CN101317469B - Method and system for sending short data in cluster group - Google Patents

Abstract

The invention discloses a method and system for sending short data in a cluster group, wherein the method includes: when a speaker sends short data, the short data is sent uplink to the wireless communication system network through the occupied speaker dedicated channel side; when the listener sends short data, the short data is sent uplink to the wireless communication system network side through the group call channel of the cluster group in the cell; after the wireless communication system network side receives the short data sent by the speaker or the listener, Broadcast short data. Therefore, the method and system provided by the embodiment of the present invention can send short data in a trunk group in the 1.5 uplink occupation mode and allow PTT preemption, and realize simultaneous interpretation of short data and voice.

Description

A method and system for sending short data in a cluster group

technical field

The invention relates to the trunking group call technology in the communication system, in particular to a method and system for sending short data in the trunking group. the

Background of the invention

Global System for Mobile Communications (GSM) is a standard launched by the European Committee for Standardization in 1992. It uses data communication technology and unified network standards to ensure communication quality and develop more new services for users. the

GSM-R, that is, the GSM system that serves railways, provides a common communication platform for railway staff, and can be used as a railway control system to meet the current and future needs of the railway network. It is a system facility designed, built and used directly for railway transportation production and railway information services. It mainly completes functions such as railway dispatching communication, station communication, emergency communication, section communication, official communication, and transportation information transmission. the

GT800 digital trunking system is based on the GSM system, adopts a network structure similar to GSM, and adds a variety of application processing platforms for industry users. The GT800 system adds nodes on the GSM basic network that are convenient for command and dispatch applications, such as function number nodes (FFN), group call registers (GCR), and so on. The addition of queuing machine equipment facilitates the access of the dispatcher to the network, providing more flexible support for command and dispatch applications. The GT800 system refers to the service functions of various mature digital trunking systems and the service characteristics of the GSM network itself, and forms a unique digital trunking service system of GT800. GT800 can be applied to command and dispatch services such as group calls, dispatcher checking calls, list query calls, private calls, and voice broadcasting. the

In GT800 digital trunking system or GSM-R, there are two different uplink occupation modes for group calls: 1.0 uplink occupation mode and 1.5 uplink occupation mode. In the 1.0 uplink occupation mode, the speaker occupies the group call uplink channel of the trunk group. When there is a speaker, the group call channel of the trunk group in the cell where the speaker is located is busy; The dedicated channel for the talker in the group. When there is a talker, the uplink of the group call channels of all the cells of the cluster group to which the talker belongs is idle. .

However, at present, in the wireless communication system with group call function based on GSM technology, the simultaneous transmission of short data during the speaking process has not yet been realized in the 1.5 uplink occupation mode, that is, simultaneous interpretation of data and voice. As a result, it is impossible to implement services that require simultaneous interpretation of data and voice. The data here refers to short data. This short data is generally a fixed and very short message. The content of the message is pre-defined, and generally supports short messages within 256 pieces. Realized by encoding less than 8 bits (BIT), short data transmission delay requires short, generally within 500 milliseconds (ms). the

Contents of the invention

The embodiment of the present invention provides a method and system for sending short data in a cluster group, the method can send short data in a cluster group with 1.5 uplink occupancy mode and allowing push to talk (PTT, push to talk) preemption , realizing simultaneous interpretation of short data and voice. the

The embodiment of the present invention is realized like this:

A method of sending short data within a cluster group, the method comprising:

When the speaker sends short data, the short data is sent uplink to the network side of the wireless communication system through the channel dedicated to the speaker; when the listener sends short data, the short data is sent uplink through the group call channel of the cluster group in the cell To the network side of the wireless communication system;

After receiving the short data sent by the speaker or the listener, the network side of the wireless communication system broadcasts the short data. the

A system for sending short data in a cluster group, the system includes a terminal and a network side device in a cluster group, wherein,

The terminal is used to uplink the short data to the network side device through the occupied dedicated channel or the group call channel of the trunk group in the cell, wherein, when the terminal is currently the speaker in the trunk group, through the trunk group Send short data on the occupied dedicated channel; when the terminal is currently a listener in the trunk group, send short data uplink through the group call channel of the trunk group in the cell;

The network side device is configured to receive the short data sent by the terminal and broadcast the short data. the

A method of sending short data within a cluster group, the method comprising:

The wireless communication system network side receives the short data sent uplink by the talker through the occupied talker dedicated channel; or receives the short data sent uplink by the listener through the group call channel of the cluster group in the cell;

After receiving the short data sent by the speaker or the listener, the network side of the wireless communication system broadcasts the short data. the

The embodiment of the present invention redefines the short data message sent by the speaker or listener of the cluster group. When the network side of the wireless communication system receives the message sent by the speaker or the listener, it recognizes that the message is used for the sending process of short data. , broadcast the short data sent by the speaker or listener in the cluster group. Since the sending process of the short data and the voice sending process of the trunking group or the uplink preemption of the trunking group are set as two independent processes in the embodiment of the present invention, and the extended access pulse (AB) is adopted when the listener sends the short data message, so that the network side of the wireless communication system can recognize that the received message is a short data request uplink, thereby broadcasting the received short data in the cluster group. Send short data within the cluster group that is occupied and allows PTT preemption to realize simultaneous interpretation of short data and voice. the

Brief description of the drawings

Fig. 1 is the flow chart of the method that speaker sends short data in the embodiment of the present invention;

Fig. 2 is the flow chart of the method for the speaker to send short data across the BSC in the embodiment of the present invention;

Fig. 3 is the flow chart of the method that the lecturer of the embodiment of the present invention sends short data to the specified listener;

Fig. 4 is the flow chart of the method that listener sends short data of the embodiment of the present invention;

Fig. 5 is the flow chart of the method for the listener to send short data across the BSC in the embodiment of the present invention;

Fig. 6 is the flow chart of the method for the listener to send short data to the specified receiver in the embodiment of the present invention;

FIG. 7 is a flowchart of a method for resending short data according to an embodiment of the present invention. the

The way of implementing the present invention

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings. the

The method provided by the embodiment of the present invention can transmit short data without interrupting the transmission of voice in the cluster group that allows PTT preemption under the 1.5 uplink occupation mode, that is, short data and voice are broadcast simultaneously. In the wireless communication system with group call function, the simultaneous interpretation of short data and voice is realized in the trunking group that allows PTT preemption under the 1.5 uplink occupation mode. the

In 1.5 uplink occupation mode, since the speaker occupies the speaker dedicated channel in the cluster group, when sending short data, it can send short data uplink through the occupied speaker dedicated channel; The short data is sent uplink on the group call channel, that is, the group call channel of the trunk group is occupied by the extended AB message to send short data uplink. When the listener sends short data, it needs to occupy the group call channel of the trunking group for uplink, but in order to realize the simultaneous interpretation of short data and voice, this kind of uplink occupation should be distinguished from the normal uplink occupancy, so as to avoid affecting the uplink of the channel dedicated to the speaker. normal uplink occupation of speakers or other listeners. Therefore, the embodiment of the present invention defines the extended AB message, so that the network side of the wireless communication system with the group call function can know that the uplink of the short data is currently occupied when receiving the extended AB message. the

In the implementation of the present invention, whether the listener sends short data or the speaker sends a message carrying short data, in order to make the network side of the wireless communication system know that the received message is carrying short data when receiving short data, the present invention Embodiments define messages that carry short data. When the network side of the wireless communication system receives the message carrying the short data, it broadcasts the short data downlink through the channel dedicated to the speaker and the group call channel of the trunking group. the

The following describes in detail the sending of short data by the speaker and the sending of short data by the listener respectively. the

Speaker sends short data

Assuming that the trunk group group call has been established, the speaker in the trunk group resides on the channel dedicated to the speaker, and sends voice to the network side of the wireless communication system through the channel dedicated to the speaker, and the network side of the wireless communication system passes The group call channel of the group downlink broadcasts the voice sent by the speaker to the listeners. At this time, the speaker needs to send short data, carry the short data in the Layer 3 message, and send it up to the network side of the wireless communication system through the channel dedicated to the speaker, and the network side of the wireless communication system sends the short data carried in the message to the speaker The group call channel of the cluster group and the channel dedicated to the speaker are downlinked for broadcasting. the

Fig. 1 is the flow chart of the method for the speaker to send short data according to the embodiment of the present invention. The network entities involved in the method include a mobile station (MS), a base transceiver station (BTS) and a BSC on the network side of the wireless communication system, wherein the MS is For the speaker in the cluster group, the BTS is the BTS of the cell where the speaker is located, and the BSC is the BSC of the cell where the speaker is located. The specific steps are: 

Step 100, the MS sends a Layer 3 message frame (I frame) to the BTS uplink through the speaker dedicated channel, that is, a short data service request (SMD Service Request), carrying short data. the

Wherein, the uplink of the talker dedicated channel may be a fast associated control channel (FACCH) uplink. the

The SMD Service Request can also carry the identity of the MS, such as the International Mobile Subscriber Identity (IMSI) of the MS. the

Step 101, the BTS forwards the SMDService Request to the BSC using a data indication (DATA IND) message. the

Step 102: After receiving the SMD Service Request, the BSC obtains the short data carried by it, and carries the short data in the short data service notification (SMD Notification) message to downlink through the group call channel of the cluster group where the MS is located and the speaker dedicated channel. to broadcast. the

Wherein, the group call channel and speaker dedicated channel for broadcasting short data may be FACCH. the

In the prior art, the BSC can administer multiple cells, and when broadcasting the SMD Notification message, it will be broadcast in the cells of all cluster groups where the MSs under the jurisdiction of the BSC are located. the

The SMD Notification message can also carry the identifier of the MS, such as the International Mobile Subscriber Identity (IMSI) of the MS. the

In the embodiment of the present invention, when the cluster group crosses BSCs, short data can also be sent across BSCs, as shown in Figure 2, where BSC1 and BTS1 are MS1, that is, the BSC and BTS to which the speaker belongs; BSC2 and BTS2 are Administer another BSC and BTS in the area where the trunk group is located. MS2 is the listener of the trunk group under the jurisdiction of BSC2. The mobile service switching center (MSC) governs BSC1 and BSC2. The specific steps for the speaker to send short data are:

Step 200, MS1 sends an SMD ServiceRequest uplink to BTS1 through the speaker dedicated channel, carrying short data. the

Wherein, the speaker dedicated channel uplink may be FACCH uplink. the

SMD Service Request can also carry the identification of MS. the

Step 201, BTS1 forwards the SMD ServiceRequest to the BSC using the DATA IND message. the

Step 202, BSC1 forwards the SMD Service Request to MSC1 by using a short data service report (SMD REPORT) message. the

Steps 203 to 204, after receiving the SMD Service Request, MSC1 obtains the carried short data, carries the short data in a short data service notification (SMD NOTIFY) message and sends it to BSC1 and MSC2. the

In the embodiment of the present invention, the difference between the SMD NOTIFY message and the SMD Notification message is that the SMD NOTIFY message is an uplink message, while the SMD Notification message is a downlink message. the

Step 205, MSC2 forwards the received SMD NOTIFY message to BSC2. the

Steps 206 to 207, BSC1 uses the SMD Notification message to broadcast the received short data carried in the SMD NOTIFY through the downlink of the group call channel of the cluster group under its jurisdiction and the downlink of the speaker dedicated channel; BSC2 broadcasts the received short data carried in the SMD Notification message The short data in SMD NOTIFY uses SMD Notification message to broadcast downlink through the group call channel of the cluster group under its jurisdiction. the

When sending short data across BSCs, the BSCs on the network side of the trunking system are all set with an identifier for forwarding short data. When the BSC receives the short data, it will determine according to the identifier that the short data is broadcast within the area under the jurisdiction of the BSC. It is still further sent to MSC, and MSC broadcasts short data in the area under its jurisdiction. the

Correspondingly, when MSC sends short data to BSC, also send to the BSC that is provided with forwarding short data mark. the

In the embodiment of the present invention, the speaker can also designate a certain listener in the cluster group to receive when sending short data, which not only avoids the short data from affecting the voice quality on the channel dedicated to the speaker, such as FACCH, but also avoids short data Data interference to other listeners who are receiving voice downlink on the group call channel of the trunk group. the

The difference between the method for the speaker to designate a certain listener in the cluster group to receive the short data and the method described in Figure 1 is that the speaker also carries the specified listener ID when sending the short data to the network side of the trunking system. The designated listener ID indicates the listener to whom the short data is sent. After receiving the designated listener ID, the network side of the trunking system determines the area where the listener with the designated listener ID is located, and broadcasts the short data in the determined area. the

3 is a flow chart of a method for a speaker to send short data to a designated listener in an embodiment of the present invention. The network entities involved in the method include MS, BTS, BSC and core network (NSS) on the network side of the wireless communication system, wherein the MS is For the speaker in the cluster group, BTS is the BTS of the cell where the speaker is located, BSC is the BSC of the cell where the speaker is located, and NSS is the NSS that governs the cluster group of the speaker. The entities in the NSS include multiple MSCs and visiting locations Register (VLR), message forwarding can also be performed between MSCs in the NSS, and the specific steps are:

In step 300, the MS sends a Layer 3 message frame (I frame), namely SMD Service Request, to the BTS uplink through the talker-dedicated channel, carrying short data and a specified listener ID. the

The designated listener identifier may be the designated listener's IMSI or the designated listener's Mobile Subscriber Integrated Services Digital Network Number (MSISDN). the

Step 301, BTS uses DATA IND message to forward SMD ServiceRequest to BSC. the

Step 302, BSC uses SMD REPORT message to forward SMD ServiceRequest to NSS. the

Step 303, after the NSS receives the SMD Service Request, obtain the carried short data and the specified listener ID, determine the region where the listener with the carried listener ID is located, and carry the short data and the specified listener ID in the SMD NOTIFY message and send it to the BSC in charge of the determined area (in Figure 3, the BSC is the BSC where the MS is located). the

When the NSS receives the SMD Service Request, it will judge whether it carries the specified listener ID. If not, use the method described in Figure 2 to broadcast the short data in the SMDNotification message via the BSC; Including MSC and VLR, the MSC and VLR interact according to the existing technology to verify whether the listener with the specified listener ID has subscribed to the cluster group where the MS is located, and if so, find the listener with the specified listener ID according to the existing technology In the area where the listener is located, carry the short data in the SMD NOTIFY message and send it to the BSC that governs the determined area, otherwise, the NSS will discard the SMD Service Request. the

Step 304, the BSC that governs the determined area carries the short data and the designated listener's identification in the SMD Notification message and broadcasts it downlink through the group call channel of the cluster group in the area under its jurisdiction (shown as passing through the group where the MS is located in Figure 3 ) Group call channel downlink and talker dedicated channel downlink for broadcasting). the

If the speaker is not in the area governed by the BSC that governs the determined area, the short data will not be broadcast downlink through the channel dedicated to the speaker. the

Listener sends short data

Because in the 1.5 uplink occupation mode, no matter whether there is a talker in the trunk group that has established a group call, the uplink channel of the trunk group is idle, and the listener can be on the group call channel of the trunk group in the cell Uplink reports the extended AB message, the extended AB message carries a reason value, and requests to occupy the group call channel of the trunk group of the cell where the listener is located to send short data, and then passes through the group call channel of the trunk group of the cell where the listener is located. Call channel to send short data. the

The format of the extended AB message is shown in Table 1:

information value cause value

8...1 0110xxxx Send short data

Table 1

When the extended AB message carries 0110, it means requesting to occupy the uplink group call channel of the trunk group of the cell where the listener is located for sending short data. Of course, in the embodiment of the present invention, other binary numbers can also be set in the extended AB message, as long as the network side of the wireless communication system can recognize the binary number carried in the extended AB message according to the preset rules to indicate the request to occupy the cluster of the cell where the listener is located. The uplink of the group call channel of the group can be used to send short data. the

The embodiment of the present invention uses the extended AB message, which mainly has the following advantages: First, the uplink occupation of short data is completely separated from other uplink preemption, and correspondingly, the network side of the wireless communication system determines to broadcast short data after receiving the extended AB message. Data; second, for the uplink occupation of short data, it is not necessary to report an uplink request (UPLINK REQ) message to the MSC on the network side of the wireless communication system like preempting the uplink, which does not affect the voice of the speaker in the group call within the trunking group Third, for the uplink occupancy of short data, the BSC on the network side of the wireless communication system can separately process the cell to which the listener belongs, and the listener sends the extended AB message and short data in the cell to which the listener belongs without affecting other The cell initiates short data transmission or occupies the uplink; fourth, the uplink occupation of short data does not require the BSC and MSC on the network side of the wireless communication system to exchange messages through the A interface, and the A interface does not need to extend the short data message. the

4 is a flowchart of a method for a listener to send short data according to an embodiment of the present invention. The network entities involved in the method include MS, BTS and BSC on the network side of the wireless communication system, wherein the MS is the listener in the cluster group, and the BTS is The BTS of the cell where the listener is located, and the BSC is the BSC of the cell where the listener is located. The specific steps are:

Step 400, the BTS sends an uplink free (Uplink Free) message of the group call channel of the trunking group in the jurisdictional cell. the

In 1.5 uplink occupation mode and PTT preemption is allowed, no matter whether the speaker of the trunk group is speaking through the speaker dedicated channel or not, as long as no MS occupies the group call channel of the trunk group for uplink, the BTS will send an Uplink Free message. the

Step 401, the MS sends an Uplink Access (Uplink Access) message, requesting to occupy the group call channel of the cluster group in the cell to send short data uplink, and the Uplink Access message is an extended AB message, which carries the cause value defined by the present invention to indicate that it needs to The uplink of the group call channel occupied by the trunking group is used to send short data. the

Step 402, the BTS sends a short data detection (Data Detect) message to the BSC, which is used to notify the BSC that an MS will occupy the group call channel of the trunking group of the cell where the MS is located to send short data uplink. the

The message structure of the Data Detect message is the same as the message structure of the Talker Detect message sent by the BTS to the BSC when the listener initiates uplink preemption in the prior art, but the process of the BSC processing the Data Detect message is the same as the process of processing the Talker Detect message Not the same: There is no need for message interaction with the MSC, thus avoiding the impact on the voice transmission of the speakers in the cluster group due to sending short data. the

Step 403, the BTS sends a response (Uplink Grand) to the uplink occupying message to the MS. the

Step 404, MS sends asynchronous balanced mode (SABM) message to BTS, and this message carries SMD Service Request, and SMD Service Request includes short data and IMSI of MS. the

SABM messages are Layer 3 messages. the

Step 405, the BTS sends a response (UA) of the SABM message to the MS. the

Step 406, the BTS sends a link establishment instruction (EST IND) message to the BSC, and the message carries the SMD Service Request sent by the MS. the

The execution order of step 405 and step 406 can be exchanged. the

Step 407: The BSC broadcasts an uplink group call channel busy (Uplink Busy) message in the cell where the MS is currently located, which is used to indicate that the group call channel uplink of the trunk group is busy in the cell where the MS is currently located. the

For the uplink preemption in the prior art, the BSC sends Uplink Busy in all the cells of the cluster group under its jurisdiction, but in the short data request uplink of the present invention, the BSC only sends Uplink Busy in the cell where the MS is currently located, so that the cluster groups are different The short data sent by the cells are independent of each other, and at the same time, it is also avoided that the sending of short data affects the short data requests of other cells to request uplink or preempt uplink. the

Step 408, the BSC sends an uplink release (UplinkRelease) message to the MS through the group call channel to release the uplink of the group call channel occupied by the MS. the

Step 409, the BSC sends a release request (REL REQ) to the BTS, instructing the BTS to release the uplink of the group call channel occupied by the MS. the

Step 410, after releasing the uplink of the group call channel occupied by the MS, the BTS sends a release confirmation (REL CNF) to the BSC to confirm that the uplink of the group call channel occupied by the MS has been released. the

Step 411, the BSC broadcasts an uplink group call channel free (UplinkFree) message in the cell where the MS is currently located, indicating that other MSs in the cell where the MS is currently located and that the MS can initiate a short data request uplink or preempt uplink. the

Step 412, the BSC broadcasts an SMD Notification message in all the cells of the cluster group under its jurisdiction, and the SMD Notification message carries short data. the

The BSC's broadcast in all the cells of the cluster group under its jurisdiction is actually the downlink transmission of all the group call channels of the cluster group and the speaker's dedicated channel. the

If there is no talker dedicated channel in the trunk group, it will only be sent on the downlink of all group call channels in the trunk group. the

The SMD Notification message may also carry the IMSI of the MS. the

In the prior art, the BSC can administer multiple cells, and when broadcasting the SMD Notification message, it will be broadcast in the cells of all cluster groups where the MSs under the jurisdiction of the BSC are located. the

In the present invention, when the cluster group crosses BSCs, it is also possible to send short data across BSCs, as shown in Figure 5, wherein BSC1 and BTS1 are MS1, that is, the BSC and BTS to which the listener belongs; BSC2 and BTS2 are governing sets Another BSC and BTS in the area where the group is located, MS2 is another listener or speaker of the cluster group under the jurisdiction of BSC2, MSC1 governs BSC1, MSC2 governs BSC2, and the specific steps are:

Step 500, BTS1 sends the Uplink Free message of the cluster group in the jurisdiction cell. the

Step 501, MS1 sends an Uplink Access message, requesting to occupy the group call channel of the cluster group in the cell to send short data uplink, the UplinkAccess message is an extended AB message, which carries the cause value defined in the embodiment of the present invention to indicate that the cluster is to be occupied The group call channel uplink of the group is used to send short data. the

Step 502, BTS1 sends a Data Detect message to BSC1 to notify BSC1 that MS1 wants to occupy the group call channel of the trunking group of the cell where MS1 is located to send short data uplink. the

The message structure of the Data Detect message is the same as the message structure of the Talker Detect message sent by the BTS to the BSC when the listener initiates uplink preemption in the prior art. However, the process of processing the Data Detect message by BSC1 is different from the process of processing the Talker Detect message: there is no need to communicate with MSC1 performs message interaction, thereby avoiding the voice transmission of the speakers in the cluster group being affected by sending short data. the

Step 503, BTS1 sends Uplink Grand to MS1. the

Step 504, MS1 sends a SABM message to BTS1, the message carries SMD Service Request, and the SMD Service Request includes short data and MS1's IMSI. the

SABM messages are Layer 3 messages. the

Step 505, BTS1 sends the UA of the SABM message to MS1. the

Step 506, BTS1 sends an EST IND message to BSC1, and the message carries the SMD Service Request sent by MS1. the

Step 507, BSC1 forwards the SMD ServiceRequest to MSC1 using the SMD REPORT message. the

Step 508, BSC1 broadcasts an Uplink Busy message in the cell where MS1 is currently located, which is used to indicate that the uplink of the group call channel of the trunking group is busy in the cell where MS1 is currently located. the

Step 509, BSC1 sends an Uplink Release message to MS1 through the uplink of the group call channel, releasing the uplink of the group call channel occupied by MS1. the

Step 510, BSC1 sends REL REQ to BTS1, instructing BTS1 to release the uplink of the group call channel occupied by MS1. the

Step 511: After releasing the uplink of the group call channel occupied by MS1, BTS1 sends a REL CNF to BSC1 to confirm that the uplink of the group call channel occupied by MS1 has been released. the

Step 512, BSC1 broadcasts an Uplink Free message in the cell where MS1 is currently located, indicating that other MSs in the cell where MS1 is currently located and MS1 can initiate a short data request uplink or preempt uplink. the

Steps 513-514: After receiving the SMD Service Request, MSC1 obtains the carried short data, carries the short data in the SMD NOTIFY message and sends it to BSC1 and MSC2. the

Step 515, MSC2 forwards the SMD NOTIFY message to BSC2. the

Steps 516 to 517, BSC1 broadcasts the received short data carried in the SMD NOTIFY message using the SMD Notification message through the downlink of the group call channel and the speaker dedicated channel of the cluster group under its jurisdiction; BSC2 broadcasts the received short data carried in the SMD NOTIFY message The short data in the SMDNOTIFY message uses the SMD Notification message to broadcast downlink through the group call channel of the cluster group under jurisdiction. the

When sending short data across BSCs, the BSC on the network side of the trunking system is set with an indicator of whether to further send the short data to the MSC. When the BSC receives the short data, it will determine whether it is in the area under the jurisdiction of the BSC according to the indicator. Broadcast the short data, or send it further to the MSC, and the MSC broadcasts the short data in the area under its jurisdiction. the

In the embodiment of the present invention, the listener can also designate other listeners or speakers in the cluster group to receive when sending short data, not only avoiding the impact of short data on the channel dedicated to the speaker, such as FACCH, for voice quality transmission, And avoid the interference that short data produces to other listeners who are receiving voice downlink through the group call channel of the trunking group. the

The difference between the method in which the listener specifies a listener in the cluster group to receive the short data and the method described in FIG. The designated receiver ID indicates the listener or speaker to whom the short data is sent. After receiving the designated receiver ID, the network side of the trunking system determines the area where the listener or speaker with the designated receiver ID is located. In the determined area Broadcast short data. the

Fig. 6 is a flowchart of a method for a listener to send short data to a designated receiver according to an embodiment of the present invention. The network entities involved in the method include MS, BTS, BSC and NSS on the network side of the wireless communication system, wherein the MS is in the cluster group BTS is the BTS of the cell where the listener is located, BSC is the BSC of the cell where the listener is located, and NSS is the NSS where the cluster group that governs the listener is located. The entities in the NSS include MSC and VLR, and the MSC in the NSS Messages can also be forwarded during the period, the specific steps are:

Step 600, the BTS sends an Uplink Free message of the cluster group in the jurisdictional cell. the

Step 601, the MS sends an Uplink Access message, requesting to occupy the group call channel of the trunk group of the cell where it is located and send short data uplink. the

Step 602, the BTS sends a Data Detect message to the BSC. the

Step 603, BTS sends Uplink Grand to MS. the

Step 604, MS sends SABM message to BTS, this message carries SMD Service Request, and SMD Service Request includes short data and receiver's identification. the

Step 605, the BTS sends the UA to the MS. the

Step 606, the BTS sends an EST IND message to the BSC, and the message carries the SMD Service Request sent by the MS. the

The execution order of step 605 and step 606 can be exchanged. the

Step 607, the BSC sends an SMD REPORT message to the NSS, and the message carries the SMD Service Request sent by the MS. the

When the NSS receives the SMD Service Request, it will judge whether it carries the specified listener ID. If not, use the method described in Figure 5 to broadcast the short data in the SMDNotification message via the BSC; Including MSC and VLR, the MSC and VLR interact according to the existing technology to verify whether the listener or speaker with the specified receiving ID has signed up for the cluster group where the MS is located, and if so, find the specified listener according to the existing technology The area where the identified listener is located, otherwise, NSS will discard the SMD Service Request. the

Step 608, the BSC broadcasts an Uplink Busy message in the cell where the MS is currently located. the

Step 609, the BSC sends an Uplink Release message uplink to the MS through the group call channel. the

Step 610, BSC sends REL REQ to BTS. the

Step 611, after the BTS releases the uplink of the group call channel occupied by the MS, it sends RELCNF to the BSC. the

Step 612, the BSC broadcasts an Uplink Free message in the cell where the MS is currently located. the

Step 613, the NSS carries the short data and the designated listener ID in the SMD NOTIFY message and sends it to the BSC that governs the determined area (in Figure 6, the BSC is the BSC where the MS is located). the

Step 614, the BSC that governs the determined area carries the short data and the designated listener's identification in the SMD Notification message and broadcasts it downlink through the group call channel of the cluster group in the area under its jurisdiction (represented as passing through the set where the MS is located in Figure 6 ) Group call channel downlink and talker dedicated channel downlink for broadcasting). the

If the speaker is not in the area governed by the BSC that governs the determined area, the short data will not be broadcast downlink through the channel dedicated to the speaker. the

In the embodiment of the present invention, since the MSC in the NSS can only determine the area where the listener with the specified listener ID is currently located through the location update of the prior art, it cannot accurately determine the area where the listener with the specified listener ID is currently located. Therefore, the NSS can only carry the short data in the SMD NOTIFY message and send it to the BSC that has jurisdiction over the determined area. the

In the embodiment of the present invention, when the listener or speaker of the cluster group receives the SMD Notification message, it is first judged whether the SMD Notification message carries the designated recipient identification, if not, receive the short data carried; if so, Then judge whether the designated receiver identification carried is consistent with the one set by itself, if yes, receive the short data carried; if not, discard the SMD Notification message. the

In order to improve the reliability of sending short data, the embodiment of the present invention also provides the function of the BSC rebroadcasting the SMD Notification message. In the embodiment of the present invention, the times and intervals of rebroadcasting SMDNotification messages are set in the BSC. The range of rebroadcasting times can be set to 0-5, and 0 means that rebroadcasting is not required. The range of the retransmission interval can be set from 1 to 10, and the unit is hundreds of ms. The BSC can also perform a default rebroadcast. During the default rebroadcast, the interval is 500ms, and the SMDNotification message is rebroadcasted twice. the

Figure 7 is a flowchart of a method for resending short data according to an embodiment of the present invention. The network entities involved in the method include BSC and BTS on the network side of the wireless communication system, and listeners or speakers of the cluster group. The specific steps are:

Step 700, BSC receives the short data of a cluster group sent by the listener or the speaker forwarded by the BTS, and broadcasts the short data in the cluster group using the steps described in Figure 1 or Figure 2, and then broadcasts the short data for the cluster group The group caches short data and records the actual number of rebroadcasts as 0. the

Step 701, BSC starts the timer according to the configured rebroadcast interval time, when the timer expires, after rebroadcasting the SMD Notification message carrying the cached short data, update the actual rebroadcast times. the

The timer is at the trunk group call level, and a timer is set in the BSC for each trunk group. the

Step 702 , the BSC judges whether the actual number of rebroadcasts has reached the set number of rebroadcasts, and if so, proceeds to step 703 ; otherwise, proceeds to step 704 . the

Step 703, the BSC releases the buffered short data, and ends. the

Step 704, transfer to step 701 to continue execution. the

When new short data is sent to the BSC in the cluster group, the BSC stops the timing of the timer and releases the cached short data, caches the received new short data and executes according to the steps described in FIG. 7 . the

Through the method provided by the embodiment of the present invention, in a wireless communication system with a group call function, such as a wireless communication system with a group call function based on GSM technology, a cluster under the 1.5 uplink occupation mode and allowing PTT preemption can be realized Simultaneous interpretation of downlink short data and voice on the group call channel, realizing 1.5 uplink occupancy mode and allowing PTT preemption. The speaker in the trunk group transmits simultaneously during the speech process or the listener in the trunk group short data. the

The embodiment of the present invention also provides a system for sending short data in a cluster group, the system includes a terminal in the cluster group and a network side device, wherein the terminal is used to pass the occupied dedicated channel or the collective The group call channel of the group sends the short data uplink to the network side device; the network side device is used to receive the short data sent by the terminal and broadcast the short data. the

In the embodiment of the present invention, when the terminal is currently the speaker in the trunk group, the short data is sent through the occupied dedicated channel; when the terminal is currently the listener in the trunk group, the short data is sent through the cell The group call channel of the trunk group sends short data uplink. the

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. the

Claims (22)

1. A method for sending short data in a cluster group, characterized in that the method comprises: When the speaker sends short data, the short data is sent uplink to the network side of the wireless communication system through the channel dedicated to the speaker; when the listener sends short data, the short data is sent uplink through the group call channel of the cluster group in the cell To the network side of the wireless communication system; so that the network side of the wireless communication system broadcasts the short data after receiving the short data sent by the speaker or the listener. 2. The method according to claim 1, wherein the process of the speaker sending short data to the network side of the wireless communication system is: The speaker sends a short data service request SMD Service Request uplink to the base transceiver station BTS on the network side of the wireless communication system through the speaker dedicated channel, carrying short data; The BTS uses the data instruction DATA IND message to forward the SMD Service Request carrying the short data to the base station controller BSC on the network side of the wireless communication system. 3. The method according to claim 2, characterized in that, said SMD Service Request also carries the speaker's identification. 4. The method according to claim 2, characterized in that, in the BSC, the sign of forwarding the short data is set, and the process of the speaker sending the short data to the wireless communication system network side also includes: The BSC determines to send the short data to the mobile switching center MSC on the network side of the wireless communication system according to the set identifier, and uses the short data service report SMD REPORT message to forward the SMD Service Request carrying the short data to the MSC. 5. The method according to claim 4, wherein said SMD Service Request also carries a specified listener identification. 6. the method for claim 4, is characterized in that, the mark of forwarding short data is set in BSC, and the process of described broadcast short data is: After the MSC receives the short data sent by the speaker, it will carry the short data in the short data service notification SMD NOTIFY message and send it to one or more BSCs that set the forwarding short data identifier, and the BSC determines to broadcast the short data according to the set identifier , the short data is carried in the short data service notification message SMD Notification message and broadcast downlink through the group call channel of the trunking group or/and the speaker dedicated channel. 7. The method according to claim 6, wherein said SMD Notification message carries a specified listener identification. 8. The method according to claim 6, characterized in that, before the BSC broadcasts the short data, the method further comprises: The core network NSS that governs the MSC judges whether the listener corresponding to the specified listener ID carried by the received SMD Service Request has signed a cluster group, and if so, carries the short data in the SMD NOTIFY message and sends it to the jurisdiction with the specified listener ID The listener's BSC; otherwise, discard the received SMD Service Request. 9. The method according to claim 1, wherein the process of the listener sending short data to the network side of the wireless communication system is: When the uplink of the group call channel of the trunking group is idle, the listener sends an asynchronous balanced mode SABM message carrying an SMD Service Request to the BTS on the network side of the wireless communication system, and the SMD Service Request includes the short data to be sent by the listener. 10. The method of claim 9, wherein, before the listener sends the SABM message, the method comprises: After receiving the Uplink Free message of the group call channel broadcast by the BTS, the listener sends an Uplink Access message to the BTS; The BTS sends a short data detection Data Detect message to the BSC on the network side of the wireless communication system, and sends an Uplink Grand response to the uplink occupancy message to the listener; After the listener sends the SABM message, the method also includes: The BTS sends the SABM message response UA to the listener, and sends the link establishment instruction ESTIND message to the BSC, which carries the SMD Service Request sent by the listener. 11. The method according to claim 10, characterized in that, the Uplink Access message is an extended access pulse AB message, which carries a cause value indicating that the group call channel of the trunk group is to be occupied to send short data uplink. 12. The method according to claim 10, wherein said SMD Service Request also includes a listener's identifier. 13. The method according to claim 10, characterized in that, the mark for forwarding short data is set in the BSC, the method also includes: The BSC determines to send the short data to the MSC according to the set identifier, and uses the SMD REPORT message to forward the SMD Service Request carrying the short data to the MSC on the network side of the wireless communication system. 14. The method according to claim 10, characterized in that, said SMD Service Request also includes a specified receiver ID. 15. The method according to claim 9, wherein the process of broadcasting short data is: The BSC of the wireless communication system releases the uplink of the group call channel occupied by the listener, and instructs the BTS of the wireless communication system to release the uplink of the group call channel occupied by the listener, and broadcast on the downlink of the group call channel or/and the speaker dedicated channel of the trunking group SMD Notification message, the SMDNotification message carries short data. 16. The method according to claim 15, wherein the process for the BSC to release the uplink of the group call channel occupied by the listener is: The BSC sends an uplink group call channel busy Uplink Busy message in the cell where the listener is currently located, and sends an uplink release message to the listener through the group call channel uplink, releasing the group call channel occupied by the listener for uplink; The process of instructing the BTS to release the uplink group call channel occupied by the listener is: The BSC sends a release request REL REQ to the BTS, instructing the BTS to release the uplink of the group call channel occupied by the listener; After the BTS releases the uplink of the group call channel occupied by the listener, it sends a release confirmation RELCNF to the BSC; Before the broadcast SMD Notification, the method also includes: The BSC sends an uplink group call channel idle Uplink Free message in the cell where the listener is currently located. 17. The method according to claim 15, wherein the SMDNotification carries an identifier of a designated recipient. 18. The method according to claim 15, characterized in that, before the BSC broadcasts the short data, the method further comprises: The NSS of the MSC that governs the network side of the wireless communication system judges whether the listener or the speaker who has received the receiver identification carried by the SMDService Request has signed a cluster group, and if so, sends the short data in the SMD NOTIFY message to the designated The BSC of the listener or speaker identified by the recipient; otherwise, the received SMD Service Request is discarded. 19. The method of claim 7 or 17, further comprising: After receiving the SMD Notification message, the listener or speaker of the cluster group judges whether it carries the specified listener or receiver ID, if not, then receives the carried short data; if yes, then judges whether its own ID is consistent with the The carried specified listener ID or receiver ID is the same, if so, receive the carried short data; otherwise, discard the received SMDNotification message. 20. The method according to claim 1, wherein the short data rebroadcast times and the rebroadcast interval are set at the wireless communication system network side, and the method further includes the step of rebroadcasting the short data: A. The network side of the wireless communication system buffers the received short data; B. After starting the timer set for the trunking group and waiting for the set rebroadcast interval, broadcast the buffered short data downlink through the speaker dedicated channel and group call channel of the trunking group and update the actual number of rebroadcasts; C. The network side of the wireless communication system judges whether the actual number of rebroadcasts is greater than the set number of rebroadcasts, if yes, releases the cached short data, and ends this process; otherwise, proceeds to step B to continue execution. 21. A system for sending short data in a cluster group, characterized in that the system includes a terminal and a network side device in a cluster group, wherein, The terminal is used to uplink the short data to the network side device through the occupied dedicated channel or the group call channel of the trunk group in the cell, wherein, when the terminal is currently the speaker in the trunk group, through the trunk group Sending short data on the occupied dedicated channel; when the terminal is currently a listener in the trunking group, sending short data uplink through the group call channel of the trunking group of the cell where it is located; The network side device is configured to receive the short data sent by the terminal and broadcast the short data. 22. A method for sending short data in a cluster group, characterized in that the method comprises: The network side of the wireless communication system receives the short data sent uplink by the talker through the occupied talker dedicated channel; or receives the short data sent uplink by the listener through the group call channel of the cluster group in the cell; After receiving the short data sent by the speaker or the listener, the network side of the wireless communication system broadcasts the short data.

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