Method for sending hybrid automatic repeat request-acknowledge character (HARQ-ACK) feedback information

Abstract

An embodiment of the invention discloses a method for sending HARQ-ACK feedback information. The method is used for configuring different conditions for time division duplex (TDD) uplink and downlink of a plurality of component carriers (CCs) in carrier aggregation (CA). The method is characterized by comprising that user equipment (UE) receives physical downlink shared channel (PDSCH) data which is sent by a base station and scheduled by a physical downlink control channel (PDCCH), generates HARQ-ACK feedback information according to the received PDCCH and the PDSCH data, and sends the HARQ-ACK feedback information on a physical uplink control channel or the PUSCH according to an HARQ-ACK bound window configuration and timing relation determined when transmission of the HARQ-ACK feedback information on the PUCCH is required.

Description

technical field [0001] The present invention relates to the technical field of wireless communication systems, in particular to a method for sending hybrid automatic repeat request (HARQ-ACK) feedback information. Background technique [0002] The Long Term Evolution (LTE) system supports two duplex modes of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). figure 1 It is the frame structure of the TDD system. The length of each radio frame is 10ms, which is equally divided into two half-frames with a length of 5ms. Each half-frame contains 8 time slots with a length of 0.5ms and 3 special domains, namely downlink pilot time slot (DwPTS), guard interval (GP) and uplink pilot time slot (UpPTS), these 3 special domains The sum of the lengths is 1ms. Each subframe consists of two consecutive time slots, that is, the kth subframe includes time slot 2k and time slot 2k+1. The TDD system supports 7 different uplink and downlink configurations, as shown in Table 1...

AI Technical Summary

Problems solved by technology

[0012] The above method for sending HARQ-ACK feedback information realizes the support of the HARQ mechanism in the existing TDD system that adopts CA, and multiple Cells in CA adopt the same uplink and downlink configuration; however, in some cases, each Cell in CA Adjacent frequencies may have deployed different TDD uplink and downlink configurations (for example, adjacent frequencies have different TD-SCDMA configurations). In fact, when the frequency domain distance between multiple Cells that make up CA is large enough, these Cells can completely adopt different TDD uplink and downlink configurations without interfering with each other; therefore, currently in LTE-A TDD system In the follow-up research, how to effectively implement the HARQ mechanism under the condition that the TDD uplink and downlink configurations of multiple cells of CA are different has become an important research topic.

Then what comes with it is how the UE sends HARQ-ACK feedback information to support the HARQ mechanism in this case; and for this technical problem, there is no specific implementation method yet

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