Uplink MCS Offsets for Logical Channel Reliability
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Solution Overview
Problem
Wireless communication systems face challenges in maintaining reliable data transmission due to signal quality variations, leading to high block error rates (BLER) and increased retransmissions, which waste network resources and fail to meet quality of service (QoS) requirements.
Innovation Solution
Implementing a conservative modulation and coding scheme (MCS) estimate with MCS offsets for logical channels (LCs) to adjust transmission parameters based on remaining packet delay budgets (PDB) and reliability requirements, allowing user equipment (UE) to adjust MCS for each LC to meet target BLER and PDB, reducing the need for retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single MCS is used for all logical channels, then device complexity is reduced, but transmission reliability deteriorates due to high BLER and retransmissions
Solution Approach 1:
The patent segments the single MCS parameter into multiple LC-specific MCS parameters. Each logical channel is assigned its own MCS value, allowing differentiated transmission parameters for different traffic types. This segmentation enables the system to optimize reliability for each LC individually while maintaining manageable complexity through structured configuration mechanisms.
Solution Approach 2:
The patent applies local quality by allowing different MCS values for different logical channels based on their specific QoS requirements. Each LC can have customized MCS parameters tailored to its packet delay budget and reliability needs, rather than using a uniform MCS for all channels. This localized optimization improves overall transmission reliability.
2Reliability
If conservative MCS estimates are used with MCS offsets, then transmission reliability improves, but use of energy increases due to adjusted transmission parameters
Solution Approach 1:
The patent introduces dynamic MCS adjustment through MCS offsets that can be modified based on remaining packet delay budgets and channel conditions. The MCS parameters are not static but adapt dynamically to current transmission needs, allowing the system to balance reliability requirements with energy efficiency by adjusting parameters in real-time rather than using consistently conservative estimates.
Solution Approach 2:
The patent changes the MCS parameters by applying offsets to base MCS values. These parameter adjustments allow the system to fine-tune transmission reliability for each logical channel without always defaulting to conservative estimates. The MCS offset mechanism enables precise control over transmission parameters, optimizing the balance between reliability and energy consumption.
3Measurement precision
If LC-specific MCS parameters are implemented, then transmission precision improves, but device complexity increases due to multiple MCS configurations
Solution Approach 1:
The patent applies preliminary action by pre-configuring MCS parameters and offsets for different logical channels before actual data transmission. The network entity establishes LC-specific MCS configurations in advance based on QoS requirements, so that when transmission occurs, the appropriate parameters are already in place. This preliminary configuration reduces the complexity of real-time decision-making while maintaining high precision.
Solution Approach 2:
The patent implements feedback mechanisms where the network entity monitors transmission performance and adjusts MCS offsets based on observed BLER and packet delay budget consumption. This feedback loop allows the system to learn from actual transmission outcomes and refine MCS parameters, improving selection precision while managing complexity through data-driven optimization rather than exhaustive configuration.
4Reliability
If retransmissions are increased to meet QoS requirements, then reliability improves, but loss of time increases due to redundant transmissions
Solution Approach 1:
The patent applies preliminary action by pre-calculating and configuring appropriate MCS parameters for each logical channel based on their QoS requirements, including packet delay budgets. By selecting the correct MCS upfront rather than relying on retransmissions, the system meets reliability targets within the allotted time. The preliminary MCS configuration prevents time-lossy retransmission cycles by getting the transmission parameters right the first time.
Solution Approach 2:
The patent substitutes the mechanical retransmission approach with a more efficient MCS selection mechanism. Instead of relying on repeated transmissions to achieve reliability, the system uses precisely tuned MCS parameters to ensure successful first-attempt delivery. This substitution replaces the brute-force retransmission method with a smarter parameter-based approach that conserves time while meeting QoS targets.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques wireless communication by a user equipment (UE), comprising receiving an uplink (UL) grant from a network entity, wherein the UL grant schedules the UE to transmit an UL channel transmission associated with a plurality of logical channels (LCs), and the UL grant indicates a modulation and coding scheme (MCS) for transmitting the UL channel transmission associated with the plurality of LCs, receiving a plurality of MCS offsets, and transmitting the UL channel transmission associated with one or more LCs of the plurality of LCs based on the MCS indicated in the UL grant and the plurality of MCS offsets.