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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; g0 R- I' s8 u. n) x f3 _
Issues:7 [' d l8 ~4 r( T9 G4 W
2.1 Interference - }3 J5 ~# H3 A/ l& h& ^% F
2.2 Spectrum
2 z4 E+ o) z {' w2.3 Access control % k% x& `- U4 c
2.4 Lawful interception
& b* n- V0 Q" k9 ?7 V$ d' [; ~2.5 Equipment location
) i t: E U3 t' Q8 U. @0 C/ a2.6 Network integration
' H' V; U% w% h8 }& b* ]2.7 Emergency calls
% ~% m% R2 T3 ~) u9 Z2.8 Quality of service 4 c5 d3 W& K4 T1 f! V
2.9 Spectrum accuracy : ~6 q! h; T" F8 P' p2 f
2.10 Handover , `. ]8 e D% `# l4 \) P
還有很多問題要克服 |
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