Archive for the ‘Smartphone’ category

How much power for WiMax?

November 11, 2008

How much transmit power do WiMAX nets need? Designers must find the optimal balance between high transmit power and low power consumption to ensure robust links, high data rates and good range for WiMAX services.
A typical WiMAX basestation transmits at power levels of approximately +43 dBm (20 W), and the mobile station typically transmits at +23 dBm (200 mW). There is a large difference between downlink power and uplink power. While a mobile can easily receive transmissions from a basestation, the mobile’s low transmit power makes it difficult for the basestation to hear it, Wireless Net DesignLine, explain.
One technique to address the link imbalance is adaptive modulation. In this case, the mobile transmits using a lower order modulation compared with the basestation. For example, the mobile could transmit QPSK or 16QAM signals, while the basestation transmits using 64QAM.

Another way to combat this mismatch is with a technique called subchannelization. In effect, each mobile concentrates its power over a subset of all available subchannels, and the other subcarriers are simultaneously made available to other users.

Networks are currently being deployed specifying that the minimum transmit power is +23 dBm. Each user who enters a network transmitting at powers greater than +23 dBm increases overall network efficiency. However, delivering higher transmit powers comes at a cost to power consumption.

The Mobile WiMAX network will cover 120-140 million people in the U.S. by year-end 2010. If those people are using Android devices, Google will indeed become a force in the market, although still behind Symbian,Windows Mobile and Apple’s iPhone.

Apple, Research In Motion and Google are duking it out for consumers’ smartphone dollars this fall. But Time Warner’s AOL has just landed a giant contract to push Google’s G1 phone for the next two days through AOL’sPlatform-A ad network. It has agreed to buy a billion impressions today and tomorrow, reports AdAge.

Practical Mobile WiMAX devices in small form factors may be a year off, say industry insiders. Intel Moorestown should enable practical battery life with integrated Wi-Fi/WiMAX chips.

LTE operators like femtocells because the cost of the broadband infrastructure can be shifted to end users. Part of the new Clearwire deal calls for 5 MHz of spectrum to be set aside solely for WiMax femtocells. Perhaps ‘free’ whitespace femtocells, in the tv band, will create new business models for end users and municipalities.


Symbian = Open Source like Android thanks to Nokia.

June 26, 2008

SymbianOS ‘One of the biggest contributions to an open community ever made,’ was how Nokia’s CEO, Olli-Pekka Kallasvuo, positioned the company’s decision to buy out the other investors for €264 million and make the Symbian operating system open source. While this all sounds like a grand and worthy gesture, Nokia’s strategy is to increase the pressure on Microsoft, Apple and Google over who will win the battle for dominance of the smartphone operating system market.

The company plans to launch the non-profit Symbian Foundation, combining several different operating systems including Symbian OS, UIQ, MOAP and S60 and making the whole system open source, so that developers can use the technology for free. This model is not new having been adopted by the computer industry for many years. Perhaps of greater interest is the involvement of AT&T, DoCoMo and Vodafone in the new Symbian Foundation, along with the predictable names of Samsung, Sony Ericsson, STMicroelectronics and Texas Instruments–with Qualcomm being noticeably absent.

As estimated Nokia paid out more than US$250M in Symbian licence fees last year, so it makes commercial sense to buy Symbian for about US$410M, rather than keep paying what is effectively a subsidy to the other shareholders.

But this announcement does raise questions: 

– With Nokia now controlling Symbian, how open can the system really be?

– Can Symbian keep pace with or overtake the iPhone’s user interface?

– Will Nokia now ignore Linux, or does it have a plan to use this alternative open platform for its high-end multimedia devices?

– Will the Symbian Foundation (cumbersome committee?) be able to react in a timely manner to whatever the competition might offer?

Guardian: Nokia buys Symbian in web push.
Telegraph: Nokia to rival Google with Symbian buyout


RIM, Palm are shaking up smartphone market as we are expecting the new iPhone next week.

June 4, 2008

Surprise! Palm goes and regains some lost ground in the smartphone market.

Palm has apparently seen its smartphone market-share rise to 13.4%, up from 7.9% in Q4 2007. The popular Palm Centro is credited for helping boost the ailing smartphone manufacturer’s market-share.

RIM, makers of the popular push-emailing BlackBerry lineup of smartphones, has also seen a rise in smartphone market-share. RIM saw their BlackBerry smartphones take 44.5% of the smartphone market, up from 35.1% in Q4 2007.

But, there’s always two sides to every story. While RIM and Palm saw their market-share increase, Apple saw its market-share slide. The iPhone took a healthy US smartphone market-share of 26.7% in the fourth quarter last year. But, it seems that RIM and Palm’s success has eaten in to the iPhone’s niche. The iPhone accounted for just 19.2% of smartphones sales in the first quarter of 2008, compared to  26.7% of sales in Q4 2007.

CNN Money: RIM, Palm grab iPhone market share.

RIM allows Indian government to monitor Blackberry network

May 22, 2008


Big Brother 

Well, it took longer than 15 days to reach a resolution, but apparently RIM is going to back down and allow the Indian government to monitor the Blackberry network in that country. What’s worse, it appears that RIM was more interested in covering its own ass than protecting user data during the negotiations: the only concession the company received from the Indian government was a promise that it won’t be held liable if there’s a leak of users’ personal information. Now, I fill better.