Packet QoS Aware AMC Selection for 3G LTE of Evolved Packet System

Kyungkoo JUN  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.8   pp.2740-2743
Publication Date: 2008/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.8.2740
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
AMC,  QoS,  3G LTE,  evolved packet system,  

Full Text: PDF(224.9KB)>>
Buy this Article

3GPP evolved packet system (EPS) is an all-IP based system that supports various access networks such as LTE, HSPA/HSPA+ and non-3GPP networks. Recently, the support of IP flows with packet level QoS profiles has been added to the requirements of the EPS. This paper proposes an adaptive modulation and coding (AMC) scheme that supports the QoS of such IP flows in the 3G LTE access network of the EPS. Defining the retransmission as a critical factor for QoS, the proposed scheme applies different maximum packet error probability Pmax to each packet when selecting the AMC transmission mode. In determining Pmax, the QoS constraints as well as channel condition are considered, balancing two objectives: the satisfaction of the QoS and the maximization of spectral efficiency. Simulations show that it is able to reduce both delay violation and retransmission, while improving throughput in comparison with an existing scheme.