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Recently, two types of coordinated multiple point transmission (CoMP) technologies - joint processing and transmission (JPT) and coordinated scheduling and beamforming(CSB) - have been proposed to the latest cellular communication standard named as a Network MIMO, to improve the performance of cell-edge users who suffer strong ICI. In this paper, we investigate an ICI cancelation employing a user...
In cellular networks, mobile users in hot cells may suffer from low throughput due to the load imbalance problem. Different approaches such as channel borrowing and cell breathing have been proposed to accommodate this problem. Meanwhile, relay stations, which can extend cell coverage and enhance signal strength for boundary users, appear to be important components in next generation networks. In...
Cellular networks operating with a frequency reuse factor of one are often interference-limited. For that reason, base station (BS) cooperation techniques aiming at mitigating the effects of interference caused by simultaneous transmissions on the same frequency resources in nearby sectors may considerably improve the system performance. However, for that purpose generally high-capacity backhaul links...
Multi-site MIMO (Multiple Input Multiple Output) is a key technology that will enable next generation cellular networks to achieve high throughput in cell-edge areas. However, a multi-site single-user MIMO system is subject to performance degradation in terms of overall system throughput due to the expense of additional assignments of radio resources to cell edge user equipment. This paper presents...
In this paper, the throughput performance of uplink Base Station (BS) cooperation in a realistic multi-cell MIMO system is evaluated. We choose LTE Release 8 as our baseline, and propose a whole implementation scheme for uplink BS cooperation. First we propose a dynamic cooperative BS selection algorithm, in which each cell-edge user will be assigned a potential cooperative BS by comparing the reception...
We propose a call admission control scheme for soft handoff of CDMA networks based on mobility estimation and mobility history of mobile stations. This work is further improvement of the Eliminating Pseudo Handoff Call (EPHC) proposed by Xiaomin Ma et.al. Therefore we named our proposed scheme as Improved EPHC (IEPHC). The proposed scheme not only improves network throughput but also reduces handoff...
In the recent years, the WiMAX cellular system has been greatly deployed worldwide as it can provide high data rate to mobile subscribers. However, a few works has been done to characterize the behavior of the WiMAX network in different deployment scenarios. In this paper, we investigate the performance of the WiMAX system in various morphological scenarios, namely, dense urban, urban, and sub-urban...
Since the using of OFDM in LTE system eliminates the inter-channel interference within cells, inter-cell interference has become the major influence factor of inter-cell resource allocation. Besides, with the increase of types of traffics, different QoS should be provided for different quality of services. A modified algorithm is proposed to ensure multi-traffic QoS by using rate conversion in allocation...
The opportunistic beamforming (OB) technique in multicellular OFDMA networks is investigated in this paper. For this reason, three cross-layer radio resource management (RRM) algorithms for OFDMA operational scenarios that are based on typical resource allocation targets such as minimization of transmit power, maximization of throughput and interference averaging are considered. The OB concept is...
It is expected that Device-to-Device (D2D) communication is allowed to underlay future cellular networks such as IMT-Advanced for spectrum efficiency. However, by reusing the uplink spectrums with the cellular system, the interference to D2D users has to be addressed to maximize the overall system performance. In this paper, a novel method to deal with the resource allocation and interference avoidance...
In this paper we present simulation results to demonstrate that a simple distributed intra frequency load balancing algorithm based on automatic adjustment of handover thresholds can significantly reduce the call blocking rate and increase cell-edge throughput in an LTE network.
In fourth generation wireless communication standards, the throughput enhancement for cell edge users is a main issue so that various inter-cell interference (ICI) coordination techniques have been suggested. Since the coordination between different cells requires the resources of cooperating cell, its use should be determined carefully. In this paper, we consider two basic handover schemes (Fast...
This paper analyzes the problem of allocating power and subchannels in the downlink of a multi-cell, full-reuse OFDMA cellular system. We propose a distributed iterative algorithm, in which the allocation is performed independently in each cell, by maximizing the cell rate subject to a power constraint. The algorithm restricts the set of users that can be allocated on each subchannel, in order to...
With Network Coding, a source can multicast information at a rate approaching the smallest minimum cut between the source and any terminal through encoding the incoming packets at intermediate node. On the other hand, in current wireless systems, terminals could receive multiple cells signal, but only registered cell's packets could be used, and others are dropped as useless or noise. This traditional...
It is undesired to drop an ongoing call in wireless systems; however, call dropping may occur in two situations, one of which is hand-off between cells in cellular wireless networks, the other of which is channel withdrawal in wireless systems with spectrum leasing. Channel reservation is a common solution to reduce the two types of call dropping. Optimal numbers of reservation channels were separately...
In this paper, we study the dynamic uplink power allocation problem in a multi-cell multi-user CDMA-based cellular cognitive radio (CR) system, in which the concept of hierarchical interference bound is introduced to describe the coexistence of the multi-user interference. We propose a novel differential game-based dynamic power allocation model via two formulated cost functions. Furthermore, we present...
This paper presents a protocol designed as an alternative to classical TCP for channels which experience high loss-rates. The protocol is simplified with respect to TCP by eliminating the need of retransmissions and the associated buffers. This is achieved by applying a rateless erasure correcting code to the data that is going to be transferred. A modified version of the TCP congestion control algorithms...
Theoretical analysis of base station cooperation methods have proven their potential for solving interference limitation in today's cellular networks by showing immense capacity and fairness gains. However, a major downside of base station cooperation is the additional information exchanged amongst base stations which has been the motivation for recent work on backhaul efficient cooperation schemes...
Performance analysis of data services is studied in CDMA network by incorporating Low Density Parity Check (LDPC) codes in presence of soft handoff. This scheme is found to enhance throughput and reduce delay and packet error rate significantly. A stop and wait ARQ has been assumed. Both the cases of coded and un-coded data transmission are investigated.
This paper focuses on multi-user scheduling in downlink relay-aided cellular network. Based on conventional scheduling rules (Round Robin (RR), Max Carrier-to-Interference ratio (Max C/I), and Proportional Fair (PF)), we propose backhaul and access scheduling algorithms under centralized and distributed mechanism, respectively. We evaluate and compare the network performance through system-level simulation...
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