TEMPORARY FRAME IDENTIFICATION FOR ARQ IN A RESERVATION-SLOTTED-ALOHA TYPE OF PROTOCOL

摘要

Automatic repeat request (ARQ) functionality in a cellularmobile packet data communication system using a reservation slotted-ALOHA protocol is provided by assigning a temporary frame identity(TFI) to each data frame transmitted to or from a mobile station. Theassigned TFI is unique among concurrent frame transfer sequences ina cell, and may be assigned based on information in a data frame sentto the mobile station or based on information in a channel reservationmessage that precedes the data frame sent to the mobile station. TheTFI may also be assigned based on information in a channel reservationmessage that precedes a data frame sent from the mobile station, andthe TFI assigned is unique among concurrent frame transfer sequencesin a cell. The TFI is included in every block belonging to a particularframe, a block being the unit of data on which ARQ is based. A partialdata frame to be retransmitted in case of a transmission error containsonly the blocks determined by the ARQ protocol type (e.g., selectiveor Go-back-N) used, whereby a primary block need not be added toidentify the mobile station. Blocks belonging to frames destined fordifferent mobile stations can be multiplexed on the downlink based onthe TFI. The mobile station may include, in its random access request,an indication that a TFI is already assigned.