Downlink Control Information Processing Timeline Determination
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Solution Overview
Problem
In wireless communication systems, the ambiguity in timing for downlink control information processing, particularly when using multiple physical downlink control channel candidates, leads to uncertainties in feedback transmission and uplink control resource overriding, affecting communication efficiency and reliability.
Innovation Solution
The network node determines a clear timeline for downlink control information processing by monitoring the end of the second physical downlink control channel candidate, which ends later in time, to transmit feedback messages or override uplink control resources, ensuring timely and accurate communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple physical downlink control channel candidates are used for downlink control information transmission, then communication reliability is improved, but timing ambiguity increases affecting feedback transmission and uplink control resource overriding
Solution Approach 1:
The patent applies preliminary action by pre-defining the reference physical downlink control channel candidate as the one ending latest in time among multiple candidates. This predetermined rule eliminates timing ambiguity before feedback transmission or uplink control resource overriding decisions need to be made, ensuring that the network node consistently uses the correct reference candidate for timing calculations.
2Measurement precision
If the network node waits for the second physical downlink control channel candidate to end before transmitting feedback, then timing accuracy is improved, but feedback transmission delay increases
Solution Approach 1:
The patent applies dynamics by making the reference physical downlink control channel candidate selection adaptive to the actual transmission timing. Instead of always waiting for a fixed second candidate, the system dynamically determines which candidate ends latest and uses that as the reference, optimizing the balance between timing accuracy and feedback delay based on actual channel conditions.
Data Source
AI summary
Methods, systems, and devices for wireless communication at a user equipment (UE) are described. A first network node may receive, from a second network node, downlink control information based on monitoring at least one of a first physical downlink control channel candidate or a second physical downlink control channel candidate that are linked for physical downlink control channel repetition. In some examples, the second physical downlink control channel candidate may end later in time than the first physical downlink control channel candidate. The first network node may identify an absence of a scheduled physical downlink shared channel based on the downlink control information. The first network node may then transmit, to the base station, a feedback message in response to the downlink control information at least a threshold number of time units after the second physical downlink control channel candidate.