Comparison Between Wimax And HSDPA

ABSTRACT:

The future of wireless networks lies in the coexistence of multiple access network technologies. This paper deals with two data oriented access networks, the worldwide interoperability for microwave access (WiMAX) and the high speed downlink packet access (HSDPA). HSDPA and Mobile WiMAX are two different high speed mobile technologies with distinctive backgrounds. WiMAX is based on OFDM as HSDPA is based on CDMA.

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INTRODUCTION:

The objective of this paper is to provide a techno-economic comparison of two wireless broadband technologies, Mobile WiMAX and HSDPA. The comparison is divided into two parts. The first part is a general overview and comparison of the two technology standards. The second part describes the different releases of WiMAX and HSDPA and the market opportunities.

What is WiMAX?

WiMAX is the new term for IEEE 802.16 STANDARD. It is based on the wireless MAN technology. It is a communication technology that works with the radio spectrum to transmit tens of MB/sec in bandwidth between different devices like

laptops. The two stimulating forces of present internet are the wireless and the broadband. The WiMAX standard joins the two high speed broadband internet access over a single wireless connection. As WiMAX can be used for long distance purposes it is a very effective way to solve the last mile problem. WiMAX would operate similar to a Wi-Fi but at higher speeds, large distance and for more number of users. WiMAX has the capability to provide service in areas which are difficult for wired infrastructure to reach and has the ability to overcome the limitations of the traditional wired infrastructure. It will provide wireless broadband access to the buildings, either to existing wired networks or in the rural areas. It can also be connected to the WLAN hotspots to the internet.

Some of the characteristics of Mobile WiMAX are:

1. Scalability: Mobile WiMAX has been framed in such a way that it is able to work in different channel BW’s ranging from 1.25 to 20 MHz.
2. High Data Rates: when Maximum Input Maximum Output (MIMO) 2*2 is used and DL: UL is in the ratio of 1:0 and 0:1 respectively, in a 10 MHz channel high data rates can theoretically support peak download data rates up to 63Mb/s per sector and peak upload data rates up to 28 Mb/s per sector.
3. Mobility: Seamless handoff which is less than 50ms latency and < 1% packet loss is supported. Upto 120 km/hr of mobility has been tested for Mobile WiMAX.
4. Quality of Service (QoS): QoS measures for WiMAX include availability of service, throughput of data, jitter and the rate of error.

WHAT IS HSDPA?

High speed Downlink packet access (HSDPA) is a packet based data service feature of the WCDMA standard. In the WCDMA downlink, the data transmission is up to 8-10 Megabits/sec over a bandwidth of 5MHZ. It is sometimes referred to as a 3.5G technology. HSDPA is an advancement of the WCDMA standard which is created to increase the data rate by a factor of 5 or more. HSDPA improves on W-CDMA by

using different techniques for modulation

and coding. It defines a new WCDMA called high-speed downlink shared channel (HS-DSCH). That channel performs contrastingly from other channels and helps to fasten the downlink speeds. HS-DSCH is used only for the downlink communication of the mobile. That means that data is

sent from the source to the phone. It isn’t

possible to send data from the phone to a

source using HSDPA. The channel is shared

between all users which lets the radio

signals to be used most effectively for the

fastest downloads.

Multimedia:

From the technical point of view the choice between voice communications in VoIP/WiMAX or WCDMA/HSDPA is a matter of taste. But not in economic terms – WCDMA traffic is much costlier than VoIP traffic. For transmitting multimedia data both technologies have practically the same capacities. Both WiMAX and HSDPA have traffic prioritizing and Quality of Service.