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Comparison: HSDPA VS WIMAX

Thursday, July 14, 20118comments

Theoretically, the range distance access WiMAX (Worldwide Interoperability for Microwave Access) can reach 30 km (equal to the range for GSM) with bandwidth speeds 75 Mbit / s. The farther from the base station terminal, the weaker signals from WiMAX. So the 3.5 GHz signal ratio will be much faster than GSM. As for HSDPA (High Speed ​​Downlink Packet Access) has a maximum speed of 14.4 Mbit / s in a distance of less than 1 km from the base station. Within a distance of 6 km, the data flow will drop to a speed of 1 Mbit / s.

HSDPA has some principle that is, if the user does not get higher bandwidth, HSDPA technology can still use the services of data transmission, but with a lower bandwidth (at the level of WCDMA or GPRS / EDGE), HSDPA is only capable of sending data transmission in a matter of dozen kilobits per second (Kbps).

The number of users. HSDPA technology can be used for multiple users simultaneously, while WiMAX is the best use of a limited role in the amount of, or in hundreds of terminals. Moreover there are serious problems that may occur on WiMAX in the corporate network, as user numbers increase. If all users suddenly decide to download large files from the Internet, it will affect the flow of data. However, in the case of HSDPA (this feature is derived from CDMA) for such cases, all users will receive a data stream is slow, while the WiMAX routers in the same situation, would likely fail to handle it.

Bandwidth. WiMAX and HSDPA bandwidth has the same width from the base station. WiMAX does not have a lot of frequency range, but WiMAX pick the many ways to develop it is by forming a new range of 10GHz to 66GHz, the new modulation schemes and MIMO (Multiple-Input-Multiple Output). As for HSDPA, which is the development of WCDMA, able to handle it for a matter of efficiency.

Multimedia. Both technologies have the same capacity for transmitting multimedia data. WiMAX and HSDPA have QoS and traffic priority. The choice between these two data communications, both in WCDMA / HSDPA or VOIP / WiMAX is a technical thing, but in economic terms, WiMAX traffic cheaper than HSDPA.

Security. HSDPA does not provide additional security functions. User authentication is done from the SIM card (or RUIM). Each user's data will be encoded differently according to the CDMA standard, and works much better than the cryptographic algorithms, unless there is an intruder who entered the base station or when an intruder is to get a channel code (such as a special agent). While WiMAX has been supported by modern cryptographic algorithms (eg AES with a key 1024 bits). WiMAX will please users who want to keep their data confidential, but confidentiality of user data will not last long, as the parable there is no security that can not be uprooted.
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