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ANGA COM [email protected] www.angacom.de Slide 1
LTE Co-Channel Situation in
Cable based Services
Dipl. Ing. Carsten Engelke
14th Broadband Technology Conference
Friday 29th Mai 2015
Golden Tulip Gdańsk Residence,
Gdańsk, Poland
ANGA COM [email protected] www.angacom.de Slide 2
LTE Co-Channel situation for Cable based services
ANGA COM [email protected] www.angacom.de Slide 3
Overview about the used spectrum (licensed / unlicensed)
Available cellular and unlicensed spectrum today:
• Cellular 625 MHz ( FDD: 540; TDD: 85)
• WiFi 538,5 MHz
ANGA COM [email protected] www.angacom.de Slide 4
Co-Channel situation in the 800 MHz deployment
Source:
ANGA Association of German Cable Operators
ANGA COM [email protected] www.angacom.de Slide 5
700 MHz Bandplan for WRC 2015 (APT)
Source:
ANGA Association of German Cable Operators
ANGA COM [email protected] www.angacom.de Slide 6
700 MHz auction in Germany
Frequency Spectrum Lot size Information
700 MHz 2 x 30 MHz 2 x 5 MHz paired
900 MHz 2 x 35 MHz 2 x 5 MHz paired
1800 MHz 2 x 50 MHz 2 x 5 MHz paired
1,5 GHz 1 x 40 MHz 1 x 5 MHz unpaired
Note:
1452-1492 MHz: This Band was identified by CEPT for the Supplemental
Downlink (SDL) usage (unpaired)
ANGA COM [email protected] www.angacom.de Slide 7
DOCSIS 3.1 Downstream
Overlapping areas with mobile services in DVB-C/C2 and DOCSIS 3.1
Downstream
108 1794258 1218 MHz
1006
862
694
Mobile frequencies:
694 to 862 MHz (LTE 700 (WRC 15) / LTE 800)
890 to 915 MHz and 935 to 960 MHz (GSM 900)
1.710 to 1.785 MHz and 1.805 to 1.880 MHz (GSM 1800)
1.920 to 1.980 MHz and 2.110 to 2.170 MHz (UMTS 2,1)
2.500 to 2.570 MHz and 2.620 to 2.690 MHz (LTE 2,6)
1.452 to 1.492 MHz (SDL (New auction in Germany))
960
Source: ANGA Association of German Cable Operators
ANGA COM [email protected] www.angacom.de Slide 8
CEPT decision for the 700 MHz band
• Digital terrestrial television in the UHF band below 694 MHz in
particular channel 48 (686-694 MHz), shall be protected.
• For this technical conditions applicable to IMT stations user
equipment should be included in a new ITU-R Recommendation
specifying the level of -42 dBm/8 MHz for the out-of-band emission
limit in the band 470-694 MHz for IMT user equipment operating in
the band 703-733 MHz that are using a 10 MHz channel
bandwidth or less.
• Cable Operator have to take care of the quality aspects in their
networks
ANGA COM [email protected] www.angacom.de Slide 9
LTE-U vs. WiFi
LTE-U in the WiFi-Frequencies
WiFi has a very high terminal penetration
(tablets, PC’s, smart phones) and is
everywhere deployed
ANGA COM [email protected] www.angacom.de Slide 11
LTE-U a short overview
• LTE-U in the unlicensed spectrum will be used as a performance
booster in operator-deployed small cells (mobile Networks)
• Always accompanied by a licensed carrier – no focus on stand-
alone operation
• Primary carrier uses licensed spectrum (FDD or TDD)
Control signaling, mobility, user data
• Secondary carrier(s) use unlicensed spectrum
Best-effort user data (DL and potentially UL)
• LTE-U uses the signaling from the mobile network back office
ANGA COM [email protected] www.angacom.de Slide 12
LTE Unlicensed services
ANGA COM [email protected] www.angacom.de Slide 13
Wi-Fi discussion in 3GPP is focused on 5 GHz
• Licensed spectrum remains 3GPP mobile operators’ top priority to
deliver advanced services and better user experience
• Opportunistic use of unlicensed spectrum will be an important
complement to meet future traffic demand
• The new feature can be an attractive option for mobile operators
to utilize unlicensed spectrum with a unified network
• Offering potential operational cost saving, improved spectral
efficiency and better user experience
• Most of the mobile companies indicated that the first focus should
be on unlicensed operation in 5 GHz
ANGA COM [email protected] www.angacom.de Slide 14
Wi-Fi discussion in 3GPP is focused on 5 GHz
• Strong interest to start first with Licensed-Assisted Carrier
Aggregation operation leveraging on the existing LTE Carrier
Aggregation framework
• Two available options:
• (1) Cells on unlicensed spectrum used for downlink only
• (2) Cells on unlicensed spectrum used for both downlink
and uplink
• Many companies propose to start working on (1) then follow
with (2)
• Coexistence requirements
• Coexistence with WiFi
• Coexistence among cells from the same or different operators
ANGA COM [email protected] www.angacom.de Slide 15
Wi-Fi discussion in 3GPP is focused on 5 GHz
• In terms of spectrum, priority should be given to band-country
combinations in which WiFi is not currently deployed and no
special regulations apply, beginning with:
• Band 4 combined with supplementary DL LTE-U in 5.725-
5.825 GHz (note that we do not include 5.825-5.850 GHz since
this is currently used for microwave wireless backhaul)
• Band 38 combined with supplementary DL LTE-U in
5.470-5.725 GHz
• Band 38 combined with supplementary DL LTE-U in
5.150-5.350 GHz
Source: Alcatel-Lucent, Alcatel-Lucent Shanghai Bell
ANGA COM [email protected] www.angacom.de Slide 16
LTE-U impact on WiFi deployments
• WiFi performance degraded drastically in the presence of LTE
(~70% in “sparse” deployment and almost 100% in “dense”
deployment). The primary cause is that WiFi usage is often
blocked by LTE interference, making WiFi stay in “listen” mode
most of the time, which directly impacts user throughput.
• LTE-U is a simple re-band of LTE without standardized
coexistence to protect Wi-Fi, broad deployment of LTE-U will
threaten WiFi networks and future in-home services delivered over
802.11n and ac
• This has an impact to the delivered quality in WiFi networks.
Customers will be impacted with slow services or no service.
ANGA COM [email protected] www.angacom.de Slide 17
LTE-U impact on Back-Office systems
• LTE-U can have an impact on the Back Office systems in Cable
• GPRS Tunneling Protocol (GTP) tunneling is a key mechanism to
carry LTE data between EPC network elements, for example
between Serving Gateway (S-GW) and Packet Data Network
Gateway (P-GW). Implication of GTP tunneling, authentication,
subscription management, accounting, and network management
for LTE-U services may impact current MSO back office systems
• Cable Labs made investigations on this topic.
ANGA COM [email protected] www.angacom.de Slide 18
Next steps in ETSI / 3GPP to solve the problems
• LTE-U has to adopt a common politeness mechanism (such as
LBT (Listen before Talk)) that works across all regulatory domains.
• 3GPP (in RAN) has to undertake a study item that covers the
following:
• Co-existence study between LTE and WiFi taking into
• account various deployment models, as well as various WiFi
variants including 802.11ac (wave 1 and wave 2). Co-
existence studies will (1) consider random backoff principle;
(2) evaluate fairness of proposed LTE-U mechanisms.
• Co-existence study between several LTE units taking into
account various deployment models.
• Investigation of how mobile devices would handle
simultaneous WiFi and LTE-U sessions.
ANGA COM [email protected] www.angacom.de Slide 19
See you at ANGA COM 2015 in
Cologne
9 - 11 June 2015
www.angacom.de
ANGA COM [email protected] www.angacom.de Slide 20
International Breakfast @ ANGA COM 2015
in Cologne
Wednesday, 10 June 2015, 09.00 – 10.20 AM
www.angacom.de // www.scte.org/isbe.html