Recently, the GSM network is seeing its greatest expansion due to the increased demand for mobile voice services in
emerging markets. Furthermore, most of these emerging markets have densely populated cities and limited radio
spectrum. Thus the increase of voice capacity in the circuit switched domain in an evolutionary manner is a key issue
for operators in these markets.
To help operators in these scenarios to alleviate the strain on their networks, new techniques are required to improve the
voice capacity on the basis of reusing existing network equipment and radio resource. These have been investigated
during the MUROS feasibility study and candidate solutions proposed in this feasibility study are based on
multiplexing two or more users onto one time slot without degrading the speech quality. These solutions are unlike the
speech codec approach to increase network capacity by increasing speech compression, e.g. multiplexing two GSM-HR
mobiles onto one time slot but rather to maintain the same speech encoding by multiplexing four GSM-HR mobiles
onto one time slot.
This TR is an output of the 3GPP study item "Multi-User Reusing-One-Slot" (MUROS).
It contains a section describing the objectives of the Circuit Switched Voice Capacity Evolution, and further sections
presenting candidate techniques, which are evaluated according to their potential related to voice capacity improvement
in GERAN. For this the design of a new set of training sequences with improved cross correlation properties to the
existing set of training sequences is foreseen and expected to be evaluated. The study will also include the investigation
of different optimised pulse shapes for MUROS for both the uplink and the downlink.