METHOD AND APPARATUS FOR SUB-WINDOWED RANDOM ACCESS RESPONSE SEARCH WINDOW FOR CONTENTION FREE AND LOW COMPLEXITY EXTENSION OF THE RAR SEARCH TIME IN HETNETS WITH ANY BACKHAUL

摘要

A new approach to random access signaling for a HetNet deployment is proposed. First, a predetermined response window for searching for a random access response is divided into two or more sub-windows. User equipment is configured to search each of the sub-windows for the RAR response. The two or more sub-windows are divided by a delay. The sub-windows are selected such that the sub-windows of a first predetermined response window do not overlap with the sub-windows of a second predetermined response window. The two or more sub-windows and the delay are configured to compensate for one or more backhaul delays between low-power nodes and a macro node.