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Information retransmitting method for improving multicast efficiency of cellular system

A cellular system, high-efficiency technology, applied in the field of cellular system multicast data transmission, can solve the problems of wireless resource waste, throughput decline, etc.

Inactive Publication Date: 2014-02-05
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, only one low-quality D2D link will cause the throughput of multicast in the entire D2D cluster to drop greatly, which is actually a waste of wireless resources

Method used

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  • Information retransmitting method for improving multicast efficiency of cellular system
  • Information retransmitting method for improving multicast efficiency of cellular system
  • Information retransmitting method for improving multicast efficiency of cellular system

Examples

Experimental program
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Embodiment Construction

[0050] The present invention will be described in detail below through specific examples.

[0051] See figure 2 and image 3 , the cellular system adopted by the information retransmission method for improving the multicast efficiency of the cellular system in the present invention is as follows: figure 2 As shown, the cellular system includes a base station (BS) and mobile devices 1 to 7 within the jurisdiction of the base station. The mobile devices 1 to 7 receive the same multicast data from the base station to form a D2D cluster.

[0052] Step 1: The mobile devices 1 to 7 in the cellular system perform channel measurement among each other, and feed back the measurement results to the base station (BS), so that the base station can determine two-by-two based on the feedback information. Spectrum utilization among devices.

[0053] Step 2: The base station (BS) in the cellular system broadcasts the multicast data, and determines the devices that have successfully receiv...

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PUM

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Abstract

A message retransmission method for improving multicast efficiency in cellular system is provided in the present invention. First, each of the devices performs channel measurement with one another so that the spectrum utilization between every two devices can be determined. Then a base station transmits multicast data to determine the devices which have received the multicast data successfully and the devices which have not received the multicast data. Then according to the spectrum utilization, the amount of the devices which have received the multicast data successfully, the amount of the devices which have not received the multicast data, and the preset retransmission source selection principle, the base station groups the devices and calculates resource overhead, and selects the device which has the least resource overhead to be the retransmission source of the multicast data, meanwhile records the corresponding grouping mode, and the base station transmits the information of the device determined to be the retransmission source and the grouping information to every device in the serving area of the base station. The device selected to be the retransmission source can be enabled to retransmit the received multicast data by orthogonal resource. Thereby the multicast efficiency is improved.

Description

technical field [0001] The invention relates to a cellular system multicast data transmission method, in particular to an information retransmission method for improving cellular system multicast efficiency. Background technique [0002] In the current infrastructure-based cellular mobile communication network, the base station (BS), as the central control node, is the only access point for mobile devices to obtain network services. All mobile devices can only communicate with a specific base station in the network through the uplink or downlink channel of the cellular system. However, when multiple mobile devices are close to each other, supporting direct communication (D2D: device-to-device, device-to-device) between mobile devices will bring many benefits to the existing cellular communication. These benefits include: longer device battery life, more efficient use of radio resources, greater signal coverage, and lower system interference levels. In recent years, the use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/06H04W24/08H04L1/18
CPCH04L1/1887H04L2001/0093H04L1/1825H04W72/005H04L2001/0097H04W28/04H04W72/30
Inventor 周斌徐景王海峰
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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