A few weeks ago I put the provocative title "LTE and spectrum stupidity" on a blog post, prompting a flurry of objections in the comments. (Thanks guys. I enjoy controversy). My complaint was that, despite defining both FDD and TDD versions of LTE, the industry had only implemented the FDD version even though TDD can better match available capacity to data traffic demands that can vary widely between 10 ms LTE frames.
It's obvious from the comments that I didn't win over all objectors and I haven't had time to write an article on short term (10 ms) Internet traffic variations, but I did notice this article at dailywireless.org and, in particular, this article at Light Reading which lists a large group of companies, both operators and equipment providers, who have supported a request by Clearwire that the 3GPP specify how TD-LTE should work across the 2.6 GHz spectrum. In addition to Clearwire,
... there was broad industry support for the proposal from other companies, including: Sprint Nextel Corp. (NYSE: S), NII Holdings Inc. (Nasdaq: NIHD), China Mobile Communications Corp. , UK Broadband Ltd. , Motorola Inc. (NYSE: MOT), Huawei Technologies Co. Ltd. , TD Tech Ltd. , WiChorus Inc. , ZTE Corp. (Shenzhen: 000063; Hong Kong: 0763), Chinese Academy of Telecommunications Technology , Nokia Siemens Networks , Cisco Systems Inc. (Nasdaq: CSCO), Sequans Communications , Alcatel-Lucent (NYSE: ALU), Alcatel Shanghai Bell Co. Ltd., and Rohde & Schwarz GmbH & Co. KG.
Part of the 2.6GHz band is already specified for TDD, namely the 2570MHz-to-2620MHz band. The new work at the 3GPP will ensure that all of Clearwire's spectrum will have a definition for TD-LTE operation and will get the TD-LTE specs in line with Federal Communications Commission (FCC) requirements as well.
It will take a few years to play out, but we should get real data on real traffic using TD-LTE within five years. Before then, I'll try and find time to gather the data and write the definitive article on millisecond-to-millisecond Internet traffic variation (but not in the next few weeks - sorry).
As the dailywireless.org article says, "In a data-driven world, symmetrical pipes can be a waste of space." And even when long term data averages are symmetric, short term variations in IP traffic are extreme (see the 3rd diagram here: http://su.pr/1Vmge3 ).