CN111741439A - Cluster multicast switching method of B-trunk system - Google Patents
Cluster multicast switching method of B-trunk system Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
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- H04W76/00—Connection management
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- H04W76/19—Connection re-establishment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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Abstract
The invention provides a cluster multicast switching method of a B-trunk system, belonging to the technical field of mobile communication. In the method, in a terminal switching preparation stage, a target base station RRC module identifies a cluster group where a terminal is positioned, informs a PDCP module to stop multicast service data processing and caches received multicast data; and when the terminal successfully switches and admits the target base station, the RRC of the target base station informs the PDCP to recover the multicast data processing and sends the cached multicast data to the cluster group where the terminal is located. When the PDCP receives the indication of stopping sending the multicast data, the multicast timer is started, and if the multicast timer is overtime, the sending of the multicast data is resumed. The invention can discriminate the cluster multicast service terminal in the switching state in time, and avoid the problem of packet loss caused by the incapability of processing multicast data due to terminal switching for about 70ms through the cooperative processing of RRC and PDCP.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a cluster multicast switching method of a B-trunk system.
Background
The China communication standardization association releases the B-trunC broadband trunking communication standard of China, and the B-trunC enhances the functions of broadband trunking services such as voice trunking basic service, supplementary service, multimedia trunking dispatching and the like on the basis of ensuring the compatibility of LTE data service, and has the characteristics of flexible dispatching, high spectrum efficiency, low time delay and high reliability. The main applications of the B-TrunC cluster system are voice group call, video group call, and multicast services, which have high requirements for low delay, low packet loss rate, and high reliability. Relevant researches show that under various application scenes, the success rate of terminal switching and the data processing mode in the switching process are key factors influencing the indexes.
Handover in mobile communication refers to a process in which a terminal needs to transfer information from an originally used channel to a more suitable channel for information transmission when transmitting information with a base station. Generally, when a terminal moves from one radio coverage cell to another radio coverage cell during information transmission with a base station, handover is required due to poor transmission quality of an originally used channel. The trunking multicast service is in a one-transmission multi-reception mode, and after the trunking multicast service data reaches the base station, the base station sends the trunking multicast service data out by using a specific scrambling mode without aiming at a specific terminal. All terminals registered in the base station cluster group commonly receive and decode group data sent by the base station. When the terminal is switched, a process of detaching from a source cell to registering in a destination cell exists, and the process generally takes about 70 ms. In the switching process, the terminal cannot receive the multicast service data sent by the source cell. Under the condition of taking no measures, when the terminal switches to access the target cell and starts to receive the multicast data, the multicast data received by the terminal lacks about 70ms of data packets, which results in higher packet loss rate. Therefore, the group switching process of the trunking communication system in the prior art is insufficient, and the packet loss rate of multicast data is high during cell switching, which affects the user experience of multicast service.
Disclosure of Invention
In view of this, the present invention provides a cluster multicast switching method for a B-TrunC system, which can reduce the packet loss rate of multicast data during cell switching, effectively improve the experience effect of applications such as multicast video playing, and improve the user experience of multicast services.
In order to achieve the purpose, the invention adopts the technical scheme that:
a cluster multicast switching method of a B-trunk system comprises the following steps:
step 1: a source base station sends a switching preparation request message to a core network, carries a source base station identifier, a switching type and destination base station identifier information, and requests the core network to execute the switching of a terminal;
step 2: the core network sends a switching request message to a target base station, carries a switching type, a bearing configuration, terminal capability information and safety configuration information, and triggers the target base station to execute the switching access of the terminal;
and step 3: an RRC (radio resource control) module of the target base station sends a terminal switching access request message to a PDCP (packet data convergence protocol) module to request the PDCP to execute terminal switching access;
and 4, step 4: a PDCP packet data convergence protocol module of the target base station sends a terminal switching access response message to an RRC wireless resource control module, and the PDCP packet data convergence protocol module feeds back the switching access response to the RRC wireless resource control module after completing the terminal switching access;
and 5: an RRC (radio resource control) module of a target base station acquires group identification information of a cluster group where a terminal is located;
step 6: an RRC (radio resource control) module of a target base station sends a multicast data stop request message to a PDCP (packet data convergence protocol) module, and the PDCP module stops sending multicast data;
and 7: a PDCP packet data convergence protocol module of a target base station stops sending the multicast data of the cluster group where the terminal is positioned to the terminal, caches the received multicast data and starts a multicast timer at the same time;
and 8: a PDCP packet data convergence protocol module of the target base station sends a multicast data stop response message to the RRC radio resource control module and feeds back a result of the RRC radio resource control module that the multicast data stop issuing;
and step 9: the target base station sends a switching request confirmation message to the core network, carries the admitted bearer list, target base station cell measurement configuration, mobile configuration, radio bearer and safety algorithm information and informs the base station of the core network to complete the terminal switching admission process;
step 10: the core network sends a switching command message to the source base station and forwards the switching configuration information of the target base station to the terminal to the source base station;
step 11: a source base station sends RRC radio resource control connection reconfiguration information to a terminal, carries a target base station cell identifier and frequency point configuration, measurement configuration, mobile configuration and radio bearer information, and triggers the terminal to execute an air interface switching process;
step 12: the target base station receives an RRC radio resource control connection reconfiguration completion message from the terminal and determines that the terminal is successfully switched;
step 13: the target base station RRC wireless resource control module sends a multicast data recovery indication message to the PDCP packet data convergence protocol module;
step 14: the PDCP packet data convergence protocol module of the target base station recovers the multicast data processing of the cluster group where the terminal is located and stops the multicast timer at the same time;
step 15: the target base station sends a switching notification message to the core network to indicate that the switching is completed successfully.
Further, the RRC radio resource control module of the destination base station in step 5 identifies the group in which the terminal is located according to the group identifier carried in the handover request message.
Further, the sending opportunity of the multicast data stop request message in the step 6 is between the step 4 and the step 9.
Further, the duration of the multicast timer in step 7 is greater than 70ms and less than 200 ms.
Further, in step 7, if the multicast timer is overtime, the PDCP packet data convergence protocol module actively resumes the multicast data processing of the cluster group where the terminal is located.
The invention has the beneficial effects that:
1. in the invention, the target base station determines the time A when the terminal is about to switch to the base station, and the time B when the terminal is successfully switched and allowed to be admitted to the target base station, and the PDCP module of the target base station stops issuing the multicast service in the period from the time A to the time B. When the terminal successfully switches and admits the target base station, the PDCP module recovers to send the multicast service. The method can reduce the packet loss rate of the multicast data during cell switching, and effectively improve the experience effect of applications such as multicast video playing and the like.
2. The invention can discriminate the cluster multicast service terminal in the switching state in time, and avoid the problem of packet loss caused by the incapability of processing multicast data due to terminal switching for about 70ms through the cooperative processing of RRC and PDCP. Through practical tests, the invention achieves good effect in the high-speed multicast transmission switching scene.
3. The probability of failure exists in the terminal switching, and when the terminal fails to switch to the target base station, the behavior of stopping transmitting the multicast data must be recovered. Therefore, the invention adopts the multicast timer, when the PDCP receives the indication of stopping transmitting the multicast data, the multicast timer is started, and if the multicast timer is overtime, the transmission of the multicast data is recovered.
Drawings
Fig. 1 is a flow chart of switching a B-Trunc system cluster multicast terminal in the prior art.
Fig. 2 is a switching flow chart after the B-Trunc system cluster multicast terminal is optimized in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention is described in further detail with reference to the accompanying drawings and specific examples.
Fig. 1 is a multicast switching flow of a B-Trunc system cluster in the prior art, which includes the following steps:
step 101: a source base station sends a switching preparation request message to a core network, carries information such as a source base station identifier, a switching type, a target base station identifier and the like, and requests the core network to execute the switching of a terminal;
step 102: the core network sends a switching request message to a target base station, carries information such as switching type, bearing configuration, terminal capability information, safety configuration and the like, and triggers the target base station to execute the terminal switching access;
step 103: after preparing relevant resources of a terminal, a target base station sends a switching request confirmation message to a core network, carries information such as an allowed bearing list, target base station cell measurement configuration, mobile configuration, radio bearing, safety algorithm and the like, and informs the base station of the core network of completing a terminal switching allowed process;
step 104: the core network sends a switching command message to the source base station and forwards the switching configuration of the target base station to the terminal to the source base station;
step 105: a source base station sends an RRC connection reconfiguration message to a terminal, carries information such as a target base station cell identifier, frequency point configuration, measurement configuration, mobile configuration, radio bearer and the like, and triggers the terminal to execute an air interface switching process;
step 106: the terminal sends RRC connection reconfiguration completion information to the target base station, indicates the terminal to successfully access the target base station and completes switching;
step 107: the target base station sends a switching notification message to the core network to indicate that the switching is completed successfully.
In the time from the step 103 to the step 106, the cluster group where the terminal in the destination base station is located continuously issues the multicast data. In fig. 1, the time length from time a to time B is about 70ms, and the terminal performs cell search and random access procedures, and cannot receive and process multicast data.
Fig. 2 is an optimized handover procedure, which includes the following steps:
step 201: a source base station sends a switching preparation request message to a core network, carries information such as a source base station identifier, a switching type, a target base station identifier and the like, and requests the core network to execute the switching of a terminal;
step 202: the core network sends a switching request message to a target base station, carries information such as switching type, bearing configuration, terminal capability information, safety configuration and the like, and triggers the target base station to execute the terminal switching access;
step 203: an RRC module of the target base station sends a terminal switching access request message to a PDCP module, and requests the PDCP module to execute terminal switching access;
step 204: the PDCP module of the target base station sends a terminal switching access response message to the RRC module, and the PDCP module feeds back the switching access response to the RRC module after completing the terminal switching access;
step 205: the RRC module of the target base station acquires the group identification information of the cluster group where the terminal is located;
step 206: an RRC module of the target base station sends a multicast data stop request message to a PDCP module, and the PDCP module stops sending the multicast data;
step 207: the PDCP module of the target base station stops the multicast data of the cluster group where the terminal is positioned from being sent to the terminal, caches the received multicast data, and starts a multicast timer at the same time;
step 208: the PDCP module of the target base station sends a multicast data stop response message to the RRC module and feeds back a multicast data stop issuing result of the RRC module;
step 209: the target base station sends a switching request confirmation message to the core network, carries the information of the admitted bearing list, the target base station cell measurement configuration, the mobile configuration, the wireless bearing, the security algorithm and the like, and informs the core network target base station of completing the terminal switching admission process;
step 210: the core network sends a switching command message to the source base station and forwards the switching configuration information of the target base station to the terminal to the source base station;
step 211: a source base station sends an RRC connection reconfiguration message to a terminal, carries information such as a target base station cell identifier, frequency point configuration, measurement configuration, mobile configuration, radio bearer and the like, and triggers the terminal to execute an air interface switching process;
step 212: the target base station receives an RRC connection reconfiguration completion message from the terminal and determines that the terminal is successfully switched;
step 213: the target base station RRC module sends a multicast data recovery indication message to the PDCP module;
step 214: the PDCP module of the target base station recovers the multicast data processing of the cluster group where the terminal is located and stops the multicast timer at the same time;
step 215: the target base station sends a switching notification message to the core network to indicate that the switching is completed successfully.
Further, in step 205, the RRC radio resource control module of the destination base station identifies the group in which the terminal is located according to the group identifier carried in the handover request message.
Further, the sending time of the multicast data stop request message in step 206 is between step 204 and step 209. The delivery timing is earlier than step 204, which affects the multicast data receiving effect of the non-handover terminal in the group, and the delivery timing is later than step 209, which weakens the improving effect of the multicast data receiving of the handover terminal in the group.
Further, in step 207, the value of the multicast timer may be adjusted according to the multicast rate and the quality of the wireless channel, and in this example, the duration of the multicast timer is greater than 70ms (i.e., the time consumed by the air interface for terminal switching) and less than 200 ms.
Further, in step 207, if the multicast timer is overtime, the PDCP packet data convergence protocol module actively resumes the multicast data processing of the cluster group where the terminal is located, and this operation does not affect the normal reception of the multicast data of the non-handover terminal in the cluster group.
In the preparation stage of terminal switching, a target base station RRC module identifies a cluster group where a terminal is positioned, informs a PDCP module to stop multicast service data processing and caches received multicast data; and when the terminal successfully switches and admits the target base station, the RRC of the target base station informs the PDCP to recover the multicast data processing and sends the cached multicast data to the cluster group where the terminal is located. When the PDCP receives the indication of stopping sending the multicast data, the multicast timer is started, and if the multicast timer is overtime, the sending of the multicast data is resumed. The invention can discriminate the cluster multicast service terminal in the switching state in time, and avoid the problem of packet loss caused by the incapability of processing multicast data due to terminal switching for about 70ms through the cooperative processing of RRC and PDCP.
It should be noted that the above-mentioned embodiments are only specific examples of the present invention, and those skilled in the art will be able to change the embodiments and applications of the present invention based on the idea of the present invention, and the changes are within the scope of the present invention.
The patent is funded by a special project with great science and technology in Hebei province, and the project number is 19050410Z.
Claims (5)
1. A cluster multicast switching method of a B-trunk system is characterized by comprising the following steps:
step 1: a source base station sends a switching preparation request message to a core network, carries a source base station identifier, a switching type and destination base station identifier information, and requests the core network to execute the switching of a terminal;
step 2: the core network sends a switching request message to a target base station, carries a switching type, a bearing configuration, terminal capability information and safety configuration information, and triggers the target base station to execute the switching access of the terminal;
and step 3: an RRC (radio resource control) module of the target base station sends a terminal switching access request message to a PDCP (packet data convergence protocol) module to request the PDCP to execute terminal switching access;
and 4, step 4: a PDCP packet data convergence protocol module of the target base station sends a terminal switching access response message to an RRC wireless resource control module, and the PDCP packet data convergence protocol module feeds back the switching access response to the RRC wireless resource control module after completing the terminal switching access;
and 5: an RRC (radio resource control) module of a target base station acquires group identification information of a cluster group where a terminal is located;
step 6: an RRC (radio resource control) module of a target base station sends a multicast data stop request message to a PDCP (packet data convergence protocol) module, and the PDCP module stops sending multicast data;
and 7: a PDCP packet data convergence protocol module of a target base station stops sending the multicast data of the cluster group where the terminal is positioned to the terminal, caches the received multicast data and starts a multicast timer at the same time;
and 8: a PDCP packet data convergence protocol module of the target base station sends a multicast data stop response message to the RRC radio resource control module and feeds back a result of the RRC radio resource control module that the multicast data stop issuing;
and step 9: the target base station sends a switching request confirmation message to the core network, carries the admitted bearer list, target base station cell measurement configuration, mobile configuration, radio bearer and safety algorithm information and informs the base station of the core network to complete the terminal switching admission process;
step 10: the core network sends a switching command message to the source base station and forwards the switching configuration information of the target base station to the terminal to the source base station;
step 11: a source base station sends RRC radio resource control connection reconfiguration information to a terminal, carries a target base station cell identifier and frequency point configuration, measurement configuration, mobile configuration and radio bearer information, and triggers the terminal to execute an air interface switching process;
step 12: the target base station receives an RRC radio resource control connection reconfiguration completion message from the terminal and determines that the terminal is successfully switched;
step 13: the target base station RRC wireless resource control module sends a multicast data recovery indication message to the PDCP packet data convergence protocol module;
step 14: the PDCP packet data convergence protocol module of the target base station recovers the multicast data processing of the cluster group where the terminal is located and stops the multicast timer at the same time;
step 15: the target base station sends a switching notification message to the core network to indicate that the switching is completed successfully.
2. The method according to claim 1, wherein the RRC module of the target base station in step 5 identifies the group where the terminal is located according to the group identifier carried in the handover request message.
3. The method according to claim 1, wherein the sending of the multicast data stop request message in step 6 is between step 4 and step 9.
4. The method according to claim 1, wherein the duration of the multicast timer in step 7 is greater than 70ms and less than 200 ms.
5. The method according to claim 1, wherein in step 7, if the multicast timer expires, the PDCP packet data convergence protocol module actively resumes the multicast data processing of the cluster group where the terminal is located.
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Application publication date: 20201002 |