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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 B) ~& X: B: t, w8 r
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2.1 Interference
8 d3 X. G1 e' E* O2.2 Spectrum
$ R; ?. M! C! }& L( U8 ~2.3 Access control
0 `2 d5 T3 {1 c9 S! s( l0 N2.4 Lawful interception 4 \4 O3 p' q3 S9 U R$ q' _
2.5 Equipment location
4 B0 \; r3 P( u8 }7 E& s! h3 r2.6 Network integration
" o) \7 q. y( f+ x, k2.7 Emergency calls
5 \# d" v; ^. @' ~! y1 E4 ?2.8 Quality of service
. P: `, c' M0 f% t5 ^2.9 Spectrum accuracy
1 \" ]+ |# q: g5 c; o( `. z2.10 Handover : }! ]/ \$ v$ ^# a6 B
還有很多問題要克服 |
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