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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 solutions8 \' T6 @ J7 Z3 j
Issues:
0 E6 Z& x7 @/ V4 C( l2 |2.1 Interference
' n2 y, N" j3 k. }3 d5 Q8 T2.2 Spectrum
& V) @( Q% b+ b, x4 E2.3 Access control
6 f- S0 l2 S* @# ~. J2.4 Lawful interception
0 Q5 {: [; n; _8 ~5 A% M0 W' y; \2.5 Equipment location
2 i2 S5 u1 L2 @( q2 L5 A: c, F2.6 Network integration
/ Z* p, L& b% j. T+ h1 P0 \2.7 Emergency calls
1 Q2 F' s3 N4 q& U* C$ n2.8 Quality of service $ {* Y" Z# a8 Q% }1 V8 h
2.9 Spectrum accuracy 9 u, t4 N8 n W- A+ ?7 v" c
2.10 Handover
! o6 e4 e) ]5 G7 Z還有很多問題要克服 |
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