Random access response sending method and system

Abstract

The invention discloses a random access response sending method and system. The method includes: configuring an uplink carrier in a FDD cell configured with a pair of FDD carriers and an uplink carrier of the at least one different frequency point, and configuring an uplink carrier for the user equipment UE supporting the cell, and carrying, in the configuration information of the uplink carrier,each allocated for the UE The identifier of the uplink carrier; when the UE sends the PRACH on the configured one of the uplink carriers, and the uplink carrier corresponds to the PDCCH search space in the control domain on the downlink carrier that is unique to the FDD cell, determining according to the identifier corresponding to the carrier The RA-RNTI corresponding to the PRACH, and after transmitting the PRACH, detecting the RA-RNTI scrambled PDCCH in the PDCCH search space in a RAR detection window, and if the corresponding RA-RNTT scrambled PDCCH is detected, according to The downlink control information DCI on the PDCCH receives the PDSCH. With the present invention, the problem that the RA-RNTI corresponding to the PRACH on different uplink carriers is confused in the FDD cell inwhich the uplink carriers of the pair of FDD carriers and the at least one inter-frequency point are configured can be solved.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a random access response sending method and system. Background technique [0002] At present, in the third generation partnership project (3GPP) protocol of the wireless interface, the FDD cell of LTE has a pair of carriers: an uplink carrier and a downlink carrier, and the downlink carrier sends a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) and Physical Broadcast Channel (PBCH). The user equipment (UE) learns the physical layer cell identity (ID) of the FDD cell, the duplex mode of the cell, and the radio frame timing and subframe timing of the cell by detecting the PSS and SSS carried by the downlink carrier. After that, the UE can determine the lower two digits of the radio frame number in the FDD cell and the number of downlink transmission ports of the cell by detecting the PBCH carried by the downlink carrier, and can obtain t...

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Problems solved by technology

[0007] In view of this, the main purpose of the present invention is to provide a method and system for sending a random access response, which can solve the problem of: in an FDD cell configured with a pair of FDD carriers and at least one uplink carrier of a different frequency point, different uplink carriers The problem of RA--RNTI confusion corresponding to PRACH

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