Frame Synchronization Signal Encoding for Consistent Short Code Magnitude
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Solution Overview
Problem
Existing encoding methods for secondary synchronization channel (S-SCH) codewords in mobile communication systems do not consistently ensure that the first short code is larger than or smaller than the second short code, leading to unreliable frame synchronization due to varying short code distances and magnitude relations.
Innovation Solution
A method that encodes a predefined intermediate variable corresponding to a cell ID or cell group ID to generate S-SCH codewords, ensuring that the first short code is consistently larger or smaller than the second short code, with a short code distance kept relatively small by adjusting the intermediate variable through specific offset additions and equations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing encoding methods are used to generate S-SCH codewords, then the encoding process is simple, but the first short code and second short code do not consistently satisfy the magnitude relationship requirement, leading to unreliable frame synchronization
Solution Approach 1:
The patent introduces an intermediate variable N that transforms the direct encoding of cell ID into a two-step process: first encoding cell ID to N, then encoding N to obtain the short code pair (s0, s1). This parameter transformation ensures that s0 < s1 consistently for all cell IDs, resolving the reliability issue while maintaining manageable encoding complexity through mathematical formulation
Solution Approach 2:
The intermediate variable N serves as a mediator between the cell ID and the final short code pair. By introducing this intermediary step, the patent achieves consistent magnitude relationships between short codes without requiring complex direct encoding logic, thus improving synchronization reliability while keeping the encoding process manageable
2Measurement precision
If the short code distance |s0 - s1| is made small to reduce ambiguity, then synchronization accuracy improves, but the encoding method becomes more complex
Solution Approach 1:
The patent uses the intermediate variable N to control the short code distance. By encoding N according to specific mathematical relationships, the method ensures that the short code distance |s0 - s1| remains small (specifically, the difference is at most 1) for all cell IDs, thereby improving synchronization accuracy while maintaining a systematic and not overly complex encoding approach
Data Source
Figure 1~2
AI summary
An encoding method for a frame synchronization signal includes: encoding a predetermined intermediate variable corresponding to a cell ID or cell group ID to obtain short codes corresponding to the cell ID or cell group ID; and generating SCH codewords according to the said short codes, instead of directly encoding the cell ID or cell group ID, thereby ensuring that a first short code in each generated S-SCH codeword is larger than a second short code, or a first short code in each generated S-SCH codeword is smaller than a second short code, and a short code distance thereof is relatively small, so as to enhance the reliability of the frame synchronization. An encoding apparatus for a frame synchronization signal is further provided.