MSM8960 Cellular Connectivity

Until now, to get 4G LTE connectivity in a smartphone has required using two basebands - one for delivering 4G LTE connectivity, and a more traditional smartphone-geared baseband for voice on 2G and 3G data. Take Verizon’s 4G LTE smartphone lineup for example, where many devices combine MSM8655 for camping a 1x voice session alongside MDM9600 for EVDO and LTE, or some other similar combination. Further, all those LTE basebands are built on 45nm process and really geared towards data specific applications.

For a while now we’ve also been talking about 28nm LTE basebands, and specifically the multimode connectivity on MSM8960. This is the first of Qualcomm’s S4 SoCs, and includes 4G LTE connectivity alongside the usual assortment of WCDMA/GSM/CDMA2000 standards. MSM8960’s cellular baseband is based around Qualcomm’s second generation (3GPP Rel.9) LTE modem, which is exactly what’s inside MDM9x15 which we’ve talked about in the past.

The full laundry list of what air interfaces MDM8960 supports is impressive - LTE FDD/TDD, UMTS, CDMA, TD-SCDMA (for Chinese markets), and GERAN (GSM/EDGE). I’ve made a small table below which gives the full laundry list.

Snapdragon S4 - MSM8960 Cellular Support
LTE FDD 100 Mbps DL / 50 Mbps UL (Cat. 3, 3GPP Rel.9)
LTE TDD 68 Mbps DL / 17 Mbps UL (Cat. 3, 3GPP Rel.9)
UMTS DC-HSPA+ 42 Mbps DL (Cat. 24) / 11 Mbps UL (Cat. 8)
CDMA2000 1xAdvanced, EVDO Rev.B (14.7 Mbps DL / 5.4 Mbps UL)
GSM GSM/GPRS/EDGE
TD-SCDMA TD-SCDMA 4.2 Mbps DL / 2.2 Mbps UL

What’s new again is inclusion of a category 3, 4G LTE baseband into the SoC alongside DC-HSPA+ and TD-SCDMA for the Chinese market. This is a substantial increase in the number of air interfaces supported onboard the SoC which will enable tighter integration and lower power from the baseband being manufactured on that same 28nm process. There’s still the requirement for external RF and transceiver (using RTR8600 or something similar) which houses all the analog, but that’s the same everywhere else.

Since the baseband in MSM8960 is shared with MDM9x15, the two are both 3GPP Release 9 devices, whereas presently MDM9600 and other launch LTE devices are 3GPP Release 8, which was the launch standard. This newer 3GPP release brings a number of improvements, and closer to transitioning to Voice over LTE (VoLTE) and SRVCC (single radio voice call continuity) for fallback to GSM/UMTS or 1x voice in the circumstance that 4G LTE coverage fades. The present combination of a camped 1x voice session alongside 4G LTE for data is also possible in MDM8960, which is exactly what’s done in the case of the HTC Thunderbolt.

In time, carriers will transition to using VoLTE and enrich the voice experience by offering services that work across the data session, alongside some circuit switched (CS) traditional 2G/3G voice to fall back to. For CDMA networks that’ll continue being the dual RF scenario which uses 1x for voice, and for UMTS networks that’ll be a SRVCC augmented fast handover to 3G for voice calls. This handover and call setup is targeted to take place in under one second.

There’s more to the connectivity situation as well, as MSM8960 includes built in WLAN 802.11b/g/n (single spatial stream), Bluetooth, and GPS. These are integrated directly into the MSM8960 the same way the cellular modem is and only require some external RF to use.

Of course, it’s one thing to talk about all this connectivity on MSM8960 and something else entirely to see it. With MSM8660, Qualcomm gave us one of their Mobile Development Platforms (MDPs) which is something of a reference design and development board for each SoC generation.

This time was no exception, and they showed off their new MSM8960 MDP connected to Verizon’s 4G LTE network streaming 1080p YouTube video, loading pages, and finally running a few speedtests using the Speedtest.net application.

This was all over Verizon’s 4G LTE network at Qualcomm HQ in San Diego and worked impressively well for hardware and software that still isn’t production level. In spite of marginal signal in the room we performed testing in, the MDP finished tests with pretty decent results. I ran some more tests on a Droid Bionic in the same room and saw similar results.

Final Words

Qualcomm has had MSM8960 silicon back in house for the past 3 months and is on-track for a release sometime in the first half of next year. Assuming Qualcomm can deliver on its claims, performance alone would be enough to sell this chip. Improved power characteristics and integrated LTE baseband really complete the package though.

The implications for a 1H 2012 MSM8960 release are tremendous. Android users will have to choose between a newer software platform (OMAP 4 running Ice Cream Sandwich) or much faster hardware (MSM8960). Windows Phone users may finally get a much needed performance boost if Microsoft chooses to standardize on Krait for its Windows Phone hardware refresh next year. End users will benefit as next year's smartphones and tablets will see, once again, a generational performance improvement over what's shipping today. LTE should also start to see much more widespread adoption (at the high end) as a result of Qualcomm's integrated LTE baseband.

The Adreno 225 GPU
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  • metafor - Friday, October 07, 2011 - link

    The SGX540 in the OMAP4460 is clocked significantly higher than (something TI is great at). So, while it isn't a powerhouse compared to Exynos or A5, it's more than sufficient. Google has never traditionally been top-of-the-line in terms of processors with their Nexus series. So it isn't out of the question they wouldn't be this time around either. Reply
  • dagamer34 - Saturday, October 08, 2011 - link

    Technically, the Hummingbird SoC used in the Nexus S was top of the line at the time it was released (although it was eclipsed by dual-coe phones after 1-2 months). Also the Nexus One was the first major phone I can remember that had 512MB of RAM.

    However, it should be said that Google doesn't think about getting the best SoCs available for their product, but instead seeks to get the best deal on it's components from bidding against vendors. It's very possible that Samsung knows they had the most powerful SoC outside of the A5 and wanted Google to pay it for the value it would provide. Google instead apparently went with TI, likely because TI is selling it's chips cheaper in order to be the reference platform for Ice Cream Sandwich.
    Reply
  • DanD85 - Friday, October 07, 2011 - link

    Funny I saw Adreno 225 having 8 SIMDS and 5 MADS per SIMDS that should be equal to 40 total MADS right? Why it's 80? Am I missing sth? Reply
  • cptcolo - Friday, October 07, 2011 - link

    Looking at the chart on "The Adreno 225 GPU" an comparing to the frame rates in the iPad 2 review (http://www.anandtech.com/show/4216/apple-ipad-2-gp... It looks like the PowerVR SGX543MP2 in the iPhone 4S will be about 33% faster. This is a very approximate estimate. Reply
  • cptcolo - Friday, October 07, 2011 - link

    "Qualcomm claims that MSM8960 will be able to outperform Apple's A5 in GLBenchmark 2.x at qHD resolutions. We'll have to wait until we have shipping devices in hand to really put that claim to the test, but if true it's good news for Krait as the A5 continues to be the high end benchmark for mobile GPU performance." Reply
  • ssvb - Friday, October 07, 2011 - link

    Please correct your CPU features comparison table (and in the previous articles too). ARM11 has a *pipelined* VFP, which actually makes it a lot faster than Cortex-A8 for double precision floating point workloads. You can have a look at the instruction cycle timings to get a better idea:
    ARM11 VFP - http://infocenter.arm.com/help/topic/com.arm.doc.d...
    Cortex-A8 VFP - http://infocenter.arm.com/help/topic/com.arm.doc.d...

    Thanks.
    Reply
  • Anand Lal Shimpi - Friday, October 07, 2011 - link

    Thank you! Fixed :)

    Take care,
    Anand
    Reply
  • icrf - Friday, October 07, 2011 - link

    An ARM Cortext A9 has an 8 stage pipeline, not 9: http://www.arm.com/files/pdf/ARMCortexA-9Processor... Reply
  • Anand Lal Shimpi - Friday, October 07, 2011 - link

    Thanks :)

    Take care,
    Anand
    Reply
  • Blaster1618 - Friday, October 07, 2011 - link

    Maybe a noob, but I did not know that L0 memory could operate at GHz clock rate (5-10 times that of SD Ram clock rate. Good stuff, keep it coming. B-) Reply

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