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Virtual MIMO communication method based on terminal direct connection

A virtual multiple-input multiple-output and communication method technology, which is applied in the field of virtual multiple-input multiple-output communication, can solve the problems of D2D communication distance not being too large, called users unable to be found, mutual interference, etc.

Active Publication Date: 2014-02-12
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The proposal of D2D technology brings new problems: D2D communication needs to be established on the basis of base station control, and the calling user cannot find the called user itself, so it needs the assistance of the base station, and the base station allocates appropriate resources to it; When D2D and cellular have the same resources, the multiplexed cellular users occupy the same resource (time or frequency) as D2D communication, which makes the two communications interfere with each other; the size and power consumption of user equipment limits the distance of D2D communication. too big
However, in practical applications, mobile phones are only suitable to be equipped with a single antenna due to problems such as power consumption and volume.

Method used

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  • Virtual MIMO communication method based on terminal direct connection
  • Virtual MIMO communication method based on terminal direct connection
  • Virtual MIMO communication method based on terminal direct connection

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Embodiment 1

[0026] like image 3 As shown, the present invention provides a virtual multiple-input multiple-output communication method based on terminal direct communication. The method is a method in which when cellular users and D2D users coexist, communication users use D2D links to construct virtual MIMO communication clusters to obtain diversity gain. . The invention includes a D2D virtual MIMO establishment signaling process, and provides an implementation scheme for constructing virtual MIMO under a cellular system. According to different locations of collaborative users, two different collaboration modes are analyzed, which has practical value.

[0027] The process flow of the method for establishing D2D-based virtual MIMO communication under the cellular system is as follows:

[0028] Step 1: S initiates a message of paging D to the base station;

[0029] Step 2: The base station finds that S and D are located in the same area (cell), and the base station broadcasts a D2D det...

Embodiment 2

[0038] 1. D2D virtual MIMO model

[0039] figure 1 is a virtual MIMO communication model, in the figure S is the session requester, and D is the destination. S, D want to establish a session connection, but the direct link between the two cannot meet the communication requirements (but the distance from the target value is not far away). There are several idle users around S and D. S and short-distance idle users S1, S2...Sn form a sending virtual antenna array, which we call a sending cluster, and D and D1, D2...Dn form a receiving antenna array, a receiving cluster. The sending cluster multiplexes the resources of the cellular user C-UE1, and the receiving cluster multiplexes the resources of the cellular user C-UE2. The receiving cluster and the transmitting cluster use dedicated resources to reduce interference.

[0040] 2. Inter-cluster communication

[0041] 2.1 Alamouti virtual MIMO communication based on decoding

[0042] Orthogonal space-time codes are used to c...

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Abstract

The invention discloses a virtual MIMO communication method based on terminal direct connection. According to the method, good channels can be acquired based on the short distance characteristic of terminal direct connection technologies, fading is small, and data forwarding expenditure of a base station is not avoided. D2D terminal cooperative communications are adopted, idle users around a communication terminal are used as auxiliary antennae of the communication terminal, and virtual MIMO is formed to transmit Alamouti space-time codes and acquire diversity gain; due to the limitation of power dissipation per unit volume, a plurality of antennae can not be integrated at an actual terminal easily; a virtual antenna array for the terminal can be formed through the users around the terminal based on the D2D technology, the good channels can be acquired because the terminal is close to the peripheral idle users, and accordingly signals can be transmitted like being transmitted from the same terminal; meanwhile, at a receiving end, the performance of a system can be further improved by forming a receiving array through peripheral idle users.

Description

technical field [0001] The invention relates to the technical field of computer communication, in particular to a virtual multiple-input multiple-output communication method based on terminal direct connection. Background technique [0002] Device-to-Device (D2D) communication technology is a communication method in which two users establish a direct link during the communication process without forwarding through the base station. D2D communication can reduce the burden brought by the base station due to forwarding data, and can enable D2D communication users to reuse traditional cellular user resources in the cell to improve resource utilization, thereby improving the throughput of the entire cell. The proposal of D2D technology brings new problems: D2D communication needs to be established on the basis of base station control, the calling user cannot find the called user itself, so the base station needs to assist, and the base station allocates appropriate resources to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06
Inventor 邵世祥姜浩孙君
Owner NANJING UNIV OF POSTS & TELECOMM
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