Base Station Data Scheduling for ARQ Reliability and Delay
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Solution Overview
Problem
In wireless data communication, existing ARQ methods face challenges in efficiently managing transmission priority and retransmissions, leading to potential service delays and packet discards due to conflicting priorities and overhead in error correction processes.
Innovation Solution
A scheduling apparatus that receives mobile station status information to determine and manage transmission priority of data units, incorporating a transmitter to retransmit data based on ACK/NACK messages and update transmission parameters, ensuring timely retransmissions and optimal priority scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission packets are prioritized to be sent first among packets having the same priority, then transmission reliability is improved, but service delay increases for initial transmissions
Solution Approach 1:
The patent implements dynamic priority adjustment where retransmission packets can be promoted to higher priority levels based on their retransmission status and timeout risk, rather than maintaining fixed priority levels. This allows the system to adaptively balance reliability and delay by dynamically reordering packet transmission queues.
Solution Approach 2:
The patent applies preliminary actions by proactively identifying packets that are at risk of timeout and prioritizing their retransmission before actual timeouts occur. The base station monitors packet transmission status and preemptively schedules retransmissions to prevent service cut-offs.
2Loss of time
If high-priority initial transmissions are scheduled first, then service delay is reduced, but transmission reliability deteriorates due to potential retransmission timeouts
Solution Approach 1:
The system dynamically adjusts packet priorities based on real-time transmission status, allowing initial transmissions to maintain high priority while retransmission packets are selectively promoted when timeout risks are detected, rather than using static priority assignment.
Solution Approach 2:
The base station implements feedback mechanisms to monitor packet acknowledgment status and transmission timing, using this information to dynamically adjust scheduling decisions. When feedback indicates potential retransmission timeouts, the system responds by prioritizing those packets in subsequent scheduling cycles.
3Ease of operation
If scheduling is performed according to service priority, then service quality is improved, but retransmission reliability deteriorates when low-priority packets need continuous retransmission
Solution Approach 1:
The patent implements dynamic priority adjustment where retransmission packets can be promoted to higher priority levels based on their retransmission status and timeout risk, rather than maintaining fixed priority levels. This allows the system to adaptively balance reliability and delay by dynamically reordering packet transmission queues.
Solution Approach 2:
The patent applies preliminary actions by proactively identifying packets that are at risk of timeout and prioritizing their retransmission before actual timeouts occur. The base station monitors packet transmission status and preemptively schedules retransmissions to prevent service cut-offs.
Data Source
AI summary
The present invention relates to a scheduling apparatus of a base station supporting Automatic Repeat reQuest (ARQ) method. In particular, the present invention discloses scheduling a data unit transmitted to a mobile station from a base station providing ARQ method for correcting an error in wireless data communication and generating a high rate frame.According to the present invention, there is provided a transmission controlling apparatus comprising a receiver to receive mobile station status information from a mobile station connected with a base station, a schedule managing unit to determine transmission priority of a plurality of data units to be transmitted to the mobile station based on the received mobile station status information, and a transmitter to transmit the data units to the mobile station based on the determined transmission priority.