Author(s): Szilveszter Nádas, Sándor Rácz, and Zoltán Nagy Ericsson Research. Sándor Molnár (Budapest University)

Globecom 2007

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Providing congestion control in the Iub Transport Network for HSDPA (pdf)

Abstract:
The introduction of High Speed Downlink Packet
Access (HSDPA) presents new challenges to be solved in the
UMTS Terrestrial Radio Access Network. Bandwidth reservation
for HSDPA is not efficient and TCP cannot efficiently resolve
a congestion situation because lower layer retransmissions hide
the congestion situations from TCP. An HSDPA Flow Control
algorithm was introduced by 3GPP to control congestion. This
HSDPA Flow Control algorithm was originally intended to
control radio scheduler queues in Node B. In this paper we
propose an algorithm that also provides congestion control in
the transport network. The performance analysis concentrates
on transport network limited scenarios and shows that the
algorithm can achieve high end-user perceived throughput, while
maintaining low delay and loss in the transport network. The
analysis also shows the advantages of the newly introduced
congestion detection functionality.

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