Ad hoc bandwidth requests and power conservation in 5G wireless networks with tiny cells.

The contention-based bandwidth request and power management mechanisms aim to improve the spectral efficiency and power consumption in Fifth Generation (5G) wireless networks to support massive Internet of Things (IoT) devices. However, when these mechanisms as combined together, they exhibit increased access delay with contention bandwidth request and response delay during power management. This tradeoff is due to the improper selection of contention window during backoff mechanism, and the duration and position of listen interval during power management. Here, the suitability of message and code-based mechanism for single hop and two-hop 5G wireless relay networks has been investigated. In single hop network, the devices set their contention window either by message or code based base station assisted backoff along with combined cyclic binary exponent power saving mechanism. In two-hop wireless network, devices set their contention window by multi-layered bandwidth request with combined power saving class mechanism. Simulations are carried out under high mobility conditions to validate the proposed mechanisms.