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There will be a great of Heterogeneous networks in Next Generation Network. Mobile Satellite system (MSS), great supplement of terrestrial network, provide large scale network coverage and is able to support IP multimedia services. We propose a SIP-based soft handoff scheme for integrated architecture of MSS and UMTS, as well as add satellite access gateway (SAG) in satellite station and terrestrial...
Load balance is a key technology in future heterogeneous wireless networks due to its merits like improving resource utilization, enlarging system capacity and providing QoS for users. This paper presents a load balancing scheme which is composed of QoS-based and load-related admission control and dynamic vertical handover. The scheme can provide better QoS and jointly optimize resource utilization...
The mobility and flexible configuration features of mobile multimedia systems make it an important mean for power system communication. Especially, the mobile video conference can acquire the important on-the-spot information rapidly, and can bring great convenience for power production. This paper analyzed the next-generation broadband wireless communications technology such as 3G, 4G, and video...
Mobility in a wireless heterogeneous scenario in which the mobile devices are able to connect to more than one access technology available in their vicinity requires a re-consideration on the access network reselection mechanisms. The present paper describes and evaluates the opportunity of introducing novel access reselection procedures which enable a network provider to optimize the allocation of...
With the advances of multiple input multiple output (MIMO) technology as one of IMT-Advanced features, it has become feasible to adopt the technology into the mobile location scenario. By exploiting the multipath characteristics of the MIMO system, it is possible to estimate the position of mobile stations (MS) by considering the capability of MIMO to mitigate the non line of sight (NLOS) conditions...
In this paper, the mainly used packet scheduling algorithms in wireless communication system will be introduced. The 3rd Generation partnership long term evolution (3GPP LTE) will provide QoS guaranteed multimedia services which demand much higher downlink packet rate and lower HOL packet delay. So, a suitable packet scheduling algorithm is becoming more and more important in 3GPP LTE system. The...
This paper presents an analytical model of the DRX mechanism in 3GPP LTE. A known method based on a semi-Markov process is used to model the LTE DRX but new simple and exact formulae relevant to the evaluation of the power saving efficiency are developed. The performance of the DRX mechanism with bursty packet data traffic and especially the effects of different DRX parameters on the power saving...
In this paper, a generalized model is proposed to analyze the impact of propagation environment and velocity on the handover performance of user equipment (UE) for long term evolution (LTE) systems. An adaptive time window is defined within the generalized model, to provide additional flexibility to perform handover procedure over conventional reference signal received power (RSRP) and reference signal...
Video smoothing techniques can be used to facilitate more effective transmission and to preserve better video quality. In this paper we develop a semi-optimal video smoothing approach to manage the transmission rates of MPEG-4 and H.264 video over a QoS-based wireless LTE network. The proposed technique utilizes a smoothing buffer with pre-defined thresholds to smooth the transmission rates while...
In the cellular wireless location, the presence of Non Light of Sight (NLOS) declined the location performance dramatically. To overcome the impact of NLOS on mobile positioning, a mobile positioning method based on biased Kalman filter and TDOA data reconstruction is presented in this paper. According to NLOS error distribution feature, NLOS smoothing of measurements and data reconstruction are accomplished...
As two most popular wireless networks, the third generation (3G) cellular networks and wireless local area networks (WLANs) can be integrated to enhance service provisioning. However, most of the previous studies on cellular/WLAN interworking focus on WLANs in a static indoor environment such as offices, hotels, and cafes. Actually, the two heterogeneous technologies can be integrated to support mobile...
The 3GPP Long Term Evolution (LTE) systems have been designed to deliver higher peak data rates, higher capacity and lower air-interface latency compared to prior 2G and 3G systems. This high performance will make it possible to support more demanding applications beyond web browsing and voice, which will require higher data rates and QoS guarantees. Video services are becoming very popular over the...
Existing transmission control protocol (TCP) and TCP-Friendly flows suffer from unpredictable losses and delay over wireless links because such factors may cause sending rate throttling and lower the reactivity of transmission control. This paper presents a cross-layer approach to adapt TCP-Friendly rate control (TFRC) to these two factors of 3-rd generation (3G) wireless links. For effective adaptation,...
In W-CDMA (Wideband Code Division Multiple Access)/UMTS (Universal Mobile Telecommunications System), multiuser contention brought by packet scheduling in MAC-layer causes the issue that effectiveness requirements and fairness requirements for TCP in transport-layer are difficult to be guaranteed simultaneously. In order to solve this problem, we propose a novel scheme CL-AACS (active ACK control...
This paper presents alternative solutions for protocol and distributed control of MM-MAN (Mobile Multimedia Metropolitan Area Network), and evaluates delay in handover and packet loss. MM-MAN is assumed to be a component network of future mobile networks when multimedia communications become popular in the mobile network. Multimedia traffic cannot be handled only with macro-cellular networks, though...
The advanced wireless technologies make vehicle-to-vehicle communication possible. However, vehicular network has a limitation in terms of network topology rapidly change, which causes discontinuous connection. To support seamless connection, horizontal and vertical handovers are required. The good handover mechanism should take network parameters, user requirements, and application QoS into account...
This paper investigates the performance of well known packet scheduling algorithms developed for single carrier wireless systems from a real time video streaming perspective. The performance evaluation is conducted using the downlink third generation partnership project long term evolution (3GPP LTE) system as the simulation platform. This paper contributes to the identification of a suitable packet...
High packet loss rate and wide fluctuations of RTT result in poor TCP communication quality. This well-known effect was observed again and more seriously on Internet access using 3G cellular phone systems on high-speed bullet trains, such as Shinkansen, resulting from inappropriate TCP retransmissions caused by RTT fluctuation. To improve data transfer efficiency, we must avoid incorrect TCP retransmissions...
This paper investigates the performance of exponential/proportional fair (EXP/PF) and maximum-largest weighted delay first (M-LWDF) scheduling algorithms in the third generation partnership project long term evolution (3GPP LTE) providing packet-switched multimedia services. It, then, identifies a suitable packet scheduling algorithm on a basis of their performance evaluation. The performance evaluation...
With the rapid development of wireless communication, it is an inevitable trend that WLAN as a wireless access mode will integrate with 3GPP system and form the interworking network. How to realize the fast and authentic handover scheme of WLAN-3GPP interworking network becomes one of the focus issues in this field. In view of the weaknesses of existing handover schemes, this paper proposes an improved...
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