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In telecommunications, a femtocell—originally known as an Access Point Base Station—is a small cellular base station, typically designed for use in residential or small business environments. It connects to the service provider’s network via broadband (such as DSL or cable); current designs typically support 2 to 4 active mobile phones in a residential setting. A femtocell allows service providers to extend service coverage indoors, especially where access would otherwise be limited or unavailable. The femtocell incorporates the functionality of a typical base station but extends it to allow a simpler, self contained deployment; an example is a UMTS femtocell containing a Node B, RNC and GPRS Support Node (SGSN) with Ethernet for backhaul. Although much attention is focussed on UMTS, the concept is applicable to all standards, including GSM, CDMA2000, TD-SCDMA and WiMAX solutions. \" j! ~4 ~& s6 s9 M m6 x
Issues:
* N2 f5 {+ q: t' r) t2.1 Interference 2 J: i. U. I6 ^6 @4 {
2.2 Spectrum 3 T& r8 @" q) V3 D( L
2.3 Access control
, g) P1 e+ o7 g* W5 `' i2.4 Lawful interception ( z2 o% t' h! l: Y3 k/ M* }- J% [5 d
2.5 Equipment location
1 ^. P$ k4 w G" o2.6 Network integration
& k3 e1 \0 X8 z* i7 G: h2.7 Emergency calls
# U% t+ z# Z3 c' U' O4 E2.8 Quality of service
/ Y* j+ ]7 `1 K6 Q' v6 k4 r2.9 Spectrum accuracy 1 H" }8 `. H N) w! c/ m0 l' [
2.10 Handover
% }4 \+ W/ {; _$ t" h1 f) r還有很多問題要克服 |
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