UE Feedback Codebook for Dynamic MCS Adjustment
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Solution Overview
Problem
Wireless communication systems face inefficiencies due to incorrect scheduling of modulation and coding schemes (MCS) by base stations, leading to unnecessary reconfiguration signaling and resource misallocation.
Innovation Solution
User equipment (UE) provides feedback to base stations using a codebook with delta values to adjust the MCS for subsequent transmissions or retransmissions based on successful or unsuccessful decoding, allowing for dynamic adaptation of modulation and coding schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the base station uses fixed MCS scheduling, then the system complexity is reduced, but the communication efficiency deteriorates due to incorrect MCS selection and unnecessary reconfiguration signaling
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends ACK/NACK signals along with delta MCS values to the base station. The base station uses this feedback to dynamically adjust the MCS for subsequent transmissions, resolving the contradiction by enabling efficient adaptive scheduling without requiring complex centralized control algorithms.
Solution Approach 2:
The system enables self-service through autonomous MCS adjustment at the UE side. The UE independently determines decoding success/failure and generates appropriate delta MCS values, allowing the system to adapt to channel conditions without requiring complex base station processing or extensive reconfiguration signaling.
2Productivity
If the base station frequently reconfigures MCS, then the communication efficiency is improved, but the loss of time increases due to unnecessary reconfiguration signaling
Solution Approach 1:
The patent extracts the MCS adjustment information into a separate delta MCS field that is transmitted alongside ACK/NACK signals. This allows the MCS reconfiguration to occur as a byproduct of the existing feedback mechanism, eliminating the need for separate reconfiguration signaling and reducing time loss.
Solution Approach 2:
The patent merges the MCS adjustment function with the existing ACK/NACK feedback mechanism. By combining delta MCS indication with acknowledgment signals, the system achieves both error correction and adaptive scheduling in a single signaling event, thereby improving communication efficiency without increasing reconfiguration time.
3Measurement precision
If the feedback message includes detailed decoding information, then the measurement precision is improved, but the device complexity increases due to larger codebook sizes
Solution Approach 1:
The patent applies local quality by providing different levels of feedback precision for different scenarios. The delta MCS values provide precise adjustment information when needed, while the compact codebook structure maintains low complexity for basic ACK/NACK functionality. This resolves the contradiction by offering precision only where required rather than uniformly across all feedback scenarios.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may transmit a data message to a user equipment (UE) in a data block modulated according to a modulation and coding scheme (MCS). The UE may monitor for the data block and may attempt to decode the data block. If the UE successfully receives and decodes the data block, the UE may transmit an acknowledgment (ACK) in a feedback message. If the UE unsuccessfully receives or decodes the data block, the UE may transmit a negative acknowledgement (NACK). The UE may transmit the feedback message with the ACK or NACK and a value from a codebook indicating for the base station to increase or decrease the MCS by a delta value for a following transmission or a retransmission.