5G MIMO Layer Scheduling via Multiple Downlink Control Channels
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Solution Overview
Problem
Current 5G NR MIMO systems face performance limitations due to the use of a single codeword for reported ranks less than or equal to 4, which leads to inefficient modulation and coding scheme assignment based on average or minimum SINR across layers, failing to utilize layers with higher SINR for additional bandwidth.
Innovation Solution
Implementing multiple downlink control channels to indicate the number of layers and DMRS ports for each data channel, allowing for separate modulation and coding schemes based on channel quality indicators, and scheduling a second data channel on layers with the highest SINR to maximize bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single codeword is used for reported ranks less than or equal to 4, then the system structure is simple, but the modulation and coding scheme assignment becomes inefficient and fails to utilize layers with higher SINR
Solution Approach 1:
The patent segments the single codeword approach into multiple codewords, where each codeword can be independently mapped to different layers. This allows separate modulation and coding schemes to be assigned based on individual layer SINR values, enabling efficient resource utilization while maintaining manageable system complexity through structured segmentation of the coding process
Solution Approach 2:
The patent applies local quality by assigning different modulation and coding schemes to different layers based on their individual SINR values. Instead of using a uniform scheme across all layers, each layer receives optimized parameters tailored to its specific channel quality, maximizing the data transfer rate for each layer while improving overall system productivity
2Productivity
If modulation and coding scheme is assigned based on average or minimum SINR across layers, then the system is simple to implement, but layers with higher SINR cannot be utilized for additional bandwidth
Solution Approach 1:
The patent implements local quality by evaluating and assigning modulation and coding schemes individually for each layer based on its specific SINR value. This allows the system to identify and utilize layers with higher SINR for additional bandwidth, optimizing bandwidth utilization while the structured control mechanism keeps the added complexity manageable
Solution Approach 2:
The patent introduces dynamic adaptation by allowing the modulation and coding scheme to be adjusted based on the actual SINR measurements of each layer. The system dynamically selects the appropriate scheme for each layer rather than using a static average or minimum-based approach, enabling flexible optimization of bandwidth utilization across varying channel conditions
Data Source
AI summary
A base station device can transmit data via multiple data channels to a single user equipment device. Each of the multiple data channels can be configured and scheduled via respective downlink control channels to the user equipment device. In an embodiment, the first data channel can be mapped to multiple layers, with a modulation and coding scheme (MCS) assigned based on the average channel quality indicator (CQI) of the layers. One or more of the layers can have a higher CQI however, capable of supporting an additional transmission. The base station device can then facilitate establishing a second data channel to the layer with the higher CQI. The MCS assigned to the second data traffic channel can be based on the CQI of the layer, or based on a difference between the average CQI of the layers and the CQI of the layer.