Patent ID: 8699408
Filing Date: 2014-04-15
Classification: H04L

Abstract:
1. A method for controlling transmission over a radio channel between a sending unit and a group of receiving units in a radio communication system, the method comprising the following steps relating to information aimed at a subgroup of a plurality of receiving units of said group of receiving units: transmitting said information over the radio channel from the sending unit, wherein the information transmitted over the radio channel from the sending unit contains an indication of the receiving units of the subgroup; determining at each receiving unit of said group of receiving units whether said receiving unit is one of the receiving units indicated by said indication; receiving a positive acknowledgement from at least each receiving unit of the subgroup, the positive acknowledgment transmitted by each receiving unit of the subgroup indicating that the corresponding receiving unit has received said transmitted information correctly over said radio channel; checking whether a corresponding positive acknowledgment has been received by the sending unit from each receiving unit of said subgroup; and in response to determining that the corresponding positive acknowledgment has not been received by the sending unit from each receiving unit of said subgroup, re-transmitting said information over the radio channel to all receiving units of said group.