Resource allocation method for D2D (Device-to-Device) communication in cellular network and system

Abstract

The invention belongs to the field of wireless communication networks, and discloses a resource allocation method for D2D (Device-to-Device) communication in a cellular network and a system. The resource allocation method comprises the following steps: deciding whether to perform clustering or not according to the quantity of cellular users and the quantity of D2D users, and applying a distance-based clustering way if clustering is needed; sequentially selecting the D2D users to serve as master D2D users for executing a resource allocation way based on minimum interference together with the cellular users; and lastly, updating clusters, removing the D2D users who do not satisfy an interference condition from the clusters, performing communication with orthogonal resources, and calculatinga matching way with maximum throughput. The cellular users with minimum interference are always selected for the D2D users in each iteration, and a matching combination with maximum throughput is selected, thereby not only reducing the system interference, but also increasing the user throughput and the access number. A plurality of pairs of D2D users multiplex one cellular user, so that the spectrum utilization ratio is increased greatly.

Description

Technical field [0001] The invention belongs to the field of wireless communication networks, and in particular relates to a resource allocation method and system for D2D communication in a cellular network. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: [0003] Due to the limited number of users that can be accommodated in a cellular network, it is very easy to be unable to communicate or to be interrupted during user communication in densely populated places. In the traditional cellular network, if two communication users want to establish a connection, they must pass through the base station as a relay. This will not only increase the load of the base station, but also reduce the communication quality. In order to meet the communication needs of more users, direct terminal connections are widely used. development of. [0004] D2D communication technology, also known as terminal direct connection technology, as a sh...

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Problems solved by technology

[0006] (1) In the prior art, D2D users reuse cellular users to interfere with each other. Without clustering D2D users with long distances and multiplexing each cluster with different cellular user resources, the system throughput cannot be significantly improved and the System interference, and there is more complex interference in the many-to-one distribution system

[0007] (2) In the prior art, because the many-to-one resource allocation method is too complicated, most studies focus on the multiplexing method in which a pair of D2D users reuse a cellular user resource

This allocation method is only suitable for a small number of D2D communication users in the network. Once the number of D2D communication users increases to a certain extent, a large number of D2D users will not be able to access the cellular system.

[0008] (3) In the prior art, the many-to-one resource allocation method does not make a good trade-off between complexity and system performance

It often leads to higher complexity in order to improve system performance, or worse system performance in order to reduce complexity

[0009] (4) In the prior art, the resource allocation algorithm of D2D communication does not guarantee the service quality of D2D users and cellular users at the same time

[0011] The difficulty of the D2D resource allocation method is that D2D users and cellular users share a channel resource. At present, the technology for multiple users to share the same frequency band in the cellular system is not yet mature, because it will cause serious co-channel interference.

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