FIELD: radio engineering, communication.
SUBSTANCE: automatic repeat request (ARQ) transmitter for use in a wireless communication system and a method for its operation are provided. The method includes steps of determining unutilised capacity of an ARQ receiver buffer in an ARQ receiver by subtracting the summed amount of utilisation of the ARQ receiver buffer from the maximum size of the ARQ receiver buffer; determining if the ARQ receiver buffer can support an ARQ block to be transmitted if the size of the ARQ block to be transmitted is not greater than the determined unutilised capacity of the ARQ receiver buffer, and if it is determined that the ARQ receiver buffer can support the ARQ block to be transmitted, transmitting the ARQ block to the ARQ receiver, wherein determination of the unutilised capacity of the ARQ receiver buffer in the ARQ receiver includes a step of: determining ARQ blocks as utilising the ARQ receiver buffer for any ARQ blocks within an ARQ transmit window and any ARQ blocks outside the ARQ transmit window that are part of the same media access control (MAC) service data unit (SDU) as the first ARQ block within the ARQ transmit window.
EFFECT: preventing ARQ buffer overflow.
24 cl, 12 dwg
