Supplementary Channel Descriptors for Modulation Adaptation

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Solution Overview

Problem

In wireless communication systems adhering to the IEEE 802.16e standard, mobile stations face performance issues due to long intervals between channel descriptor transmissions, making it difficult to detect and adapt to changes in modulation schemes by base stations, leading to potential communication disruptions.

Innovation Solution

The method involves transmitting supplementary channel descriptors during the intervals between regular channel descriptors, along with a channel descriptor count and pointer, to quickly inform mobile stations of modulation scheme changes, allowing for timely adaptation and reducing wait times.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If regular channel descriptors are transmitted at long intervals (up to ten seconds) as per IEEE 802.16e standard, then transmission overhead is reduced, but the mobile station cannot detect modulation scheme changes timely, causing performance degradation

Engineering Contradiction:

Improvetransmission overheadVSAvoiddetection delay

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The channel descriptor transmission is segmented into regular channel descriptors (transmitted at long intervals to reduce overhead) and supplementary channel descriptors (transmitted at shorter intervals to enable timely detection of modulation scheme changes). This segmentation allows the system to simultaneously reduce transmission overhead while maintaining timely detection capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The supplementary channel descriptors serve as simplified copies or updates of the full channel descriptor information, containing specifically the modulation scheme change notifications. This allows mobile stations to detect changes without receiving complete channel descriptor information at every interval, reducing overhead while maintaining detection capability.

Inventive Principle:

Principle #26Copying

2Productivity

If the mobile station waits for the next regular channel descriptor to detect modulation changes, then transmission resources are conserved, but communication performance is severely affected due to up to ten seconds of operational disruption

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidcommunication continuity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The base station performs preliminary action by transmitting supplementary channel descriptors that notify mobile stations of modulation scheme changes before the next regular channel descriptor arrives. This preliminary notification allows mobile stations to prepare for and adapt to modulation changes without waiting for the full interval, maintaining communication continuity while conserving resources.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If supplementary channel descriptors are transmitted frequently to enable timely detection of modulation changes, then mobile station adaptability improves, but transmission overhead increases

Engineering Contradiction:

Improvemodulation scheme adaptabilityVSAvoidtransmission overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The supplementary channel descriptors contain localized, specific information about modulation scheme changes rather than complete channel descriptor information. This local quality approach allows frequent transmission of change notifications without the overhead of transmitting full descriptor information repeatedly, enabling timely adaptability while controlling transmission overhead.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS7826419B2Method and system to improve transmission and receipt of channel descriptors

Publication Date: 2010.11.02 GOOGLE TECHNOLOGY HOLDINGS LLC

AI summary

The invention concerns a method (200) and system for improving transmission or receipt of channel descriptors. The method can include the steps of—in a wireless communication system (100) that periodically broadcasts regular channel descriptors (310) at a set interval (312)—changing (212) a modulation scheme and transmitting (216) one or more supplementary channel descriptors (314) during the set interval between regular channel descriptors. The method can also include the step of periodically transmitting (214) a channel descriptor count (412) that provides an indication of the changed modulation scheme.