Sorry I was busy and away from the net for a while. This is why I couldn’t reply till now. Anyhow, here is a few lines about HSDPA and 4G:
High-Speed Downlink Packet Access (HSDPA) is a mobile telephony protocol, also referred to as 3.5G (or 3?G) technology, which provides a smooth evolutionary path for UMTS-based 3G networks allowing for higher data transfer speeds, up to 14.4 Mbit/s per cell in the downlink and 2 Mbit/s per cell in the uplink.
An evolution of the W-CDMA standard, HSDPA achieves the increase in the data transfer speeds by defining a new W-CDMA channel: a high-speed downlink shared channel (HS-DSCH) that operates in a different way from existing W-CDMA channels and is used for downlink communications to the mobile.
4G (or 4-G) is short for fourth-generation, the successor wireless access technology to 3G. It is not used consistently, but generally describes several different, but overlapping ideas. The IEEE (Institute of Electrical and Electronics Engineers) official name for 4G is “3G and beyond”.
4G technology stands to be the future standard of wireless devices. The Japanese company NTT DoCoMo and Samsung are testing 4G communication at 100 Mbit/s while moving, and 1 Gbit/s while stationary . NTT DoCoMo plans on releasing the first commercial network in 2010 and Samsung plans on commercialising this service by 2010 at Jeju Island, South Korea. Despite the fact that current wireless devices seldom utilize full 3G capabilities, there is a basic attitude that if you provide the pipeline then services for it will follow.
Pervasive networks. An amorphous and presently entirely hypothetical concept where the user can be simultaneously connected to several wireless access technologies and can seamlessly move between them (See handover, IEEE 802.21). These access technologies can be Wi-Fi, UMTS, EDGE or any other future access technology. Included in this concept is also smart-radio (also known as cognitive radio technology) to efficiently manage spectrum use and transmission power as well as the use of mesh routing protocols to create a pervasive network.
In general, a new generation is defined by the result of technology changes over a 10-15 year time frame. Thus, 4G would refer to whatever is deployed in the 2010-2015 period, assuming 3G deployment spans the 2000-2009 period. However, 3G is regarded by many as being a bit of a ‘flop’, so telecommunications companies are planning to roll out 4G earlier (possibly as early as 2008). The Chancellor of the Exchequer in the United Kingdom will auction 4G frequencies in autumn 2006.
Typically, a new standard means a new air-interface with higher data rates in the least, and some see change in the way data transport is handled end-to-end.
Ideally, 4G would provide users with on demand high quality video and audio. The killer application of 4G is not clear, but video is one of the big differences between 4G and 3G. 4G may use OFDM (Orthogonal Frequency Division Multiplexing), and also OFDMA (Orthogonal Frequency Division Multiple Access) to better allocate network resources to multiple users. 4G devices may use SDR (Software-defined radio) receivers which allows for better use of available bandwidth as well as making use of multiple channels simultaneously.
Unlike the 3G networks which are a jumble of circuit switched and packet switched networks, 4G will be based on packet switching only. This will allow low-latency data transmission.
And yes I work with international team so I have to use English with them all the time.