CN111756677B - Method for reconfiguring call parameters - Google Patents
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- CN111756677B CN111756677B CN201910248459.6A CN201910248459A CN111756677B CN 111756677 B CN111756677 B CN 111756677B CN 201910248459 A CN201910248459 A CN 201910248459A CN 111756677 B CN111756677 B CN 111756677B
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- H—ELECTRICITY
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- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
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- H04L65/1104—Session initiation protocol [SIP]
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- 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
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Abstract
The application discloses a method for reconfiguring call parameters, which is applied to a group calling process of trunking communication and comprises the following steps: the equipment initiating the speaking right preemption sends a speaking right preemption request message to the cluster core network, and the request message carries suggested new parameters; if the cluster core network agrees with the speaking right preemption, parameter negotiation is carried out, and a speaking right release flow is initiated to the original calling equipment; the cluster core network establishes a special bearing for the preemption equipment according to the new parameters, initiates a speaking right grant message to the preemption equipment, and sends the new parameters to the preemption equipment; the cluster core network carries out necessary modification on the group bearing of the called equipment according to the new parameters and sends the new parameters to all the called equipment; and all the devices participating in the group call process the data packet according to the new parameters. The invention also provides a call parameter reconfiguration method applied to the half-duplex single call process of cluster communication. By applying the technical scheme disclosed by the application, the reconfiguration of the call parameters can be realized in the process of preempting the right.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method for reconfiguring call parameters.
Background
In the current B-trunk protocol, a process of initiating speaking right preemption by a called terminal in a group call or half duplex single call process is specified. The specific flow is shown in fig. 1, and is described as follows:
referring to fig. 1, assume that during the current group call, UE2 occupies the speaking right, and UE1 initiates the speaking right preemption, and the speaking right preemption process includes the following steps:
step 1: the UE1 initiates a speaking right REQUEST and sends a message of 'FLOOR REQUEST' to the cluster core network, wherein the message carries: CALL ID, media description information, etc.
Step 2: the cluster core network initiates a speaking right releasing flow to the UE2 to release the speaking right of the UE 2.
Step 3: optionally, the trunking core network establishes a dedicated bearer for UE 1. If an existing dedicated bearer is available and the core network determines to use the existing dedicated bearer, the procedure need not be performed.
Step 4.1-4.2: the trunking core network sends a "FLOOR GRANT" message to UE1 via a downlink direct message.
Step 5.1-5.2: after receiving the FLOOR GRANT message, UE1 sends an uplink direct message "FLOOR GRANT ACK" message to the trunking core network.
Steps 6.a and 6.B: the trunking core network sends an S1 message (for group call, the S1 message is GROUP DOWNLINK NAS TRANSPORT message, for half duplex single call, the S1 message is DOWNLINK NAS TRANSPORT message) to the base stations (as shown, trunking base station a and trunking base station B, respectively, the base stations to which UE1 and UE2 belong), and the NAS message FLOOR info rm is carried in the S1 message.
Steps 7.a and 7.B: after receiving the S1 message, the base station (shown as a cluster base station A and a cluster base station B) respectively and transparently transmits the Floor information message to the corresponding UE through the DLTrunkingInformationtransfer message, and informs the monitoring UE of the current speaking right state of the group. Each base station may process this process in parallel.
Step 8: the cluster core network informs the dispatcher station of the speaking right occupation information through the SIP (INFO).
Step 9: the dispatcher station replies a SIP (200 OK) message to the trunking core network.
The inventor of the present application finds that, in the process of implementing the present application, the following technical problems mainly exist in the prior art:
technical problem 1,
The current protocol supports the group call preemption function (i.e., group call preemption function), but does not support modifying call parameters while preempting. For example: assuming that 1080P high definition is used for the current video group call and only 720P is supported by the calling terminal camera after the right is successfully robbed, the video format needs to be modified. However, modification of call parameters while preempting is not currently supported.
The call REQUEST message (FLOOR REQUEST) in fig. 1 may carry parameters related to the call of the terminal with the right, for example: audio media format, video media format. However, these call related parameters are not notified to the called terminal in the Floor notification message (Floor Inform). According to the current protocol, the called terminal is only informed of call related parameters by late entry, i.e. after a period of time, by a periodically sent group call setup indication message (GROUP CALL SETUP INDICATION). The transmission period of the message is in seconds, for example 2 seconds. Then the calling terminal uses the new parameters and the called terminal still uses the old parameters within the time from the success of the preemption to the issuance of the new parameters on the called side, which will result in the called terminal not being able to correctly decode the data packet sent by the calling terminal. Obvious consequences are speech word loss, video frame loss and even screen display.
Technical problem 2,
When call parameters change, it may be necessary to modify the bearer on the called side. The current protocol does not take this into account either, and no corresponding solution exists.
Technical problem 3,
When a new call parameter is set by the main call, not all called terminals may support, and at this time, a call abnormality or interruption of a part of the called terminals may be caused. For example: when the main speaker changes the conversation quality from low definition to high definition, a part of terminals in the group call cannot support the scene.
Disclosure of Invention
The application provides a method for reconfiguring call parameters, which is used for realizing the reconfiguration of the call parameters in the robbing process of trunked group calling or half-duplex single call.
The application discloses a method for reconfiguring call parameters, which is applied to a group calling process of trunking communication and comprises the following steps:
a1, a right preemption device initiating right preemption sends a right preemption request message to a cluster core network and carries suggested new parameters;
b1, if the cluster core network agrees with the speaking right preemption, carrying out parameter negotiation, and initiating a speaking right releasing flow to the original calling equipment;
the method comprises the steps that C1, a cluster core network establishes a special bearing for the preemption equipment according to negotiated new parameters, initiates a speaking right grant message to the preemption equipment, and sends the negotiated new parameters to the preemption equipment;
d1, the cluster core network judges whether to modify the group bearing for all called devices of the cluster communication according to the negotiated new parameters, and if so, the cluster core network modifies the group bearing of the called devices;
e1, the cluster core network sends the negotiated new parameters to all called devices through the group bearer;
and F1, processing the data packet by all the devices participating in the group call according to the negotiated new parameters.
Preferably, performing parameter negotiation includes: if all devices participating in the call support the new parameters suggested by the robbing device, the network uses the new parameters as the result of parameter negotiation; otherwise, the network selects new parameters, defaulting to parameters prior to use of the preemption.
Preferably, for the case that the device participating in the group call is a terminal, the D1 includes:
if the GROUP bearer needs to be modified, the trunking core network sends a trunking GROUP call radio access bearer modification request GROUP TE-RAB MODIFY REQUEST message to trunking base stations to which all called terminals belong, wherein the message carries a NAS message GROUP call establishment indication GROUP CALL SETUP INDICATION message or a speaking right notification message;
if the group bearer does not need to be modified, the trunking core network sends GROUP DOWNLINK NAS TRANSPORT a message to the trunking base station to which all the called terminals belong, wherein the message carries NAS message GROUP CALL SETUP INDICATION or a speaking right notification message.
Preferably, the D1 further includes:
if the access layer parameters need to be modified, each cluster base station respectively sends group configuration GroupCall Config information to all called terminals in the group call on a TCCH channel, gives out access layer configuration parameters of the group TTCH, and the group configuration information contains GROUP CALL SETUP INDICATION information or speaking right notification information, wherein the group configuration information carries complete call parameters;
if the access layer parameters do not need to be modified, each cluster base station respectively sends downlink direct-transmission messages to all called terminals in the group call, and the downlink direct-transmission messages contain GROUP CALL SETUP INDICATION messages or speaking right notification messages, wherein the downlink direct-transmission messages carry complete call parameters.
Preferably, the E1 includes:
the cluster core network sends a group calling downlink NAS transmission GROUP DOWNLINK NAS TRANSPORT message to each cluster base station, and carries an NAS message speaking right notification flow information message;
after each trunking base station receives the FLOOR INFORM message, the FLOOR INFORM message is transmitted to each called terminal in the group call through the DLTrunkingInformationtransfer message, and the current speaking right state of the group is notified to the called terminal;
the FLOOR information message includes at least audio description information and video description information.
Preferably, for the case that the devices participating in the group call are schedulers, the D1 and E1 include:
carrying out bearing modification and carrying new parameters by using SIP information, which comprises the following steps:
the cluster core network sends a Session Initiation Protocol (SIP) message to a called dispatching desk, wherein the message carries the negotiated new parameters;
the called dispatching desk sends a SIP (100 try) message to the cluster core network;
the called dispatching desk sends a SIP (200 OK) message to the cluster core network;
the trunking core network sends a return SIP (ACK) message to the called dispatch station.
The application also discloses a method for reconfiguring call parameters, which is applied to a half-duplex single call process of cluster communication and comprises the following steps:
a2, the preemption equipment initiating the preemption of the speaking right sends a request message of the preemption of the speaking right to the cluster core network and carries suggested new parameters;
b2, if the cluster core network agrees with the speaking right preemption, carrying out parameter negotiation, and initiating a speaking right releasing flow to the original calling equipment;
the cluster core network modifies the special bearing of the preemption equipment according to the negotiated new parameters, initiates a speaking right grant message to the preemption equipment, and sends the negotiated new parameters to the preemption equipment;
d2, the cluster core network modifies the special bearing of the original calling equipment according to the negotiated new parameters and sends the negotiated new parameters to the original calling equipment;
and E2, the new calling equipment and the called equipment process the data packet according to the negotiated new parameters.
Preferably, performing parameter negotiation includes: if the original calling device also supports the new parameters suggested by the robbing device, the network uses the new parameters as the result of parameter negotiation; otherwise, the network selects new parameters, defaulting to parameters prior to use of the preemption.
Preferably, for the case that the original calling device is a terminal, the D2 includes:
if the special bearer of the original calling equipment needs to be modified, the cluster core network sends a special bearer modification request message to a cluster base station to which the original calling equipment belongs, wherein the special bearer modification request message carries an NAS message speaking right notification message;
and if the special bearer of the original calling equipment does not need to be modified, the cluster core network sends GROUP DOWNLINK NAS TRANSPORT message to the cluster base station to which the original calling equipment belongs, wherein the message carries NAS message speaking right notification message.
Preferably, the D2 further includes:
if the access layer parameters need to be modified, the trunking base station sends group configuration GroupCall Config information to all called terminals in the group call on a TCCH channel, gives out access layer configuration parameters of a group TTCH, and the group call configuration information comprises the speaking right notification information, wherein the speaking right notification information carries complete call parameters;
if the access layer parameters do not need to be modified, each cluster base station respectively sends downlink direct-transmission messages to all called terminals in the group call, and the downlink direct-transmission messages contain the speaking right notification messages, wherein the speaking right notification messages carry complete call parameters.
Preferably, the D2 further includes:
the cluster core network sends a group calling downlink NAS transmission GROUP DOWNLINK NAS TRANSPORT message to the cluster base station, and carries an NAS message speaking right notification flow information message;
after receiving the FLOOR INFORM message, the cluster base station transmits the FLOOR INFORM message to the original calling terminal through the DLTrunkingInformationTransfermessage, and notifies the current speaking right state of the cluster to the original calling terminal;
the FLOOR information message includes at least audio description information and video description information.
Preferably, for the case that the original calling device is a dispatcher station, the D2 includes:
carrying out bearing modification and carrying new parameters by using SIP information, which comprises the following steps:
the cluster core network sends an SIP (Re-invite) message to the original calling dispatching desk, wherein the Re-invite message carries the negotiated new parameters;
the original calling dispatching desk sends a SIP (100 try) message to the cluster core network;
the original calling dispatching desk sends a SIP (200 OK) message to the cluster core network;
the trunking core network sends a return SIP (ACK) message to the original calling dispatching desk.
According to the technical scheme, the call parameter reconfiguration method provided by the application comprises the steps that the call weight preemption initiating device sends the suggested new parameters to the cluster core network in the call weight preemption request message, the cluster core network carries out parameter negotiation according to the supporting conditions of the new parameters by other devices participating in the cluster communication, then the cluster core network carries out necessary modification on the cluster bearing according to the negotiated new parameters, and finally the cluster core network informs all devices in the cluster of the negotiated new parameters, so that all devices in the cluster can carry out data packet processing based on the new parameters, call parameter reconfiguration is simultaneously realized in the call weight preemption flow, the efficiency of parameter reconfiguration is improved, the whole flow is shortened, and the problem of abnormal or interrupted call is avoided.
Drawings
Fig. 1 is a schematic flow diagram of a session preemption initiated by a conventional terminal;
fig. 2 is a schematic flow chart of preempting and modifying parameters of a speaking right initiated by a terminal in a group call according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of preempting and modifying parameters of a session initiated by a terminal in a three-half duplex single call according to an embodiment of the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings and examples.
In order to solve the problems existing in the prior art, the application provides a method for reconfiguring call parameters, which can be used for initiating speaking right preemption by a called device in the group call or half duplex single call process of trunking communication and modifying the parameters of the call, such as audio media parameters and video media parameters.
The call parameter reconfiguration method of the present invention is described below in terms of a trunking group call procedure and a half duplex single call procedure, respectively.
1. Call parameter reconfiguration method in cluster group calling process
The call parameter reconfiguration method applied to the group call process of the trunking communication comprises the following steps:
a1, a right preemption device initiating right preemption sends a right preemption request message to a cluster core network and carries suggested new parameters;
b1, if the cluster core network agrees with the speaking right preemption, carrying out parameter negotiation, and initiating a speaking right releasing flow to the original calling equipment;
the method comprises the steps that C1, a cluster core network establishes a special bearing for the preemption equipment according to negotiated new parameters, initiates a speaking right grant message to the preemption equipment, and sends the negotiated new parameters to the preemption equipment;
d1, the cluster core network judges whether to modify the group bearing for all called devices of the cluster communication according to the negotiated new parameters, and if so, the cluster core network modifies the group bearing of the called devices;
e1, the cluster core network sends the negotiated new parameters to all called devices through the group bearer;
and F1, processing the data packet by all the devices participating in the group call according to the negotiated new parameters.
In the above step B1, performing parameter negotiation includes: if all devices participating in the call support the new parameters suggested by the robbing device, the network uses the new parameters as the result of parameter negotiation; otherwise, the network selects new parameters, defaulting to parameters prior to use of the preemption.
The devices participating in the cluster group call may be terminals or scheduling stations. For a terminal, a cluster core network interacts with the terminal through a cluster base station to which the terminal belongs by using NAS information; for the dispatcher station, the cluster core network interacts with it using SIP messages. The two cases are described below.
For the case that the device participating in the group call is a terminal, the D1 includes:
if the GROUP bearer needs to be modified, the trunking core network sends a trunking GROUP call radio access bearer modification request GROUP TE-RAB MODIFY REQUEST message to trunking base stations to which all called terminals belong, wherein the message carries a NAS message GROUP call establishment indication GROUP CALL SETUP INDICATION message or a speaking right notification message;
if the group bearer does not need to be modified, the trunking core network sends GROUP DOWNLINK NAS TRANSPORT a message to the trunking base station to which all the called terminals belong, wherein the message carries NAS message GROUP CALL SETUP INDICATION or a speaking right notification message.
For the case that the device participating in the group call is a terminal, the D1 further includes:
if the access layer parameters need to be modified, each cluster base station respectively sends group configuration GroupCall Config information to all called terminals in the group call on a TCCH channel, gives out access layer configuration parameters of the group TTCH, and the group configuration information contains GROUP CALL SETUP INDICATION information or speaking right notification information, wherein the group configuration information carries complete call parameters;
if the access layer parameters do not need to be modified, each cluster base station respectively sends downlink direct-transmission messages to all called terminals in the group call, and the downlink direct-transmission messages contain GROUP CALL SETUP INDICATION messages or speaking right notification messages, wherein the downlink direct-transmission messages carry complete call parameters.
For the case that the equipment participating in the group call is a terminal, the E1 includes:
the cluster core network sends a group calling downlink NAS transmission GROUP DOWNLINK NAS TRANSPORT message to each cluster base station, and carries an NAS message speaking right notification flow information message;
after each trunking base station receives the FLOOR INFORM message, the FLOOR INFORM message is transmitted to each called terminal in the group call through the DLTrunkingInformationtransfer message, and the current speaking right state of the group is notified to the called terminal;
the FLOOR information message includes at least audio description information and video description information.
For the case that the devices participating in the group call are dispatch stations, the D1 and E1 include:
carrying out bearing modification and carrying new parameters by using SIP information, which comprises the following steps:
the cluster core network sends a Session Initiation Protocol (SIP) message to a called dispatching desk, wherein the message carries the negotiated new parameters;
the called dispatching desk sends a SIP (100 try) message to the cluster core network;
the called dispatching desk sends a SIP (200 OK) message to the cluster core network;
the trunking core network sends a return SIP (ACK) message to the called dispatch station.
Based on the above-mentioned method for reconfiguring call parameters in the cluster group call process, the following call parameter reconfiguration process in the cluster group call process will be described by taking the equipment participating in the group call as the terminal as an example:
step 1), a right preemption terminal initiating right preemption sends a right preemption request message to a network and carries suggested new parameters.
Step 2) if the network agrees to the speaking right preemption, further carrying out parameter negotiation. The method specifically comprises the following steps: if all terminals participating in the call support the new parameters suggested by the robbed terminal, the network uses the new parameters as the result of parameter negotiation; otherwise, the network selects new parameters, defaulting to call parameters before preemption.
And 3) the network initiates a speaking right release flow to the original calling terminal.
Step 4) the network establishes a special bearing for the robbery terminal according to the negotiated new parameters, and then initiates a speaking right grant message to the robbery terminal, wherein the message carries the negotiated new parameters.
And 5) at the same time, at the called side, the network modifies the group bearing for all the called terminals according to the negotiated new parameters. And then the network sends RRC layer information to all called terminals, carrying access layer parameters. The RRC layer may also use a direct transfer message if the bearer does not need to be modified.
Step 6) carrying the NAS message in the RRC layer message in the above step 5: the group call establishment indication message or the speaking right notification message carries the negotiated new parameters in the NAS message, such as: audio media parameters and video media parameters.
For the case that the equipment participating in the group call is a dispatching desk, the NAS message is replaced by a corresponding SIP message, for example, a Re-invite message is used for carrying new parameters.
And 7) processing the data packet by all the terminals and the dispatching desk participating in the group call according to the new parameters.
2. Call parameter reconfiguration method in cluster half-duplex single call process
The call parameter reconfiguration method applied to the half-duplex single call process of the trunking communication comprises the following steps:
a2, the preemption equipment initiating the preemption of the speaking right sends a request message of the preemption of the speaking right to the cluster core network and carries suggested new parameters;
b2, if the cluster core network agrees with the speaking right preemption, carrying out parameter negotiation, and initiating a speaking right releasing flow to the original calling equipment;
the cluster core network modifies the special bearing of the preemption equipment according to the negotiated new parameters, initiates a speaking right grant message to the preemption equipment, and sends the negotiated new parameters to the preemption equipment;
d2, the cluster core network modifies the special bearing of the original calling equipment according to the negotiated new parameters and sends the negotiated new parameters to the original calling equipment;
and E2, the new calling equipment and the called equipment process the data packet according to the negotiated new parameters.
In the above step B2, performing parameter negotiation includes: if the original calling device also supports the new parameters suggested by the robbing device, the network uses the new parameters as the result of parameter negotiation; otherwise, the network selects new parameters, defaulting to parameters prior to use of the preemption.
As mentioned above, the device participating in the trunked half duplex call may be a terminal or a dispatcher. For a terminal, a cluster core network interacts with the terminal through a cluster base station to which the terminal belongs by using NAS information; for the dispatcher station, the cluster core network interacts with it using SIP messages. The two cases are described below.
For the case that the original calling device is a terminal, the D2 includes:
if the special bearer of the original calling equipment needs to be modified, the cluster core network sends a special bearer modification request message to a cluster base station to which the original calling equipment belongs, wherein the special bearer modification request message carries an NAS message speaking right notification message;
and if the special bearer of the original calling equipment does not need to be modified, the cluster core network sends GROUP DOWNLINK NAS TRANSPORT message to the cluster base station to which the original calling equipment belongs, wherein the message carries NAS message speaking right notification message.
For the case that the original calling device is a terminal, the D2 further includes:
if the access layer parameters need to be modified, the trunking base station sends group configuration GroupCall Config information to all called terminals in the group call on a TCCH channel, gives out access layer configuration parameters of a group TTCH, and the group call configuration information comprises the speaking right notification information, wherein the speaking right notification information carries complete call parameters;
if the access layer parameters do not need to be modified, each cluster base station respectively sends downlink direct-transmission messages to all called terminals in the group call, and the downlink direct-transmission messages contain the speaking right notification messages, wherein the speaking right notification messages carry complete call parameters.
For the case that the original calling device is a terminal, the D2 further includes:
the cluster core network sends a group calling downlink NAS transmission GROUP DOWNLINK NAS TRANSPORT message to the cluster base station, and carries an NAS message speaking right notification flow information message;
after receiving the FLOOR INFORM message, the cluster base station transmits the FLOOR INFORM message to the original calling terminal through the DLTrunkingInformationTransfermessage, and notifies the current speaking right state of the cluster to the original calling terminal;
the FLOOR information message includes at least audio description information and video description information.
For the case that the original calling device is a dispatch table, the D2 includes:
carrying out bearing modification and carrying new parameters by using SIP information, which comprises the following steps:
the cluster core network sends an SIP (Re-invite) message to the original calling dispatching desk, wherein the Re-invite message carries the negotiated new parameters;
the original calling dispatching desk sends a SIP (100 try) message to the cluster core network;
the original calling dispatching desk sends a SIP (200 OK) message to the cluster core network;
the trunking core network sends a return SIP (ACK) message to the original calling dispatching desk.
Based on the above method for reconfiguring call parameters in the trunking half duplex single call process, which is provided by the present invention, the device participating in the half duplex single call is taken as an example of a terminal, and the call parameter reconfiguration process in the trunking half duplex single call process is described as follows:
step 1), a right preemption terminal initiating right preemption sends a right preemption request message to a network and carries suggested new parameters.
Step 2) if the network agrees to the speaking right preemption, further carrying out parameter negotiation. The method specifically comprises the following steps: if the original calling terminal also supports the new parameters suggested by the robbing terminal, the network uses the new parameters as the result of parameter negotiation; otherwise, the network selects new parameters, defaulting to call parameters before preemption.
And 3) the network initiates a speaking right release flow to the original calling terminal.
Step 4) the network modifies the special bearing for the robbery terminal according to the negotiated new parameters, and then initiates a speaking right grant message to the robbery terminal, wherein the message carries the negotiated new parameters.
And 5) at the same time, at the original calling terminal side, the network modifies the special bearing according to the negotiated new parameters, and then the network uses the speaking right notification message to carry the new parameters and send the new parameters to the source calling terminal.
For the case that the calling terminal or the called terminal is a dispatcher station, the NAS message is replaced by a corresponding SIP message, for example, a Re-invite message is used to carry new parameters.
And 6) the terminal and the dispatching desk participating in the half duplex single call process the data packet according to the new parameters.
Embodiment one:
the embodiment describes a flow of initiating speaking right preemption and modifying parameters by a terminal in group call.
Fig. 2 is a schematic flow chart of preemption of a talk right initiated by a terminal and modification of parameters in a group call according to an embodiment, in which UE1 is a terminal initiating preemption, UE2 is an original calling terminal, and UE2 becomes a member of a called terminal in the group call after the talk right is released. The flow shown in fig. 2 is described as follows:
step 1: UE1 initiates a speaking right REQUEST, and sends a FLOOR REQUEST message to the trunking core network, carrying new call parameters.
Step 2: if the network agrees with the speaking right preemption, the network further carries out parameter negotiation: if all terminals in the group support the new parameters suggested by the robbed terminal, the network uses the new parameters as the result of parameter negotiation; otherwise, the network selects parameters, defaulting to call parameters before preemption.
Step 3: the cluster core network initiates a speaking right releasing flow to the UE2 to release the speaking right of the UE 2.
Step 4a: the trunking core network establishes a dedicated bearer for UE 1.
Steps 7a-8a: after receiving the message, UE1 sends an uplink direct message "flow GRANT ACK" message to the trunking core network.
Step 4b: if the load needs to be modified, the trunking core network sends a trunking GROUP call wireless access load modification request (GROUP TE-RAB MODIFY REQUEST) message to trunking base stations to which all called terminals belong in the GROUP call, carrying NAS message GROUP CALL SETUP INDICATION; if the bearer does not need modification, the trunked core network sends GROUP DOWNLINK NAS TRANSPORT a message to the trunked base station carrying NAS message GROUP CALL SETUP INDICATION.
Step 5b: if the access layer parameters need to be modified, each cluster base station sends group call configuration (GroupCallConfig) information to all called terminals in the group call on the TCCH channel, and gives the access layer configuration parameters of the TTCH of the group; if the access layer parameters do not need to be modified, each cluster base station sends downlink direct transmission messages to all called terminals in the group call. Regardless of which RRC message is used, the message needs to include a NAS message group call setup indication (GROUP CALL SETUP INDICATION) that carries the complete call parameters, such as: audio Description and Video Description.
Step 6b: if in step 4a, the trunking core network sends a GROUP TE-RAB MODIFY REQUEST message to each trunking base station, in this step, each trunking base station returns a GROUP TE-RAB MODIFY RESPONSE message to the trunking core network. So far, the session media change flow of the called side is completed.
Step 4c-7c: when a dispatching desk exists in the called party, the cluster core network changes session parameters through the Re-invite process of the SIP protocol, and specifically comprises the following steps:
Steps 9a-9b: the trunking core network sends group call downlink NAS transport (GROUP DOWNLINK NAS TRANSPORT) messages to each trunking base station, carrying NAS message flow info rm.
Steps 10a-10b: after each cluster base station receives the flow information message, the flow information message is transmitted to each UE in the group call through the DLTrunkingInformationTransfermessage, and the current speaking right state of the group is notified to the monitoring UE. Each clustered base station may perform this process in parallel.
Embodiment two:
the present embodiment is the same as the first embodiment in most of the flow paths, except that: the NAS message group call setup indication message in step 4b and step 5b of the first embodiment is replaced with a speaking right notification message, and call related parameters are added into the speaking right notification message.
The first and second embodiments can be adopted for the robbery in the group call, and the second embodiment can be adopted only for the robbery in the half duplex point call process.
The specific FLOOR notification (FLOOR notification) message design is shown in table 1:
table 1 FLOOR information message content
The audio description information (Audio Description) and the video description information (Video Description) in table 1 are newly added contents of the present embodiment.
Embodiment III:
the embodiment describes a process of initiating speaking right preemption and modifying parameters by a terminal in a half-duplex single call.
Fig. 3 is a schematic flow chart of preemption of a talk right initiated by a terminal in a three-half duplex single call and modification of parameters, in which UE1 is the terminal initiating the preemption and UE2 is the original talkback terminal. The flow shown in fig. 3 is described as follows:
step 1: UE1 initiates a speaking right REQUEST, and sends a FLOOR REQUEST message to the trunking core network, carrying new call parameters.
Step 2: if the network agrees with the speaking right preemption, the network further carries out parameter negotiation: if all terminals support the new parameters suggested by the robbed terminal, the network uses the parameters as the result of parameter negotiation; otherwise, the network selects parameters, defaulting to call parameters before preemption.
Step 3: the cluster core network initiates a speaking right releasing flow to the UE2 to release the speaking right of the UE 2.
Step 4a: the trunking core network modifies the dedicated bearer for UE 1.
Step 4b: the trunking core network modifies the dedicated bearer for UE 2.
Step 5-6: the cluster core network sends a FLOOR GRANT message to the UE1 through a downlink direct message; wherein the "FLOOR GRANT" message carries the negotiated new parameters.
Step 7-8: after receiving the message, UE1 sends an uplink direct message "flow GRANT ACK" message to the trunking core network.
Step 9: the trunking core network sends GROUP DOWNLINK NAS TRANSPORT a message to trunking base station B to which UE2 belongs, carrying the NAS message FLOOR info rm.
Step 10: after receiving the NAS message, the cluster base station B transparently transmits the Floor information to the UE2 through a DLTrunkingInformationTransfermessage, and informs the monitoring UE2 of the current speaking right state of the cluster.
In this embodiment, the design of the Floor information message can be seen from embodiment two.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for reconfiguring call parameters, applied to a group call process of trunking communication, comprising:
a1, a right preemption device initiating right preemption sends a right preemption request message to a cluster core network and carries suggested new parameters;
b1, if the cluster core network agrees with the speaking right preemption, carrying out parameter negotiation, and initiating a speaking right releasing flow to the original calling equipment;
the method comprises the steps that C1, a cluster core network establishes a special bearing for the preemption equipment according to negotiated new parameters, initiates a speaking right grant message to the preemption equipment, and sends the negotiated new parameters to the preemption equipment;
d1, the cluster core network judges whether to modify the group bearing for all called devices of the cluster communication according to the negotiated new parameters, and if so, the cluster core network modifies the group bearing of the called devices;
e1, the cluster core network sends the negotiated new parameters to all called devices through the group bearer;
f1, all the devices participating in the group call process the data packet according to the negotiated new parameters;
wherein, for the case that the device participating in the group call is a terminal, the D1 includes:
if the GROUP bearer needs to be modified, the trunking core network sends a trunking GROUP call radio access bearer modification request GROUP TE-RAB MODIFY REQUEST message to trunking base stations to which all called terminals belong, wherein the message carries a NAS message GROUP call establishment indication GROUP CALL SETUP INDICATION message or a speaking right notification message;
if the group bearer does not need to be modified, the trunking core network sends GROUP DOWNLINK NAS TRANSPORT messages to trunking base stations to which all called terminals belong, wherein the trunking base stations carry NAS messages GROUP CALL SETUP INDICATION or speaking right notification messages;
the E1 comprises:
the cluster core network sends a group calling downlink NAS transmission GROUP DOWNLINK NAS TRANSPORT message to each cluster base station, and carries an NAS message speaking right notification flow information message;
after each trunking base station receives the FLOOR INFORM message, the FLOOR INFORM message is transmitted to each called terminal in the group call through the DLTrunkingInformationtransfer message, and the current speaking right state of the group is notified to the called terminal;
the FLOOR information message includes at least audio description information and video description information.
2. The method according to claim 1, characterized in that:
the parameter negotiation includes: if all devices participating in the call support the new parameters suggested by the robbing device, the network uses the new parameters as the result of parameter negotiation; otherwise, the network selects new parameters, defaulting to parameters prior to use of the preemption.
3. The method of claim 1, wherein D1 further comprises:
if the access layer parameters need to be modified, each cluster base station respectively sends group configuration GroupCall Config information to all called terminals in the group call on a TCCH channel, gives out access layer configuration parameters of the group TTCH, and the group configuration information contains GROUP CALL SETUP INDICATION information or speaking right notification information, wherein the group configuration information carries complete call parameters;
if the access layer parameters do not need to be modified, each cluster base station respectively sends downlink direct-transmission messages to all called terminals in the group call, and the downlink direct-transmission messages contain GROUP CALL SETUP INDICATION messages or speaking right notification messages, wherein the downlink direct-transmission messages carry complete call parameters.
4. The method of claim 1, wherein for the case where the devices participating in the group call are schedulers, the D1 and E1 comprise:
carrying out bearing modification and carrying new parameters by using SIP information, which comprises the following steps:
the cluster core network sends a Session Initiation Protocol (SIP) message to a called dispatching desk, wherein the message carries the negotiated new parameters;
the called dispatching desk sends a SIP (100 try) message to the cluster core network;
the called dispatching desk sends a SIP (200 OK) message to the cluster core network;
the trunking core network sends a return SIP (ACK) message to the called dispatch station.
5. A method for reconfiguring call parameters, applied to a half duplex single call process of trunking communication, comprising:
a2, the preemption equipment initiating the preemption of the speaking right sends a request message of the preemption of the speaking right to the cluster core network and carries suggested new parameters;
b2, if the cluster core network agrees with the speaking right preemption, carrying out parameter negotiation, and initiating a speaking right releasing flow to the original calling equipment;
the cluster core network modifies the special bearing of the preemption equipment according to the negotiated new parameters, initiates a speaking right grant message to the preemption equipment, and sends the negotiated new parameters to the preemption equipment;
d2, the cluster core network modifies the special bearing of the original calling equipment according to the negotiated new parameters and sends the negotiated new parameters to the original calling equipment;
e2, the new calling device and the called device process the data packet according to the negotiated new parameters;
wherein, for the case that the original calling device is a terminal, the D2 includes:
if the special bearer of the original calling equipment needs to be modified, the cluster core network sends a special bearer modification request message to a cluster base station to which the original calling equipment belongs, wherein the special bearer modification request message carries an NAS message speaking right notification message;
if the special bearer of the original calling equipment does not need to be modified, the cluster core network sends GROUP DOWNLINK NAS TRANSPORT message to the cluster base station to which the original calling equipment belongs, wherein the message carries NAS message speaking right notification message;
the D2 further includes:
the cluster core network sends a group calling downlink NAS transmission GROUP DOWNLINK NAS TRANSPORT message to the cluster base station, and carries an NAS message speaking right notification flow information message;
after receiving the FLOR INFORM message, the cluster base station transmits the FLOR INFORM message to the original calling equipment through the DLTrunkingInformationtransfer message, and notifies the original calling equipment of the current speaking right state of the cluster;
the FLOOR information message includes at least audio description information and video description information.
6. The method according to claim 5, wherein:
the parameter negotiation includes: if the original calling device also supports the new parameters suggested by the robbing device, the network uses the new parameters as the result of parameter negotiation; otherwise, the network selects new parameters, defaulting to parameters prior to use of the preemption.
7. The method of claim 5, wherein D2 further comprises:
if the access layer parameters need to be modified, the trunking base station sends group configuration GroupCall Config information to all called terminals in the group call on a TCCH channel, gives out access layer configuration parameters of a group TTCH, and the group call configuration information comprises the speaking right notification information, wherein the speaking right notification information carries complete call parameters;
if the access layer parameters do not need to be modified, each cluster base station respectively sends downlink direct-transmission messages to all called terminals in the group call, and the downlink direct-transmission messages contain the speaking right notification messages, wherein the speaking right notification messages carry complete call parameters.
8. The method of claim 5, wherein for the case where the original originating device is a dispatch station, the D2 comprises:
carrying out bearing modification and carrying new parameters by using SIP information, which comprises the following steps:
the cluster core network sends an SIP (Re-invite) message to the original calling dispatching desk, wherein the Re-invite message carries the negotiated new parameters;
the original calling dispatching desk sends a SIP (100 try) message to the cluster core network;
the original calling dispatching desk sends a SIP (200 OK) message to the cluster core network;
the trunking core network sends a return SIP (ACK) message to the original calling dispatching desk.
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