User grouping and resource allocation method for wireless relay network

Abstract

The invention discloses a user grouping and resource allocation method for a wireless relay network, which is applied to a multi-user uplink multi-address access relay communication system. In each TTI (Transmission Time Interval), users activated in cells are scheduled, and the users are divided into a base station service area group, a relay service area group and a mixed service area group according to the average received power information of downlink pilot signals received by the activated users. System available resources are allocated to each user group, the resources acquired by each group form a resource set corresponding to the user group, and different resource allocation modes can be adopted for different user groups. Different priorities are set for each user group, and resources are preferentially allocated to the users in the user group with a high priority; and when the resources in the resource set of the user group with a high priority are insufficient, the shared resources of a user group which has a low priority and is adjacent to the user group with a high priority are allocated to the users in the user group with a high priority.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for user grouping and resource allocation used in a wireless relay network. Background technique [0002] The LTE (Long Term Evolution, long-term evolution) system is the evolution of 3G (3rd Generation, third-generation mobile communication system). LTE improves and enhances the air access technology of 3G, and adopts OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division Multiplexing) and MIMO (Multiple Input Multiple Output) are the only standards for wireless network evolution. LTE can provide a peak rate of downlink 100Mbit / s and uplink 50Mbit / s under 20MHz spectrum bandwidth, which improves the performance of cell edge users, increases cell capacity, and reduces system delay. Among them, the technical characteristics of LTE include high data rate, packet transmission, low delay, wide area coverage and backward compatibility. With t...

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Problems solved by technology

[0011] The relay device only assists users with poor channel conditions on the direct link to forward information. The resource utilization rate and ergodic capacity are low, and the maximum rate transmission of user information cannot be achieved. When scheduling, the base station scheduler only bases the direct link from the user to the base station. User selection is performed based on the channel state information of the relay device, without considering the influence of the link status of the relay device on the user transmission performance. Users at the edge of the cell are still difficult to be served, resulting in low transmission efficiency of the entire network

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