Network Coding and Wireless Physical-layer ... - Jacobs University

Chapter 6: Wireless Physical-layer Secret-key Generation (WPSG) in Relay Networks:
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Information Theoretic Limits, Key Extension, and Security Protocol
Source
address
Request
ID
Destination Source Destination
address sequence no. sequence no.
Hop
count
Pilot sequence
Figure 6.10: The proposed pilot packet format for the RSF Protocol
5. After reading the header, E discards the packet, whereas A successfully
receives it, together with the correct channel information.
Apart from the randomness employed in the protocol, the RSF protocol is similar to
the ad hoc on-demand distance vector (AODV) algorithm used for routing in mobile ad
hoc networks (MANETs) in many aspects. One aspect is that both algorithms determines
a route to a destination only when someone wants to send a packet to that destination
[7, 13]. Therefore, we propose a pilot packet format in Fig. 6.10 which is similar to the
ROUTE REQUEST packet used for the AODV algorithm. The source address, which is
the transmitter’s address, together with the request ID, which is a counter incremented
whenever a pilot packet is sent, uniquely identify each pilot packet so that intermediate
nodes know whether the packet should be discarded.
The destination address is the
receiver’s address. The source sequence number and the destination sequence number are
local counters updated by the transmitter and the receiver, respectively, for each pilot
packet transmission. The hop-count field is introduced so that flooding is limited to a
reasonably narrow region.