Femtocell Multicast Data Stream Segmentation
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Solution Overview
Problem
Femtocells face challenges in multicasting or broadcasting data streams effectively due to interference issues and regulatory complexities, particularly in dense urban areas with wideband technologies, and existing solutions do not efficiently utilize excess bandwidth for reliable and timely multimedia content delivery to multiple users.
Innovation Solution
A system and method that utilize multiple femtocells to multicast or broadcast data streams to cellular-enabled communication devices, synchronizing them via global navigation satellite systems, and using excess bandwidth to transmit portions of the data stream, with packet identifiers and timestamps to ensure reassembly and presentation of multimedia content, while also integrating with cellular and WiMAX base stations for enhanced coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If femtocells use licensed frequencies in dense urban areas, then coverage and capacity are improved, but interference between femtocells and macrocell networks increases
Solution Approach 1:
The patent segments the data stream into multiple portions and distributes them across different femtocells for transmission. This segmentation allows the system to utilize multiple frequency resources and spatial paths, reducing the impact of interference on any single transmission path while maintaining overall coverage and capacity.
2Productivity
If femtocells transmit data streams to multiple users, then service capacity is improved, but reliability of data delivery deteriorates due to interference and signal variability
Solution Approach 1:
The patent merges transmissions from multiple femtocells to deliver a single data stream to multiple users. By combining signals from multiple sources and using distributed transmission across several femtocells, the system achieves both high service capacity and reliable delivery through spatial diversity and redundancy.
Solution Approach 2:
The system performs preliminary actions by pre-synchronizing multiple femtocells and pre-distributing data stream portions before actual transmission. This preliminary coordination ensures that when multiple users request service, the femtocells can reliably deliver data simultaneously without conflicts, maintaining both capacity and reliability.
3Reliability
If femtocells operate independently in closed access mode, then security and access control are improved, but network utilization and resource efficiency deteriorate
Solution Approach 1:
The patent implements a universal system where femtocells can operate in both closed and open access modes, and can function as either primary or secondary transmission nodes. This multi-functionality allows the network to maintain security when needed while maximizing resource utilization by allowing any registered femtocell to participate in data stream transmission to authorized users.
4Manufacturing precision
If femtocells synchronize via GPS, then coordination and timing accuracy are improved, but system complexity and cost increase
Solution Approach 1:
The patent enables femtocells to self-synchronize by having them autonomously acquire timing information from GPS satellites and automatically adjust their transmission schedules. This self-service approach improves synchronization accuracy without requiring complex centralized control, as each femtocell independently maintains accurate timing while participating in the coordinated multicast system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable and timely presentation of multimedia content to users by synchronizing femtocells and cellular-enabled devices, efficiently utilizing excess bandwidth for multicasting, and reducing latency, thereby addressing interference and regulatory issues in femtocell deployments.
Implementation Method 1
synchronizing them via global navigation satellite systems
Data Source
AI summary
Aspects of a method and system for servicing a plurality of users via a plurality of femtocells are provided. In this regard, a cellular enabled communication device may receive portions of a datastream from a plurality of femtocells, reconstruct the datastream from the received portions of the datastream, and process the reconstructed datastream for presentation to a user of the cellular enabled communication device. The received portions may be buffered in the cellular enabled communication device. The portions of the datastream may be associated with a plurality of CDMA channel access codes. The portions of the datastream may be received via a plurality of cellular frequencies. The portions of the datastream may be received during a plurality of TDMA timeslots. Portions of the datastream may be received from a cellular base station. Portions of the datastream may be received from a WiMAX base station.