Dynamic HARQ Process Allocation for Sidelink Preemption
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Solution Overview
Problem
Existing wireless networks face challenges in efficiently allocating and managing resources for sidelink communication, particularly in vehicular applications where communication requirements are stringent and unpredictable.
Innovation Solution
The implementation of a method that involves identifying transport blocks for transmission or reception via sidelink, determining preemptable HARQ processes, and associating these processes with transport blocks to manage resource allocation and preemption based on preemption status and priority parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ processes are allocated statically to transport blocks, then resource allocation is simple, but resource utilization efficiency deteriorates when communication requirements change
Solution Approach 1:
The patent implements dynamic HARQ process allocation where the association between HARQ processes and transport blocks is not fixed but can be changed based on preemption status and priority parameters. The MAC layer maintains multiple active HARQ processes and can reassociate them with different TBs according to changing communication requirements, transforming the static allocation into a dynamic system that adapts to varying traffic conditions.
Solution Approach 2:
The patent introduces preemption status parameters and priority parameters that can be changed to control HARQ process allocation. By modifying these parameters, the system can dynamically adjust which HARQ processes are preempted and reassigned to different transport blocks, enabling flexible resource allocation without changing the fundamental HARQ mechanism structure.
2Reliability
If HARQ processes are preempted and reassigned to high-priority transport blocks, then data transmission reliability improves, but system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the MAC layer continuously monitors the status of ongoing transmissions and the availability of HARQ processes. Based on this feedback and the priority parameters of incoming transport blocks, the system determines whether to preempt existing HARQ processes and reassign them, creating a closed-loop control system that improves reliability through informed decision-making.
Solution Approach 2:
The patent uses preemption status parameters and priority parameters as control variables to manage HARQ process preemption. By changing these parameters based on transmission success/failure and traffic priority, the system can dynamically adjust resource allocation to maintain high reliability without requiring complex manual intervention or rigid predetermined rules.
3Adaptability or versatility
If multiple active HARQ processes are maintained for flexible allocation, then adaptability improves, but resource overhead increases
Solution Approach 1:
The patent makes HARQ processes universal by designing them to be reusable across multiple transport blocks rather than dedicating specific processes to specific TBs. Each HARQ process can serve multiple TBs over time through preemption and reassociation, allowing a smaller number of HARQ processes to handle a larger variety of transmission scenarios, thereby reducing the total number needed while maintaining high adaptability.
Solution Approach 2:
The patent implements dynamic sharing of HARQ processes among multiple transport blocks. Instead of maintaining a fixed one-to-one mapping, the system allows HARQ processes to be dynamically assigned to different TBs based on priority and availability, enabling fewer HARQ processes to efficiently serve multiple simultaneous transmissions through time-multiplexed allocation.
Data Source
AI summary
Methods for resource allocation and provisioning in a wireless user equipment for sidelink communication with another wireless user equipment are disclosed. For example, a preemption procedure is implemented for allocating active Hybrid Automatic Repeat reQuest (HARQ) processes in a MAC layer of the wireless user equipment to efficient transmit or receive transport blocks. The preemption procedure may be based on preemption status parameters and preemption priority parameters associated with various transport blocks competing for the HARQ process resources.