Multi-Carrier Resource Block MCS Assignment
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Solution Overview
Problem
Existing resource allocation methods in OFDM systems face inefficiencies when supporting high data rates, particularly when multiple resource blocks are allocated to a user, as they either lead to suboptimal modulation and coding schemes due to limited available schemes or result in lower data rates due to uniform MCS application across blocks.
Innovation Solution
A method and apparatus that rank resource blocks by quality and assign different modulation and coding schemes to each block, allowing for the use of higher-order modulations where channel quality is better, while ensuring sustainable data rates across multiple blocks, and reduce signaling overhead through efficient feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If independent MCS is chosen for each allocated resource block, then data rate can be maximized, but efficiency decreases when the set of available modulation coding schemes is limited because the quality of the best resource block may be much higher than is actually needed
Solution Approach 1:
The patent applies local quality by allowing different MCS indices to be assigned to different resource blocks based on their individual channel quality. Specifically, the base station receives CQI feedback for each resource block and selects an appropriate MCS index for each block, enabling high-quality blocks to use higher-order modulations while lower-quality blocks use more robust schemes, thus optimizing both data rate and efficiency.
Solution Approach 2:
The patent implements dynamics by making the MCS selection adaptive and flexible. The system dynamically adjusts the MCS index for each resource block based on real-time channel conditions reported through CQI feedback. This allows the modulation and coding scheme to change adaptively according to channel quality variations, maximizing throughput while maintaining reliability.
2Reliability
If a single MCS is used over all allocated resource blocks, then frequency diversity is provided, but data rate or throughput decreases
Solution Approach 1:
The patent resolves this contradiction by applying local quality - different resource blocks are assigned different MCS indices according to their specific channel quality conditions. High-quality blocks can support higher data rates with appropriate MCS, while still maintaining system reliability through the diversity of having multiple blocks with different characteristics. This eliminates the need to use a conservative single MCS across all blocks.
Solution Approach 2:
The patent applies segmentation by dividing the allocated resource blocks into separate groups, each with its own MCS index selection. Instead of treating all blocks uniformly with a single MCS, the system segments them and applies independent MCS optimization to each segment based on individual CQI measurements, thereby achieving both diversity and high data rate.
3Productivity
If multiple resource blocks are allocated to support high data rate, then throughput increases, but the complexity of treating multiple resource block allocation increases
Solution Approach 1:
The patent applies preliminary action by having the user equipment pre-calculate and report CQI values for each resource block before the actual data transmission. This preliminary feedback allows the base station to make informed MCS selection decisions for multiple resource blocks without having to perform complex real-time calculations during transmission, thereby managing complexity while supporting high throughput.
Solution Approach 2:
The patent implements feedback mechanisms where the user equipment measures channel quality for each resource block and sends CQI reports back to the base station. This feedback enables the base station to optimize MCS selection for multiple resource blocks based on actual channel conditions, achieving high throughput while keeping the allocation process manageable through information-driven decision making.
Data Source
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AI summary
A method and apparatus are provided for indicating to a communication unit a plurality of modulation and coding schemes (MCSs) to be utilized for communication. A first MCS is determined for first resource blocks to be sent to a first remote unit or base station, and a second MCS is determined for a second resource block to be sent to the remote unit or base station-. A message is transmitted indicating the first and the second MCS and also indicating the first resource blocks and the second resource block. Finally, a first PDU is transmitted to the remote unit or base station at a first time using the first MCS and the first resource blocks and a second PDU is transmitted to the remote unit or base station at the first time using the second MCS and the second resource block.