Downlink?control?information (DCI) transmission method and device under cross band carrier aggregation

Abstract

The invention relates to the communication field and discloses a downlink?control?information (DCI) transmission method under cross band carrier aggregation and a downlink?control information (DCI) transmission device under the cross band carrier aggregation. The downlink?control? information (DCI) transmission method comprises the following steps that: long?term?evolution-advanced user equipment (LTE-A UE) which is aggregated with carriers with different time?division?duplex (TDD) uplink / downlink configuration acquires configuration information according to a pre-agreed rule or high-level signaling and determines whether a downlink control?information (DCI) format which is used by a physical downlink control channel (PDCCH) contains a downlink?assignment?index (DAI) and an uplink (UL) index, wherein the physical downlink control channel (PDCCH) is used for scheduling a physical uplink shared channel (PUSCH); and the above operation in the above step is performed on a common?search?space (CSS) and an UE-specific?search?space (USS) independently and respectively. By means of the above technical schemes, it can be ensured that the size of downlink control?information (DCI) which is transmitted in the common?search?space (CSS) does not change, and therefore, normal transmission of public information of a community can be ensured; and at the same time, a specific bit field in the downlink control?information (DCI) can be reasonably determined in the UE-specific?search?space (USS) according to actual requirements, and therefore, uplink (UL) multi-frame scheduling and / or resource cost control of ACK / NACK on the physical uplink shared channel (PUSCH) can be supported.

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 (Time division 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 e...

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 UL index and DAI according to the UE's SIB-1TDD uplink / downlink configuration cannot meet the above requirements, and may also cause the DCI format to include UL index and DAI at the same time. In the case of 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. How to determine whether the DCI format includes UL index and DAI for the UE of cross-band carrier aggregation? no clear method yet

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