Common Channel Generation for LTE Downlink Synchronization
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Solution Overview
Problem
Current 3GPP LTE downlink systems lack a detailed method for generating common channels, which hampers efficient resource allocation and initial mobile station operation, particularly in terms of transmission diversity and synchronization.
Innovation Solution
A device and method for generating a common channel signal including primary synchronization, secondary synchronization, and primary broadcasting signals, using a common channel generator, antenna mapper, multiplexer, and scrambler to allocate and transmit these signals efficiently across multiple antennas, ensuring orthogonality and improved reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common channels are allocated without a detailed generation method, then resource allocation flexibility is maintained, but receiving performance and synchronization capability deteriorate
Solution Approach 1:
The common channel is segmented into multiple components including primary synchronization channel, secondary synchronization channel, and primary broadcasting channel. Each component is generated and allocated separately through dedicated processing blocks, allowing optimized resource allocation for each channel type while maintaining overall system reliability
Solution Approach 2:
Channel allocation and resource mapping are performed in advance through preliminary processing steps. The base station pre-allocates time and frequency resources for common channels before actual transmission, ensuring optimal receiving performance without adding complexity during real-time operation
2Productivity
If common channels are transmitted without integrated mobile station process, then system simplicity is maintained, but initial operation efficiency deteriorates
Solution Approach 1:
The initial operation process is segmented into distinct phases: synchronization channel detection, cell identification, and broadcasting channel processing. Mobile stations execute these phases sequentially, improving initial operation efficiency without requiring complex integrated processing of all channels simultaneously
3Measurement precision
If transmission diversity method is not determined for primary broadcasting channel, then system flexibility is maintained, but detection capability deteriorates
Solution Approach 1:
Multiple transmission antennas are merged to transmit the primary broadcasting channel simultaneously using transmission diversity. The base station combines signals from multiple antennas with different spatial characteristics, enhancing detection capability through signal diversity while maintaining a unified transmission framework
4Productivity
If frequency resource for primary broadcasting channel is determined from many channels, then resource allocation flexibility is maintained, but resource allocation efficiency deteriorates
Solution Approach 1:
Frequency resources for the primary broadcasting channel are pre-determined and allocated from the available spectrum. The base station reserves specific subcarriers and time slots for common channels in advance, improving resource allocation efficiency by eliminating the need for dynamic selection during transmission
Solution Approach 2:
Specific frequency resources are assigned to different channel types based on their requirements. The primary broadcasting channel receives dedicated frequency resources optimized for its bandwidth and transmission characteristics, while other channels receive resources suited to their specific needs, maximizing overall resource allocation efficiency
Data Source
AI summary
The present invention relates to a common channel generating method and device in a downlink. Receiving performance by the mobile station is improved by efficiently allocating the resource and generating the common channel in the downlink. Also, transmission diversity applied to the number of transmit antennas of the base station and the common channel can be easily detected, thereby acquiring the mobile station's initial process.