I worked for a company that made such microwave links a few years back. Used high gain directional antennas, that typically had to clear all obstructions like the trees. Not pretty in a park/wilderness location. But if that's what people want.
If a femtocell is needed because of poor wireless coverage, it seems odd to privde a wireless link to that same femtocell to provide the back link. And optical and wire would probably be costly in the middle of nowhere (example, cable providers... using microwave links... $$$).
Interference between service providers is an issue for White Spaces when it comes to unlicensed services, which are not regulated. Interference with licensed services is regulated and licenced users are protected.
I know that LTE supports moving mobiles. WiFi seemes to be suited to mobiles that are not moving as the handoffs from wiFi router to WiFi router might be from one service provider to another and cannot be managed easily. Do you agree?
On older WiFi technologies (802.11g), we have multiple Access Points in a site all set up with the same identity. A user can connect to any one, but we have not tried to move from one to the other while maintaining connection. Is such movement (roaming) possible on these older WiFi technologies?
On the question about using small sized cells, I see that need very strongly in the local San Bernardino Mountains of California just south of Big Bear. The Verizon 3g and 4g signals are down in the -105dbm range at an area with several large retreat centers in the Barton Flats area. Many many "campers" come to that area each year and cannot get good 4g or 3g coverage. It sounds like several strategically placed micro or pico cells would work nicely, mounted on the existing power poles in the area. The question is: how to get Verizon to install those base stations.
What is the practical limit for MIMO on handsets? You mentioned 8X8 won't be used on handsets. Is physical size (i.e. where to place the antennae apart) the limiting factor on the size of MIMO on handsets?
Regarding radiated power, the better the link to the base station, the lower he power in the handset. Handset adjusts its TX power based on the proximity of the base station, so it is actually safer to have a base staiton nearby since the phone is radiating right into your head and the lower the phone's TX power the better. Also, having more smaller cells will help conserve battery of the handset since it lowers its TX power. And - yes - smaller base stations transmit at lower power.
Thank you Fanny. Question: If the trend is to smaller and smaller cells to serve people more closely to their location, do we expect radiated power from the nano/pico/femto cells, and from subscriber devices, to be going down as time goes on?
Unlicensed rules in the low-power and personal use space. Centralized management is important for longer range shared services. However I believe I could make a case that such management should be a private entity rather than government.
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