Last Updated: 07/02/2010
What does HSDPA stand for?
So what exactly is HSDPA?
Interesting! Is HSDPA part of 3G or will it be part of 4G?
Why not similarly have HSUPA where U stands for uplink?
Are HSDPA networks rolled out and can i buy HSDPA capable phones?
Can existing 3G Networks be upgraded to support HSDPA with new Software release?
What could be the possible uses of HSDPA?
How did 3GPP manage to increase the speed of DL to over 10Mbps?
Is HSDPA applicable for CS and PS RABs both?
Is HSDPA applicable in CELL_FACH or CELL_DCH or both the UE states.
Can you give comparison of HSDPA in FDD & TDD Mode?
Where can i find basic tutorial on HSDPA?
I would like to follow all HSDPA related News, which is the best place to look for?
I am a researcher and i would like some references to read more on HSDPA.
HSDPA stands for High Speed Downlink Packet Access
HSDPA is an enhancement to the 3G technology through which you can increase the DL data rates from 384Kbps (theoretically 2Mbps) to 10Mbps (theoretically 14Mbps). Here Kbps stands for Kilo bits per second and Mbps stands for Mega bits per second. HSDPA delivers higher capacity through improved spectral effeciancy, which provides higher data rates, shorter response times and better Qos (Quality of Service).
HSDPA is part of 3G but people also refer to it as 3.5G. More details here.
There is already a HSUPA. More details available in HSUPA FAQ here.
In most of the countries, HSDPA networks have already been rolled out and HSDPA phones are already available. You can find the latest status of HSDPA capable networks in different countries on the GSMA website here.
In theory they can be but it might not always be the case. According to The Register HSDPA is a power-hungry technology, and many of the base stations out there arenít up to the job. The key piece of technology is the power amplifier, which has to be a full power, 45-watt model, to handle the extra data output. Having said that, most of the new newly designed RNC and Node B's are now capable of handling not just an upgrade from 3H to HSDPA and HSPA+ but also to LTE.
The same use as that of Broadband connections at home. It would be possible to watch extremely good quality real time Videos, download complete song tracks in less than a minute. Do real time video conferencing with more than one user using very high quality video. Eventually the wireless operators plan that instead of having wired broadband at home, people will move to wireless broadband. The list is non exhaustive.
To increase the data rates a new channel called HS-DSCH (High speed downlink shared channel) was defined. This was somewhat similar to the DSCH defined in the release 99 specs. This channel maps to HS-PDSCH (high speed physical downlink shared channel). To support this data channel a control channel HS-SCCH (High speed shared control channels). The HS-DSCH is transmitted over the entire cell or over only part of the cell using e.g. beam-forming antennas.
The increased data rates are supported through the introduction of Fast and Complex channel-control mechanisms based on a short fixed packet TTI (transmission time interval), AMC (adaptive modulation and coding) and L1 HARQ (layer1 hybrid automatic repeat request).
In release 5 HSDPA is only applicable for PS streaming/interactive/background RABs. In release 6, HSDPA will be used for Signalling Radio Bearers as well.
HSDPA is only applicable to CELL_DCH state.
Please see the following Tutorial.
References as follows: