UE PTM Feedback Mechanism for Wireless Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE, face challenges in efficiently managing point-to-multipoint transmissions due to limitations in feedback mechanisms, leading to suboptimal data decoding and retransmission strategies, which affect the overall performance and reliability of data delivery to multiple users.
Innovation Solution
The implementation of a method where user equipment (UE) receives point-to-multipoint (PTM) data from a base station, attempts to decode it based on an identifier, and transmits feedback information, such as acknowledgments or negative acknowledgments, to adjust modulation coding schemes, transmission modes, or retransmission numbers, enabling the base station to retransmit data effectively without relying on hybrid automatic repeat request (HARQ) mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback mechanisms are implemented for PTM transmissions, then decoding success rate is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where UEs send ACK/NACK signals to the base station regarding PTM data reception status. The base station uses this feedback to determine whether retransmission is needed, creating a closed-loop system that improves decoding success rate while managing complexity through standardized feedback procedures
Solution Approach 2:
The system enables UEs to autonomously determine their decoding status and generate appropriate feedback signals without requiring complex centralized control. Each UE independently assesses its own reception status and contributes to the overall system optimization through self-generated feedback
2Reliability
If retransmission strategies are optimized based on feedback, then data delivery reliability is improved, but loss of time increases
Solution Approach 1:
The base station pre-configures retransmission parameters and strategies before actual data transmission occurs. By having retransmission mechanisms ready in advance based on anticipated feedback patterns, the system can quickly respond to NACK signals without extensive processing delays, reducing the time penalty of retransmissions
Solution Approach 2:
The retransmission strategy is dynamically adjusted based on real-time feedback from multiple UEs. The base station adapts its retransmission decisions, timing, and parameters according to the actual reception status reported by UEs, optimizing the balance between reliability improvement and time consumption
3Measurement precision
If feedback information is transmitted by all UEs, then measurement precision is improved, but use of energy increases
Solution Approach 1:
Instead of requiring all UEs to transmit feedback in all circumstances, the system implements selective feedback transmission. UEs transmit feedback information only when necessary (e.g., when decoding fails or under specific channel conditions), achieving sufficient measurement precision through partial participation while significantly reducing overall energy consumption compared to universal continuous feedback
Data Source
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AI summary
A method, an apparatus, and a computer-readable medium for wireless communication are provided. The apparatus receives point-to-multipoint (PTM) data from a base station, wherein the PTM data is transmitted to a group of UEs that includes the UE and that requested to receive a data service comprising the PTM data, attempts to decode the PTM data based on an identifier, and determines whether to transmit PTM feedback information for the PTM data to the base station based on the attempting to decode the PTM data, wherein the PTM feedback information for the PTM data is configured to be included along with unicast control information in a same uplink resource.