Radio Base Station Excess Power Allocation and CQI Adjustment
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Solution Overview
Problem
In wireless communications networks, especially in low load scenarios, available power is not efficiently utilized, leading to suboptimal Block Error Rate (BLER) and scheduling errors due to incorrect Channel Quality Indicator (CQI) adjustments.
Innovation Solution
A communications unit and method that allocates excess power to user terminals in a subframe, adjusting the power allocation based on experienced BLER and CQI, and includes a CQI adjustment unit to compensate for the altered BLER by weighting ACK/NACK signals from blocks with and without excess power, ensuring target BLER is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is allocated to achieve target BLER for all scheduled user terminals, then reliable transmission is ensured, but available power is not efficiently utilized in low load scenarios
Solution Approach 1:
The patent applies partial action by initially allocating power to achieve target BLER for scheduled user terminals, then identifying and utilizing excess power that remains unallocated. This allows the system to perform the minimum necessary power allocation while capturing opportunities for additional power utilization to improve throughput without compromising reliability.
2Measurement precision
If CQI adjustment is performed based on ACK/NACK ratio comparison to target BLER, then scheduling accuracy is improved, but errors occur when excess power is allocated altering the experienced BLER
Solution Approach 1:
The patent segments the BLER measurement into two distinct components: target BLER (based on ACK/NACK ratio comparison) and experienced BLER (actual transmission performance). By separating these measurements and comparing them, the system can identify when excess power allocation is occurring and adjust CQI accordingly, preventing scheduling errors while maintaining accuracy.
3Productivity
If excess power is allocated to user terminals, then peak data rates are improved, but experienced BLER deviates from target BLER causing CQI adjustment errors
Solution Approach 1:
The patent implements feedback by continuously monitoring the relationship between target BLER and experienced BLER. When excess power allocation causes experienced BLER to deviate from target BLER, the system uses this feedback to adjust CQI values, ensuring that scheduling decisions remain accurate even when operating in high-throughput modes with excess power available.
Data Source
AI summary
A radio base station (1) for use in a wireless communication system comprises—a scheduling unit (9) arranged to schedule at least one user terminal to which to transmit in each subframe and—a power allocation unit (11) arranged to allocate a first amount of power to be used for the at least one user terminal in each subframe, a transmitter (5) arranged to transmit a transport block in a subframe to a number of user terminals (3) in the wireless communication system in accordance with said scheduling and power allocation. The radio base station further comprises—a correction unit (5) arranged to determine, after scheduling has been performed for a chosen subframe, if there is excess power in the chosen subframe that has not been allocated to any user terminal and if so allocate at least a first part of the excess power to at least one user terminal scheduled in the subframe. The excess power is used when transmitting in the subframe.