Systems and methods for performing memory management among a plurality of devices in a network are described. A self-discarding propelling charge holder is made up of multiple segments. A request transmitted from the first user system via the communication network is received at the second user system. Solar energy stored in porcelain fragments extends the time that solar energy can be used as the heat source for the thermoelectric generator device. The portable satellite data communication device also has built-in functionalities for monitoring the satellite signal and the arrival of new messages at the satellite gateway. The method includes receiving, by a base station, one or more service data unit from a core network node; receiving, by the base station, a control message including respective length information of the one or more SDUs from the core network node; and processing, by the base station, the one or more SDUs, based on the length information included in the control message.