Terminal Device TCI State Ambiguity Resolution
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Solution Overview
Problem
Current communication systems face challenges in efficiently managing beam indication for downlink (DL) and uplink (UL) transmissions, particularly in multi-beam operations, leading to ambiguity and unnecessary beam switching due to the timing differences between PDCCHs and the reception of TCI states.
Innovation Solution
A method where a terminal device receives a first PDCCH indicating a TCI state and a second PDCCH, and performs communication with the network device using the second TCI state only after a predetermined time if the second PDCCH is received later, ensuring clarity and avoiding unnecessary beam switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal device applies TCI states based on PDCCH reception timing without a predetermined delay, then beam switching responsiveness is improved, but TCI state ambiguity and incorrect beam application occur
Solution Approach 1:
The patent introduces a predetermined time threshold as a preliminary condition before applying the TCI state. The terminal device determines whether the time difference between first and second PDCCH receptions exceeds this threshold before switching beams. This preliminary check prevents premature beam switching and ensures TCI state ambiguity is resolved correctly, maintaining both responsiveness and accuracy.
2Adaptability or versatility
If the terminal device monitors multiple PDCCH candidates without time threshold determination, then communication coverage is improved, but unnecessary beam switching and overhead increase
Solution Approach 1:
The patent performs preliminary determination of whether the time difference between PDCCH receptions exceeds a threshold before proceeding with beam switching. This preliminary action filters out cases where beam switching would be unnecessary, reducing complexity while maintaining comprehensive coverage through proper monitoring of multiple PDCCH candidates.
Solution Approach 2:
The patent dynamically adjusts beam switching behavior based on the time threshold condition. When the time difference exceeds the threshold, beam switching is performed; when it doesn't exceed, the original beam is maintained. This dynamic approach optimizes the balance between coverage and complexity by adapting to actual timing conditions.
3Loss of time
If the terminal device applies TCI states immediately upon PDCCH reception, then transmission latency is reduced, but beam indication ambiguity occurs
Solution Approach 1:
The patent introduces a preliminary time threshold check that determines whether immediate TCI state application is appropriate. By checking if the time difference between PDCCH receptions exceeds the threshold before applying the TCI state, the patent prevents ambiguous beam indications while minimizing unnecessary delays, thus resolving the contradiction between low latency and clear indication.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A terminal device receives a first physical downlink control channel (PDCCH) which indicates a first Transmission Configuration Indication (TCI) state and receives a second PDCCH which indicates a second TCI state from a network device. If the reception of the second PDCCH is later than the reception of the first PDCCH, the terminal device performs a communication with the network device with the second TCI. In this way, it avoids ambiguity between two TCI states. Further, it also avoids unnecessary beam switching.