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Content for  TR 45.914  Word version:  18.0.0

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0  Introductionp. 11

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.
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1  Scopep. 13

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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2  Referencesp. 13

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
GP-080393: "Outcome of MUROS session", WI Rapporteur, 3GPP GERAN#37".
[3]
P.T. Brady, A model for generating on-off speech patterns in two-way conversation: Bell Systems Technical Journal (Sept. 1969), p. 2445-2472
[4]
AHG1-080064: "WI Rapporteur", GERAN.
[5]
TR 45.903: v.7.0.1, Feasibility Study on Single Antenna Interference Cancellation (SAIC) for GSM networks (Release 7)
[6]
GP-080947: "Summary of MUROS Offline Session", WI Rapporteur, 3GPP GERAN#38.
[7]
GP-081130: "MUROS Uplink Performance", Telefon AB LM Ericsson, 3GPP GERAN#39.
[8]
GP-081024: "Link to System mapping method for power imbalanced MUROS", Huawei Technologies Co., LTD., 3GPP GERAN#39.
[9]
GP-081132: "Link-2-System mapping for SAIC and non-SAIC mobiles MUROS", Telefon AB LM Ericsson, 3GPP GERAN#39.
[10]
GP-081131: "Effect of Frequency Offsets in the Link Performance of MUROS UL", Telefon AB LM Ericsson, 3GPP GERAN#39.
[11]
GP-072033, WID: "Multi-User Reusing-One-Slot (MUROS)", China Mobile, Ericsson, Nokia Siemens Networks, Nokia, Nortel Networks, NXP, Qualcomm, Telecom Italia, Vodafone, 3GPP GERAN#36.
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3  Definitions, symbols and abbreviationsp. 14

3.1  Definitionsp. 14

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Symbolsp. 14

For the purposes of the present document, the following symbols apply:
α
angle specifying constellation of α-QPSK
A
Offered Traffic
Blocking Probability
C/I
Carrier to Interference Ratio
C/I1
Carrier to First (Strongest) Interferer Ratio
IQ, I-Q
In Phase/Quadrature Phase
Χ
cross power ratio between sub channels

3.3  Abbreviationsp. 14

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
ACI
Adjacent Channel Interference
AFS
Adaptive Multi-Rate Full Slot
AHS
Adaptive Multi-Rate Half Slot
AMR
Adaptive Multi-Rate
ARFCN
Absolute Radio Frequency Carrier Number
AWGN
Average White Gaussian Noise
BCCH
Broadcast Control Channel
BER
Bit Error Rate
BSC
Base Station Controller
BSS
Base Station Subsystem
BTS
Base Tranceiver Station
CCI
Co-channel Interference
CIR, C/I
Carrier-to-Interference Ratio
DARP
Downlink Advanced Receiver Performance
DTS
DARP Test Scenario
DTx, DTX
Discontinous Transmission
EFL
Effective Frequency Load
EGPRS
EDGE General Packet Radio Service
FACCH
Fast Associated Control Channel
FER
Frame Erasure Rate
FH
Frequency Hopping
FR
Full Rate
GMSK
Gaussion Minimum Shift Keying
HR
Half Rate
HSN
Hopping Sequence Number
ICI
Inter Channel Interference
IRC
Interference Rejection Combining
ISI
Inter Symbol Interference
JD
Joint Detection
L2S
Link to System mapping
MA
Mobile Allocation
MAIO
Mobile Allocation Index Offset
MAIOA
MAIO Allocation
MAIOHSN
MAIO Hopping Sequence Number
MAIOPN
MAIO Permutation Number
MIMO
Multiple Input Multiple Output
MRC
Maximal Ratio Combining
MSRD
Mobile Station Receive Diversity
MTS
MUROS Test Scenario
MUROS
Multi-User Reusing One Slot
PA
Power Amplifier
PAR
Peak to Average Ratio
PC
Power Control
PSK
Phase Shift Keying
QAM
Quadrature Amplitude Modulation
QPSK
Quarternary Phase Shift Keying
RMS
Root Mean Square
RR
Radio Resource
RRC
Root Raised Cosine
SACCH
Slow Associated Control Channel
SAIC
Single Antenna Interference Cancellation
SCPIR
Sub Channel Power Imbalance Ratio
SIC
Successive Interference Cancellation
SNR
Signal-to-Noise Ratio
TCH/EFS
Traffic channel employing enhanced full rate GSM speech codec
TCH/FS
Traffic channel employing full rate GSM speech codec
TCH/HS
Traffic channel employing half rate GSM speech codec
TCH/AFS
Traffic channel employing AMR full rate codec
TCH/AHS
Traffic channel employing AMR half rate codec
TCH/WFS
Traffic channel employing Wideband AMR full rate codec based on GMSK
TRX
Transceiver
TSC
Training Sequence Code
VAD
Voice Activity Detection
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