Content for TR 45.913 Word version: 16.0.0

3.1 Definitions 3.2 Symbols 3.3 Abbreviations 4.1 Performance objectives 4.2 Compatibility objectives
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0 Introduction Word‑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.

1 Scope Word‑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 References Word‑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)".

3 Definitions, symbols and abbreviations Word‑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:

mean of the uncoded BER

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

Circuit Switched

DARP

Downlink Advanced Receiver Performance

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

Mobile Station

MUROS

Multi-User Reusing One Slot

Power Amplifier

PDTCH

Packet Data Traffic Channel

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

Uplink

4 Objectives Word‑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).

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.

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.