Modulation Order Cap for UCI Transmission on PUSCH
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting uplink control information due to interference and congestion, particularly when multiplexing with payload data on the physical uplink shared channel (PUSCH), where using the same modulation and coding scheme for both can lead to suboptimal performance and resource mismatch.
Innovation Solution
A method where a user equipment (UE) determines a different modulation and coding scheme for uplink control information compared to payload data, based on indications from a base station, such as through radio resource control (RRC) configurations or downlink control information messages, and applies a modulation order cap if necessary, to optimize the transmission on the PUSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same modulation and coding scheme is used for both uplink control information and payload data on PUSCH, then device complexity is reduced, but transmission reliability and efficiency deteriorate due to resource mismatch and interference
Solution Approach 1:
The patent segments the PUSCH transmission into two distinct parts: uplink control information (UCI) and payload data. Each segment is assigned a separate modulation and coding scheme (MCS), allowing optimized transmission parameters for each type of information. The UCI uses one MCS while the payload data uses another, resolving the contradiction by enabling differentiated treatment rather than a unified approach.
Solution Approach 2:
The patent applies local quality by assigning different transmission characteristics to different parts of the PUSCH. Specifically, the UCI portion receives a tailored MCS configuration that may differ from the payload data's MCS. This allows each local region (UCI vs. data) to have optimal quality parameters suited to its specific requirements, improving overall reliability without requiring uniform complexity reduction.
2Productivity
If different modulation and coding schemes are applied to uplink control information and payload data, then transmission efficiency and reliability are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent introduces dynamic MCS selection where the modulation and coding schemes for UCI and payload data can be independently adjusted based on channel conditions, traffic type, and priority levels. The base station dynamically configures different MCS parameters for each part, allowing the system to adapt to varying transmission requirements without fixed constraints, thereby improving efficiency while managing complexity through flexible control.
Solution Approach 2:
The patent changes multiple transmission parameters simultaneously, including modulation order, coding rate, and resource allocation, to optimize UCI and payload data transmission. By adjusting these parameters independently for each data type, the system achieves improved transmission efficiency and reliability while the base station manages the complexity through centralized parameter control and configuration.
3Productivity
If modulation order cap is applied to UCI transmission, then resource allocation efficiency is improved, but transmission flexibility is reduced
Solution Approach 1:
The patent applies preliminary action by pre-establishing modulation order caps for UCI transmission before actual data transmission occurs. The base station configures maximum modulation order limits in advance, allowing the system to prepare resource allocation plans with known constraints. This pre-planning improves resource allocation efficiency by preventing excessive modulation order usage while maintaining flexibility within the predetermined bounds through other adjustable parameters like coding rate and resource blocks.
Data Source
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AI summary
Techniques for signaling varied modulation and coding schemes for wireless communication are discussed. A method of wireless communication may comprise receiving, by a user equipment (UE), an indication to apply a modulation order cap to determine a first modulation and coding scheme for transmission of uplink control information different from a second modulation and coding scheme for transmission of data. The method may further comprise transmitting the uplink control information using the first modulation and coding scheme, wherein the first modulation and coding scheme is determined based, at least in part, on the received indication to apply the modulation order cap.