CN102215458A - Digital cluster communication system based on long term evolution technology as well as base station and terminal - Google Patents

Abstract

The present invention provides a digital trunking communication system based on Long Term Evolution (LTE) technology, a base station and a trunking user terminal, by adding a new trunking signaling wireless bearer in the digital trunking communication system based on LTE technology, such as T-SRB0, which is used to send trunk group call setup messages and can be sent repeatedly periodically, and T-SRB1, which is used to send trunk group call release messages, realizes trunking users in the digital trunking communication system based on LTE technology Late access of terminals.

Description

Digital Trunking Communication System, Base Station and Terminal Based on Long Term Evolution Technology

technical field

The present invention relates to mobile communication technology, in particular to a digital trunking communication system based on long-term evolution technology, a base station and a trunking user terminal.

Background technique

Due to its unique characteristics of dispatching, group calling and fast calling, the digital trunking communication system has played a huge role in the field of professional communication. Since the mid-1990s, the digital trunking communication system has emerged worldwide and has been widely accepted. application, and achieved good economic and social benefits. Existing digital trunking communication systems mainly include: Terrestrial Trunked Radio (TETRA, Terrestrial Trunked Radio) system, Integrated Digital Enhanced Networks (iDEN, Integrated Digital Enhanced Networks) system, Open Trunking Architecture (GoTa, Global Open Trunking Architecture) system and GT800 system etc.

The trunking service is the most basic service provided by the digital trunking communication system, which allows a trunking user terminal to establish a group call to a certain group of trunking user terminals belonging to a given area. For a digital trunking communication system, the call setup time (the time from initiating a call to being able to speak) is an important performance index, and this time mainly depends on the complexity of the signaling interaction between the trunking user terminal and the network side, each network element The transmission delay between devices and the way network element devices process signaling, etc. Since the existing digital trunking communication system is mostly based on Global System for Mobile Communications (GSM, Global System for Mobile Communications) or Code Division Multiple Access (CDMA, Code Division Multiple Access) technology, the base station needs to be controlled by the base station controller, which cannot communicate with the core The network directly communicates, so there are more signaling interactions during the trunking service establishment process, which in turn leads to a longer call establishment time. In addition, in the existing digital trunking communication system, trunking services are all carried in the circuit domain, so the sharing of service channels cannot be realized, resulting in a decrease in resource utilization.

For this reason, a digital trunking communication system based on Long Term Evolution (LTE, Long Term Evolution) technology is proposed in the prior art, and a trunking service is realized based on the system. Since the traditional LTE technology is designed for point-to-point communication services, and the trunking service is a point-to-multipoint service, it is necessary to modify the air interface channel of the traditional LTE technology, adding new logical channels and new transmission channel etc. After adopting the above-mentioned digital trunking communication system based on LTE technology, the trunking service will be carried in the packet domain, so the sharing of service channels can be fully realized, thereby greatly improving resource utilization, thereby reducing the operating cost of the digital trunking communication system; in addition, LTE The technology adopts an all-IP flat network architecture, and the base station is directly connected to the core network. Therefore, the internal signaling interaction on the network side during the call establishment process is reduced, and the call establishment time is shortened.

However, the above-mentioned digital trunking communication system based on LTE technology also has certain problems: an important feature of the traditional digital trunking communication system is that it will consider the late access of the trunking user terminal. The so-called late access refers to the During the establishment of trunking services, since there are many trunking user terminals being called, it is difficult to ensure that all trunking user terminals can be accessed at one time for each call. For the connected cluster user terminal, the system can call again after a period of time, that is, delay the access time, and repeat the process until the cluster service is released, so as to ensure that each cluster user terminal can access the cluster service in time However, the existing digital trunking communication system based on LTE technology cannot realize the delayed access of trunking user terminals.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a digital trunking communication system based on long-term evolution technology, which can realize delayed access of trunking user terminals.

Another object of the present invention is to provide a base station capable of realizing delayed access of trunking user terminals in a digital trunking communication system based on long term evolution technology.

Another object of the present invention is to provide a trunking user terminal, which can realize delayed access of the trunking user terminal in the digital trunking communication system based on the long-term evolution technology.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A digital trunking communication system based on Long Term Evolution LTE technology, which pre-defines trunking signaling radio bearers T-SRB0 and T-SRB1 for the trunking control channel TCCH in the digital trunking communication system based on LTE technology; the T-SRB0 The signaling message carried on the T-SRB1 is transmitted on a different TCCH logical channel, and the logical channel number is used to identify the LCID to distinguish it; the system includes:

The base station is configured to send a trunking group paging message on the trunking paging control channel TPCCH, which carries a group identifier and a temporary wireless network identifier G-RNTI, and sends it on T-SRB0 of the TCCH channel after a predetermined period of time Trunk group call setup message; save the sent trunk group paging message and trunk group call setup message, and periodically repeat sending the trunk group paging message after a predetermined late access delay message and the trunk group call setup message; determine whether the trunk group call release message is received on the T-SRB1, if yes, release the trunk group paging message and the trunk group call setup message sent periodically, And send a cluster group call release message on T-SRB1;

The trunking user terminal is configured to receive the trunking group paging message, obtain the group identifier and the G-RNTI carried therein, and determine whether it belongs to the group identifier, if not, end the processing, and if it does, further Determine whether the G-RNTI is received for the first time, if it is received for the first time, then establish the cluster control plane channel corresponding to the G-RNTI, and then perform subsequent processing, if it is not received for the first time, directly perform subsequent processing; The G-RNRI receives the signaling message carried on the TCCH channel, and uses the LCID to determine whether the signaling message is a trunk group call setup message sent on T-SRB0 or a trunk group message sent on T-SRB1 Call release message, if it is a cluster group call setup message, then further determine whether the cluster group call setup message is received for the first time, if it is received for the first time, configure and establish the cluster call service plane entity, if it is not the first time If it is received, it will not be processed. If it is a trunk group call release message, the group call resource will be released.

A base station, which is applied in a digital trunking communication system based on Long Term Evolution technology, and defines trunking signaling radio bearers T-SRB0 and T-SRB0 in advance for the trunking control channel TCCH in the digital trunking communication system based on LTE technology. SRB1; the signaling messages carried on the T-SRB0 and T-SRB1 are transmitted on different TCCH logical channels, and the logical channel number is used to identify the LCID to distinguish; the base station includes:

The first sending unit is configured to send a trunking group paging message on the trunking paging control channel TPCCH, which carries a group identifier and a temporary radio network identifier G-RNTI. Send a trunk group call setup message on SRB0; save the sent trunk group paging message and trunk group call setup message, and periodically repeat the trunk group call setup message after a predetermined late access delay Group paging messages and cluster group call setup messages;

The second sending unit is used to determine whether the trunk group call release message is received on the T-SRB1, and if so, notify the first sending unit of the trunk group paging message and the trunk group paging message that will be sent periodically The call setup message is released, and a trunk group call release message is sent on T-SRB1.

A trunking user terminal, the trunking user terminal is applied in a digital trunking communication system based on the long-term evolution LTE technology, and a trunking signaling radio bearer T is defined in advance for the trunking control channel TCCH in the digital trunking communication system based on the LTE technology -SRB0 and T-SRB1; the signaling messages carried on the T-SRB0 and T-SRB1 are transmitted on different TCCH logical channels, and are distinguished by logical channel number identification LCID; the cluster user terminal includes:

The first processing unit is configured to receive the trunking group paging message sent by the base station on the trunking paging control channel TPCCH, obtain the group identifier and the wireless network temporary identifier G-RNTI carried in it, and determine whether the trunking user terminal belongs to the group The group identifier, if it does not belong, then end the processing, if it belongs, then further determine whether the G-RNTI is received for the first time, if it is received for the first time, then establish the cluster control plane channel corresponding to the G-RNTI, and then Informing the second processing unit to perform its own function, if it is not received for the first time, directly informing the second processing unit to perform its own function;

The second processing unit is configured to use the G-RNRI to receive the signaling message carried on the TCCH channel, and use the LCID to determine that the signaling message is a trunk group call setup sent on T-SRB0 The message is still a trunk group call release message sent on T-SRB1. If it is a trunk group call setup message, it is further determined whether the trunk group call setup message is received for the first time, and if it is received for the first time, trunking The configuration and establishment of the call service plane entity, if it is not received for the first time, it will not be processed, if it is a trunk group call release message, the group call resource will be released.

It can be seen that, by adopting the technical solution of the present invention, by adding a new trunking signaling radio bearer in the digital trunking communication system based on LTE technology, such as the T-SRB used to send the trunking group call setup message, which can be sent repeatedly periodically. And the T-SRB1 used for sending the trunking group call release message realizes the late access of the trunking user terminal in the digital trunking communication system based on the LTE technology.

Description of drawings

FIG. 1 is a schematic diagram of a downlink mapping relationship in an existing digital trunking communication system based on LTE technology.

FIG. 2 is a schematic diagram of the composition and structure of the digital trunking communication system based on the LTE technology of the present invention.

FIG. 3 is a schematic diagram of the composition and structure of the base station embodiment of the present invention.

FIG. 4 is a schematic diagram of the composition and structure of an embodiment of a cluster user terminal according to the present invention.

Detailed ways

According to the previous introduction, in the prior art, by modifying the air interface channel of the LTE technology and adding new logical channels and new transmission channels, the trunking service can already be realized in the digital trunking communication system based on the LTE technology.

The above modifications are mainly reflected in: the air interface protocol of LTE technology stipulates that the data transmission service on the logical channel is provided by the media access control layer (MAC, Media Access Control1), and different types of data transmission services need to correspond to different logical channel types. Therefore, in view of the point-to-multipoint characteristics of trunking services, a new trunking paging control channel (TPCCH, Trunking Paging Control Channel) for carrying trunking group paging control information, for carrying trunking group call establishment, group call Trunking Control Channel (TCCH, Trunking Control Channel) for control information such as release and right of speech notification, and Trunking Traffic Channel (TTCH, Trunking Traffic Channel) for transmitting trunking point-to-multipoint service data. In addition, the transport channel is the service access point (SAP, ServiceAccess Point) between the physical layer and the MAC sublayer, which is mainly used to transmit the information transmission service provided by the physical layer to the MAC sublayer or higher layers. According to the characteristics of the TPCCH channel, A new transmission channel for carrying the TPCCH channel, that is, a trunking paging transmission channel (TPCH, Trunking Paging Channel).

FIG. 1 is a schematic diagram of a downlink mapping relationship in an existing digital trunking communication system based on LTE technology. As shown in Figure 1, the mapping path of the TPCCH channel is: TPCCH channel-TPCH channel-physical downlink shared channel (PDSCH, Physical Downlink Shared Channel); the mapping path of the TTCH channel is: TTCH channel-downlink shared channel (DL-SCH, Downlink sharedchannel)-PDSCH channel; the mapping way of TCCH channel is: TCCH channel-DL-SCH channel and PDSCH channel.

In order to realize the solution of the present invention, on the basis of the above, three trunking signaling radio bearers T-SRB0, T-SRB1 and T-SRB2 are further defined for the TCCH channel. Among them, T-SRB0 is used for signaling transmission of the trunk group call setup message, T-SRB1 is used for signaling transmission of the trunk group call release message, and T-SRB2 is used for signaling of control information such as right to speak notification. command transmission. The signaling messages of T-SRB0, T-SRB1 and T-SRB2 are transmitted on different TCCH logical channels, and are distinguished by logical channel ID (LCID, Logic Channel ID). Among them, T-SRB0 and T-SRB1 are directly related to the solution of the present invention. To realize the late access of the trunking user terminal, it is necessary to ensure that the trunking group call setup message carried on T-SRB0 can be repeated periodically Send, and release the trunk group call setup message carried on T-SRB0 when the trunk group call release message is carried on T-SRB1.

Based on the above introduction, FIG. 2 is a schematic diagram of the composition and structure of the digital trunking communication system based on the LTE technology of the present invention. As shown in Figure 2, it includes: a base station 21 and a cluster user terminal 22; the number of cluster user terminals 22 is usually multiple, and in this embodiment, only one is shown for simplifying the drawings, and the processing of each cluster user terminal 22 The methods are the same. in,

The base station 21 is used to send a trunk group paging message on the TPCCH, which carries a group identifier and a wireless network temporary identifier (G-RNTI, GERAN Radio Network Temporary Identifier). Send trunk group call setup message; save the sent trunk group paging message and trunk group call setup message, and periodically repeat sending the trunk group Paging messages and trunk group call setup messages; and determine whether a trunk group call release message is received on T-SRB1, and if so, release the trunk group paging messages and trunk group call setup messages sent periodically , and send a trunk group call release message on T-SRB1;

The trunking user terminal 22 is configured to receive the trunking group paging message, obtain the group identifier and the G-RNTI carried therein, and determine whether it belongs to the group identifier, if not, end the processing, and if it does, further Determine whether the G-RNTI is received for the first time, if it is received for the first time, establish the cluster control plane channel corresponding to the G-RNTI, and then perform subsequent processing, if it is not received for the first time, directly perform subsequent processing; use the G-RNTI - RNRI receives the signaling message carried on the TCCH channel, and uses the LCID to determine whether the signaling message is a trunk group call setup message sent on T-SRB0 or a trunk group call release message sent on T-SRB1, if If it is a trunk group call setup message, it is further determined whether the trunk group call setup message is received for the first time, if it is received for the first time, the configuration and establishment of the trunk call service plane entity is performed, and if it is not received for the first time, then no Processing, if it is a group call release message, release group call resources.

Specifically, the processing flow of the base station 21 mainly includes:

1) A trunk group paging message is sent on the TPCCH channel, and the trunk group paging message carries information such as a group identifier and a G-RNTI.

The base station 21 will notify each cluster user terminal 22 of the sending opportunity and the sending cycle of the TPCCH channel in advance through a broadcast message. The sending opportunity refers to the sending position information of the TPCCH channel, that is, which subframe of the radio frame the TPCCH channel is carried on For sending, the subframe is usually a P0 subframe, and subsequently, when the trunk group paging message needs to be sent on the TPCCH channel, the base station 21 will send it at the above-mentioned designated position.

The role of the group identifier and the G-RNTI will be introduced later.

2) After sending out the trunk group paging message, the base station 21 sends a trunk group call setup message on T-SRB0 of the TCCH channel after a predetermined period of time, that is, after a period of delay.

3) If in steps 1) and 2), the trunking group paging message and the trunking group call setup message are sent for the first time, then the base station 21 will save these two pieces of information, and then after a predetermined delay, the access delay Afterwards, periodically repeat steps 1) and 2), that is, periodically repeat sending the trunk group paging message and the trunk group call setup message until the trunk group call release is received on the T-SRB1 of the TCCH channel. news. Therefore, the base station 21 needs to determine in real time whether the trunk group call release message is received on T-SRB1, and if so, release the trunk group paging message and the trunk group call setup message sent periodically, and send the message on T-SRB1 Send trunk group call release message.

The delays involved in the above steps are preset; in addition, how does the base station 21 determine which trunking user terminals 22 to send the trunking group paging message, trunking group call establishment message and trunking group call release message etc. are prior art and will not be introduced; moreover, how to receive the trunk group call release message on T-SRB1 is also prior art, for example, it can be received from the core network, and the specific implementation will not be introduced.

Based on the above-mentioned processing flow of the base station 21, the processing flow of the cluster user terminal 22 mainly includes:

1) After the trunking user terminal 22 receives the trunking group paging message sent by the base station 21 on the TPCCH channel, it obtains the group identifier and the G-RNTI carried therein, and determines whether it belongs to the group identifier. How to determine it is a prior art, If it does not belong, the process ends, and if it does, step 2) is performed.

Based on the previous introduction, it can be seen that the base station 21 will notify the cluster user terminal 22 of the transmission opportunity and the transmission cycle of the TPCCH channel in advance through a broadcast message. Therefore, the cluster user terminal 22 can periodically detect the TRCCH channel at the notified position to obtain Cluster group paging message.

If the trunking user terminal 22 determines that it does not belong to the group identifier carried in the trunking group paging message, it means that this trunking service has nothing to do with itself, so no further processing is required.

2) The cluster user terminal 22 determines whether the G-RNTI carried in the cluster group paging message is received for the first time (because the base station 21 will periodically repeat sending), if it is received for the first time, then establishes the G-RNTI corresponding to the G-RNTI The trunking control plane channel, that is, the related entities and contexts required to generate the three trunking signaling radio bearers of the TCCH channel, including the packet data convergence protocol (PDCP, Packet Data Convergence Protocol) entity, radio link control (RLC, Radio Link Control ) entity, MAC entity, and physical layer entity, etc., and then perform step 3); if it is not received for the first time, it means that the cluster control plane channel corresponding to the G-RNTI has been established before, so step 3) can be directly performed.

How to establish the cluster control plane channel corresponding to the G-RNTI is an existing technology and will not be introduced.

3) The trunking user terminal 22 uses the G-RNTI to receive the signaling message carried on the TCCH channel, and uses the LCID to determine whether the signaling message is a trunk group call setup message sent on T-SRB0 or sent on T-SRB1 Trunk group call release message, of course, may also be messages such as the right to speak notification sent on T-SRB2, because this situation has no direct relationship with the scheme of the present invention, so it will not be introduced; if the trunk group call is set up message, then perform step 4), if it is a trunk group call release message, then perform step 5).

4) The trunking user terminal 22 determines whether the trunking group call setup message is received for the first time (because the base station 21 will periodically repeat sending), if it is received for the first time, the configuration and establishment of the trunking call service plane entity are performed, that is Establish a TTCH channel to receive trunking service data. If it is not received for the first time, it means that the configuration and establishment of the trunking call service plane entity have been completed before, so there is no need to perform repeated processing, and the message can be discarded.

How to configure and establish the trunking call service plane entity is also an existing technology.

5) If the trunking group call release message is received in step 3), then the trunking user terminal 22 will release the group call resource, that is, release the previously established trunking control plane channel and trunking call service plane entity.

The specific structures of the base station 21 and the trunking user terminal 22 shown in FIG. 2 are shown in FIGS. 3 and 4 respectively.

FIG. 3 is a schematic diagram of the composition and structure of the base station embodiment of the present invention. As shown in Figure 3, including:

The first sending unit 31 is configured to send a trunk group paging message on the TPCCH channel, which carries a group identifier and a G-RNTI, and sends a trunk group call setup message on T-SRB0 of the TCCH channel after a predetermined period of time ; Save the sent trunk group paging message and trunk group call setup message, and periodically repeat sending the trunk group paging message and trunk group call after a predetermined late access delay build message;

The second sending unit 32 is used to determine whether the trunk group call release message is received on the T-SRB1, and if so, notify the first sending unit 31 to periodically send the trunk group paging message and the trunk group call setup The message is released, and a trunk group call release message is sent on T-SRB1.

In addition, the base station shown in FIG. 3 may further include: a broadcast unit 33, configured to notify the cluster user terminal of the TPCCH channel sending opportunity and sending cycle through a broadcast message, the sending opportunity being the sending location information of the TPCCH channel.

FIG. 4 is a schematic diagram of the composition and structure of an embodiment of a cluster user terminal according to the present invention. As shown in Figure 4, including:

The first processing unit 41 is configured to receive the cluster group paging message sent by the base station on the TPCCH channel, obtain the group identifier and the G-RNTI carried therein, and determine whether the cluster user terminal belongs to the group identifier, if not , then end the process, if it is, then further determine whether the G-RNTI is received for the first time, if it is the first time received, then establish the cluster control plane channel corresponding to the G-RNTI, and then notify the second processing unit 42 to execute own function, if it is not received for the first time, directly notify the second processing unit 42 to execute its own function;

The second processing unit 42 is configured to use the G-RNRI to receive the signaling message carried on the TCCH channel, and use the LCID to determine whether the signaling message is a trunk group call setup message sent on the T-SRB0 or on the T-SRB0 If the trunk group call release message sent on SRB1 is a trunk group call setup message, it is further determined whether the trunk group call setup message is received for the first time, and if it is received for the first time, then the trunk group call service plane entity Configuration and establishment, if it is not received for the first time, it will not be processed, if it is a group call release message, the group call resource release will be performed.

In addition, the cluster user terminal shown in Figure 4 may further include:

The receiving unit 43 is configured to receive the broadcast message from the base station, and obtain the sending opportunity and sending period information of the TPCCH channel carried therein, where the sending opportunity is the sending location information of the TPCCH channel.

Please refer to the corresponding description in the system embodiment shown in FIG. 2 for the specific working process of the embodiment of the base station and the cluster user terminal shown in FIGS. 3 and 4 , and will not be repeated here.

In a word, by adopting the technical scheme of the present invention, it is possible to realize delayed access of trunking user terminals in a digital trunking communication system based on LTE technology.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (9)

1. A digital trunking communication system based on Long Term Evolution (LTE) technology is characterized in that trunking signaling radio bearers (T-SRB 0 and T-SRB 1) are defined in advance for a Trunking Control Channel (TCCH) in the digital trunking communication system based on LTE technology; the signaling messages carried on the T-SRB0 and the T-SRB1 are transmitted on different TCCH logical channels and are distinguished by using logical channel number identifiers (LCID); the system comprises:

the base station is used for sending a cluster paging message on a cluster paging control channel TPCCH, wherein the cluster paging message carries a group identifier and a radio network temporary identifier G-RNTI, and after a preset time length, sending a cluster group call establishment message on a T-SRB0 of the TCCH channel; storing the transmitted paging message of the cluster group and the call establishment message of the cluster group, and periodically and repeatedly transmitting the paging message of the cluster group and the call establishment message of the cluster group after a preset delay time for access; determining whether a trunking group call release message is received on the T-SRB1, if yes, releasing a trunking group paging message and a trunking group call setup message which are periodically sent, and sending a trunking group call release message on the T-SRB 1;

the cluster user terminal is used for receiving the cluster paging message, acquiring the group identifier and the G-RNTI carried in the cluster paging message, determining whether the cluster user terminal belongs to the group identifier, if not, finishing the processing, if so, further determining whether the G-RNTI is received for the first time, if so, establishing a cluster control plane channel corresponding to the G-RNTI, and then carrying out subsequent processing, and if not, directly carrying out the subsequent processing; and the G-RNRI is used for receiving the signaling message carried on the TCCH, and the LCID is used for determining whether the signaling message is a trunking group call establishment message sent on T-SRB0 or a trunking group call release message sent on T-SRB1, if the signaling message is the trunking group call establishment message, whether the trunking group call establishment message is received for the first time is further determined, if the trunking group call establishment message is received for the first time, the configuration and establishment of a trunking call service plane entity are carried out, if the trunking group call release message is not received for the first time, the processing is not carried out, and if the signaling message is the trunking group call release message, the group call resource release is carried out.

2. The system of claim 1, wherein the base station comprises:

a first sending unit, configured to send a cluster group paging message on the TPCCH channel, where the cluster group paging message carries a group identifier and a G-RNTI, and send a cluster group call setup message on the T-SRB0 of the TCCH channel after a predetermined time period; storing the transmitted paging message of the cluster group and the call establishment message of the cluster group, and periodically and repeatedly transmitting the paging message of the cluster group and the call establishment message of the cluster group after a preset delay time for access;

a second sending unit, configured to determine whether a trunking group call release message is received on the T-SRB1, if so, notify the first sending unit to release the periodically sent trunking group paging message and trunking group call setup message, and send a trunking group call release message on the T-SRB 1.

3. The system of claim 2, wherein the base station further comprises:

and the broadcasting unit is used for informing the sending opportunity and the sending period of the TPCCH to the trunking user terminal through a broadcast message, wherein the sending opportunity is the sending position information of the TPCCH.

4. A system according to claim 1, 2 or 3, wherein the group of user terminals comprises:

a first processing unit, configured to receive the cluster group paging message, obtain a group identifier and a G-RNTI carried in the group paging message, determine whether the group identifier and the G-RNTI belong to the group identifier, if the group identifier and the G-RNTI do not belong to the group identifier, end the processing, if the group identifier and the G-RNTI belong to the group identifier are received for the first time, further determine whether the G-RNTI is received for the first time, if the G-RNTI is received for the first time, establish a cluster control plane channel corresponding to the G-RNTI, and then notify a second processing unit to execute a self function, if the G-RNTI is not received for the first time, directly notify the second;

the second processing unit is configured to receive the signaling message carried on the TCCH channel by using the G-RNRI, determine whether the signaling message is a trunking group call setup message sent on T-SRB0 or a trunking group call release message sent on T-SRB1 by using the LCID, further determine whether the trunking group call setup message is received for the first time if the signaling message is the trunking group call setup message, configure and establish a trunking call service plane entity if the signaling message is received for the first time, perform no processing if the signaling message is not received for the first time, and perform group call resource release if the signaling message is the trunking group call release message.

5. The system of claim 4, wherein the clustered user terminals further comprise:

and the receiving unit is used for receiving the broadcast message from the base station and acquiring the sending opportunity and sending cycle information of the TPCCH carried in the broadcast message, wherein the sending opportunity is the sending position information of the TPCCH.

6. A base station is characterized in that the base station is applied to a digital trunking communication system based on a Long Term Evolution (LTE) technology, and trunking signaling radio bearers T-SRB0 and T-SRB1 are defined in advance for a Trunking Control Channel (TCCH) in the digital trunking communication system based on the LTE technology; the signaling messages carried on the T-SRB0 and the T-SRB1 are transmitted on different TCCH logical channels and are distinguished by using logical channel number identifiers (LCID); the base station includes:

a first sending unit, configured to send a trunking paging message on a trunking paging control channel TPCCH, where the trunking paging message carries a group identifier and a radio network temporary identifier G-RNTI, and after a predetermined time duration, send a trunking call setup message on a T-SRB0 of the TCCH channel; storing the transmitted paging message of the cluster group and the call establishment message of the cluster group, and periodically and repeatedly transmitting the paging message of the cluster group and the call establishment message of the cluster group after a preset delay time for access;

a second sending unit, configured to determine whether a trunking group call release message is received on the T-SRB1, if so, notify the first sending unit to release the periodically sent trunking group paging message and trunking group call setup message, and send a trunking group call release message on the T-SRB 1.

7. The base station of claim 6, further comprising:

and the broadcasting unit is used for informing the sending opportunity and the sending period of the TPCCH to the trunking user terminal through a broadcast message, wherein the sending opportunity is the sending position information of the TPCCH.

8. A trunking user terminal is applied to a digital trunking communication system based on Long Term Evolution (LTE) technology, and a trunking signaling radio bearer (T-SRB 0) and a trunking signaling radio bearer (T-SRB 1) are defined in advance for a Trunking Control Channel (TCCH) in the digital trunking communication system based on LTE technology; the signaling messages carried on the T-SRB0 and the T-SRB1 are transmitted on different TCCH logical channels and are distinguished by using logical channel number identifiers (LCID); the cluster user terminal includes:

the first processing unit is used for receiving a trunking group paging message sent by a base station on a trunking paging control channel TPCCH, acquiring a group identifier and a radio network temporary identifier G-RNTI carried in the trunking group paging message, determining whether a trunking user terminal belongs to the group identifier, if not, finishing the processing, if so, further determining whether the G-RNTI is received for the first time, if so, establishing a trunking control plane channel corresponding to the G-RNTI, then informing the second processing unit to execute a self function, and if not, directly informing the second processing unit to execute the self function;

the second processing unit is configured to receive the signaling message carried on the TCCH channel by using the G-RNRI, determine whether the signaling message is a trunking group call setup message sent on T-SRB0 or a trunking group call release message sent on T-SRB1 by using the LCID, further determine whether the trunking group call setup message is received for the first time if the signaling message is the trunking group call setup message, configure and establish a trunking call service plane entity if the signaling message is received for the first time, perform no processing if the signaling message is not received for the first time, and perform group call resource release if the signaling message is the trunking group call release message.

9. The clustered user terminal of claim 8 further comprising:

and the receiving unit is used for receiving the broadcast message from the base station and acquiring the sending opportunity and sending cycle information of the TPCCH carried in the broadcast message, wherein the sending opportunity is the sending position information of the TPCCH.

Images