Method for adjusting power of ultra-dense heterogeneous network by combining Lagrange duality with improved particle swarm

A technology for improving particle swarm and power adjustment, which is applied in power management, wireless communication, electrical components, etc., and can solve problems such as interference coordination

Inactive Publication Date: 2015-05-20
SOUTHEAST UNIV
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Problems solved by technology

This method jointly adjusts the transmit power of all small stations to solve the interference coordination problem in ultra-dense heterogeneous networks

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  • Method for adjusting power of ultra-dense heterogeneous network by combining Lagrange duality with improved particle swarm
  • Method for adjusting power of ultra-dense heterogeneous network by combining Lagrange duality with improved particle swarm
  • Method for adjusting power of ultra-dense heterogeneous network by combining Lagrange duality with improved particle swarm

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Embodiment Construction

[0074] In the present invention, an ultra-dense heterogeneous network power coordination method based on Lagrangian duality and improved particle swarms is given by taking the LTE-A system as an example:

[0075] Such as figure 1 described, including the following steps:

[0076] Step 1: collect network information, initialize parameters: collect the number M of macro stations, the number ρ of small stations and the number K of users in the network; record the set of stations as C={C m ,C s}, where the set of macro stations C m ={m 1 ,m 2 ,...,m M}, waypoint set C s ={s 1 ,s 2 ,...,s ρ}; The user's quality of service requirement is the minimum rate requirement R min ;Initialize the total number N of small station candidate transmission power sets, the maximum number of iterations t max , the maximum number of reinitializations t res , the local search radius adjustment factor δ>1; initialize the current iteration number t=0, the current reinitialization number s=0,...

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Abstract

The invention provides a low-complexity method for coordinating power of a down link of an ultra-dense heterogeneous network, which combines Lagrange duality with an improved particle swarm by taking network throughput maximization as the goal under the conditions that user service cells are changed along with cell sending power and the demand of user service quality is guaranteed. The sending power of all small stations is adjusted jointly by the method, so the interference coordination problem in the ultra-dense heterogeneous network is solved; the method comprises the following steps of solving second-best solutions of small station sending power sets when the service cells are fixed by the Lagrange duality; then, introducing the Lagrange second-best solutions into initial particles of the improved particle swarm in consideration of the changes of the service cells, and searching the optimal small station sending power set by utilizing the improved particle swarm. Benefit from the Lagrange duality, the method is capable of lowering the number of iterations and computation complexity, and thus, the bet power set can be rapidly found; benefit from the improved particle swarm, the method is capable of effectively solving the power adjustment problem brought by the fact that the user service cells are changed along with power adjustment.

Description

technical field [0001] The invention belongs to the technical field of wireless resource management in mobile communication, and in particular relates to a method for adjusting downlink power of an ultra-dense heterogeneous network based on Lagrangian duality and improved particle swarm in a wireless communication system. Background technique [0002] An ultra-dense heterogeneous network in which low-power small cells are densely deployed at the same frequency within the coverage area of ​​macro cells is a method proposed by 3GPP (Third Generation Partnership Project) LTE-A (Long Term Evolution-Advanced) to improve spectrum utilization and network efficiency of 5G networks. effective method for capacity. However, the increase in the density of small stations will bring about an increase in the level of network interference. An effective interference coordination technique is to coordinate the inter-cell interference by adjusting the transmission power of the small station, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/14H04W52/30H04W52/26
CPCH04W52/143H04W52/265H04W52/30
Inventor 潘志文蒋慧琳刘楠尤肖虎
Owner SOUTHEAST UNIV
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