Admission control in LTE uplink systems with sounding reference signals based channel state indicator
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Abstract
This article focuses on the investigation of the
Admission Control techniques in order to assure Quality of
Service (QoS) in Long Term Evolution (LTE) systems. So as to
estimate the users bandwidth requirement, Sounding Reference
Signals (SRS) bandwidth are allocated to each user in order
to have accurate up-to-date channel state information at the
evolved Node B (eNB). Since User Equipments (UEs) are power
limited, several SRS are required to scan the full bandwidth for
UEs with high path loss. Therefore, in order to own reliable
information the eNB must trade-off up-to-date information and
accuracy of the measurement. This paper investigates a novel
way in which the eNB measures the users radio requirements
in order to accomplish QoS, using the information on the SRS
already known by the eNB. This measurement technique is
compared against two models presented in [1], first a reference
AC model in which users are accepted up to a cell bit-rate limit,
and a second one proposed by the authors in which the users
requirements are estimated using the power control formula and
the Shannon capacity. The methodology followed is based on
system level simulations. Results show that the SRS based AC
is more optimist when estimating users channel conditions and
therefore more users are accepted to the system, increasing the
overall cell throughput when compared to the power control
based algorithm.
CitacióLema, M. [et al.]. Admission control in LTE uplink systems with sounding reference signals based channel state indicator. A: COST IC1004 Cooperative Radio Communications for Green Smart Environments. "COST IC1004 Cooperative radio communications for green smart environments: 3rd Scientific meeting, 8-10 Febrer, 2012, Barcelona, Spain". Barcelona: 2012.
Versió de l'editorhttp://www.ic1004.org
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