Question

Which among the following factors influence round trip time?

(a) Access technology

(b) Power efficiency

(c) Cost

(d) Frequency of operation

I had been asked this question during a job interview.

The doubt is from Next Generation Wireless Network in section Next Generation Wireless Network of Cognitive Radio

Answer 1

The correct answer is:

(a) Access technology

Round trip time (RTT) refers to the time taken for a signal to travel from the source to the destination and back again. Several factors influence RTT, and the most relevant one from the options provided is access technology. Here's why:

1. Access technology: Different access technologies (e.g., LTE, Wi-Fi, 5G) have different characteristics in terms of signal propagation, transmission speed, and latency. For instance, newer technologies like 5G offer much lower latencies compared to older technologies like 3G, which significantly affects the RTT.

The other options, while important in wireless communications, don't directly influence RTT in the same way:

• Power efficiency: While power consumption is a key concern in wireless networks, it doesn't have a direct impact on the RTT.
• Cost: This typically relates to the infrastructure and service costs, not the time it takes for signals to travel.
• Frequency of operation: While frequency can affect signal range and propagation characteristics, it doesn't directly correlate with the round trip time in a straightforward way.

So, the most appropriate answer is (a) Access technology