The 4G crunch

摘要

With 4G wireless networks promising a future filled with ultrafast mobile web surfing, you could be forgiven for daydreaming about lolling on the beach streaming HD video on your smartphone. If you live in the US at least, you can keep dreaming. "A friend got one of the first 4G smartphones in New York a few months ago and exclaimed how wonderful it was," says Robert Atkinson of the Columbia Institute forTele-lnformation at Columbia University in New York. Now, Atkinson says, "he has already noticed slowdowns