A single DCI schedule PDSCHs or PUSCHs on multiple CCs. The transmission mode of the CCs scheduled by the single DCI include TB based transmission or code block group (CBG) based transmission. There are two soft combining level, TB level and CBG level. The receiver determines the soft combining level according to the RRC configuration of each CC. When the soft combining level is CBG level, the method to determine the number of CBG transmission information (CBGTI) bits includes at least one of the following:

Method 1

The number of CBGTI bits is equal to the number of the total CBGs in all CCs scheduled by the single DCI. The number of CBGTI bits is defined by protocol or configured by RRC signaling.

Method 2

The number of the CBGs in each CC is n_i (i=0, . . . , I?1), I is the number of CC. The number of CBGTI bits is equal to max [n₀, . . . , n_I-1]. The number of CBGTI bits is defined by protocol or configured by RRC signaling.

This embodiment describes example methods to determine HARQ process number mapping on different CCs.

The single DCI schedules multiple transmission resources on different CCs. Each transmission resource is distributed on a CC. The maximum of HARQ process number shared by multiple CCs is P that can are defined by predefined protocol or RRC signaling configuration. The method to determine the process number of the CC includes at least one of the following:

Method 1

Average of HARQ process number shared by the CCs with the same HARQ entity. The total number of the CC is c. The HARQ process number of the first CC is