Patent ID: 9635660
Date: 2017-04-25
CPC Classifications: H04L,H04W

Claim:
1. A method of receiving data in a wireless communication system, the method performed by a wireless device and comprising: monitoring a downlink control channel; determining to use a fallback mode instead of a pre-configured mode if the wireless device is configured with the pre-configured mode but is unable to use the pre-configured mode; receiving control information on an allocation of a downlink resource through the downlink control channel according to the fallback mode; determining whether the control information includes a field indicating information related to a radio resource of a downlink reference signal according to the fallback mode; self-determining a spreading factor based on a number of downlink control channels in a Physical Resource Block (PRB) pair or a number of antenna ports according to the fallback mode if it is determined that the control information does not include the field; receiving a downlink reference signal for demodulating a downlink transmission block based on a spreading sequence according to the spreading factor; and receiving the downlink transmission block through a downlink shared channel based on the allocation of the downlink resource, wherein the pre-configured mode specifies a first format of the control information that includes the field; and wherein the fallback mode specifies a second format of the control information that does not include the field.