Device-to-device (D2D) cluster data sharing method under cellular environment

A technology of data sharing and environment, which is applied in the direction of error prevention/detection, network traffic/resource management, electrical components, etc. by using the return channel. It can solve the problems of signaling overhead and system delay increase, so as to reduce the number of retransmissions, The effect of shortening system delay and saving related signaling overhead

Inactive Publication Date: 2012-02-01
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the increase of the number of devices in the D2D cluster, the signaling overhead and system...

Method used

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  • Device-to-device (D2D) cluster data sharing method under cellular environment
  • Device-to-device (D2D) cluster data sharing method under cellular environment
  • Device-to-device (D2D) cluster data sharing method under cellular environment

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Experimental program
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Embodiment 1

[0042] This embodiment provides a method for sharing data in a D2D cluster in a cellular environment, and the method includes the following four steps:

[0043] 1. Get the PEM matrix

[0044] Before the retransmission in the D2D cluster starts, a PEM matrix needs to be generated first. There are two ways to obtain the PEM matrix: centralized and distributed. For centralized, the complete PEM matrix is ​​generated at the base station side; for distributed, the complete PEM matrix is ​​generated at the mobile device side within each D2D cluster. The process of obtaining the PEM matrix is ​​described as follows (here, D2D ACK / NACK specifically refers to the ACK / NACK signal fed back from multiple receivers multicast within the D2D cluster):

[0045] centralized:

[0046] 1) After each multicast in the D2D cluster, the base station monitors the D2D ACK / NACK fed back from multiple receivers, or the transmitter of the multicast in the D2D cluster monitors the D2D ACK / NACK, and the...

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Abstract

The invention discloses a device-to-device (D2D) cluster data sharing method under a cellular environment. The method comprises the following steps that: step1. before D2D cluster retransmission begins, each mobile equipment in the D2D cluster firstly acquires a packet error matrix (PEM) which belongs to the mobile equipment itself; step 2. a retransmission gain factor of the each mobile equipment in the D2D cluster is calculated; step 3. the mobile equipment with the highest retransmission gain factor is taken as a transmitter in the D2D cluster retransmission; step 4. the transmitter retransmits a data packet needed to be retransmitted in the cluster and updates the PEM of the each mobile equipment; step 5. if the updated PEM still contains a ''0'' element, the step 1 to the step 4 are repeated till the PEMs of all the mobile equipment in the D2D cluster are ''1'' matrixes. In the method of the invention, through effectively reducing retransmission times in the D2D cluster, related signaling costs of D2D communication under the cellular environment can be substantially saved and simultaneously system time delay can be shortened. The method is beneficial to realization of a real time multimedia service.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a data sharing method in a D2D cluster in a cellular environment. 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 between mobile devices (D2D: device-to-device, device-to-device) will bring many benefits to traditional 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 of D2D communication technology to enhance...

Claims

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Application Information

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IPC IPC(8): H04W28/16H04L1/16
Inventor 周斌王海峰徐景
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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