NOMA Power Allocation by Code Word Length for Interference Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing delays and interference when multiple terminals transmit signals with non-orthogonal multiple access, particularly due to varying code word lengths and propagation losses, leading to inefficient signal reception and decoding.
Innovation Solution
A transmission control method that adjusts the transmitting power of each terminal based on its code word length and propagation loss to ensure a desired receiving power difference, allowing for efficient interference suppression and cancellation, thereby optimizing signal reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminals transmit signals using non-orthogonal multiple access with varying code word lengths, then communication capacity and spectral efficiency are improved, but delay control and interference management become more difficult
Solution Approach 1:
The base station dynamically adjusts transmission parameters including code word length, transmission power, and repetition count for each terminal based on channel conditions and QoS requirements. This allows flexible adaptation to different service types while maintaining delay control through optimized parameter selection for each terminal's specific needs
Solution Approach 2:
The system employs dynamic resource allocation where transmission parameters are not fixed but adapt in real-time based on channel state information, buffer status, and QoS requirements. This dynamic adjustment enables the system to maintain high communication capacity while controlling delays by optimizing parameters for each transmission instance
2Productivity
If multiple terminals transmit simultaneously using non-orthogonal multiple access, then spectral efficiency is improved, but interference between signals increases
Solution Approach 1:
The system applies different transmission parameters including power levels, code word lengths, and repetition counts to different terminals based on their specific channel conditions and QoS requirements. This localized parameter optimization allows simultaneous transmissions while managing interference through tailored parameter selection for each terminal
Solution Approach 2:
The base station performs preliminary resource allocation and parameter configuration before transmissions occur, assigning optimal code word lengths, power levels, and repetition counts to each terminal based on predicted channel conditions and QoS requirements. This preliminary optimization reduces interference by pre-configuring parameters that minimize conflict between simultaneous transmissions
3Reliability
If transmission power is increased to improve signal reception quality, then receiving power is improved, but interference to other terminals and power consumption increase
Solution Approach 1:
The system optimizes transmission power as a dynamic parameter based on channel conditions, QoS requirements, and interference levels. Instead of using fixed high power, the base station adjusts power levels adaptively for each terminal and transmission instance, achieving reliable reception while minimizing interference to other terminals through optimized power allocation
Solution Approach 2:
Transmission power is not fixed but dynamically adjusted based on real-time channel state information, buffer status, and QoS requirements. This dynamic power control allows the system to achieve reliable reception when needed while reducing power and interference during favorable conditions, optimizing the trade-off between reliability and interference
Data Source
AI summary
Provided is a transmission control method for a plurality of transmitting stations which are connected to a wireless communication partner receiving station by non-orthogonal multiple access, and each of which is capable of transmitting a same signal to the receiving station by repetition for a predetermined number of times at a predetermined cycle, wherein an information processing apparatus executes: acquiring information indicating a code word length for each of the plurality of transmitting stations to use for the repetition; and assigning, to each of the plurality of transmitting stations, transmitting power for ensuring a power difference which is required between transmitting stations, so that the shorter the code word length the higher the receiving power at the receiving station.