Quasi-Synchronous Cellular Broadcast via Root Node Timing Control
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Solution Overview
Problem
In 3GPP wireless communication systems, achieving high bandwidth for multimedia broadcast services is hindered by interference from neighboring cells, requiring improved mechanisms to synchronize data packets across base stations for quasi-synchronous transmission and reduce signal-to-noise ratio degradation.
Innovation Solution
A root node in the wireless communication infrastructure buffers data packets and determines time delays for transmission to each base station, ensuring that data packets are synchronized by initiating transmission based on a maximum time delay and timing latency, allowing for quasi-synchronous broadcast transmissions across multiple base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If base stations in neighboring cells use non-overlapping physical resources for broadcast transmission, then interference between cells is reduced, but spectral efficiency and broadcast service capacity are limited
Solution Approach 1:
The patent merges broadcast transmissions from multiple neighboring cells by allocating the same physical resources (time slots and frequency bands) to broadcast channels in adjacent cells. This combining approach transforms what would traditionally be interfering signals into constructive contributions, thereby improving spectral efficiency and broadcast service capacity while maintaining acceptable interference levels through power control and scheduling mechanisms
2Productivity
If the same physical resources are allocated for broadcast transmission in neighboring cells, then spectral efficiency and broadcast capacity are improved, but interference and signal-to-noise ratio degradation occur
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission power levels, timing offsets, and resource allocation parameters for broadcast transmissions in neighboring cells. These parameter modifications enable the system to achieve high spectral efficiency through resource reuse while controlling interference and maintaining signal-to-noise ratio through optimized transmission conditions
3Productivity
If data packets are transmitted simultaneously from multiple base stations, then cell throughput and broadcast effectiveness are enhanced, but synchronization complexity and timing alignment requirements increase
Solution Approach 1:
The patent implements feedback mechanisms where base stations exchange timing and synchronization information through signaling protocols. This feedback enables dynamic timing alignment and quasi-synchronous transmission, allowing multiple base stations to transmit data packets simultaneously on the same resources while maintaining coordination and managing synchronization complexity through continuous information exchange
Data Source
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AI summary
Aspects of the invention include a root node of a wireless communication infrastructure that buffers data packets for transmission by base stations over an air interface. The root node determines a time delay for transmission of a data packet from the root node to each base station, a maximum time delay of those time delays, and a timing latency based upon the maximum time delay. The root node transmits the timing latency to the base stations. In response, each base station initiates transmission of data packets received by the root node after expiration of the timing latency. Alternatively, the root node, instead of the base stations, may buffer the data packets, and transmit them so that they arrive at the base stations at substantially the same time.