Link Adaptation Apparatus for Wireless Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication networks face challenges in maintaining Quality of Service (QoS) for different types of traffic, as current channel quality parameters like PCINR and ECINR do not accurately reflect uplink conditions or provide QoS-specific information, leading to increased signaling overhead and computational complexity.
Innovation Solution
A method and apparatus for link adaptation that computes a first channel quality parameter at predefined intervals, determines a correction parameter based on transmission parameters, and schedules a transmission mode using a second channel quality parameter estimated from the first and correction parameters, considering QoS requirements for each Mobile Station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ECINR values are reported frequently for multiple MSs, then QoS requirements can be met, but signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary QoS-specific information from channel quality measurements rather than reporting complete ECINR values. The base station determines transmission parameters based on extracted QoS requirements and channel conditions, reducing the amount of signaling data that needs to be transmitted while still meeting QoS requirements for different traffic types.
2Measurement precision
If MCS is determined frequently from ECINR values, then link adaptation accuracy improves, but computational complexity at MS increases
Solution Approach 1:
The patent introduces an intermediary approach where the base station performs the complex MCS determination and transmission parameter selection based on QoS requirements. The mobile station only needs to report channel quality measurements and receive transmission parameters, avoiding complex real-time computations at the MS while maintaining accurate link adaptation through base station processing.
3Ease of manufacture
If PCINR value is used for channel quality assessment, then measurement is simple, but actual link conditions and decoding ability are not accurately reflected
Solution Approach 1:
The patent transitions from using simple PCINR measurements to incorporating QoS-specific parameters and multiple channel quality metrics. The base station determines transmission parameters based on QoS requirements and channel conditions, changing the parameter set from simple signal strength to a more comprehensive assessment that includes decoding ability and actual link conditions.
Data Source
AI summary
A method and apparatus for link adaptation in a wireless communication network is provided. The method includes computing a first channel quality parameter based on one or more channel quality parameters. The one or more channel quality parameters are associated with a communication link between a Mobile Station (MS) and a Base Station (BS). The method further includes determining a qualifying transmission unit to compute a correction parameter. The correction parameter is computed based on the first channel quality parameter and one or more transmission parameters. The one or more transmission parameter is associated with the communication link. Thereafter, the method schedules a transmission mode of the communication link based on a second channel quality parameter. The second channel quality parameter is estimated based the first channel quality parameter and the correction parameter.