CEPT
ECC
Electronic Communications Committee
CPG-PTD(14)138
CPG-15 PTD
CPG-15 PTD #6
Luxembourg, 28 April – 2 May 2014
Date issued:
22 April 2014
Source:
APWPT
Subject:
Discussion of the optimal duplex gap arrangement for SAB/SAP (PMSE)
Password protection required? (Y/N)
N
Summary:
With the introduction of IMT in the 700 MHz band SAB/SAP can be seen as suffering a
substantial loss of spectrum. This document briefly discusses two of the duplex gap scenarios
identified at 3rd CPG-PTD meeting:
Figure 1: Potential channelling arrangements in the 700 MHz band agreed at CPG PTD#3.
Note: CPG-PTD(14)025 proposed to delete Sub-option 1.1 and Option 2 from this figure
There are two points to be considered with reference to SAB/SAP:
1. The overall reduction of RF spectrum.
2. The change in spectrum quality from adjacent transmitters.
2
Proposal:
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APWPT proposes that scenario 1 is selected. Considering that the documents from the
JTG 4-5-6-7 and the EC mandate clearly identify the need for maximising SAB/SAP
spectrum
The scenario 1.2 shows an introduction of SDL. If the SDL would be limited to a maximum
bandwidth of 5 MHz with defined low power restrictions and be moved to the opposite
duplex gap border, a co-existence with SAB/SAP is conceivable.
Seen from an effective and efficient SAB/SAP operation all other scenarios should not be
considered.
Use of the scenario 1 also minimises the cost to existing users of the 700MHz band.
Background:
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The JTG 4-5-6-7 document 4-5-6-7/152 presents real-live scenarios that show a
comprehensive use of SAB/SAP in the 700 MHz UHF TV band.
The JTG 4-5-6-7 doc. 4-5-6-7/230 added detailed information to the Eurovision Song
Contest spectrum use scenario and the effect if the 700 MHz spect becomes lost.
The JTG 4-5-6-7 document 4-5-6-7/228 added detailed information how the duplex gap
spectrum can be affected if LTE UE are operated in adjecent frequencies. Further
documents1 / 2 confirm this situation.
CPG-PTD(14)080 also added detailed information how the duplex gap spectrum can be
affected when LTE UE are operated in adjecent frequencies.
EC 700MHz mandate to CEPT:
This mandate aims at developing technical conditions for the introduction of wireless
broadband in the 700 MHz band by also studying the possibility of shared spectrum use
with certain incumbent uses such as PMSE.
The Chairmans Report from JTG 4-5-6-7 February meeting (Document 4-5-6-7/584-E
annex 4) states:
Taking into account the increasing demand for SAB/SAP, and the need to maintain
existing production quality, the band 470-[694] MHz will not be sufficient. Suitable
additional frequency bands, including bands already allocated to the mobile service,
below 2 GHz [ITU-R BT.SAB_SAP section x.x.x] need to be found for SAB/SAP to
compensate for this loss. Some SAB/SAP applications, which can operate under
certain interference conditions, could use IMT duplex gaps and guard bands. However,
the duplex gaps of all spectrum currently identified for IMT below 2 GHz will not fully
compensate the loss of the band [694]-790 MHz for SAB/SAP applications.
Real-live events such as the Eurovision Song Contest or the “DFB-Pokal” final (German
soccer cup) show the 700 MHz band in intensive use with up to 59 SAP/SAP audio links.
This high number cannot be condensed into a duplex gap. However, the duplex size and
spectrum quality will have a significant effect how SAB/SAP can in future be efficiently
operated in the 700 MHz band.
It is suggested that the 700 MHz duplex gap made available in the ITU regions 1 and 3.
This would support flexible and cost-effective SAB/SAP e.g. for international ENG teams.
1 LTE interference on analogue and digital PMSE devices, IRT, October 2013,
http://www.apwpt.org/downloads/irt_reportltep_mse_interference.pdf
2 LTE-PMSE coexistence measurements, JRC, November 2013,
http://ec.europa.eu/digital-agenda/en/news/pmse-stakeholders-workshop-brussels-18-february-2014