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Reusing the frequency resources has long been a desirable practice in most licensed wireless networks. In future, frequency reuse will be enabled by advanced technologies like device-to-device (D2D) communication which will allow eNB-free data exchange between end devices. However, the first challenge for devices to establish D2D links will be to ”discover” each other in a distributed manner. Even...
Offloading users from an overloaded macro base station (BS) to a lightly loaded small cell BS is critical to alleviate the congestion of the macro BSs. However to overcome the signal-to-interference-plus-noise ratio (SINR) degradation of the offloaded users, offloading should be done in conjunction with an efficient interference management technique. Strict fractional frequency reuse (Strict-FFR)...
Time-domain enhanced inter-cell interference coordination (eICIC) scheme using almost blank sub-frames (ABS) is one of the key technologies in Heterogeneous networks (Het-net). Static configuration of ABS has been proven to increase performance but the optimal ABS ratio is yet to be examined. Moreover, combing Coordinated Multi-Point transmission (CoMP), ABS could be more efficiency. This paper proposes...
Device-to-Device (D2D) communication has been recently devised as a new paradigm that boosts spectrum reuse inside a cell, leading to enhanced quality of service and user experience. The design of proper D2D resource allocation schemes, which constitute the enablers towards this direction, is an open challenge. In this paper, we propose a D2D resource allocator based on the Ant Colony Optimization...
This paper investigates the resource allocation schemes for Voice over Internet Protocol (VoIP) traffic under high speed train scenario, in which 2-state VoIP traffic model based on Markov chain is considered. Unlike the full-buffer traffic, in which the transmitter buffer is always full of data to be transmitted, VoIP traffic can be characterized by small packets in regular intervals with tight delay...
With increasing number of autonomous heterogeneous devices in future mobile networks, an efficient resource allocation scheme is required to maximize network throughput and achieve higher spectral efficiency. In this paper, performance of network-integrated device-to-device (D2D) communication is investigated where D2D traffic is carried through relay nodes. An optimization problem is formulated for...
Orthogonal frequency division multiplexing (OFDM) has been adopted as a promising technique to mitigate multi-path fading and provides high spectral efficiency in broadband communications. In this paper, we investigate resource allocation and sub-carrier permutation in OFDM-based hybrid relay protocol over frequency-selective channels. Selective multicarrier-adaptive hybrid relay protocol (MC-AHRP),...
The concept of cognitive radio (CR) is proposed to deal with the problem that the spectrum resource is almost used up but some licensed bands are under very low utilization at the same time. In CR networks, secondary users (SUs) are allowed to utilize the licensed spectrum bands by paying to the primary users (PUs) with the spectrum licenses. Besides, with the rapid development of wireless communications...
In the cellular network, Device-to-Device (D2D) communication is considered to be a promising resource reuse strategy, which can enable local service opportunities and reduce system load for short-range communication. In order to suppress the interference from D2D users, the scheduler should allocate resources and select communication mode appropriately. In this paper, we analyze the constraints and...
In this paper, two algorithms in resource allocation with fractional power control scheme are proposed and evaluated. In these algorithms, we joint chunk allocation and unequal power allocation in one chunk by considering fractional power control scheme as power constraint on each user to improve the sum of spectral efficiency of users and fairness among users. In order to evaluate our proposed algorithms,...
The next generation of wireless networks (4G) will use OFDMA (Orthogonal Frequency Division Multiple Access) in the reverse link. In OFDMA, the reverse link resources assigned to a user are called tiles each of which consists of a subset of consecutive subcarriers. Since at most one user is assigned to each of these tiles then reverse link transmissions within a sector are orthogonal. However, the...
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