Communication method for carrier aggregation system, terminal and network equipment

Abstract

The invention discloses a communication method for a carrier aggregation system, and the carrier aggregation system comprises TDD carriers and FDD carriers, and comprises the steps that terminal equipment receives downlink information through an auxiliary carrier; and the terminal equipment sends feedback information for the downlink information through the main carrier, wherein when the main carrier or the auxiliary carrier is a TDD carrier, at least one first sub-frame containing P continuous sTTIs exists in the TDD carrier, at least one sTTI occupying two OFDM symbols exists in the P sTTIs,and P is an integer greater than 1. The embodiment of the invention also provides corresponding terminal equipment and network equipment. According to the technical scheme provided by the invention,the minimum scheduling unit of the TDD carrier in the carrier aggregation system is the sTTI of the two OFDM symbols, so that the scheduling delay of the TDD carrier and the FDD carrier can be balanced to a certain extent, the feedback bottleneck in the carrier aggregation system is reduced, and the air interface delay is reduced.

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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