WO2017016493A1

WO2017016493A1 - Method for managing group call areas in sc-ptm system

Info

Publication number: WO2017016493A1
Application number: PCT/CN2016/091935
Authority: WO
Inventors: 蔡杰; 陈喆
Original assignee: 普天信息技术有限公司
Priority date: 2015-07-29
Filing date: 2016-07-27
Publication date: 2017-02-02
Also published as: CN106412842A; CN106412842B

Abstract

A method for managing group call areas in an SC-PTM system is provided in the present invention, comprising: UE participating in a group call sends a first message carrying a group call group identifier, a source cell identifier and a UE identifier to a target cell when the UE is reselecting a cell; the target cell determines that the UE participates in the group call according to the group identifier, maintains a group call list of the target cell according to the group identifier and the UE identifier, and according to the source cell identifier, sends a second message (carrying the UE identifier and the group identifier) to a source cell corresponding to the source cell identifier; after receiving the second message, the source cell determines the group call participated by the UE according to the group identifier, deletes the information of the UE identifier in the group call of the group call list of the source cell, determines the number of the UE participating in the group call according to the group call list, and accordingly judges whether to perform bearer type conversion or bearer release of the group call. The method can accurately obtain the number of the terminals participating in the group call in the cell, provide the basis for selecting the bearer type of the group call in the cell, ensure the service continuity and improve the signal transmission quality at the same time.

Description

Group call area management method under SC-PTM system

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a group call area management method in an SC-PTM system.

Background technique

The Single-Cell Point-to-Multipoint (SC-PTM) issue of the 3rd Generation Partnership Project (3GPP) has studied Long Term Evolution (LTE). The feasibility of the single-cell point-to-multipoint transmission is supported in the system, and a mobility solution is proposed. For the user equipment (User Equipment, UE for short) in the RRC_CONNECTED state, the evolved Node B (eNB) The call configuration of the target cell is provided to the UE in the RRC_IDLE state. For the UE in the RRC_IDLE state, the call configuration of the neighboring cell may be broadcast by the current serving cell, or the UE may enter the RRC_CONNECTED state when the UE is about to leave the cell, and complete the inter-cell mobility by the handover. .

The above mobility scheme mainly considers how to ensure that the UE enters the target cell with minimal service interruption, but does not consider the processing mechanism of the source cell after the UE completes the mobility. According to the requirements of the SC-PTM, the network needs to determine the bearer type used in the cell according to the number of UEs participating in the call. If the number of UEs participating in the call is too low, the cell will use the unicast bearer instead of the SC-PTM bearer to ensure conversation quality. As described above, the existing scheme of 3GPP only considers the case of the target cell, ignoring the change in the number of UEs of the source cell.

In response to the above problems, the main solution of the domestic industry is solved by a non-access stratum (NAS) mechanism. For example, when the UE initiates the tracking area update process, the core network maintains the tracking area involved in each call, so that it can be determined which tracking areas have not participated in the group calling UE, thereby instructing the base station to release the corresponding tracking area. Group call resources.

The existing scheme of the 3GPP only considers the situation of the target cell, neglects the change of the number of UEs in the source cell, and cannot determine the bearer type in the source cell; the NAS mechanism can only solve the problem in the granularity of the UE tracking area list, in the actual network. , the tracking area list generally contains multiple tracking areas, and one tracking The area generally contains multiple cells, so the NAS mechanism can only perform rough UE counting, and the accuracy is not enough.

In view of this, how to know the number of terminals participating in a group call in a cell, and providing a basis for selecting a cell group bearer type, and improving the signal transmission quality under the premise of ensuring service continuity has become a technical problem that needs to be solved at present.

Summary of the invention

To solve the above technical problem, the present invention provides a group call area management method in an SC-PTM system, which can accurately know the number of terminals participating in a group call in a cell, and provide a basis for selecting a cell group call type of a cell, and guarantee the service. Improve signal transmission quality under the premise of continuity.

In a first aspect, the present invention provides a group call area management method in an SC-PTM system, including:

The user equipment UE that participates in the group call sends a first message to the target cell when the cell is reselected, and the first message carries the group identifier, the source cell identifier, and the UE identifier of the group call that the UE participates in;

After receiving the first message, the target cell determines that the UE participates in a group call according to the group identifier in the first message, and maintains a group call list of the target cell according to the group identifier and the UE identifier. And sending, by the source cell identifier, a second message to the source cell corresponding to the source cell identifier, where the second message carries the UE identifier and the group identifier;

After the source cell receives the second message, determining, according to the group identifier, the group call that the UE participates in, deleting the information of the UE identifier in the group call in the group call list of the source cell, and Determining, according to the group call list, the number of UEs participating in the group call, and determining, according to the number of UEs participating in the group call, whether to perform bearer type conversion of the group call or release of the group call.

Optionally, before the user equipment UE that participates in the group call sends the first message to the target cell, the method further includes:

When the UE receives the notification message of the group call for the first time, the UE sends a third message to the source cell, where the third message carries the group identifier and the UE identifier of the group call that the UE participates in;

The source cell maintains a group call list of the source cell according to the group identifier and the UE identifier.

Optionally, the third message is a radio resource control RRC message or a media access control MAC message.

Optionally, the RRC message is specifically a radio resource control connection request RRCConnectionRequest message.

Optionally, the media access control MAC message is specifically an MSG3 message of a random access procedure.

Optionally, the source cell identifier includes: a physical cell identifier PCI, and/or a global cell identifier CGI.

Optionally, the first message is a radio resource control RRC message or a media access control MAC message.

According to the foregoing technical solution, the group call area management method in the SC-PTM system of the present invention can accurately know the number of terminals participating in a group call in a cell, and provide a basis for selecting a cell group call type, and ensuring service continuity. Improve the signal transmission quality.

DRAWINGS

1 is a schematic flowchart of a group call area management method in an SC-PTM system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of signaling that a UE sends a group identifier and a UE identifier to a source cell by using an RRC message according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of signaling of a UE sending a group identifier and a UE identifier to a source cell by using an RRCConnectionRequest message according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of signaling of a UE transmitting a group identifier and a UE identifier to a source cell by using a randomly accessed MSG3 message according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a group identity MAC CE added by a UE by using a randomly accessed MSG3 message according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a UE identity MAC CE added by a UE by using a randomly accessed MSG3 message according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of signaling for a UE to send a group identifier, a source cell identifier, and a UE identifier to a target cell by using an RRC message according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of signaling for a UE to send a group identifier, a source cell identifier, and a UE identifier to a target cell by using an RRCConnectionRequest message according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of signaling for a UE to send a group identifier, a source cell identifier, and a UE identifier to a target cell by using a randomly accessed MSG3 message according to an embodiment of the present disclosure;

10 is a schematic structural diagram of a cell identity MAC CE added by a UE by using a randomly accessed MSG3 message according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is only a part of the embodiments of the invention, not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 is a schematic flowchart of a group call area management method in an SC-PTM system according to an embodiment of the present invention. As shown in FIG. 1, the group call area management method in the SC-PTM system of this embodiment is shown in FIG. As described below.

The user equipment UE that participates in the group call (in the IDLE state) sends a first message to the target cell when the cell is reselected. The first message carries the group identifier, the source cell identifier, and the UE identifier of the group call that the UE participates in. .

In a specific application, the source cell identifier in this embodiment may include, but is not limited to, a physical cell identifier (PCI), and/or a global cell identifier (CGI).

In a specific application, the group identifier sent by the embodiment should be unique to the network, such as Temporary Mobile Group Identity (TMGI), because different cell base stations may be involved in the UE mobile process.

In a specific application, for example, the first message in this embodiment may be a radio resource control RRC message. As shown in FIG. 7, the group identifier and the source cell identifier may be added to the RRC message.

Further, for example, the radio resource control RRC message may specifically be selected as a radio resource control connection request RRCConnectionRequest message, as shown in FIG. The identity and source cell identity are added to the RRCConnectionRequest message as new cells.

In a specific application, for example, the first message in this embodiment may also be a Media Access Control (MAC) message;

Further, for example, the MAC message may be specifically selected as an MSG3 message of a random access procedure, and as shown in FIG. 9, the group identifier may be used as a new media access control layer control unit (MAC Control). The element (abbreviated as MAC CE) is added to the randomly accessed MSG3 message, and the source cell identifier is added to the MSG3 message as another new MAC CE (as shown in FIG. 10), and the UE identifier is used as the Another new MAC CE is added to the MSG3 message.

After the first cell receives the first message, the target cell determines that the UE participates in a group call according to the group identifier in the first message, and maintains the group call of the target cell according to the group identifier and the UE identifier. The second message is sent to the source cell corresponding to the source cell identifier according to the source cell identifier, where the second message carries the UE identifier and the group identifier.

After the source cell receives the second message, determine, according to the group identifier, a group call that the UE participates in, and delete information about the UE identifier in the group call in the group call list of the source cell. And determining, according to the group call list, the number of UEs participating in the group call, and determining, according to the number of UEs participating in the group call, whether to perform bearer type conversion of the group call or release of the group call.

It can be understood that if the number of UEs participating in the group call is 0, the bearer release of the group call is performed.

In a specific application, before the foregoing step 101 in this embodiment, steps S1 and S2 not shown in the figure are further included:

S1: When receiving the notification message of the group call for the first time, the UE sends a third message to the source cell, where the third message carries the group identifier and the UE identifier of the group call that the UE participates in.

In a specific application, for example, the third message may be a radio resource control RRC message, as shown in FIG. 2, the group identifier may be added to the RRC message;

Further, for example, the radio resource control RRC message may specifically be selected as a radio resource control connection request RRCConnectionRequest message, and as shown in FIG. 3, the group identifier may be added as a new cell to the RRCConnectionRequest message.

In a specific application, for example, the third message may also be a media access control (Media) Access Control (MAC) message;

Further, for example, the MAC message may be specifically selected as an MSG3 message of a random access procedure, and as shown in FIG. 4, the group identifier may be added as a new MAC CE (as shown in FIG. 5). In the randomly accessed MSG3 message, the UE identity is added to the MSG3 message as another new MAC CE (as shown in FIG. 6).

S2. The source cell maintains a group call list of the source cell according to the group identifier and the UE identifier (as shown in Table 1).

Table 1

The group call area management method in the SC-PTM system of the present embodiment can accurately know the number of terminals participating in a group call in a cell, provide a basis for selecting a cell group call type, and improve signal transmission quality under the premise of ensuring service continuity. .

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, and not The invention is described in detail with reference to the foregoing embodiments, and those skilled in the art should understand that the technical solutions described in the foregoing embodiments may be modified or some or all of the technical features may be modified. The equivalents are made without departing from the scope of the technical solutions of the embodiments of the present invention.

Claims

A group call area management method in an SC-PTM system, characterized in that it comprises:

The user equipment UE that participates in the group call sends a first message to the target cell when the cell is reselected, and the first message carries the group identifier, the source cell identifier, and the UE identifier of the group call that the UE participates in;

After receiving the first message, the target cell determines that the UE participates in a group call according to the group identifier in the first message, and maintains a group call list of the target cell according to the group identifier and the UE identifier. And sending, by the source cell identifier, a second message to the source cell corresponding to the source cell identifier, where the second message carries the UE identifier and the group identifier;

After the source cell receives the second message, determining, according to the group identifier, the group call that the UE participates in, deleting the information of the UE identifier in the group call in the group call list of the source cell, and Determining, according to the group call list, the number of UEs participating in the group call, and determining, according to the number of UEs participating in the group call, whether to perform bearer type conversion of the group call or release of the group call.
The method according to claim 1, wherein before the user equipment UE that participates in the group call sends the first message to the target cell, the method further includes:

When the UE receives the notification message of the group call for the first time, the UE sends a third message to the source cell, where the third message carries the group identifier and the UE identifier of the group call that the UE participates in;

The source cell maintains a group call list of the source cell according to the group identifier and the UE identifier.
The method according to claim 2, wherein the third message is a radio resource control RRC message or a medium access control MAC message.
The method according to claim 3, wherein the radio resource control RRC message is specifically a radio resource control connection request RRCConnectionRequest message.
The method according to claim 3, wherein the media access control MAC message is specifically an MSG3 message of a random access procedure.
The method according to claim 1, wherein the source cell identifier comprises: a physical cell identifier PCI, and/or a global cell identifier CGI.
The method according to claim 1, wherein the first message is a radio resource control RRC message or a medium access control MAC message.
The method according to claim 7, wherein the radio resource control RRC message is specifically a radio resource control connection request RRCConnectionRequest message.
The method according to claim 7, wherein the medium access control MAC message is specifically an MSG3 message of a random access procedure.