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Compared to WCDMA, the LTE radio access has a significantly shorter Transmission Time Interval (TTI) in order to reduce end-to-end delays. However, if a User Equipment (UE) at the cell edge is limited by its available transmission power, it may not be able to transmit an entire VoIP packet during one TTI, since the instantaneous source data rate is too high. Thus TTI bundling has been recently introduced...
A well-known concept to adapt the transmitted pay- load to the current channel capacity is to perforin segmentation of the uncoded user payload. A new cross layer approach to hybrid ARQ was introduced that performs first channel coding and then segmentation of coded bits. In this paper, we denote the traditional approach as radio centric, while the latter is denoted as packet centric. By changing...
Work is ongoing in 3GPP to significantly extend the performance of UMTS in the work item long term evolution (LTE). LTE contains a new system architecture with fewer infrastructure nodes and it has been decided to terminate the ARQ functionality in the evolved node B. This paper describes the requirements that exists for an LTE ARQ concept and outlines a solution that fulfills these requirements in...
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