Product/Service

Broadband Wireless Access Architecture

Source: Aperto Networks
This architecture was designed for multi-service fixed broadband wireless access
Aperto Networksecture was designed for multi-service fixed broadband wireless access. These standards-based access systems support dense cellular deployments, high network scalability, line-of-sight and non-line-of-sight operation, and end-to-end QOS management in point-to-multipoint topologies. They also feature an IP-based and multi-service design, an adaptive physical layer (radio and modem), advanced Media Access Control Layer and high cellular frequency reuse.

The access systems include:

  • ServiceQ (three distinct service classes over variable-capacity user links)
  • OptimaLink (dynamic control to optimize each subscriber connection)
  • RapidBurst (delivery of high-capacity and flexible two-way burst-mode TDMA)

ServiceQ enables Quality of Service (QoS) and bandwidth management across the wireless (air) interface, and interworks with industry-standard IP DiffServ and MPLS protocols to extend service classes through backhaul networks. Service classes are increasingly important in the delivery of wireline multi-service Service Level Agreements (SLAs), and they will be no less significant for mass-market wireless deployments. ServiceQ is used to support SLAs and enable per-flow traffic policing and traffic shaping on end-to-end networks.

OptimaLink performs dynamic control of link parameters to optimize each subscriber's connection in a multi-user, point-to-multipoint environment, guaranteeing high performance and coverage for all users. It uses ten multi-layer link parameters on a burst-by-burst basis, in order to maximize coverage and capacity while maintaining a high level of spectral efficiency. At the base station, OptimaLink's adaptive algorithm selects the best set of parameters from each of ten factors to optimize the communications channel to each subscriber.

RapidBurst provides flexible bandwidth allocation that allows control of transmission parameters, enabling both the OptimaLink and ServiceQ algorithms to function effectively. It also supports the company's Link Layer Error Recovery Scheme, which helps maintain network operation even under severely degraded conditions. A new contention state machine is incorporated to reduce collision activity in the upstream channel, and enables up to 20Mbps per user burst capacity in either the upstream or downstream direction. It also incorporates an advanced MAC algorithm to support both Time Division Duplexing (TDD) and Frequency Division Duplexing (FDD).

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