Dynamic Traffic Multiplexing via Indication Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently multiplexing low latency and latency tolerant data transmissions, particularly in ensuring timely and reliable data delivery to UEs with differing latency requirements, such as URLLC and eMBB devices, without compromising spectral efficiency or increasing processing overhead.
Innovation Solution
The system employs dynamic resource allocation and indication-based multiplexing, where low latency data is transmitted in mini-slots or shorter TTUs, overlapping with latency tolerant data, and using explicit or implicit signaling to indicate the presence of low latency traffic within shared resources, allowing for puncturing or pre-emption of latency tolerant transmissions to accommodate urgent data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If low latency data is transmitted using puncturing or pre-emption of latency tolerant transmissions, then latency for low latency UEs is reduced, but spectral efficiency deteriorates due to resource waste
Solution Approach 1:
The base station performs preliminary actions by sending indication information to latency tolerant UEs before the puncturing or pre-emption occurs. This indication information notifies UEs about upcoming low latency transmissions, allowing them to prepare for potential resource reclamation. This advance notice enables more efficient resource management and reduces the need for complete resource retransmission, thereby improving spectral efficiency while maintaining low latency performance.
2Adaptability or versatility
If dynamic resource allocation is used to accommodate both low latency and latency tolerant traffic, then adaptability is improved, but device complexity increases due to scheduling overhead
Solution Approach 1:
The indication information is segmented into different types and levels, allowing the base station to provide targeted notifications to different UEs based on their specific traffic patterns and requirements. This segmentation enables more granular control over resource allocation and reduces the processing burden on both base station and UEs, as each UE only needs to process relevant indication information rather than comprehensive scheduling details.
Solution Approach 2:
The base station applies partial action by sending indication information only to UEs that are affected by upcoming low latency transmissions, rather than notifying all UEs. This selective approach reduces signaling overhead and processing complexity while still providing sufficient information for affected UEs to adjust their reception and processing accordingly.
3Reliability
If indication information is sent to UEs about low latency traffic presence, then reliability is improved for latency tolerant UEs, but processing overhead increases
Solution Approach 1:
The essential information needed for reliable data delivery is extracted from the complete scheduling information and conveyed to UEs through compact indication information. This extracted information includes only the critical elements such as resource allocation changes and transmission timing, allowing UEs to process minimal data while still achieving reliable reception. The extraction approach significantly reduces processing overhead compared to transmitting full scheduling details.
Data Source
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AI summary
A system and method for multiplexing traffic. A wireless device such as a base station may schedule a first transmission of first data (e.g., latency tolerant data) to a first UE on first resources, and transmit second data (e.g., low latency data) to a second UE on a portion of the first resources. The base station may signal a first indicator e.g. via Radio Resource Control (RRC) signaling to the first UE indicating that the first UE is to monitor for a second indicator that itself indicates the presence of second data on the first resources. The base station may then signal a second indicator to the first UE to indicate the presence of the second data on the first resources. By using the first indicator to initiate the monitoring of the second indicator, the first UE can reduce the amount of monitoring it needs to perform if there is no second data traffic in a certain period of time or in a certain frequency band.