CN100403849C - Group cal communication system and its method - Google Patents
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Abstract
The present invention relates to mobile communication technology, particularly to a group calling communication system and a method thereof. The present invention makes group calling service in a mobile communication network have high reliability. In the present invention, at least two layers of networks are overlapped and covered in the same group calling region, and a group calling control center resides in each layer of network; terminals or a fixed dispatching desk which starts group calling determines an anchor group calling control center and establishes, controls and manages the group calling, and other group calling control centers are relay group calling control centers; the terminals can reside in the same layer of network, and the networks which are overlapped and covered work in a main-spare mode; the terminals can reside in different layers of networks, and the networks which are overlapped and covered work in a load-sharing mode. When the layers of networks work in the main-spare mode, if the terminals in a main network and spare networks simultaneously start the group calling, the group calling control center in the main network is triggered to be the anchor group calling control center, and the group calling control centers in the spare networks refuse the group calling and receive relay requests.
Description
Technical Field
The present invention relates to mobile communication technology, and in particular, to a group call communication system and method thereof.
Background
Since the birth of the 80 s analog mobile communication system, mobile communication has been rapidly developed in the world in as short as twenty years, and the influence of mobile communication on human life and work has been increasing with the successive introduction of the first to third generation mobile communication systems.
The biggest difference between Mobile Communication and fixed-line telephone Communication is that a user is in a Mobile state, which means that the coverage of a Mobile Communication network needs to satisfy the mobility of the user, so that, taking a Global System for Mobile Communication (GSM) as an example, the coverage of the GSM network is expanded from a large city to a small and medium city, and from a city center business and a user dense area to a suburb, and the national automatic roaming of GSM is realized while the problem of national coverage of the network is solved.
The GSM system consists of three main subsystems connected to each other and connected to the user through a certain network interface. The three subsystems are a Base Station Subsystem (BSS), a Network and Switching Subsystem (NSS) and an Operation Support Subsystem (OSS). A Mobile Station (MS) subsystem is typically considered part of the BSS. The mobile station is a device that is practical for users in the GSM mobile communication network, and the types of the mobile station mainly include a vehicle-mounted station and a handheld station (mobile phone).
In the GSM system, the BSS is responsible for providing and managing the transmission path between the NSS and the MS, including in particular the management of the radio interface between the MS and the functional entities of the GSM system. The NSS is responsible for the management of communication services, ensuring that the MS establishes communication with the associated public communication network or with other MSs. That is, the NSS does not directly interwork with the MS, nor does the BSS directly interwork with the public communication network. The MS, BSS and NSS form the entity part of the GSM system. The OSS provides the operator with control, maintenance and management of these actual parts of the operation.
The BSS is composed of two functional entities, a Base Transceiver Station (BTS) and a Base Station Controller (BSC). The BTS is responsible for wireless transmission, and the BSC is responsible for control and management.
The BTS is a base transceiver station and is also an important component of the BSS. It is controlled by BSC to complete the conversion between BSC and radio channel and realize the radio transmission of air interface between BTS and MS and relevant control function. The BTS mainly comprises a baseband unit, a carrier frequency unit, a control unit, an antenna feeder unit and the like. The baseband unit is mainly used for necessary voice and data rate adaptation, channel coding and the like; the carrier frequency unit is mainly used for modulation/demodulation, radio frequency signal sending and receiving and the like; the control unit is used for operation and maintenance of the BTS. The antenna feed unit is mainly used for branching/combining radio frequency signals and converting the radio frequency signals into electromagnetic waves or converting the electromagnetic waves into the radio frequency signals.
The BSC is the control part of the BSS, and manages various interfaces, and takes charge of the management of radio resources and radio transmission parameters. The BSC mainly consists of the following parts: management, control and processing parts of the related interfaces; a common processing section; and an exchange part.
The BSS is composed of one BSC and one or more BTSs, and one BSC can control tens of BTSs according to traffic demands. The BTS may be directly connected to the BSC, or may be connected to the BSC through a Base Interface Equipment (BIE) in a remote control connection manner.
At the heart of the GSM network is a Mobile Switching Center (MSC) which controls all BSC services, provides Switching functions and connections to other functions within the system, and provides interface functions with the fixed network, interconnecting Mobile subscribers with Mobile subscribers, Mobile subscribers and fixed network subscribers. The MSC obtains all data required for the Location registration and call request of the subscriber from three databases in the system, namely, a Home Location Register (HLR), a Visitor Location Register (VLR), and an Authentication Center (AUC). In addition, the MSC also requests partial data of the database to be updated according to its newly acquired information. The MSC also supports mobility features such as location registration, handover, automatic roaming, and other network functions as the core of the network.
With the increasing perfection of GSM and the functions of the private network or the public network trunking system based on the GSM technical system, more and more humanized functions come along, such as the Voice over IP (VoIP) technology supporting the network group call
The VoIP technology is a technology of converting a voice signal into a digitized voice packet of a certain length, and performing switching and transmission in the form of a packet by using a store-and-forward method.
Networks using VoIP technology may support network group calls, which refers to calls initiated by a calling subscriber or administrator to some or all of the subscribers in a group. The method for initiating the call comprises that the message initiated by the calling party carries the address or number information of all called users; or the calling request message initiated by the calling party only carries the network group identification, and the network side initiates the calling to each called party according to the user information in the group corresponding to the network group identification. The network group identifier is used for calling, so that the communication traffic of data transmitted to the group control center by the user equipment when the call is initiated can be effectively reduced, the address or number information of each called user does not need to be sent any more, the effect is more obvious when the group is larger, and great convenience is brought to the user.
Group call functions are used in many systems, such as global system for mobile communications (GSM for railways, abbreviated as "GSM-R"). The GSM-R is a system facility directly designed, constructed and used for railway transportation production and railway informatization service, and mainly completes functions of railway dispatching communication, station and yard communication, emergency communication, section communication, official communication, transportation information transmission and the like. The voice service in train dispatching adopts the functions of addressing, location-based addressing, group calling, broadcast calling, emergency calling and the like of a GSM-R system, can provide railway transportation command voice communication service, and realizes point-to-point calling, point-to-point emergency calling, broadcast calling, group calling, railway emergency calling and multiparty calling.
However, since GSM systems were originally intended to serve public communications and were not primarily concerned with security applications, non-security-related communication systems have a much lower reliability requirement than security-related communication systems. For example, the GSM-R can carry train control information, and as the control information is used for controlling or monitoring the train, once a problem occurs in the system, the system may cause a train to miss a shift and a train point, and may cause a safety problem.
Therefore, how to meet the requirement of high reliability of group calling for safety-related applications becomes an urgent problem to be solved for a private network or a common network cluster system based on the GSM technical system.
At present, a private network or a common network trunking system based on a GSM technical system generally uses single network coverage, that is, only one layer of network coverage is provided in the same area. On the basis, the GSM-based cluster private network and the cluster common network adopt a single anchor MSC, a single scheduling platform and a single-layer network coverage to provide a group calling service implementation scheme. The single-Network covered group calling communication system based on GSM technical system includes a GSM Network, said GSM Network has its fixed Mobile Network number (MNC), also includes a MSC, a dispatching desk and a BSC, said BSC can control one or several BTS.
The reliability of the group calling based on the GSM system is purely dependent on the software and hardware quality of equipment and a wireless transmission environment, when the coverage of the MSC, the dispatching desk and the single-layer network fails, the cluster group calling service is interrupted, wherein the MSC is a call control center of the whole group calling, and when the MSC fails, the whole group calling cannot be carried out at all. In order to ensure the reliability of the group calling in the GSM system, the hardware or software development of single-network coverage equipment or products adopts strict related reliability, quality and safety control flow and design method of safety product development, and very strict requirements on reliability and safety indexes of the equipment of the products are put forward, and especially extremely high requirements on the reliability and safety of the software and hardware of the MSC are provided. It is hoped to ensure the reliability and safety of the group call of the GSM system by improving the reliability of the single network coverage equipment.
In practical applications, the above scheme has the following problems: the reliability of the group call service in the mobile communication network cannot be guaranteed.
The main reason for this is that the development flow and product design method of the hardware or software of the GSM single-network overlay device or product are significantly different from the development flow and product design method of the common public communication device manufacturer, it is difficult for the common public communication equipment manufacturers to implement, and it becomes difficult to improve the reliability of the equipment after reaching a certain performance, and the cost is multiplied, so the rigorous requirements of reliability and safety index on equipment of the product can not be met, the software and hardware of the device for the MSC or single layer network always have a certain failure probability, when the MSC, the dispatching desk and the single-layer network coverage fail, the cluster group calling service is interrupted, especially, the MSC is the call control center of the whole group calling, when the MSC fails, the whole group call cannot be performed at all, and the security and reliability of the group call service cannot be ensured.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a group call communication system and method thereof, so that the group call service in the mobile communication network has high reliability.
To achieve the above object, the present invention provides a group call communication system, comprising:
at least two mobile communication networks, overlapping and covering the same group calling area;
the group calling terminals reside in one of the networks respectively, and reside in other networks when the resident network fails;
each network comprises a group calling control center, wherein when a terminal or a dispatching desk initiates a group calling, the group calling control center which the terminal or the dispatching desk belongs to is triggered to be an anchor group calling control center for establishing and controlling and managing the group calling, and other group calling control centers are triggered to be relay group calling control centers of the anchor group calling control center for performing group calling establishment in the jurisdiction range under the control of the anchor group calling control center.
The system also comprises at least two fixed dispatching stations which are respectively connected with different group calling control centers, wherein one fixed dispatching station is a main fixed dispatching station, and the other fixed dispatching stations are standby fixed dispatching stations; when the terminal initiates a group call, the main fixed dispatching station preferentially joins the group call, if the main fixed dispatching station fails, the standby fixed dispatching station joins the group call.
In addition, in the system, the terminal preferentially resides in the same network, the network is a primary network, and other networks are standby networks of the network.
In addition, in the system, when the terminals respectively residing in the networks simultaneously initiate group calling, the group calling control center in the main network is triggered to be an anchor group calling control center, and the group calling control center in the standby network rejects the group calling in the network due to the busy group calling to become a relay group calling control center.
In addition, in the system, in the configuration information of the network side, the active network is configured to initiate a group call by using an immediate assignment channel mode, and the standby network is configured to initiate a group call by using a delayed assignment channel mode.
In addition, in the system, the terminal preferentially resides in different networks, and the networks share the load with each other.
Further in the system, the mobile communication network includes a global system for mobile communication network, a code division multiple access network (e.g., a wideband code division multiple access network, a time division synchronous code division multiple access network, a code division multiple access 2000 network, etc.), a personal hand-held telephone system network, a wireless local area network, a worldwide interoperability for microwave access network, and a trunked communication network.
In addition, in the system, the mobile communication network is a private network or a public network based on a global system for mobile communications technology, and the group call control center is a mobile switching center.
Further in the system, the scheduling stations include a fixed scheduling station and a mobile scheduling station.
In addition, in the system, each of the networks includes an independent base station on the network side; or,
the networks share the same base station on the network side.
The invention also provides a group call communication method, which comprises the following steps:
each group calling terminal selects one from each overlapped mobile communication network to reside;
when the current resident network of the terminal fails, the terminal resides in other networks;
when the terminal initiates group calling, the terminal or the dispatching desk initiates group calling, the group calling control center which the terminal belongs to triggers is an anchor group calling control center, the group calling is established and controlled and managed, other group calling control centers trigger a relay group calling control center of the anchor group calling control center, and the group calling establishment in the subordinate scope is carried out under the control of the anchor group calling control center.
The comparison shows that the technical scheme of the invention is mainly different from the prior art in that at least two layers of networks are overlapped and covered in the same group call area, and a group call control center resides in each layer of network. The terminal or fixed dispatching desk which initiates the group calling decides the anchor group calling control center, establishes and controls and manages the group calling, and the rest group calling control centers are relay group calling control centers.
The terminal can reside in the same layer network, and each overlapping coverage network works in a master-standby mode; the terminal can also reside in different layer networks, and each overlapping coverage network works in a load sharing mode.
When each layer network works in a master-slave mode, if terminals in the master network and the standby network initiate group calling at the same time, the group calling control center in the master network is triggered to be an anchor group calling control center, and the group calling control center in the standby network rejects the group calling and receives a relay request. In addition, the active network can be configured as an immediate channel assignment mode, and the standby network can be configured as a delayed channel assignment mode.
When the network fails, the terminal in the failure area selects other non-failure networks to reside.
The fixed dispatching stations are respectively accessed in different layer networks, so that the fixed dispatching stations work in a master-standby mode, and when a group call is initiated by a terminal in the network, a master fixed dispatching station is preferentially accessed to the group call; when the main fixed dispatching desk is in fault or the group calling control center connected with the main fixed dispatching desk is in fault, the standby fixed dispatching desk replaces the main fixed dispatching desk to work.
Each layer of network can use independent base stations or share the same base station.
The difference in the technical scheme brings obvious beneficial effects that when a layer of network covering a group calling area or a group calling control center thereof fails, a terminal in the failure area can reside in other non-failure networks, and the group calling control center in the other non-failure networks is responsible for establishing and controlling and managing a group calling when initiating the group calling, thereby ensuring that the terminal in the group calling area can normally realize a group calling function, and solving the problem that the reliability of a group calling service in a mobile communication network only depends on the software and hardware quality of product equipment and a wireless transmission environment. The backup of the multi-layer network and the plurality of group call control centers greatly improves the reliability of the group call service, for example, the group call service availability of the terminal in the group call area covered by the single-layer network is 99.99%, and then the group call service availability of the terminal in the group call area repeatedly covered by the double-layer network and residing in the group call control center in each layer network is 99.9999%, so that the group call service requiring high reliability such as railway emergency call, fire emergency call, public security armed police emergency action, emergency linkage emergency group call and the like is satisfied.
All terminals reside in the same layer network, so that each overlapped network layer works in a main-standby mode, the assignment mode of the main network where the terminals reside is set to be assigned immediately, and the assignment modes of other standby networks are set to be assigned in a delayed mode, so that the reliability of the group calling service is improved, the extra requirements on frequency resources are not increased, and the requirement of building a high-reliability trunking communication network in a limited frequency band resource is met.
The fixed dispatching station further improves the stability and reliability of the group calling service by the mechanism that the fixed dispatching station works in a master-standby mode.
Different networks share the same base station, so that the reliability is improved, and the cost of the system network is properly saved.
Drawings
Fig. 1 is a schematic diagram of a group call communication system according to the present invention;
fig. 2 is a schematic diagram of a group call communication system according to a first embodiment of the present invention;
fig. 3 is a flowchart of a method of group call communication according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of using a primary fixed scheduling station when a terminal in a primary network initiates a group call in a group call communication system according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of using a standby fixed dispatching station when a terminal in a main network initiates a group call in a group call communication system according to a first embodiment of the present invention;
fig. 6 is a schematic diagram of using a primary fixed dispatching station when a terminal in a standby network initiates a group call in a group call communication system according to a first embodiment of the present invention;
fig. 7 is a schematic diagram of using a standby fixed dispatching station when a terminal in a standby network initiates a group call in the steps of the group call communication system according to the first embodiment of the present invention;
fig. 8 is a schematic diagram of a group call control center failure in the group call communication system according to the first embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The core of the invention is that the group calling communication system comprises at least two mobile communication networks which are overlapped to cover the same group calling area, a plurality of group calling terminals reside in one of the networks respectively and reside in other networks when the resident network fails, each network comprises a group calling control center respectively, when a terminal or a dispatching desk initiates group calling, the group calling control center which the terminal or the dispatching desk belongs to is triggered to be an anchor group calling control center for establishing and controlling and managing the group calling, and other group calling control centers are triggered to be a relay group calling control center of the anchor group calling control center for establishing group calling in the subordinate range under the control of the anchor group calling control center.
Specifically, as shown in fig. 1, the group call communication system of the present invention is covered by two layers of networks, where the coverage positions and sizes of the two layers of networks may be different, and the two layers of networks overlap and cover the same group call area. Each Group calling area requiring high reliability Group calling is covered by two network layers, namely a network covering layer 1 and a network covering layer 2, each Group calling network covering layer comprises a plurality of cells, and each Group calling network covering layer is provided with a fixed dispatching station, an MSC, a Visitor Location Register (VLR), a Group Calling Register (GCR) and a BSS which are independent from each other. The MSC is a group call control center of the group call communication system, and GCR stores all cell lists in two network coverage layers of the group call area. In general, two covering layers of a group call system work in a master-slave or load sharing manner, a plurality of group call terminals reside on a group call network covering layer 1 or a group call network covering layer 2 respectively, when a terminal or a dispatching desk in the group call network covering layer 1 initiates a group call, a group call control center MSC1 to which the terminal belongs is triggered to be an anchor group call control center for establishing and controlling and managing the group call, and an MSC2 is triggered to be a relay group call control center of the anchor group call control center for performing group call establishment in the subordinate scope under the control of the anchor group call control center. When the group calling network overlay layer 1 fails, all group calling terminals in the failure area reside in the group calling network overlay layer 2. Similarly, when a terminal or a dispatching desk in a fault area initiates a group call on the group call network overlay layer 2, the group call control center MSC2 to which the terminal or the dispatching desk belongs is triggered to be an anchor group call control center to establish and control and manage the group call, the MSC1 is triggered to be a relay group call control center of the MSC2, and the group call establishment in the jurisdiction range is carried out under the control of the MSC 1.
In order to better express the present invention, a group call communication system according to a first embodiment of the present invention will be described below according to the principle of the present invention.
As shown in fig. 2, the group call communication system in this embodiment includes two mobile communication networks, which overlap and cover the same group call area. A plurality of group calling terminals preferentially reside in the same mobile communication network, the network is a main network, and the other network is a standby network of the network. In the configuration information of the network side, the main network is configured to initiate a group call by using an immediate assignment channel mode, and the standby network is configured to initiate a group call by using a delayed assignment channel mode. The main network and the standby network respectively comprise a group call control center and a BSS. The primary network comprises a group call control center 1 and a BSS1, and the standby network comprises a group call control center 2 and a BSS 2. The corresponding GCR of each group calling control center stores the list of the cells under the jurisdiction of the group calling control center in the group calling area, and the group calling control center 1 stores the group calling control center 2 as the relay group calling control center, and the group calling control center 2 stores the group calling control center 1 as the relay group calling control center. In addition, the group call communication system also includes two fixed dispatching stations, each fixed dispatching station is connected with different group call control center, one of them is the main fixed dispatching station, and is connected with group call control center 1, the other is the standby fixed dispatching station, and is connected with group call control center 2. In general, a primary dispatching station is used, when a primary fixed dispatching station fails, a standby dispatching station can work in place of the primary dispatching station, and the stability and reliability of the group call service are further improved through a mechanism that the fixed dispatching station works in a primary-standby mode.
Before a terminal or a dispatching desk initiates a group call, a main network is set as a home network in each terminal, a standby network is set as a visit network, and each group call terminal preferentially resides in the main network and resides in the standby network when the main network fails. When a terminal or a dispatching desk initiates a group call, a group call control center in a network to which the terminal or the dispatching desk belongs is triggered to be an anchor group call control center, and a group call control center in another network is triggered to be a relay group call control center of the anchor group call control center. The anchor group calling control center establishes and controls and manages the group calling according to the channel assignment mode stored in the corresponding GCR, and the relay group calling control center establishes the group calling in the subordinate range under the control of the anchor group calling control center according to the channel assignment mode stored in the corresponding GCR. The anchor group calling control center calls the main fixed dispatching station to join the group calling preferentially, if the main fixed dispatching station is in failure, the anchor group calling control center calls the standby fixed dispatching station to join the group calling. When terminals residing in different layer networks initiate group calling at the same time, the group calling control center in the main network is triggered to be the anchor group calling control center, the group calling control center in the standby network refuses the group calling in the network due to the busy group calling, and the group calling control center becomes the relay group calling control center.
The system of the present embodiment has been described above, and the method of the present embodiment will be described in detail below.
As shown in fig. 3, in step 310, each group call terminal preferentially camps on the active network according to the preset configuration. Specifically, before starting group calling, the main network may be set as a home network and the standby network may be set as a visited network in each group calling terminal, so that each group calling terminal can preferentially camp on its home network, that is, the main network, according to the setting. In order to avoid that the group calling traffic system increases additional requirements on frequency resources while improving the reliability of the group calling service, the main network is configured to initiate the group calling by using an immediate assignment channel mode and the standby network is configured to initiate the group calling by using a delayed assignment channel mode in the configuration information of the network side in advance, so that the limited frequency resources are saved.
In step 320, the network side determines whether the main network where each group call terminal resides currently has a fault, if the main network has no fault, step 330 is entered, and if the main network has a fault, step 340 is entered.
In step 330, when the terminal or the dispatcher station initiates a group call, the group call control center 1 is triggered as an anchor group call control center, and the group call control center 2 is triggered as a relay group call control center. Specifically, when a terminal or a dispatcher station initiates a group call, a group call control center in a network to which the terminal or the dispatcher station belongs is triggered to be an anchor group call control center, another group call control center is triggered to be a relay group call control center of the anchor group call control center, namely, a group call control center 1 in a main network is triggered to be the anchor group call control center, and a group call control center 2 in a standby network is triggered to be the relay group call control center. The anchor group calling control center, namely group calling control center 1, according to the channel assignment mode stored in the corresponding GCR1, uses the immediate assignment channel mode to establish and control and manage the group calling; the relay group calling control center, i.e. the group calling control center 2, uses the delay assignment channel mode to establish the group calling in the subordinate scope under the control of the anchor group calling control center according to the channel assignment mode stored in the corresponding GCR 2. The anchor group call control center calls the main fixed dispatching station to preferentially join the group call, as shown in fig. 4. If the primary fixed dispatching station fails, the anchor group calling control center calls the standby fixed dispatching station to join the group calling through the relay group calling control center, as shown in fig. 5.
In step 340, each group calling terminal in the failure area resides in the standby network. That is, each group call terminal in the active network failure area resides in its visited network, i.e. the standby network, according to the previous settings. Step 350 is then entered.
In step 350, when each mobile terminal or dispatch station in the standby network initiates a group call, it is determined whether there is a terminal in the main network initiating a group call at the same time. Specifically, when each mobile terminal or dispatch station in the standby network initiates a group call, there may be terminals in the main network that initiate a group call at the same time, and both parties trigger their group call control centers to an anchor group call control center at the same time and send a relay group call control center processing request message to the other party group call control center. If the group call control center 2 in the standby network receives the relay group call control center processing request message, it indicates that there is a terminal in the main network to initiate group call at the same time, and step 360 is entered, if the relay group call control center processing request message is not received, step 370 is entered.
In step 360, the group call control center 2 in the standby network rejects the group call. Specifically, in step 350, the group call control center 2 receives the relay group call control center processing request message from the group call control center 1, which indicates that there are terminals in the primary network to initiate group calls at the same time, and at this time, the group call control center 1 is used to preferentially serve as an anchor group call control center for processing, the group call control center 2 rejects the group call due to the group busy, and receives the group call relay request from the anchor group call control center as the relay group call control center for the group call, and performs group call establishment within the jurisdiction under the control of the anchor group call control center.
If it is determined in step 350 that there is no terminal in the primary network and initiates a group call, step 370 is entered, the state that the group call control center 2 in step 350 is the anchor group call control center is maintained, and the group call control center 1 in the primary network is triggered as the relay group call control center. The anchor group calling control center, namely group calling control center 2, according to the channel assignment mode stored in the corresponding GCR2, uses the delay assignment channel mode to establish and control and manage the group calling; the relay group calling control center, i.e. the group calling control center 1, uses the immediate channel assignment mode to establish the group calling in the subordinate scope under the control of the anchor group calling control center according to the channel assignment mode stored in the corresponding GCR 1. The anchor group call control center calls the main fixed dispatching station to preferentially join the group call, as shown in fig. 6. If the primary fixed dispatching station fails, the anchor group calling control center calls the standby fixed dispatching station to join the group calling, as shown in fig. 7.
It should be noted that, as shown in fig. 8, if the group call control center 1 in the primary network fails, that is, the entire primary overlay network fails, in step 320, all the mobile terminals reside in the standby network, and when each mobile terminal or dispatch station in the standby network initiates a group call, the anchor group call control center, that is, the group call control center 2, calls the standby fixed dispatch station to join the group call, and simultaneously independently establishes and controls and manages the group call. When one layer of network covering a group calling area or a group calling control center thereof fails, the terminal in the failure area resides in other non-failure networks, and the group calling control center in other non-failure networks is responsible for establishing and controlling and managing the group calling when initiating the group calling, thereby ensuring that the terminal in the group calling area can normally realize the group calling function, and solving the problem that the reliability of the group calling service in a mobile communication network only depends on the quality of software and hardware of product equipment and the wireless transmission environment.
In addition, it should be noted that the mobile communication Network in this embodiment is a private Network or a public Network based on the global System for mobile communications technology, and includes a GSM Network, a Code Division Multiple Access (CDMA) Network, a Wideband Code Division Multiple Access (WCDMA) Network, a Time Division synchronous Code Division Multiple Access (TD-SCDMA) Network, a Code Division Multiple Access 2000 (CDMA 2000) Network, a Personal Handyphone System (PHS) Network, a Wireless Local Area Network (WLAN), a Worldwide Interoperability for Microwave Access (WiMAX) Network, and a trunking communication Network.
In this embodiment, the group call control center may be an MSC or other devices, and if the group call control center is on the BSC side, it may be a BSC. The scheduling station in this embodiment includes a fixed scheduling station and a mobile scheduling station.
The second embodiment of the present invention is substantially the same as the first embodiment, and the difference is that two layers of networks in the group call communication system of the first embodiment are in a master-slave relationship, each group call terminal preferentially resides in the master network, and the master network and the standby network operate in a master-slave manner. In the group call communication system of the embodiment, two layers of networks are not primary and secondary, each group call terminal preferentially resides in different networks, and the two layers of networks share the load with each other. The two-layer network may be configured to initiate a group call using an immediate assignment channel mode, or may be configured to initiate a group call using a delayed assignment channel mode.
The third embodiment of the present invention is substantially the same as the first embodiment, and is different only in that the two-layer network in the group call communication system of the first embodiment includes an independent base station on the network side. In the group call communication system of the embodiment, the two layers of networks share the same base station at the network side, and the two layers of networks can be simulated by using different frequency points and the like. Different networks share the same base station, so that the reliability is improved, and the cost of the system network is properly saved.
In each of the above embodiments, a two-layer network is used, which is a practical way, but more layers of networks may be used in the present invention. One of the layers may be set as the active network, the other may be set as the standby network, or the load may be shared in each layer of network. In general, each cell in each layer of network has a peer-to-peer cell with substantially the same physical coverage in other layer networks, but it is also possible to use a method in which the cells in each layer of network do not correspond.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (11)
1. A group call communication system, comprising:
at least two mobile communication networks, overlapping and covering the same group calling area;
the group calling terminals reside in one of the networks respectively, and reside in other networks when the resident network fails;
each network comprises a group calling control center, wherein when a terminal or a dispatching desk initiates a group calling, the group calling control center which the terminal or the dispatching desk belongs to is triggered to be an anchor group calling control center for establishing and controlling and managing the group calling, and other group calling control centers are triggered to be relay group calling control centers of the anchor group calling control center for performing group calling establishment in the jurisdiction range under the control of the anchor group calling control center.
2. The group call communication system according to claim 1, wherein said system further comprises at least two fixed dispatching stations, each connected to a different group call control center, wherein one fixed dispatching station is a primary fixed dispatching station, and the other fixed dispatching stations are backup fixed dispatching stations; when the terminal initiates a group call, the main fixed dispatching station preferentially joins the group call, if the main fixed dispatching station fails, the standby fixed dispatching station joins the group call.
3. The group call communication system according to claim 1, wherein said terminals reside preferentially in a same network, the network being a primary network and the other networks being backup networks for the network.
4. The group call communication system according to claim 3, wherein when said terminals respectively residing in said networks initiate group call simultaneously, said group call control center in said primary network triggers to become an anchor group call control center, and said group call control center in said backup network rejects group call in said network to become a relay group call control center due to busy group call.
5. The group call communication system according to claim 3, wherein in the configuration information of the network side, the active network is configured to initiate the group call using an immediate assignment channel mode, and the standby network is configured to initiate the group call using a delayed assignment channel mode.
6. The group call communication system according to claim 1, wherein said terminals preferentially reside in different networks, and the networks share load with each other.
7. The group call communication system according to any of claims 1 to 6, wherein the mobile communication network comprises a global system for mobile communication network, a code division multiple access network, a personal hand-held telephone system network, a wireless local area network, a worldwide interoperability for microwave access network, and a trunked communication network;
the code division multiple access network includes: wideband code division multiple access networks, time division synchronous code division multiple access networks, and code division multiple access 2000 networks.
8. The group call communication system according to claim 7, wherein the mobile communication network is a private network or a public network based on the global system for mobile communications technology, and the group call control center is a mobile switching center.
9. The group call communication system according to any of claims 1 to 6, wherein said dispatching stations comprise fixed dispatching stations and mobile dispatching stations.
10. The group call communication system according to any of claims 1 to 6, wherein each of said networks comprises an independent base station on a network side; or,
the networks share the same base station on the network side.
11. A method of group call communication, comprising the steps of:
each group calling terminal selects one from each overlapped mobile communication network to reside;
when the current resident network of the terminal fails, the terminal resides in other networks;
when the terminal initiates group calling, the terminal or the dispatching desk initiates group calling, the group calling control center which the terminal belongs to triggers is an anchor group calling control center, the group calling is established and controlled and managed, other group calling control centers trigger a relay group calling control center of the anchor group calling control center, and the group calling establishment in the subordinate scope is carried out under the control of the anchor group calling control center.
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