Concatenated Downstream Payloads with Progressive Modulation
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Solution Overview
Problem
In Access Networks using Time-Division Duplexing (TDD), the overhead of preambles in downstream traffic transmissions reduces temporal efficiency and limits the ability to use high modulation profiles for nearby CPEs, resulting in suboptimal channel utilization and throughput.
Innovation Solution
The method of concatenating downstream payloads in rank order of progressively increasing modulation profiles, eliminating the need for intervening preambles and allowing all CPEs to detect and decode the signal from a single preamble, thereby reducing overhead and enhancing channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preambles are transmitted before each downstream payload to enable CPE detection and decoding, then CPEs can reliably receive and decode signals, but preamble overhead increases reducing temporal efficiency and downstream throughput
Solution Approach 1:
The patent merges multiple downstream payloads with different modulation profiles into a single concatenated transmission stream. By combining these payloads and using a single preamble for the entire concatenated stream, the system eliminates the need for separate preambles before each payload, thereby reducing overhead while maintaining reliable detection and decoding across different CPEs with varying channel conditions.
Solution Approach 2:
The single preamble transmitted before the concatenated payloads serves multiple functions simultaneously: it enables signal detection and decoding for all CPEs regardless of their distance or channel conditions, and it supports multiple modulation profiles within the same transmission stream. This universal preamble approach eliminates the need for CPE-specific preambles, reducing overall overhead.
2Speed
If high modulation profiles are used for nearby CPEs to increase information rates, then throughput for nearby CPEs improves, but the presence of preambles reduces temporal efficiency and limits overall channel utilization
Solution Approach 1:
The patent combines multiple payloads with different modulation profiles (including high modulation profiles for nearby CPEs) into a single concatenated stream. This merging allows high information rates for nearby CPEs using high modulation profiles while eliminating the time loss associated with transmitting separate preambles for each payload, thereby improving temporal efficiency.
3Adaptability or versatility
If multiple preambles are transmitted for different modulation profiles in downstream traffic, then each CPE can properly detect and decode its intended signal, but overhead increases reducing channel utilization efficiency
Solution Approach 1:
The patent merges multiple payloads with different modulation profiles into a single concatenated transmission. This approach maintains adaptability to support multiple modulation profiles for different CPEs while eliminating the need for multiple preambles, thereby preventing energy loss and improving channel utilization efficiency.
Solution Approach 2:
The single preamble before the concatenated payloads performs a universal function of enabling detection and decoding for all modulation profiles used in the concatenated stream. This universal approach maintains versatility in supporting multiple modulation profiles while eliminating the overhead of multiple CPE-specific preambles.
Data Source
AI summary
A method, system and computer program for transmitting at least two payloads in a downstream traffic phase of a time-division duplex (TDD) cycle with a single preamble from a headend followed by concatenated payloads without intervening preambles, whereby the payloads are ranked by increasing modulation profiles. The preamble, and concatenated and ordered set of payloads are then transmitted to two or more predetermined customer premise equipments (CPEs).