WO2017016495A1

WO2017016495A1 - Group-calling region management method under sc-ptm system

Info

Publication number: WO2017016495A1
Application number: PCT/CN2016/091954
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: CN106412851B; CN106412851A

Abstract

The invention provides a group-calling region management method under an SC-PTM system. The method comprises: when a cell is selected, a UE participating in a group call sends to a target cell a first message carrying a group identifier, a source cell identifier and a UE identifier; after receiving the first message, the target cell sends to the MCE thereof a second message carrying a group identifier, a UE identifier, a source cell identifier and a target cell identifier; the MCE maintains the group call list of target cells according to the group identifier and the UE identifier, and according to the target cell identifier, transmits to the corresponding target cell a third message carrying an indication about whether the group call bearer type is to be converted, deletes from a source cell group call list the UE identification information in the group call, and according to the source cell identifier transmits to the corresponding source cell a fourth message with an indication about whether the group call bearer is to be released or whether the bearer type is to be converted; and, according to the fourth message, the source cell releases the bearer, or converts or does not convert the bearer type. The number of terminals participating in the group call under the cell can be precisely acquired, in order to provide a basis for the selection of a group call bearer type in the cell, and ensure service continuity while improving the signal transmission quality.

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 sends a second message to the associated multi-cell/multicast coordination entity (MCE), where the second message carries the group identifier, the source cell identifier, and the target cell identifier of the group call that the UE participates in. , UE identification;

After receiving the second message, the MCE determines a group call that the UE participates according to the group identifier in the second message, and maintains a group call list of the target cell according to the group identifier and the UE identifier. Transmitting, according to the target cell identifier, a third message to the target cell corresponding to the target cell identifier, where the third message carries information for indicating whether the target cell performs bearer type conversion of the group call, where The information carried in the third message is determined by the MCE to determine the number of UEs participating in the group call according to the group call list of the target cell, and determining whether the target cell is performed according to the number of UEs participating in the group call. Determined by the bearer type conversion of the group call;

After the MCE determines the group call that the UE participates according to the group identifier in the second message, the MCE also deletes the information of the UE identifier in the group call in the group call list of the source cell, and according to the The source cell identifier sends a fourth message to the source cell corresponding to the source cell identifier, where the fourth message carries information for indicating that the source cell releases the bearer of the group call, or carries the information indicating the source cell. Whether the information of the bearer type conversion of the group call is performed, wherein the information carried by the fourth message is determined by the MCE according to the group call list of the source cell, and the number of UEs participating in the group call is determined according to the participation The number of UEs in the group, determining whether the source cell performs the group call Determined by the bearer type conversion or whether the bearer release of the group call is performed;

After receiving the fourth message, the source cell releases the bearer of the group call that the UE participates according to the fourth message, or performs or does not perform the group call that the UE participates according to the fourth message. Bearer type conversion;

The source cell and the target cell all belong to the same MCE.

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

After receiving the fifth message, the source cell sends a sixth message to the associated MCE, where the sixth message carries the group identifier and the UE identifier of the group call that the UE participates in;

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

Optionally, the fifth 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 above technical solution, the group call area management method under the SC-PTM system of the present invention, It can accurately know the number of terminals participating in the group call under the cell, provide a basis for the cell group bearer type selection, and improve the signal transmission quality under the premise of ensuring service continuity.

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. Based on embodiments of the present invention, those of ordinary skill in the art will be able to do without creative work. All other embodiments obtained are within the scope of the 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), etc., 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. 8, the group identifier and the source cell identifier may be added as new cells to In the RRCConnectionRequest message.

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 added as a new MAC CE to a randomly accessed MSG3 message. The source cell identifier is added to the MSG3 message as another new MAC CE (as shown in FIG. 10), and the UE identity is added to the MSG3 message as another new MAC CE.

After receiving the first message, the target cell sends a second message to the associated multi-cell/multicast coordination entity (MCE), where the second message carries the UE participation. Group ID of the group call, source cell identifier, target cell identifier, UE Logo.

After the MCE receives the second message, determining, according to the group identifier in the second message, the group call that the UE participates in, and maintaining the group of the target cell according to the group identifier and the UE identifier. Sending a third message to the target cell corresponding to the target cell identifier according to the target cell identifier, where the third message carries information for indicating whether the target cell performs bearer type conversion of the group call, The information carried in the third message is determined by the MCE determining the number of UEs participating in the group call according to the group call list of the target cell, and determining the target cell according to the number of UEs participating in the group call. Whether to determine the bearer type conversion of the group call.

After the MCE determines the group call that the UE participates according to the group identifier in the second message, the MCE also deletes the information of the UE identifier in the group call in the group call list of the source cell, and And sending, by the source cell identifier, a fourth message to the source cell corresponding to the source cell identifier, where the fourth message carries information for indicating that the source cell releases the bearer of the group call, or carries Whether the source cell performs the bearer type conversion information of the group call, where the information carried by the fourth message is determined by the MCE according to the group call list of the source cell, and the number of UEs participating in the group call is determined according to the Determining, by the number of UEs participating in the group call, determining whether the source cell performs bearer type conversion of the group call or whether to perform bearer release of the group call;

It can be understood that, if the number of UEs participating in the group call is 0, the third message carries information for indicating that the source cell releases the bearer of the group call in which the UE participates.

After receiving the fourth message, the source cell releases the bearer of the group call that the UE participates according to the fourth message, or performs or does not perform the group that the UE participates according to the fourth message. The bearer type conversion of the call.

The source cell and the target cell all belong to the same MCE.

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. .

In a specific application, before the foregoing step 101 in this embodiment, steps P1-P3 not shown in the figure are further included:

When the UE receives the notification message of the group call for the first time, the UE sends a fifth message to the source cell, where the fifth 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 fifth 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 fifth message may also be a Media Access Control (MAC) message;

Further, for example, the MAC message may be specifically selected as a MSG3 message of a random access procedure. As shown in FIG. 4, the group identifier may be used as a new media access control layer control unit (MAC Control). The Element (abbreviated as MAC CE) (as shown in FIG. 5) is added to the randomly accessed MSG3 message, and the UE identifier is added to the MSG3 message as another new MAC CE (as shown in FIG. 6).

After receiving the fifth message, the source cell sends a sixth message to the associated MCE, where the sixth message carries the group identifier and the UE identifier of the group call that the UE participates in.

P3. The MCE maintains a group call list of the source cell according to the group identifier and the UE identifier in the sixth message (as shown in Table 1).

Table 1

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 merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

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 sends a second message to the associated multi-cell/multicast coordination entity (MCE), where the second message carries the group identifier, the source cell identifier, and the target cell identifier of the group call that the UE participates in. , UE identification;

After receiving the second message, the MCE determines a group call that the UE participates according to the group identifier in the second message, and maintains a group call list of the target cell according to the group identifier and the UE identifier. Transmitting, according to the target cell identifier, a third message to the target cell corresponding to the target cell identifier, where the third message carries information for indicating whether the target cell performs bearer type conversion of the group call, where The information carried in the third message is determined by the MCE to determine the number of UEs participating in the group call according to the group call list of the target cell, and determining whether the target cell is performed according to the number of UEs participating in the group call. Determined by the bearer type conversion of the group call;

After the MCE determines the group call that the UE participates according to the group identifier in the second message, the MCE also deletes the information of the UE identifier in the group call in the group call list of the source cell, and according to the The source cell identifier sends a fourth message to the source cell corresponding to the source cell identifier, where the fourth message carries information for indicating that the source cell releases the bearer of the group call, or carries the information indicating the source cell. Whether the information of the bearer type conversion of the group call is performed, wherein the information carried by the fourth message is determined by the MCE according to the group call list of the source cell, and the number of UEs participating in the group call is determined according to the participation Determining, by the number of UEs in the group, whether the source cell performs bearer type conversion of the group call or whether to perform bearer release of the group call;

After receiving the fourth message, the source cell releases the bearer of the group call that the UE participates according to the fourth message, or performs or does not perform the group call that the UE participates according to the fourth message. Bearer type conversion.

The source cell and the target cell all belong to the same MCE.
The method of claim 1 wherein said user group participating in said group call Before the UE sends a first message to the target cell during cell reselection, the standby UE further includes:

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

After receiving the fifth message, the source cell sends a sixth message to the associated MCE, where the sixth message carries the group identifier and the UE identifier of the group call that the UE participates in;

The MCE maintains a group call list of the source cell according to the group identifier and the UE identifier in the sixth message.
The method according to claim 2, wherein the fifth 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.