Simplified Network Solution

Carrier bearer networks are meeting big challenges with the continuous emergence of new services, such as 4K, LTE/LTE-A, 5G, the Internet of Things, big data, and cloud computing. These services pose higher network requirements, including large bandwidth, low latency, fast service provisioning, and low construction and maintenance costs. Network simplification has become the development trend for bearer networks, because it satisfies bandwidth and latency requirements of various new services, shortens time to market, and reduces construction and maintenance costs per bit.

In the era of voice/web services, traffic on metro networks is small and bearer networks are mainly adopting ring topology in which services are converged layer by layer and forwarded hop by hop. However, in the era of ultra high definition videos, networks need to support real-time high-quality transmission with large bandwidth, low latency, and low jitter, and the network convergence ratio is decreasing from 16:1 in the web era to 2:1. Therefore, traditional bearer modes with high convergence ratios and bandwidth sharing on ring networks cannot satisfy the requirements of ultra-high definition videos.

To address this issue, Huawei provides a simplified network solution. In this solution, OTN equipment is introduced to simplify network architecture from ring topology to tree topology, reducing network layers and achieving one-hop access to IP nodes without intermediate convergence or forwarding. Therefore, this solution provides large bandwidth, low latency, and zero packet loss benefits.

  • Large Bandwidth Provides Sufficient Pipe Resources for Services

  • "Large capacity" is the main characteristic of WDM/OTN networks. Unlike other bearing technologies, the WDM technology adopted on WDM/OTN networks supports 80 wavelength channels in one pair of fibers and bandwidth of 100G/200G on a single channel. One pair of fibers on WDM/OTN networks can provide super bandwidth of 8 or 16 Tbit/s, which is sufficient for various services.

    Based on OTN technology, service mapping and encapsulation are performed on WDM networks at standard ODUk granularities, decoupling the service side and the transport side and achieving flexible application of large bandwidth (that is, multiple small-granularity services can be carried on a 100G or even 200G channel). Moreover, OTN networks support fast establishment of E2E service channels and service provisioning.

  • Low Latency and Zero Packet Loss Achieve Optimal Video Experience

  • In addition to bandwidth, other network performance parameters, such as packet loss rate and latency, also affect video experience. WDM/OTN introduced into the simplified network provides E2E hard pipes and transparently transmits services, so that the equipment packet loss rate is reduced to zero.

    Latency is mainly caused by congestion on IP nodes, and congestion occurs because pipes are not big enough for large bandwidth. However, the E2E hard pipes provided by WDM/OTN have equivalent bandwidth at both ends, and therefore preventing congestion. In addition, WDM/OTN helps flatten bearer networks, and uses separate wavelengths to establish direct connections, which reduces E2E trails of video services and significantly reduces latency.

    Low latency and zero packet loss on a simplified network bring optimal service experience.

  • Simplified Architecture Reduces TCO

  • Statistics show that pass-through traffic over intermediate paths on metro networks is up to 60% of the total network traffic. On traditional metro networks, services need to be forwarded hop by hop, resulting in long service paths and the consumption of many transport resources on intermediate nodes. For example, when a new service needs to be added to or dropped from a site, bandwidth on the intermediate nodes is consumed. However, in the simplified network solution, OTN is used as the transport layer, and the metro Ethernet architecture is optimized to a flattened and simple network structure with three layers (Smart CO > BNG > CR), achieving one hop to the core for services and greatly reducing forwarding costs on the intermediate nodes.

    In addition, node-by-node configuration for capacity expansion on traditional IP networks increases difficulties in fault management and maintenance. However, a simplified network solution reduces network layers, and provides visualized management capability (that is, clear alarm and monitoring interfaces are available for equipment at different layers). Therefore, fault location is more conventional and accurate, management and maintenance are easier, and the OPEX is less.

Customer Value

Large Bandwidth

Ultra-high capacity of 4T/8T/16T per fiber

Improved Experience

One hop to the core, low latency, hard pipe, and zero packet loss

Low Costs

Minimum transport and maintenance costs per bit

Fast Service Provisioning

Network slicing supports fast provisioning of various services

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