Downlink Packet Scheduling with Adaptive Modulation Coding
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Solution Overview
Problem
Conventional downlink packet scheduling methods in wireless communication systems fail to evenly satisfy Quality of Service (QoS) levels for each user traffic flow while maximizing total data throughput, particularly due to limitations in handling real-time and non-real-time traffic with limited physical resource blocks (PRBs) and transmission power.
Innovation Solution
An adaptive modulation and coding (AMC) scheme is employed to select a combination of PRBs with the smallest transmission power per bit for real-time traffic, with remaining PRBs allocated to non-real-time traffic using excess transmission power, optimizing scheduling based on excess channel gain and reception power required per bit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional downlink packet scheduling methods are used, then total data throughput can be maximized, but Quality of Service (QoS) levels for each user traffic flow cannot be evenly satisfied
Solution Approach 1:
The patent segments traffic flows into real-time traffic flows and non-real-time traffic flows, applying different scheduling metrics to each segment. Real-time traffic uses a metric that prioritizes QoS requirements, while non-real-time traffic uses a metric that maximizes throughput, thereby resolving the contradiction between overall throughput and individual QoS satisfaction
Solution Approach 2:
The patent applies different scheduling metrics (local quality) to different traffic flows based on their specific requirements. The scheduling metric is adapted locally for each traffic flow type, allowing real-time traffic to receive priority treatment while non-real-time traffic contributes to overall throughput, thus satisfying both QoS requirements and maximizing total throughput
2Reliability
If physical resource blocks (PRBs) are allocated to real-time traffic, then QoS for real-time traffic is improved, but available resources for non-real-time traffic are reduced
Solution Approach 1:
The patent allocates PRBs to real-time traffic flows using a scheduling metric that ensures sufficient resources for QoS requirements, while allocating remaining PRBs to non-real-time traffic flows. This partial allocation approach ensures real-time traffic receives necessary resources without completely depriving non-real-time traffic of available resources, thus balancing QoS satisfaction with overall throughput
Data Source
AI summary
The present invention relates to a method and apparatus for scheduling a downlink packet in a wireless communication system, which preferentially appoints a combination of a traffic flow and a physical resource block (PRB) having a low per-bit transmission power requirement during real-time traffic scheduling, and allocates the remaining PRBs to non-real-time traffic using spare transmission power. For this purpose, the downlink packet scheduling method of the present invention comprises: an operation of performing real-time traffic scheduling, which involves carrying out the process of preferentially appointing a combination of traffic flow and a PRB having the lowest per-bit transmission power requirement; a step of performing non-real-time traffic scheduling, which involves allocating remaining PRBs, which remain after the allocation to the real-time traffic, to non-real-time traffic using spare transmission power.