MCS Selection Using PER-Adjusted CINR in WiMAX
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Solution Overview
Problem
In WiMAX technology, existing methods for selecting a Modulation and Coding Scheme (MCS) based solely on the Carrier to Interference plus Noise Ratio (CINR) often result in overestimation or underestimation, leading to inefficient packet transmission and wastage of wireless resources due to the averaged nature of CINR, which does not accurately reflect channel environments.
Innovation Solution
A method that calculates the Packet Error Rate (PER) and adjusts the CINR return value using adjustment coefficients to determine an actual return value, allowing for the selection of an appropriate MCS that better reflects communication quality, thereby preventing overestimation or underestimation of CINR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If MCS is selected based solely on CINR, then the selection process is simple, but the accuracy of reflecting actual communication quality deteriorates
Solution Approach 1:
The patent changes the parameter used for MCS selection from CINR alone to a corrected CINR value that incorporates PER information. By adjusting the CINR parameter based on packet error rate feedback, the system achieves more accurate communication quality assessment while maintaining operational simplicity through automated correction mechanisms.
Solution Approach 2:
The patent implements a feedback mechanism where the CPE sends PER information back to the BS, which then uses this feedback to correct the CINR value before MCS selection. This closed-loop feedback system ensures that the MCS selection accurately reflects actual communication quality by incorporating real-time performance data.
2Productivity
If high modulation mode is selected when CINR is overestimated, then transmission rate increases, but packet error rate increases and transmission efficiency decreases
Solution Approach 1:
The patent uses PER feedback from the CPE to correct CINR estimates at the BS. This feedback mechanism prevents overestimation of CINR, thereby avoiding selection of excessively high modulation modes that would cause packet errors, while still allowing high transmission rates when communication quality is actually good.
Solution Approach 2:
The patent modifies the CINR parameter by incorporating PER information to produce a corrected CINR value. This parameter adjustment ensures that the MCS selection balances transmission rate and reliability by reflecting actual communication conditions rather than relying on potentially inaccurate CINR estimates alone.
3Reliability
If low modulation mode is selected when CINR is underestimated, then packet error rate decreases, but wireless resources are wasted
Solution Approach 1:
The patent implements feedback from the CPE regarding actual packet error rates to the BS. This feedback enables the BS to accurately assess communication quality and select appropriate modulation modes, preventing underestimation of CINR and avoiding unnecessary use of low modulation modes that would waste wireless resources.
Solution Approach 2:
The patent adjusts the CINR parameter by incorporating PER data to create a more accurate corrected CINR value. This parameter change ensures that the MCS selection optimizes both reliability and resource utilization by selecting the highest appropriate modulation mode based on actual channel conditions rather than potentially biased CINR measurements.
Data Source
AI summary
A Base Station (BS) communication module and a Customer Premise Equipment (CPE) communication module are adapted to implement a method for selecting a Modulation and Coding Scheme (MCS). The method for selecting an MCS includes the following steps: receiving a plurality of first packets in a first period, and calculating a Packet Error Rate (PER); determining whether the PER is greater than an error rate threshold; and when the PER is greater than the error rate threshold, performing the following steps: obtaining a Carrier to Interference plus Noise Ratio (CINR) return value; performing an adjusting procedure to obtain a CINR adjustment value; calculating an actual return value according to the CINR return value and the CINR adjustment value; and selecting one of a plurality of MCSs according to the actual return value.