Patent ID: 9571236
Date: 2017-02-14
CPC Classifications: H04L,H04W

Claim:
1. A method of transmitting Downlink Control Information (DCI), applicable to a scenario where a Time Division Duplex (TDD) carrier and a Frequency Division Duplex (FDD) carrier are aggregated, wherein for transmission of DCI over any current carrier, the current carrier is a TDD carrier or an FDD carrier to be scheduled, the method comprises: determining Downlink Assignment Index (DAI) information fields in uplink scheduling DCI and downlink scheduling DCI to be carried over the current carrier and a Hybrid Automatic Repeat ReQuest (HARQ) process number information field in the downlink scheduling DCI, dependent upon a duplex mode of a primary carrier, wherein a uplink scheduling DCI to be carried over a current TDD carrier comprises no DAI field the same as a uplink scheduling DCI carried over a primary FDD carrier, a downlink scheduling DCI to be carried over the current TDD carrier comprises no DAI field and 3 bits HARQ process number information field the same as downlink scheduling DCI carried over the primary FDD carrier, or a uplink scheduling DCI to be carried over a current FDD carrier comprises 2 bits of DAI field the same as a uplink scheduling DCI carried over a primary TDD carrier, a downlink scheduling DCI to be carried over the current FDD carrier comprises 2 bits of DAI and 4 bits of HARQ process number information fields the same as a downlink scheduling DCI carried over the primary TDD carrier; determining an Uplink (UL) index information field in the uplink scheduling DCI to be carried over the current carrier dependent upon a Physical Uplink Shared Channel (PUSCH) scheduling scheme currently used for the current carrier; generating the corresponding uplink scheduling DCI and downlink scheduling DCI from results of determining the respective information fields; and transmitting the uplink scheduling DCI and the downlink scheduling DCI to UE over the current carrier.