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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. j5 [& r5 @/ h1 L) K8 Z
Issues:
, _) V9 x5 j3 f# \5 w. ~5 `0 R2.1 Interference ; F# \3 u0 Z+ N$ ~& B) ^
2.2 Spectrum ; |' @0 r; @) {# i" e6 Y
2.3 Access control W9 u) e9 w! g; N. a
2.4 Lawful interception 2 D& w# c+ h0 ]" F1 t& R; i
2.5 Equipment location
1 ? m& }+ @& Z8 a5 f( h2.6 Network integration 4 T: j$ R) c# b7 r+ O" e
2.7 Emergency calls 1 `' k4 u9 ~, B0 b% ]% J$ G
2.8 Quality of service
5 Z k* K( y3 e' Q/ R2 C& e7 G2.9 Spectrum accuracy 7 B/ D3 U+ w. B; b: N
2.10 Handover
4 d: o" w+ V D3 S; e& u還有很多問題要克服 |
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