“The big push towards the Cloud, the Internet and ARM devices where contents of all kinds will drive sales where even TV and media will also embrace as more seek to drive costs down with an explosion of data to target customers where traditional media cannot provide, innovations will drive changes as global companies fill in the gaps to drive consumer demand with greater ROI.” – Contributed by Oogle.
TD-SCDMA (UTRA-TDD 1.28 Mcps low chip rate)
Main article: TD-SCDMA
TD-SCDMA uses the TDMA channel access method combined with an adaptive synchronous CDMA component on 1.6 MHz slices of spectrum, allowing deployment in even tighter frequency bands than TD-CDMA. However, the main incentive for development of this Chinese-developed standard was avoiding or reducing the license fees that have to be paid to non-Chinese patent owners. Unlike the other air interfaces, TD-SCDMA was not part of UMTS from the beginning but has been added in Release 4 of the specification.
Like TD-CDMA, it is known as IMT CDMA TDD within IMT-2000.
New TD-SCDMA with automatic switching to Extended WiFi
Time Division Synchronous Code Division Multiple Access (TD-SCDMA) or UTRA/UMTS-TDD 1.28 Mcps Low Chip Rate (LCR), is an air interface found in UMTS mobile telecommunications networks in China as an alternative to W-CDMA. Together with TD-CDMA, it is also known as UMTS-TDD or IMT 2000 Time-Division (IMT-TD).
The term “TD-SCDMA” is misleading. While it suggests covering only a channel access method based on CDMA, it is actually the common name for the whole air interface specification.
TD-SCDMA uses the S-CDMA channel access method across multiple time slots.
TD-SCDMA was developed in the People’s Republic of China by the Chinese Academy of Telecommunications Technology (CATT), Datang Telecom, and Siemens AG in an attempt to avoid dependence on Western technology. This is likely primarily for practical reasons, since other 3G formats require the payment of patent fees to a large number of Western patent holders.
TD-SCDMA proponents also claim it is better suited for densely populated areas. Further, it is supposed to cover all usage scenarios, whereas W-CDMA is optimised for symmetric traffic and macro cells, while TD-CDMA is best used in low mobility scenarios within micro or pico cells.
TD-SCDMA is based on spread spectrum technology which makes it unlikely that it will be able to completely escape the payment of license fees to western patent holders. The launch of a national TD-SCDMA network was initially projected by 2005 but only reached large scale commercial trials with 60,000 users across eight cities in 2008.
On January 7, 2009, China granted a TD-SCDMA 3G licence to China Mobile.
On September 21, 2009, China Mobile officially announced that it had 1,327,000 TD-SCDMA subscribers as of the end of August, 2009.
While TD is primarily a China-only system, it may well be exported to developing countries. It is not likely to be replaced with a newer TD-LTE system over the next 5 years. The present TD-SCDMA can be furthur developed to fully utilised the spectrum by studying the way ZFS technology packs data for transmission to create a new alogorithm. TD-LTE network is too expensive, it is not compatible to new future standards where you not only have to change base stations but handsets as well.
Posted in Mobile, 17th October 2012 10:01 GMT
More than 660,000 commuters are now accessing Virgin Media’s wireless network from ticket halls to platform level on the London Underground, the telco claimed today.
It said it was extending free access to the service, which doesn’t reach into tunnels and requires users to register with an email address, until the end of 2012.
The company had originally planned to begin charging non-Virgin Media customers for its service with the exception of a limited offering “including TfL’s journey planner and entertainment and news content useful for a commute to work or trip into town”, which was expected to continue to be free.