Polar-Coded Identifier Insertion for Massive Terminal Access
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Solution Overview
Problem
Existing wireless network communication systems, such as LTE and 5G, face limitations in identifying a large number of terminals due to the limited length of the radio network temporary identifier (RNTI) sequence, which restricts the number of terminals that can be identified to 65536, failing to meet the requirements of massive access scenarios.
Innovation Solution
The proposed solution involves adding an identifier sequence to an encoded polar code, increasing its length from 16 bits to N bits, allowing for up to 2^N terminal identifications, while maintaining low hardware overheads by ensuring encoded bits remain 0 at fixed locations, and using scrambling and interleaving operations to flexibly integrate the identifier sequence into the encoded bit sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the RNTI sequence length is limited to 16 bits in the existing system, then the scrambling operation can be performed efficiently, but the quantity of terminals that can be identified is restricted to 65536
Solution Approach 1:
The patent changes the parameter of identifier sequence length from the fixed 16 bits to a variable length up to N bits (where N is the polar code length). This is achieved by performing scrambling operations between the polar code bits and the identifier sequence bits, allowing the system to support up to 2^N terminals while maintaining efficient processing through the polar code structure.
2Productivity
If the identifier sequence length is increased to support massive access scenarios, then more terminals can be identified, but the hardware overheads increase
Solution Approach 1:
The patent applies preliminary action by pre-freezing certain bits in the polar code to zero before encoding. This allows the identifier sequence to be integrated into the encoded bit sequence without requiring additional hardware resources for these frozen positions, thereby supporting extended identifier lengths while maintaining low hardware overheads.
Solution Approach 2:
The patent merges the identifier sequence integration with the polar code encoding process itself. By combining the identifier sequence with the polar code bits through scrambling operations and utilizing the frozen bit structure, the system achieves terminal identification without requiring separate hardware overheads, thus supporting massive access scenarios efficiently.
Data Source
AI summary
An information adding method and apparatus, to increase a quantity of terminals that can be represented by an identifier sequence. The method includes: performing, by a transmit end, polar code encoding on a first bit sequence to generate an encoded second bit sequence; adding, by the transmit end, a part or all of an identifier sequence to the second bit sequence to generate a third bit sequence, where the identifier sequence is used to identify a terminal; and sending, by the transmit end, the third bit sequence.