Partial Bit Allocation Table Update for Multicarrier Channel Adaptation
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Solution Overview
Problem
Conventional channel adaptation processes in multicarrier modulation systems are inefficient and time-consuming, leading to service interruptions under rapidly changing channel conditions, as they require lengthy control message exchanges and retraining of transceivers.
Innovation Solution
Implementing a partial Bit Allocation Table (BAT) update mechanism that piggybacks update information in existing frame formats, such as acknowledgement frames, to rapidly and efficiently reallocate bits and gains across tones, eliminating the need for additional control messages and reducing retraining frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel adaptation processes are used, then channel conditions can be adjusted, but service interruptions occur and connection reliability deteriorates under rapidly changing channel conditions
Solution Approach 1:
The patent segments the Bit Allocation Table (BAT) update process by introducing a differential BAT that contains only the changed elements (delta values) rather than transmitting the entire BAT. This segmentation allows for faster, more efficient channel adaptation by transmitting only the necessary updates, thereby reducing adaptation time and maintaining connection reliability under rapidly changing channel conditions.
Solution Approach 2:
The patent implements preliminary action by pre-defining a set of possible BAT elements and their corresponding differential values before channel adaptation is needed. This pre-preparation of differential BAT data enables immediate channel adaptation when conditions change, eliminating the need for lengthy real-time calculations and control message exchanges, thus reducing service interruptions and maintaining reliability.
2Productivity
If conventional channel adaptation processes are used, then channel conditions can be adjusted, but control message exchanges and retraining become lengthy and inefficient
Solution Approach 1:
The patent extracts only the essential channel adaptation information by creating a differential BAT that contains merely the changed elements from the original BAT. This extraction eliminates unnecessary data transmission and processing, allowing for rapid channel adaptation without lengthy control message exchanges or full retraining sequences, thereby improving productivity and reducing time loss.
Solution Approach 2:
The patent changes the parameter representation from absolute BAT values to differential BAT values (delta values). This parameter transformation enables more compact and efficient transmission of channel adaptation information, reducing the time required for retraining and improving overall adaptation efficiency by focusing only on what has changed.
Data Source
AI summary
Implementations related to updating channel adaptation parameters are described. In one implementation, an R2T frame, such as an acknowledgment (ACK) frame, is modified to carry a partial bit allocation table (BAT). The R2T frame may be received by a transceiver apparatus and the partial BAT carried in the header or extended header(s) of R2T frame may be used to update a BAT stored in the transceiver. In another implementation, a message frame is modified to carry a partial BAT. The message frame may be received by a transceiver apparatus and the partial BAT used to update a BAT stored in the transceiver. A unique identification number generated by the receiving transceiver apparatus may be used to synchronize BATs stored in two communicating transceivers without necessity of exchanging additional control messages.