PUCCH Resource Allocation in Two-Step Random Access
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing random access procedures, particularly in determining the physical uplink control channel (PUCCH) resources for hybrid automatic repeat request (HARQ) feedback in two-step random access channels, which affects communication efficiency and reliability.
Innovation Solution
The system involves a user equipment (UE) transmitting a first message (MsgA) and receiving a downlink control information (DCI) message, determining a PUCCH resource based on the DCI, and transmitting HARQ-ACK feedback on the determined resource, with the second message (MsgB) including an uplink grant field and a PUCCH resource indicator field to facilitate accurate resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE determines PUCCH resources for HARQ feedback in two-step random access procedure, then the communication reliability is improved, but the device complexity and procedure overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring PUCCH resource sets and associated parameters through higher-layer signaling (RRC configuration) before the random access procedure. The base station provides the UE with a set of configured PUCCH resources, including time-frequency resources, formats, and spatial relations, so that when HARQ feedback needs to be transmitted, the UE can directly select from pre-configured options rather than determining resources in real-time, thus improving reliability while reducing procedural complexity
Solution Approach 2:
The patent uses the PUCCH resource indicator field in MsgB as an intermediary that carries the scheduling information for HARQ feedback transmission. Instead of direct complex resource determination, the indicator field serves as a mediator that maps to pre-configured PUCCH resource sets, simplifying the resource selection process while ensuring reliable HARQ feedback transmission through properly allocated resources
2Productivity
If the PUCCH resource allocation is optimized for timely HARQ feedback, then the communication efficiency is improved, but the resource management complexity increases
Solution Approach 1:
The patent segments PUCCH resources into multiple configured resource sets, where each set contains specific time-frequency resources and transmission parameters. The PUCCH resource indicator field in MsgB indicates which specific resource within the configured set should be used. This segmentation allows the system to provide timely HARQ feedback by having pre-allocated resources ready, while reducing management complexity through structured organization of resources into configurable sets
Solution Approach 2:
The patent enables flexible parameter configuration for PUCCH resources, including time offset, frequency resources, format selection, and spatial relation parameters. By allowing these parameters to be configured through higher-layer signaling and dynamically selected via the PUCCH resource indicator, the system can optimize communication efficiency for different scenarios while managing complexity through parameterization rather than hard-coded resource allocation
Data Source
AI summary
Systems, devices, and techniques for random access in a wireless communication network are described. A described technique performed by a user equipment (UE) includes transmitting a first message of a two-step random access procedure to a node of a wireless communication network; receiving, in response to the first message, a downlink control information (DCI) message via a physical downlink control channel (PDCCH) and a second message of the two-step random access procedure via a physical downlink shared channel (PDSCH) in accordance with the DCI message; determining, by the UE, a physical uplink control channel (PUCCH) resource based on the second message; and transmitting, by the UE, hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback for the second message on the determined PUCCH resource.