Dynamic TDD Frame Structure for DSL Bandwidth Optimization
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Solution Overview
Problem
Current synchronous TDD-based DSL communication systems have a static frame structure that leads to fixed nominal asymmetry ratios between downstream and upstream data rates, resulting in inefficient bandwidth usage and increased power consumption due to the constant transmission of dummy bits or symbols.
Innovation Solution
Implementing a dynamic TDD frame structure that adjusts the flexible time periods for downstream and upstream transmissions based on a nominal asymmetry ratio, allowing for online reconfiguration and discontinuous operation to conserve power by turning off transmission paths during idle periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static TDD frame structure is used to allocate fixed communication capacities for upstream and downstream transmissions, then the system maintains simple and stable operation during initialization, but the system cannot efficiently manage asymmetric transmissions during the showtime state when actual data rates are lower than allocated capacities
Solution Approach 1:
The patent applies dynamics by transitioning from a static frame structure to a dynamic one that can be reconfigured during the showtime state. The control entity calculates new flexible time period values based on current traffic conditions and nominal asymmetry ratios, allowing the TDD frame structure to adapt in real-time to changing transmission requirements and asymmetric data rates.
Solution Approach 2:
The patent changes the parameter of time period allocation dynamically. The control entity determines new flexible time period values based on current traffic conditions and adjusts the nominal asymmetry ratio between upstream and downstream transmissions. This parameter change allows the system to reallocate communication capacity according to actual demand rather than fixed pre-configured values.
2Reliability
If dummy bits or symbols are transmitted constantly to compensate for low actual data rates, then the system maintains stable signal transmission and connection, but the system wastes bandwidth and increases power consumption
Solution Approach 1:
The patent extracts and removes the unnecessary dummy bits or symbols from the transmission. By dynamically adjusting the TDD frame structure and flexible time periods based on actual traffic conditions, the system eliminates the need for constant dummy transmission, thereby reducing power consumption and wasting no more bandwidth while maintaining connection stability through proper capacity reallocation.
Solution Approach 2:
The patent implements periodic reconfiguration of the TDD frame structure based on traffic conditions. The control entity periodically calculates and applies new flexible time period values, allowing the system to adapt to varying data rates without requiring continuous dummy transmission. This periodic adjustment maintains reliability while avoiding the energy waste of constant dummy bit transmission.
3Productivity
If communication capacity is reallocated dynamically based on current traffic demands, then the system optimizes bandwidth usage and reduces power consumption, but the system requires complex control mechanisms for online reconfiguration
Solution Approach 1:
The patent implements feedback mechanisms where the control entity monitors current traffic conditions and actual data rates, then uses this information to calculate appropriate flexible time period values and nominal asymmetry ratios. This feedback loop enables dynamic reallocation of communication capacity to optimize bandwidth usage and reduce power consumption while managing the control complexity through systematic monitoring and adjustment processes.
Data Source
AI summary
An access node for digital subscriber line (DSL) communication comprising a transceiver configured to couple to a subscriber line, and a control entity coupled to the transceiver, wherein the control entity is configured to receive a request to switch to a nominal asymmetry ratio between an upstream data rate and a downstream data rate after initialization of the subscriber line, determine a flexible time period value based on the nominal asymmetry ratio, wherein the flexible time period is used to define a time division duplexing (TDD) frame structure, and forward a message that comprises the flexible time period value to the transceiver, wherein the transceiver is configured to transmit an upstream transmission using the TDD frame structure over the subscriber line, and receive a downstream transmission using the TDD frame structure over the subscriber line.