Relay reliability refers to the ability of relay nodes to maintain stable and efficient communication links between source and destination devices. In many modern communication systems, especially wireless networks, direct communication between the source and destination may not always be feasible due to factors such as distance, interference, or environmental obstacles. Relay nodes serve as intermediaries that forward data from one point to another, often improving signal strength, coverage, and overall network performance.

    However, the effectiveness of relay nodes hinges on their reliability. A reliable relay node ensures that data is transmitted without significant delays, errors, or losses. It also needs to operate efficiently without depleting its energy resources, particularly in wireless sensor networks or mobile devices with limited power.