HARQ Process Configuration for Priority Data and Buffer Stalling
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Solution Overview
Problem
Current mobile communication systems face challenges in efficiently managing HARQ processes, leading to flushing of lower priority packets in the soft buffer due to higher priority data, resulting in inefficient use of radio resources and potential stalling issues during in-sequence delivery.
Innovation Solution
Configuring some HARQ processes as reserved or additional to prioritize high-priority data, allowing separate reordering queues and adjusting the number of HARQ processes based on round trip time to minimize buffer flushing and optimize data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ processes are dynamically allocated based on round trip time and UE capabilities, then data throughput and buffer utilization efficiency are improved, but system complexity and configuration overhead increase
Solution Approach 1:
The patent implements dynamic HARQ process configuration where the number of HARQ processes is adjusted based on round trip time (RTT) measurements and UE capabilities. The system transitions from static to dynamic allocation, allowing the network to optimize buffer utilization and data throughput by adapting the number of concurrent HARQ processes to current channel conditions and UE performance characteristics.
Solution Approach 2:
The patent changes the parameter of HARQ process count from a fixed value to a dynamically adjustable parameter. By modifying this parameter based on RTT and UE capability feedback, the system achieves improved throughput while managing complexity through standardized measurement and reporting mechanisms.
2Loss of time
If reserved HARQ processes are configured for high priority data, then latency for high priority data is reduced, but available resources for normal data transmission decrease
Solution Approach 1:
The patent segments HARQ processes into different priority levels, with reserved processes dedicated to high priority data and dynamic processes available for normal data transmission. This segmentation allows the system to guarantee low latency for high priority traffic while maintaining resource efficiency by dynamically allocating remaining processes to normal data based on current buffer conditions.
Solution Approach 2:
The patent applies partial reservation of HARQ processes rather than reserving all processes for high priority data. By reserving only a portion of processes (excessive action relative to minimum needs), the system ensures low latency for high priority traffic while leaving sufficient resources for normal data transmission, achieving a balance between priority handling and overall resource utilization.
3Productivity
If the number of HARQ processes is increased to reduce stalling, then reordering buffer efficiency is improved, but soft buffer memory requirements increase
Solution Approach 1:
The patent dynamically adjusts the number of HARQ processes based on measured stalling events and buffer utilization patterns. Rather than statically increasing the number of processes, the system monitors reordering buffer efficiency and adjusts process count accordingly, improving throughput while preventing excessive soft buffer memory consumption through adaptive control.
Data Source
AI summary
A method of HARQ process configuration in a mobile communication system, wherein a plurality of HARQ processes are transmitted from a transmitter to a receiver including the step of configuring a plurality of HARQ processes of unrestricted use for data flows having different priorities and the step of pre-configuring at least one reserved HARQ process for specific data flows of high priority. According to another embodiment, instead of a reserved HARQ process, an additional HARQ process is pre-configured.