Novel Wake-Up Signaling for Enhanced Energy-Efficiency of 5G and beyond Mobile Devices

Abstract

A low-power and low-latency communication system is vital to extend 5G mobile devices functionality, and to introduce innovative services and applications; on the contrary, limitations of state-of-the-art cellular subsystems prevent designing such a system based on current power saving mechanisms alone. In this paper, a new wake-up signaling for 5G control plane is introduced, aiming to reduce energy consumption of cellular subsystem in downlink. Performance of the proposed scheme in terms of false alarm and misdetection are investigated, and evaluated. The obtained numerical results show that such a signaling can reduce power consumption of discontinuous reception (DRX) by up to 30%, at the cost of negligible increments in signaling overhead.

Wake-Up Radio Based Access in 5G Under Delay Constraints: Modeling and Optimization

“…Namely, a) with simplified assumptions of zero false alarm/misdetection rates, and t on ≈ 0 ms, equivalent to analytical results (ana. ), and b) with the realistic assumptions of P f a = 10%, P md = 1%, t on = 1/14 ms obtained by simulations and [20], referred to as simulation results (sim.). Table IV shows the optimal resulting values of t * w in (48) for different values of λ and D max .…”

“…After the inactivity timer is initiated, and if a new PDCCH message is received before the time expiration, the BBU enters the active-decoding state and serves the packet. However, if there is no PDCCH message received before the expiration of the inactivity timer, a sleep period starts, the WRx-enabled cellular module switches to sleep state, and WRx operates according to its wake-up cycle [20]. For reference, in case of DRX, the BBU sleeps according to its short and long DRX patterns [15], [33].…”

“…The introduction of a PDWCH has two fundamental consequences, namely misdetections and false alarms [20]. In the latter case, WRx wakes up in a predefined time instant, and erroneously decodes a WI of 0 as 1, leading to unnecessary BBU power consumption.…”

“…To improve the device's energy-efficiency beyond the capabilities of ordinary DRX, the concept of wake-up radio based access has been discussed, e.g., in [6], [18], [19]. Specifically, in the cellular communications context, the wakeup radio based approaches have been recently discussed and described, e.g., in [20] and [21]. In such concept, the mobile device monitors only a narrowband control channel signaling referred to as wake-up signaling at specific time instants and subcarriers, in an OFDMA-based radio access systems such as LTE or NR, in order to decide whether to process the actual upcoming physical downlink control channel (PDCCH) or discard it.…”

Proactive Wake-up Scheduler based on Recurrent Neural Networks

“…However, it has been shown in [5] that the time period that a DRX-enabled mobile device spends monitoring the physical downlink control channel (PDCCH) without any data allocation has a major impact on its battery lifetime. In order to reduce the energy consumption of unscheduled cycles in DRX, the wake-up scheme (WuS) has been recently proposed in [6]. In WuS, the mobile device monitors a narrow-band wake-up signaling periodically (every wake-up cycle) at specific time instants and subcarriers, which indicates to the device whether to process the upcoming PDCCH or remain in sleep mode.…”