Date: Monday, April 6th, 2009, 10:02
A list of wireless radio component specifications found within beta distributions of the iPhone OS 3.0 firmware offers details for a new chip enabling low power 802.11n bound for the third-generation iPod touch handset. According to AppleInsider, the chip is also likely to be en route for Apple’s upcoming iPhone models.
The version of the existing Broadcom chip that supplies WiFi and Bluetooth on existing models jumps from BCM4325 to BCM4329 in the description. The component upgrade adds new support for 802.11n features, including the ability to find and join 5GHz networks.
Current iPhone and iPod touch generations provide support for 5GHz 802.11a networks, or 2.4GHz 802.11b/g networks, pushing users who want the top speed of 802.11n (available on all MacBooks) but compatibility with 802.11b/g networks (to use the existing iPhone) to set up a 2.4GHz compatible network. That resulting push forces the wireless network to deal with interference from other networks on the often-crowded 2.4GHz band.
Apple’s latest firmware update for its AirPort base stations added support for dual-band networks, allowing both slow and fast devices to hook into 2.4Ghz and 5Ghz signals at the same time.
New support for 802.11n in the upcoming iPhone and iPod touch models would also provide the devices with additional network speed and reception range features of the significantly faster 802.11n specification as well as channel bonding (using two channels at once to double the top reception speed) and MIMO, the ability to use multiple transmit and receive antennas to improve reception speed and range.
The new device also focuses on efficient power management, with a special integrated PMU (power management unit) and a shared Bluetooth and WiFi receive signal path, which “eliminates the need for an external power splitter while maintaining excellent sensitivity for both Bluetooth and WLAN.”
The new component could dramatically speed up WiFi throughput and flexibility as AT&T and other providers also upgrade their 3G networks to take advantage of parallel improvements in mobile 3G speed capacity expected in the new iPhone.