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Interference-alignment-based power control method for D2D user

A technology of interference alignment and power control, applied in the field of power control of D2D users, which can solve the problems of not considering the throughput of D2D users, and not considering the throughput of D2D users.

Inactive Publication Date: 2016-06-15
SHANGHAI NORMAL UNIVERSITY
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Problems solved by technology

[0007] Udesh Oruthota et al. (Udesh Oruthota and Olav Tirkkonen, "I / QInterference in Device-to-Device Underlay Communication with Uplink Power Control," Vehicular Technology Conference (VTC Spring), IEEE81st, 2015, pp:1–5) considered that the CU network and the D2D user network share orthogonal spectrum resources in an independent fan-shaped cell communication model, a Fractional power control (FPC) method is proposed to effectively reduce the interference of D2D users to the CU, but this method does not consider the throughput of D2D users
[0008] From the perspective of existing technologies, various power control methods only guarantee the throughput of CU, but do not consider the throughput of D2D users

Method used

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  • Interference-alignment-based power control method for D2D user

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Embodiment

[0043] refer to figure 1 In a certain cell of the cellular network system, there are 3 (L=3) D2D users 1 and 2 (K=2) CU2s. The D2D users do not need to communicate directly through the base station, and both CU communication and D2D communication are in working state. The bandwidth of each CU is 10MHz (W=10MHz), and each CU node is a single antenna; the number of transmitting antennas and receiving antennas of each D2D user is 2 (M R = M T =2); the symbol length of each D2D user transmission data is the same as 1, that is, n=1; according to the wireless local area network standard IEEE802.11a, when the idle frequency band of the cellular network is divided into 64 (D=64) subcarrier frequency bands, each The bandwidth of the sub-carrier frequency band is 0.3125MHz (Δf=0.3125MHz), and it is stipulated that when the interference generated by the D2D user to the CU is less than the maximum interference threshold When , D2D users can use the idle frequency band of the cellular n...

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Abstract

The invention provides an interference-alignment-based power control method for a D2D user. Interference alignment pre coding is carried out on a D2D user sending terminal signal and interference suppression is carried out on a signal of a D2D user receiving terminal; an interference value to a certain CU by the D2D user is compared with an interference threshold value of a system; a total transmission power of each D2D user is compared with a maximum power that is set by the system and is allowed to be used for each D2D user; and under the limitation circumstance that the interference value is not larger than a threshold value and the total transmission power is not larger than the maximum power set by the system, the rate sum of all D2D users on a sub carrier wave can be maximized and a transmission power of each D2D user on each sub carrier wave is obtained. With the method, the interference between the D2D users can be eliminated by using an interference alignment precoding method; and optimized distribution of powers of the D2D users on sub carrier waves is realized, so that the rate sum of the D2D user system can be maximized.

Description

technical field [0001] The present invention relates to a power control method in the technical field of cellular network system communication, in particular to a power control method for D2D users based on interference alignment. Background technique [0002] With the rapid development of wireless cellular network communication technology, people's demand for wireless spectrum resources is increasing, resulting in increasingly tight wireless spectrum resources, which makes the requirements for spectrum efficiency higher and higher. Device-to-Device (D2D) communication technology is applied to the cellular network system, so that adjacent users in the cellular network system can directly communicate with each other without using a base station (BS), which improves the overall spectrum efficiency of the network and allows the network to accept more More users, improve network capacity. [0003] The initial motivation for introducing D2D communication in the cellular network ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04W4/00H04W72/04
CPCH04B7/0456H04W4/70H04W72/0473Y02D30/70
Inventor 王珍李莉龚帅江楠
Owner SHANGHAI NORMAL UNIVERSITY
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