Buffer-based power allocation method for high-speed rail communication uplink energy efficiency optimization

Abstract

The present invention proposes a cache-based power allocation method for high-speed rail communication uplink energy efficiency optimization, comprising the following steps: power allocation strategy; setting Lagrangian multiplier range and energy efficiency iteration initial value; determining reachable channel capacity value; Calculate the amount of cached data; calculate the average transmit power and average channel capacity; optimize energy efficiency; optimize decisions. The advantage of the present invention is that it can dynamically allocate power according to the relationship between the real-time changing wireless transmission rate between the train and the base station and the constant data arrival rate at the access point on the train, that is, under the requirement of meeting the buffer area and the maximum transmission power Maximize system capacity, thereby improving overall system energy efficiency.

Description

technical field [0001] The present invention relates to a cache-based power allocation method for high-speed rail communication uplink energy efficiency optimization, specifically a power allocation method based on the cache at the access point on the train considering the energy efficiency optimization of the train to the base station uplink, belonging to Technical field of wireless communication technology. Background technique [0002] With the rapid development of high-speed railway, the wireless communication system of high-speed railway has attracted more and more attention. And with the continuous growth of user service demands, the service quality requirements for high-speed rail wireless communication systems are also getting higher and higher. However, high-speed mobility and high bandwidth requirements also bring extremely high energy consumption, so how to reduce the energy consumption of high-speed rail communication systems is also a problem worth exploring. ...

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Problems solved by technology

[0003] After searching, it was found that Hui Li et al. published in "IEEE Transactions on Communications, Volume62, Issue 2, Feb.2014, pp.638-647 (Institute of Electrical and Electronics Engineers Communications, February 2014, Volume 62, Issue 2, Pages 638-647) published an article titled "Energy Efficiency of Large-Scale Multiple Antenna Systems with Transmit Antenna Selection (energy efficiency of large-scale multi-antenna systems with transmit antenna selection)", which mainly proposed to transmit However, this paper does not consider the high-speed rail scenario; Chuang Zhang et al. in "IEEE Transactions on Vehicular Technology Jan.2015, pp.5775-5788 (Institute of Electrical and Electronics Engineers Vehicular Technology Transactions, 2015 1 Published on "Optimal Power Allocation With Delay Constraint for Signal Transmissions From a Moving Train to Base Stations in High-Speed ​​Railway Scenarios" on "Optimal Power Allocation With Delay Constraint for Signal Transmissions From a Moving Train to Base Stations in High-Speed ​​Railway Scenarios" Optimal Power Allocation)" which minimizes the transmit power by matching the data arrival rate at the access point with the wireless transmission rate, but does not achieve a more efficient transmission system capacity within the constraints of the maximum average power currently available Tao Li et al published a paper entitled "Service-Oriented Power Allocation for High-Speed "Railway Wireless Communications", this paper studies the time-domain power allocation algorithm based on quality of service to achieve the maximum achievable rate area for delay-sensitive flows and delay-insensitive flows. The shortcoming is that time fairness is not considered; Yunquan Dong et al. in "IEEE Transactions on Vehicular Technology, Volume 63, Issue 2, Feb.2014, pp.925-930 (Institute of Electrical and Electronics Engineers Vehicular Technology Transactions, 201 February 4, Volume 63, No. 2, Pages 925-930) published a paper entitled "High-Speed ​​Railway Wireless Communications: EfficiencyVersus Fairness (High-Speed ​​Railway Wireless Communications: Efficiency and Fairness)", which proposed the high-speed railway A power allocation method based on time fairness in the scenario, but this paper does not consider caching, which will cause the loss of user information on the train

However, neither of these two patents considered high-speed mobility, only traditional mobile communication scenarios

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