A communication method, terminal and network equipment for carrier aggregation system

Abstract

The present application discloses a communication method for a carrier aggregation system. The carrier aggregation system is a carrier aggregation system including a TDD carrier and an FDD carrier, including: a terminal device receives downlink information through a secondary carrier; The feedback information of the downlink information, when the main carrier or the auxiliary carrier is a TDD carrier, there is at least one first subframe containing P consecutive sTTIs in the TDD carrier, and there is at least one sTTI occupying 2 OFDM symbols among the P sTTIs , P is an integer greater than 1. Embodiments of the present invention also provide corresponding terminal equipment and network equipment. Since the minimum scheduling unit of the TDD carrier in the carrier aggregation system is the sTTI of two OFDM symbols, the technical solution of the present invention can balance the scheduling delay of the TDD carrier and the FDD carrier to a certain extent, reduce the feedback bottleneck in the carrier aggregation system, and reduce the Air interface delay.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular to a communication method, terminal and network equipment used in a carrier aggregation system. Background technique [0002] With the development and changes of mobile communication service requirements, many organizations such as the International Telecommunication Union have defined higher user plane delay performance requirements for future mobile communication systems. One of the main methods to shorten the user delay performance is to reduce the transmission time interval (transmission time interval, TTI), that is, to use a short transmission time interval (short transmission time interval, sTTI). For the sTTI downlink, the number of sTTIs that can be transmitted within a subframe length (1 ms) and the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by each sTTI need to be redesigned. [0003] The standard specification of sTT...

AI Technical Summary

Problems solved by technology

Based on the standard specifications in the 3rd generation partnership project (3rd generation partnership project, 3GPP) Release-15, if the FDD carrier uses 2 / 3 OFDM symbols as the sTTI division mode of the subframe, TDD uses 7 OFDM symbols, and the FDD carrier Every 2 / 3 OFDM symbols can generate an uplink feedback opportunity, while the downlink minimum sTTI of the TDD carrier is 7 OFDM symbols, which cannot make full use of every feedback opportunity of the FDD uplink carrier, and there is a bottleneck in the feedback

When the TDD carrier is used as the main carrier, the downlink feedback of the FDD carrier is carried on the TDD carrier. Based on the standard specification in 3GPP Rel-15, 2 / 3 OFDM symbols are used for the FDD carrier, and 7 OFDM symbols are used as the subframe for TDD. In the case of the sTTI division mode, the terminal can generate one feedback information every 2 / 3 OFDM symbols receiving the FDD carrier, while each uplink subframe of TDD can only provide two feedback opportunities, and there is a bottleneck in the feedback

Therefore, no matter which of the above situations, the existence of the feedback bottleneck will lead to the transmission delay of the feedback information

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