SDMA Radio Resource Allocation via Surplus Power Redistribution
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Solution Overview
Problem
In SDMA systems, existing methods for allocating radio frequency bands inefficiently distribute transmission power, leading to wasted resources due to varying channel qualities among different bands, resulting in suboptimal Carrier to Interference and Noise Ratio (CINR) and Modulation order Product code Rate (MPR) across channels.
Innovation Solution
A method and apparatus that include a scheduler, power controller, and multiplier to measure and redistribute transmission power by allocating data bursts across multiple channel bands, extracting surplus power, and redistributing it to achieve balanced MPR levels, utilizing a weight-based multiplication of frequency domain signals to optimize transmission power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If transmission power is fixedly distributed by 0.5 on a per-resource basis, then the allocation process is simple, but the transmission power is wasted due to varying channel qualities across different bands
Solution Approach 1:
The patent applies local quality by redistributing transmission power according to the specific channel quality of each band. Instead of uniform power distribution, the system allocates power dynamically based on measured CINR values for each band, ensuring that bands with poorer channel conditions receive more power while bands with better conditions receive less, thereby optimizing overall power utilization efficiency
Solution Approach 2:
The patent implements dynamics by making the transmission power distribution adaptive rather than static. The power allocation changes based on real-time channel conditions, with the base station measuring CINR for each band and adjusting power distribution accordingly. This dynamic approach allows the system to respond to varying channel qualities and maximize power efficiency under different propagation conditions
2Device complexity
If several bands are merged into one data burst, then the radio resource allocation is simplified, but the overall MPR is reduced due to the lowest MPR band limiting the aggregate
Solution Approach 1:
The patent applies parameter changes by adjusting the transmission power parameter for each band based on its CINR characteristics. By changing the power parameter dynamically, the system can compensate for bands with lower MPR, thereby improving the overall MPR of the merged data burst without increasing the complexity of the allocation process
Solution Approach 2:
The patent implements skipping by allowing the system to bypass the limitation of the lowest MPR band through power redistribution. Instead of being constrained by the weakest band's MPR, the system rushes through the bottleneck by allocating additional power to that band, thereby achieving a higher overall MPR for the aggregated data burst
Data Source
AI summary
Provided is an apparatus and method for allocating a radio frequency band resource in a Space Division Multiple Access (SDMA) system. The scheduler allocates a data burst, extracts a surplus power resource from each channel band, redistributes the extracted surplus power resource to the data burst, outputs redistributed transmission power information to a power controller, and outputs allocated burst information and the data burst to a modulation block. The power controller receives the transmission power information from the scheduler, and outputs a weight associated with a transmission power. The multiplier receives a frequency domain signal, multiplies the received frequency domain signal by the weight, and outputs the multiplied result to an IFFT operator.