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Queensland University of Technology EGH443: Advanced Telecommunications Tutorial 1 Tutorial Problems

Question 1 Label the blocks in following GSM network and briefly describe the functionalities of each block.

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Update : March 7, 2019

Question 2 If GSM uses a frame structure where each frame consists of eight time slots and each time slot contains 156.25 bits, and data is transmitted at 270.833 kbps in the channel, find 1. the time duration of a bit 2. the time duration of a slot 3. the time duration of a frame 4. a hyperframe of a GSM system is 3h 28m 53s 760ms long. Describe why such a long frame structure is required in GSM systems. 5. Draw the burst structure of the Random access channel and describe it’s functionality. 6. Estimate the number of bursts required to transmit a 20 ms voice segment.

Question 3 1. Using the repetition code of length 4, what is the probability that the word (0, 0, 0, 0) is decoded correctly in the binary symmetric channel with error probability p = 0.3 2. If I encode the message m = 01 using a repetition code of length 4, and transmit the word through a binary symmetric channel with error probability p = 0.3, what is the probability that message is decoded properly?

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