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Method, device and system for late entry into group call in idle state

A technology of group call and system information block, which is applied in the field of LTE trunking system to achieve the effect of reducing the interruption and delay of group call service

Inactive Publication Date: 2019-02-22
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the LTE broadband trunking communication system, there is a problem with the continuity of the trunking group call service when the trunking users are moving, especially when crossing cells.

Method used

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  • Method, device and system for late entry into group call in idle state
  • Method, device and system for late entry into group call in idle state
  • Method, device and system for late entry into group call in idle state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: The system reserves the preamble and maps it with the group call; the UE judges that the target cell has a group call, please refer to the attached image 3 .

[0054] Step 1: First, reserve n Preambles in the dedicated Preamble, for example=5, which are dedicated for cluster user cell reselection. The number of reserved Preambles may not be reflected in the system broadcast, and the reserved Preambles may be a type of dedicated Preambles. The base station will not allocate the reserved Preamble to the target UE during the non-contention random access process.

[0055] The eNB allocates the reserved Preamble to the ongoing group call in the cell, stores the one-to-one mapping between the reserved Preamble ID index and the group call ID, and broadcasts the mapping relationship between the reserved Preamble and the group call ID in the system broadcast, here The system broadcast can be SIB1, a cluster SIB, or a newly defined SIB.

[0056] Step 2a: The map...

Embodiment 2

[0061] Embodiment 2: The system reserves the preamble and maps it with the group call; the UE judges that the target cell does not have the group call it is in. For specific processing, please refer to the attached Figure 4 .

[0062] Steps 1-2: Similar to Embodiment 1, the difference is that the UE determines that there is no group call in the target cell.

[0063] Steps 3-12: UE selects a non-reserved preamble for contention random access, and initiates a TAU process.

[0064] In order to further reduce the time delay for the UE in idle state to enter the group call later, for the processing of step 3 and after in Embodiment 2, the following optimization processing can be performed, please refer to Example 3 and Embodiment 4.

Embodiment 3

[0065] Embodiment 3: Please refer to the attached Figure 5 , carry the group call ID in the RRC connection establishment request message.

[0066] Steps 1-4: After cell reselection, the UE performs contention random access in the target cell, initiates the TAU process, and at the same time carries the group call ID of the UE in the original cell in the RRC connection establishment request message.

[0067] Step 5: After receiving the group call ID, the eNB makes a judgment: if the group call has been established in the cell of the eNB, then go to steps 6a, 7 and 8, and perform late entry processing of the group call, that is, in the latest paging Send group paging and configuration information on resources. At the same time, an RRC reject message is sent to the UE.

[0068] If the group call does not exist in the cell of the eNB, go to steps 6b, 7 and 8, and use the TAU process to expand the group call.

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Abstract

The invention provides a method for lagged group calling entrance of IDLE-state UE. The method comprises: an eNB reserves one or more preambles, one-to-one mapping binding between all reserved preambles and unique identifiers of all group calling that is being carried out is carried out, and the mapping relation is broadcasted in a system broadcast; UE obtains a mapping relation between a reserved preamble and group calling at a target cell, gets information that the group calling is being carried out at the target cell, and initiates random access by the preamble corresponding to the group calling; and the eNB receives and detects the reserved preamble and issues a paging message of the corresponding group calling as well as group calling configuration information according to the mapping relation. Therefore, occurrence of group calling service interruption and time delay of an IDLE user during the cell reselection process can be reduced.

Description

technical field [0001] The present invention relates to an LTE trunking system, in particular to a method, device and system for a UE in an IDLE state to enter a group call later. Background technique [0002] The trunking communication system has become a vital special communication system besides the public mobile communication system. Because of its command and dispatch and emergency features (such as one-button intercom, emergency call and multi-group dispatch, etc.), it has been widely used in many important industries including the army, airport, public security, railway and electric power. application. [0003] Although the trunking communication system is in an extremely important position, compared with the public mobile communication, there are many problems in the trunking communication system in terms of scale, standard, openness, compatibility and other aspects. [0004] With the development of public network wireless communication technology, people put forwa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/10H04W74/08H04W76/40
Inventor 王淑坤郑伟许瑞锋
Owner BEIJING XINWEI TELECOM TECH