GSM vs GSM Advanced-difference between GSM & GSM Advanced
This page on GSM vs GSM Advanced describes difference between GSM and GSM Advanced. The useful links to difference between various terms are provided here.
Global System for Mobile Communications(GSM) is known as first cellular system of the world. Today it has more than billion subscribers in the world. GSM has many frequency bands across the world based on different applications. The popular among are GSM-850, GSM-900, DCS-1800 and PCS-1900. Different ARFCNs are assigned to unique rf frequencies, refer GSM ARFCN vs frequency table and calculator.
In GSM the two basic system components are base station(BS) and mobile stations(MS). The link from BS to MSs is known as downlink and from MSs to BS is known as uplink. The resource allocation is done based on FTDMA access. Hence for 2-way communication between BS and MS one pair of frequency and time slot is needed. Refer GSM tutorial for more.
Concepts such as MSRD, SAIC, MUROS and VAMOS have been introduced in GSM Advanced. The other improvement has been made in EGPRS2 where in 16 modulation-coding schemes are added in the downlink and 13 are added in the uplink. This EGPRS2 is introduced in 3GPP release-7.
MSRD stands for mobile station receive diversity where in signals from two antennas have been combined.
Due to this, large amount of interference can be eliminated. This is referred as DAIC(Dual antenna interference cancellation).
This technique will help in bit rate improvement and also help in spectrum efficiency improvement.
The other technique SAIC(Single Antenna Interference Cancellation technique) was introduced in 3GPP release 6. Refer GSM SAIC for more.
MSRD is part of DARP-II requirement where as SAIC is part of DARP-I requirement.
The other concept MUROS(Multi User Re-using One Slot) is also employed in GSM Advanced which increases the
capacity of both voice as well as data services.
In this MUROS technique, orthogonal sub-channel is used where in 2 users use same single time slot and ARFCN.
Similar to MUROS, VAMOS has been introduced in 3GPP release 9. Refer VAMOS basics for more.
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