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.
Facebook
Twitter
RSS
276 Comments
View All Comments
Spunjji - Friday, October 19, 2012 - link
Incorrect. See HP Elitebook, Sony Vaio S15, Asus Zenbook, etc... that does depend on your definition of "trackpad that doesn't suck", but personally I'd take an Elitebook with actual buttons over the Apple effort any day, so that bit really is swings and roundabouts.doobydoo - Friday, October 19, 2012 - link
'so that bit really is swings and roundabouts'That's like saying a Ferrari is overpriced because you prefer cup holders so therefore you get more car for less when you buy a Skoda.
Also, you have to consider size, weight, battery life and performance.
You can't find a single laptop which matches the air on all of the above.
Sufo - Tuesday, October 16, 2012 - link
You're right to an extent, however it's worth mentioning that it's a lot easier to find unlocked non-apple phones at good prices on auction sites etc. It's very hard to get much less than list price on iphones, even several months after release.As for Macs, it depends entirely on which country you buy them in - in the UK for example, it is cheaper to buy a plane ticket to the States and buy a 15" w/ retina there than it is to buy one locally - the same could not be said for similarly specced PCs.
Spunjji - Friday, October 19, 2012 - link
Truth. Unfortunately Apple prices are subject to the perception that Apple products hold their value better, which in a purely practical sense really isn't any more true than for any other product. But the market does as the market does. :)Spunjji - Friday, October 19, 2012 - link
People who defend Apple's prices with fake numbers just want to whine about people who don't like Apple... see how easy that argument is to return? Please.A5 - Tuesday, October 16, 2012 - link
I'd say the smartphone market does a fairly good job of dropping prices on products that need it.The only product I can really think of that is an outstanding "value" proposition would be the $350 unlocked GNex combined with a prepaid plan. The current high-end devices (One X, GS3, iP5) all seem to be fairly priced relative to each other.
steven75 - Wednesday, October 17, 2012 - link
When I was looking at what I should price my 2.5 year old iPhone 4 at, I found the GS3 is already down to iPhone 4S prices on the resale market.Android phones just don't hold resale value vs iPhones, even the flagships, it's Mac vs PC all over again in that area. ;)
pseudonymmster - Tuesday, October 16, 2012 - link
"A processor license gives you the right to taken an ARM designed CPU core..."I think "taken" should've been "take" :D
karasaj - Tuesday, October 16, 2012 - link
Nice review guys... all I have to say :Pjjj - Tuesday, October 16, 2012 - link
On the scuffing, would you buy a car that rusts if you drive in the rain? This is clearly a design flaw, a sane company would recall the product and use a more apropriate material.You shouldn't be telling people to deal with it (except the ones that are happy to own the first colour changing phone).The size of the SoC in phones matters less and less as we go forward,more integration,more specialized cores,just because it's there it doesn't mean that much of the area is powered at the same time and the cost of silicon is less of a problem too.The limitation is power and /heat not area.
" if everyone moves to Cortex A15 based designs." - everybody ,in the high end, moves to quad Krait since A15 is likely to be just dual core for a while.
Nice review overall but,as always, your battery of benchmarks is misleading and no storage perf,really hoped for more to better understand this new core.