Hyperframe Framing Structure for Flexible Data Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional framing structures in high-speed digital communication systems, such as ADSL and VDSL, impose constraints that hinder fine control over the information transmission rate on the control channel and limit flexible user data allocation.
Innovation Solution
A block-based hyper-frame framing structure is introduced, where the allocation of control channel information is unequally distributed among frames based on their position in the hyperframe, allowing for flexible user data allocation and improved control over bandwidth, with a multiplexer and block encoder used to assemble and transmit multiplexed data frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional framing structures are used, then system compatibility is maintained, but fine control over control channel transmission rate is hindered
Solution Approach 1:
The hyperframe is segmented into multiple frames with different positions, where each frame can have different allocations of control channel octets. This segmentation allows the system to achieve fine control over control channel transmission rate by adjusting the number of control octets in specific frame positions without requiring a complete redesign of the framing structure.
Solution Approach 2:
The framing structure transitions from a static, uniform allocation to a dynamic allocation where the number of control channel octets varies by frame position within the hyperframe. This dynamic approach enables adaptive control of the control channel rate while maintaining the overall hyperframe structure for compatibility.
2Adaptability or versatility
If conventional framing structures are used, then structural simplicity is maintained, but flexible user data allocation is limited
Solution Approach 1:
Different frames within the hyperframe are assigned different qualities in terms of control channel octet allocation based on their position. This allows user data to be allocated flexibly in frames where fewer control octets are needed, while maintaining adequate control channel capacity in frames where it is more critical, achieving local optimization throughout the hyperframe.
Solution Approach 2:
The number of control channel octets is changed as a parameter depending on the frame position within the hyperframe. By varying this parameter across different frames, the system achieves flexible user data allocation while maintaining necessary control channel capacity where needed.
3Productivity
If unequal allocation of control channel information is implemented, then transmission efficiency is enhanced, but frame structure complexity increases
Solution Approach 1:
The unequal allocation of control channel octets to different frame positions is predetermined and structured in the hyperframe design. This preliminary arrangement simplifies the multiplexing and demultiplexing processes compared to dynamic reallocation, as the receiver can anticipate the allocation pattern based on frame position, thereby maintaining transmission efficiency without excessive complexity.
Data Source
AI summary
Digital data is transmitted in a block-based hyperframe that consists of N frames. Each frame carries multiplexed data from one or more user data channels and a control channel. Control channel information is unequally allocated among the N frames, the amount of information carried in each frame varying according to the frame's position in the hyperframe. All of the user data channels except one carry a predetermined number of transmission units in each frame. The excepted user data channel carries a calculated amount needed to round out the particular frame. Following multiplexing, a block encoder defines the frames and adds error detection or error correction information. The number of frames per hyperframe and the total number of transmission units for the control channel are available to a receiver, which can then demultiplex the hyperframe.