Cross-layer analysis of the random access mechanism in Universal Terrestrial Radio Access |
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Authors: | Ji-Hoon YunAuthor Vitae |
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Affiliation: | Kumoh National Institute of Technology, Gumi-si, Gyeongbuk, Republic of Korea |
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Abstract: | In 3GPP Universal Terrestrial Radio Access, a user equipment uses the Random Access Channel (RACH) for uplink transmission if it does not have a pre-established dedicated channel. RACH is a contention-based transport channel in which access control and open-loop power control functionalities are provided under the interactions between Medium Access Control (MAC) and physical layers. This paper develops a Markov chain model to analyze complex cross-layer interactions in RACH procedures, which is crucial to understanding the RACH performance. Besides, the Markov chain accurately describes the time-synchronized RACH behavior in slot level. The presentation of this time-synchronized behavior is simplified by merging multiple sub-states, each of which corresponds to a slot delay, into a single state. Finally, the proposed model analytically evaluates the RACH performance in Rayleigh fading channels in terms of throughput and delay. |
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Keywords: | Random access Universal Terrestrial Radio Access Cross layer |
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