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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+ \8 F! E; Z/ W# V
Issues:) S f4 G2 V% @% u9 k- A
2.1 Interference
. f, K/ t0 A$ |2.2 Spectrum
. ^- d U4 r3 q$ B2.3 Access control ! M- R, X+ N) [; |/ [$ z% y% L
2.4 Lawful interception
, n% K- F0 ?) z9 c3 f2.5 Equipment location
5 z; J+ r% C% e9 N0 D8 G2.6 Network integration
8 c8 O3 E' h: o. t' N* h- x2.7 Emergency calls
$ S8 t- h. c( h v. @# e2 j2.8 Quality of service
# T& _7 F/ S5 Z2.9 Spectrum accuracy # @9 W5 g- {- p
2.10 Handover ' Y* ]0 q3 b. ~
還有很多問題要克服 |
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