Performance analysis of subband-level channel quality indicator feedback scheme of LTE

Donthi, Sushruth N.; Mehta, Neelesh B.

doi:10.1109/ncc.2010.5430218

Cited by 22 publications

(11 citation statements)

References 9 publications

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“…This results in the expression for the average throughput in (20), where the probability that the th UE gets selected given that it fed back the rate…”

Section: Proof Of Resultsmentioning

confidence: 99%

An Accurate Model for EESM and its Application to Analysis of CQI Feedback Schemes and Scheduling in LTE

Donthi

Mehta²

2011

IEEE Trans. Wireless Commun.

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Abstract-The Effective Exponential SNR Mapping (EESM)is an indispensable tool for analyzing and simulating next generation orthogonal frequency division multiplexing (OFDM) based wireless systems. It converts the different gains of multiple subchannels, over which a codeword is transmitted, into a single effective flat-fading gain with the same codeword error rate. It facilitates link adaptation by helping each user to compute an accurate channel quality indicator (CQI), which is fed back to the base station to enable downlink rate adaptation and scheduling. However, the highly non-linear nature of EESM makes a performance analysis of adaptation and scheduling difficult; even the probability distribution of EESM is not known in closed-form. This paper shows that EESM can be accurately modeled as a lognormal random variable when the subchannel gains are Rayleigh distributed. The model is also valid when the subchannel gains are correlated in frequency or space. With some simplifying assumptions, the paper then develops a novel analysis of the performance of LTE's two CQI feedback schemes that use EESM to generate CQI. The comprehensive model and analysis quantify the joint effect of several critical components such as scheduler, multiple antenna mode, CQI feedback scheme, and EESM-based feedback averaging on the overall system throughput.Index Terms-Effective exponential SNR mapping (EESM), long term evolution (LTE), orthogonal frequency division multiplexing (OFDM), channel quality feedback, multiple antenna diversity, frequency-domain scheduling, adaptive modulation and coding, lognormal random variable.

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“…This results in the expression for the average throughput in (20), where the probability that the th UE gets selected given that it fed back the rate…”

Section: Proof Of Resultsmentioning

confidence: 99%

An Accurate Model for EESM and its Application to Analysis of CQI Feedback Schemes and Scheduling in LTE

Donthi

Mehta²

2011

IEEE Trans. Wireless Commun.

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“…3 Typically for resource allocation type 0, a resource block (RB) composed of several consecutive subcarriers is allocated to a user instead of a subcarrier. Nonetheless, since all subcarriers in a RB allocated to a user experience nearly the same channel conditions [17], [18], their corresponding signal, interference powers, and spectral efficiency remain nearly the same and can be summed up to provide spectral efficiency of a user per RB rather than per subcarrier. scheduling on a transmission channel 4 .…”

Section: A Network Modelmentioning

confidence: 99%

“…Channel between a sleeping cell user and active BS (Comparison between the CDF approximation of the received signal power at a sleeping cell user from an active BS given in Eq (18). with the CDF obtained from Monte-Carlo simulations (for R = 500, Y = 50, W = 10, κχ = 2, Θχ = 4).…”

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confidence: 99%

Downlink Performance of Cellular Systems With Base Station Sleeping, User Association, and Scheduling

Tabassum

Siddique

Hossain

et al. 2014

IEEE Trans. Wireless Commun.

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Abstract-Base station (BS) sleeping has emerged as a viable solution to enhance the overall network energy efficiency by inactivating the underutilized BSs. However, it affects the performance of users in sleeping cells depending on their BS association criteria, their channel conditions towards the active BSs, and scheduling criteria and traffic loads at the active BSs. This paper characterizes the performance of cellular systems with BS sleeping by developing a systematic framework to derive the spectral efficiency and outage probability of downlink transmission to the sleeping cell users taking into account the aforementioned factors. In this context, we develop a user association scheme in which a typical user in a sleeping cell selects a BS with Maximum best-case Mean channel Access Probability (MMAP) which is calculated by all active BSs based on their existing traffic loads. We consider both greedy and round-robin schemes at active BSs for scheduling users in a channel. Once the association is performed, the exact access probability for a typical sleeping cell user and the statistics of its received signal and interference powers are derived to evaluate the spectral and energy efficiencies of transmission.

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“…In [3]- [6], full or partial feedback for Channel Quality Indicator (CQI) is used in order to find the best available carriers for each user. In [2], distribution of carriers to users are balanced.…”

Section: Introductionmentioning

confidence: 99%

Selective Periodic Component Carrier Assignment Technique in LTE and LTE-A Systems

Narman

Atiquzzaman

2015

2015 IEEE Global Communications Conference (GLOBECOM)

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Internet usage over mobile devices is on the rise. The bandwidth demand for mobile Internet access is also increasing with the number of mobile users. To answer users' demand, carrier aggregation is proposed in LTE-A system. In carrier aggregation, the best available one or more component carriers of each band are assigned to each user to provide efficient services. Several works have been reported in the literature on mandatory and periodic component carrier assignment methods. Although the previous works, especially periodic component carrier assignment methods, have significantly improved performance of LTE and LTE-A systems, many limitations still exist. One limitation of previous works is that data transfer is interrupted during periodic component carrier assignment operation which can decrease performance of the system. Therefore, in this paper, selective periodic component carrier assignment technique which allows continues data transfer during periodic carrier assignment operations is proposed. Results show that the proposed technique increases throughput rate up to 25% and decreases average delay time up to 35%.

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Performance analysis of subband-level channel quality indicator feedback scheme of LTE

Cited by 22 publications

References 9 publications

An Accurate Model for EESM and its Application to Analysis of CQI Feedback Schemes and Scheduling in LTE

An Accurate Model for EESM and its Application to Analysis of CQI Feedback Schemes and Scheduling in LTE

Downlink Performance of Cellular Systems With Base Station Sleeping, User Association, and Scheduling

Selective Periodic Component Carrier Assignment Technique in LTE and LTE-A Systems

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