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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; i3 \8 a4 I+ w2 A. `
Issues:
8 |* R0 ^7 O5 g2.1 Interference ( l2 X0 J3 Z! A1 }# Q& @. T
2.2 Spectrum 0 Q0 }. q* x1 ~0 S; X+ @
2.3 Access control
; w- V- [( _. b7 C, d) Z2.4 Lawful interception * T8 V& ]3 ?$ i$ T# C2 d
2.5 Equipment location
7 J6 U0 v& C0 n( p- @4 t, ^0 i2.6 Network integration ; C: t1 s: a, q+ ?, w; I* }8 P
2.7 Emergency calls * o! m, y/ `# ?" o8 s
2.8 Quality of service ( J( t7 ~% G& R8 j/ D$ _7 I
2.9 Spectrum accuracy # ^3 p+ X1 {9 [
2.10 Handover
+ @2 M& \" T% h/ R! i1 I, e- a) [/ d還有很多問題要克服 |
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