Uplink Preemption Indication Handling for Random Access Resource Reallocation
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Solution Overview
Problem
Wireless communication systems face inefficiencies in dynamically reallocating uplink resources between different traffic types, such as enhanced mobile broadband (eMBB) and ultra-reliable low-latency communications (URLLC), due to challenges in managing preemption indications for random access transmissions, particularly in contention-based and contention-free random access procedures.
Innovation Solution
The implementation of uplink preemption techniques, where a base station issues preemption indications (ULPIs) to reallocate uplink resources, allowing user equipment (UEs) to monitor and adjust their transmissions based on preconfiguration rules, ensuring efficient handling of random access messages in various operating states and procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink resources are dynamically reallocated between eMBB and URLLC traffic types, then resource utilization and prioritization are improved, but the complexity of managing preemption indications for random access transmissions increases
Solution Approach 1:
The patent segments the random access procedure into distinct phases (contention-based and contention-free) with different preemption handling rules. This segmentation allows the base station to apply differentiated preemption indications to different traffic types, enabling efficient resource reallocation while managing complexity through structured control mechanisms.
Solution Approach 2:
The patent implements dynamic preemption indication management where the base station can flexibly adjust preemption behavior based on current traffic conditions and resource availability. The system dynamically determines whether to apply preemption to contention-based or contention-free random access procedures, optimizing resource utilization in response to changing network conditions.
2Productivity
If preemption indications are applied to all random access transmissions, then resource reallocation efficiency is improved, but the reliability of random access procedures deteriorates
Solution Approach 1:
The patent applies local quality by differentiating preemption indication application based on the specific type of random access procedure. Contention-based random access transmissions are subject to preemption indications, while contention-free transmissions are excluded. This localized differentiation maintains reliability for critical contention-free procedures while enabling efficient resource reallocation for contention-based traffic.
Solution Approach 2:
Instead of applying preemption uniformly across all random access procedures, the patent inverts the approach by selectively excluding certain procedures (contention-free) from preemption indications. This inversion ensures that critical reliability requirements for specific access types are preserved while still achieving resource reallocation efficiency where applicable.
3Speed
If UEs continuously monitor for preemption indications, then resource allocation responsiveness is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic monitoring of preemption indications rather than continuous monitoring. UEs are configured to monitor for preemption indications at specific intervals or triggered by certain events, which reduces energy consumption while maintaining adequate responsiveness to resource reallocation opportunities. This periodic action allows the system to balance between responsiveness and power efficiency.
Data Source
AI summary
According to some examples, a base station may allocate uplink and/or downlink resources (e.g., in the time domain, frequency domain, spatial domain) to user equipment (UEs), or groups of UEs, that may be subsequently reallocated. For example, a base station may determine a reallocation of uplink resources, and may issue a preemption indication (e.g., a cancelation indication) that may correspond to at least a portion of a random access resource. UEs may be configured to monitor for preemption indications and, based on received preemption indications, UEs may determine whether or not to proceed with transmission of a random access message using a random access resource that at least partially overlaps with resources indicated by the preemption indication. For example, a UE may transmit, or preempt transmission of, a random access message based on a preemption configuration of the UE (e.g., configured rules for UE preemption of random access resources).