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Device-to-Device (D2D) communication appears to be a promising component in 5G networks because of its increased spectral efficiency and reduced communication delay. But it also causes the co-channel interference to cellular networks. In this paper, we propose a new power control and resource scheduling scheme by taking into account the fairness, quality-of-service (QoS) requirements to deal with...
As a significant step for vertical handover, optimal decision for network selection has been attracting high and sustaining attention over the past decade, especially on the topic of meeting user's rapidly increased requirements. However, the instability of the basic decisive parameters is ignored in most of the investigations, which might finally lead to a high misjudgement ratio. Therefore, great...
With the growing communication requirements of users, integration of various kinds of networks has become an inevitable trend. However, it is still a problem how to guarantee the QoS requirements, measure the performances of each sub-network, while making a reasonable network selection. In order to solve this problem, a SNR-based access algorithm in CDMA/WLAN heterogeneous networks is proposed, by...
The increasing demand for indoor location based services has motivated the development of various indoor positioning methods. Among them, fingerprinting based positioning system in wireless local area network (WLAN) has been paid more attentions due to its cost effectiveness and relatively high accuracy. This paper investigates various optimization techniques for WLAN fingerprinting positioning comprehensively...
Wireless local network (WLAN) is developing to a ubiquitous technique in our daily life recently. As a related product, WLAN based indoor positioning system is getting more and more attention. Fingerprint is a mainstream method of wireless indoor positioning, but it has the shortcomings of that received signal strength (RSS) is multi-modal and sensitive to environmental factors. These characters would...
At present a lot of heterogeneous wireless access selection algorithms are presented in published literatures. However, none of them takes competition in resources between users into account. In order to solve this problem, a wireless network access selection algorithm is proposed using non-cooperative game theory. First, a actual data rate of user is calculated using the quality of the received radio...
The effect of topology changing caused by nodes mobility on too much overhead occupying the limited bandwidth and resource has been greatly alleviated by a routing timer self-adaptive regulating (RTSAR) algorithm based on MIMD loop control proposed for mobile ad hoc network in this paper. Served as a stable HELLO message broadcasting algorithm, RTSAR has been designed on a fairly converging mathematical...
This paper proposed an accuracy enhancement for fingerprint-based WLAN indoor probability positioning algorithm. Based on Bayes' probability theory, the traditional probability positioning algorithm converts the new sample location coordinates corresponding to the posterior probability to a priori marginal probability, which leads to the reference point having the greatest product for the estimated...
The negative impact of network partitions on the availability of key management services in Wireless Local Area Network (WLAN) is alleviated by a robust key management scheme based on the distributed certificate authority (DCA). Auxiliary shares are used to increase the redundancy of shares in the networks thereby ensuring robustness and security at the same time. Simulations show that the average...
Based on the research of spatial traffic distribution model in urban areas, this paper presents a novel urban spatial Dynamic Spectrum Allocation (DSA) according to the characteristics of spatial spectrum demand distribution in urban areas. A dynamic DSA area division method is investigated, which sets up a new neighboring relationship among the DSA areas. So part of the available spectrum is released...
A scheme of the real-time memory database data organization based on Red-Black tree is presented and the performance is compared with other structure used in the real-time database referring to the practical application in the paper. According to the theory analysis and experiment, it is shown that the method has great superiority on inserting and deleting the magnanimous data.
Indoor position determination based on artificial neural network (ANN) with area correlation is proposed in this paper. For any pattern matching based algorithm in WLAN environment, the characteristics of received signal strength (RSS) or signal to noise ratio (SNR) to multiple access points (APs) are utilized to establish radio map in the off-line phase, and in the online phase, the actual two or...
Impact of nodes dynamically, randomly, frequently entering and leaving network on unreliable routing connection has been clearly described by a generalized routing reliability model according to measuring parameters of relative performance by studying on two-hop unit model presented in this paper. A new rate expression of node entering/leaving spindle region beta has been established by analyzing...
WLAN hybrid indoor location method based on fuzzy c-mean clustering (FCM) and artificial neural network (ANN) is proposed in this paper. For any pattern matching based algorithm in WLAN environment, characteristics of received signal strength (RSS) or signal to noise ratio (SNR) to multiple access points (APs) are utilized to establish radio map in the off-line phase, and in the on-line phase, actual...
Although Rate control algorithm of TM5 model on MPEG-2 is early classical algorithm, which is able to control rate and complexity lower than Hol7, this algorithm has some insufficiency. This paper analyses rate control algorithm on TM5, Using "virtual buffer" for reference, propose a rate control improved algorithm, which can efficiently control rate, without updating MAD prediction model...
In this paper, the factors which affect the positioning accuracy in WLAN environment have been discussed in off-line phase for fingerprint technology, including different time intervals, directions, temperature and dynamic environment. Firstly, some of the significant positioning technologies are introduced and also the basic design process of fingerprint method is proposed. Then, based on the experimental...
Joint Radio Resource Management (JRRM) and Dynamic Spectrum Allocation (DSA) are both promising approaches in the heterogeneous networks to increase overall QoS and spectrum efficiency, which have already been taken into the framework of heterogeneous radio access networks of E2R. However, not much research has been done about how they could work together properly. In our opinion, JRRM should act...
Base station cooperation can mitigate interference of other cell in the uplink, in this paper future base stations cooperation architecture and information exchange scheme are proposed, receiver based on base station cooperation is designed, each station detected the weak signal information of users, which are transmitted to cooperative base station to combine and send demodulated signal to local...
Combining with UWB location technology, TOA location algorithm is presented. The first step is statistically averaging the received signals to mitigate impact of AWGN as long as possible. Using incoherent power detection algorithm obtain rude TOA estimation which is made incoherent power detection once more in the second step so as to further optimize in time. The simulation results show that the...
In this paper, we propose a novel cross-layer scheme for packet fast forward protocol in mobile ad hoc networks called the PFFMAC (packet fast forward MAC) protocol. PFFMAC is a cross-layer solution in which the MAC layer chooses different packet forward processes according to the routing table by estimating middle nodes. In PFFMAC, packet forward process in MAC layer is dynamically adjusted from...
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