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WiN5200 Product Description | 20
protection, defenses against viruses, backdoor exploits and denial of service attacks to name a
few. Some of these elements are almost a business necessity for a wireless service provider
and may justify the cost of an additional security suite initially. For other companies, a
migration strategy to enhanced tools makes the most cost effective sense.
A good place to start is examining market and service scenarios. If your customer base is
highly sensitive to data integrity (financial sector or hospital customers) third party intrusion
prevention systems can help segment customers from each other better as well as secure them
from outside attack.
Or in another example, a mobile network that offers just Internet access and voice may wish
to abrogate responsibility for data encryption and use session initiation protocol (SIP)
signaling for its VoIP and WiMAX native authentication tools.
Referring to encryption, clearly an AES supported data encryption system gives WiMAX
excellent security in this regard. However, additional solutions that meet customer needs
such as virtual private networks may enhance the business model and provide additional
source of revenue.
2.4.3 Time Division Duplexing (TDD)
The WiN5200 CPE uses time division duplexing (TDD) to transmit and receive on the same
RF channel. This is a non-contention based method for providing an efficient and predictable
two-way PTP or PMP cell deployment. All uplink and downlink transmission scheduling is
managed by the base station. The base station sends data traffic to subscribers, polls for grant
requests, and sends grant acknowledgements based on the total of all traffic to all subscribers.
2.4.4 Coding Rate
Each burst of data transmitted over the wireless interface is padded with redundant
information, making it more resistant to potential over-the-air errors. The coding rate is the
ratio of user data to the total data transmitted including the redundant error correction data.
The base station supports coding rates of 1/2, 2/3, and 3/4.
2.4.5 Modulation
The modulation technique specifies how the data is coded within the OFDMA carriers. The
base station supports QPSK, 16 Quadarature Amplitude Modulation (QAM), and 64 QAM
modulations.