Dynamic PUCCH Resource Allocation for Random Access Acknowledgments
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and NR, face challenges in identifying resources for transmitting acknowledgments during random access procedures, especially in networks with dynamically configured physical uplink control channels (PUCCH) and two-step random access procedures.
Innovation Solution
A method and apparatus for determining resources for transmitting acknowledgments based on frequency bands, message sequences, payload information, or grants associated with random access procedure messages, allowing for dynamic identification of PUCCH resources even in varying configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic PUCCH configurations are used to improve resource flexibility, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary mapping relationship between RACH message resources and PUCCH resources. Instead of directly configuring complex dynamic PUCCH resources, the system uses the relatively simple RACH message resources as an intermediary to indirectly determine PUCCH resources, thereby reducing UE complexity while maintaining adaptability
Solution Approach 2:
The patent makes the RACH message resources serve multiple functions: they not only carry random access information but also serve as the basis for determining PUCCH resources for acknowledgment transmission. This multi-functionality reduces the need for separate PUCCH resource configuration while maintaining flexibility
2Loss of information
If implicit resource determination is used to reduce signaling overhead, then loss of information is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent establishes a feedback mechanism where the gNB sends RACH messages with resource information, and the UE uses this information to determine PUCCH resources for acknowledgment. This closed-loop feedback ensures that the implicit determination is based on accurate, exchangeable information between gNB and UE, maintaining precision while reducing signaling overhead
Solution Approach 2:
The gNB performs preliminary action by including resource determination information in the RACH messages it sends to the UE. This preliminary provision of information allows the UE to accurately determine PUCCH resources without requiring additional signaling, thus maintaining precision while reducing overall signaling overhead
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine information that identifies a resource for transmitting an acknowledgment of a message associated with a random access procedure. The information that identifies the resource may be determined based at least in part on at least one of: a frequency band associated with the random access procedure, a resource associated with at least one message in a sequence of messages associated with the random access procedure, a payload of at least one message in the sequence of messages associated with the random access procedure, or a grant associated with another message in the sequence of messages associated with the random access procedure. In some aspects, the user equipment may transmit the acknowledgment based at least in part on the information that identifies the resource. Numerous other aspects are provided.