PHY Resource Reallocation Indicators for URLLC Pre-Emption
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in reallocating resources to meet stringent quality of service requirements for higher priority traffic, such as ultra-reliable low latency communications (URLLC), leading to suboptimal use of wireless spectrum and performance degradation for lower priority traffic.
Innovation Solution
The reallocation of physical (PHY) layer resources, including transport blocks and rate-split messages, is facilitated through advanced cancellation and pre-emption indicators in downlink and uplink messages, allowing spatial multiplexing of communications to accommodate higher priority traffic without entirely canceling resources allocated to lower priority traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time and frequency resources are reallocated to serve URLLC traffic, then URLLC quality of service requirements are satisfied, but spectrum efficiency decreases and performance of non-URLLC traffic degrades
Solution Approach 1:
The patent segments the reallocation indication into multiple granularities: resource block (RB) level, physical resource block (PRB) level, and resource element (RE) level. This allows the base station to reallocate only the specific portions of resources needed for URLLC traffic while leaving other portions available for non-URLLC traffic, thereby maintaining spectrum efficiency while satisfying URLLC requirements.
Solution Approach 2:
The patent applies local quality by enabling differentiated reallocation at specific resource locations rather than uniform reallocation across all allocated resources. The base station can indicate to UEs that certain RBs, PRBs, or REs are reallocated for URLLC while other resources remain dedicated to non-URLLC traffic, optimizing both reliability and spectrum efficiency locally.
2Adaptability or versatility
If downlink pre-emption and uplink cancellation messages are used to reallocate resources, then higher priority traffic is accommodated, but overhead increases and resource allocation complexity increases
Solution Approach 1:
The patent introduces dynamic resource allocation indicators that can be configured and activated based on network conditions and traffic requirements. The base station can dynamically adjust the granularity and scope of reallocation indications, switching between RB-level, PRB-level, and RE-level indications as needed, thereby adapting to different traffic scenarios without permanently increasing system complexity.
Solution Approach 2:
The patent changes the parameters of resource allocation by introducing configurable reallocation indication fields in DCI messages. These parameters include the granularity of reallocation (RB, PRB, or RE level), the scope of reallocation (specific resource indices), and the activation status of pre-emption and cancellation mechanisms. This allows flexible adaptation to different priority traffic requirements while maintaining manageable complexity through parameter configuration rather than structural changes.
3Loss of time
If entire time and frequency resources are reallocated for URLLC, then URLLC latency requirements are met, but performance of lower priority traffic degrades significantly
Solution Approach 1:
The patent applies partial action by enabling the base station to reallocate only the minimum necessary portion of resources for URLLC traffic rather than entire allocated resources. Through fine-grained indicators at RB, PRB, and RE levels, the system reallocates just enough resources to meet URLLC latency requirements while preserving the majority of resources for non-URLLC traffic, thus minimizing impact on lower priority traffic performance.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support reallocation of physical (PHY) layer resources allocated for wireless communication. In a first aspect, a method of wireless communication performed by a user equipment (UE) includes receiving, from a network, downlink control information (DCI) for reallocating one or more resources allocated to communications for the UE. The DCI includes at least one reallocation indicator that indicates reallocation of one or more PHY layer resources allocated to the UE. The method also includes performing a responsive action based on the at least one reallocation indicator. Other aspects and features are also claimed and described.