PUCCH Resource Reallocation for Dynamic SPS in V2X
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Solution Overview
Problem
In wireless communication systems, especially in LTE-based V2X communications, existing methods fail to efficiently reallocate physical uplink control channel (PUCCH) resources in response to changes in semi-persistent scheduling (SPS) operations triggered by user equipment (UE), leading to suboptimal resource utilization and potential delays in message transmission.
Innovation Solution
A method and apparatus that allow user equipment (UE) to request and receive new PUCCH resource allocations from the network based on changes in SPS configurations, enabling dynamic reallocation of PUCCH resources to match varying message generation periods, such as in vehicle-to-everything (V2X) communications, thereby optimizing resource usage and ensuring timely message transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If SPS configuration is changed to adapt to dynamic message generation periods, then message transmission timeliness is improved, but PUCCH resource allocation becomes inconsistent leading to resource utilization degradation
Solution Approach 1:
The patent implements dynamic PUCCH resource allocation that automatically adapts when SPS configuration changes. The UE monitors SPS configuration updates and triggers PUCCH resource reallocation accordingly, ensuring the uplink control channel resources remain consistent with the current downlink message generation period, thus preventing resource waste while maintaining timely message transmission.
Solution Approach 2:
The system establishes a feedback mechanism where the UE detects SPS configuration changes and sends uplink notifications to the network. This feedback loop enables the network to reallocate PUCCH resources based on actual message generation patterns, ensuring resource allocation matches the dynamic requirements of V2X communications while maintaining high resource utilization efficiency.
2Productivity
If PUCCH resources are reallocated dynamically to match SPS changes, then resource utilization is improved, but system complexity increases due to additional signaling and coordination
Solution Approach 1:
The UE autonomously monitors SPS configuration changes and independently triggers PUCCH resource reallocation procedures without requiring complex network coordination. The UE uses pre-configured rules and parameters to determine when and how to reallocate resources, reducing the signaling overhead and management complexity while maintaining high resource utilization efficiency.
3Device complexity
If traditional PUCCH resource allocation is used without SPS change detection, then system complexity is reduced, but message transmission delays occur due to resource mismatch
Solution Approach 1:
The system pre-configures PUCCH resource allocation rules and parameters during initial SPS setup. When SPS configuration changes occur, the UE can quickly reallocate resources using these pre-configured parameters without complex real-time calculations, thus minimizing transmission delays while keeping the system relatively simple.
Data Source
AI summary
A user equipment (UE) receives, from a network, a semi-persistent scheduling (SPS) configuration and a physical uplink control channel (PUCCH) resource configuration. The PUCCH resource configuration may be included in the SPS configuration. When a change of an SPS operation is required, the user equipment transmits an SPS change request to the network and receives, from the network, an SPS resource grant activated according to the SPS change request. The user equipment changes allocation of a PUCCH resource allocated according to the PUCCH resource configuration, on the basis of the received SPS resource grant. For example, a timing at which or a period in which the PUCCH resource is allocated can be changed.