Patent ID: 8837411

Claim:
A method in a base station for scheduling user equipments in a cell, the base station and the user equipments are comprised in a wireless communication system adapted for contention based transmissions, the method comprising: sending a contention based grant of a retransmission process to a plurality of user equipments within the cell, receiving data from at least one of said plurality of user equipments using said contention based grant, verifying if the data is correctly received from the at least one user equipment, if it is verified that the data is not correctly received: sending a non-acknowledgement feedback to the plurality of user equipments, detecting if the data is not correctly received due to a collision, and sending a following contention based grant belonging to the same retransmission process as the first contention based grant to the plurality of user equipments, wherein the following contention based grant comprises information indicating if the following contention based grant should be used for initial transmission or for retransmission such that: if it is detected that the data is not correctly received due to a collision, setting the information in the following contention based grant to indicate that said following contention based grant is to be used for initial transmission, if the data is not correctly received but no collision is detected, setting the information in the following contention based grant to indicate that said following contention based grant is to be used for retransmission.