E-UTRA Neighbor Cell Reception Without Gaps
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Solution Overview
Problem
In E-UTRA systems, receiving downlink transmissions from neighboring cells while fully connected to a serving cell requires significant additional circuitry without any imposed structure on the transmissions.
Innovation Solution
The E-UTRA protocol is modified to include structure and format for downlink transmissions, allowing UEs to decode transmissions from neighboring cells without gaps and with minimal implementation complexity, by limiting the synchronization channel and BCH to 1.25 MHz bandwidth and separately encoding allocations for the first D-BCH block and RACH responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If downlink transmissions from neighboring cells are received without any imposed structure, then reception capability is improved, but device complexity increases significantly due to additional circuitry requirements
Solution Approach 1:
The patent applies parameter changes by imposing specific structural constraints on downlink transmissions, including limiting bandwidth to 1.25 MHz for synchronization and broadcast channels, and restricting transmission to specific subframes. These parameter changes enable UEs to receive neighboring cell transmissions with minimal additional circuitry while maintaining full connectivity to the serving cell.
2Device complexity
If structure is imposed on downlink transmissions to reduce implementation complexity, then device complexity is reduced, but transmission flexibility is worsened
Solution Approach 1:
The patent segments downlink transmissions into distinct components with specific structures: synchronization channels, broadcast channels limited to 1.25 MHz bandwidth, and data channels. This segmentation allows UEs to selectively process only the structured portions for neighbor cell reception while maintaining full flexibility for serving cell communications, thus reducing implementation complexity without significantly sacrificing overall transmission flexibility.
Data Source
AI summary
Simplified communication between user equipment and a neighboring cell not the primary cell is achieved by restricting the transmission parameters, such as bandwidth, of the neighboring cell transmission and provision of a simplified secondary baseband processor in the user equipment.