Multiplexing Synchronous and Broadcasting Channels in LTE NCT Cells
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Solution Overview
Problem
In LTE systems, the transmission of synchronous channels and broadcasting channels is hindered by conflicts with DMRS, CSI-RS, and TRS signals, limiting the flexibility and compatibility of new carrier type (NCT) cells, which prevents legacy UEs from accessing NCT cells and reduces system efficiency.
Innovation Solution
The method involves generating and transmitting synchronous and broadcasting channels on specific OFDM symbols that do not overlap with DMRS, CSI-RS, or TRS signals, allowing for flexible configuration and ensuring compatibility by using alternative time-frequency positions for P-SCH, S-SCH, and P-BCH channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If synchronous channels and broadcasting channels are transmitted on conventional OFDM symbols, then signal transmission is achieved, but conflicts with DMRS, CSI-RS, and TRS signals occur, limiting flexibility and compatibility
Solution Approach 1:
The patent resolves signal conflicts by transitioning from conventional OFDM symbol allocation to a new dimension of resource allocation using specific OFDM symbols designated for NCT cells. This dimensional separation ensures that synchronous channels (P-SCH, S-SCH) and broadcasting channels (P-BCH) are mapped to OFDM symbols that do not overlap with DMRS, CSI-RS, or TRS signals, thereby eliminating harmful signal conflicts while maintaining transmission effectiveness.
Solution Approach 2:
The patent applies local quality by assigning specific, dedicated OFDM symbols for NCT channel transmissions rather than using general-purpose symbols. This localized allocation ensures that particular OFDM symbols are optimized for synchronous and broadcasting channels without interfering with other signal types, thereby improving both flexibility and compatibility in NCT cell operations.
2Adaptability or versatility
If legacy UEs are to access NCT cells, then compatibility is improved, but signal conflicts prevent successful access
Solution Approach 1:
The patent introduces specifically designated OFDM symbols as intermediaries between legacy UEs and NCT cells. These intermediary symbols serve as dedicated carriers for synchronous and broadcasting channels, enabling legacy UEs to access NCT cells without encountering signal conflicts with DMRS, CSI-RS, or TRS, thereby ensuring both compatibility and reliable access.
3Productivity
If channel allocation is optimized to avoid conflicts, then system efficiency improves, but configuration complexity increases
Solution Approach 1:
The patent optimizes system efficiency by changing the allocation parameters of OFDM symbols for NCT channels. By modifying which specific OFDM symbols are designated for synchronous and broadcasting channels, the system achieves conflict-free operation and improved efficiency. The parameter changes are structured to maintain manageable configuration complexity through standardized mapping rules.
Data Source
AI summary
A method for multiplexing synchronous signals on specific OFDM symbols to form P-SCH and the S-SCH channels is provided. The present application further discloses a method for transmitting P-BCH.