2G-3G Solution- Supercanal PA2 rev A

Capacity solutions for GSM radio access networks continue to be in focus. In the Americas, non-GSM technologies, such as TDMA and AMPS, occupy a substantial amount of spectrum. Likewise, competition makes it difficult for operators to acquire new spectrum. Therefore, operators who migrate to GSM are faced with the challenge of providing enough capacity for new services while maintaining capacity in legacy systems. The downturn in the world economy has also put constraints on operators, forcing them to maximize benefits from every investment. Since high-capacity solutions are about building high-capacity networks in the most economical way, GSM radio network capacity solutions are perhaps more important today than ever before.

2003

1.1 Good sources for subscriber numbers and other statistics are, e.g., www.gsmworld.com, www.3gpp.org, www.3gpp2.org, www.emc-database.com, www.3g.co.uk, www.regtp.de ... 1.2 Today’s GSM operators add the new 3G air interfaces of UMTS to their existing GSM/GPRS infrastructure networks. Current GSM/GPRS networks already offer packet and circuit switched data transmission following the Release 99 of UMTS. The operators have to install new radio access networks, i.e., antennas, radio network controller etc. as described in chapter 4. The situation is similar for operators using cdmaOne (IS-95) technology. However, these operators go for cdma2000 as this system allows them to reuse their already existing infrastructure. Thus, based on the separation of the mobile phone systems into (very roughly) CDMA and GSM operators will lead to two different major 3G systems, cdma2000 and UMTS (and their future releases). Right now, it does not seem that there is a place for a third 3G system. Curr...

European Transactions on Telecommunications, 2010

Following the launch of the Pan-European digital mobile radio (GSM) system its salient features are summarised in this tutorial review [ 1,8]. Time Division Multiple Access (TDMA) with eight users per carrier is used at a multiuser rate of 271 kbitfs. demanding a channel equaliser to combat dispersion. The error protected chip-rate of the full-rate traffic channels is 22.8 kbit/s, while in half-rate channels is 1 1.4 kbitls. There are two speech traffic channels, five different-rate data traffic channels and 14 various control and signalling channels to support the system's operation. A moderately complex, 13 kbit/s Regular Pulse Excited speech codec with long term predictor (LTP) is used, combined with an embedded three-class error correction codec and multi-layer interleaving to provide sensitivity-matched unequal error protection for the speech bits.An overall speech delay of 57.5 ms is maintained. Slow frequency hopping at 217 hopds yields substantial performance gains for slowly moving pedestrians. R.05-Physical layer on the radio path, incorporating issues of multiplexing and multiple access, channel coding and modulation, transmission and reception, power control, frequency allocation and synchronisation aspects, etc. R.06-Speech coding specifications, such as functional, computational, and verification procedures for the speech codec and its associated voice activity detector (VAD) and other optional features. R.07-Terminal adaptor for MSs, including circuit and packet mode as well as voice-band data services. R.08-Base station (BS) and mobile switching centre (MSC) interface, and transcoder functions. R.09-Network interworking with the public telephone network (PSTN), integrated services digital network (ISDN) and packet data networks. R. 10-Service internetworking, short message service. R. 11-Equipment specification and type approval specification as regards to MSs, BSs. MSCs, home (HLR) and visited location register (VLR) as well as system simulator. 1171245, No. 2 MY.

IEEE Vehicular Technology Magazine, 2007

Traducere: Mihnea Columbeanu Editura: Miron 2 CAPITOLUL 1 ANGLIA, 1099