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A power allocation method for d2d users to share spectrum with cellular users

A technology of cellular user and allocation method, applied in the field of D2D communication, can solve the problems of cellular user interference, affecting reception performance, etc., and achieve the effect of improving the speed and speed

Active Publication Date: 2020-01-07
白盒子(上海)微电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when multiplexing cellular resources, cellular users and D2D transmitters will cause interference to each other, affecting each other's receiving performance

Method used

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  • A power allocation method for d2d users to share spectrum with cellular users
  • A power allocation method for d2d users to share spectrum with cellular users
  • A power allocation method for d2d users to share spectrum with cellular users

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Embodiment Construction

[0023] The network diagram of this embodiment is as follows figure 1 As shown, N cellular user pairs and K D2D user pairs multiplex downlink channel resources. use Represents the set of cellular users, and the set of all D2D user pairs is Let p k,n , at this time, the SINR obtained by the D2D user pair on channel n is

[0024]

[0025] in, is the channel response of D2D users to k on channel n, is the channel response coefficient of D2D user pair l to D2D user pair k on channel n, is the cellular user interference from the base station (where is the interference channel between base station and D2D user pair k, q n is the transmit power of the base station to cellular user n). Thus, the achievable data rate of the D2D user for k is Similarly, the SINR of cellular user n is

[0026]

[0027] in is the interference to l from D2D users sharing channel n, q n is the transmit power of the base station to cellular user n, g n is the channel response from t...

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Abstract

The invention discloses a power allocation method for spectrum sharing by a D2D user pair and a cellular user. The method comprises a first step of initializing iteration times, p<k,n><(0)> and a lagrange multiplier; a second step of calculating an allocation power q<n><(i)> of the cellular user; a third step of performing first-order convex approximation on a data rate R<k> of the D2D user pair and then simplifying according to q<n><(i)>; a fourth step of updating an allocation power p<k,n><(i+1)> and the lagrange multiplier by using a gradient decent method according to a formula obtain after the first-order convex approximation and simplification of p<k,n><(i) and R<k>; and a fifth step of determining whether the lagrange multiplier is converged, if yes, using an allocation power matrix obtained in current calculation as a final allocation power, if not, returning i=i+1 and executing the second step. The method is less complex.

Description

technical field [0001] The present invention relates to D2D communication technology in the field of 5G communication, and in particular to a power allocation method for D2D users to share frequency spectrum with cellular users. Background technique [0002] In order to cope with the rapidly increasing traffic in the core network, 3GPP proposes D2D communication technology as one of the key technologies in the future 5G communication system. Its core idea is to allow users in the cell to communicate directly without going through the base station, thereby effectively offloading the transmission load from the cellular network. [0003] Due to the short-distance feature of D2D communication technology, D2D users can perform channel multiplexing with distant cellular users and share the same frequency spectrum, thereby increasing system capacity and improving wireless resource utilization efficiency. However, when cellular resources are multiplexed, the cellular user and the D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/70H04W28/22H04W72/04
CPCH04W28/22H04W72/0473
Inventor 陈明潘怡瑾
Owner 白盒子(上海)微电子科技有限公司
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