09 Apr '13, 10am

The impact of four generations of mobile phone technology - New Electronics (blog): The impact of four generat...

Getting to that first mobile phone call had taken many years. Although car phones were in use in the US and the UK, these large and heavy systems remained tethered to the car. Bell had already launched a commercial system using cellular principles in 1969. The service, which was available on trains running between Washington and New York, used trackside hardware to switch calls and demonstrated some of the principles involved in handing calls over and frequency management. It took another 10 years before the problem of handing over mobile phone calls was solved satisfactorily – systems engineers finally realised the mobile phone world was 3d. While handing calls over between cells worked well enough if you were on the street, it wasn't so good if you were up a New York skyscraper. As users moved around, their phones linked with different cells – but not the ones which the ...

Full article: http://www.newelectronics.co.uk/electronics-blogs/the-imp...

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