Harq in spatial multiplexing mimo system

摘要

Methods and apparatus for signaling scheduling information in a spatial multiplexing wireless communications system as well as corresponding methods and apparatus for processing such signaling information, are disclosed. An exemplary method for signaling scheduling information includes scheduling first and second transport blocks for simultaneous transmission during a first transmission interval on first and second data substreams, respectively, and further includes assigning a single re-transmission process identifier for the first transmission interval and transmitting first scheduling information for the first transmission interval. The first scheduling information includes the re transmission process identifier and first disarnbiguation data. The method further includes scheduling at least one of the first and second transport blocks for re transmission during a second transmission interval and transmitting second scheduling information for the second transmission interval, the second scheduling information including the re-transmission process identifier and second disambiguation data. The first and second disambiguation data indicate whether the re-transmission of the retransmitted transport block is scheduled for the first or second data substream and may be used by a receiver to determine the same. SCHEDULE STAND 2ND BLOCKS FOR SIMULTANEOUS TRANSMISSION IN 1ST INTERVAL ASSIGN A SINGLE PROCESS IDENTIFIER FOR 1ST INTERVAL TRANSMIT SCHEDULING INFORMATION, INCLUDING PROCESS IDENTIFIER AND 1ST SUBSTREAM MAPPING BIT RECEIVE NACK FOR (AT LEAST) ONE OF 1ST AND 2ND BLOCKS SELECT PRIMARY OR SECONDARY SUIBSTREAM FOR RE-TRANSMISSION, BASED ON CHANNEL CONDITIONS SCHEDULE THE NACKED TRANSPORT BLOCK FOR RE-TRANSMISSION DURING 2ND TRANSMISSION INTERVAL TRANSMIT 2ND SCHEDULING INFORMATION, INCLUDING PROCESS IDENTIFIER AND 2ND SUBSTREAM MAPPING BIT 3/'l SU$BYiiTUTE SHEET (RULE .iB)