Conditional PDSCH Burst Dropping for XR Delay Budgets
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Solution Overview
Problem
Wireless communications systems face challenges in efficiently managing downlink shared channel (PDSCH) bursts, particularly in extended reality (XR) communications, where delayed or undecoded packets can lead to resource wastage and loss of content due to failure to meet application delay budgets.
Innovation Solution
Implementing a method where user equipment (UE) can conditionally drop downlink messages based on predefined conditions, such as threshold quantities of negative acknowledgments or downlink messages, allowing for efficient resource allocation and avoiding unnecessary decoding of packets that will not meet the application delay budget.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE decodes all downlink messages in a PDSCH burst, then the completeness of data reception is improved, but the resource wastage increases when packets fail to meet application delay budgets
Solution Approach 1:
The network entity performs preliminary action by transmitting a control message that schedules multiple downlink messages and indicates conditions for canceling decoding. This allows the UE to preemptively cancel decoding of subsequent downlink messages in a burst when certain conditions are met (e.g., failure to decode a threshold quantity of messages), avoiding waste of processing resources and energy on messages that cannot be successfully decoded anyway.
2Quantity of substance
If the UE continues decoding downlink messages beyond application delay budget, then more data may be received, but the effectiveness of XR communications deteriorates due to loss of content
Solution Approach 1:
The mechanism uses feedback from decoding outcomes to control continued reception. When the UE fails to decode a threshold quantity of downlink messages or receives a threshold quantity of negative acknowledgments, it feeds back this information and cancels further decoding of the first set of downlink messages. This feedback-driven approach ensures that resources are not wasted on messages that cannot be successfully decoded within the application delay budget, maintaining effectiveness of XR communications.
3Productivity
If the network transmits multiple downlink messages in a burst, then the productivity of data transmission is improved, but the difficulty of managing decoding operations increases
Solution Approach 1:
The network entity merges the scheduling control of multiple downlink messages into a single control message. This control message schedules multiple downlink messages associated with a burst and includes indications of conditions for canceling decoding. By combining multiple scheduling decisions into one control message, the system maintains high productivity of data transmission while reducing the complexity of decoding management at the UE.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some wireless communications systems, a user equipment (UE) may receive a control message scheduling multiple downlink control messages associated with a burst. The control message may indicate a condition associated with canceling decoding of a first set of downlink messages from the multiple downlink messages based on a failure to decode a second set of downlink messages from the multiple downlink messages. In some examples, the condition may indicate a threshold quantity of negative acknowledgment messages or a threshold quantity of downlink messages. As such, the UE may cancel the decoding of at least a subset of the first set of downlink messages from the multiple downlink messages based on the condition. In some cases, the UE may transmit an indication that the UE canceled the decoding of the at least subset of the first set of downlink messages.