The iPhone 5 Review
by Anand Lal Shimpi, Brian Klug & Vivek Gowri on October 16, 2012 11:33 AM EST- Posted in
- Smartphones
- Apple
- Mobile
- iPhone 5
GNSS: Subtle Improvements
Section by Brian Klug
Like the iPhone 4S and the iPhone 4 CDMA before it, Apple has gone with the GNSS (Global Navigation Satellite System) leveraging both GPS and Russian GLONASS which lives entirely on the Qualcomm baseband. In the case of the iPhone 4S and 4 CDMA, that was onboard MDM6610 and MDM6600 respectively, both of which implemented Qualcomm’s gpsOneGen 8 with GLONASS tier. Going to on-baseband GNSS is really the way of the future, and partially the reason why so many of the WLAN, BT, and FM combos don’t include any GNSS themselves (those partners know it as well). In this scheme GNSS simply uses a dedicated port on the transceiver for downconversion, additional filtering (on RTR8600), and then processing on the baseband. The advantage of doing it all here is that often it eliminates the need for another dedicated antenna for GNSS, and also all of the assist and seed information traditionally needed to speed up getting a GPS fix already exists basically for free on the baseband. We’re talking about both a basic location seed, precision clock data, in addition to ephemeris. In effect with all this already existing on the baseband, every GPS start is like a hot start.
There was a considerable bump in both tracking accuracy and time to an assisted GPS fix from the iPhone 4 which used a monolithic GPS receiver to the 4 CDMA and 4S MDM66x0 solution. I made a video last time showing just how dramatic that difference is even in filtered applications like Maps.app. GLONASS isn’t used all the time, but rather when GPS SNR is either low or the accuracy of the resulting fix is poor, or during initial lock.
With MDM9615 now being the baseband inside iPhone 5, not a whole lot changes when it comes to GNSS. MDM9615 implements gpsOneGen 8A instead of just 8, and I dug around to figure out what all has changed in this version. In version 8A Qualcomm has lowered power consumption and increased LTE coexistence with GPS and GLONASS, but otherwise functionality remains the same. MDM9x25 will bring about gpsOneGen 8B with GLONASS, but there aren’t any details about what changes in that particular bump.
I spent a lot of time playing with the iPhone 5 GNSS to make sure there aren’t any issues, and although iOS doesn’t expose direct NMEA data, things look to be implemented perfectly. Getting good location data is now even more important given Apple’s first party turn by turn maps solution. Thankfully fix times are fast, and getting a good fix even indoors with just a roof between you and clear sky is still totally possible.
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Sufo - Tuesday, October 16, 2012 - link
Agreed. If his goal is to fly the flag for apple (who clearly need no flag flying - look at their stock prices, but i digress...), and discredit its detractors, he's doing an awful job. But then again, I do detect a whiff of troll.Spunjji - Friday, October 19, 2012 - link
Word.doobydoo - Saturday, October 20, 2012 - link
Bragging? About being an engineer?LOL
dagamer34 - Tuesday, October 16, 2012 - link
If you wanted a "should I upgrade to this phone" review, there are hundreds of those reviews online. But AnandTech is pretty much the only place where you get a definitive review worth reading 5 years from now. They leave no stone unturned.Arbee - Tuesday, October 16, 2012 - link
Agreed. "Should I upgrade" is covered by literally dozens of newspapers, TV shows, and websites (Engadget, The Verge, Gizmodo, All Things D just to name 4). AT is the home of the 15+ page deep dive, and they do it just as well for Androids and Windows Phones.Also, I'm completely positive that if you sent Brian a GS3 with the iPhone 5's camera he'd write about it in exactly the same way. 2 weeks ago DPReview covered the iPhone 5's camera in a very similar way (including the same suggestions on how to avoid the problem, and a demonstration of inducing similar artifacts on the iPhone 4S and a couple of Android handsets). Optics is not a soft science, there is no room for fanboyism.
rarson - Wednesday, October 17, 2012 - link
I totally disagree. He brings up a completely valid point because Anandtech usually separates the reviews from the in-depth tech examinations. There's absolutely no need for the review to be 20 pages when most people are looking for benchmarks and hands-on impressions. Considering the fact that going this in-depth made the review late, it makes no sense at all.At least half of this information in this article doesn't even fall under the category of a review.
darkcrayon - Tuesday, October 16, 2012 - link
I think this type of review (hell, the site in general) is directed at people that want the maximum amount of compiled nitty gritty techy details... Notice his review was weeks after the larger more general consumer oriented sites. I think anyone wanting to know whether they should upgrade, that isn't interested in the technical details of the A6, would be better served reading those reviews anyway.Anand has said in previous reviews that he felt that iOS was intended to be more of an "appliance" OS. It's a pretty apt comparison of the two actually. That focus is why you can side load and more easily put custom software on Android, and also why you'll need anti-malware software for it before long as well. The point of an appliance is to have a reliable, consistent device that you spend more time using than tweaking.
daar - Wednesday, October 17, 2012 - link
Point taken, darkcrayon.I prefer AT's reviews because they do a thorough and unbiased job at detailing/benchmarking and comparing different products. The suggestion was that the info about the SoC be split on it's own. If Intel released a new chip, call it i9, and the first sample was from an Alienware notebook, I would simply be suggesting that the technical info about the chip have it's own post and not be combined with the review of the notebook is all.
I find it a bit strange that people are suggesting to go to other websites when I made the comment of comparisons to other products, and quite unlike most posts in AT reviews. If I make a comment about a few ATI features not being compared with Nvidia's, I would have been surprised to have people to tell me to go visit Tom's Hardware or the like.
Not to say there wasn't any comparisons, but rather in contrast to say, for example, the One X review where Brian made the comment of how the construction of the device felt better than the GS3. It felt like punches were being pulled in this review is all.
phillyry - Sunday, October 21, 2012 - link
Anand,I would like to know, however, how an Android device serves more as an all purpose device than an iPhone.
Did you mean because of its customisable skins or because it can do some things that an iPhone cannot - presumably because of Apple's strong hold ('death grip') on the OS?
This is pretty important to me because I am near the end of the term of my agreement and am in the market for a new 'phone'. I've considered W8P for precisely this reason but am waiting to see if they flop or not. I've always thought of Android as pretty darn similar to iOS but with slightly different interfaces and less user restrictions.
Is there some other factor that makes an Android any more like a pocket computer, like the future x86 W8P phones will presumably eventually be, and less like an iPhone than I have imagined?
phillyry - Sunday, October 21, 2012 - link
I also took notice of it when Anand referred to the iPhone as an appliance. Your remark saying, "The point of an appliance is to have a reliable, consistent device that you spend more time using than tweaking" would be comforting but I don't think that that's quite how Anand meant it. I was actually quite put off by the term because I think that he meant that the iPhone is made to be more of a tag along device that goes with your other Macs and plays a support role rather than a stand alone device. He pretty much says as much.Like I said, I found this a bit off putting but I think he's just saying how he sees it in terms of the respective companies' product lines and agendas. It actually makes a fair bit of sense. I found that when I got an iPhone it made me want an iPad. And then when I got an iPad it made me want a MacBook. Call it what you will but I remember thinking that they should be able to make it so that I can do everything I need to on an iPad but distinctly felt like I really needed a MacBook to really do all that I wanted. It could be argued, along the lines of Anand's original comment, that this is Apple's approach / business model.
It also points to a distinction between Apple and the other big player that no one in this forum is talking about - Microsoft. Windows 8 appears to be meant to be the exact opposite of this approach. Instead of one device for each purpose it's one device for all purposes. It will be interesting to see if Microsoft's approach with Windows 8 will turn things around or simply flop, at least on the handheld device side of things.