SIST ETS 300 911 E6:2003

Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 5.8.1 Release 1996)

SUBJECT MAFA

Digitalni celični telekomunikacijski sistem (faza 2+) – Krmiljenje povezave radijskega podsistema (GSM 05.08, različica 5.8.1, izdaja 1996)

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 911 ed.6 (1998-12) - Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link control (GSM 05.08 version 5.8.1)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 911 E6:2003
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±.UPLOMHQMHSRYH]DYH
UDGLMVNHJDSRGVLVWHPD*60UD]OLþLFDL]GDMD
Digital cellular telecommunications system (Phase 2+) (GSM); Radio subsystem link
control (GSM 05.08 version 5.8.1 Release 1996)
Ta slovenski standard je istoveten z: ETS 300 911 Edition 6
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 911 E6:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 911 E6:2003

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SIST ETS 300 911 E6:2003
EUROPEAN ETS 300 911
TELECOMMUNICATION December 1998
STANDARD Sixth Edition
Source: SMG Reference: RE/SMG-020508QR6
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2+);
Radio subsystem link control
(GSM 05.08 version 5.8.1 Release 1996)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: [e-mail] - http://www.etsi.org
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1998. All rights reserved.

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ETS 300 911 (GSM 05.08 version 5.8.1 Release 1996): December 1998
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Standards Making Support Dept." at the address shown on the title page.

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ETS 300 911 (GSM 05.08 version 5.8.1 Release 1996): December 1998
Contents
Foreword .5
1 Scope .7
1.1 Normative references .7
1.2 Abbreviations .8
2 General.8
3 Handover.9
3.1 Overall process.9
3.2 MS measurement procedure .9
3.3 BSS measurement procedure .9
3.4 Strategy.9
4 RF power control.10
4.1 Overall process.10
4.2 MS implementation .10
4.3 MS power control range.10
4.4 BSS implementation .10
4.5 BSS power control range.10
4.6 Strategy.10
4.7 Timing .11
4.8 Dedicated channels used for a voice group call or voice broadcast.11
5 Radio link failure.11
5.1 Criterion .11
5.2 MS procedure .11
5.3 BSS procedure.12
6 Idle mode tasks .12
6.1 Introduction .12
6.2 Measurements for normal cell selection .13
6.3 Measurements for stored list cell selection.13
6.4 Criteria for cell selection and reselection .14
6.5 Downlink signalling failure.15
6.6 Measurements for Cell Reselection.15
6.6.1 Monitoring of received level and BCCH data .15
6.6.2 Path loss criteria and timings for cell re-selection .16
6.7 Release of TCH and SDCCH .17
6.7.1 Normal case .17
6.7.2 Call re-establishment.17
6.8 Abnormal cases and emergency calls.18
7 Network pre-requisites .18
7.1 BCCH carriers.18
7.2 Identification of surrounding BSS for handover measurements .18
8 Radio link measurements.20
8.1 Signal strength.20
8.1.1 General.20
8.1.2 Physical parameter.20
8.1.3 Statistical parameters.21
8.1.4 Range of parameter .21
8.2 Signal quality.21
8.2.1 General.21
8.2.2 Physical parameter.22

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ETS 300 911 (GSM 05.08 version 5.8.1 Release 1996): December 1998
8.2.3 Statistical parameters . 22
8.2.4 Range of parameter. 22
8.3 Aspects of discontinuous transmission (DTX) . 23
8.4 Measurement reporting . 23
8.4.1 Measurement reporting for the MS on a TCH . 23
8.4.2 Measurement reporting for the MS on a SDCCH . 25
8.4.3 Additional cell reporting requirements for multi band MS . 25
8.4.4 Common aspects for the MS on a TCH or a SDCCH . 26
8.4.5 Measurement reporting for the BSS . 26
8.4.6 Extended measurement reporting . 26
8.5 Absolute MS-BTS distance . 27
8.5.1 General . 27
8.5.2 Physical parameter . 27
9 Control parameters. 28
10 spare. 30
Annex A (informative): Definition of a basic GSM or DCS 1 800 handover and RF power control
algorithm . 31
A.1 Scope. 31
A.2 Functional requirement. 31
A.3 BSS pre-processing and threshold comparisons . 31
A.3.1 Measurement averaging process. 32
A.3.2 Threshold comparison process. 33
A.3.2.1 RF power control process. 33
A.3.2.2 Handover Process . 34
A.4 BSS decision algorithm. 35
A.4.1 Internal intracell handover according to radio criteria: (Interference problems). 35
A.4.2 Internal handover according to other criteria. 35
A.4.3 General considerations .36
A.5 Channel allocation . 36
A.6 Handover decision algorithm in the MSC . 36
Annex B (informative): Power Control Procedures. 38
B.1 Open loop control . 38
B.2 Closed loop control. 38
B.3 Quality based control. . 39
B.4 BTS power control . 39
B.5 Example. 40
Annex C (informative): Change control history . 42
History. 43

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ETS 300 911 (GSM 05.08 version 5.8.1 Release 1996): December 1998
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) of the European Telecommunications Standards Institute (ETSI).
This ETS specifies the Radio sub-system link control implemented in the Mobile Station (MS), Base
Station System (BSS) and Mobile Switching Centre (MSC) of the digital mobile cellular and personal
communication systems operating in the 900 MHz and 1 800 MHz band (GSM 900 and DCS 1 800).
The contents of this ETS is subject to continuing work within SMG and may change following formal SMG
approval. Should SMG modify the contents of this ETS, it will be resubmitted for OAP by ETSI with an
identifying change of release date and an increase in version number as follows:
Version 5.x.y
where:
5 indicates GSM Phase 2+ Release 1996;
x the second digit is incremented for all other types of changes, i.e. technical enhancements,
corrections, updates, etc.
y the third digit is incremented when editorial only changes have been incorporated in the
specification.
Transposition dates
Date of adoption of this ETS: 4 December 1998
Date of latest announcement of this ETS (doa): 31 March 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 September 1999
Date of withdrawal of any conflicting National Standard (dow): 30 September 1999

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ETS 300 911 (GSM 05.08 version 5.8.1 Release 1996): December 1998
1 Scope
This European Telecommunication Standard (ETS) specifies the Radio sub-system link control
implemented in the Mobile Station (MS), Base Station System (BSS) and Mobile Switching Centre (MSC)
of the GSM and DCS 1 800 systems.
Unless otherwise specified, references to GSM also include DCS 1 800.
1.1 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references, the
latest edition of the publication referred to applies.
[1] GSM 01.04 (ETR 350): "Digital cellular telecommunications system (Phase 2+);
Abbreviations and acronyms".
[2] GSM 03.03 (ETS 300 927): "Digital cellular telecommunications system
(Phase 2+); Numbering, addressing and identification".
[3] GSM 03.09: "Digital cellular telecommunications system (Phase 2+); Handover
procedures".
[4] GSM 03.22 (ETS 300 930): "Digital cellular telecommunications system
(Phase 2+); Functions related to Mobile Station (MS) in idle mode and group
receive mode".
[5] GSM 04.04 (ETS 300 936): "Digital cellular telecommunications system
(Phase 2+); Layer 1; General requirements".
[6] GSM 04.06 (ETS 300 938): "Digital cellular telecommunications system
(Phase 2+); Mobile Station - Base Station System (MS - BSS) interface; Data
Link (DL) layer specification".
[7] GSM 04.08 (ETS 300 940): "Digital cellular telecommunications system
(Phase 2+); Mobile radio interface layer 3 specification".
[8] GSM 05.02 (ETS 300 908): "Digital cellular telecommunications system
(Phase 2+); Multiplexing and multiple access on the radio path".
[9] GSM 05.05 (ETS 300 910): "Digital cellular telecommunications system
(Phase 2+); Radio transmission and reception".
[10] GSM 05.10 (ETS 300 912): "Digital cellular telecommunications system
(Phase 2+); Radio subsystem synchronization".
[11] GSM 06.11 (ETS 300 962): "Digital cellular telecommunications system; Full
rate speech; Substitution and muting of lost frames for full rate speech
channels".
[12] GSM 08.08: "Digital cellular telecommunications system (Phase 2+);
Mobile-services Switching Centre - Base Station System (MSC - BSS) interface,
Layer 3 specification".
[13] GSM 08.58: "Digital cellular telecommunications system (Phase 2+); Base
Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 3
specification".
[14] GSM 11.10 (ETS 300 607): "Digital cellular telecommunications system
(Phase 2+); Mobile Station (MS) conformity specification".

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[15] GSM 03.64: "Digital cellular telecommunications system (Phase 2+); General
Packet Radio Service (GPRS); Overall description of the GPRS Radio Interface;
Stage 2".
1.2 Abbreviations
Abbreviations used in this ETS are listed in GSM 01.04.
2 General
The radio sub-system link control aspects that are addressed are as follows:
- Handover;
- RF Power control;
- Radio link Failure;
- Cell selection and re-selection in Idle mode, and in Group Receive mode.
Handover is required to maintain a call in progress as a MS engaged in a point-to-point call or with access
to the uplink of a channel used for a voice group call passes from one cell coverage area to another and
may also be employed to meet network management requirements, e.g. relief of congestion.
Handover may occur during a call from one TCH or multiple TCHs (in the case of multislot configuration)
to another TCH or multiple TCHs. It may also occur from DCCH to DCCH or from DCCH to one or
multiple TCH(s), e.g. during the initial signalling period at call set-up.
The handover may be either from channel(s) on one cell to other channel(s) on a surrounding cell, or
between channels on the same cell which are carried on the same frequency band. Examples are given of
handover strategies, however, these will be determined in detail by the network operator.
For a multiband MS, specified in GSM 02.06, the handover described is also allowed between any
channels on different cells which are carried on different frequency bands, e.g. between a GSM 900/TCH
and a DCS 1 800/TCH. Handover between two co-located cells, carried on different frequency bands, is
considered as inter-cell handover irrespective of the handover procedures used.
Adaptive control of the RF transmit power from an MS and optionally from the BSS is implemented in
order to optimize the uplink and downlink performance and minimize the effects of co-channel interference
in the system.
The criteria for determining radio link failure are specified in order to ensure that calls which fail either
from loss of radio coverage or unacceptable interference are satisfactorily handled by the network. Radio
link failure may result in either re-establishment or release of the call in progress. For channels used for a
voice group call, an radio uplink failure results in the freeing up of the uplink.
Procedures for cell selection and re-selection whilst in Idle mode (i.e. not actively processing a call), are
specified in order to ensure that a mobile is camped on a cell with which it can reliably communicate on
both the radio uplink and downlink. The operations of an MS in Idle Mode are specified in GSM 03.22.
An MS listening to a voice group call or a voice broadcast use cell re-selection procedures to change cell.
This may be supported by a list of cells carrying the voice group or voice broadcast call downlink, provided
to the MS by the network. The operations of an MS in Group Receive Mode are specified in GSM 03.22.
Information signalled between the MS and BSS is summarized in tables 1 and 2. A full specification of the
Layer 1 header is given in GSM 04.04, and of the Layer 3 fields in GSM 04.08.

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ETS 300 911 (GSM 05.08 version 5.8.1 Release 1996): December 1998
3 Handover
3.1 Overall process
The overall handover process is implemented in the MS, BSS and MSC. Measurement of radio
subsystem downlink performance and signal strengths received from surrounding cells, is made in the
MS. These measurements are signalled to the BSS for assessment. The BSS measures the uplink
performance for the MS being served and also assesses the signal strength of interference on its idle
traffic channels. Initial assessment of the measurements in conjunction with defined thresholds and
handover strategy may be performed in the BSS. Assessment requiring measurement results from other
BTS or other information resident in the MSC, may be performed in the MSC.
GSM 03.09 describes the handover procedures to be used in PLMNs.
3.2 MS measurement procedure
A procedure shall be implemented in the MS by which it monitors the downlink RX signal level and quality
from its serving cell and the downlink RX signal level and BSIC of surrounding BTS. The method of
identification of surrounding BTS is described in subclause 7.2. The requirements for the MS
measurements are given in subclause 8.1.
3.3 BSS measurement procedure
A procedure shall be implemented in the BSS by which it monitors the uplink RX signal level and quality
from each MS being served by the cell. In the case of a multislot configuration the evaluation shall be
performed on a timeslot per timeslot basis. A procedure shall be implemented by which the BSS monitors
the levels of interference on its idle traffic channels.
3.4 Strategy
The handover strategy employed by the network for radio link control determines the handover decision
that will be made based on the measurement results reported by the MS/BSS and various parameters set
for each cell. Network directed handover may also occur for reasons other than radio link control, e.g. to
control traffic distribution between cells. The exact handover strategies will be determined by the network
operator, a detailed example of a basic overall algorithm appears in annex A. Possible types of handover
are as follows:
Inter-cell handover:
Intercell handover from the serving cell to a surrounding cell will normally occur either when the
handover measurements show low RXLEV and/or RXQUAL on the current serving cell and a better
RXLEV available from a surrounding cell, or when a surrounding cell allows communication with a
lower TX power level. This typically indicates that an MS is on the border of the cell area.
Intercell handover may also occur from the DCCH on the serving cell to a TCH or multislot
configuration on another cell during call establishment. This may be used as a means of providing
successful call establishment when no TCH resource is available on the current serving cell.
Inter-cell handover between cells using different frequency bands is allowed for a multi band MS.
Intra-cell handover:
Intra-cell handover from one channel/timeslot in the serving cell to another channel/timeslot in the
same cell will normally be performed if the handover measurements show a low RXQUAL, but a
high RXLEV on the serving cell. This indicates a degradation of quality caused by interference even
though the MS is situated within the serving cell. The intra-cell handover should provide a channel
with a lower level of interference. Intra-cell handover can occur either to a timeslot on a new carrier
or to a different timeslot on the same carrier. Similarly, intra-cell handover may occur between
different multislot configurations in the same cell. These multislot configurations may comprise
different number of timeslots and may partly overlap.
Intra-cell handover from one of the bands of operation to another one is allowed for a multiband
MS.
GSM 08.08 defines the causes for handover that may be signalled from BSS to MSC.

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ETS 300 911 (GSM 05.08 version 5.8.1 Release 1996): December 1998
4 RF power control
4.1 Overall process
RF power control is employed to minimize the transmit power required by MS or BSS whilst maintaining
the quality of the radio links. By minimizing the transmit power levels, interference to co-channel users is
reduced.
4.2 MS implementation
RF power control shall be implemented in the MS.
The power control level to be employed by the MS on each uplink channel, is indicated by means of the
power control information sent either in the layer 1 header of each SACCH message block (see
GSM 04.04) on the corresponding downlink channel, or in a dedicated signalling block (see GSM 04.08).
The MS shall employ the most recently commanded power control level appropriate to each channel for all
transmitted bursts on either a TCH (including handover access burst), FACCH, SACCH or SDCCH.
The MS shall confirm the power control level that it is currently employing in the SACCH L1 header on
each uplink channel. The indicated value shall be the power control level actually used by the mobile for
the last burst of the previous SACCH period.
In case of a multislot configuration, each bi-directional channel shall be power controlled individually by the
corresponding SACCH. Power control information on downlink unidirectional channels shall be neglected.
When accessing a cell on the RACH (random access) and before receiving the first power command
during a communication on a DCCH or TCH (after an IMMEDIATE ASSIGNMENT), all GSM and class 1
and class 2 DCS 1 800 MS shall use the power level defined by the MS_TXPWR_MAX_CCH parameter
broadcast on the BCCH of the cell. The class 3 DCS 1 800 MS shall use the power level defined by MS
TXPWR MAX CCH plus the value POWER OFFSET also broadcast on the BCCH of the cell.
If a power control level defined in GSM 05.05 is received but the level is not supported by the MS, the MS
shall use the supported output power which is closest to the output power indicated by the received power
control level.
4.3 MS power control range
The range over which a MS shall be capable of varying its RF output power shall be from its maximum
output down to its minimum, in steps of nominally 2 dB.
GSM 05.05 gives a detailed definition of the RF power level step size and tolerances.
4.4 BSS implementation
RF power control may optionally be implemented in the BSS.
4.5 BSS power control range
The range over which the BSS shall be capable of reducing its RF output power from its maximum level
shall be nominally 30 dB, in 15 steps of nominally 2 dB.
GSM 05.05 gives a detailed definition of the RF power level step size and tolerances.
4.6 Strategy
The RF power control strategy employed by the network determines the ordered power level that is
signalled to the MS, and the power level that is employed by the BSS.
The power level to be employed in each case will be based on the measurement results reported by the
MS/BTS and various parameters set for each cell. The exact strategies will be determined by the network
operator. A detailed example of a basic algorithm appears in annex A.

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ETS 300 911 (GSM 05.08 version 5.8.1 Release 1996): December 1998
4.7 Timing
Upon receipt of a command from an SACCH to change its power level on the corresponding uplink
channel, the MS shall change to the new level at a rate of one nominal 2 dB power control step every
60 ms (13 TDMA frames), i.e. a range change of 15 steps should take about 900 ms. The change shall
commence at the first TDMA frame belonging to the next reporting period (as specified in subclause 8.4).
The MS shall change the power one nominal 2 dB step at a time, at a rate of one step every 60 ms
following the initial change, irrespective of whether actual transmission takes place or not.
In case of channel change, except for multislot configuration change, the commanded power control level
shall be applied on each new channel immediately. The multislot configuration change message does not
command the MS to use new power control levels. For those time slots not used by the MS before the
multislot configuration change procedure, the MS shall use the power control level used on the main
channel before the multislot configuration change.
4.8 Dedicated channels used for a voice group call or voice broadc
...