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In order to solve the problem of ground traffic congestion, many cities in China (such as Beijing) have constructed or are being building up underground subway transportation networks. The ground settlement or even collapse induced by the excavation of subway tunnels is a crucial issue that directly relates to the safety of the citizens and buildings. The ground subsidence is dependent on the stability...
Specific to the maximization of the system throughput, the joint resource allocation schemes for Device-to-Device (D2D) communication are proposed. Another purpose of the joint resource allocation schemes is to avoid the strong interference between cellular communication and the D2D communication. The core strategy of the algorithm is to establish a throughput matrix and find maximum throughput according...
The huge data traffic demand is a challenge for the next generation of wireless network. Since the majority of data is public information, a novel wireless intelligent pushing mechanism is presented by pushing public information in the way of point to multipoint (P2M) in network idle time, using limited spectrum. Analytic Hierarchy Process (AHP) is employed to establish the performance evaluation...
Nowadays, multi-hop communication systems are often applied in power transmission system to transmit surveillance information to control center. In order to transmit surveillance data more efficiently, it is required to design the communication system with low latency and high reliability. This paper provides a novel data transmission framework along with a QoS provisioning multi-hop routing scheme...
A novel single relay selection scheme in cooperative wireless network is provided. Our scheme first chooses a best relay from a set of N available relays and then uses the selected relay to cooperate between the source and destination. The relay selection method was considered both instantaneous channel state information and residual energy information. Specially, cooperation communication will be...
In order to suit high mobility and limited resources of ad hoc networks, a new hybrid routing strategy named Non-Source Non-Certain Routing (NSNCR) is proposed. This paper designs a multi-path judgment method for handling request message in route discovery process. A next hop selecting mechanism used for forwarding packets is proposed, and the mechanism is based on series of collective concepts like...
Ignoring the physical relationship between two peers, traditional structured Peer-to-Peer (P2P) systems, whose peers are arranged in a logical ring according to Distributed Hash Table (DHT), have some defects on delay and bandwidth for physical neighbor peers. We proposed a layered network structure to make full use of the location information of each peer. In this structure, all peers are separated...
Cooperative spectrum sensing can improve sensing capability of the system. But in a system which owns channels of different protection levels, it will bring bad effects to detection performance when using a single sensing algorithm and data fusing rule in different channels of this system. Therefore this paper proposes a cooperative sensing algorithm, which is based on policy database to select different...
In cognitive radio technology, detecting accurately primary users can improve the efficiency of cognitive radio (CR) network and reduce interference with primary users. This paper proposes a communication method of avoiding interference with hidden terminal in CR network. It determines the location and coverage of primary transmitter through the ranging, and then avoids effectively interference with...
Here we proposed a periodical two-stage sensing MAC protocol for the cognitive network which enables the sender sense the same channel with its intended receiver through sensing only two channels at most, thus the sender and receiver don't need to sense a large number of channels to find a channel that is idle to both of them for data transmission. Each secondary user (SU) randomly chooses a channel...
This paper shows a general view of the Multimedia Messaging Service (MMS) in the packet switching network (PSN), such as the technology features, the service flows and the major signaling messages. The Calling Detail Record (CDR) synthesis theory of MMS in PSN is studied in detail. This paper also discusses multi-protocol and multi-interface association technology in signaling monitoring process of...
In this paper we present a MAC protocol for distributed cognitive networks. Secondly users decide which data channel to sense according to current channel usage condition and the possible data transmission opportunities of all the data channels, and then access if the data channel is sensed idle, as a way to improve their data throughput by flexibly adjusting the sensing sequence. In addition, the...
Spectrum selection is crucial in improving the performance of cognitive radio networks. Most of previous work on spectrum selection consider spectrum utilization ratio as system design criteria and ignore the energy issue. In this paper, we take a cross-layer design approach to select the optimal spectrum considering the time varying and stochastic nature of wireless channels. The proposed scheme...
Flue gas desulfurization (FGD) gypsum is a by-product created when sulfur is removed from flue gases in power plants. The utilization of FGD gypsum as a road sub-base for construction purposes is unsatisfactory when compared with other by-products such as fly ash and steel slag. As a result, FGD gypsum has generally been treated as a waste product and landfill. A new type of semi-rigid road sub-base...
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