Patent ID: 9749093
Date: 2017-08-29
CPC Classifications: H04B,H04L,H04W

Claim:
1. A method for determining a number of hybrid automatic repeat request (HARQ) processes in a carrier aggregation system in which a plurality of serving cells are configured, the method comprising: receiving data in a downlink subframe of a second serving cell; and transmitting a positive acknowledgement/negative-acknowledgement (ACK/NACK) signal in response to the data in an uplink subframe of a first serving cell, wherein if the second serving cell uses a time division duplex (TDD) frame, the TDD frame is configured with any one of uplink-downlink configurations according to a table as follows: wherein D denotes a downlink subframe, S denotes a special subframe and U denotes an uplink subframe, and wherein if the first serving cell uses a frequency division duplex FDD frame, a maximum number of HARQ processes of the second serving cell is determined as a maximum number of HARQ processes of the first serving cell regardless of whether the second serving cell uses the FDD frame or the TDD frame.