Subcarrier Information Indication Method for Extended Bit Capacity
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Solution Overview
Problem
The existing DSL technology is unable to efficiently represent and transmit more than 15 bits of information using subcarriers due to the limitation of four binary bits, leading to incompatibility and line activation failures when the number of bits carried by a subcarrier exceeds this limit.
Innovation Solution
The method involves selecting an offset within a range of 0 to 15, combining it with the existing four-bit representation to represent a larger quantity of bits, allowing subcarriers to carry more than 15 bits by using the formula b̂ = b + offset, where b is the original four-bit value and offset is used to extend the bit representation, enabling the subcarriers to carry up to 18 bits or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the quantity of bits carried by a subcarrier is increased beyond 15 bits, then the information transmission capacity is improved, but the compatibility with existing four-bit representation systems deteriorates, leading to line activation failure
Solution Approach 1:
The patent introduces a new dimension to the existing four-bit representation by adding an offset parameter. Instead of directly representing the bit quantity with four bits (0-15), the system now uses four bits to represent an offset value, and the actual bit quantity is calculated as offset + base_value. This dimensional transformation allows the system to represent larger bit quantities (beyond 15) while maintaining compatibility with the existing four-bit message format.
Solution Approach 2:
The patent changes the parameter representation method by introducing an offset mechanism. The original direct mapping (4 bits = 0-15 bit quantities) is transformed into an offset-based mapping where four bits represent an offset that is added to a base value. This parameter change enables the system to indicate larger bit quantities (e.g., 16-31 bits or more) while keeping the message format unchanged, thus resolving the contradiction between increased capacity and system compatibility.
2Productivity
If the maximum quantity of bits per subcarrier is increased to 18 bits or more, then the system processing rate is improved, but the existing message format using four bits to represent subcarrier bit quantity becomes insufficient
Solution Approach 1:
The patent uses the existing four-bit message format as a template and creates a new representation scheme that copies the structure but changes the interpretation. Instead of directly encoding bit quantities 0-15, the system copies the four-bit format structure and uses it to encode offset values, which are then added to a base value to achieve the desired bit quantities. This copying approach allows the system to maintain the original message format simplicity while achieving extended functionality.
Solution Approach 2:
The patent performs preliminary action by pre-defining offset values and base values before actual data transmission. The offset mechanism is established in advance, allowing the system to efficiently represent large bit quantities without complex real-time calculations. This preliminary setup enables the system to achieve high processing rates (18 bits or more per subcarrier) while keeping the message format simple and compatible with existing infrastructure.
Data Source
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AI summary
The present invention provides a subcarrier information indicating method, including: selecting an offset according to a maximum quantity of bits that a subcarrier is capable of carrying, where a difference between the maximum quantity of bits that the subcarrier is capable of carrying and the selected offset is greater than 0 and less than or equal to 15 (201); obtaining a difference obtained by subtracting the offset from a quantity of bits that need to be actually carried by the subcarrier, and if the difference is not less than 0, sending the difference to a peer device as a value b (203); and sending the offset to the peer device, and instructing the peer device to obtain, according to the value b and the offset, the quantity of bits that need to be actually carried by the subcarrier (205). The method can not only be compatible with an existing mode, but also implement a mode of carrying more than 15 bits by a subcarrier. Therefore, a subcarrier carrying capability supported by a device can be used to a maximum extent.