Download This PaperDynamic Uplink - Downlink Configuration in TD-LTE with HARQ Feedback
Advanced Computing & Communication Technologies (ACCT 2016), DOI: 10.3850/978-981-11-0783-2_347
4 Pages Posted: 13 May 2019 Last revised: 27 Jul 2020
Date Written: September 4, 2016
Abstract
Mobile communication has become data centric and data traffic is increasing exponentially. LTE systems were originally designed for symmetric & almost fixed uplink and downlink capacity distribution. The pattern of data usage is dynamic and incommensurable for uplink and downlink. Enhanced Interference Mitigation and Traffic Adaptation (eIMTA) is one of the features which enable TD-LTE systems to handle asymmetric and dynamic uplink and downlink capacity requirements. eIMTA allows dynamic changes to configurable TDD patterns for uplink and downlink. There are impacts on HARQ timeline, acknowledgement transmission timing because of changes in uplink & downlink configuration. This paper explains eIMTA and HARQ timeline issues and proposes semi-static HARQ timeline mechanism. SIB1 indicated uplink HARQ reference configuration for each serving cell solves uplink sub-frame mismatch issue. Device can derive reference configuration for each cell's uplink and downlink HARQ on basis of HARQ timeline. Downlink HARQ based soft buffer partitioning has semi-static changes, which helps to minimize throughput loss.
Keywords: eIMTA, HARQ, TD-LTE, TDD Patterns, RRM Timing
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