CN111447571A - PIS service data transmission method and system of rail transit train-ground wireless communication system - Google Patents
PIS service data transmission method and system of rail transit train-ground wireless communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0205—Traffic management, e.g. flow control or congestion control at the air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
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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
- H04W4/08—User group management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
Abstract
The invention belongs to the technical field of wireless communication, and particularly relates to a data transmission method and a data transmission system for a PIS (packet data service) of a rail transit train-ground wireless communication system, aiming at solving the problem of low data transmission quality of the PIS in the prior art. The invention comprises the following steps: the base station receives cluster group calling information sent by a core network for the PIS service, if the cluster group calling information is a cluster group calling release request message, the cluster group calling bearer of all cells on the base station is released, and PIS data transmission is stopped; if the request message is established for the cluster group calling, caching and executing: the terminal releases the service bearer for transmitting the CBTC in the local cell, releases the cluster group calling bearer and stops PIS service data transmission; the terminal is accessed or switched in and has a service bearer for transmitting CBTC, a cluster group calling bearer is established in the current cell, and PIS service data transmission is carried out. The cluster service of the invention shares air interface resources, simultaneously avoids the interference to the edge signal of the cell when the adjacent cell sends the PIS data, improves the signal-to-noise ratio of the cell edge and optimizes the transmission performance of the PIS service data.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a PIS service data transmission method and system of a rail transit train-ground wireless communication system.
Background
With the rapid development of government affairs, traffic, energy, public safety and other industries and the increasing popularization of intelligent terminals and internet application, wireless data services are rapidly increased, private network users have rapidly increased demands for Broadband wireless data services and multimedia Trunking services on the basis of traditional voice Trunking, and China is a private network wireless technology integrating multimedia Trunking application services such as voice, data and video and the like based on L TE (L ong terminal evolution) technology, and is further evolution of wireless private network Broadband technology.
Nowadays, the demands of users in the rail transit industry for wireless broadband data services and multimedia cluster comprehensive scheduling are increased explosively, and the broadband cluster market prospect is wide. In the rail transit industry, a train-ground wireless communication system with the functions of multi-service bearing, safety, stability, easy maintenance and interconnection is an urgent need for rapid, safe, intelligent and informatization development of rail transit at present, wherein three networks of train control Information, cluster scheduling and Passenger Information System (PIS) are integrated.
The passenger information system adopts a broadband trunking network technology and a multimedia transmission and display technology, and displays the designated information to the designated people at the designated time. During the running of the train, the vehicle-mounted equipment needs to receive the content from the ground operation center in real time and broadcast audio and video on a display screen of a train carriage. With the continuous development of science and technology, passenger service and consultation information not only needs to realize the communication between an operation center and a station, between the station and the station, but also needs to complete the real-time communication between a train and the ground. However, since the train is in a high-speed moving environment for real-time information transmission, in order to improve the quality of information service, the PIS service requires that the train can ensure the image quality without the phenomena of jamming, interruption and the like when running at a high speed, which requires that the train-ground wireless communication system has enough bandwidth for data transmission and ensures the quality of data transmission between trains and ground.
The data volume of the existing PIS service is generally 2Mbps or 4Mbps, and the data transmission is unidirectional transmission, and the direction is only from a ground base station to a vehicle-mounted terminal. In consideration of the special scene of multiple trains in a single cell, the transmission mode of a downlink shared channel in broadband trunking communication is adopted for PIS service transmission, that is, the PIS service adopts trunking group calling technology to transmit data at the base station side.
However, in the trunking group calling technology, when a call is established, a trunking group calling service is simultaneously established in all cells in the whole trunking dispatching area. When the vehicle-mounted terminal is located at the edge of a cell, due to the influence of the cluster service of the neighboring cell, the frequency of the cluster service of the cell is interfered, the sinr (signal to interference plus noise) at the edge of the cell is reduced, the transmission quality of an air interface is reduced, that is, when a train runs to the edge of the cell, the seizure of the PIS service occurs, even the service is interrupted.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, when the existing trunking group call technology is used to carry the PIS service, in the overlapping area between the cells, the adjacent cell interferes with the frequency of the cell, so that the data transmission quality of the PIS service is low, the invention provides a method for transmitting the PIS service data of a rail transit train-ground wireless communication system, which comprises the following steps:
step S10, the base station receives the cluster group call information sent by the core network for the PIS service, if the cluster group call establishes the request information, the cluster group call establishes the request information and jumps to step S20; if the request message is the release request message of the cluster group calling, releasing the cluster group calling load of all cells on the base station, and stopping PIS data transmission between the terminal and the base station;
step S20, acquiring the terminal state of the cell, and jumping to step S30 if the terminal release exists; if the terminal access exists, jumping to step S40; if the terminal cut-in exists, jumping to step S50;
step S30, if the terminal releases and the local cell has no CBTC transmission service bearer, releasing the cluster group call bearer of the PIS service in the local cell and stopping the PIS service data transmission between the terminal and the base station;
step S40, judging whether the accessed terminal has a load for transmitting CBTC, and establishing cluster group call load of PIS service in the current cell by combining the state and content of the cluster group call establishment request message, and transmitting PIS service data between the terminal and the base station;
step S50, determining whether the switched-in terminal has a bearer for transmitting CBTC, and establishing a cluster group call bearer of the PIS service in the current cell in combination with the state and content of the cluster group call establishment request message, and performing PIS service data transmission between the terminal and the base station.
In some preferred embodiments, step S40 includes:
step S41, if the accessed terminal has a load for transmitting CBTC, skipping to step S42; otherwise, ending the flow;
step S42, judging whether the base station has buffer and not established cluster group call establishment request message, if yes, jumping to step S43; otherwise, ending the flow;
step S43, the base station establishes air interface resources for the cluster group call service according to the content of the cached cluster group call establishment request message;
step S44, the base station sends the air interface resource allocation of the cluster Group calling service to the terminal through the Group Call Config message in the cluster control channel;
step S45, after receiving the Group Call Config message sent by the base station, the terminal starts receiving the PIS service data in the local cell.
In some preferred embodiments, step S50 includes:
step S51, if the switched-in terminal has a load for transmitting CBTC, skipping to step S52; otherwise, ending the flow;
step S52, judging whether the base station has buffer and not established cluster group call establishment request message, if yes, jumping to step S53; otherwise, ending the flow;
step S53, the base station establishes air interface resources for the cluster group call service according to the content of the cached cluster group call establishment request message;
step S54, the terminal completes the cell switch between the source cell and the local cell, and the base station transmits the air interface resource allocation of the cluster Group calling service to the local cell terminal through the Group Call Config message in the cluster control channel;
step S55, after receiving the Group Call Config message sent by the base station, the terminal starts receiving the PIS service data in the local cell.
In some preferred embodiments, in step S54, the step of the base station setting active cell release while issuing air interface resource configuration of the Group call service to the cell terminal through a Group call config message in the cluster control channel further includes:
step Y10, the source cell releases all the bearers of the terminal;
and step Y20, judging whether the source cell has the load for transmitting the CBTC service, if not, releasing the cluster group call load established for the PIS service by the source cell.
On the other hand, the invention provides a PIS service data transmission system of a rail transit vehicle-ground wireless communication system, which comprises a cluster information acquisition and judgment module, an information cache module, a first release module, a terminal state acquisition and judgment module, a second release module, a first data transmission module and a second data transmission module;
the cluster information acquisition and judgment module is configured to receive cluster group call information sent by a core network for PIS service, if the cluster group call information is a cluster group call establishment request message, the cluster group call establishment request message is cached through the information caching module, and the terminal state acquisition and judgment module is skipped; if the request message is the release request message of the cluster group calling, skipping to a first release module;
the information caching module is configured to cache the cluster group call establishment request message;
the first release module is configured to release the cluster group call bearers of all cells on the base station and stop PIS data transmission between the terminal and the base station;
the terminal state obtaining and judging module is configured to obtain the terminal state of the cell, and if the terminal release exists, the second releasing module is skipped; if the terminal access exists, skipping to the first data transmission module; if the terminal cut-in exists, skipping to the second data transmission module;
the second releasing module is configured to release the cluster group call bearer of the PIS service in the cell and stop PIS service data transmission between the terminal and the base station if the cell does not have a service bearer for transmitting CBTC after the terminal is released;
the first data transmission module is configured to judge whether the accessed terminal has a bearer for transmitting CBTC, and establish a cluster group call bearer of PIS service in the current cell by combining the state and the content of the cluster group call establishment request message, and perform PIS service data transmission between the terminal and the base station;
and the second data transmission module is configured to judge whether the switched-in terminal has a bearer for transmitting the CBTC, establish the cluster group call bearer of the PIS service in the current cell by combining the state and the content of the cluster group call establishment request message, and transmit the PIS service data between the terminal and the base station.
In some preferred embodiments, the first data transmission module includes a bearer state determination module, a cache information determination module, an air interface resource establishment module, and a first information issuing and data transmission module;
the load state judging module is configured to judge whether the accessed terminal has a load for transmitting the CBTC, and if the accessed terminal has the load for transmitting the CBTC, the load state judging module skips the cache information judging module; otherwise, ending;
the cache information judging module is configured to judge whether a base station has a cache and a cluster group call establishment request message which is not established yet, and if so, skip the air interface resource establishing module; otherwise, ending;
the air interface resource establishing module is configured to establish air interface resources for the cluster group call service according to the content of the cached cluster group call establishing request message;
the first information issuing and data transmission module is configured to issue the air interface resource configuration of the cluster Group Call service to the terminal through a Group Call Config message in the cluster control channel by the base station, and the terminal starts to receive the PIS service data in the cell after receiving the Group Call Config message.
In some preferred embodiments, the second data transmission module includes a bearer state determination module, a cache information determination module, an air interface resource establishment module, and a second information delivery and data transmission module;
the second information issuing and data transmission module is configured to complete cell switching between a source cell and the cell by the terminal, the base station issues air interface resource configuration of the trunking Group calling service to the cell terminal through a Group Call Config message in a trunking control channel, and the terminal starts to receive PIS service data in the cell after receiving the Group Call Config message.
In some preferred embodiments, the second data transmission module further includes a source cell release module;
and the source cell release module is configured to judge whether the source cell has a load for transmitting the CBTC service, and if not, the source cell releases the cluster group call load established for the PIS service.
In a third aspect of the present invention, a storage device is provided, in which a plurality of programs are stored, the programs being adapted to be loaded and executed by a processor to implement the above-mentioned PIS service data transmission method of a rail transit vehicle-ground wireless communication system.
In a fourth aspect of the present invention, a processing apparatus is provided, which includes a processor, a storage device; the processor is suitable for executing various programs; the storage device is suitable for storing a plurality of programs; the program is suitable for being loaded and executed by a processor to realize the PIS service data transmission method of the rail transit train-ground wireless communication system.
The invention has the beneficial effects that:
the invention relates to a PIS service data transmission method of a rail transit train-ground wireless communication system, which is characterized in that when the rail transit train-ground wireless system establishes cluster group call bearing for PIS service, the cluster group call bearing is immediately established in all cells of a wireless private network at the same time and the PIS service transmission is carried out, but the judgment is carried out: when a train passes through the local cell, a cluster group calling bearer is established at the cell gap to carry out PIS service transmission; and when the train drives away from the local cell, releasing the air interface resources occupied by the cluster group calling in the local cell, and stopping the transmission of the PIS service. The invention only sends the PIS data in the cell through which the train passes, and stops sending the PIS data in the cell away from which the train drives, thereby effectively utilizing the advantage that cluster services share air interface resources, avoiding the interference to the edge signal of the cell when the adjacent cell sends the PIS data, improving the signal-to-noise ratio of the cell edge and optimizing the transmission performance of the PIS service data.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a system block diagram of a PIS service data transmission method of a rail transit vehicle-ground wireless communication system of the present invention;
fig. 2 is a schematic flow chart of terminal access in the cell according to an embodiment of the method for transmitting PIS service data in the rail transit train-ground wireless communication system of the present invention;
fig. 3 is a schematic flow chart of terminal cut-in the cell according to an embodiment of the PIS service data transmission method of the rail transit train-ground wireless communication system of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention discloses a PIS service data transmission method of a rail transit train-ground wireless communication system, which comprises the following steps:
step S10, the base station receives the cluster group call information sent by the core network for the PIS service, if the cluster group call establishes the request information, the cluster group call establishes the request information and jumps to step S20; if the request message is the release request message of the cluster group calling, releasing the cluster group calling load of all cells on the base station, and stopping PIS data transmission between the terminal and the base station;
step S20, acquiring the terminal state of the cell, and jumping to step S30 if the terminal release exists; if the terminal access exists, jumping to step S40; if the terminal cut-in exists, jumping to step S50;
step S30, if the terminal releases and the local cell has no CBTC transmission service bearer, releasing the cluster group call bearer of the PIS service in the local cell and stopping the PIS service data transmission between the terminal and the base station;
step S40, judging whether the accessed terminal has a load for transmitting CBTC, and establishing cluster group call load of PIS service in the current cell by combining the state and content of the cluster group call establishment request message, and transmitting PIS service data between the terminal and the base station;
step S50, determining whether the switched-in terminal has a bearer for transmitting CBTC, and establishing a cluster group call bearer of the PIS service in the current cell in combination with the state and content of the cluster group call establishment request message, and performing PIS service data transmission between the terminal and the base station.
In order to more clearly describe the PIS service data transmission method of the rail transit vehicle-ground wireless communication system of the present invention, the following will describe each step in the embodiment of the method of the present invention in detail with reference to fig. 1.
The PIS service data transmission method of the rail transit vehicle-ground wireless communication system of the embodiment of the invention comprises the steps S10-S50, and the steps are described in detail as follows:
step S10, the base station receives the cluster group call information sent by the core network for the PIS service, if the cluster group call establishes the request information, the cluster group call establishes the request information and jumps to step S20; and if the request message is the trunking group calling release request message, releasing the trunking group calling bearers of all cells on the base station, and stopping PIS data transmission between the terminal and the base station.
When the base station receives a GROUP call release message GROUP CA LL CONTEXTRE L EASE sent by a core network for PIS service, the base station releases the GROUP call bearers of all cells on the base station and stops PIS data transmission between the terminal and the base station.
1 after receiving GROUP calling establishing REQUEST message GROUP CA LL CONTEXTSTETUP REQUEST sent by core network for PIS service, base station caches the message, replies GROUP CA LL CONTEXT SETUP RESPONSE to core network, and further judges.
Step S20, acquiring the terminal state of the cell, and jumping to step S30 if the terminal release exists; if the terminal access exists, jumping to step S40; if the terminal hand-in is present, the process goes to step S50.
Step S30, if the terminal releases and the cell has no CBTC service bearer, releasing the cluster group call bearer of the PIS service in the cell and stopping the PIS service data transmission between the terminal and the base station.
Step S40, determining whether the accessed terminal has a bearer for transmitting CBTC, and establishing a cluster group call bearer of the PIS service in the current cell in combination with the state and content of the cluster group call establishment request message, and performing PIS service data transmission between the terminal and the base station.
After receiving an access Request message RRC Connection Request sent by the terminal at the air interface, the base station performs access flow processing and further determines, as shown in fig. 2:
step S41, if the accessed terminal has a load for transmitting CBTC, skipping to step S42; otherwise, ending the flow;
step S42, judging whether the base station has buffer and not established cluster group call establishment request message, if yes, jumping to step S43; otherwise, ending the flow;
step S43, the base station establishes air interface resources for the cluster group call service according to the content of the cached cluster group call establishment request message;
step S44, the base station sends the air interface resource allocation of the cluster Group calling service to the terminal through the Group Call Config message in the cluster control channel;
step S45, after receiving the Group Call Config message sent by the base station, the terminal starts receiving the PIS service data in the local cell.
Step S50, determining whether the switched-in terminal has a bearer for transmitting CBTC, and establishing a cluster group call bearer of the PIS service in the current cell in combination with the state and content of the cluster group call establishment request message, and performing PIS service data transmission.
After receiving the handover request message, the base station performs handover flow processing and further determines, as shown in fig. 3:
step S51, if the switched-in terminal has a load for transmitting CBTC, skipping to step S52; otherwise, ending the flow;
step S52, judging whether the base station has buffer and not established cluster group call establishment request message, if yes, jumping to step S53; otherwise, ending the flow;
step S53, the base station establishes air interface resources for the cluster group call service according to the content of the cached cluster group call establishment request message;
step S54, the terminal completes the cell switch between the source cell and the local cell, and the base station transmits the air interface resource allocation of the cluster Group calling service to the local cell terminal through the Group Call Config message in the cluster control channel;
step S55, after receiving the Group Call Config message sent by the base station, the terminal starts receiving the PIS service data in the local cell.
After the terminal completes the switching between the source cell and the local cell, the base station issues the air interface resource configuration of the cluster Group Call service to the terminal of the local cell through the Group Call Config message in the cluster control channel, and sets the step of releasing the source cell, including:
step Y10, the source cell releases all the bearers of the terminal;
and step Y20, judging whether the source cell has the load for transmitting the CBTC service, if not, releasing the cluster group call load established for the PIS service by the source cell.
The system for transmitting the PIS service data of the rail transit vehicle-ground wireless communication system comprises a cluster information acquiring and judging module, an information caching module, a first releasing module, a terminal state acquiring and judging module, a second releasing module, a first data transmission module and a second data transmission module;
the cluster information acquisition and judgment module is configured to receive cluster group call information sent by a core network for PIS service, if the cluster group call information is a cluster group call establishment request message, the cluster group call establishment request message is cached through the information caching module, and the terminal state acquisition and judgment module is skipped; if the request message is the release request message of the cluster group calling, skipping to a first release module;
the information caching module is configured to cache the cluster group call establishment request message;
the first release module is configured to release the cluster group call bearers of all cells on the base station and stop PIS data transmission between the terminal and the base station;
the terminal state obtaining and judging module is configured to obtain the terminal state of the cell, and if the terminal release exists, the second releasing module is skipped; if the terminal access exists, skipping to the first data transmission module; if the terminal cut-in exists, skipping to the second data transmission module;
the second releasing module is configured to release the cluster group call bearer of the PIS service in the cell and stop PIS service data transmission between the terminal and the base station if the cell does not have a service bearer for transmitting CBTC after the terminal is released;
the first data transmission module is configured to judge whether the accessed terminal has a bearer for transmitting CBTC, and establish a cluster group call bearer of PIS service in the current cell by combining the state and the content of the cluster group call establishment request message, and perform PIS service data transmission between the terminal and the base station;
and the second data transmission module is configured to judge whether the switched-in terminal has a bearer for transmitting the CBTC, establish the cluster group call bearer of the PIS service in the current cell by combining the state and the content of the cluster group call establishment request message, and transmit the PIS service data between the terminal and the base station.
The first data transmission module comprises a bearing state judgment module, a cache information judgment module, an air interface resource establishment module and a first information issuing and data transmission module;
the load state judging module is configured to judge whether the accessed terminal has a load for transmitting the CBTC, and if the accessed terminal has the load for transmitting the CBTC, the load state judging module skips the cache information judging module; otherwise, ending;
the cache information judging module is configured to judge whether a base station has a cache and a cluster group call establishment request message which is not established yet, and if so, skip the air interface resource establishing module; otherwise, ending;
the air interface resource establishing module is configured to establish air interface resources for the cluster group call service according to the content of the cached cluster group call establishing request message;
the first information issuing and data transmission module is configured to issue the air interface resource configuration of the cluster Group Call service to the terminal through a Group Call Config message in the cluster control channel by the base station, and the terminal starts to receive the PIS service data in the cell after receiving the Group Call Config message.
The second data transmission module comprises a bearing state judgment module, a cache information judgment module, an air interface resource establishment module and a second information issuing and data transmission module;
the second information issuing and data transmission module is configured to complete cell switching between a source cell and the cell by the terminal, the base station issues air interface resource configuration of the trunking Group calling service to the cell terminal through a Group Call Config message in a trunking control channel, and the terminal starts to receive PIS service data in the cell after receiving the Group Call Config message.
The second data transmission module further comprises a source cell release module;
and the source cell release module is configured to judge whether the source cell has a load for transmitting the CBTC service, and if not, the source cell releases the cluster group call load established for the PIS service.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and related description of the system described above may refer to the corresponding process in the foregoing method embodiments, and will not be described herein again.
It should be noted that, the PIS service data transmission system of the rail transit vehicle-ground wireless communication system provided in the foregoing embodiment is only illustrated by dividing the functional modules, and in practical applications, the above functions may be allocated to different functional modules according to needs, that is, the modules or steps in the embodiments of the present invention are further decomposed or combined, for example, the modules in the foregoing embodiment may be combined into one module, or may be further split into a plurality of sub-modules, so as to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the modules or steps, and are not to be construed as unduly limiting the present invention.
A storage device of a third embodiment of the present invention stores a plurality of programs, which are suitable for being loaded and executed by a processor to implement the above-mentioned PIS service data transmission method of a rail transit vehicle-ground wireless communication system.
A processing apparatus according to a fourth embodiment of the present invention includes a processor, a storage device; a processor adapted to execute various programs; a storage device adapted to store a plurality of programs; the program is suitable for being loaded and executed by a processor to realize the PIS service data transmission method of the rail transit train-ground wireless communication system.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes and related descriptions of the storage device and the processing device described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Those of skill in the art would appreciate that the various illustrative modules, method steps, and modules described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that programs corresponding to the software modules, method steps may be located in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. To clearly illustrate this interchangeability of electronic hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing or implying a particular order or sequence.
The terms "comprises," "comprising," or any other similar term 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.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A PIS service data transmission method of a rail transit train-ground wireless communication system is characterized by comprising the following steps:
step S10, the base station receives the cluster group call information sent by the core network for the PIS service, if the cluster group call establishes the request information, the cluster group call establishes the request information and jumps to step S20; if the request message is the release request message of the cluster group calling, releasing the cluster group calling load of all cells on the base station, and stopping PIS data transmission between the terminal and the base station;
step S20, acquiring the terminal state of the cell, and jumping to step S30 if the terminal release exists; if the terminal access exists, jumping to step S40; if the terminal cut-in exists, jumping to step S50;
step S30, if the terminal releases and the local cell has no CBTC transmission service bearer, releasing the cluster group call bearer of the PIS service in the local cell and stopping the PIS service data transmission between the terminal and the base station;
step S40, judging whether the accessed terminal has a load for transmitting CBTC, and establishing cluster group call load of PIS service in the current cell by combining the state and content of the cluster group call establishment request message, and transmitting PIS service data between the terminal and the base station;
step S50, determining whether the switched-in terminal has a bearer for transmitting CBTC, and establishing a cluster group call bearer of the PIS service in the current cell in combination with the state and content of the cluster group call establishment request message, and performing PIS service data transmission between the terminal and the base station.
2. The method for transmitting the PIS service data of the rail transit vehicle-ground wireless communication system according to claim 1, wherein the step S40 includes:
step S41, if the accessed terminal has a load for transmitting CBTC, skipping to step S42; otherwise, ending the flow;
step S42, judging whether the base station has buffer and not established cluster group call establishment request message, if yes, jumping to step S43; otherwise, ending the flow;
step S43, the base station establishes air interface resources for the cluster group call service according to the content of the cached cluster group call establishment request message;
step S44, the base station sends the air interface resource allocation of the cluster Group calling service to the terminal through the Group Call Config message in the cluster control channel;
step S45, after receiving the Group CallConfig message sent by the base station, the terminal starts receiving the PIS service data in the local cell.
3. The method for transmitting the PIS service data of the rail transit vehicle-ground wireless communication system according to claim 1, wherein the step S50 includes:
step S51, if the switched-in terminal has a load for transmitting CBTC, skipping to step S52; otherwise, ending the flow;
step S52, judging whether the base station has buffer and not established cluster group call establishment request message, if yes, jumping to step S53; otherwise, ending the flow;
step S53, the base station establishes air interface resources for the cluster group call service according to the content of the cached cluster group call establishment request message;
step S54, the terminal completes the cell switch between the source cell and the local cell, and the base station transmits the air interface resource allocation of the cluster Group calling service to the local cell terminal through the Group CallConfig message in the cluster control channel;
step S55, after receiving the Group CallConfig message sent by the base station, the terminal starts receiving the PIS service data in the local cell.
4. The method for transmitting the PIS service data of the rail transit vehicle-ground wireless communication system according to claim 3, wherein in step S54, the step of setting the active cell release while the base station issues the air interface resource configuration of the trunking Group Call service to the cell terminal through the Group Call Config message in the trunking control channel further comprises:
step Y10, the source cell releases all the bearers of the terminal;
and step Y20, judging whether the source cell has the load for transmitting the CBTC service, if not, releasing the cluster group call load established for the PIS service by the source cell.
5. A PIS service data transmission system of a rail transit train-ground wireless communication system is characterized by comprising a cluster information acquisition and judgment module, an information cache module, a first release module, a terminal state acquisition and judgment module, a second release module, a first data transmission module and a second data transmission module;
the cluster information acquisition and judgment module is configured to receive cluster group call information sent by a core network for PIS service, if the cluster group call information is a cluster group call establishment request message, the cluster group call establishment request message is cached through the information caching module, and the terminal state acquisition and judgment module is skipped; if the request message is the release request message of the cluster group calling, skipping to a first release module;
the information caching module is configured to cache the cluster group call establishment request message;
the first release module is configured to release the cluster group call bearers of all cells on the base station and stop PIS data transmission between the terminal and the base station;
the terminal state obtaining and judging module is configured to obtain the terminal state of the cell, and if the terminal release exists, the second releasing module is skipped; if the terminal access exists, skipping to the first data transmission module; if the terminal cut-in exists, skipping to the second data transmission module;
the second releasing module is configured to release the cluster group call bearer of the PIS service in the cell and stop PIS service data transmission between the terminal and the base station if the cell does not have a service bearer for transmitting CBTC after the terminal is released;
the first data transmission module is configured to judge whether the accessed terminal has a bearer for transmitting CBTC, and establish a cluster group call bearer of PIS service in the current cell by combining the state and the content of the cluster group call establishment request message, and perform PIS service data transmission between the terminal and the base station;
and the second data transmission module is configured to judge whether the switched-in terminal has a bearer for transmitting the CBTC, establish the cluster group call bearer of the PIS service in the current cell by combining the state and the content of the cluster group call establishment request message, and transmit the PIS service data between the terminal and the base station.
6. The PIS service data transmission system of the rail transit vehicle-ground wireless communication system of claim 5, wherein the first data transmission module comprises a bearing state judgment module, a cache information judgment module, an air interface resource establishment module, a first information issuing and data transmission module;
the load state judging module is configured to judge whether the accessed terminal has a load for transmitting the CBTC, and if the accessed terminal has the load for transmitting the CBTC, the load state judging module skips the cache information judging module; otherwise, ending;
the cache information judging module is configured to judge whether a base station has a cache and a cluster group call establishment request message which is not established yet, and if so, skip the air interface resource establishing module; otherwise, ending;
the air interface resource establishing module is configured to establish air interface resources for the cluster group call service according to the content of the cached cluster group call establishing request message;
the first information issuing and data transmission module is configured to issue the air interface resource configuration of the cluster Group call service to the terminal through a Group Call Config message in the cluster control channel by the base station, and the terminal starts to receive the PIS service data in the cell after receiving the Group Call Config message.
7. The PIS service data transmission system of the rail transit vehicle-ground wireless communication system according to claim 6, wherein the second data transmission module comprises a bearing state judgment module, a cache information judgment module, an air interface resource establishment module, and a second information issuing and data transmission module;
the second information issuing and data transmission module is configured to complete cell switching between the source cell and the local cell for the terminal, the base station issues the air interface resource configuration of the trunking Group Call service to the terminal of the local cell through a Group Call configuration message on the trunking control channel, and the terminal starts to receive the PIS service data in the local cell after receiving the Group Call configuration message.
8. The PIS service data transmission system of the rail transit vehicle-to-ground wireless communication system of claim 6, wherein the second data transmission module further comprises a source cell release module;
and the source cell release module is configured to judge whether the source cell has a load for transmitting the CBTC service, and if not, the source cell releases the cluster group call load established for the PIS service.
9. A storage device having stored therein a plurality of programs, wherein the programs are adapted to be loaded and executed by a processor to implement the PIS service data transmission method of a rail transit vehicle-to-ground wireless communication system of any of claims 1-4.
10. A processing apparatus comprising a processor adapted to execute programs; and a storage device adapted to store a plurality of programs; characterized in that the program is adapted to be loaded and executed by a processor to implement the PIS service data transmission method of a rail transit vehicle-to-ground wireless communication system of any of claims 1-4.
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