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Modulation and coding scheme (MCS) selecting method in wireless trunked communication system

A wireless cluster communication and group technology, which is applied in the field of MCS selection, can solve problems affecting cluster capacity, multiple resources, and system occupation, and achieve the effects of saving system resources, improving data transmission efficiency, and ensuring data demodulation performance

Inactive Publication Date: 2015-05-27
CHENGDU TD TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, if all users are in the center area of ​​the cell, choosing a lower MCS takes up more system resources, which is a waste of system resources and affects the cluster capacity; If a higher MCS is selected, the demodulation performance at the edge of the cell will be poor, affecting user experience
[0005] Based on the above problems, the MCS selection of cluster monitoring users is usually lower in order to take care of the coverage of the edge. If there are no cluster users at the edge, a lower MCS is a waste of system resources and will reduce the capacity of the system.

Method used

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  • Modulation and coding scheme (MCS) selecting method in wireless trunked communication system
  • Modulation and coding scheme (MCS) selecting method in wireless trunked communication system
  • Modulation and coding scheme (MCS) selecting method in wireless trunked communication system

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Experimental program
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Embodiment 1

[0043] In this embodiment, the current most popular LTE-based broadband trunking communication system is taken as an example. When co-frequency networking is adopted, cell edge interference is serious and demodulation performance is not good, so lower-order MCS should be used to send data. In this case, the A3 event (the signal quality difference between the neighboring cell and the serving cell reaches the set threshold) is used to determine the cell edge.

[0044] figure 2 It is a specific flowchart of the MCS selection method in the first embodiment. Such as figure 2 As shown, the method includes:

[0045] Step 201: When the group service is initiated, the base station sends data to the group users with an MCS greater than or equal to the first set order.

[0046] Step 202: The base station issues an A3 measurement event.

[0047] In step 203, the UE performs A3 measurement, that is, measuring the signal quality difference between the neighboring cell and the serving cell, and w...

Embodiment 2

[0050] In this embodiment, the current most popular LTE-based broadband trunking communication system is still taken as an example. When the single-cell networking has no neighboring cells or inter-frequency networking, the A2 event (the signal quality of the serving cell is lower than the set threshold) is used as an example. It is judged to reach the edge of the cell.

[0051] image 3 It is a specific flowchart of the MCS selection method in the second embodiment. Such as image 3 As shown, the method includes:

[0052] Step 301: When the group service is initiated, the base station sends data to the group user with an MCS greater than or equal to the first set order.

[0053] Step 302: The base station issues an A2 measurement event.

[0054] In step 303, the UE performs A2 measurement, that is, measures the signal quality of the serving cell, and when the quality is lower than a set threshold, it reports an A2 measurement report to the base station.

[0055] Step 304: After rec...

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Abstract

The invention discloses a modulation and coding scheme (MCS) selecting method in a wireless trunked communication system. The method comprises the steps that when a cluster service is initiated, a base station sends data to users in a cluster through the MCS greater than or equal to a set order; in the process of carrying out the cluster service, when the base station determines that the cluster has a monitoring user at the edge of a cell, the MCS order of the cluster is lowered for data transmission if the MCS order of a current cluster is greater than or equal to the set order. The MCS selecting method can save system resource as much as possible while meeting the requirement of demodulation performance of the users in the cluster.

Description

Technical field [0001] This application relates to communication technology, and in particular to an MCS selection method in a wireless trunking communication system. Background technique [0002] With the continuous development of wireless communication technology, the trunking communication technology has continuously developed from the analog system in the 1960s, and the narrowband digital trunking system appeared in the 1990s. At the same time, with the gradual increase in the demand for wireless broadband by industry users, from the previous only requiring voice intercom to the current one, not only clear voice calls but also high-speed data transmission are required. In order to meet the needs of industry users, the traditional trunking system will continue to evolve towards broadband. [0003] Since the data in the trunking system is broadcast to group users, different modulation and coding methods (MCS) can be selected when sending data to improve data transmission perform...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04W24/00
CPCH04L1/0003H04L1/0009H04W24/10
Inventor 程浩王亮方伟张光伟
Owner CHENGDU TD TECH LTD