Читать книгу Dynamic Spectrum Access Decisions - George F. Elmasry - Страница 22

1 Consider a hybrid DSA system you are designing with 10 mins minimum elapsed time before changing frequency assignment for a large‐scale set of heterogeneous networks. One of these heterogeneous networks has distributed agents in its nodes that make DSA decisions for the network and these decisions can take up to 200 ms due to spectrum sensing information propagation time and processing time. If you are asked to come up with a minimum time interval for a local agent to make a local DSA decision (time elapse after making a local DSA decision before you can consider making another one), which of the following time intervals would you choose?200 ms100 ms20 msExplain the reason for your choice.

2 In a hybrid DSA system, would you want a local DSA decision (e.g., power increase) to be propagated to peer agents that make distributed decisions? Explain your reason.

3 You are given a set of heterogeneous wireless networks with one network that operates at a narrowband of 100 kbps. Your analysis of DSA shows that DSA control traffic (e.g., spectrum sensing information and other DSA configuration parameters) would use about 30 kbps over this narrowband network. Would you proceed with your DSA design or consider assigning the narrowband network a fixed frequency band to operate at? Explain the reason for your choice.