Wireless Scheduler Buffering for RF Power Reduction
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Solution Overview
Problem
Traditional schedulers in wireless communication systems consume excessive RF energy due to continuous data transmission, as they prioritize minimizing latency over energy efficiency by using more robust modulation schemes and transmitting data as soon as possible, leading to increased power consumption.
Innovation Solution
A scheduler that buffers data packets based on priority levels and buffer thresholds, allowing for micro-sleep transmission modes and the use of higher-order modulation schemes when possible, ensuring higher priority data is transmitted promptly without delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted as soon as possible using robust modulation schemes, then latency is minimized and transmission reliability is improved, but RF power consumption increases
Solution Approach 1:
The patent applies preliminary action by buffering data packets before transmission and performing channel quality assessment in advance. The scheduler evaluates channel conditions and selects optimal modulation and coding schemes before actual transmission, allowing the system to prepare transmission parameters ahead of time rather than reacting to immediate transmission needs. This advance preparation enables more efficient resource utilization and reduces the need for overly robust modulation schemes.
Solution Approach 2:
The patent implements dynamics by making the modulation and coding scheme selection adaptive to current channel conditions. Instead of using fixed robust modulation schemes, the system dynamically adjusts transmission parameters based on real-time channel quality indicators. This allows the system to use higher-order, more spectrally efficient modulation when channel conditions permit, thereby reducing RF power consumption while maintaining reliability.
2Productivity
If more Physical Resource Blocks are allocated for data transmission, then data transmission capacity increases, but the number of subcarriers increases leading to higher energy consumption
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the modulation order and coding rate based on channel quality feedback. When channel conditions are good, the system increases modulation order (e.g., from QPSK to 16QAM or 64QAM) and adjusts coding rate to transmit more bits per subcarrier. This allows the system to achieve higher data transmission capacity without proportionally increasing the number of subcarriers or Physical Resource Blocks, thereby reducing energy consumption per bit transmitted.
3Reliability
If robust Modulation and Coding Scheme is used, then transmission reliability is improved, but spectral efficiency decreases requiring more subcarriers
Solution Approach 1:
The patent implements dynamics by making MCS selection adaptive to channel conditions. The scheduler continuously monitors channel quality indicators and dynamically selects the appropriate modulation order and coding rate. This allows the system to achieve high spectral efficiency when channel conditions are favorable while maintaining transmission reliability through appropriate use of robust modulation schemes when conditions deteriorate, thus resolving the trade-off between reliability and spectral efficiency.
Data Source
AI summary
A scheduler and method for scheduling data transmission in a wireless communication system are disclosed. The scheduler buffers data packets in a buffer and monitors status of the buffer. The buffered data packets will remain in the buffer, until the buffer contains a data packet which is associated with a priority level higher than a priority level of a predefined priority threshold. Then, the scheduler selects a modulation and coding scheme for the buffered data packets and sends the buffered data packets to a radio unit for transmission.