Pre-Emption Buffer Indication for Slot Receiver Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling pre-emption of slot transmissions by mini-slot transmissions, leading to interference and the need for effective indication of pre-empted resources in the soft buffer to maintain performance.
Innovation Solution
A pre-emption indication message is introduced to explicitly signal which part of the soft buffer should be handled separately, including information such as subframe/slot number, time pointer, HARQ process number, carrier indicator, time and frequency domain resources, and redundancy version, to facilitate precise handling of corrupted data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If mini-slot transmission is used to meet stringent latency requirements, then latency is reduced, but interference to slot receivers increases
Solution Approach 1:
The network node sends pre-emption indication information to the wireless device before the wireless device processes the pre-empted slot transmission. This allows the wireless device to proactively clear its buffer and avoid using corrupted data for decoding, thereby reducing interference while maintaining low latency for mini-slot transmissions.
Solution Approach 2:
The pre-emption indication information is segmented into specific fields (e.g., slot indication field, OFDM symbol indication field, carrier indicator field) that separately identify different aspects of the pre-empted resources. This segmentation allows precise identification of affected resources without requiring blanket retransmission, reducing overall interference.
2Productivity
If dynamic resource allocation is implemented for efficient system resource use, then resource efficiency is improved, but complexity of resource management increases
Solution Approach 1:
The pre-emption indication information structure is designed to be universal and multi-functional. It can indicate pre-emption across different carriers, slots, and OFDM symbols using a standardized format with bitfields that can be configured for various scenarios. This universal structure simplifies resource management complexity while maintaining high resource efficiency.
Solution Approach 2:
The pre-emption indication mechanism is dynamic and adaptable. The network node can selectively activate or deactivate indication fields based on the specific pre-emption scenario, and the indication information can cover different time-frequency granularities. This dynamic approach allows efficient resource allocation without requiring complex fixed-structure management.
3Reliability
If pre-emption indication information is sent to wireless devices, then handling of pre-empted data is improved, but signaling overhead increases
Solution Approach 1:
The pre-emption indication information provides local quality by specifically identifying only the affected portions of the transmission (specific slots, OFDM symbols, carriers) rather than indicating complete pre-emption. This localized indication improves reliability by providing precise information about what needs to be handled differently, while minimizing signaling overhead by not transmitting unnecessary information about unaffected resources.
Solution Approach 2:
The patent implements partial action by sending pre-emption indication information only when actual pre-emption occurs, rather than continuously. The indication covers only the specific resources that are pre-empted (partial action) rather than all resources. This approach improves data handling reliability while keeping signaling overhead minimal by avoiding excessive transmission of pre-emption information.
Data Source
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AI summary
According to certain embodiments, a method is disclosed for use in a wireless device being affected by pre-emption. The method comprises receiving information from a network node and performing one or more operations based on the received information. The information indicates a portion of a buffer that is affected by pre-emption. Examples of operations that can be performed based on the received information include flushing the portion of the buffer affected by pre-emption or separately handling the portion of the buffer affected by pre-emption.