公开(公告)号：US20210243802A1

公开(公告)日：2021-08-05

申请号：US17250021

申请日：2018-05-07

Applicant: NOKIA TECHNOLOGIES OY

Inventor： Guillaume DECARREAU ,  Irina-Mihaela BALAN ,  Muhammad NASEER-UI-ISLAM

IPC: H04W74/00 ,  H04W74/08 ,  H04W74/02 ,  H04W36/08 ,  H04W56/00 ,  H04B7/08 ,  H04W76/19

Abstract: An apparatus suitable for at least to: transmit at least one first random access request by using a first preamble to a first handover target cell or to a first beam provided by a serving cell, if responded, carry out a synchronization to the first handover target cell or to the first beam provided by the serving cell, if not responded, transmit at least one second random access request by using at least one second preamble to at least one second handover target cell or to at least one second beam provided by the serving cell; store information on not-responded random access requests and/or resources not used for random access requests, wherein the information comprises preambles used, and transmit, after being synchronized, the stored information to the first handover target cell, the at least one second handover target cell and/or the serving cell for being used in random access resource allocation.