)GROUP INFORMATION UPDATE COMMAND，

(31)VIDEO SOURCE INDICATION，

(32)SPEAKING TIMEOUT INFORM，

(33)FLOOR INFORM，

(34)GROUP CALL RELEASE INDICATION，

(35)GROUP CALL SETUP INDICATION,

(36)TRUNKING REGISTER COMPLETE。

5. the method according to claim 4, wherein in case of RRC being ULInformationTransfer, a parsing sub-flow of one of type (1) to type (20) is performed.

6. The method of claim 4, wherein the parsing sub-flow of one of type (4) to type (5) is performed in case that RRC is RRCConnectionSetupCompute.

7. The method of claim 4,

in case the RRC is GroupCallConfig or TrunkingPaging, performing a parsing sub-flow in type (35);

in case the RRC is GroupCallRelease, performing a parsing sub-flow in type (34);

in the case that the RRC is DLTrunkingInformationTransfer, performing a parsing sub-flow of one of a type (31) and a type (33);

in the case that the RRC is DLTrunkingInformationTransferTrinkingPaging, executing the parsing sub-flow in the type (28);

in the case where the RRC is DLinformationTransfer, a parsing sub-flow of one of the types (4) to (5) is performed.

8. An apparatus for parsing trunking communication signaling messages in an LTE-M system, comprising:

the device comprises a capturing unit, a sending unit and a receiving unit, wherein the capturing unit is used for capturing RRC messages transmitted in the system;

a judging unit, configured to judge whether the captured RRC message belongs to a trunking communication signaling message;

an identifying unit configured to identify a message type of a NAS message in the RRC message;

the analysis unit is used for analyzing the cell according to the identified message type of the NAS message;

a comparison unit for comparing the analysis result with a predetermined parameter; and

and the display unit is used for displaying the analysis result of the analysis unit and/or the comparison result obtained by the comparison unit.

9. The apparatus for parsing trunking communication signaling messages in an LTE-M system of claim 8 wherein the determining unit determines whether the value of the protocol discriminator of the NAS message in the screened RRC messages is equal to "0000" and determines the type of the NAS message in the RRC message.

10. A non-transitory computer-readable storage medium storing a program for causing a computer to perform the method of parsing a group communication signaling message in an LTE-M system of any one of claims 1 to 7.

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