MCS Adaptation for Full-Duplex Interference Mitigation
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Solution Overview
Problem
In wireless communication systems, particularly in full-duplex mode, existing technologies face challenges in mitigating interference between downlink and uplink transmissions, leading to reduced system throughput, increased latency, and signal disruption due to self-interference.
Innovation Solution
The proposed solution involves adapting the modulation and coding scheme (MCS) of downlink transmissions to account for overlapping time with uplink transmissions by selecting an appropriate MCS for code block groups (CBGs), which can be time-interleaved over allocated symbols, allowing for improved interference management and granular control in wireless communication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex mode is used for simultaneous downlink and uplink transmissions, then communication efficiency is improved, but interference between transmissions increases
Solution Approach 1:
The transport block is divided into multiple code block groups (CBGs), allowing different MCS parameters to be applied to different CBGs based on their timing overlap with uplink transmissions. This segmentation enables granular interference management where only affected CBGs use reduced MCS while others maintain optimal MCS for high throughput.
Solution Approach 2:
Different MCS parameters are applied locally to different CBGs based on their specific interference conditions. CBGs that overlap with uplink transmissions use a first MCS parameter designed for interference resilience, while non-overlapping CBGs use a second MCS parameter optimized for throughput, achieving local optimization rather than uniform treatment.
2Reliability
If MCS is reduced to accommodate interference, then transmission reliability is improved, but system throughput decreases
Solution Approach 1:
By segmenting the transport block into CBGs, the system applies reduced MCS only to the subset of CBGs experiencing interference, while maintaining optimal MCS for non-interfered CBGs. This prevents the throughput penalty of applying reduced MCS to the entire transport block while still protecting reliability for affected segments.
Solution Approach 2:
The invention applies interference mitigation (reduced MCS) only partially to the extent necessary - specifically to CBGs that overlap with uplink transmissions. This partial action approach avoids the excessive throughput loss that would result from applying reduced MCS to all CBGs, while still providing sufficient protection for reliability where needed.
3Device complexity
If uniform MCS is used for entire transport block, then device complexity is reduced, but interference management precision decreases
Solution Approach 1:
The transport block is segmented into CBGs, each capable of having its own MCS parameter. This segmentation enables precise interference management by allowing different MCS values for different CBGs based on their timing characteristics, achieving granular control without requiring complex per-symbol MCS adjustment.
Solution Approach 2:
The MCS parameters become dynamic and adaptable to the specific interference conditions of each CBG. Rather than using a static uniform MCS, the system dynamically selects appropriate MCS parameters for each CBG based on whether it overlaps with uplink transmissions, achieving precision without excessive complexity.
4Reliability
If time-interleaving of CBGs is implemented, then interference mitigation is improved, but processing complexity increases
Solution Approach 1:
CBGs are segmented and time-interleaved across different time slots, distributing the impact of interference across multiple time instances. This segmentation approach provides interference mitigation through diversity while keeping the processing complexity manageable by working at the CBG level rather than individual symbol or bit level.
Data Source
AI summary
Aspects relate to adaptation of the modulation and coding scheme (MCS) of a downlink transmission to a scheduled entity that overlaps in time with an uplink transmission from the scheduled entity when the scheduled entity is operating in a full-duplex mode. A transport block corresponding to the downlink transmission may include a plurality of code block groups (CBGs). When at least a portion of the CBGs overlap in time with the uplink transmission, the MCS of the entire transport block or the MCS of the overlapping CBGs may be adjusted to accommodate and/or mitigate interference between downlink and uplink transmissions. The CBGs may further be time-interleaved over a plurality of symbols allocated for the downlink transmission to accommodate and/or mitigate interference between downlink and uplink transmissions. Other aspects, features, and embodiments are also claimed and described.