Shrinking the reuse distance: Spectrally-efficient radio resource management in D2D-enabled cellular networks with Interference Alignment

Abstract

Abstract-Enabling underlay direct Device-to-Device (D2D) communication mode in future cellular networks has good potential for spectrally-efficient and low-latency support of local media services. Recently, it has become evident that shrinking the reuse distance over which wireless resources are reused is a key enabler for achieving high spectral efficiency. Moreover, Interference Alignment (IA) based transmission can enhance the capacity of a wireless network by providing more degrees of freedom. In this work, we exploit clustering of D2D users, frequency reuse over clusters and then using IA to enhance the sum rate. Specifically, we show that in a D2D environment, it is possible to achieve significant gains in attainable rates by constructing clusters of D2D pairs and reuse the available radio resources over the clusters. Moreover, within a cluster, it is possible to further enhance the spectral efficiency by constructing small-sized groups of D2D pairs over which IA is applied to offer additional degrees of freedom. We show that resource reuse over the clusters offer overall rate increase proportional to the number of formed clusters. In addition, interference alignment offers up to 33% increase in the overall rates in the high transmission power regimes compared to the normal Point-toPoint (P2P) communication.

Improving cellular downlink throughput by multi-hop relay-assisted outband D2D communications

“…Focusing on the problems of D2D clustering, the authors in [13] propose a cluster-based scheme over D2D users to reuse spectrum resource. Meanwhile, by using an interference alignment (IA) transmission mode within small scale clusters, D2D users could transmit its data in higher spectrum efficiency.…”

“…In order to prevent the throughput of WiFi links from becoming the throughput bottleneck of transmission path, we adopt the scope computed by formula (13) to limit the selecting scope of potential relays. First of all, we select the two optimal potential relays (lines 9 to 17), then estimate the value of RIE i by formula (14) and compare with the given RIE th .…”

In-Band Device-to-Device Communication in OFDMA Cellular Networks: A Survey and Challenges

“…Similarly, in [100], the IA technique is exploited together with a clustering of the DUEs to achieve even tighter reuse of radio resources than in [99]. The main idea of the paper is first to group DUEs in several clusters within one cell (see Fig.…”

“…The most common method uses an RRA technique increasing spatial reuse for D2D pairs [33] [96]. Another effective means to improve spectral efficiency of the system is to use the IA technique described in [99] or to combine IA and clustering principles to shrink reuse distance of D2D pairs even more [100].…”

Joint Optimization of Transmission-Order Selection and Channel Allocation for Bidirectional Wireless Links—Part II: Algorithms

“…The authors in [29] show how the D2D can be implemented in 3GPP LTEAdvanced networks in details. The advantages of the D2D communications underlaying cellular radio networks are as follows: reducing the minimum co-channel reuse distances within the same cell and thus improving spectral efficiency in terms of [b/Hz/km2] (see, e.g., [40], [41], [52]), reduction of transmit power requirements, and thus improving battery life, e.g., [2], [5]- [8], [10], [16], [27], [39], [43], providing more efficient radio resource use because D2D communications requires only half the amount of resources compared to communication through the BS (e.g., [5], [7], [10]- [13]), reducing the interference in the cellular network e.g., [2], [4], [7], [19], providing infrastructure off-loading (i.e., reduces the loading of the network) in enterprise, campus, stadium, metro, shopping malls, airports, home environments, etc. [3], [32], [33], increasing the bit rate compared to cellular link due to enhanced channel characteristics ( [5], [12]), increasing communication throughput of D2D as compared to the cellular transmission (e.g., [2], [32], [39], [40], [42]), increasing network efficiency and thus supporting more services, including today's "hot" social networking applications like facebook, youtube or myspace [26], improving network performance in shadow fading [7], [9], improving performance of delay-sensitive applications [12], [32], bringing the mobile operator some further revenue [2]…”