Resource Optimization in Device-to-Device Cellular Systems Using Time-Frequency Hopping

Abstract

Abstract-We develop a flexible and accurate framework for device-to-device (D2D) communication in the context of a conventional cellular network, which allows for time-frequency resources to be either shared or orthogonally partitioned between the two networks. Using stochastic geometry, we provide accurate expressions for SINR distributions and average rates, under an assumption of interference randomization via time and/or frequency hopping, for both dedicated and shared spectrum approaches. We obtain analytical results in closed or semiclosed form in high SNR regime, that allow us to easily explore the impact of key parameters (e.g., the load and hopping probabilities) on the network performance. In particular, unlike other models, the expressions we obtain are tractable, i.e., they can be efficiently optimized without extensive simulation. Using these, we optimize the hopping probabilities for the D2D links, i.e., how often they should request a time or frequency slot. This can be viewed as an optimized lower bound to other more sophisticated scheduling schemes. We also investigate the optimal resource partitions between D2D and cellular networks when they use orthogonal resources.

On the transmission mode selection for substation automation traffic in cellular networks

“…Constraint (14e) captures the uplink resource contiguity constraint due to the SC-FDMA scheme for the links in cellular mode [14]. Constraint (14f) implies that the fraction θ of resources allocated to D2D-overlay must be at most equal to one, according to (8). Performanceprotection constraint (14g) captures the requirement that the minimum rate requirement, R i,min , has to be met for each link i ∈ C associated with a guaranteed bit rate (GBR) of humantype services.…”

“…Sc ← Sc ∪ {i} 32: (8) allocation algorithm proposed in [14], the joint consideration of D2D-capable IEDs requires an efficient mechanism for a dynamic selection of the transmission mode and allocation of data resources with performance guarantees. We provide the details in the following.…”

“…However, the majority of the available literature is focused on distance-based mode selection schemes and the channelaccess loading state is not considered for switching between direct and conventional cellular communication [3]. While in D2D-underlay several works deal with the mode selection problem in an effort to achieve improved spectrum/power efficiency [4], [5], the focus in D2D-overlay has been mainly in the self-interference mitigation among D2D pairs [6]- [8]. Mode selection and spectrum partition techniques proposed in the literature so far, do not consider the sporadic nature of mission-critical smart grid information; hence, they are rendered insufficient for event-driven distribution grid operations where congestion may arise in a short period of time.…”

Device-to-device meets LTE-unlicensed

“…Due to the mobilities of devices and the complex interference effects, traditional static radio planning can prove to be difficult to apply, while statistical methods have recently been proven to yield useful insights [5]- [7]. In a recent study on multi-hop D2D [7], where BSs, CC UEs, and D2D UEs all conform to spatial Poisson Point Processes (PPPs) of different densities, it was found that statistically D2D sharing the uplink (UL) band performs much better than D2D sharing the downlink (DL) band in terms of outage probability.…”

Outage Probability for Multi-Hop D2D Communications With Shortest Path Routing

“…The majority of existing analysis is based either on simulation [1]- [3] or simple geometric abstractions [4]. Thus far, stochastic geometry based analysis has only considered a single-hop D2D scenario [5]. The more general scenario of multi-hop D2D with partner selection for routing in a particular direction has been neglected.…”