Xhaul Switching Multiplexes CPRI and Packet Signals
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Solution Overview
Problem
The bandwidth-intensive nature of CPRI signals in 5G networks poses a challenge for fronthaul communications, as they require exponential increases in bandwidth, making traditional CPRI impractical, and existing switching technologies struggle to manage latency and delay variation effectively across multiple switching hops.
Innovation Solution
A layered switching architecture that employs packet and Time Division Multiplexing (TDM) to synchronize and multiplex data signals of different types, using a hub node and remote nodes with dedicated switches for each signal type, ensuring deterministic delay and low Packet Delay Variation (PDV) by using external timing references and statistical multiplexing to manage traffic loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CPRI protocol is used for fronthaul communications in 5G networks, then signal transmission quality is maintained, but bandwidth requirements become exponentially high and impractical
Solution Approach 1:
The patent changes the fundamental parameter of signal transmission by transitioning from traditional CPRI protocol to a packet-based switching architecture. This involves transforming the signal format and transmission method, allowing 5G networks to achieve required transmission quality with manageable bandwidth through efficient packet switching and statistical multiplexing
Solution Approach 2:
The patent replaces the mechanical/time-division based CPRI signaling mechanism with an electronic/packet-based switching system. By substituting the traditional synchronized time-division multiplexing approach with packet switching and statistical multiplexing, the system achieves better bandwidth efficiency while maintaining transmission reliability
2Ease of operation
If traditional switching technologies are used, then signal routing is achieved, but latency and delay variation cannot be managed effectively across multiple switching hops
Solution Approach 1:
The patent segments the switching function into dedicated hardware components including packet switches, TDM switches, and frame synchronization units. This segmentation allows each component to be optimized for its specific function, with packet switches handling routing efficiently and TDM switches managing time-critical signal transformation, thereby reducing overall latency and delay variation
Solution Approach 2:
The patent implements frame synchronization and timing recovery mechanisms that perform preliminary actions to pre-establish synchronization before actual signal switching occurs. By anticipating and preparing synchronization requirements in advance, the system minimizes delay variation introduced during switching operations across multiple hops
3Productivity
If bandwidth is increased to accommodate 5G traffic demands, then traffic capacity is improved, but network dimensioning becomes complex and costly
Solution Approach 1:
The patent creates a universal packet-based switching platform that can handle multiple types of traffic (fronthaul, backhaul, and other data signals) through a single integrated architecture. This multi-functional approach eliminates the need for separate dedicated networks for different traffic types, simplifying network dimensioning while accommodating peak traffic demands through statistical multiplexing
Solution Approach 2:
The patent implements dynamic resource allocation through statistical multiplexing, where bandwidth and switching resources are allocated based on actual traffic demands rather than static provisioning. This dynamic approach allows the network to efficiently accommodate peak traffic loads while optimizing resource utilization during average usage conditions, thereby simplifying overall network dimensioning
Data Source
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AI summary
A method (100) for switching data signals transmitted over a transport network is disclosed. The method comprises receiving a plurality of input data signals of a first signal type wherein the plurality of data signals of the first signal type comprises data signals exchanged between a first switching apparatus and a second switching apparatus (110) and aggregating the plurality of input data signals into an aggregated first data signal (120). The method also comprises receiving a second data signal of a second signal type different to the first signal type (130), and multiplexing the first data signal with the second data signal to form a combined data signal (140). The method further comprises forwarding the combined data signal to the transport network (160). Multiplexing the first data signal with the second data signal (140) comprises, for a frame of the combined data signal, allocating the first data signal to a portion of the frame reserved for the first data signal (142), and allocating the second data signal to a remaining portion of the frame (146).