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We consider a two-way data exchanging system where a master node transfersenergy and data packets to a slave node alternatively. The slave node harveststhe transferred energy and performs information transmission as long as it hassufficient energy for current block, i.e., according to the best-effort policy.We examine the freshness of the received packets at the master node in terms ofage of information (AoI), which is defined as the time elapsed after thegeneration of the latest received packet. We derive average uplink AoI anduplink data rate as functions of downlink data rate in closed form. Theobtained results illustrate the performance limit of the unilaterally poweredtwo-way data exchanging system in terms of timeliness and efficiency. Theresults also specify the achievable tradeoff between the data rates of thetwo-way data exchanging system.

Uplink Age of Information of Unilaterally Powered Two-way Data Exchanging Systems