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Submission

July 2014

Hyunduk Kang et al, ETRISlide 1

LTE-U activities

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Date: 2014-07-16

Authors:

Name Company Address Phone E-mail

Hyunduk Kang ETRI 138 Gajeong-Ro, Yuseong-Gu, Daejeon, 305-700, South Korea

+82-42-860-1074 henry @etri.re.kr

Gwangzeen Ko ETRI

Myung-Sun Song ETRI

Jae-Ick Choi ETRI

doc.: IEEE 802.19-14/0047r0

Submission

Abstract

• This presentation provides brief summary on LTE-U workshop held on June 2014

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Hyunduk Kang et al, ETRISlide 2

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26 Participants worldwide

• Nokia, AT&T, CableLab, HiSilicon(Huawei), InterDigital, Qualcomm, China Unicom, Sony, TeliaSorena, TI, ALU, Samsung, Hitachi, Intel, CATT, Verizon, ZTE, Broadcom, KT, KDDI, Cisco, NTT Docomom, Blackberry, Fujitu, LG, T-Mobile

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Hyunduk Kang et al, ETRISlide 3

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Regulatory Issues

• Many companies provided an overview of the regulatory requirements for unlicensed operation in 5 GHz

• Different regional requirements emerged, in terms of power levels, channel sensing etc.

• Most of the companies prefer 3GPP to focus on the standardization of a global solution that can work across regions

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Hyunduk Kang et al, ETRISlide 4

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Possible Frequencies

• 5725~5850MHz, 5470~5725MHz and 5150-5250MHz (regional)

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Hyunduk Kang et al, ETRISlide 5

*1 Bands allocated by Canada/Korea are 5725-5825MHz. *2 China 5725-5850MHz is shared license among operators, open for WAS and RLAN *3 36dBm and outdoor is only permitted in US

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Deployment model & modes of operation

• Indoor and Outdoor

• CA / DC / standalone– 1st priority: LAA CA with both SDL and TDD

– 2nd priority: LAA DC

– 3rd priority: Standalone (might be the next work item)

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Hyunduk Kang et al, ETRISlide 6

Deployment model Mode of operation

Co-located cells

Licensed-AssistedCarrier Aggregation

Non co-located cells w/ ideal backhaul

Non co-located cells w/out ideal backhaul Dual Connectivity

Standalone cells Standalone

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LAA (Licensed-Assisted Access)

• LAA on unlicensed band is always combined with licensed band LTE

• Licensed band: either FDD or TDD– provides reliable connection for mobility, signaling, voice and data

• LAA: either TDD or SDL (Supplement Down Link)– boosts data rates with good enough signal (opportunistic use)

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Hyunduk Kang et al, ETRISlide 7

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Coexistence

• Coexistence is a fundamental requirement for all networks and all users within unlicensed bands to be successful

• Coexistence among LTE-U and other technology networks needs to be mandatory– A global standard is required

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Hyunduk Kang et al, ETRISlide 8

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High Level Coexistence Requirements

• Fairness– In time

– In spectrum width

• A single solution must meet all regional regulatory requirements– e.g., Listen Before Talk

• Must support multiple LTE-U networks and multiple Wi-Fi networks in the same band

• Coexistence with existing services

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Hyunduk Kang et al, ETRISlide 9

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Coexistence Use Cases

• LTE-U vs. unmanaged Wi-Fi (1)

• LTE-U vs. managed Wi-Fi (2)

• LTE-U vs. LTE-U among difference operators (3)

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Suggested Solutions for Coexistence with Wi-Fi

• LBT and fairness algorithm• Good neighbor policy - do not make legacy systems unusable• LBT and high level coexistence• Carrier selection, TDD fake + LBT• Fairness metric• Protocol/Architecture level + LBT• DFS + LBT• LBT like method, virtual carrier sensing• LBT (CSMA/CA, CCA)• Channel selection mechanism• LBT based on ED, NW assistance information• LBT required / LBT not required

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Hyunduk Kang et al, ETRISlide 11

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References

• LTE-U Workshop documents (June 2014)

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