Uplink Preemption Indication for URLLC and eMBB Multiplexing
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently multiplexing high latency and low latency communications, as existing techniques are insufficient in managing resource reallocation and interference between ultra-reliable low latency communications (URLLC) and enhanced mobile broadband (eMBB) communications, leading to interruptions and increased latency.
Innovation Solution
The system employs an uplink preemption indication mechanism where a base station allocates resources based on priority, transmitting a preemption message to URLLC users to preempt eMBB communications, allowing efficient resource reallocation and minimizing interference by adjusting transmit power and repetition numbers based on detected preemption indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher priority communications (URLLC) are preempted over lower priority communications (eMBB), then reliability and latency requirements of URLLC are met, but spectral efficiency and resource utilization of eMBB are reduced
Solution Approach 1:
The system dynamically adjusts resource allocation and preemption behavior based on communication priority levels. The base station monitors ongoing eMBB transmissions and dynamically preempts resources when URLLC traffic arrives, while UEs adaptively respond to preemption indications by adjusting their transmission behavior. This dynamic mechanism allows the system to optimize for URLLC reliability when needed while maintaining eMBB spectral efficiency during normal operation.
Solution Approach 2:
The base station sends preemption indications to UEs in advance before actual resource reallocation occurs. This preliminary notification allows UEs to prepare for potential transmission interruptions or resource changes, enabling smoother transitions between communication priorities without significant performance degradation to either URLLC reliability or eMBB spectral efficiency.
2Object-affected harmful factors
If preemption indication monitoring is implemented, then interference between URLLC and eMBB is minimized, but device complexity and processing overhead increase
Solution Approach 1:
The preemption indication mechanism is segmented into distinct components: base station-generated preemption indications, control channel transmissions carrying these indications, and UE-side monitoring and response mechanisms. This segmentation allows each component to be optimized independently, reducing overall system complexity while effectively minimizing interference between URLLC and eMBB communications.
Solution Approach 2:
The preemption indication acts as an intermediary signal between the base station and UEs, mediating resource allocation decisions without requiring direct complex interactions between communicating parties. This intermediary mechanism simplifies the control flow and reduces processing complexity at each node while still achieving effective interference minimization.
3Speed
If uplink preemption indication is transmitted on control channel, then resource reallocation speed is improved, but power consumption increases
Solution Approach 1:
The preemption indication monitoring is implemented as a periodic operation where UEs check for preemption indications at specific intervals rather than continuously. This periodic approach maintains fast resource reallocation capability when preemption occurs while significantly reducing average power consumption during non-preemption periods, balancing speed and energy efficiency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station in wireless communication with the UE, an allocation of time and frequency resources for an uplink transmission of a first communication type associated with a threshold reliability or latency metric. The UE may monitor a control channel for an uplink preemption indication from the base station, the uplink preemption indication indicating whether the UE should transmit the uplink transmission using the first communication type associated with the threshold reliability or latency metric. The UE may then process the uplink transmission based on monitoring the control channel for the uplink preemption indication.