Implicit PUCCH Resource Allocation for Semi-Persistent Scheduling
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in uplink control channel resource allocation, particularly for semi-persistent scheduling scenarios, where implicit resource allocation is not supported due to differences in configurations between downlink and uplink resources.
Innovation Solution
The proposed solution involves a user equipment (UE) receiving implicit indication of a physical uplink control channel (PUCCH) resource set based on parameters of downlink control information (DCI) transmitted on a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH), allowing the UE to calculate an index to a table of PUCCH resource sets using frequency, time, and spatial parameters, thereby enabling implicit PUCCH resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit indication of PUCCH resources is used, then reliability of resource allocation is improved, but signaling overhead increases
Solution Approach 1:
The UE determines PUCCH resources autonomously by calculating an index based on SPS-PDSCH parameters (such as time domain offset, frequency domain resource allocation, and HARQ process ID) without requiring explicit network indication. This self-determination mechanism reduces signaling overhead while maintaining reliable resource allocation through deterministic resource selection.
2Loss of information
If implicit PUCCH resource allocation is implemented, then signaling overhead is reduced, but device complexity increases
Solution Approach 1:
The patent transforms the resource allocation mechanism by changing from explicit parameter indication to implicit parameter derivation. The UE uses existing SPS-PDSCH parameters (time domain offset K0, frequency domain resource allocation, HARQ process ID) to calculate the PUCCH resource index through a standardized formula, avoiding the need for additional signaling parameters while keeping device complexity manageable through well-defined calculation rules.
3Loss of time
If implicit resource allocation based on SPS-PDSCH parameters is used, then latency is reduced, but configuration compatibility becomes more difficult
Solution Approach 1:
The patent creates a universal implicit resource allocation mechanism that works across different SPS configurations and DCI formats. By using standardized parameters (K0, frequency domain resource allocation, HARQ process ID) that are common to all SPS-PDSCH transmissions, the solution achieves broad compatibility while enabling fast autonomous resource determination by the UE, thus reducing latency without sacrificing configuration versatility.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In a wireless communications system, a user equipment (UE) may receive an indication from a base station that a downlink shared channel resource in a scheduled occasion, such as a semi-persistently scheduled occasion, includes downlink control information (DCI). The UE may monitor the downlink shared channel resource for the DCI based on the indication. The UE may determine a set of uplink control channel resources based on one or more parameters of the DCI and the downlink shared channel resource. The parameters of the DCI on the semi-persistently scheduled downlink shared channel may implicitly indicate the set of uplink control channel resources to the UE. The UE may transmit an uplink control message to the base station using the set of uplink control channel resources.