Uplink Power Control Offset for HARQ Traffic Differentiation
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Solution Overview
Problem
In IEEE 802.16e communication systems, uplink power control lacks differentiation between Hybrid Automatic Repeat Request (HARQ) and non-HARQ traffic, leading to a target-PER mismatch that compromises reliability and HARQ gain.
Innovation Solution
A method and system for uplink power control that determines a power control offset based on whether HARQ is applied, allowing separate power control for HARQ and non-HARQ traffic by adjusting transmission power levels through Uplink Channel Descriptor messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lower target PER is used for uplink power control, then wireless link reliability is improved, but the required uplink CINR value increases, causing subscriber station output to increase and uplink interference to increase
Solution Approach 1:
The patent segments uplink traffic into HARQ traffic and non-HARQ traffic, applying different target PER values to each segment. HARQ traffic uses a higher target PER (e.g., 10-30%) while non-HARQ traffic uses a lower target PER (e.g., <1%), allowing differentiated power control strategies for different traffic types rather than applying a uniform target PER to all uplink traffic
Solution Approach 2:
The patent dynamically adjusts the target PER based on traffic type and channel conditions. The base station determines whether to apply HARQ or non-HARQ power control parameters depending on the specific traffic characteristics, enabling adaptive power control that responds to changing network conditions and traffic requirements
2Reliability
If the HARQ scheme is employed, then wireless link reliability is improved and higher target PER can be used, but power control differentiation between HARQ and non-HARQ traffic is lacking, causing target-PER mismatch
Solution Approach 1:
The patent divides power control parameters into separate sets for HARQ traffic and non-HARQ traffic. The base station maintains different target PER values and power control parameters for each traffic type, selecting the appropriate parameter set based on the traffic characteristics, thereby achieving both high reliability through HARQ and adaptability through differentiated control
Solution Approach 2:
The patent changes the power control parameters (specifically target PER values) based on the traffic type. By switching between different parameter sets (HARQ parameters vs. non-HARQ parameters), the system adapts its power control behavior to match the requirements of the current traffic, resolving the target-PER mismatch problem
3Productivity
If a higher target PER is used for non-HARQ traffic, then uplink capacity and coverage area increase, but reliability of non-HARQ traffic decreases
Solution Approach 1:
The patent segments power control parameters by traffic type, allowing non-HARQ traffic to use a lower target PER (e.g., <1%) for high reliability while HARQ traffic uses a higher target PER (e.g., 10-30%) for higher capacity. This segmentation enables each traffic type to operate at its optimal point without compromising the other
Data Source
AI summary
Disclosed is a method for uplink power control in a communication system that includes determining a power control offset for controlling power for traffic to be transmitted by a subscriber station, according to whether a Hybrid Automatic Repeat reQuest (HARQ) is applied to the traffic, and transmitting the power control offset to the subscriber station.