US city plans mesh Wi-Fi network

The City of Philadelphia hopes that a mesh network of wireless Wi-Fi base stations will let users roam around an entire city...

The City of Philadelphia hopes that a mesh network of wireless Wi-Fi base stations will let users roam around an entire city instead of providing limited connectivity in a handful of hotspots.

"This is an interesting project because it entails building the world's largest mesh Wi-Fi network," said John Krzywicki, president of The Management Network Group (TMNG). But the consultant warned of challenges facing the venture.

"Even though a similar mesh network is operating in Chaska, Minnesota, that doesn't mean it will work in Philadelphia," Krzywicki said. "The Chaska network is small. The one planned in Philadelphia is much larger, with all the complications of connecting hundreds of users in any given location at the same time."

Earlier this month, the City of Philadelphia announced its plans to invest in a new wireless mesh network based on the current Wi-Fi 802.11b standard. By deploying Wi-Fi antennas on street lights and other traffic control devises, city officials hope they can turn all 135 square miles of Philadelphia into the world's largest wireless internet hotspot.

By comparison, the Chaska Wi-Fi network covers around 13 square miles.

Between eight and 16 Wi-Fi antennas will be needed per square mile in Philadelphia, depending on topography and buildings in the area, the city said.  The plan is to connect these units and create a self-organising and self-healing wireless mesh network.

Once complete, the Wi-Fi network, estimated to cost between $7m (£3.9m) and $10m, would deliver broadband internet almost anywhere radio waves can travel, including neighbourhoods where high-speed internet access is currently rare.

City officials aim to complete their plan by early December and invite bids from internet service providers and equipment suppliers by February next year.

John Blau writes for IDG News Service

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