Group-Common DCI Feedback via Dedicated PUCCH Resources
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing group-common downlink control information (DCI) due to the inability to determine which user equipment (UEs) have successfully received the DCI, leading to wasted processing and signaling resources.
Innovation Solution
Implementing a dedicated physical uplink control channel (PUCCH) resource for each UE to transmit feedback messages based on resource configuration, allowing successful reception confirmation of group-common DCI, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If group-common DCI is transmitted to multiple UEs without individual feedback, then signaling overhead is reduced, but the system cannot determine which UEs successfully received the DCI leading to wasted processing resources
Solution Approach 1:
The patent segments the feedback mechanism by assigning dedicated PUCCH resources to individual UEs within a group, allowing each UE to independently feedback its DCI reception status. This segmentation enables the system to obtain specific reception status information from each UE while maintaining group-common DCI transmission, thus resolving the contradiction between reduced signaling overhead and obtaining reception status information.
Solution Approach 2:
The patent implements a feedback mechanism where UEs transmit acknowledgment information via dedicated PUCCH resources based on successful DCI reception. This feedback loop allows the base station to determine which UEs successfully received the group-common DCI, preventing wasted processing resources while maintaining efficient group communication.
2Reliability
If dedicated PUCCH resources are allocated to each UE for feedback, then reception status can be determined, but resource configuration complexity increases
Solution Approach 1:
The patent employs a universal resource configuration approach where a single group-common DCI message contains resource allocation information that applies to multiple UEs simultaneously. The DCI includes a resource indicator that UEs use to determine their dedicated PUCCH resources, reducing the need for separate individual configurations while maintaining reliable feedback capability.
Solution Approach 2:
The patent performs preliminary resource configuration by pre-defining PUCCH resource sets and indicators that are referenced by group-common DCI messages. This preliminary setup reduces real-time configuration complexity while ensuring reliable feedback transmission, as UEs can determine their dedicated resources based on pre-configured parameters and DCI indicators.
3Loss of information
If all UEs in a group transmit feedback simultaneously, then reception status is obtained, but uplink resource collision and interference increase
Solution Approach 1:
The patent segments the uplink feedback transmission by assigning orthogonal or non-overlapping PUCCH resources to different UEs within the group. This segmentation can be achieved through different time slots, frequency resources, or code sequences, allowing simultaneous feedback transmission without collision or interference while obtaining reception status from all UEs.
Solution Approach 2:
The patent resolves uplink resource collision by introducing additional resource dimensions such as time-domain offsets, frequency-domain allocations, or code-domain separation. By utilizing multiple dimensions for resource allocation, the system enables simultaneous feedback transmission from multiple UEs without interference, maintaining both feedback information collection and low uplink interference.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a physical uplink control channel resource, dedicated to the UE for transmitting a feedback message for group-common downlink control information (DCI), based at least in part on a resource configuration. The UE may transmit the feedback message based at least in part on whether the group-common DCI is successfully received. Numerous other aspects are provided.