Mobility management in heterogeneous wireless networks

Assouma, A.D.; Beaubrun, Ronald; Pierre, Samuel

doi:10.1109/jsac.2005.862407

Cited by 26 publications

(5 citation statements)

References 29 publications

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“…In (11), when u = 0, we choose a value m such that T m ¼ mT s is less than 30 ls, then J 0 ð2pf d mT s Þ % 1 and cosð2pf d mT s cos h 0 Þ % 1 even if f d is as high as 500 Hz. In this case, the auto-covariance V jyj 2 jyj 2 ðu ¼ 0; mÞ tends to a constant value irrelevant to f d .…”

Section: A Practical Doppler Estimation Algorithmmentioning

confidence: 99%

“…Doppler spread has been utilized in single carrier systems for adaptive handoff algorithm [9], energy-efficient routing for mobile ad hoc networks [10], mobility and resource management for wireless multimedia networks [11], trajectory prediction for wireless networks with mobile base stations [12]. It has also been used in OFDM-based communication systems for adaptive channel estimation [13,14], adaptive power control [15], and adaptive modulation and coding (AMC) [16].…”

Section: Introductionmentioning

confidence: 99%

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Doppler Spread Estimation for Broadband Wireless OFDM Systems Over Rician Fading Channels

Tao

Xiao

2009

Int J Wireless Inf Networks

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In this paper, we present a new Doppler spread estimation algorithm for broadband wireless orthogonal frequency division multiplexing (OFDM) systems with fast time-varying and frequency-selective Rayleigh or Rician fading channels. The new algorithm is developed by analyzing the statistical properties of the power of the received OFDM signal in the time domain, thus it is not affected by the influence of frequency-domain inter-carrier interference (ICI) introduced by channel variation within one OFDM symbol. The operation of the algorithm doesn't require the knowledge of fading channel coefficients, transmitted data, or signal-to-noise ratio (SNR) at the receiver. It is robust against additive noise, and can provide accurate Doppler spread estimation with SNR as low as 0 dB. Moreover, unlike existing algorithms, the proposed algorithm takes into account the inter-tap correlation of the discrete-time channel representation, as is the case in practical systems. Simulation results demonstrate that this new algorithm can accurately estimate a wide range of Doppler spread with low estimation latency and high computational efficiency.

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Section: A Practical Doppler Estimation Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Doppler Spread Estimation for Broadband Wireless OFDM Systems Over Rician Fading Channels

Tao

Xiao

2009

Int J Wireless Inf Networks

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“…Moreover, the AMC architecture does not provide appropriate handoff decision mechanism to take into account heterogeneity of access networks. Other works have been done for the interworking of heterogeneous 3G cellular networks [7], [8] but not for IP-based wireless networks or different types of access networks technologies. These integration schemes are based on the deployment of a gateway, which takes care of interworking issues, between each pair of networks.…”

Section: Related Workmentioning

confidence: 99%

Reliable Integrated Architecture for Heterogeneous Mobile and Wireless Networks

Makaya

Pierre²

2007

JNW

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The major trend in next-generation or 4G wireless networks (NGWN/4G) is the coexistence of diverse but complementary architectures and wireless access technologies. In this context, an appropriate integration and interworking of existing wireless networks are crucial to allow seamless roaming across those networks. Several integrated architectures have been proposed for 3G cellular networks and wireless local area networks (WLANs) by both third generation wireless initiatives, 3GPP and 3GPP2. However, the proposed architectures have several drawbacks, the most significant being the absence of quality of service (QoS) guarantees, seamless roaming and service continuity. This paper proposes a novel architecture, called Integrated InterSystem Architecture (IISA), which enables the integration and interworking of various wireless networks and hide their heterogeneities from one another. The IISA architecture aims provisioning of guaranteed seamless roaming and service continuity across different access networks. Performance evaluation shows that IISA together with the proposed handoff management scheme provide significant gains than existing interworking architectures and mobility management protocols.

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“…In fact, many research efforts [3,4,5] have shown the superiority of heterogeneous wireless networks in providing flexible network service and better system performance. According to their coverage sizes, four kinds of BSs are defined in LTE (from larger to smaller): macro-cell BS, micro-cell BS, pico-cell BS, and femto-cell BS.…”

Section: Introductionmentioning

confidence: 99%

A Two-Phase Heuristic for Base Station Placement in Long Term Evolution (LTE) Networks with Cell Heterogeneity

Wang

Chuang

2014

Proceedings of the 12th International Conference on Advances in Mobile Computing and Multimedia

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In cellular networks, base station placement is a critical issue because it determines the construction cost and service quality. Existing placement approaches for 2G and 3G networks usually consider homogeneous base stations, where they have similar coverage areas and hardware features. Recently, the burgeoning LTE technology allows different types of base stations to collaboratively provide service in the same network. This characteristic motivates us to address the problem of placing heterogeneous base stations to serve user devices such that the overall cost is minimized while user demands are stratified. The problem is NP-hard, and thus we develop an efficient two-phase heuristic which first employs a geometric idea to provide coverage to all user devices and then adjusts the cell range to meet the power and bandwidth constraints of each base station. Experimental results show that our two-phase heuristic can reduce the construction cost and energy consumption of base stations.

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Mobility management in heterogeneous wireless networks

Cited by 26 publications

References 29 publications

Doppler Spread Estimation for Broadband Wireless OFDM Systems Over Rician Fading Channels

Doppler Spread Estimation for Broadband Wireless OFDM Systems Over Rician Fading Channels

Reliable Integrated Architecture for Heterogeneous Mobile and Wireless Networks

A Two-Phase Heuristic for Base Station Placement in Long Term Evolution (LTE) Networks with Cell Heterogeneity

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