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The high demand of bandwidth from multimedia applications, specially video applications which consume the great majority of the Internet bandwidth, has caused a challenge for service providers and network operators. On the one hand, the allocation of bandwidth in a fair manner for multimedia users is necessary, so that the total utility of all users is maximized for higher quality of experience. On...
We consider data intensive cloud-based stream analytics where data transmission through the underlying communication network is the cause of the performance bottleneck. Two key inter-related problems are investigated: task placement and bandwidth allocation. We seek to answer the following questions. How does task placement make impact on the application-level throughput? Does a careful bandwidth...
Cognitive radio (CR) is an effective way to improve the utilization of spectrum resource. This paper focuses on the resource allocation in cooperative relay cognitive radio networks and proposes an optimized resource allocation algorithm. In the algorithm, when the channel between the primary source and destination is good, the primary user (PU) selects a best sub-channel to transmit its data directly,...
A cognitive vehicle network is date from Vehicular Ad hoc Networks (VANET), which is proposed to solve the problem of control channel and spectrum scarcity in VANET. To resolve channel conflict problem in channel switching in vehicle network, a new dynamic spectrum allocation algorithm (DSAARCC) is proposed. When the vehicle user chooses the channel, to minimize the average delay under the condition...
Memory interference is a critical impediment to system performance in CMP systems. To address this problem, we first propose a Dynamically Proportional Bandwidth Throttling policy (DPBT), which dynamically throttles back memory-intensive applications based on their memory access behavior. DPBT achieves a more balance memory bandwidth partitioning. Moreover, we improve the previous memory channel partitioning...
This paper presents a mobility-aware channel allocation strategy for clustered ad hoc network. Our main novelty is to consider the mobility associated with the number of times that the channel with larger spectral distance is allocated to guide the channel allocation process, while quickly responding to changes in the network topology. In our performance evaluation, we use a realistic mobility model...
The key challenges of high-throughput data delivery in multi-radio multi-channel Wireless Mesh Networks (WMNs) are fluctuating channel conditions, dynamic traffic flows, co-channel interferences, congestion, etc. In this paper, we first formulate a mixed integer non-linear programming (MINLP) optimization framework that chooses, at each router, a number of outgoing link-channel pairs and allocates...
Wireless Body Area Network (WBAN) assists in monitoring of the health conditions of a patient. The monitored data of a patient require diverse QoS and need to be delivered to the coordinator without delay and packet loss. In this context, this paper proposes a MAC Superframe structure which allocates channels based on the severities of the detected data of a patient and transmit immediately without...
Cooperative forwarding has shown a substantial network performance improvement compared to traditional routing in multi-hop wireless networks. To further enhance the system throughput, especially in the presence of highly congested multiple cross traffic flows, a promising way is to incorporate the multi-radio multi-channel (MRMC) capability into cooperative forwarding. However, it has been said that...
The rapid growth in the number and variety of connected devices requires 5G wireless systems to cope with a very heterogeneous traffic mix. As a consequence, the use of a fixed transmission time interval (TTI) during transmission is not necessarily the most efficacious method when heterogeneous traffic types need to be simultaneously serviced. This work analyzes the benefits of scheduling based on...
With rapid development in wireless applications, there arises a demand for available spectrum. Cognitive radio technology is a promising solution to enhance the spectrum utilization by enabling unlicensed users to exploit the spectrum in an opportunistic manner. Since unlicensed users are temporary visitors to the licensed spectrum, they are required to vacate the spectrum when a licensed user reclaims...
Multipath transport can simultaneously utilize many interfaces of a terminal to maximize the transfer throughput. However, when sharing the same bottleneck link with single-path flows, the multipath flows will occupy more network bandwidth and it will lead to the unfairness of resource allocation. In this paper, we propose a Congestion Control method with Fairness (CCMF) for multipath transport. CCMF...
Increasing the density of access points (APs) is often required to improve the coverage and capacity of wireless local area network (WLAN). But such high density deployment may result increased interference and hence poor network performance. The channel assignment problem under this type of highly interfering environment is a challenging task. Every link may not be activated due to the limitation...
A data gathering protocol for multi-channel wireless sensor network is proposed in this paper. The sensor field is logically divided into some finite number of grids. Each grid is managed by a potential node called as grid manager. Each grid manager is also responsible for communicating aggregated data generated inside the respective grid to the base station either directly or via multi-hop communication...
The efficient allocation of multi-interface multi-channel Wireless Mesh Network channel resources is a hot topic recently. Effective channel management mechanisms need to be designed to ensure the full and efficient use of channel resources. In this paper, combined with the channel load that network buyers perceived, the channel reassignment problem of multi-interface multi-channel Wireless Mesh Network...
This article presents a user behavior aware channel allocation scheme for mobile ad hoc networks. The proposed scheme uses a distributed approach to dynamically allocate the IEEE 802.11b/g spectrum. Our main contribution is to consider the user behavior, represented by the mobility, traffic, and node degree to guide the channel allocation process. In addition, we use a mobility model based on the...
We tackle the challenging problem of link scheduling and channel assignment in multi-channel, multi-hop wireless networks, aiming to achieve high network throughput. We adopt the signed graph spectral clustering algorithm to solve this problem heuristically, by jointly considering channel gain and mutual interference. The basic idea is to cluster links with smaller mutual interference and allocate...
This paper presents a multichannel assignment problem in a centralized cognitive radio sensor network (CRSN). The basic aim of this problem is to maximize the overall system throughput and minimize the overall energy consumption of the CRSN. First, a weighted sum based optimization problem is formulated. Then the problem is represented using bipartite graph and solved using matching based hungarian...
Previously, we proposed the active access-point (AP) configuration algorithm for elastic Wireless Local-Area Network (WLAN) systems using heterogeneous APs. This algorithm activates or deactivates APs depending on traffic demands, assuming that any active AP can use a different channel to avoid interferences among APs. However, the number of non-interfered channels in IEEE 802.11 protocols is limited...
Although many works exist on the subject, the real impact of partially-overlapping channels (POCs) on the capacity of multi-radio wireless mesh networks is not clearly established yet. In this paper, we propose a mathematical programming model to evaluate accurately the improvement in throughput that could be achieved if all the adjacent radio channels were exploited. Compared to previous works, our...
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