Reservation-Temporary frame identification for ARQ in slotted-ALOHA type protocol

摘要

In a cellular mobile packet data communication system using a reserved slotted ALOHA protocol, an automatic repeat request (ARQ) function is provided by assigning a temporary frame identifier to each data frame transmitted from or to a mobile station. The assigned TFI is unique within the simultaneously occurring frame transmission sequences within the cell and is allocated based on information in the channel reservation message preceding the data frame transmitted to the mobile station or based on information in the data frame transmitted to the mobile station. The TFI may be allocated based on the information in the channel reservation message preceding the data frame transmitted to the mobile station. The assigned TFI is unique within the same sequence of packet transmissions occurring within the cell. The TFI is contained in every block belonging to a specific frame, and the block is a unit of data on which the ARQ is based. The partial data frame to be retransmitted at the time of transmission error includes only blocks determined by the ARQ protocol type used (e.g., optional or Go-Back-N). Here, there is no need to add a primary block to identify the mobile station. The blocks belonging to the frames directed to different mobile stations may be multiplexed on the downlink based on the TFI. The mobile station may include an indicator indicating that the TFI is already assigned in the random access request.