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Upgraded Wi-Fi network greets Democratic Party conventioneers

Narrow sector antennas, full channel use in 2.4GHz band improve capacity

By , Network World
September 04, 2012 04:39 PM ET

Network World - Charlotte, N.C., is rolling out the red carpet for the Democrats who arrive this week to formally renominate President Barack Obama as their presidential candidate. And Time Warner Cable Arena is rolling out a new, high capacity 802.11n Wi-Fi network for them.

The new wireless LAN is deliberately designed to slice up Wi-Fi coverage as narrowly as possible, keeping cells small to control the number of concurrent users and reduce their contention for the wireless medium.

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Ruckus Wireless, which won the contract for the new network over incumbent Aruba Networks and others, designed a new access point antenna, dubbed Thunderbolt, specifically for this deployment, and is already using it other stadium-like deployments. The antenna radiates in 30-degree sectors, instead of the more conventional 360-degree and 120-degree sector. The narrower radio swaths help keep media contention low and signal strength high, allowing more users to access clear channels.

Ruckus Wi-Fi access point

The arena area has about 120 Ruckus' ZoneFlex access points, both indoor and outdoor models, many of them mounted overhead in catwalks and scaffolding (see photo at right), as well as under seats, VIP suites, offices and locker rooms, and outside the arena. In the main seating bowl, the WLAN uses the outdoor ZoneFlex 7762 units.

Time Warner Cable provides the fiber ring surrounding the arena, connecting to PoE switches in wiring closets. Gigabit Ethernet copper links the switches to the Ruckus access points. All Wi-Fi traffic from the arena routes to a Ruckus ZoneDirector 5000 controller based at TWC's Herndon Data Center, along with the vendor's FlexMaster WLAN management application.

The upgrade to 11n was pushed by the arena's main tenant, the Charlotte Bobcats basketball team, which wanted to support the growing number of Wi-Fi smartphones and tablets with reliable bandwidth, and offer fans new wireless services. These mobile devices are creating new challenges for high-density Wi-Fi networks. Time Warner Cable, besides having the name rights, also supplied the arena's fiber infrastructure. The cable company worked Ruckus and the WLAN vendor's Georgia-based broadband communications integrator, Arris, to design and install the new WLAN.

The network is designed assuming that 28% of the nearly 20,000 attendees, at full capacity, would be using Wi-Fi, mainly for uploading photos or short video clips, and for sharing with friends via social media sites like Facebook and Twitter, according to Lou Lazzaro, vice president of wireless for Time Warner Cable East Region. For non-sports events, like the Democratic National Convention, the center court is covered for stages and additional seating. The only network change for the DNC was adding another handful of access points for this central sector.

The access points can balance the load, so users can be shifted to another access point as needed, says Doug Sabo, product manager for Wi-Fi with Time Warner East Region. "We don't anticipate folks will have a lot of downtime," he says. "In our initial testing, it's fared pretty well. We haven't seen that capacity max out."

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