Random Access Resource Determination Using QCL Reference Objects
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Solution Overview
Problem
In mobile communications, terminals face challenges in determining available random access resources due to uncertainty in unlicensed frequency bands, leading to failures in random access procedures when they can only select resources based on measured SSBs without considering quasi-co-located resources.
Innovation Solution
A method for terminals to obtain and determine available random access resources by utilizing both target and quasi-co-located reference objects, increasing the number of available resources and improving random access success rates by considering the quasi-co-location relationship between SSBs and CSI-RS signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal selects random access resources based only on measured SSB, then the resource selection process is simple, but the random access success rate decreases due to limited available resources
Solution Approach 1:
The patent merges the target reference object (measured SSB) with QCL reference objects (other SSBs or CSI-RS) to form an extended reference object set. This combination allows the terminal to determine random access resources based on multiple reference objects rather than a single measured SSB, thereby increasing the number of available random access resources and improving access success rate while maintaining reasonable selection complexity
2Ease of operation
If the terminal can only select RO based on measured SSB, then the determination process is straightforward, but available random access resources are insufficient leading to procedure failure
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure QCL reference objects and their associations with random access resources in advance. The terminal utilizes these pre-configured relationships to expand its resource selection options without requiring complex real-time measurements or determinations, thus maintaining operational simplicity while increasing resource availability and adaptability
3Quantity of substance
If the network device configures multiple SSB resources but the terminal cannot measure all of them, then the network can provide diverse downlink signals, but the terminal lacks sufficient reference objects for random access resource determination
Solution Approach 1:
The patent uses QCL (quasi-co-location) relationships as an intermediary mechanism. The network device configures QCL reference objects that are spatially or temporally related to the target reference object. These QCL reference objects serve as intermediaries, allowing the terminal to infer channel characteristics and determine random access resources even when direct measurement of all downlink signal resources is not feasible, thus bridging the gap between available downlink signals and measurable reference objects
Data Source
AI summary
The present disclosure discloses a random access resource determining method, a terminal, and a network device thereof. The method applied to a terminal side includes: obtaining a quasi co-location (QCL) reference object that is quasi co-located with a target reference object; and determining an available random access resource based on the target reference object and the QCL reference object.