HARQ Feedback Resource Allocation in 5G Random Access
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Solution Overview
Problem
In 5G wireless communication systems, there is a lack of effective solutions for HARQ feedback from terminals to base stations during the two-step random access process, leading to conflicts in PUCCH resources used by multiple terminals, which reduces feedback efficiency.
Innovation Solution
The method involves the base station returning a second random access message (Msg.B) indicating unique HARQ feedback resources for each terminal, allowing each terminal to perform HARQ feedback on distinct resources, thereby reducing resource conflicts and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple terminals use the same HARQ feedback resource in the two-step random access process, then the feedback resource configuration is simple, but resource conflicts occur and feedback efficiency decreases
Solution Approach 1:
The patent segments the HARQ feedback resources by associating different feedback resources with different random access preamble groups. Terminals selecting preambles from different groups will use different PUCCH resources for HARQ feedback, thereby avoiding resource conflicts while maintaining manageable configuration complexity
Solution Approach 2:
The patent applies local quality by configuring different HARQ feedback resource parameters (such as PUCCH resource indicators) for different terminals based on their specific random access preamble selections. This allows each terminal to have optimized local resource allocation rather than using a uniform configuration for all terminals
2Productivity
If unique HARQ feedback resources are allocated to each terminal, then resource conflicts are reduced and feedback efficiency improves, but the complexity of resource management increases
Solution Approach 1:
The patent performs preliminary action by pre-configuring multiple random access preamble groups and associating each group with specific HARQ feedback resources before the random access procedure begins. This allows terminals to independently determine their feedback resources based on preamble selection without requiring complex real-time resource allocation decisions
Solution Approach 2:
The patent enables self-service by allowing terminals to autonomously determine their HARQ feedback resources based on the random access preamble they selected. The terminal itself performs the resource selection without requiring additional signaling from the network, reducing overall system complexity
Data Source
AI summary
A method and apparatus for HARQ feedback includes, after receiving a first random access message Msg.A sent by each of at least one terminal, a base station returning a second random access message Msg.B to the at least one terminal. The Msg.B is configured to indicate respective feedback parameters of HARQ feedback terminals in the at least one terminal, and respective HARQ feedback resources of the HARQ feedback terminals are different. The base station receives, on the respective HARQ feedback resources of retransmission terminals, HARQ feedback sent for the Msg.B by the retransmission terminals respectively.