Linked Downlink Control Channel Repetition for Random Access Timing
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Solution Overview
Problem
In wireless communications systems, user equipment (UE) may struggle to identify a timeline for transmitting an uplink random access message after receiving a downlink control channel order associated with linked control channel candidates, and may also face uncertainty in selecting a quasi-colocation (QCL) assumption when these candidates correspond to different transmission configuration indicator (TCI) states.
Innovation Solution
The UE is configured with rules for performing a random access procedure by receiving an indication that linked downlink control channel candidates are associated with a threshold delay period and specific QCL assumptions, allowing it to transmit an uplink random access message and receive downlink control channel orders efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE receives downlink control channel orders via multiple linked downlink control channel candidates, then the reliability of receiving the order is improved, but the complexity of identifying the transmission timeline and selecting QCL assumptions increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with rules through RRC signaling that define threshold delay periods and QCL assumptions for linked downlink control channel candidates. These rules are established before the actual random access procedure, enabling the UE to automatically apply the correct timeline and QCL selection logic without real-time complexity, thus resolving the contradiction between improved reliability through multiple candidates and reduced operational complexity.
2Measurement precision
If the UE waits for a threshold delay period after receiving the downlink control channel order, then the accuracy of random access message transmission timing is improved, but the time required to complete the random access procedure increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the threshold delay period parameter based on the specific configuration of linked downlink control channel candidates and their associated QCL assumptions. Rather than using a fixed delay, the system optimizes the delay parameter to achieve accurate timing synchronization while minimizing the overall time required for the random access procedure, thus resolving the contradiction between timing accuracy and procedure speed.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an indication that a first downlink control channel candidate and a second downlink control channel candidate are linked for downlink control channel repetition. The UE may receive a downlink control channel order requesting the UE to participate in a random access procedure. In some examples, the downlink control channel order may be received via one or both of the first and second downlink control channel candidates, and the UE may perform the random access procedure in accordance with one or more rules pertaining to receipt of the downlink control channel order via linked downlink control channel candidates. Additionally or alternatively, the UE may receive, in accordance with the one or more rules, the downlink control channel order via a downlink control channel candidate that is not linked for downlink control channel repetition.