Patent ID: 8352820

Claim:
A method of forming at least one ARQ (Automated Repeat Request) PDU (Protocol Data Unit) from an ARQ SDU (Service Date Unit), the PDU and the SDU being packets to be transmitted in a network, ARQ PDU comprising an ARQ header and a data portion, the method comprising selective addition of a Length Indicator (LI) field to the said ARQ header responsive to the determination of the presence in the ARQ PDU of the last bit of an ARQ SDU, wherein, in a case where a plurality of ARQ PDUs from different ARQ SDUs are formed into one HARQ (Hybrid ARQ) PDU, the LI field is not included in the last ARQ PDU if it is found not to be carrying the last bit of the ARQ SDU and LI field is added to all other ARQ PDUs though they are not carrying last bit of ARQ SDU.