CN109327810B - Subway PIS service multicast method and device based on LTE broadband trunking communication - Google Patents

Subway PIS service multicast method and device based on LTE broadband trunking communication Download PDF

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CN109327810B
CN109327810B CN201811150996.9A CN201811150996A CN109327810B CN 109327810 B CN109327810 B CN 109327810B CN 201811150996 A CN201811150996 A CN 201811150996A CN 109327810 B CN109327810 B CN 109327810B
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pis
cluster
service
multicast
core network
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CN109327810A (en
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王璐
王小平
王芳
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Beijing Zte Gundam Communication Technology Co ltd
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Beijing Zte Gundam Communication 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
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft

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  • Computer Networks & Wireless Communication (AREA)
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  • Aviation & Aerospace Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The application discloses a method and a device for multicasting subway PIS service based on LTE broadband trunking communication, wherein the method comprises the following steps: the cluster core network configures a PIS cluster group and sets a multicast IP; initiating group calling by a cluster core network; the PIS server sends a PIS service message with a multicast IP to a cluster core network; the cluster core network multicasts a GTP-U message comprising a PIS service message and a multicast IP to an eNB; the eNB sends the PDCP message containing the payload data to the terminal; the terminal receives and analyzes the PDCP message, and if the multicast IP contains the address of the terminal, the PIS service is played. The application also provides a device suitable for the method. Compared with the traditional subway PIS service multicast method and device, the method and device have the advantages of large system capacity, high frequency utilization rate and low manufacturing cost.

Description

Subway PIS service multicast method and device based on LTE broadband trunking communication
Technical Field
The application relates to the technical field of mobile communication, in particular to a method and a device for multicasting a subway PIS service based on LTE broadband trunking communication.
Background
Passenger Information Systems (PIS) are service systems for providing various Information to passengers in the subway. The passenger information system relies on a multimedia network technology, takes a computer system as a core, and takes a station display terminal and a vehicle-mounted display terminal as media to provide information service for passengers.
An LTE broadband trunking communication system is a system that can provide mobile dispatch services to professional or public users, and represents the development direction of private mobile communication networks. The system has the advantages of large system capacity, high frequency utilization rate and multiple functions, and is the mainstream technology in the field of trunking communication at present. Taking an LTE broadband cluster B-Trunc system architecture as an example, a method for implementing subway PIS service multicast based on LTE broadband cluster communication is described herein. However, the implementation method of the invention can be applied to various LTE broadband trunking systems, and is not limited to the LTE broadband trunking system with the B-trunk architecture.
In the LTE broadband trunking communication B-Trunc system, a basic network architecture comprises the following logic function modules and subsystems:
LTE broadband trunking terminal. Besides supporting the packet data transmission service based on the IP, the LTE broadband trunking terminal should also support broadband trunking service and functions.
LTE broadband cluster base station. The LTE broadband trunking base station enhances the function of supporting trunking services on the basis of meeting the function of the standard LTE base station, and supports the access of an LTE data terminal and an LTE broadband trunking terminal.
LTE broadband cluster core network. The LTE broadband cluster core network is used for enhancing and supporting cluster service functions on the basis of meeting the standard LTE core network functions, and comprises five logic entities, namely eNME, xGW, eHSS, TCF and TMF.
The subway wireless communication technology based on LTE, the transmission of PIS business using multicast technology, there are several common schemes at present:
the wireless unicast scheme adopts a point-to-point unicast mode between a wireless side and a base station and a core network, and under the condition of large PIS video media flow, air interface resources and transmission between the core network and the base station become bottlenecks.
According to the LTE eMBMS scheme, a standard LTE protocol multicast broadcast architecture is adopted in the system, the core network EPC and the base station are required to support an eMBMS multicast function, and the related network elements of the eMBMS are required to be added, so that the overhead and the cost of the system are increased.
Disclosure of Invention
The application provides a method and a device for multicasting the subway PIS service based on LTE broadband trunking communication, which solve the problems of small system capacity and low frequency utilization rate of the traditional method and device for multicasting the subway PIS service.
The embodiment of the application provides a subway PIS service multicast method based on LTE broadband trunking communication, which comprises the following steps:
the cluster core network configures a PIS cluster group for each PIS multicast service, and sets a unique multicast IP (Internet protocol) of each PIS cluster group; the members of the PIS cluster group comprise terminals for receiving PIS services; the multicast IP comprises the address of a terminal for receiving the PIS service;
the cluster core network initiates group calling according to the calling range of each PIS cluster group;
the PIS server sends a PIS service message to a cluster core network, wherein the PIS service message carries multicast IP information;
the cluster core network multicasts a GTP-U message to an eNB, wherein payload data of the GTP-U message comprises a PIS service message and a multicast IP; the eNB receives the GTP-U message, acquires payload data, encapsulates the payload data into a PDCP message according to an air interface protocol, and sends the PDCP message to the terminal;
the terminal receives the PDCP message, payload data is obtained and submitted to an application layer, the application layer analyzes the multicast IP in the payload data, and if the multicast IP contains the address of the terminal, the PIS service is played.
Preferably, the call range of each PIS cluster group is one TA set or one eNB set.
Preferably, the terminal receiving the PIS service is a TAU or a CPE.
Preferably, the data in the PIS service message is video data or audio data.
As an embodiment for further optimizing the multicast method for the subway PIS service based on the LTE broadband trunking communication of the present application, when the trunking core network sets the unique multicast IP of each PIS trunking group, it also sets a unique port number for each PIS trunking group, the PIS server also has port number information when sending the PIS service packet, and the trunking core network and the terminal analyze the port number information when receiving the PIS service packet.
Optimally, the cluster core network dynamically maintains the PIS cluster group call to ensure that the call is permanently online, and the method comprises the following steps: the PIS cluster group calling does not have a speaking right application release mechanism, and the cluster core network completely forwards the received PIS service message; the cluster core network does not start the inactive idle timer of the common cluster group calling, and keeps the PIS cluster group calling when there is or there is no service flow; if the eNB exits the call abnormally, the cluster core network actively reestablishes the connection with the eNB; if the PIS group calling is abnormally released, the cluster core network initiatively reestablishes the whole calling.
The embodiment of the present application further provides a device for multicasting a subway PIS service based on LTE broadband trunking communication, including: PIS server, cluster core network, eNB, terminal: the PIS server is used for sending a PIS service message to the cluster core network; the cluster core network is used for enhancing the function of supporting the cluster service on the basis of meeting the standard LTE core network function, configuring PIS cluster groups, initiating group calling according to the calling range of each PIS cluster group, receiving PIS service messages sent by a PIS server, packaging payload data into GTP-U messages and multicasting the GTP-U messages to an eNB; the eNB enhances the function of supporting the cluster service on the basis of meeting the standard LTE base station function, receives the GTP-U message, acquires payload data, encapsulates the payload data into a PDCP message according to an air interface protocol and sends the PDCP message to the terminal; and the terminal is used for receiving and analyzing the PDCP message and finishing PIS service playing.
Preferably, the system further comprises a play controller, configured to receive the payload data forwarded by the terminal and complete the playing of the PIS service.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
according to the invention, the LTE broadband trunking communication system deployed in the subway is used as a transmission channel of the PIS service of the subway, firstly, a multicast sending mode is adopted for the PIS multicast message from the PIS service to the trunking core network and then to the transmission network between eNBs, and the occupation of the PIS multicast service on the transmission bandwidth is reduced as much as possible. Secondly, the wireless side also adopts a sharing bearing mode to realize the transmission of the PIS service at the air interface, thereby saving wireless resources. The invention realizes the multicast of the subway PIS service and reduces the overhead and the cost of the system. Therefore, compared with the traditional subway PIS service multicast method and device, the method and device have the advantages of large system capacity, high frequency utilization rate and low manufacturing cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a network framework diagram of a digital trunking communication system in an embodiment of a subway PIS service multicast method based on LTE broadband trunking communication;
fig. 2 is a schematic diagram of a system structure of a subway PIS service LTE wireless unicast scheme in the prior art;
fig. 3 is a schematic diagram of a system structure of a subway PIS service LTE eMBMS scheme in the prior art;
fig. 4 is a flowchart of an embodiment of a subway PIS service multicast method based on LTE broadband trunking communication;
fig. 5 is a flowchart of group call establishment of a PIS cluster group in an embodiment of a subway PIS service multicast method based on LTE broadband cluster communication;
fig. 6 is a schematic diagram of a media stream protocol stack of a PIS service in an embodiment of a subway PIS service multicast method based on LTE broadband trunking communication;
fig. 7 is a schematic structural diagram of an embodiment of a subway PIS service multicast device based on LTE broadband trunking communication according to the present invention;
fig. 8 is a schematic structural diagram of another embodiment of a subway PIS service multicast device based on LTE broadband trunking communication according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a network framework diagram of a digital trunking communication system in an embodiment of a subway PIS service multicast method based on LTE broadband trunking communication. The embodiment of the invention is based on an LTE broadband trunking communication B-trunk system, and the network architecture of the system comprises the following logic function modules and subsystems:
LTE broadband trunking terminal: besides supporting the packet data transmission service based on the IP, the LTE broadband trunking terminal should also support broadband trunking service and functions.
LTE broadband cluster base station: the LTE broadband trunking base station enhances the function of supporting trunking services on the basis of meeting the function of the standard LTE base station, and supports the access of an LTE data terminal and an LTE broadband trunking terminal.
LTE broadband trunking core network: the LTE broadband cluster core network is used for enhancing and supporting cluster service functions on the basis of meeting the standard LTE core network functions, and comprises five logic entities, namely eNME, xGW, eHSS, TCF and TMF.
The eHSS is a subscription data management center and an authentication center and is divided into two logic units of an LTE data subscription management HSS and a cluster subscription data management THSS.
The eMME is a mobility management entity, which is responsible for mobility and bearer management. In addition to supporting the basic LTE function, the eMME also needs to support the following cluster enhancement functions: clustered NAS signaling and its security, selection of xGW, clustered bearer management, mobility management of clustered services, access control, and session management.
xGW is composed of two logic network elements of SGW and PGW. xGW in addition to supporting basic LTE functionality, it is also necessary to support the following cluster enhancement functions: cluster bearer establishment/modification and deletion, cluster data routing and forwarding.
The TCF is responsible for control and management of the trunking services, and has the following main functions: the support includes multimedia cluster service dispatching of voice/video/data, authentication and authorization of cluster service, cluster registration and cancellation, establishment and release of cluster call, talk right management, cluster management functions such as remote stun resurrection/dynamic recombination and the like, and group information subscription and updating.
The TMF is responsible for data transmission of the trunking service, and has the following main functions: the method comprises the following steps of cluster user plane management, routing and forwarding of cluster service data, and copying and distributing of the cluster service data.
Fig. 2 is a schematic diagram of a system structure of a subway PIS service LTE wireless unicast scheme in the prior art. An LTE unicast bearer resource is established between a TAU (Train Access Unit, a special terminal) or a cpe (customer Premise equipment) of each Train to an eNB and between the eNB and a core network, where the core network includes MME, SGW and PGW network elements, a transit between the terminal and the eNB is Uu, an interface between the eNB and the MME is S1-MME, an interface between the eNB and the SGW is SI-U, and an interface between the SGW and the PGW is S5. An interface between the PIS server and the PGW is an SGi, the PIS server sends and sends a multicast data packet to a core network, the multicast data packet can be encapsulated by a GRE tunnel and the like, and the core network sends and sends the multicast message to vehicle-mounted stations of each train through an eNB. According to the scheme, a point-to-point unicast mode is adopted between a wireless side and a base station and a core network, and under the condition that PIS video media flow is large, air interface resources and transmission between the core network and the base station become bottlenecks.
Fig. 3 is a schematic diagram of a system structure of a subway PIS service LTE eMBMS scheme in the prior art. The system adopts a standard LTE protocol multicast broadcast architecture, and needs to be configured with logic network elements such as BM-SC, MBMS-GW, etc., wherein the interface between the terminal and the eNB is Uu, the interface between the eNB and the MCE is M2, the interface between the MCE and the MME is M3, the interface between the eNB and the MBMS-GW is M1, the interface between the BM-SC and the PGW is SGi, and the interface between the MBMS-GW and the BM-SC is SGmb or SGi-mb. The BM-SC is responsible for detecting and receiving PIS service messages from the PIS server, and the PIS service messages are sent to all eNB in a multicast area in a multicast mode through MBMS-GW, and then sent to the terminal through an air interface multicast channel by the eNB. According to the scheme, a core network and a base station are required to support an eMBMS multicast function, and related network elements of the eMBMS are required to be added, so that the overhead and cost of the system are increased. Terminals also need to support the eMBMS protocol, and terminal chips currently supporting eMBMS have a large gap from true business.
Fig. 4 is a flowchart of an embodiment of a multicast method for a subway PIS service based on LTE broadband trunking communication. The subway PIS service multicast method based on LTE broadband trunking communication provided by the embodiment of the application comprises the following steps:
step 11: the cluster core network configures a PIS cluster group for each PIS multicast service, and sets a unique multicast IP (Internet protocol) of each PIS cluster group; the members of the PIS cluster group comprise terminals for receiving PIS services; the multicast IP includes an address of a terminal receiving the PIS service.
The cluster core network configures a PIS cluster group for each PIS multicast service, a plurality of PIS cluster groups can be configured for a plurality of PIS multicast services, multicast IPs corresponding to the PIS cluster groups are set, and the multicast IP of each PIS cluster group is unique. The cluster core network configures a call range for each PIS cluster group, and the call range may be a TA set or an eNB set. The members of the PIS cluster group comprise terminals for receiving PIS services, and the terminals can be TAUs or CPEs and the like. When the cluster core network group information is updated, the terminal receiving the PIS service can obtain the PIS cluster group information to which the terminal belongs.
For example, a cluster core network configures a PIS cluster group for a PIS multicast service, and the multicast IP corresponding to the PIS cluster group is selected from 224.0.1.0-239.255.255.255, for example, the set multicast IP is 224.0.1.0. And the cluster core network configures a calling range for the PIS cluster group, wherein the calling range is an eNB set. The members of the PIS cluster group comprise terminals for receiving PIS services, the terminals are TAUs for example, and all terminals in the group obtain PIS cluster group information to which the terminals belong through cluster core network group information updating.
Step 12: the cluster core network initiates a group call according to the call range of each PIS cluster group.
The cluster core network initiates PIS cluster group calling according to the configured calling range, the calling range is an eNB set, the cluster core network is connected with the eNB, and the eNB is connected with the terminals in the group, so that the terminals in the group are called in the group calling. The PIS cluster group calling adopts an LTE broadband cluster communication technology, a transmission channel between the cluster core network and the eNB adopts a multicast mode, and an air interface between the eNB and the terminal adopts a downlink shared channel mode. And if a plurality of PIS cluster groups are configured in the core network, initiating the group calling of the plurality of PIS cluster groups.
For example, the multicast IP corresponding to a PIS cluster group in which the cluster core network is a PIS multicast service is 224.0.1.0, and the call range configured by the cluster core network for the PIS cluster group is an eNB set. The cluster core network initiates a PIS cluster group calling according to the configured calling range, the cluster core network establishes connection with the eNB in a multicast mode, and the eNB establishes connection with the PIS cluster group through a terminal in a downlink shared channel mode.
Step 13: and the PIS server sends a PIS service message to the cluster core network, wherein the PIS service message carries multicast IP information.
And the PIS server sends a PIS service message to the cluster core network, wherein the PIS service message carries multicast IP information. The core network detects and filters the PIS service message aiming at the fixed multicast IP, and only receives the PIS service message with the destination address of the appointed multicast IP.
For example, the PIS server sends a PIS service message to a cluster core network, the PIS service message carries a multicast IP of, for example, 224.0.1.0, the core network detects and filters the PIS service message, and if the multicast IP to be received is also 224.0.1.0, the PIS service message is received.
Step 14: and the cluster core network multicasts the GTP-U message to the eNB, wherein the payload data of the GTP-U message comprises a PIS service message and a multicast IP.
The cluster core network receives a PIS service message sent by a PIS server, positions a PIS cluster group call according to the multicast IP of the PIS service message, encapsulates the PIS service message into a GTP-U message, multicasts the GTP-U message to an eNB, and the GTP-U message comprises the PIS service message and the multicast IP and also comprises a UDP (user datagram protocol) header, a GTP-U message header and the like.
For example, the cluster core network receives a PIS service message sent by a PIS server, and if the multicast IP of the PIS service message is 224.0.1.0, the cluster core network locates a PIS cluster group call whose multicast IP is 224.0.1.0. And then the cluster core network encapsulates the PIS service message into a GTP-U message, and multicasts the GTP-U message to the eNB, wherein the GTP-U message comprises the PIS service message and a multicast IP, and the multicast IP is 224.0.1.0.
Step 15: and the eNB receives the GTP-U message, acquires payload data, encapsulates the payload data into a PDCP message according to an air interface protocol, and sends the PDCP message to the terminal.
The method comprises the steps that an eNB receives a GTP-U message sent by a cluster core network, detects a multicast IP in the GTP-U message, and receives the GTP-U message if the multicast IP is in a multicast group of the eNB, wherein the eNB acquires a multicast IP address from the cluster core network to the eNB from the cluster core network side when PIS cluster group calling establishes a downlink broadcast bearer, and adds the acquired multicast IP to the multicast group. And the eNB receives the GTP-U message and then processes the GTP-U message, removes a GTP-U message header and obtains payload data, wherein the payload data comprises a PIS service message, a multicast IP (Internet protocol) and a UDP (user Datagram protocol) header. And the eNB encapsulates the payload data into a PDCP message according to an air interface protocol and sends the PDCP message to the terminal through a group calling shared channel TGTCH.
For example, an eNB receives a GTP-U packet sent by a trunking core network, detects a multicast IP in the GTP-U packet, detects that the multicast IP is 224.0.1.0, and receives the GTP-U packet in a multicast group of the eNB. And then the eNB processes the GTP-U message, removes a GTP-U message header and obtains payload data, wherein the payload data comprises a PIS service message and a multicast IP. And the eNB encapsulates the payload data into a PDCP message according to an air interface protocol, and sends the PDCP message to the terminal through a group calling shared channel TGTCH, wherein the multicast IP contained in the payload data in the PDCP message is 224.0.1.0.
Step 16: the terminal receives the PDCP message, payload data is obtained and submitted to an application layer, the application layer analyzes the multicast IP in the payload data, and if the multicast IP contains the address of the terminal, the PIS service is played.
And the terminal receives the PDCP message, completes the processing of the PDCP protocol layer according to the air interface protocol stack, obtains payload data and delivers the payload data to the application layer. The application layer analyzes that the multicast IP in the payload data is the same as the multicast IP, the payload data is forwarded to a play controller, and the play controller completes PIS service play;
after receiving the air interface message, the terminal UE completes the PDCP protocol layer processing according to the air interface protocol stack to obtain payload Data, then delivers the payload Data to the application layer, the application layer analyzes the payload message delivered by the PDCP protocol layer, finds that the IP address is a multicast IP address, directly forwards the message (comprising the multicast IP address, a UDP header and PIS Data) to the play controller, and the play controller completes the PIS service play.
Preferably, the call range of each PIS cluster group is one TA set or one eNB set.
As in step 11, the trunking core network configures one PIS trunking group for each PIS multicast service, and a call range needs to be configured for each PIS trunking group during configuration, where the call range may be one TA set or one eNB set, or other, and needs to be determined according to the actual situation of the network structure.
Preferably, the terminal receiving the PIS service is a TAU or a CPE.
As in step 11, the cluster core network configures a PIS cluster group for each PIS multicast service, where the members of the PIS cluster group include terminals receiving the PIS service, where the terminals receiving the PIS service are generally TAU or CPE, or others, and need to be determined according to the actual situation of the network structure.
Preferably, the data in the PIS service message is video data or audio data.
In the method related to the present invention, the data in the transmitted PIS service message is data played by the terminal receiving the PIS service, generally video data or audio data, and may be other data, depending on the actual application requirements.
As an embodiment for further optimizing the multicast method for the subway PIS service based on the LTE broadband trunking communication of the present application, when the trunking core network sets the unique multicast IP of each PIS trunking group, it also sets a unique port number for each PIS trunking group, the PIS server also has port number information when sending the PIS service packet, and the trunking core network and the terminal analyze the port number information when receiving the PIS service packet.
In step 11, when the cluster core network sets the unique multicast IP of each PIS cluster group, it also sets a unique port number for each PIS cluster group, and for the PIS server, one multicast IP plus one multicast port uniquely identifies one PIS multicast service. The PIS server has multicast IP and port number information when sending the PIS service message, when the cluster core network and the terminal receive the PIS service message, the multicast IP and the port number information need to be analyzed simultaneously, and when the multicast IP and the port number simultaneously meet the requirement in a multicast group to be received, the PIS service message is received.
For example, the cluster core network receives a PIS service message sent by a PIS server, where the multicast IP of the PIS service message is 224.0.1.0 and the port number is 12, and the cluster core network locates a PIS cluster group call where the multicast IP is 224.0.1.0 and the port number is 12. And then the cluster core network encapsulates the PIS service message into a GTP-U message and multicasts the GTP-U message to the eNB, wherein the GTP-U message comprises the PIS service message, a multicast IP and a port number, wherein the multicast IP is 224.0.1.0 and the port number is 12. And then the eNB receives a GTP-U message sent by the cluster core network, detects the multicast IP and the port number in the GTP-U message, detects that the multicast IP is 224.0.1.0 and the port number is 12, and receives the GTP-U message in the multicast group of the eNB. And then the eNB processes the GTP-U message, removes a GTP-U message header and obtains payload data, wherein the payload data comprises a PIS service message, a multicast IP and a port number. And the eNB encapsulates the payload data into a PDCP message according to an air interface protocol, and sends the PDCP message to the terminal through a group calling shared channel TGTCH, wherein the PDCP message contains 224.0.1.0 multicast IP and 12 port number of the payload data.
Optimally, the cluster core network dynamically maintains the PIS cluster group call to ensure that the call is permanently online, and the method comprises the following steps: the PIS cluster group calling does not have a speaking right application release mechanism, and the cluster core network completely forwards the received PIS service message; the cluster core network does not start the inactive idle timer of the common cluster group calling, and keeps the PIS cluster group calling when there is or there is no service flow; if the eNB exits the call abnormally, the cluster core network actively reestablishes the connection with the eNB; if the PIS group calling is abnormally released, the cluster core network initiatively reestablishes the whole calling.
In the invention, a cluster core network dynamically maintains a PIS cluster group call, and the specific measures comprise: the PIS cluster group calling does not have a speaking right application release mechanism, and the core network forwards all the received PIS service messages; the core network does not start the inactive idle timer of the common cluster group calling, and does not release the PIS cluster group calling because of no service flow; if abnormity occurs, for example, when the eNB abnormally exits the call, the cluster core network can actively reestablish the connection with the eNB to ensure the maintenance of the call; if an exception occurs, for example, when the PIS group call is released abnormally, the cluster core network will actively reestablish the whole call.
Fig. 5 is a flowchart of group call establishment of a PIS cluster group in an embodiment of a subway PIS service multicast method based on LTE broadband cluster communication. In step 12 of the embodiment of the present invention, the step of establishing the group call of the PIS cluster group is as follows:
(1) after the cluster core network is started successfully, initiating a PIS cluster group calling according to a preset calling range of the PIS cluster group; the cluster core network sends a GROUP CALL CONTEXT SETUP REQUEST message to all the eNBs in the calling range, informs the eNBs to establish a CONTEXT for the cluster, establishes a cluster shared bearer T-RAB for PIS data stream push-down, carries Multicast IP attribute Multicast in the message, fills in media plane Multicast IP from the core network to the eNBs, and informs the eNBs to join in a Multicast GROUP. Carrying NAS message GROUP CALL SETUP INDICATION to the terminal, wherein the message carries the Call ID allocated for the CALL, the Call Type is Video push-down, and the Video Description carries the PIS multicast IP and PIS multicast port of the PIS service corresponding to the GROUP so as to inform the terminal to analyze the PIS service message.
(2) And the eNB sends a sounding Paging message carrying sounding group ID, group priority, G-RNTI and the like to page the terminal.
(3) The eNB sends a GROUP Call Config on a TCCH channel, gives access stratum configuration parameters of a GROUP TTCH, and also comprises NAS message GROUP Call SETUP INDICATION.
(4) And the eNB responds to the GROUP CALL CONTEXT SETUP RESPONSE to inform the core network that the establishment of the GROUP CONTEXT is successful.
Fig. 6 is a schematic diagram of a media stream protocol stack of a PIS service in an embodiment of a subway PIS service multicast method based on LTE broadband trunking communication. The PIS server sends the PIS service media stream to the network in a multicast mode, and the format of the PIS service message is as follows: multicast IP, UDP header, PIS Data, as well as L1 and L2 fields.
The core network filters and detects the multicast message aiming at the configured multicast IP address and receives the multicast message, and then encapsulates the integral PIS service message including the multicast IP, the UDP header and the PIS Data as payload Data into a GTP-U message. The GTP-U message is added with a GTP-U message header which comprises fields of GTP-U, UDP, IP and the like, and the IP is filled as 'media plane multicast IP from the core network to the eNB' carried in the group context establishing message. And the core network sends the encapsulated GTP-U message to all the eNBs in a multicast mode.
The method comprises the steps that an eNB acquires a multicast IP from a core network side when a group context is established in a PIS cluster group call, the acquired multicast IP is added into a multicast group of the eNB, the purpose that a multicast message sent by the core network is received is achieved, a GTP-U message in the received group broadcast message is processed, payload data is acquired after a GTP-U message header is removed, then the payload data is packaged according to a PDCP message of an air interface protocol, fields of PDCP, RLC, MAC and the like are added, and then the payload data is sent to a terminal through a group call shared channel TGTCH.
And the terminal receives the air interface message, completes the PDCP protocol layer processing according to the air interface protocol stack to obtain payload data, then submits the payload data to the application layer, and the application layer analyzes the payload message submitted by the PDCP protocol layer, and if the multicast IP contains the address of the terminal, the PIS service is played.
When a play controller exists in the system, the terminal forwards the PIS service message to the play controller, and the play controller submits the PIS Data to play software and then the play software performs play processing.
Fig. 7 is a schematic structural diagram of an embodiment of a subway PIS service multicast device based on LTE broadband trunking communication according to the present invention. The subway PIS service multicast device based on LTE broadband trunking communication provided by the embodiment of the application comprises: a PIS server 101, a cluster core network 102, an eNB103, and a terminal 104. The PIS server 101 is configured to send a PIS service packet to the cluster core network 102. The trunking core network 102 is configured to enhance the function of supporting trunking services on the basis of satisfying the standard LTE core network function, and is configured to configure PIS trunking groups, initiate group calling according to the calling range of each PIS trunking group, receive PIS service messages sent by PIS servers, encapsulate payload data into GTP-U messages, and multicast the GTP-U messages to the eNB 103. The eNB103 enhances the function of supporting the trunking service on the basis of satisfying the standard LTE base station function, receives the GTP-U packet, obtains payload data, encapsulates the payload data into a PDCP packet according to an air interface protocol, and sends the PDCP packet to the terminal 104. And the terminal 104 is configured to receive and analyze the PDCP packet, and complete the playing of the PIS service.
The cluster core network 102 configures a PIS cluster group for each PIS multicast service, and sets a unique multicast IP of each PIS cluster group, wherein members of the PIS cluster group include terminals 104 for receiving the PIS service, and the multicast IP includes addresses of the terminals 104 for receiving the PIS service. The cluster core network 102 initiates a group call according to the call range of each PIS cluster group. The PIS server 101 sends a PIS service message to the cluster core network 102 through the switch, wherein the PIS service message carries multicast IP information. The cluster core network 102 receives the PIS service packet sent by the PIS server, encapsulates payload data containing the PIS service packet and the multicast IP into a GTP-U packet, and multicasts the GTP-U packet to the eNB103 through the transmission network. The eNB103 receives and processes the GTP-U message, acquires payload data, encapsulates the payload data into a PDCP message according to an air interface protocol, and sends the PDCP message to the terminal 104; the terminal 104 receives the PDCP packet, processes the PDCP packet to obtain payload data, and delivers the payload data to the application layer, which analyzes the multicast IP in the payload data, and if the multicast IP contains the address of the terminal 104, plays the PIS service.
Fig. 8 is a schematic structural diagram of another embodiment of a subway PIS service multicast device based on LTE broadband trunking communication according to the present invention. The subway PIS service multicast device based on LTE broadband trunking communication provided by the embodiment of the application comprises: a PIS server 101, a cluster core network 102, an eNB103, and a terminal 104; further comprises a play controller 205: the play controller 205 is configured to receive the payload data forwarded by the terminal and complete the playing of the PIS service.
When playing the PIS service, the terminal 104 forwards the PIS service packet to the play controller 205, and the play controller 205 controls the play software to perform play processing.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (6)

1. A subway PIS service multicast method based on LTE broadband trunking communication is characterized by comprising the following steps:
the cluster core network configures a PIS cluster group for each PIS multicast service, and sets a unique multicast IP (Internet protocol) of each PIS cluster group; the members of the PIS cluster group comprise terminals for receiving PIS services; the multicast IP comprises the address of a terminal for receiving the PIS service;
the terminal for receiving the PIS service is a TAU or a CPE;
configuring a calling range for each PIS cluster group, wherein the calling range is an eNB set;
the cluster core network initiates group calling according to the calling range of each PIS cluster group;
the PIS server sends a PIS service message to a cluster core network, wherein the PIS service message carries multicast IP information;
the cluster core network multicasts a GTP-U message to an eNB, wherein payload data of the GTP-U message comprises a PIS service message and a multicast IP;
the eNB receives the GTP-U message, acquires payload data, encapsulates the payload data into a PDCP message according to an air interface protocol, and sends the PDCP message to the terminal;
the terminal receives the PDCP message, payload data is obtained and submitted to an application layer, the application layer analyzes the multicast IP in the payload data, and if the multicast IP contains the address of the terminal, the PIS service is played.
2. The method of claim 1, wherein the data in the PIS service message is video data or audio data.
3. The method as claimed in claim 1, wherein when the cluster core network sets a unique multicast IP for each PIS cluster group, a unique port number is also set for each PIS cluster group, the PIS server also has port number information when sending the PIS service packet, and the cluster core network and the terminal analyze the port number information when receiving the PIS service packet.
4. The method as claimed in claim 1, wherein the cluster core network dynamically maintains the PIS cluster group call to ensure that the call is permanently online, including:
the PIS cluster group calling does not have a speaking right application release mechanism, and the cluster core network completely forwards the received PIS service message;
the cluster core network does not start the inactive idle timer of the common cluster group calling, and keeps the PIS cluster group calling when there is or there is no service flow;
if the eNB exits the call abnormally, the cluster core network actively reestablishes the connection with the eNB;
if the PIS group calling is abnormally released, the cluster core network initiatively reestablishes the whole calling.
5. A subway PIS service multicast device based on LTE broadband trunking communication is used for realizing the method of any claim 1 to 4, and is characterized by comprising the following steps: PIS server, cluster core network, eNB, terminal:
the PIS server is used for sending a PIS service message to the cluster core network;
the cluster core network is used for enhancing the function of supporting the cluster service on the basis of meeting the standard LTE core network function, configuring PIS cluster groups, initiating group calling according to the calling range of each PIS cluster group, receiving PIS service messages sent by a PIS server, packaging payload data into GTP-U messages and multicasting the GTP-U messages to an eNB;
the eNB enhances the function of supporting the cluster service on the basis of meeting the standard LTE base station function, receives the GTP-U message, acquires payload data, encapsulates the payload data into a PDCP message according to an air interface protocol and sends the PDCP message to the terminal;
and the terminal is used for receiving and analyzing the PDCP message and finishing PIS service playing.
6. The device of claim 5, further comprising a play controller configured to receive payload data forwarded by the terminal and complete playing of the PIS service.
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