CN109218997B

CN109218997B - Method and device for processing cluster call

Info

Publication number: CN109218997B
Application number: CN201710538896.2A
Authority: CN
Inventors: 喻敬海; 高陈强; 曹敏
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-07-04
Filing date: 2017-07-04
Publication date: 2021-08-24
Anticipated expiration: 2037-07-04
Also published as: CN109218997A

Abstract

A method for processing cluster call, the MCPTT server triggers the cluster call to obtain the base station or cell information corresponding to the cluster members; the MCPTT server explicitly copies the BIER forwarding information of the bit index and sends the BIER forwarding information to a relevant base station or cell; and the MCPTT server informs the source terminal of sending the cluster call message. An apparatus for group call processing. The scheme can reduce the waste of flow. Meanwhile, the BIER network distinguishes an ingress node and an egress node, the flow sent by the source cannot be returned to the source, and an evasion mechanism does not need to be added.

Description

Method and device for processing cluster call

Technical Field

The present invention relates To the field of communications, and in particular, To a method and an apparatus for processing a trunking call applied To a Push-To-Talk (MCPTT) Critical task.

Background

Currently, 3GPP (The 3rd Generation Partnership Project) defines MCPTT (radio transmit To Talk, abbreviated as MCPTT) series standards based on LTE (Long Term Evolution), wherein Multicast MBMS (Multimedia Broadcast/Multicast Service) based Group Communication Service (GCS) requires support of Multicast technology.

Fig. 1 is an architecture diagram of MCPTT, fig. 2 is an architecture diagram of GC (Group Communication), and fig. 3 is a traffic model of GC.

As can be seen from the above three figures, during MCPTT communication, multicast or broadcast traffic provides a data channel through the multicast and broadcast capabilities of MBMS, wherein the bearer layer uses the conventional ip multicast mode.

Bit Indexed Explicit Replication (BIER) is a multicast data forwarding technology, nodes at the edge of a network are all represented by only one Bit, multicast traffic is transmitted in an intermediate network, a specific BIER header is additionally encapsulated, the header marks all destination nodes of the multicast stream in the form of a Bit string, and the intermediate network forwarding node performs routing according to the Bit string to ensure that the traffic can be sent to all destination nodes. The Intermediate node Forwarding device floods and sends node information in advance through an internal Protocol, such as an OSPF (Open Shortest Path First) Protocol, an ISIS (Intermediate System-to-Intermediate System) Protocol, a BGP (Border Gateway Protocol) Protocol, or a Babel (sequential distance vector routing Protocol) Protocol in a three-layer network, to form a Bit Index Forwarding Table (Bit Index Forwarding Table) for guiding Forwarding of the BIER, and completes Forwarding of a packet to a destination node according to the Bit when receiving a traffic encapsulating a BIER header. The BIER data plane forwarding technology eliminates the time delay of multicast tree establishment because of no problem of multicast tree establishment, and compared with the original multicast tree reconstruction, the convergence speed of the BIER data plane forwarding technology is the same as that of OSPF and ISIS protocols, the convergence speed of the BIER data plane forwarding technology is greatly reduced.

Fig. 4 is an example of a flow of cluster communication, fig. 5 is a corresponding timing diagram, and the basic steps are as follows:

step 1, a plurality of UEs (User Equipment) notify an MCPTT server (or GCS AS (Application server)) through signaling to join a certain trunking communication group.

And 2, the MCPTT server (or GCS AS) generates cluster ID, MCPTT group ID (MCPTT group identification), the MCPTT ID (MCPTT user equipment identification) and MC ID (mission critical user equipment identification) of the UE and other parameters for controlling the cluster.

And 3, the MCPTT server distributes by itself, or acquires a Multicast IP address through a Broadcast/Multicast Service center (BM-SC), associates the Multicast IP address with the cluster ID and informs the UE of relevant parameters.

And step 4, when a group member initiates a cluster call, sending a call notification to the MCPTT server.

And step 5, the MCPTT server triggers the cluster call and simultaneously informs the BM-SC to establish the multicast call, and the BM-SC designates the MBMS-GW as the DR of the multicast and initiates the MBMS call.

Step 6, the eNB/Cell receiving the MBMS call acknowledgement initiates an IGMP (Internet Group Management Protocol) join message, thereby triggering the establishment of a multicast channel of the IP layer (or a pre-configured and pre-established multicast tree).

And step 7, the source UE sends the flow to the MCPTT server through unicast.

And step 8, the MCPTT server sends the flow to the BM-SC, and the BM-SC sends the flow to the MBMS-GW.

And step 9, the MBMS-GW sends the flow to the eNB/Cell connected with the UE through multicast.

And step 10, the eNB/Cell sends the traffic to the UEs in the group through a wireless channel.

In this mechanism, there are several problems:

AS can be seen from fig. 3 and 4, MBMS is a unidirectional channel, and the source UE needs to send information to the MCPTT server (or GCS AS) in a unicast manner, and then send the information to the group members in a reverse direction through the multicast tree by the MCPTT server, which is a long traffic process and is a great waste.

The source UE may also receive the information sent by itself through multicast, and in order to avoid interference, another evasion mechanism (such as transmit-receive frequency separation and frequency filtering circuit) is required.

When the UE moves, the multicast tree needs to be frequently reconstructed, which increases the burden of IP multicast, and meanwhile, packet loss is more.

Disclosure of Invention

The embodiment of the invention provides a method and a device for processing a cluster call, which aim to reduce the waste of flow.

A method of group call processing, comprising:

a key task push-to-talk MCPTT server triggers a cluster call to acquire base station or cell information corresponding to cluster members;

the MCPTT server explicitly copies the BIER forwarding information of the bit index and sends the BIER forwarding information to a relevant base station or cell;

and the MCPTT server informs the source terminal of sending the cluster call message.

Optionally, the MCPTT server obtaining the cluster base station or cell information is implemented by:

the MCPTT server obtains the base station or cell information corresponding to all the members of the cluster from the received signaling information, or

And the MCPTT server acquires the information of the base stations or the cells corresponding to all cluster members in the cluster where the source terminal is located from the core network.

Optionally, the MCPTT server explicitly copies the bit index into the BIER forwarding information and sends the BIER forwarding information to the relevant base station or cell, including:

the MCPTT server judges whether the BIER forwarding information is issued before, if not, the MCPTT server sends the BIER forwarding information to a related base station or cell, if so, the MCPTT server judges whether the issued BIER forwarding information of the cluster members changes, and if so, the MCPTT server sends the BIER forwarding information to the related base station or cell.

the MCPTT server sends the BIER forwarding information to a base station or a cell corresponding to the source terminal, or

And the MCPTT server sends the BIER forwarding information to base stations or cells corresponding to all cluster members.

Optionally, the MCPTT server sends the bit index explicit duplicate BIER forwarding information to the relevant base station or cell by extending any one of the following signaling protocols:

session initiation protocol, session description protocol, session announcement protocol, diameter protocol.

Optionally, the BIER forwarding information includes ingress node information of the BIER and egress node information of the BIER.

Optionally, the step of the MCPTT server notifying the source terminal to send the group call packet includes:

the MCPTT server judges whether the cluster members move or not, if not, the MCPTT server informs the source terminal to send cluster calling messages, and if the MCPTT server moves, the MCPTT server reacquires the base station or cell information of the cluster members.

An MCPTT server, comprising:

the acquisition module is used for triggering the cluster call and acquiring the information of the base station or the cell corresponding to the cluster member;

the sending module is used for sending the bit index explicit copied BIER forwarding information to a relevant base station or cell;

and the processing module is used for informing the source terminal of sending the cluster call message.

Optionally, the obtaining module obtains the information of the cluster base station or the cell by the following steps: and acquiring the information of the base stations or the cells corresponding to all the members of the cluster from the received signaling information, or acquiring the information of the base stations or the cells corresponding to all the members of the cluster in which the source terminal is located from the core network.

Optionally, the sending module sends the bit index explicit duplicate BIER forwarding information to the relevant base station or cell, including: and judging whether the BIER forwarding information is issued before, if not, sending the BIER forwarding information to a related base station or cell, if so, judging whether the issued BIER forwarding information is changed, and if so, sending the BIER forwarding information to the related base station or cell.

Optionally, the sending module sends the bit index explicit duplicate BIER forwarding information to the relevant base station or cell, including: and sending the BIER forwarding information to a base station or a cell corresponding to a source terminal, or sending the BIER forwarding information to base stations or cells corresponding to all cluster members, wherein the BIER forwarding information comprises the entry node information of the BIER and the exit node information of the BIER.

Optionally, the sending module sends the bit index explicit duplicate BIER forwarding information to the relevant base station or cell by extending any one of the following signaling protocols: session initiation protocol, session description protocol, session announcement protocol, diameter protocol.

Optionally, the notifying, by the processing module, that the source terminal sends the group call packet includes: and judging whether the cluster member moves, if not, informing the source terminal that the message can be sent, and if so, informing the acquisition module to acquire the information of the base station or the cell of the cluster member again.

An MCPTT server, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of:

triggering a cluster call to acquire base station or cell information corresponding to cluster members;

the bit index explicit copy BIER forwarding information is sent to a relevant base station or cell;

and informing the source terminal to send the cluster call message.

A method of group call processing, comprising:

after a cluster call message of a terminal is received, explicitly copying BIER forwarding information according to a pre-received in-place index to encapsulate the cluster call message;

and forwarding the encapsulated cluster call message through the BIER network.

Optionally, the BIER forwarding information includes ingress node information of the BIER and/or egress node information of the BIER.

An apparatus for group call processing, comprising:

the encapsulation module is used for explicitly copying BIER forwarding information according to the index which is received in advance and encapsulating the cluster call message after receiving the cluster call message of the terminal;

and the forwarding module is used for forwarding the encapsulated cluster call message through the BIER network.

A method of group call processing, comprising:

after receiving a cluster calling message, removing a bit index explicit copy BIER header in the cluster calling message;

and sending the cluster call message to cluster members through a wireless channel.

An apparatus for group call processing, comprising:

the processing module is used for removing the bit index explicit copy BIER head in the cluster calling message after receiving the cluster calling message;

and the sending module is used for sending the cluster call message to the cluster members through a wireless channel.

To sum up, embodiments of the present invention provide a method and an apparatus for processing a trunking call, which can reduce waste of traffic. Meanwhile, the BIER network distinguishes an ingress node and an egress node, the flow sent by the source cannot be returned to the source, and an evasion mechanism does not need to be added. In addition, the mobility of the user is well supported, and when the UE moves, the multicast tree does not need to be frequently reconstructed, so that the construction time of the multicast tree is eliminated, and the packet loss is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a simplified architecture diagram of a related art MCPTT;

FIG. 2 is an architecture diagram of a related art GC;

FIG. 3 is a schematic view of a flow model of a related art GC;

FIG. 4 is a flow forwarding diagram of a conventional network multicast tree;

fig. 5 is a timing diagram of a conventional network MCPTT;

fig. 6 is a flowchart of a method for processing a group call according to a first embodiment of the present invention;

fig. 7 is a timing diagram of a method for processing a group call according to a second embodiment of the present invention;

fig. 8 is a flowchart of a method for processing a group call according to a third embodiment of the present invention;

FIG. 9 is a schematic diagram of flow forwarding with the combination of MCPTT and BIER technologies according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of information format encoding according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of information format encoding according to an embodiment of the present invention;

fig. 12 is a flowchart of a method for processing a group call according to a fourth embodiment of the present invention;

fig. 13 is a flowchart of a method for processing a group call according to a fifth embodiment of the present invention;

fig. 14 is a flowchart of a method for processing a group call according to a sixth embodiment of the present invention;

fig. 15 is a flowchart of a method for processing a group call according to a seventh embodiment of the present invention;

fig. 16 is a schematic diagram of an MCPTT server according to an eighth embodiment of the present invention;

fig. 17 is a schematic diagram of a device for processing a group call according to a ninth embodiment of the present invention;

fig. 18 is a schematic diagram of a device for processing a group call according to a tenth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The embodiment of the invention provides a method for applying the BIER technology to the MCPTT, the BIER technology replaces the traditional IP multicast technology and interacts with wireless related network elements, the MCPTT service can be better supported, the problems are completely solved, and the better network robustness is provided.

Example one

Fig. 6 is a flowchart of a method for processing a group call according to an embodiment of the present invention, and as shown in fig. 6, the method according to the embodiment includes:

step 11, the MCPTT server triggers a cluster call to acquire information of a base station or a Cell (eNB/Cell) corresponding to a cluster member;

step 12, the MCPTT server copies the bit index explicit type BIER forwarding information to a relevant base station or cell;

and step 13, the MCPTT server informs the source terminal of sending the cluster call message.

The embodiment of the invention brings the eNB/Cell into a forwarding domain of the BIER, and the eNB/Cell is taken as an edge forwarding unit and is responsible for forwarding the multicast traffic together with a wired bearing layer. The method includes acquiring an eNB/Cell associated with a trunking user by combining trunking signaling and signaling extension of a core network, allocating or configuring BIER information for the eNB/Cell, and then issuing BFRs (Bit-Forwarding routers) s (including BFERs (Bit-Forwarding Egress routers) or BFERs + BFIRs (Bit-Forwarding Ingress routers)) associated with traffic when the traffic needs to be forwarded, and then taking the eNB/Cell connected with a source UE as the BFIRs to perform BIER encapsulation on the traffic, and then Forwarding the traffic to corresponding BFERs under a BIER Forwarding rule. For detailed information see the description that follows.

Example two

The timing diagram of the embodiment of the invention is shown in fig. 7, which describes the timing sequence steps of the combination of the MCPTT and BIER technologies, and the specific timing sequence steps are as follows:

step 101, a plurality of UEs notify the MCPTT server through signaling to form a cluster communication group.

Step 102, the MCPTT server generates a cluster ID, and parameters of a control cluster such as the MCPTT ID and the MC ID of the UE.

Step 103, the MCPTT server distributes by itself, or acquires the multicast IP address through the BM-SC, associates the multicast IP address with the cluster ID and informs the UE of relevant parameters.

And step 104, when a group member initiates a group call, sending a call notification to the MCPTT server.

And step 105, the MCPTT server triggers the cluster call, and simultaneously acquires cluster eNB/Cell information from the reserved signaling information or acquires the cluster eNB/Cell information from a CN core network.

And step 106, the MCPTT server sends the ingress node BFIR-id and/or the egress node BFER-id of the BIER to the eNB/Cell of the request member or to the eNBs/cells of all cluster members through an MB2-C/SGi interface. Or the MCPTT server sends the related information (the node-entering BFIR-id and/or the node-exiting BFER-id) to the related network element of the Core Network (CN), and the core network sends the related information to the related eNB/Cell. If the group member is not changed, the group member is not issued, otherwise, the group member is issued again.

And step 107, the source UE sends the message to the corresponding eNB/Cell, and the eNB/Cell performs BIER head encapsulation on the message through the previously issued BIER forwarding information.

And step 108, the BIER network forwards the message to a target receiving end eNB/Cell.

And step 109, the eNB/Cell removes the BIER header in the message and sends the message to the UEs in the group through a wireless channel.

EXAMPLE III

Fig. 8 is a flowchart of a method for processing a group call according to an embodiment of the present invention, which includes the following steps:

step 201: a plurality of UE applies for cluster communication to the MCPTT server through signaling;

step 202: the MCPTT server generates a cluster ID, and parameters of a control cluster such as the MCPTT ID and the MC ID of the UE;

step 203: the MCPTT server distributes by itself, or acquires a multicast IP address through the BM-SC, associates the multicast IP address with the cluster ID and sends the related parameters to the UE;

step 204: the cluster source UE sends a call notification to the MCPTT server;

step 205: the MCPTT server triggers a cluster call and acquires cluster eNB/Cell information at the same time;

step 206: judging whether BFIR-id and BFER-id are transmitted to the eNB/Cell in a designated mode or not; if yes, go to step 207; otherwise, go to step 216;

step 207: judging whether the issued BFIR-id and BFER-id information is issued before; if yes, go to step 208; otherwise, go to step 209;

step 208: judging whether the BFIR-id and the BFER-id of the issued cluster member are changed; if yes, go to step 209; otherwise, go to step 210;

step 209: the MCPTT server sends BIER forwarding information to an eNB/Cell of the source UE;

step 210: judging whether the member UE moves, if not, continuing the processing, and turning to step 211; otherwise, go to step 205;

when a member moves out of the original eNB/Cell, the newly accessed eNB/Cell needs to be acquired again.

Step 211: the source UE sends the message to a corresponding eNB/Cell;

step 212: the eNB/Cell performs BIER head encapsulation on the message through the previously issued BIER forwarding information;

step 213: the BIER network forwards the message to a target receiving end eNB/Cell.

Step 214: the eNB/Cell removes the BIER header in the message and sends the message to the UEs in the group through a wireless channel

Step 215: and finishing the forwarding processing of the cluster communication message.

Step 216: judging whether the issued BIER forwarding information is issued before, if so, continuing processing, and turning to step 217; otherwise, go to step 218;

step 217: judging whether the BFIR-id and the BFER-id of the issued cluster member are changed; if yes, continue processing, go to step 218; otherwise, go to step 210;

step 218: the MCPTT server sends the forwarding information of the BIER to the eNB/Cell of all member UE.

Fig. 9 is a schematic diagram of the flow forwarding of the combination of MCPTT and BIER technologies according to the embodiment of the present invention.

After the trunking call is established, the source UE1 sends messages to the group members UE2 and UE3, the dotted line in the figure is the forwarding path of the message, reference numeral 7 is the source UE1 sends the message to the corresponding eNB/Cell, reference numeral 8 is the eNB/Cell performs BIER header encapsulation and BIER forwarding on the message according to the BIER forwarding information issued before, and reference numeral 9 is the destination eNB/Cell removes the BIER header from the message and sends the message to the member UE wirelessly. The three reference numerals correspond to steps 107, 108, 109 in fig. 7, respectively.

In the process of establishing the MCPTT, the establishment of a multicast tree is not triggered any more, but multicast forwarding is replaced by BIER network forwarding, the first 4 steps are the same as the establishment of the existing cluster, after the MCPTT server finishes controlling cluster parameter generation and issues to UE, when a group member needs to initiate a cluster call, the MCPTT server has two modes to acquire cluster member information:

in the first mode, when a cluster is established, a UE sends signaling information to an MCPTT server, and the MCPTT server acquires information of an eNB/Cell from the signaling, where the eNB/Cell is an access node of a BIER domain corresponding to a cluster member.

In the second mode, the MCPTT server acquires the eNB/Cell information from the CN and generates an access node of a BIER domain corresponding to the cluster member.

The eNB/Cell device corresponds to an access node to which a BIER message is forwarded, and the MCPTT server needs to send BIER forwarding information to the eNB/Cell device through a signaling Protocol, where the signaling Protocol may be an extension of an SIP (Session Initiation Protocol)/SDP (Session Description Protocol), or an SAP (Session notification Protocol), or a Diameter signaling Protocol. Described below, respectively:

the method comprises the following steps of using SIP/SDP signaling to carry out extension to send an entrance node and an exit node of a BIER to an eNB/Cell, wherein a session layer part and a media layer part are arranged in an SDP session protocol, the attribute a of the session layer part can be used for extension, and the extension modes comprise two modes:

the first expansion mode is as follows: the format of the attribute a is as follows

a＝<bier>:<type><length><reserved><subdomain><mt><bsl><bfir-id><1*(bfer-id)>

The bfir-id and the bfer-id respectively indicate the eNBs/cells corresponding to the source and destination members in the cluster, that is, the ingress node and the egress node of the message forwarding of the BIER network, the egress node is at least one, and the total number is determined by length. Reserved can be used as a protocol format, for example, when Reserved is 1, it is this extension, and one ingress node and multiple egress nodes must be included.

The second expansion mode is as follows: the format of the attribute a is as follows

a＝<bier>:<type><length><reserved><subdomain><mt><bsl><bitstring>

The difference from the first extension is the last < BITSTRING >, which is a BITSTRING of BITSTRING type, and all edge nodes of the BIER network correspond to each bit of the string. The corresponding bit position of the eNB/Cell node corresponding to the cluster member in the bit string needs to be set to 1, and the rest are set to 0. The total number of Bit bits is determined by bsl, and the BIER node corresponding to each Bit needs to be configured through a BIER network before. Reserved may be a protocol format, for example, when Reserved is 2, this extended format.

The bier attribute in The embodiment of The present invention needs to be registered in IANA (The Internet Assigned Numbers Authority), otherwise some devices cannot parse The attribute field.

The method comprises the following steps of using an SAP protocol to expand, using the SAP signaling to expand and sending an entrance node and an exit node of a BIER to an eNB/Cell, using an attribute a of a session layer part and a media layer part in an SDP session protocol to expand, wherein the expansion mode comprises two modes:

the first expansion mode is as follows: information format encoding as shown in fig. 10, TLV (Type, Length, Value) is adopted, where Type indicates the Type of the subsequent content, where the Value is pending, and Length indicates the information Length of this Type. The latter 4 bytes define the standard definition of IETF (Internet Engineering Task Force). The following definitions of BFIR-id, BFER-id are also equivalent to the standard definitions of IETF, and there are many BFER-ids.

The second expansion mode is as follows: information format encoding as shown in fig. 11, TLV is adopted, where Type indicates the Type of subsequent content, where the value is pending, and Length indicates the information Length of this Type. The latter 4 bytes define the standard definition of IETF. The following bitstring definition is also equivalent to the IETF standard definition. This is a BIT STRING of type STRING, and all edge nodes of the BIER network correspond to each BIT of this STRING. The corresponding bit position of the eNB/Cell node corresponding to the cluster member in the bit string needs to be set to 1, and the rest are set to 0. The total number of Bit bits is determined by bsl, and the BIER node corresponding to each Bit needs to be configured through a BIER network before.

In addition, the signaling protocol can also be extended by the AVP (Attribute Length Value) of the Diameter protocol, and the BIER information to be transferred is similar to the SIP/SDP signaling protocol extension.

The MCPTT server issues the acquired cluster eNB/Cell information through signaling, and has two modes:

specifying a mode: and sending the information carrying the cluster BIER node to an eNB/Cell corresponding to the source UE, encapsulating a BIER head according to the transmitted BIER forwarding information after the eNB/Cell receives the message from the source UE, forwarding the message in a BIER network, and receiving the forwarded message by a target eNB/Cell according to a BIER rule.

Autonomous mode: and sending the information carrying the cluster BIER node to eNB/Cell corresponding to all cluster member UE, wherein the eNB/Cell takes the node of the eNB/Cell as a BIER input node, and all other nodes as output nodes. When the UE sends a message, the corresponding eNB/Cell performs BIER head encapsulation and forwards the message in the BIER network.

By the embodiment of the invention, the BIER technology can be applied to a key task push-to-talk (MCPTT) scene, and the source UE does not need to unicast the information to an MCPTT server and directly sends the information to the BIER network for forwarding, thereby reducing the waste of flow and time. Meanwhile, the BIER network distinguishes an ingress node and an egress node, the flow sent by the source cannot be returned to the source, and an evasion mechanism does not need to be added. In addition, the mobility of the user is well supported, and when the UE moves, the multicast tree does not need to be frequently reconstructed, so that the construction time of the multicast tree is eliminated, and the packet loss is reduced.

Example four

As shown in fig. 12, the MCPTT server issues BIER forwarding information to the eNB/Cell corresponding to the source UE in a designated mode:

step 301, UE1, UE2, and UE3 notify the MCPTT server through signaling, forming a cluster communication group.

Step 302, the MCPTT server generates a cluster ID, and parameters of the control cluster such as the MCPTT ID and the MC ID of the UE.

Step 303, the MCPTT server allocates itself, or acquires the multicast IP address through the BM-SC, and associates it with the cluster ID to notify the UE of the relevant parameters.

Step 304, the source UE1 sends a notification to the MCPTT server that a group call needs to be made.

Step 305, the MCPTT server obtains, from the Core Network (CN), the eNB/Cell1, eNB/Cell2, and eNB/Cell3 corresponding to all the member UEs in the cluster where the UE1 is located, the eNB/Cell1 corresponding to the UE1 serves as an ingress node of the BIER network, and the remaining enbs/cells serve as egress nodes, and are encapsulated in the first extension mode of SDP signaling.

And step 306, the MCPTT server sends the encapsulated information to the eNB/Cell1 corresponding to the source UE1 through SDP signaling. The signaling in the figure is part of the format of the a attribute in the extended signaling protocol received by eNB/Cell 1.

Step 307, the source UE1 sends a packet to the eNB/Cell1, and the eNB/Cell1 encapsulates the received BFER into a BIER packet header and forwards the packet through the BIER network.

Step 308, the BIER network forwards the message added with the BIER header to all BIER egress nodes, namely, the eNB/Cell2 and the eNB/Cell3 of the cluster destination.

And step 309, removing the BIER header by the eNB/Cell2 and the eNB/Cell3 and sending the message to the group members UE2 and UE3 through a wireless channel.

EXAMPLE five

As shown in fig. 13, the MCPTT server issues BIER forwarding information to all enbs/cells corresponding to the UE in an autonomous mode:

step 401, UE1, UE2, and UE3 notify the MCPTT server through signaling, forming a cluster communication group.

Step 402, the MCPTT server generates a cluster ID, and parameters of a control cluster such as the MCPTT ID and the MC ID of the UE.

Step 403, the MCPTT server allocates itself, or acquires the multicast IP address through BM-SC, and associates it with the cluster ID, and notifies the UE of the relevant parameters.

Step 404, the group member UE1 sends a notification to the MCPTT server that a group call needs to be made.

And 405, the MCPTT server acquires eNB/cells corresponding to all member UEs from the existing signaling, and packages the eNB/cells serving as BFR-ids in a second extension mode of SDP signaling.

And step 406, the MCPTT server sends the encapsulated protocol information to the eNBs/cells corresponding to all the cluster UEs through SDP signaling. Wherein the BIT STRING field in the extended signaling is 0111.

Step 407, the source UE1 sends a packet to the eNB/Cell1, and the eNB/Cell1 encapsulates the egress node in the received BFR-id into a BIER packet header and forwards the packet to the BIER network, where the eNB/Cell2 and the eNB/Cell3 serve as egress nodes BFER.

Step 408, the BIER network forwards the message added with the BIER header to all BIER egress nodes, namely eNB/Cell2 and eNB/Cell3 of the cluster destination.

And step 409, the eNB/Cell2 and the eNB/Cell3 remove the BIER header and send the message to the group members UE2 and UE3 through a wireless channel.

EXAMPLE six

As shown in fig. 14, the flow of group member movement after the cluster communication is established is as follows:

and step 501, the UE1, the UE2 and the UE3 notify the MCPTT server through signaling to form a cluster communication group.

Step 502, the MCPTT server generates a cluster ID, and parameters of a control cluster such as the MCPTT ID and the MC ID of the UE.

Step 503, the MCPTT server allocates itself, or acquires the multicast IP address through BM-SC, and associates it with the cluster ID, and notifies the UE of the relevant parameters.

Step 504, the source UE1 sends a notification to the MCPTT server that a group call needs to be made.

And step 505, the MCPTT server acquires eNB/cells corresponding to all member UEs from the existing signaling, and encapsulates the eNB/cells as BFR-ids in a second extension mode of SDP signaling.

Step 506, the MCPTT server sends the encapsulated protocol information to the enbs/cells corresponding to all the cluster UEs through SDP signaling, where the BIT STRING field in the extended signaling is 0111. Bit strings in a solid frame in the figure are part of BIER forwarding signaling information sent down for the first time.

And step 507, the source end UE1 sends a message to the eNB/Cell1, the eNB/Cell1 encapsulates the received BFR-id egress node into a BIER message header and forwards the BFR-id egress node to the BIER network, wherein the BFR-id which is removed from the eNB/Cell and set to 1 is taken as the egress node BFER, namely the eNB/Cell2 and the eNB/Cell 3.

Step 508, the BIER network forwards the message added with the BIER header to all BIER egress nodes, namely eNB/Cell2 and eNB/Cell3 of the cluster destination.

And step 509, the eNB/Cell2 and the eNB/Cell3 remove the BIER header and send the message to the UE2 and the UE3 in the group through a wireless channel.

Step 510, the group member UE3 moves to the eNB/Cell4, and the MCPTT server obtains the eNB/Cell4 corresponding to the changed UE 3.

Step 511, the MCPTT server repackages the BIER forwarding information and sends the information to the eNB/Cell of all clusters through SDP signaling, namely eNB/Cell1, eNB/Cell2 and eNB/Cell 4. Where the BIT STRING field in the extended signaling is 1011. The bit string in the dashed box in the figure is the retransmitted part of BIER forwarding signaling information.

Step 512, the source UE1 sends a packet to the eNB/Cell1, and the eNB/Cell1 encapsulates the received BFR-id into a BIER packet header and forwards the BIER packet header to the BIER network, where the BFR-id is removed from the local eNB/Cell and set to 1 as an egress node BFER, that is, the eNB/Cell2 and the eNB/Cell 3.

Step 513, the BIER network forwards the message added with the BIER header to eNB/Cell2 and eNB/Cell 4.

And step 514, the eNB/Cell2 and the eNB/Cell4 remove the BIER header and send the message to the UE2 and the UE3 in the group through a wireless channel.

EXAMPLE seven

As shown in fig. 15, the process of source movement after cluster communication is established includes the following steps:

step 601, UE1, UE2, and UE3 notify the MCPTT server through signaling, forming a cluster communication group.

Step 602, the MCPTT server generates a cluster ID, and parameters of the control cluster such as the MCPTT ID and the MC ID of the UE.

Step 603, the MCPTT server allocates itself, or acquires the multicast IP address through BM-SC, and associates the multicast IP address with the cluster ID to inform the UE of the relevant parameters.

Step 604, the source UE3 sends a notification to the MCPTT server that a group call needs to be made.

Step 605, the MCPTT server obtains the enbs/cells corresponding to all the member UEs from the existing signaling, and encapsulates the enbs/cells as BFR-ids in the second extension mode of the SDP signaling.

Step 606, the MCPTT server sends the encapsulated protocol information to the enbs/cells corresponding to all the cluster UEs through SDP signaling, where the BIT STRING field in the extended signaling is 0111. The black bit string in the figure is part of the BIER forwarding signaling information sent down for the first time.

Step 607, the source UE3 sends a packet to the eNB/Cell3, the eNB/Cell3 encapsulates the received BFR-id into a BIER packet header and forwards the BIER packet header to the BIER network, wherein the eNB/Cell1 and the eNB/Cell2 serve as egress nodes BFER and are encapsulated into the BIER header.

Step 608, the BIER network forwards the message added with the BIER header to all BIER egress nodes, i.e. eNB/Cell1 and eNB/Cell2 of the cluster destination.

And step 609, the eNB/Cell1 and the eNB/Cell2 remove the BIER header and send the message to the UE1 and the UE2 in the group through a wireless channel.

Step 610, the source UE3 moves under eNB/Cell4, and the MCPTT server obtains eNB/Cell4 corresponding to the changed UE 3.

Step 611, the MCPTT server repackages the BIER forwarding information and sends the information to the eNB/Cell of all clusters through SDP signaling, namely eNB/Cell1, eNB/Cell2 and eNB/Cell 4. Where the BIT STRING field in the extended signaling is 1011. The green bit string in the figure is the retransmitted part of the BIER forwarding signaling information.

Step 612, the source UE3 sends a message to the eNB/Cell4, the eNB/Cell4 encapsulates the received BFR-id into a BIER message header and forwards the BIER message header to the BIER network, wherein the eNB/Cell1 and the eNB/Cell2 serve as egress nodes BFER and are encapsulated into the BIER header.

Step 613, the BIER network forwards the message added with the BIER header to the eNB/Cell1 and the eNB/Cell 2.

And step 614, the eNB/Cell1 and the eNB/Cell2 remove the BIER header and send the message to the UE1 and the UE2 in the group through a wireless channel.

Example eight

Fig. 16 is a schematic diagram of an MCPTT server according to an embodiment of the present invention, and as shown in fig. 16, the MCPTT server according to the embodiment includes:

In an embodiment, the obtaining module obtains the information of the cluster base station or the cell by the following steps: and acquiring the information of the base stations or the cells corresponding to all the members of the cluster from the received signaling information, or acquiring the information of the base stations or the cells corresponding to all the members of the cluster in which the source terminal is located from the core network.

In an embodiment, the sending module sends the bit index explicit duplicate BIER forwarding information to the relevant base station or cell, including: and judging whether the BIER forwarding information is issued before, if not, sending the BIER forwarding information to a related base station or cell, if so, judging whether the issued BIER forwarding information is changed, and if so, sending the BIER forwarding information to the related base station or cell.

In an embodiment, the sending module sends the bit index explicit duplicate BIER forwarding information to the relevant base station or cell, including: and sending the BIER forwarding information to a base station or a cell corresponding to a source terminal, or sending the BIER forwarding information to base stations or cells corresponding to all cluster members, wherein the BIER forwarding information comprises the entry node information of the BIER and the exit node information of the BIER.

In an embodiment, the sending module sends the bit index explicit copy BIER forwarding information to the relevant base station or cell by extending any one of the following signaling protocols: session initiation protocol, session description protocol, session announcement protocol, diameter protocol.

In an embodiment, the notifying, by the processing module, the source terminal to send the group call packet includes: and judging whether the cluster member moves, if not, informing the source terminal that the message can be sent, and if so, informing the acquisition module to acquire the information of the base station or the cell of the cluster member again.

An embodiment of the present invention further provides an MCPTT server, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of:

and informing the source terminal to send the cluster call message.

Example nine

Fig. 17 is a schematic diagram of a device for processing a group call according to an embodiment of the present invention, and as shown in fig. 17, the device according to this embodiment includes:

Wherein, the BIER forwarding information comprises the ingress node information of the BIER and/or the egress node information of the BIER.

The device for processing the cluster call in this embodiment is an eNB/Cell of a BIER access node.

Example ten

Fig. 18 is a schematic diagram of a device for processing a group call according to an embodiment of the present invention, and as shown in fig. 18, the device according to this embodiment includes:

The device for processing the cluster call in this embodiment is an eNB/Cell of a BIER egress node.

Embodiments of the present invention further provide a computer-readable storage medium storing computer-executable instructions, which when executed implement the method for processing a group call.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.

The foregoing is only a preferred embodiment of the present invention, and naturally there are many other embodiments of the present invention, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the scope of the appended claims.

Claims

1. A method of group call processing, comprising:

2. The method of claim 1, wherein the MCPTT server obtaining cluster base station or cell information is performed by:

3. The method of claim 1, wherein the MCPTT server sending bit index explicit duplicate BIER forwarding information to the associated base station or cell, comprising:

4. The method of any of claims 1-3, wherein the MCPTT server sending bit index explicit duplicate BIER forwarding information to the associated base station or cell, comprising:

5. The method of claim 1, wherein the MCPTT server sends bit index explicit duplicate forwarding information to the associated base station or cell by extending any one of the following signaling protocols:

6. The method of claim 1,

the BIER forwarding information comprises the ingress node information of the BIER and the egress node information of the BIER.

7. The method of claim 1, wherein the MCPTT server notifying a source terminal to send a group call message, comprising:

8. A mission critical push-to-talk MCPTT server, comprising:

9. The MCPTT server of claim 8,

the acquisition module acquires information of the cluster base station or the cell by the following method: and acquiring the information of the base stations or the cells corresponding to all the members of the cluster from the received signaling information, or acquiring the information of the base stations or the cells corresponding to all the members of the cluster in which the source terminal is located from the core network.

10. The MCPTT server of claim 8,

the sending module sends the bit index explicit duplicate BIER forwarding information to the relevant base station or cell, and includes: and judging whether the BIER forwarding information is issued before, if not, sending the BIER forwarding information to a related base station or cell, if so, judging whether the issued BIER forwarding information is changed, and if so, sending the BIER forwarding information to the related base station or cell.

11. The MCPTT server of any one of claims 8 to 10,

the sending module sends the bit index explicit duplicate BIER forwarding information to the relevant base station or cell, and includes: and sending the BIER forwarding information to a base station or a cell corresponding to a source terminal, or sending the BIER forwarding information to base stations or cells corresponding to all cluster members, wherein the BIER forwarding information comprises the entry node information of the BIER and the exit node information of the BIER.

12. The MCPTT server of claim 8,

the sending module sends the bit index explicit copy BIER forwarding information to the relevant base station or cell by extending any one of the following signaling protocols: session initiation protocol, session description protocol, session announcement protocol, diameter protocol.

13. The MCPTT server of claim 8,

the processing module, notifying the source terminal to send the cluster call message, includes: and judging whether the cluster member moves, if not, informing the source terminal that the message can be sent, and if so, informing the acquisition module to acquire the information of the base station or the cell of the cluster member again.

14. A mission critical push-to-talk MCPTT server, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of:

and informing the source terminal to send the cluster call message.

15. A method of group call processing, comprising:

16. An apparatus for group call processing, comprising: