HSDPA (High Speed Downlink Packet Access) is a UMTS packet air interface (add-on solution on top of
3GPP R4 architecture) that allows higher downlink peak data rates than UMTS.
In addition, HSDPA provides lower latency with reduced Round Trip Delays enabling great interactive applications like multi-user gaming.
HSDPA introduces a new common high speed downlink channel shared by several users. It also introduces enablers for the high speed transmission at the physical layer (see next slide).
The various system evolutions triggered by HSDPA implementation are restricted to the access network and there is no modification to the core network and traffic classes.
HSDPA is based on techniques such as Adaptive Modulation and Hybrid ARQ to achieve high data throughput, high peak rates and reduce delay.
It relies on a new type of transport channel, the HS-DSCH, which is terminated in the Node B. HS-DSCH is applicable only on PS domain RABs.
It can significantly increase user data rates but only for ‘best effort’ services such as Internet access or file download.
In a first step, HSDPA is not intended as a solution for real-time services that require guaranteed QoS and also places heavy demands on terminals – initial deployments are expected to be confined to 3G data cards on laptops.
HSDPA standardized by 3GPP R5 to:
In addition, HSDPA provides lower latency with reduced Round Trip Delays enabling great interactive applications like multi-user gaming.
What is 3rd Generation (3G) or IMT-2000?
Channel Element at R99/HSDPA/HSUPA in 3G Network
HSDPA introduces a new common high speed downlink channel shared by several users. It also introduces enablers for the high speed transmission at the physical layer (see next slide).
The various system evolutions triggered by HSDPA implementation are restricted to the access network and there is no modification to the core network and traffic classes.
What HSDPA has been designed for?
HSDPA is based on techniques such as Adaptive Modulation and Hybrid ARQ to achieve high data throughput, high peak rates and reduce delay.
It relies on a new type of transport channel, the HS-DSCH, which is terminated in the Node B. HS-DSCH is applicable only on PS domain RABs.
It can significantly increase user data rates but only for ‘best effort’ services such as Internet access or file download.
In a first step, HSDPA is not intended as a solution for real-time services that require guaranteed QoS and also places heavy demands on terminals – initial deployments are expected to be confined to 3G data cards on laptops.
HSDPA standardized by 3GPP R5 to:
- Increase the Downlink data throughput
- Manage Non-Real Time applications (interactive and background class)
- provide instantaneous high data rates in the PS domain (e.g. Internet browsing, video on demand)
- HSDPA could be deployed in both Frequency Division Duplex (FDD) and Time Division Duplex (TDD) modes (both high and low chip rates)
Why does wireless communication system need multiple access techniques?
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