Flexible Implicit Modulation Coding Scheme Indication
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Solution Overview
Problem
Current wireless communication systems face limitations in efficiently indicating modulation and coding schemes due to the limited number of explicit modulation and coding scheme entries in modulation and coding scheme tables, which restricts the number of modulation and coding scheme allocation combinations for achieving target transport block sizes, especially with the increasing use of higher modulation orders.
Innovation Solution
The implementation of flexible implicit modulation and coding scheme indications, where a modulation and coding scheme index associated with multiple modulation orders is used, allowing the selection of modulation orders based on prior transmission orders and thresholds, enabling dynamic determination of modulation orders for encoding or decoding transport blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If explicit modulation and coding scheme entries are used in modulation and coding scheme tables, then the system can directly indicate modulation and coding schemes, but the limited number of entries restricts the number of modulation and coding scheme allocation combinations
Solution Approach 1:
The patent applies dynamics by transitioning from static explicit entries to dynamic implicit indication. The modulation and coding scheme is no longer fixed in the table but is dynamically determined through a combination of table lookup and bit manipulation operations, allowing flexible adaptation to different channel conditions without requiring additional table entries
Solution Approach 2:
The patent changes the parameter representation from direct explicit values to implicit derived values. Instead of storing complete modulation and coding scheme combinations as fixed entries, the system uses a index value that combines with channel quality information to dynamically calculate the actual modulation and coding scheme parameters
2Productivity
If more modulation orders are supported to increase data rate, then network efficiency improves, but the limited table entries restrict the ability to accommodate higher modulation orders
Solution Approach 1:
The system dynamically determines the modulation order based on the indicated index and channel quality information rather than relying on pre-defined table entries. This dynamic approach allows the system to accommodate higher modulation orders (beyond what traditional tables support) by calculating the appropriate order from the index and quality metrics
Solution Approach 2:
The patent adds an additional dimension of flexibility by introducing channel quality information as a second factor that interacts with the table index. This dimensional expansion allows the system to derive multiple possible modulation and coding scheme combinations from a single table entry, effectively increasing the accommodable modulation orders without adding table entries
3Loss of energy
If implicit modulation and coding scheme indication is used, then signaling overhead is reduced, but the complexity of determining the correct modulation order increases
Solution Approach 1:
The patent extracts the essential information needed for modulation and coding scheme determination from the full table lookup process. By using only the index value and channel quality information, the system extracts the necessary parameters to calculate the modulation order without needing to process complete table entries, reducing complexity while maintaining flexibility
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for a base station transmitting a modulation and coding scheme index corresponding to a modulation and coding scheme table to a user equipment (UE). The modulation and coding scheme index may be applied to encoding or decoding a transport block. The modulation and coding scheme may be associated with at least two modulation orders or a differential indication according to a modulation and coding scheme table. To determine which of the modulation orders for processing the transport block, the UE and the base station may use a prior modulation order associated with a prior transmission of the transport block. The UE may process the transport block by encoding or decoding the transport block based at least in part on the determined modulation order.