DCI transmission method and device under cross-band carrier aggregation

Abstract

The present invention relates to the communication field, and discloses a DCI transmission method and device under cross-band carrier aggregation. The method is as follows: for LTE-A UEs that aggregate carriers with different TDD uplink / downlink configurations, according to pre-agreed rules or high-level The signaling configuration information determines whether the DCI format used for scheduling the PDCCH of the PUSCH includes the DAI and the UL index, and is independently determined for the CSS and the USS. In this way, the size of the DCI transmitted in the CSS can be guaranteed not to change, thereby ensuring the normal transmission of cell public information. At the same time, the specific bit fields in the DCI can be reasonably determined in the USS according to actual needs, thereby supporting UL multi-frame scheduling and / or Or resource overhead control of ACK / NACK on PUSCH.

Description

technical field [0001] The present invention relates to the communication field, in particular to a DCI transmission method and device under cross-band carrier aggregation. Background technique [0002] In the Long Term Evolution (LTE, Long Term Evolution) system, for each TDD (Timedivision duplex, time division duplex) wireless frame, seven TDD uplink / downlink configurations are defined, as shown in Table 1; where D stands for downlink Subframe, U stands for uplink subframe, S stands for special subframe. The special subframe consists of three parts: DwPTS (Downlink Pilot Time Slot, downlink pilot time slot), GP (Guard Period, protection time) and UpPTS (Uplink Pilot Time Slot, uplink pilot time slot). [0003] Table 1 [0004] (uplink / downlink configuration of TDD system) [0005] [0006] In the LTE-A (Long Term Evolution-Advanced, long-term evolution upgrade) system, the peak rate of the system is greatly improved compared with the LTE system. It is necessary to ex...

AI Technical Summary

Problems solved by technology

[0018] However, in the existing technology, the method in Rel-10 to determine whether the DCI format includes the UL index and DAI according to the SIB-1TDD uplink / downlink configuration of the UE cannot meet the above requirements, and may also cause the DCI format to include both the UL index and the DAI For example, when the UE aggregates two carriers with SIB-1TDD uplink / downlink configurations 0 and 1, the size of the DCI format transmitted in the CSS is changed, thereby affecting the normal transmission of cell public information

Therefore, the method of determining whether the DCI format includes UL index and DAI in Rel-10 is no longer applicable to the cross-band carrier aggregation system. Currently, how to determine whether the DCI format includes UL index and DAI for the UE of cross-band carrier aggregation, no clear method yet

Images