Explain: a.) HSN b.) DTX c.) DRX – TRX

GSM - Explain: a.) HSN b.) DTX c.) DRX – TRX - Jan 15, 2011 at 15:45 PM by Vidya Sagar

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Explain: a.) HSN b.) DTX c.) DRX – TRX

a.) HSN

• Hopping sequence number is utilized, to spread the interference between all cells that uses the same hopping TCHs
• The correlation between closely located cells can be avoided by using HSN
• HSN of zero corresponds to the cyclic hopping sequence, and 1 through 63 corresponds to various pseudo random patterns.

b.) DTX

• Discontinuous Transmission is one of the methods which is based on the advantage of the fact that a person speak less
• Nearly 40% of time in general conversation, the transmitter is turned off during silence periods
• Mobile phone power conservation is an added benefit of DTX
• Voice Activity Detection is the most important component of DTX
• DT X distinguishes between voice and noise inputs.
• The transmitter is turned off when a voice signal is misinterpreted as noise. This causes annoying effect known as clipping is heard at the receiver’s end
• Comfort noise is created at the receiving end, in order to ensure the non-connection.

c.) DRX – TRX

DRX:

• DRX is referred as driver receiver.
• DRX performs the transmission and reception of signals
• Sends and receives the signals to or from higher network entities, as in base station controller in mobile telephony

TRX:

• The transceivers allows to serve several frequencies and different sectors of the cell
• Sends and receives signals from / to higher network entities. 

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What do you mean by ARFCN?

Absolute Radio Frequency Channel Number, a code to specify a pair of physical radio carriers and channels within the spectrum that is allocated for cellular mobile communications..............