lte co-channel situation in cable based · pdf filelte co-channel situation in cable based...

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


LTE Co-Channel situation for Cable based services


Overview about the used spectrum (licensed / unlicensed)

Available cellular and unlicensed spectrum today:

• Cellular 625 MHz ( FDD: 540; TDD: 85)

• WiFi 538,5 MHz


Co-Channel situation in the 800 MHz deployment

Source:

ANGA Association of German Cable Operators


700 MHz Bandplan for WRC 2015 (APT)

Source:

ANGA Association of German Cable Operators


700 MHz auction in Germany

Frequency Spectrum Lot size Information

700 MHz 2 x 30 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)


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


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


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


Wi-Fi Access @ Hot Spots

© Carsten Engelke


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


LTE Unlicensed services


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



• 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



• 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


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.


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.


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.


See you at ANGA COM 2015 in

Cologne

9 - 11 June 2015

www.angacom.de


International Breakfast @ ANGA COM 2015

in Cologne

Wednesday, 10 June 2015, 09.00 – 10.20 AM

www.angacom.de // www.scte.org/isbe.html

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