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Content for  TR 45.913  Word version:  16.0.0

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0  IntroductionWord‑p. 6

The EGPRS2-B feature has been included into GERAN Rel-7 with the legacy GMSK pulse shape. This pulse shape yields good performance and can be used without any requirements on the operator network scenario.
Initial analysis have shown that in certain network scenarios, a spectrally wider pulse shape can improve data throughput performance further.
To obtain superior data throughput performance, investigation of a wider pulse shape is needed, including the network scenarios that will benefit from a wider pulse shape. Selection of either the legacy pulse shape or the new pulse shape will be under operator control.
It is not clear to what degree the current spectral mask can be widened without causing a detrimental impact on legacy mobile stations in these networks. It is also not clear if a spectral mask relaxation is dependent on the modulation transmitted or whether it can be assumed to be applicable for all modulations. It is important to continue to improve the GERAN system performance with new features, and as such it is relevant that this topic is carefully and independently studied.
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1  ScopeWord‑p. 7

The present document is an output of the 3GPP study item "Optimized Transmit Pulse Shape for Downlink EGPRS2-B" ("WIDER") [2], the objective of which is to optimise pulse shapes based on optimization criteria to be agreed by TSG GERAN WG1, and provide an evaluation of the optimized pulse shapes in a similar manner as was used in the SAIC feasibility study TR 45.903.

2  ReferencesWord‑p. 8

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]
3GPP TDoc GP-072026: "WID Optimized Transmit Pulse Shape for Downlink EGPRS2-B".
[3]
TR 45.903: "Feasibility Study on Single Antenna Interference Cancellation (SAIC) for GSM networks".
[4]
"Candidate Pulse Shapes for WIDER": Nokia Siemens Networks & Nokia Corporation, 3GPP GERAN Teleconference #3 on WIDER.
[5]
3GPP TDoc SMG2 EDGE 2E99-017: "Reference Models for Nonlinear Amplifiers and Phase Noise for Evaluation of EDGE Radio Performance", ETSI SMG2 EDGE Workshop, Toulouse (France), 2-4 March 1999.
[6]
AHG1-080111: "A link to system interface methodology, Nokia Siemens Networks & Nokia Corporation".
[7]
TR 45.913: (V1.0.0) "Optimized transmit pulse shape for downlink Enhanced General Packet Radio Service (EGPRS2-B)".
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3  Definitions, symbols and abbreviationsWord‑p. 9

3.1  Definitions

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  Symbols

For the purposes of the present document, the following symbols apply:
μ
mean of the uncoded BER
σ
variance of the uncoded BER
C/I
Carrier to Interference Ratio
C/I1
Carrier to First (Strongest) Interferer Ratio

3.3  Abbreviations

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
ACP
Adjacent Channel Protection
AFS
Adaptive Multi-Rate Full Rate Speech
AMR
Adaptive Multi-Rate
AWGN
Average White Gaussian Noise
BCCH
Broadcast Control Channel
BER
Bit Error Rate
BQC
Bad Quality Call
BSS
Base Station Subsystem
BTS
Base Tranceiver Station
CCI
Co-channel Interference
CDF
Cumulative Distribution Function
CIR, C/I
Carrier-to-Interference Ratio
CS
Circuit Switched
DARP
Downlink Advanced Receiver Performance
DL
Downlink
DTS
DARP Test Scenario
DTX
Discontinuous Transmission
EGPRS2
EDGE General Packet Radio Service 2
EGPRS2-B
EGPRS2 Level B
FER
Frame Erasure Rate
FTP
File transfer Protocol
GMSK
Gaussian Minimum Shift Keying
LGMSK
Linearised GMSK
MCL
Minimum Coupling Loss
MS
Mobile Station
MUROS
Multi-User Reusing One Slot
PA
Power Amplifier
PDTCH
Packet Data Traffic Channel
PS
Packet Switched
RRC
Root Raised Cosine
SAIC
Single Antenna Interference Cancellation
SID
Silence Indicator Description
TCH
Traffic Channel
TRX
Transceiver
TDMA
Time Division Multiple Access
UMTS
Universal Mobile Telecommunication System
UL
Uplink
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4  ObjectivesWord‑p. 10

4.1  Performance objectives

4.1.1  Data throughput improvements

The objective is to further enhance the data throughput of EGPRS2-B on the downlink.

4.2  Compatibility objectives

4.2.1  Maintenance of voice quality

The introduction of the wide bandwidth pulse should not decrease voice quality as perceived by the user.
The criteria for minimum call quality shall be:
1st Criterion: blocked calls < 2 %
2nd Criterion: satisfied user criterion fulfilled:
  • average call FER < 1 % for at least 95 % users in case of network scenarios WIDER-2 and WIDER-3 (see section 5.3);
  • average call FER < 2 % for at least 95 % users in case of network scenarios WIDER-1 (see clause 5.3).
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4.2.2  Data throughput

The introduction of the wide bandwidth pulse shall increase overall network throughput.

4.2.3  Implementation impacts to new Mobile Stations

The introduction of the wide bandwidth pulse should change MS hardware as little as possible.

4.2.4  Implementation impacts to BSS

The introduction of the wide bandwidth pulse should change BSS hardware as little as possible.

4.2.5  Impacts to network planning

Criteria for definition of minimum call quality performance for this objective is defined in Clause 4.2.1.
The study shall take into consideration the usage of wide pulse shape at the band edge, at the edge of an operator's band allocation and in country border regions where no frequency coordination are in place.
The wide pulse is expected to fulfil the same adjacent channel protection requirements as the linearised GMSK pulse at the 400 kHz offset and higher (see Clause 5.2.3).
When EGPRS2-B is used on a frequency which is adjacent (at a 200 kHz offset) to a frequency which is uncoordinated (see above), then the linearised GMSK pulse shall be used.
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4.2.6  Compatibility with Multi-User Reusing-One-Slot (MUROS)Word‑p. 11

The feature Optimized Transmit Pulse Shape for Downlink EGPRS2-B (WIDER) and the feature Multi-User Reusing-One-Slot (MUROS) will be studied independently but that compatibility of both features will be investigated after completion of the feasibility studies and before the corresponding work items are agreed.

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