A method and system for sending a random access response

A technology of random access response and sending method, which is applied in transmission systems, digital transmission systems, electrical components, etc., and can solve problems such as RA--RNTI confusion

Active Publication Date: 2021-12-03
CHENGDU TD TECH LTD
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  • Abstract
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  • Claims
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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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  • A method and system for sending a random access response

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Embodiment Construction

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] For the uplink large bandwidth requirement of video upload, a special FDD cell can be established in the LTE system: the FDD cell includes a pair of FDD carriers and one or more uplink carriers with different frequency points. Among a pair of FDD carriers in an FDD cell, the downlink carrier is the only downlink carrier in this special FDD cell, and the uplink carrier is the main uplink carrier of this special FDD cell. uplink secondary carrier.

[0020] In this special FDD cell, the FDD frame structure is adopted: the only downlink carrier and each uplink carrier adopt the FDD frame structure, and the only downlink carrier in the FDD cell performs all the downlink carriers in the ordinary FDD cell in the same way. The uplink main...

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Abstract

The present application discloses a method and system for sending a random access response. The method includes: configuring an uplink carrier for a user equipment UE supporting the cell in an FDD cell configured with a pair of FDD carriers and at least one uplink carrier of a different frequency point, And carry the identification of each uplink carrier allocated for the UE in the configuration information of the uplink carrier; when the UE sends PRACH on a configured uplink carrier, and the uplink carrier corresponds to the unique downlink carrier of the FDD cell When controlling the PDCCH search space in the domain, determine the RA-RNTI corresponding to the PRACH according to the identifier corresponding to the carrier, and after sending the PRACH, detect the RA-RNTI scrambling in the PDCCH search space within the RAR detection window If the PDCCH scrambled by the corresponding RA‑RNTT is detected, the PDSCH is received according to the downlink control information DCI on the PDCCH. The present invention can solve the problem of confusion of RA-RNTIs corresponding to PRACHs on different uplink carriers in an FDD cell configured with a pair of FDD carriers and at least one uplink carrier of different frequency points.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04W72/04H04W72/12H04W72/14H04W74/08
Inventor 魏立梅袁乃华范晨朱玉梅周志宏
Owner CHENGDU TD TECH LTD
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