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Technology Stocks : The *NEW* Frank Coluccio Technology Forum -- Ignore unavailable to you. Want to Upgrade?

To: Frank A. Coluccio who wrote (21118)	4/28/2007 9:15:49 AM
From: Peter Ecclesine	Read Replies (1) \| Respond to of 46821

Hi Frank, >> No single entity controls an open architecture. It is, rather, an operating environment under which multiple purveyors bound by standards and rules that are acceptable to the plurality freely exchange traffic. Like Ethernet, which is at the roots of both WiFi and WiMAX.<< Now I can see where in the WiMAX open architecture world you are coming from. A problem with unlicensed OFDM is the receiver range is about five times the transmitter range, so receivers hear other cells that cannot be reached by their transmitters. How does an open architecture deal with that fact? IEEE 802.16h is based on 802.16d, and uses GPS to synchronize all the cells, and a central database of traffic requests and a central manager for all traffic. They divide time and frequency in 5 msec blocks. If voice requires 50 samples per second, then up to four overlapping cells can provide voice traffic by centrally assigning which cell uses which 5 msec block. If there is fifth overlapping cell, then the vocoder rates of all cells have to change. IEEE 802.11y has no cell synchronization, no central database, no central traffic manager, and makes no guarantees of service. I will burn another post for some of Doug Comer's "Lessons Learned from the Internet" and let you guess which ones do not apply to wireless. petere