OsmocomGMR

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h1. ETSI GMR Specificatiosn

GMR (GEO-Mobile Radio) is a communication system specified at ETSI (European Telecommunications Standardization Institute).

GMR is based heavily by GSM, which was also originally specified by ETSI.

As there are so many areas of overlap and re-use between GSM and GMR, the GMR specifications in fact only

specify the differences to the GSM system.  Many GSM documents are referenced completely, others on a paragraph/chapter

base.

h2. Revisions

GMR comes in three revisions (so far)

* GMR Release 1 (GMR-1) -- Voice telephony and SMS only

* GMR Release 2 (GmPRS) -- Packet Data services similar to GPRS

* GMR Release 3 (GMR 3G)

h2. Specification Numbering Scheme

h2. Differences to GSM

* the GBCH for broadcasting GPS ephemeris data on the CCCH downlink ARFCN was introduced

* the RACH request (Channel Request) includes GPS coordinates and the called number (in plaintext!)

* there is a new A5/2 cipher variant, specific to GMR-1

* pi/4 QPSK modulation instead of GMSK

* different bursts and TDMA multiplex / multi-frame

* different speech codecs (lower bitrate), AMBE

* new lower-bitrate TCH and SDCCH types (TCH3, TCH6, SDDCH3, SDCCH6)

* LAPDm has a k=16 window size for outstanding unacknowledged segments (due to satellite delays)

h2. Dictionary

GMR TS 01.201 gives a good overview about the terminology differences between GSM and GMR, specifically

* BSC -> GSC

* BSS -> GSS

* BTS -> GTS

* Cell -> Spot beam

* GSM -> GMR

* ME -> MES-ME

* MS -> MES-MS

* MSC -> GSS-MSC

h2. List of specifications

h3. 01-Series

* 01.004 - Abbreviations and acronyms

* 01.201 - Introduction to the GMR-1 family

* 01.202 - GMR-1 General System Description

h3. 02-Series

* 02.011 - Service accessibility (replaces GSM TS 02.11)

h3. 03-Series

* 03.001 - Network functions (replaces GSM TS 03.01)

* 03.002 - Network architecture (replaces GSM TS 03.02)

* 03.003 - Numbering, addressing and identification (replaces GSM TS 03.03)

* 03.008 - Organization of subscriber data (replaces GSM TS 03.08)

* 03.011 - Technical realization of supplementary services (replaces GSM TS 03.11)

* 03.012 - Location registration and position identification

* 03.013 - Discontinuous reception (DRX)

* 03.014 - DTMF

* 03.020 - Security related network functions

* 03.022 - MES in Idle Mode

* 03.040 - SMS-PP

* 03.041 - SMS-CB

* 03.045 - G3 Fax

* 03.050 - Transmission planning for speech service 

* 03.081 - Line identification SS

* 03.088 - Call Barring SS

* 03.090 - USSD

* 03.296 - Terminal to Terminal Calls

* 03.297 - Optimal Routing

* 03.298 - High-penetration alerting

* 03.299 - Position Reporting Services: Stage 2 Service Description

h3. 04 Series

* 04.001 - MS-BSS Interface: General Aspects

* 04.002 - PLMN reference configuration

* 04.003 - MS-BSS Channel Structures and Access Capabilities

* 04.004 - Layer 1 General requirements

* 04.005 - Data Link Layer General Aspects

* 04.006 - MS-BSS Data Link Layer specification (LAPSat)

* 04.007 - MS-BSS Layer 3 General Aspects

* 04.008 - Signalling Layer 3 General Aspects

* 04.013 - Performance Requirements

* 04.021 - Rate Adaption on the MS-BSS interface

* 04.022 - RLP for Data and Telematic Services

h3. 05 Series

* 05.001 - Physical Layer on the Radio Path

* 05.002 - Multiplexing and Multiple Access

* 05.003 - Channel Coding

* 05.004 - Modulation

* 05.005 - Radio Transmission and Reception

* 05.008 - Radio Subystem Link Control

* 05.010 - Radio System Synchronization

h3. 06 Series

* 06.001 - Speech Processing Functions

* 06.010 - Vocoder: Speehc Transcoding

* 06.011 - Vocoder: Substitution and Muting of Lost Frames

* 06.012 - Vocoder: Comfort Noise Aspects

* 06.031 - Vocoder: Distcontinuous Transmission (DTX)

* 06.032 - Vocoder: Voice Activity Detection (VAD)

h3. 07 Series

* 07.001 - General on Terminal Adaption Functions (TAF)

* 07.002 - TAF for Asynchronous Bearer Capabilities

* 07.003 - TAF for Synchronous Bearer Capabilities