Broadcast Channel Information Transmission Using Scrambling Codes
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Solution Overview
Problem
Current broadcast channel (BCH) transmission methods in cellular systems face challenges in demodulation performance due to low signal-to-interference noise ratio (SINR) conditions and inefficient use of time and frequency resources, particularly when terminals need to decode BCH information from neighboring base stations with similar signal strengths.
Innovation Solution
The proposed method involves channel-coding BCH information every frame within a transmission time interval (TTI) and using different scrambling codes for each frame, allowing terminals to perform blind decoding and soft-combining, which reduces decoding delay and improves resource utilization even in low SINR conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If BCH is transmitted through minimum bandwidth to ensure coverage, then system coverage is improved, but demodulation performance deteriorates
Solution Approach 1:
The patent divides the BCH transmission into multiple segments across different frames, each segment containing parts of the BCH information. The terminal combines these segmented transmissions to reconstruct the complete BCH, thereby achieving reliable demodulation even when individual transmissions occur on limited bandwidth resources.
Solution Approach 2:
The patent applies scrambling codes to BCH segments in advance before transmission. This preliminary scrambling operation enables the terminal to distinguish between signals from different base stations and perform effective soft-combining, improving demodulation performance without requiring wider bandwidth.
2Reliability
If channel coding rate is reduced to ensure reliable demodulation in low SINR, then demodulation reliability is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent combines multiple BCH transmissions from different frames using soft-combining at the terminal. By merging these transmissions, the effective coding rate is improved without actually reducing the channel coding rate, thereby maintaining both reliability and transmission efficiency.
Solution Approach 2:
The patent changes the scrambling code parameter for each frame's BCH transmission. This parameter change enables the terminal to identify and combine signals from different transmissions, achieving the benefits of lower effective coding rate while maintaining the original high coding rate for efficient transmission.
3Productivity
If different scrambling codes are used for each frame, then resource utilization is improved, but decoding complexity increases
Solution Approach 1:
The patent uses the scrambling code information as feedback to guide the decoding process. The terminal uses the known scrambling code sequence to descramble and combine signals from different frames, transforming what would be increased complexity into a structured, manageable process that actually simplifies resource utilization.
Data Source
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AI summary
A signal transmitting method according to an exemplary embodiment of the present invention includes channel-coding broadcasting channel information by using a first scrambling code in a first frame within a broadcasting channel information updating period including a plurality of frames, and channel-coding the broadcasting channel information by using a second scrambling code in a second frame within the broadcasting channel information updating period. The second scrambling code is different from the first scrambling code.