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. The Technical Report is structured in the following way: Clause 1 elaborates the scope of the MUROS feasibility study. Clause 2 and Clause 3 contain usual elements like References, Definitions, Symobols and Abbreviations. Clause 4 lists the defined performance and compatibility objectives for MUROS. Clause 5 depicts the common working assumptions for the performance evaluation of MUROS candidate solutions. Clause 6 to Clause 9 contain the four candidate solutions for MUROS, in particular: the candidate solution "Speech Capacity Enhancement using DARP" in Clause 6 the candidate solution "Orthogonal Sub Channels for Circuit Switched Voice Capacity Evolution" in Clause 7 the candidate solution "Adaptive symbol constellation" in Clause 8 the candidate solution "Higher Order Modulations for MUROS" in Clause 9 Clause 10 lists the proposed candidates for the new set of training sequences. Clause 11 depicts aspects related to associated control channel design for MUROS. Clause 12 provides a summary of the evaluation versus defined objectives for each of the candidate solutions. Clause 13 finally draws conclusions.

The present document is an output of the 3GPP study item "Multi-User Reusing-One-Slot" (MUROS) [11]. 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.

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