PPSC - Past Papers - Most Repeated — Test 21

Correct Answer: B. B. Modulation scheme
Explanation: Wireless link errors are parameters of importance in characterizing the spectrum band. The modulation scheme and the amount of interference in the spectrum band influence the error rate. Wrongful sensing decisions are also a contributing factor to the high error rate.

Correct Answer: A. A. Selection of appropriate protocol
Explanation: Each spectrum band is assigned a different protocol with respect to the interference level, path loss, and wireless link errors of the band. The link-layer packet transmission delay differs with different protocols.

Correct Answer: C. C. The duration over which the xg user can use the licensed spectrum band
Explanation: Holding time refers to the period over which the xG user can occupy the licensed spectrum band before the arrival of the primary user. High holding time ensures high quality. Statistical handoff patterns are used to construct xG networks with longer holding time.

Correct Answer: D. D. Reconfiguration
Explanation: Transmission parameters of a radio should be reconfigurable for effective operation in certain spectrum bands. For example, if the signal to noise cannot be modified, then the bit error rate can be altered to maintain the channel capacity by employing adaptive modulation techniques.

Correct Answer: A. A. A €? link layer delay, b €? scheduling information
Explanation: Link-layer delay is one of the defining parameters of quality of service. Various link layer protocols suitable for different path loss, wireless link error, and interference are available. Link layer packet transmission delay changes with respect to the selected protocol. Scheduling information ensure fair sharing of spectrum resources in the unlicensed spectrum band.

Correct Answer: A. A. 1997
Explanation: Broadband Radio Access Network project was inaugurated in April 1997, considering the massive composition of Broadband radio Local Access Network (LAN) technology and also to fulfil upcoming enhancements in Multi Media applications.

Correct Answer: B. B. Hiperlan/1
Explanation: The European Telecommunication Standards Institute (ETSI) has broadly classified into 3 categories of Broadband Radio Networks specifically HIPERLAN/2, HIPERACCESS and HIPERLINK.

Correct Answer: B. B. False
Explanation: Among all categories of Broadband Radio Networks including HIPERLAN/2, HIPERACCESS and HIPERLINK, HIPERLAN/2 is ultimately responsible for engaging data transmission between broadband core networks and transportable computing devices. HIPERACCESS provides efficient transmissions to households and small business zones.

Correct Answer: D. D. Reduced bit rate
Explanation: Broadband Radio Access Network functionality ultimately aims to improve specifications which provide effective functionality at minimum cost. Their key requirement includes reduced cost, interoperability, managed Quality of Service and enhanced bit rates.

Correct Answer: B. B. Hiperlink
Explanation: HIPERLINK is exclusively utilized in infrastructure technologies considering its immense speed capability. Though HIPERLAN/ 2 and HIPERACCESS comprise greater speed functionality, they are utilized in multimedia applications and residential technologies respectively.