【資料名稱】：Performance Models for LTE-Advanced Random Access

【資料作者】：Revak Tyagi

【資料日期】：2014

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

LTE-Advanced networks employ random access based on preambles transmitted according
to multi-channel slotted Aloha principles. The random access is controlled
through a limit W on the number of transmission attempts and a timeout period for
uniform backoff after a collision. The LTE-Advanced random access system is modeled
by formulating the equilibrium condition for the ratio of the number of requests
successful within the permitted number of transmission attempts to those successful
in one attempt. It is analytically proved that for W ≤ 8 there is only one equilibrium
operating point, and for W ≥ 9 there are three operating points if the request
load  is between load boundaries 1 and 2. These load boundaries as well as the
corresponding system operating points are analytically identified. Analytical expressions
for the throughput and delay of successful requests at the operating points are
found and validated through simulations. Further, the results are generalized using
a steady-state equilibrium based approach and models for single-channel and multichannel
systems are developed, incorporating the barring probability PB. Ultimately,
the de-correlating effect of parameters O, PB, and Tmax
o is identified and the Poissonization
effect due to the backlogged requests in a slot is introduced. The impact of
Poissonization on different traffic is studied. Further research directions are discussed
at the conclusion.