Base Station Link Adaptation for Consecutive Packet Loss
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Solution Overview
Problem
Current wireless communication systems, particularly in industrial applications, face challenges in managing consecutive packet loss for delay-critical traffic, as existing link adaptation mechanisms do not consider aggregated reliability across multiple transmissions, leading to potential system unavailability and emergency shutdowns.
Innovation Solution
The proposed solution involves a method where a base station determines a reliability requirement for packet transmission based on consecutive packet loss, adjusting parameters such as Modulation Coding Scheme and transmit power to ensure successful delivery within a specified time frame, thereby reducing the likelihood of consecutive packet loss and enhancing system robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing link adaptation mechanisms are used for packet transmission, then transmission speed and system capacity are maintained, but consecutive packet loss occurs leading to system unavailability
Solution Approach 1:
The patent implements dynamic link adaptation by continuously monitoring consecutive packet loss events and adjusting the Modulation Coding Scheme (MCS) index in real-time. When packet loss is detected, the system dynamically transitions to a more robust MCS with lower order modulation and stronger error correction, thereby adapting transmission parameters to current channel conditions to prevent consecutive packet loss while maintaining optimal system capacity.
Solution Approach 2:
The system employs feedback mechanisms where the base station monitors acknowledgment (ACK)/negative acknowledgment (NACK) signals from wireless devices regarding packet reception status. This feedback information about consecutive packet loss is fed back to the scheduler, which then adjusts subsequent transmission parameters including MCS selection and transmit power levels, creating a closed-loop control system that improves reliability without permanently sacrificing system capacity.
2Reliability
If transmission robustness is increased to prevent packet loss, then reliability improves, but system capacity and throughput decrease
Solution Approach 1:
The patent changes transmission parameters dynamically based on observed packet loss patterns. Specifically, it adjusts the MCS index which controls both modulation order (affecting throughput) and coding rate (affecting reliability). By changing these parameters adaptively rather than using fixed robust settings, the system achieves improved packet delivery reliability only when necessary, thereby minimizing the impact on overall data throughput and maintaining higher system capacity during good channel conditions.
3Reliability
If conventional scheduling is used, then resource allocation efficiency is maintained, but delay critical traffic experiences consecutive packet loss
Solution Approach 1:
The patent implements preliminary action by proactively adjusting transmission parameters before consecutive packet loss can occur. The scheduler monitors the consecutive packet loss counter and preemptively switches to a more robust MCS when the counter indicates approaching failure thresholds. This preliminary adjustment prevents the actual packet loss events that would otherwise occur, thereby improving consecutive packet delivery without requiring complex real-time intervention mechanisms.
Data Source
AI summary
A method performed by a base station includes determining a reliability requirement for a packet to be transmitted to a wireless device. The reliability requirement is determined based at least in part on a consecutive packet loss associated with at least one previously transmitted packet. Based on the reliability requirement, the packet is transmitted to the wireless device.