CATV Network DAS Backhaul via Channel Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cable television (CATV) networks lack sufficient bandwidth to support high-capacity communication links between remote antenna systems and cellular base stations, limiting their ability to handle multiple concurrent conversations and requiring significant upgrades to meet the demands of modern distributed antenna systems (DAS).
Innovation Solution
The method involves digitizing data channels in the CATV distribution network, concatenating multiple channels to create an aggregate data channel, and using technologies like Generic Framing Procedure (GFP) and virtual concatenation to increase bandwidth, enabling the transmission of 1.42 Gbps signals between the remote antenna and the cellular base station, while maintaining capacity for conventional cable TV and cable modem traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of base stations is increased to provide higher service quality and coverage, then the coverage holes are reduced and service capacity is improved, but the financial expense and infrastructure complexity increase significantly
Solution Approach 1:
The patent segments the base station functionality into two parts: the base transceiver station (BTS) remains centralized while remote antenna units (RAUs) are distributed throughout the coverage area. Each RAU is a simplified node that receives signals from the BTS and retransmits them locally, eliminating the need for multiple complex base stations while providing widespread coverage and reducing infrastructure complexity.
2Adaptability or versatility
If remote antenna systems are deployed to extend coverage into controlled areas, then coverage holes are filled and service flexibility is improved, but the bandwidth capacity of existing CATV networks becomes insufficient
Solution Approach 1:
The patent combines multiple narrowband CATV channels into a single wideband aggregate channel using channel bonding technology. Multiple 6 MHz CATV channels are multiplexed together to create a high-capacity pipe sufficient for DAS backhaul, thereby utilizing existing network infrastructure more effectively and avoiding the need for dedicated high-bandwidth connections.
Solution Approach 2:
The patent enables the CATV network to serve multiple functions simultaneously: traditional cable TV service, cable modem internet service, and new DAS backhaul communication. By implementing QoS mechanisms and channel bonding, the network can handle diverse traffic types over the same infrastructure, making the system universal and multi-functional without requiring separate dedicated networks.
3Quantity of substance
If fiber optic lines are used to connect remote antenna systems to base stations, then high-capacity communication is achieved, but the cost and complexity of terrestrial path installation increase
Solution Approach 1:
The patent uses the existing CATV hybrid fiber-coaxial network as an intermediary to transmit DAS backhaul signals. Instead of installing new dedicated fiber optic paths, the system leverages the already-deployed CATV infrastructure, using its fiber backbone and coaxial distribution network to carry high-capacity communication signals between the BTS and distributed RAUs, thereby reducing installation costs while maintaining adequate capacity.
Data Source
AI summary
A typical cable television (CATV) network can be used as a communication link between a remote antenna system and a cellular base station (BTS). To do so, capacity of the typical CATV network is expanded to add use of an additional frequency spectrum, the added frequency is then divided into frequency channels (bands) of which each channel is digitized (e.g., using QAM) to produce a certain amount data bandwidth per channel, and a certain number of those channels are concatenated together to provide an aggregate data channel for carrying traffic between the cellular BTS and the remote antenna system (e.g., a distributed antenna system (DAS)).