MCS Update in Group Control Channel for Retransmission
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Solution Overview
Problem
In wireless communication systems, especially in dense environments like factory automation, group resource allocation for retransmissions can be inefficient due to varying channel conditions among user equipment (UEs), leading to differing modulation and coding scheme (MCS) requirements, which existing methods struggle to address effectively.
Innovation Solution
The implementation of MCS updates within group control messages allows base stations to dynamically adjust resource allocations based on channel state information, ensuring each UE receives optimal retransmission resources tailored to its specific conditions, thereby improving operational efficiency and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If group resource allocation is used for retransmissions, then overhead is reduced and resource efficiency is improved, but reliability deteriorates due to varying channel conditions among UEs
Solution Approach 1:
The patent applies local quality by allowing different MCS values to be assigned to different UEs within the same group. Instead of using a uniform MCS for all UEs receiving group common PDCCH, the base station can provide UE-specific MCS indications, enabling each UE to use an MCS appropriate for its channel conditions while still benefiting from group-based resource allocation overhead reduction.
2Reliability
If UE-specific resource allocation is used for retransmissions, then reliability is improved by accommodating diverse channel conditions, but overhead increases and resource efficiency decreases
Solution Approach 1:
The patent merges the advantages of both group-based and UE-specific approaches by combining group common PDCCH for resource allocation with UE-specific MCS indications. This hybrid approach allows the system to maintain the overhead efficiency of group allocation while incorporating the reliability benefits of UE-specific parameter adaptation.
3Ease of operation
If uniform MCS is used for all UEs in group allocation, then device complexity is reduced and ease of operation is improved, but adaptability deteriorates due to varying channel conditions
Solution Approach 1:
The patent introduces dynamics by allowing the MCS parameter to be adaptively adjusted on a per-UE basis within the group allocation framework. The base station can dynamically determine and signal appropriate MCS values for each UE based on current channel conditions, transforming the static uniform MCS approach into a dynamic adaptive system.
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AI summary
Methods, systems, and devices for wireless communication are described. A wireless device may receive an indicator of retransmission scheduling for a plurality of UEs, determine, based on a modulation and coding scheme (MCS) update in the indicator, resources for receiving a retransmission, and receive the retransmission on the determined resources. A base station may receive a negative acknowledgement report from at least one UE of a plurality of UEs, determine a modulation and coding scheme (MCS) update for the at least one UE, generate an indicator of retransmission scheduling for the plurality of UEs, the indicator including the MCS update for the at least one UE, and transmit the indicator.