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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% J7 l& a* E7 i* M) w
Issues:
. b! M X a2 j$ R" y$ `2.1 Interference
% [. e0 C3 {) d2.2 Spectrum
4 {3 J3 m; o4 H' J5 {' J2.3 Access control 2 d4 [' x; [# X) C
2.4 Lawful interception 1 E4 A# r' w" Y% x! X# Y# M3 j% T
2.5 Equipment location
+ j% c* H6 `) G u2.6 Network integration * K0 K1 h, w2 F. N. M, g; N
2.7 Emergency calls ; X( S' T7 p! ]2 o3 x- w% k' @
2.8 Quality of service - W3 b1 p3 b1 n: I; `
2.9 Spectrum accuracy
9 _8 {6 Y& Y9 V" H# q$ D1 R2.10 Handover
6 r5 E5 X1 S0 a# S8 Y4 |- H還有很多問題要克服 |
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