C.3 Relationship to E-OTD reporting periods

05.103GPPRadio subsystem synchronizationTS

The relationship between the E-OTD reporting period , the BTS frequency source’s rms time interval error (RMS of Time Interval Error, see ITU-T Recommendation G.810), and the maximum admissible range error is given by (see 3GPP TS 05.50, annex V.7):

in which is the speed of the waves (usually taken as , the speed of light in vacuum) and is a constant which sets the percentile associated with . (When the TIE has a Gaussian distribution , , and .) In practice, the BTS frequency source stability and required E-OTD range accuracy are likely to be given and table 3 allows the corresponding value of the E-OTD reporting period to be read off.

Table 3: Relationship between frequency source stability,
E-OTD reporting period and E-OTD range errors

E-OTD Reporting Period ()

E-OTD MTIE  @ 95%

r max  @ 95%

BTS frequency source stability –

Normalised TIErms

1 second

50ns

100ns

200ns

15 meters

30 meters

60 meters

0.018 s/sec

0.036 s/sec

0.072s/sec

3 seconds

50ns

100ns

200ns

15 meters

30 meters

60 m eters

0.006 s/sec

0.012s/sec

0.024 s/sec

10 seconds

50ns

100ns

200ns

15 meters

30 meters

60 meters

0.0018 s/sec

0.0036 s/sec

0.0072 s/sec

30 seconds

50ns

100ns

200ns

15 meters

30 meters

60 meters

0.0006 s/sec

0.0012 s/sec

0.0024 s/sec

100 seconds

50ns

100ns

200ns

15 meters

30 meters

60 meters

0.00018 s/sec

0.00036 s/sec

0.00072 s/sec

300 seconds

50ns

100ns

200ns

15 meters

30 meters

60 meters

0.00006 s/sec

0.00012 s/sec

0.00024s/sec

1000 seconds

50ns

100ns

200ns

15 meters

30 meters

60 meters

0.000018 s/sec

0.000036 s/sec

0.000072 s/sec

For example given the requirement for r max  @ 95% shall be better than 60m and an observed frequency stability is 0,00072 s/sec then the resulting E-OTD Reporting Period () from the LMU making the observations will be no greater than 100 seconds.

Annex D (informative):
Change history

SPEC

SMG#

G#

CR

Phase

Version

New_Version

Subject

05.10

s25

A013

R97

6.0.0

6.1.0

Clarification of the use of TAI

05.10

s25

A014

R97

6.0.0

6.1.0

Renaming of GPRS RR states

05.10

s25

A015

R97

6.0.0

6.1.0

GPRS, Missing Timing Advance Updates on PTCCH

05.10

s26

A016

R97

6.1.0

6.2.0

Correction to timing advance for GPRS

05.10

s26

A009

R98

6.2.0

7.0.0

Pico BTS

05.10

s27

A017

R97

6.2.0

6.3.0

Packet polling procedure for calculating new TA

05.10

s28

A020

R97

6.3.0

6.4.0

GPRS MS timing requirements

05.10

s28

A021

R97

6.3.0

6.4.0

Correction of Timing Advance Procedure

05.10

s28

A023

R97

6.3.0

6.4.0

Definition of additional GPRS related reaction times

05.10

s28

A026

R97

6.3.0

6.4.0

Continuous timing advance procedure failure

05.10

s28

A018

R98

6.4.0

7.0.0

Harmonization between GSM and PCS 1900 standard

05.10

s28

A019

R98

6.4.0

7.0.0

Synchronization requirements for CTS

05.10

s28

A025

R98

6.4.0

7.0.0

Synchronization requirements for the control of the CTS service range

05.10

s29

A027

R98

7.0.0

7.1.0

Correction of CTS-FP frequency source correction slope

05.10

s29

A033

R98

7.0.0

7.1.0

Timing advance for access bursts on PTCCH/U

05.10

s29

A036

R98

7.0.0

7.1.0

Reaction time after contention resolution during one phase access

05.10

s30

A038

R99

7.1.0

8.0.0

EDGE Compact logical channels

05.10

s30

A042

R99

7.1.0

8.0.0

Definition of other reaction times

05.10

s30b

A039

R99

8.0.0

8.1.0

Extended range TA information added in 05.10

05.10

s30b

A043

R99

8.0.0

8.1.0

Synchronization of 52-multiframes in EGPRS COMPACT

05.10

s30b

A049

R99

8.0.0

8.1.0

Defining the MS carrier frequency accuracy value for GSM 400 MS

05.10

s31

A050

R99

8.1.0

8.2.0

Modifications for 8-PSK

05.10

s31

A051

R99

8.1.0

8.2.0

Timegroup definition removal from 05.10

05.10

s31b

A054

R99

8.2.0

8.3.0

EGPRS Classic to COMPACT BTS synchronization

05.10

s31b

A056

R99

8.2.0

8.3.0

BTS Synchronization, Location Accuracy and LMU update rates

05.10

s32

A058

R99

8.3.0

8.4.0

Class A Dual Transfer Mode (DTM)

September 2000 – TSG-GERAN#1

05.10

G01

A059

R99

8.4.0

8.5.0

Correction of assignment reaction time

05.10

G01

A061

R99

8.4.0

8.5.0

Addition of the switching requirement for the GSM to UTRAN

November 2000 – TSG-GERAN#2

05.10

G02

A065

R99

8.5.0

8.6.0

Corrections to synchronised handover

05.10

G02

A066

R99

8.5.0

8.6.0

Reaction time at packet assignment with polling request

8.6.0

8.6.1

Front page layout correction

January 2001 – TSG-GERAN#3

05.10

G03

A067

8.6.1

8.7.0

Delay requirements for blind handover to UTRAN

05.10

G03

A069

8.6.1

8.7.0

Timing requirements for Blind Handover 2G2G

April 2001 – TSG-GERAN#4

05.10

G04

A073

1

8.7.0

8.8.0

Updates to GSM-UTRAN Handover Interruption Times

05.10

G08

A074

1

8.8.0

8.9.0

Clarification to Requirements for Synchronization at DTM operation

05.10

G10

A075

1

8.9.0

8.10.0

Correction to inter system handover interruption times

05.10

G13

A076

8.10.0

8.11.0

Timing of DTM assignment

05.10

G13

A077

2

8.10.0

8.11.0

Correction of interruption times for GSM to UTRAN handover

05.10

G16

A081

2

8.11.0

8.12.0

Correction of definition of "ready to transmit" for inter-RAT handover