Performance analysis and enhancements of packet forwarding in LTE

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Journal Title
Journal ISSN
Volume Title
Perustieteiden korkeakoulu | Master's thesis
Date
2009
Major/Subject
Tietokoneverkot
Mcode
T-110
Degree programme
Language
en
Pages
(11+) 55 s.
Series
Abstract
At handover between base stations in Long Term Evolution (LTE), data is forwarded from a source eNB to a target eNB. The mechanism for handling the packet forwarding is specified in Third Generation Partnership Project (3GPP) Release 8 specifications. The goal of the thesis is to analyse, evaluate and improve the packet forwarding mechanism. The techniques to reduce the amount of forwarded data in the downlink will be studied as a part of the thesis. Such enhancements include modifications to the Radio Link Control (RLC) protocol, as well as improved interactions with other layers, most notably Packet Data Convergence Protocol (PDCP) and Radio Resource Control (RRC). Performance criteria considered for evaluating these techniques include the PDCP buffer size at the source eNB, uplink RLC status load and user object bit rate. The thesis recommends the LTE network to poll the UE more frequently during the ongoing handover scenarios, compared to the case when handover is not ongoing. This allows the source eNB to be as up to date to the UE reception state as possible, and thus reduces the number of unacknowledged PDCP SDUs to he forwarded to the target eNB. Based on the simulation results, this proposed technique proves to be the most efficient in terms of lower PDCP buffer size at the source eNB, lower uplink RLC status load and higher user object bit rate.
Description
Supervisor
Tarkoma, Sasu
Zander, Jens
Thesis advisor
Larmo, Anna
Keywords
data forwarding, handover, LTE, PDCP, RLC
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