Method for optimal distribution of time of energy harvesting relay system based on relay selection

A technology that optimizes distribution and energy collection. It is applied in transmission systems, radio transmission systems, electrical components, etc. It can solve the problems of inconvenient charging or battery replacement, high cost overhead, and limited battery capacity, so as to improve system throughput performance and avoid Energy-wasting, wide-ranging effects

Active Publication Date: 2016-07-06
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] In traditional relay technology, the battery capacity of participating relay nodes is limited, frequen...

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  • Method for optimal distribution of time of energy harvesting relay system based on relay selection
  • Method for optimal distribution of time of energy harvesting relay system based on relay selection
  • Method for optimal distribution of time of energy harvesting relay system based on relay selection

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Embodiment Construction

[0028] The technical solution of the present invention is described in detail below in conjunction with embodiment and accompanying drawing:

[0029] The two-hop multi-relay system model of the present invention is as attached figure 2 As shown, it includes K relay nodes with energy harvesting function, denoted as R i , i=1,2,...,K, a source node S and a destination node D, both of which do not have the energy harvesting function. Due to physical obstacles and other reasons, there is no direct transmission link between the source node and the destination node, and K relay nodes with limited energy use the amplification and forwarding protocol to help the source node S forward information to the destination node. All relay nodes work in half-duplex mode and cannot receive and transmit information at the same time. The signal sent by the source node is the only source of energy for the relay node, so the relay node uses wireless energy transfer technology (WET) to charge its ...

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Abstract

The invention aims at a multi-relay system with an energy harvesting function and provides a method for optimal distribution of time of an energy harvesting relay system based on relay selection. In the method, a plurality of relay nodes work under an energy harvesting mode of wireless energy transmission (WET), an optimization model with maximum system end-to-end throughput is constructed based on the limitations of energy causality and data causality, and a branch and bound method is adopted to select the relay node used by each time slot. A simplex method and an independent solution method are respectively adopted to carry out optimal distribution on the transmission time of the source node and the relay node in each time slot for different service conditions of the relay node about the residual energy, so that the data quantity received by the target node is improved. According to the method, pairing of the relay node and the transmission time slot during multi-relay cooperation and optimal distribution of the transmission time of the source node and the relay node are realized, so that the system throughput performance is effectively improved, and the method has an advantage that the energy consumption expenditure is saved.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to an energy collection-based multi-relay network resource allocation method. Background technique [0002] With the rapid development of wireless communication technology, the future wireless communication network will be a heterogeneous network supporting multiple wireless communication systems to provide higher transmission rates and more reliable transmission performance. In the context of increasingly tight spectrum resources, multi-antenna systems have received extensive attention because they can significantly improve system transmission performance and spectrum efficiency. [0003] As an extension of multi-antenna technology, cooperative communication is mainly realized through relay technology. Its basic idea is to use the broadcasting characteristics of radio waves, and different users share each other's antennas to form a virtual MIMO system. Diversi...

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Application Information

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IPC IPC(8): H04W72/04H04B7/155H04W24/02
CPCH04B7/15592H04W24/02H04W72/0446
Inventor 朱琦王皓
Owner NANJING UNIV OF POSTS & TELECOMM
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