CEPT
FM52(13)19
ECC
Electronic Communications Committee
Project Team FM PT 52
3rd Meeting, 24-25 April 2013
Copenhagen
Date issued:
Source:
RED Technologies, Qualcomm
Subject:
Optimisation of sharing under LSA with small cells
Group membership required to read? (Y/N): N
Summary:
This contribution provides LSA licensee deployment maps around the incumbent for macro, micro
and pico cells topologies in the 2300 – 2400 MHz band and makes proposals as in the following
section in order to optimize sharing under LSA with small cells.
Proposal:
1. Use information on expected usage scenarios, system reference, operational features and
relevant technical parameters of the mobile broadband service as in ETSI SRdoc TR103
113 when harmonizing the 2300 – 2400 MHz frequency band under the LSA framework.
2. Note and consider when harmonizing the 2300 – 2400 MHz frequency band under an
LSA regime that a small cell deployment, in complement to macro cell deployment, can
enable smaller exclusion zones around the incumbent, and so create the opportunity for
sharing in areas where macro cell deployments would not be possible due to the need to
protect the incumbent leading to a more efficient use of the 2300 - 2400 MHz band.
3. Considering that ECC Report 172 results represent conservative scenarios and that small
cells / lower transmit power, in complement to macro deployment in the band, allows more
efficient use of the spectrum by reducing the exclusion zone, it might be appropriate to
ask WG FM for further studies to update ECC Report 172 so that it could take the LSA
framework into account.
Background:
ETSI TC ERM had adopted a work item for an ETSI System Reference document TR 103 113 on
“Mobile broadband services in the 2300 MHz – 2400 MHz band under Licensed Shared Access
regime”. ETSI TC RRS has progressed the work on the SRdoc TR 103 113; a stable draft
resulting from RRS#21 (14-15 March 2013), v1.1.1_2.0.9, has been sent to WG FM on the 10th
of April 2013 and in copy to FM PT52 Chairman and is attached for information.
ETSI SRdoc TR103 113 provides an overview of mobile broadband technologies that may be
utilised in the 2300 – 2400 MHz band under a Licensed Shared Access framework. In particular,
it presents system reference information, operational features and a summary of relevant
technical parameters of the mobile broadband service to aid the necessary studies to enable
harmonised use of this frequency band in an LSA framework.
One of the usage scenarios under consideration in the report is the capacity expansion for Mobile
Network Operators and in particular it is considered a topology to be used for the network
deployment of the 2300– 2400 MHz band based on Micro-, Pico-, Femto- and other cell
Deployment.
In this scenario, the mobile network operator decides to use its assigned spectrum in of the 2300
– 2400 MHz for the deployment of low power base station sites. A mobile network operator may
choose such deployment topology to ensure it can satisfy the incumbent’s protection
requirements over a larger coverage area.
The low transmit power of small cells, as well as their typical indoor and low height outdoor
deployments have as corollary a smaller coverage area (compared to macro cell’s coverage
area) which provides a smaller geographical granularity to small cells. This allows a small cell
deployment to better fully cover an authorized geographical area under the LSA regime, and so
create the opportunity for sharing in areas where macro cell deployments would not be possible
due to the need to protect the incumbent.
In this context, RED Technologies has carried out simulations showing that the exclusion zones
are substantially reduced when using small cells near the incumbent. The simulation assumptions
as well as coverage maps are provided in Appendix 1.
Furthermore, it is clearly noted in the ETSI SRdoc TR103 113 that ECC Report 172 does not take
the LSA framework into account, and therefore, there might be need for further studies for the
usage of the 2300 – 2400 MHz frequency band for mobile broadband wireless service under LSA
regime to further optimise the efficient use of spectrum.
Appendix 1
RED Technologies performed simulations to obtain a “LSA Licensee deployment” map in the
2300-2320MHz frequency block with Telemetry system (TLM) as “Incumbent” operating in the
2300-2400MHz band.
In the case under consideration, there are 3 TLMs (Telemetry Systems) (TLM1, TLM2, TLM3)
operating in co-channel with MFCN, 3 TLMs (TLM4, TLM5, TLM6) in adjacent-channel with
MFCN and 2 TLMs (TLM7, TLM8) in alternate-channel (spurious) with MFCN.
2
The map defines allowed deployment zones based on “typical”
ERP levels for 3 different scenarios i.e. Macro (Dark Blue; ERP
≥ 60dBm), Micro (Dark Blue + Green; ERP ≥ 41dBm), Indoor
Pico (Dark Blue + Green + Yellow; ERP ≥ 24dBm).
ERPLTE ≥ 60 dBm (MACRO / OUTDOOR / 30m HAAT)
ERPLTE ≥ 41 dBm (MICRO / OUTDDOR / 6m HAAT)
ERPLTE ≥ 24 dBm (PICO / INDDOR / 3m HAAT)
NO EMISSION ALLOWED
The zones in «red» below (figures 1 and 2) are exclusion zones where no MFCN transmission
would be allowed i.e. where MFCN emissions cannot fulfill TLM interference criteria.
Figure 1: “LSA Licensee deployment” map for Macro, Micro and Pico around the incumbent
3
Figure 2: “LSA Licensee deployment” map for Macro only around the incumbent
4