Wi-Fi Technology, Standards,and Evolution. Dr. Srikanth Subramanian CKO, Nanocell Networks
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1 Wi-Fi Technology, Standards,and Evolution Dr. Srikanth Subramanian CKO, Nanocell Networks
2 percentage Wi-Fi A Wireless Success Story Wi-Fi present in all laptops/aps Wi-Fi Traffic trends Source: Cisco Wi-Fi in Phones and tablets Wi-Fi Wired Wi-Fi's next wave presence in all CE devices (IOT) Wi-Fi Calling Significant traffic to come from noncomputing devices
3 Wi-Fi RF Bands Sensor/ smart grid Outdoor use in some countries Sub 1GHz 2.4 GHz 2.5 GHz 3.65 GHz 4.9 GHz 5.0 GHz 5.8 GHz 60 GHz Frequency (GHz) Most popular Wi-Fi band Japan specific Gradually becoming mainstream Future band Popular Bluetooth band Unlicensed band in most important markets More PAN and video centric than LAN
4 Wi-Fi Network Types Infrastructure Network Ad-hoc Networks Mesh Networks Used in homes, offices & hotspots ad-hoc Wi-Fi Direct Used in widearea/large campus deployments Used in some gaming devices Wi-Fi alliance initiative for easy to use peer-topeer connections
5 Wi-Fi Technology Evolution Part 1 (PHY) IEEE Standard (1997) b (1999) a (1999) g (2003) n (2009) ac (2013E) ad 80 MHz (160 MHz optional) 1.8 GHz Max. channel bandwidth 22 MHz 22 MHz 20 MHz 20 MHz 40 MHz Technology Max. PHY layer Data rate FHSS/D SSS DSSS (CCK) OFDM OFDM Backward compatibility is always kept in perspective 2 Mbps 11 Mbps 54 Mbps 54 Mbps MIMO + OFDM 600 Mbps MIMO (SU/MU) + OFDM Beam forming +SC/OFDM Upto 7 Gbps Up to 7 Gbps Spectrum 2.4 GHz 2.4 GHz 2.4 GHz 2.4 GHz 5 GHz 5 GHz 5 GHz 60 GHz
6 Wi-Fi Technology Evolutions Part 2 (MAC) Efficiency n QoS e Roaming r Features External networks u Management k/v Many extensions have been incorporated in main standard. Security i Support in products is not universal for all extensions.
7 Wi-Fi Deployments Carrier enabled Homes Peer to peer Offices 11n client Multiband Wi-Fi Hotspots 11b/g client 11a/b/g/n AP
8 Wi-Fi and IoT Power not a big issue in some cases Reliable connection to Internet Add Wi- Fi/Retro fit Wi-Fi Wi-Fi AP present in homes, hotspot, retail,enterprise etc. Planned Wi-Fi deployments have good coverage People comfortable with Wi-Fi New sub 1GHz solution (Wi-Fi HaLow) announced for low-power devices Cost effective solutions available
9 Wi-Fi calling - Motivation? Roaming charges on cellular leads to users using OTT apps (skype/viber over Wi-Fi) Cannot use the cellular phone number Internet AP PSTN Wi-Fi and cellular radios present enb/nb/bts Poor signal in many indoor locations Lots of voice calls made from indoor locations
10 Wi-Fi calling Use of Wi-Fi for calling /receiving using phone credentials (No apps) Operator Supported Internet Any AP which allows access OK AP enb/nb/bts Core Network PSTN Handover to cellular to be taken care
11 WiFi Aware No connection for alert Alerts about service Power efficiency kept in perspective App to get alerts Beacon like alerts If interested in service connections can be established WFA certification program based on neighbor awareness networking
12 Service Providers and Unlicensed Spectrum - approaches Wi-Fi Offload LTE-U/ LAA/MuLTEfire LTE Wi-FI Aggregation (LWA) LTE Wi-FI aggregation with IPSEC(LWIP) Not a lot of momentu m but some deploymen ts happening Lots of interest from carriers Wi-Fi camp s response to LTE-unlicensed approaches
13 GHz spectrum scene in near future 5170 MHz 5350 MHz 5470 MHz 5725 MHz 5925 MHz US 20 MHz 40 MHz 80 MHz 160 MHz Europe 20 MHz 40 MHz 80 MHz 160 MHz Old Band New Band India 20 MHz 40 MHz 80 MHz 160 MHz China 20 MHz 40 MHz 80 MHz 160 MHz 5250 MHz 5825 MHz
14 Wi-Fi Challenges and New Initiatives
15 The Real Story!! Real-life Wi-Fi traffic..difficult to aggregate in highdensity scenarios Advances of PHY. are practically useless.. We are benefitting by better radio and CPUs in products
16 Wi-Fi Sucks!! Source: Aruba Networks
17 New Standard ax Majority of deployments will evolve towards high density scenarios in the near future.. To increase the real world throughput achieved by users. To improve power efficiency for the battery powered devices. PAR aims for 4 times higher average throughput at MAC in a dense Wi-Fi environment than previous generation times likely Amendment to for operations in between 1 to 6GHz frequency bands. Focus primarily on 2.4GHz and 5GHz.
18 802.11ax Key technologies and approaches DL A-MPDU Trigger AP A-MPDU to STA4 AP A-MPDU to STA1 AP A-MPDU to STA2 AP A-MPDU to STA3 Trigger Trigger Trigger Trigger UL A-MPDU STA6 A-MPDU to AP STA4 A-MPDU to AP STA1 A-MPDU to AP STA2 A-MPDU to AP STA5 A-MPDU to AP STA3 A-MPDU to AP Multiuser Transmission; OFDMA, MU-MIMO BlkAck BlkAck BlkAck BlkAck BlkAck BlkAck BlkAck BlkAck BlkAck BlkAck RaiesdCCAmax DynamicValue Spatial reuse Dynamic threshold; plus power control..good coexistence
19 LTE and Wi-Fi together LWA and LWIP Licensed Band EPC Aggregating Wi-Fi and radio level Traffic through both LTE and Wi-Fi Both colocated and non colocated cases of enb and Wi-Fi AP considered Unlicensed Band Carrier grade AP Needs interface to communicate with LTE enb LTE R13 specifications completed 19
20 Future Trends in Wi-Fi Ripe for Innovation; Wi-Fi Aware Potential Bluetooth replacement Peer-topeer access Home and Internet access Adopt higher speed Wi-Fi 2.4 & 5 GHz Wi-Fi Displays, Set top boxes Interactions with cellular Enterprise network access Wi-Fi Calling More usage of 5 GHz Wi-Fi 60 GHz Wi-Fi usage Seamless transfer Smooth interaction with carrier LWA and LWIP
21 Govt. Initiatives in Wi-Fi How to use it?
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