Chapter 1 - System Description - Nera WILINK I System Manual

Chapter 1 - System Description

1.1 Introducing WILINK I
WILINK I is a WiMAX platform for the 3 – 4 GHz licensed frequency bands. It
leverages the market-leading knowledge of Broadband Wireless Access (BWA),
industry leadership, proven field experience, and core technologies including
many years of experience with OFDM technology.
Built from the ground up based on the IEEE 802.16/ETSI HIPERMAN standards,
WILINK I is designed specifically to meet the unique requirements of the wireless
Metropolitan Area Network (MAN) environment and to deliver broadband access
services to a wide range of customers, including residential, SOHO, SME and
multi-tenant customers. Its Media Access Control (MAC) protocol was designed
for point-to-multipoint broadband wireless access applications, providing a very
efficient use of the wireless spectrum and supporting difficult user environments.
The access and bandwidth allocation mechanisms accommodate hundreds of
subscriber units per channel, with subscriber units that may support different
services to multiple end users.
The system uses OFDM radio technology, which is robust in adverse channel
conditions and enables operation in non line of sight links. This allows easy
installation and improves coverage, while maintaining a high level of spectral
efficiency. Modulation and coding can be adapted per burst, ever striving to
achieve a balance between robustness and efficiency in accordance with
prevailing link conditions.
WILINK I supports a wide range of network services, including Internet access
(via IP or PPPoE tunneling), VPNs and Voice over IP. Service recognition and
multiple classifiers that can be used for generating various service profiles enable
operators to offer differentiated SLAs with committed QoS for each service profile.
WILINK I products are currently available in the 3.3 GHz, 3.5 GHz and 3.6 GHz
frequency bands, as shown in the following tables. The actual operating
frequencies used by the system can be configured according to applicable radio
regulations, license conditions and specific deployment considerations.
2
WILINK I MODULAR BASE STATION SYSTEM MANUAL