Cell Scrambling Code Selection for Wireless Node B Identification
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Solution Overview
Problem
The existing cellular wireless communication systems face challenges in distinguishing between Node Bs, especially when Home Node Bs are used, as the limited number of cell IDs (510) can lead to communication problems due to insufficient identification capabilities.
Innovation Solution
The method involves selecting and generating multiple cell scrambling codes for each combination of Primary Scrambling Codes (PSCs) and Secondary Scrambling Codes (SSCs), allowing for the use of additional cell scrambling codes beyond the standard 510 combinations, thereby expanding the number of possible cell IDs and improving cell search efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the limited number of cell IDs (510) is used for Node B identification, then the system maintains simplicity in cell search process, but the ability to distinguish between Node Bs becomes insufficient especially when Home Node Bs are deployed
Solution Approach 1:
The cell ID identification process is segmented into two stages: first identifying the cell group ID from S-SCH, then identifying the specific cell ID within that group from P-SCH. This segmentation allows the system to support more Node Bs by dividing the identification space while maintaining a manageable search process at each stage.
Solution Approach 2:
The patent introduces an additional dimension to cell ID identification by using hierarchical structure (cell group ID + cell ID within group). Instead of a single 510-cell limit, the system creates a multi-dimensional identification space that can accommodate more Node Bs through combinations of group identifiers and individual cell identifiers.
2Quantity of substance
If multiple cell scrambling codes are generated for each PSC-SSC combination, then the number of possible cell IDs increases beyond 510, but the complexity of code generation and management increases
Solution Approach 1:
The system pre-generates multiple cell scrambling codes for each PSC-SSC combination and stores them in advance. This preliminary action allows the network to quickly assign appropriate cell IDs without complex real-time generation, reducing operational complexity while maintaining a large pool of available cell IDs.
Solution Approach 2:
The patent changes the parameter of scrambling code variety by allowing multiple cell-specific scrambling codes to be associated with each PSC-SSC combination. This parameter change enables the system to generate more unique cell identifiers without fundamentally changing the underlying code structure or generation methodology.
Data Source
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AI summary
A method and apparatus for transmitting a pilot signal in a wireless communication system. A reference cell scrambling code or one of a plurality of additional cell scrambling codes is selected for each combination of one of a plurality of first scrambling codes (PSCs) applied to a first synchronization channel (P-SCH) and one of a plurality of second scrambling codes (SSCs) applied to a second synchronization channel (S-SCH). It is determined whether to transmit the pilot signal using the reference cell scrambling code or one of the plurality of additional cell scrambling codes. The reference cell scrambling code or the additional cell scrambling code is generated according to the determination. The pilot signal is transmitted using the generated reference cell scrambling code or the additional cell scrambling code.