Shared-Channel MCS Grouping for Multi-QoS Data Transmission
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Solution Overview
Problem
Conventional multi-TTI scheduling in LTE-eLAA and NR-U reduces uplink data transmission rates due to all PDSCHs or PUSCHs being transmitted with the same modulation and coding scheme, despite varying required transmission qualities of data streams.
Innovation Solution
Divide logical channels into two groups based on QoS characteristics and apply different MCS indexes to each group, minimizing DCI bit size by signaling a combination of MCS indexes through one DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-TTI scheduling is used to schedule multiple PUSCHs through one DCI, then scheduling efficiency is improved, but transmission quality cannot be differentiated across different data streams
Solution Approach 1:
The patent segments the single MCS field in DCI into multiple MCS fields (first MCS field and second MCS field), where each field corresponds to different data streams or service types. This allows different modulation and coding schemes to be applied to different PUSCHs scheduled by the same DCI, enabling quality differentiation while maintaining scheduling efficiency.
Solution Approach 2:
The patent applies different MCS values to different data streams or service types within the same scheduling decision. Specifically, the first MCS field is applied to one data stream while the second MCS field is applied to another data stream, allowing each stream to have optimized transmission parameters suited to its specific QoS requirements.
2Adaptability or versatility
If different MCS indexes are applied to different data streams in multi-TTI scheduling, then transmission quality differentiation is improved, but DCI bit size increases
Solution Approach 1:
The patent changes the parameter representation by using differential encoding for the second MCS field. Instead of transmitting the full MCS value, only the difference from the first MCS value is transmitted. This reduces the number of bits required while still enabling differentiation of transmission quality across data streams.
Solution Approach 2:
The patent introduces a new dimension of information representation by using relative/differential values instead of absolute values. The second MCS field represents the difference from the first MCS field, effectively encoding two MCS parameters using fewer total bits than would be required for two independent full-range MCS fields.
3Reliability
If conventional single-TTI scheduling is used, then transmission quality can be maintained, but uplink data transmission rate is greatly reduced
Solution Approach 1:
The patent segments the scheduling control into multiple MCS fields within a single DCI, enabling multiple PUSCHs to be scheduled simultaneously with different transmission parameters. This multi-TTI scheduling approach increases the uplink data transmission rate while maintaining appropriate transmission quality for each data stream through dedicated MCS fields.
Data Source
AI summary
Provided are a method and an apparatus for transmitting data in a wireless communication system. Logical channels or data streams are divided into two groups according to QoS characteristics and sorted in ascending order of the target MCS. The logical channels or data streams arranged in ascending order of the target MCS are transmitted through a plurality of shared channels scheduled by one DCI. The MCSs of the two groups are one of a first type MCS index indicating both modulation order information and code rate information and a second type MCS index indicating modulation order information, and are limited to the same type of MCS indexes.