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To: Climber who wrote (42972)	10/1/1999 12:05:00 AM
From: engineer	Read Replies (5) \| Respond to of 152472

Yes, if they use microcells, there is enough bandwidth to make this possible for every household to have a connection. Also if you factor into it an ERLANGs factor, then having one line will actually service 3-4 users, since most of the time not all users will be on at one time. If you closely examine how you actually use the net, you will realize that you are not sending or recieving data continuosly, but rahter in little bursts, so one line can in fact service probably about 6-7 users quite well. Using non-real time packet information, like the net uses allows the timesharing to be even greater, since the actually over teh air lines can be shared in between packets. Today a committed voice channel cannot be shared when your not talking. this is why in the future, voice over IP will be much more effeicient that the circuit connection voice we have today. Each 1.25 Mhz can support up to 6 independent HDR channels ( assuming a 6 sectored cell site), so if each of these then can support 10-15 users by bandwidth and time sharing, then this means in a supoercell (todays 15 km radius cell site), you can have 60-80 users. If you then assume someone like Nextwave that has 30 Mhz of bandwidth reserved all of this for HDR, then you can get about 200 users per 15 km radius. As the service grows, then you can use microcells in spots whree the demand is higher, which means you put in a cell in the middle of the larger one and this allows another 200 users. suppose that you split the radius by half each time, then by adding about 8 new cells, you can get down to 3 km radius, or about 2 miles radius for 200 users. In my neigborhood, 200 users in 2 miles would saturate the number of people who have PCs. If this is not good enough, then people like COX communications can put them up via cable TV ( see saunders CDMA equipment) and distribute this down the street with super microcells wiht 1-2 block radius. One thing to note technically on AT&T. they canot use the microcell approach very well, since they cannot reuse the adjacent frequencies on cell sites like CDMA. This severly limits their ability to just add cell sites without a major system planning effort. they also cannot use the distributed attenna approach of Saunders at all in their system, so long data strings on a single coax cable may not be possible. If 3G is all about data, they had better get some new planning going on how they are to do it. EDGE is an overlay for TDMA systems, but it does not fix up the frequency reuse problem or other limitations of GSM. It does add high speed data to the system, but it has some high prices (systems wise) due to the fact that they are fitting it into a system which already had limitations.