PBCH Polar Coding With Implicit Timing Index Transmission
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Solution Overview
Problem
The direct application of Polar code to the Physical Broadcast Channel (PBCH) in 5G communication systems poses several challenges, including the need for effective timing index indication and efficient channel encoding, which are not adequately addressed by existing technologies.
Innovation Solution
A Polar code transmission method and apparatus that encodes a bit sequence with known bits in frozen positions and information bits, using a transformation matrix to generate multiple copies of the code sequence, which implicitly convey different time stamp information, suitable for PBCH transmission in 5G systems, reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Polar code is directly applied to PBCH transmission, then channel encoding efficiency is improved, but timing index indication capability deteriorates
Solution Approach 1:
The patent merges the timing index information with the PBCH data by encoding both together using Polar code. The timing index bits are concatenated with the PBCH payload before Polar encoding, allowing simultaneous transmission of both data and timing information through the same code structure, thus resolving the contradiction between encoding efficiency and timing indication capability
Solution Approach 2:
The Polar code structure is designed to serve multiple functions: it simultaneously performs channel encoding for error protection and timing index indication. By making the code structure universal that can handle both data transmission and timing information conveyance, the patent eliminates the need for separate mechanisms for each function
2Reliability
If multiple PBCH segments are transmitted with different scrambling sequences, then reliability in poor channel conditions is improved, but device complexity increases
Solution Approach 1:
The patent extracts the timing index information from the scrambled PBCH segments and makes it explicitly available through the Polar code structure. By separating the timing indication function from the scrambling process, the system maintains multiple segments for reliability while simplifying the management of scrambling sequences, as the timing information is now directly encoded rather than hidden in scrambling patterns
Data Source
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AI summary
Embodiments of the application provide a Polar code transmission method, the method comprising: encoding, by a network device, a bit sequence into a code sequence using Polar code, wherein the bit sequence contains a control signaling and a Cyclic Redundancy Code (CRC) sequence; and transforming, by the network device, the code sequence into M copies, wherein an ist information copy of the M copies multiples by a first matrix of the power of (i-1), M is an integer and M>0, 1≤i≤M. A Polar code transmission apparatus is also provided. By using the above method and apparatus, M copies of codeword x was encoded by Polar code, the M copies implicitly conveys different time stamp information, which is suitable for the transmission of PBCH in 5G communication system, signaling overhead is also reduced.