Is the Packetized Transmission Efficient? An Age-Energy Perspective

This paper focuses on the average age of information ( A oI) and average energy consumption for the packetized transmission in status update systems, where the energy consumptions for both update sensing and transmission are considered. We equally segment each sensed k-bits update packet into N subpackets, and each kp-bits subpacket is encoded as an np-bits block by using the LDPC codes and is transmitted to the monitor over an additive white Gaussian noise channel. The expressions for the average AoI and average energy consumption are derived and expressed as functions of block error rate and the number of the subpackets N. Numerical simulations show that when the channel condition is good enough, the packetized transmission is energy efficient and does not effect the average A oI. However, when the channel condition is bad, the packetization scheme is age efficient but energy inefficient.