Distributed resource allocating method in multi-cell relay OFDMA system

A distributed resource and allocation method technology, applied in the field of physical layer resource allocation, can solve the problems of complex iterative process of dual decomposition and ellipsoid method, increased signaling interaction between cells, large signaling and computing overhead, etc., to achieve high utilization value, low time complexity, and the effect of reducing signaling overhead

Active Publication Date: 2013-07-24
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0026] (3) The power allocation process in this literature is complex, and the optimality is difficult to control
[0035] This makes the subsequent dual decomposition and ellipsoid method iteration process more complicated, and the signaling interaction between ce

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  • Distributed resource allocating method in multi-cell relay OFDMA system
  • Distributed resource allocating method in multi-cell relay OFDMA system
  • Distributed resource allocating method in multi-cell relay OFDMA system

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[0052] The specific implementation is further described below in conjunction with the drawings.

[0053] The present invention is a low-complexity distributed resource allocation scheme under a relay-based multi-cell OFDMA system. The optimization model is firstly given below.

[0054] 1. Build a mathematical model

[0055] In order to avoid interference in the cell, it is assumed that any subcarrier in the cell is only allowed to be occupied by one relay or user at the same time. Record the power allocated by the base station of the l cell for relay m on subcarrier n as Then the capacity of the first hop of the downlink can be written as:

[0056] R l , m n = log 2 ( 1 + p l , m n | H l , m l ( n ) | 2 σ 2 + I l , m n ) - - - ( 1 )

[0057] Where in the denominator Co-channel interference from other cells that the relay m of this cell suffers on subcarrier n:

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Abstract

The invention provides a low-complexity distributed resource allocating method in a multi-cell relay OFDMA system. The method mainly comprises the steps of self-adaptation carrier wave allocation and water injection power allocation, wherein the self-adaptation carrier wave allocation and the water injection power allocation are conducted in an alternating and iterative mode till algorithm convergence is completed. In the stage of the power allocation, an iterative multi-plane water injection method is provided, and different water injection planes are adjusted so that maximization of volume is achieved. In the prospect of fairness of a system, flexible coverage to users in any level can be achieved, and differentiated service can be provided according to precedence levels of the users. The low-complexity distributed resource allocating method is quick in convergence, and system capacity is improved.

Description

technical field [0001] The invention relates to a physical layer resource allocation technology for a relay-based multi-cell OFDMA cellular network, belonging to the technical field of mobile communication. Background technique [0002] With the rapid development of mobile Internet services, people urgently need more efficient wireless technology, so both Orthogonal Frequency Division Multiplexing (OFDM) and wireless relay technology have come into people's sight. OFDM technology is known for its efficient spectrum utilization, and relay technology can better solve the coverage problem of remote cells. The combination of these two technologies has been given great expectations as the key technology of the next generation mobile system. [0003] It is generally believed that as long as the subcarriers are reasonably allocated in a single cell, the interference between users can be avoided theoretically. However, in a cellular network with multiple cells, there is bound to be...

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Application Information

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IPC IPC(8): H04L5/00H04W16/14
Inventor 朱琦吕林输
Owner NANJING UNIV OF POSTS & TELECOMM
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