Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 49 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the number of devices in the D2D cluster, the signaling overhead and system delay of the existing scheme will be greatly increased, which will be unbearable for the base station

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04W28/16H04L1/16
Inventor 周斌王海峰徐景
Owner SHANGHAI RES CENT FOR WIRELESS COMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com