Dynamic Modulation Adjustment for LTE MAC PDU Padding Elimination
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Solution Overview
Problem
In LTE wireless networks, existing methods often require padding in MAC PDUs due to mismatched resource blocks, leading to inefficient data transmission and potential increased Bit Error Rates (BER) due to fixed modulation and coding schemes.
Innovation Solution
The system dynamically adjusts modulation and coding schemes based on Channel Quality Indicators (CQI) to eliminate padding by selecting slower schemes and rates, ensuring data fits within transmission time intervals without padding, thereby reducing BER.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed modulation and coding schemes are used as specified by CQI, then transmission reliability is maintained, but data transmission efficiency deteriorates due to required padding in MAC PDU
Solution Approach 1:
The patent applies dynamics by making the modulation and coding schemes adjustable rather than fixed. The eNB dynamically selects modulation and coding schemes from available options based on real-time conditions, allowing the system to adapt between reliability and efficiency requirements. This is implemented through the determination module that selects appropriate modulation and coding schemes for different MAC PDU segments.
Solution Approach 2:
The patent changes the parameters of modulation and coding schemes to optimize transmission. By varying modulation order and coding rates according to channel conditions and data size requirements, the system can eliminate padding while maintaining reliability. The eNB adjusts these parameters based on CQI feedback and actual data transmission needs.
2Productivity
If padding is added to MAC PDU to fit TTI, then transmission timing is maintained, but data transmission efficiency deteriorates due to wasted resources
Solution Approach 1:
The system dynamically adjusts modulation and coding schemes to match the actual data size, allowing the MAC PDU to fit exactly into the TTI without padding. This dynamic adaptation eliminates wasted resources while maintaining proper transmission timing through real-time parameter selection.
Solution Approach 2:
By changing modulation and coding parameters, the system can adjust the effective data rate to match the available TTI capacity exactly. This eliminates the need for padding bits while maintaining timing synchronization, as the parameters are selected to ensure the processed data fits the TTI duration.
3Productivity
If slower modulation schemes are selected to eliminate padding, then data transmission efficiency improves, but transmission speed decreases
Solution Approach 1:
The system dynamically selects modulation schemes based on the specific transmission requirements. Rather than always using slower schemes, the eNB chooses the appropriate modulation order and coding rate for each transmission opportunity, optimizing between speed and efficiency based on current channel conditions and data characteristics.
Solution Approach 2:
The patent changes modulation and coding parameters adaptively rather than fixedly. By adjusting these parameters based on CQI feedback and data size, the system achieves efficient transmission without unnecessarily reducing speed. The parameters are optimized for each specific transmission scenario.
Data Source
AI summary
A Long Term Evolution (LTE) protocol evolved Node-B (eNB) and method for dynamic modulation change while generating a Media Access Control (MAC) Protocol Data Unit (PDU) in a LTE wireless network are provided. The eNB in one example embodiment includes a transceiver system configured to receive a packet and a Channel Quality Indicator (CQI) from a User Equipment (UE) and a processing system coupled to the transceiver system and configured to determine whether padding is needed in the MAC PDU, if padding is needed, select a slower modulation scheme and coding rate than is specified by the CQI, wherein the selected slower modulation scheme and coding rate are selected so as to substantially eliminate padding in the MAC PDU, and transmit the MAC PDU using the selected slower modulation scheme and coding rate.