Pdcch order triggering prach transmission for multi-trp operation

By introducing specific fields or signaling methods into the PDCCH command DCI, the problem of the UE being unable to distinguish the CFRA procedure mode in multi-TRP mode is solved, ensuring correct power control and communication efficiency.

CN122139451APending Publication Date: 2026-06-02APPLE INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
APPLE INC
Filing Date
2024-10-29
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

When a user equipment (UE) communicates with multiple transmit and receive points (TRPs), existing technologies cannot effectively distinguish the execution mode of the contention-free random access (CFRA) procedure, especially in multi-TRP mode and cell handover scenarios. This causes the UE to be unable to correctly understand how to respond to physical downlink control channel (PDCCH) commands and downlink control information (DCI) messages.

Method used

By introducing specific fields or signaling methods into the PDCCH command DCI, such as a 1-bit flag indicator, slot index, CORESET ID, 3-bit cell indicator, and 1-bit physical cell ID field, it is possible to distinguish whether the UE is executing the CFRA process of two timing advance (2TAs_mTRP) features under multiple DCIs or the mobility (2TAs_LTM) feature triggered by layer 1/layer 2, and to reset the closed-loop power control (CLPC) index during the CFRA process.

Benefits of technology

This enables the UE to correctly execute the CFRA procedure in multi-TRP scenarios, avoiding inappropriate adjustments to power control and improving communication efficiency and reliability.

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Abstract

An apparatus is disclosed, configured to: process a Physical Downlink Control Channel (PDCCH) command downlink control information (DCI) indicating a contention-free random access (CFRA) procedure based on a signal received from a base station, wherein the apparatus is configured to have two timing advance (TA) features (2TAs_mTRP) under multiple DCIs at multiple transmit and receive points (mTRP) without cell handover and two timing advance (TA) features (2TAs_LTM) under layer 1 / layer 2 triggered mobility; and determine, based on the PDCCH command DCI, whether to perform a CFRA procedure targeting the 2TAs_mTRP feature or the 2TAs_LTM feature.
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