1. GPP Consortium (1999) Network Architecture TS 23.002, http://www.3gpp. org/
2. ETSI (2005) The original GSM standard (GSM 07.05, GSM 07.07, GSM 03.40, GSM 03.38), http://www.etsi.org/
3. GSM Association (2005) GSM technology overview, http://www.gsmworld. com
4. GSM technical overview (2005) http://radio-electronics.com
5. IEEE 802.11 (1999) The original 1 Mbit/s and 2 Mbit/s, 2.4 GHz RF and IR standard