WiFi & GPS

The WiFi stack gets an update with the new iPad courtesy of Broadcom's 65nm BCM4330, compared to the BCM4329 used in the previous two iPads. Both 2.4GHz and 5GHz operation are supported, although as I mentioned earlier the carrier-dependent personal hotspot is only available over 2.4GHz.

As with most smartphone/tablet designs the BCM4330 only supports a single spatial stream, for a maximum link speed of 72Mbps. Similar to the iPad 2, Apple hides the WiFi antenna behind the speaker grille at the bottom of the tablet. The cellular antennas (there are now two) are at the top of the tablet, behind the plastic RF window.

WiFi Performance Comparison
Distance from AP 3 feet 20 feet (Different Room) 50 feet (Different Room/Floor) 100 feet (Different Room)
ASUS TF Prime (2.4GHz) 26.9 Mbps 9.85 Mbps 13.5 Mbps 2.20 Mbps
Apple iPad 2 (2.4GHz) 35.1 Mbps 29.9 Mbps 26.9 Mbps 10.6 Mbps
Apple iPad 3 (2.4GHz) 35.1 Mbps 29.9 Mbps 27.9 Mbps 9.98 Mbps
Apple iPad 2 (5GHz) 36.7 Mbps 36.7 Mbps 36.7 Mbps 11.9 Mbps
Apple iPad 3 (5GHz) 36.7 Mbps 36.7 Mbps 36.7 Mbps 11.7 Mbps

With a similar WiFi stack and similar antenna placement, it's no surprise that I noticed very similar WiFi performance to the iPad 2.

The same goes for GPS performance between the new iPad and the iPad 2. Both devices were able to lock and track me driving around in a car with comparable accuracy from what I could tell.

Airplay Support with the new Apple TV

When paired with a second or third generation Apple TV, the iPad supports wireless display mirroring or content streaming to the iPad via AirPlay. In other words, if you have an Apple TV hooked up to your HDTV, you can use your HDTV as a large, mirrored, secondary display for your iPad—wirelessly. The only requirement is that you have a 2nd or 3rd generation Apple TV and that it's on the same network as your iPad. With those requirements met, enabling AirPlay mirroring is simple—just bring up the iOS task switcher, swipe left to right until you see the brightness/playback controls and tap the AirPlay icon.

Mirroring gives you exactly what you'd expect—a complete mirror of everything you see on the local iPad screen. All sounds are also sent over and come out via your TV's speakers—the local speaker remains silent.

The frame rate isn't as high on the remote display, but there's virtually no impact to the performance of the iPad itself. There's noticeable latency of course since the display output is transcoded as a video, sent over WiFi to the Apple TV, decoded and displayed on your TV via HDMI. I measured the AirPlay latency at ms, which is reasonable for browsing the web but too high for any real-time games. If you want to use the iPad to drive your HDTV for gaming you'll need to buy the optional HDMI output dongle.

While AirPlay mirroring on the iPad works at 720p, if you're playing a 1080p movie on the new iPad and you have a 3rd generation Apple TV, the video is also displayed in 1080p rather than downscaled to 720p.

Video playback is an interesting use case for AirPlay and the iPad. If you don't have mirroring enabled, you can actually start playing a movie on the iPad, have it stream to your TV via the Apple TV, and go about using your iPad as if nothing else was happening. Most apps will allow you to stream video in the background without interrupting, however some games (e.g. GTA 3, Infinity Blade 2) and some apps (e.g. iMovie) will insist on streaming their UI to your Apple TV instead.

Although iOS and the iPad don't do a great job of promoting multi-user experiences, using AirPlay to push video to a TV wirelessly is an exception. If you frequently load your iPad up with movies you can use it to keep others entertained while you either get work done or just goof around on your iPad at the same time. It's a great fit for families where people want to do two different things. If you do put a lot of movies on your iPhone/iPad, the 3rd generation Apple TV is probably a must buy for this reason alone.

Gaming Conclusion & Controller Support: An Android Advantage What's Next: 6th gen iPhone, Haswell & Windows 8
POST A COMMENT

234 Comments

View All Comments

  • BSMonitor - Thursday, March 29, 2012 - link

    Common might have been the wrong word. But for the masses of users(mostly consumer space), internet browsing is probably the most frequent task. But overall time spent on the devices, I would guess movies/videos are #1. Reply
  • mavere - Wednesday, March 28, 2012 - link

    The iPad's h.264 decoder has always been especially efficient.

    If Apple's battery life claim is 10 hours, I'd expect 11-12 hours non-streaming video playback.
    Reply
  • Openmindeo - Wednesday, March 28, 2012 - link

    In the second page it says that the ipad 1 has a memory of 256GB .

    The entire article was fine.
    Regards.
    Reply
  • Anand Lal Shimpi - Wednesday, March 28, 2012 - link

    Thanks for the correction!

    Take care,
    Anand
    Reply
  • isoJ - Wednesday, March 28, 2012 - link

    Good points about the future and a clear demand for low-power bandwidth. Isn't PS Vita already shipping with Wide-IO? Reply
  • BSMonitor - Wednesday, March 28, 2012 - link

    I only have an iphone so I have not played around with the home sharing and all that in iTunes.

    Can they communicate locally via WiFi for Movies, Music, etc(without a PC or iCloud)?? My impression is that they must be connected to iTunes or iCloud to access/transfer media content.

    i.e. I have a 64GB iPhone 4, and load it with 20 movies and GB's of music. And say a 16GB iPad. Can I transfer a movie from the iPhone to iPad with it going to the PC/Mac or iCloud first?
    Reply
  • darkcrayon - Wednesday, March 28, 2012 - link

    You can transfer movies if you have a movie player app that supports it, several apps support file transfers over wifi (for example GoodReader can copy any of its files to GoodReader running on another device). You could use GoodReader and similar apps instead of Music to play songs, though it's not as well integrated into the OS (but songs will still play and switch in the background, etc).

    You can not transfer things you've previously loaded into the Music or Videos (ie the built in "Apple apps") between two iPads though.
    Reply
  • BSMonitor - Thursday, March 29, 2012 - link

    Thanks. I figured as much. Reply
  • ltcommanderdata - Wednesday, March 28, 2012 - link

    On page 11 you say:
    "Perhaps this is why Apple forbids the application from running on a first generation iPad, with only one CPU core."

    I don't think the single CPU core is the primary reason why iPhoto isn't supported on the first gen iPad. Afterall, the same single core A4 iPhone 4 support iPhoto. What's more, the iPhone 4's A4 is clocked lower than the first gen iPad so CPU performance isn't the primary reason. RAM appears to be the main concern with iPhoto since every supported device has at least 512MB of RAM.
    Reply
  • Anand Lal Shimpi - Wednesday, March 28, 2012 - link

    Very good point, updated :)

    Take care,
    Anand
    Reply

Log in

Don't have an account? Sign up now