ENABLINGDEVICE-TO-DEVICE COMMUNICATIONS IN MILLIMETER-WAVE 5G CELLULAR NETWORKS

By Bayar Shahab

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OUTLINE֍ What is mmWave band?

֍ what is D2D communication?

֍ Enabling D2D communication in mmWave

֍ 5G network architecture

֍ MAC layer in mmWave 5G

֍ Resource sharing scheme

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WHAT IS MMWAVE BAND?▪ High frequency band b/w 30 GHZ-300GHZ (EHF)

▪ High data rate up to 10 Gb/s

▪ Short wavelength(Ranges about a kilometer)

▪ Narrow beamwidth(security + less interference)

▪ In door and outdoor(mesh) types

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WHAT IS MMWAVE BAND?

Mesh type mmWave can be usedas a backbone network. Thus, replacingFiber links. So, mmWave base stationsCan communicate directly without a physical Link and through high directional antennas.

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WHAT IS D2D COMMUNICATION?D2D communication is to provide connection between two

wireless devices directly or via hoppingLocal D2D communications

In local D2Dcommunication wireless devices within one small cell are communicating with each other directly without referring to the basestation and if LOS is not available via a relay in betweenthem

Global D2D communications – b/w two different base stations

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ENABLING D2D COMMUNICATION IN MMWAVE

▪ Enabling D2D communications is possible in mmWave band via high propagation loos and directional antennas▪ Interference exists between local D2D or

D2B/B2B▪ Interference can be considered using the

resource sharing scheme

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5G NETWORK ARCHITECTURE

Combination of:- 4G base stations- MmWave base stations- wireless devices

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MAC LAYER IN MMWAVE 5G

▪ TDMA with super frames

▪ CAT(channel access time)

▪ Polling ,polling response and PIFS(polling inter frame space)

▪ Intermediate node(when LOS is not available)

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MAC LAYER IN MMWAVE 5G

Multiple links arecommunicating withinone time slot

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RESOURCE SHARING SCHEME

▪ Enabled D2D communication in mmWave have interference

▪ Resource sharing can overcome the problem of interference

▪ The base station makes the decision of the resource sharing

▪ Non-orthogonal resource sharing is used(NOS)▪ Using same resources for all links

▪ Only non-interfering links are allocated to eachtime slot to share the resources. The concurrent transmission condition is that two links can operate simultaneouslywithout interference if and only if any transmitter is outsidethe beamwidth of the other receiver or does not direct itsbeam to the other receiver if it is within the beamwidth ofthe other receiver

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RESOURCE SHARING SCHEME

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REFERENCES [1] L.Greenemeier, (2015, Jun.23), Will Millimeter Waves Maximize 5GWireless?, available : http://www.scientificamerican.com/article/willmillimeter-waves-maximize-5g-wireless/[2] Engineering and Technology History Wiki, (2015, Sep.17),MillimeterWaves , Available: http://www.ethw.org/Millimeter Waves[3] Equinox telecom, (N.D), MILLI-METER WAVE /EBAND 5G WIRELESS SOLUTIONS, available:http://www.equinoxtelecom.com/technologies-milli-meter-wave.php[4] Qiao, Jian et al. ”Enabling Device-To-Device Communications InMillimeter-Wave 5G Cellular Networks”. IEEE magazine 2015: 209-215.Print