Energy-Efficient Flexible Inter-Frequency Scanning Mechanism for Enhanced Small Cell Discovery

Prasad, Athul; Lundén, Petteri; Tirkkonen, Olav; Wijting, Carl

doi:10.1109/vtcspring.2013.6692547

“…Knowledge of UE mobility can also be very beneficial to transmission scheduling [2], mobility load balancing [3], channel quality indicator (CQI) feedback enhancement [4], energy efficiency [5], and many resource management scenarios. Choosing either frequency selective scheduling (FSS) or frequency diversity scheduling (FDS) for LTE, could depend on the user speed as FSS shall be preferred for low speed UEs and FDS for high speed UEs.…”

Section: Introductionmentioning

confidence: 99%

Online mobile user speed estimation: Performance and tradeoff considerations

Haddad

¹

,

Herculea

²

,

Chen

³

et al. 2017

2017 14th IEEE Annual Consumer Communications &Amp; Networking Conference (CCNC)

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“…low scanning frequency) can lead to the UT missing small cell offloading opportunity, thus resulting in a potential decrease in capacity. Most prior work on ISCD in literature have focused only on the effect of ISCD periodicity on scanning power without evaluating the impact of UT transmit power reduction when offloading to the small cells [10]- [12], [14]. In [14], a mobility aware handover scheme for HetNets consisting of WiMAX and WiFi networks was proposed.…”

Section: Introductionmentioning

confidence: 99%

Energy Efficient Inter-Frequency Small Cell Discovery in Heterogeneous Networks

Onireti

¹

,

Imran

²

,

Imran

³

et al. 2016

IEEE Trans. Veh. Technol.

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In this paper, using stochastic geometry, we investigate the average energy efficiency (AEE) of the user terminal (UT) in the uplink of a two-tier heterogeneous network (HetNet), where the two tiers are operated on separate carrier frequencies. In such a deployment, a typical UT must periodically perform inter-frequency small cell discovery (ISCD) process in order to discover small cells in its neighborhood and benefit from the high data rate and traffic offloading opportunity that small cells present. We assume that the base stations (BSs) of each tier and UTs are randomly located and we derive the average ergodic rate and UT power consumption, which are later used for our AEE evaluation. The AEE incorporates the percentage of time a typical UT missed small cell offloading opportunity as a result of the periodicity of the ISCD process. In addition to this, the additional power consumed by the UT due to the ISCD measurement is also included. Moreover, we derive the optimal ISCD periodicity based on the UT's average energy consumption (AEC) and AEE. Our results reveal that ISCD periodicity must be selected with the objective of either minimizing UT's AEC or maximizing UT's AEE. Index TermsHeterogeneous cellular network, stochastic geometry, fractional power control, small cell discovery, energy efficiency.

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“…Various inter-frequency small cell discovery (ISCD) mechanisms have been studied in literature. Some of the proposed solutions for enhancing ISCD include: UT speed based measurement triggering [10], [11], relaxed inter-frequency measurement gap [12], proximity based ISCD [11], small cell signal based control measurement and small cell discovery signal in macro layer [3], [13].…”

Section: Introductionmentioning

confidence: 99%

“…The ideal AEE is based on an ideal UT association, where the UT associates with the BS (small or macro cell) with the maximum biased received power [6], [22], [26], [27]. On the other hand, the realistic AEE is based on a realistic UT association, where UT association with the small cell is also dependent on the periodicity of the ISCD [11], [12], [15]. In Section VI, we first utilize a polynomial fitting method to approximate the percentage of time the typical UT missed small cell offloading opportunity as a function of ISCD periodicity, for a fixed UT speed and small cell density.…”

Section: Introductionmentioning

confidence: 99%

On energy efficient inter-frequency small cell discovery in heterogeneous networks

Onireti

¹

,

Imran

²

,

Imran

³

et al. 2015

2015 IEEE International Conference on Communications (ICC)

View full text Add to dashboard Cite

In this paper, using stochastic geometry, we investigate the average energy efficiency (AEE) of the user terminal (UT) in the uplink of a two-tier heterogeneous network (HetNet), where the two tiers are operated on separate carrier frequencies. In such a deployment, a typical UT must periodically perform inter-frequency small cell discovery (ISCD) process in order to discover small cells in its neighborhood and benefit from the high data rate and traffic offloading opportunity that small cells present. We assume that the base stations (BSs) of each tier and UTs are randomly located and we derive the average ergodic rate and UT power consumption, which are later used for our AEE evaluation. The AEE incorporates the percentage of time a typical UT missed small cell offloading opportunity as a result of the periodicity of the ISCD process. In addition to this, the additional power consumed by the UT due to the ISCD measurement is also included. Moreover, we derive the optimal ISCD periodicity based on the UT's average energy consumption (AEC) and AEE. Our results reveal that ISCD periodicity must be selected with the objective of either minimizing UT's AEC or maximizing UT's AEE. Index TermsHeterogeneous cellular network, stochastic geometry, fractional power control, small cell discovery, energy efficiency.

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Energy-Efficient Flexible Inter-Frequency Scanning Mechanism for Enhanced Small Cell Discovery

Cited by 14 publications

References 8 publications

Online mobile user speed estimation: Performance and tradeoff considerations

Online mobile user speed estimation: Performance and tradeoff considerations

Energy Efficient Inter-Frequency Small Cell Discovery in Heterogeneous Networks

On energy efficient inter-frequency small cell discovery in heterogeneous networks

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