PRACH Occasion Adaptation Using SSB Mapping and Availability Schemes
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Solution Overview
Problem
Existing wireless communication systems do not efficiently define and utilize physical random-access channel (PRACH) occasions for advanced user equipment (UEs), particularly in relation to synchronization signal block (SSB) mappings and availability schemes, leading to inefficiencies in PRACH transmissions.
Innovation Solution
A UE receives a configuration for PRACH occasions within an association period, with some occasions mapped to SSB transmissions and others unmapped, allowing selective PRACH transmissions based on availability schemes, mapping cycle associations, and repetition thresholds to optimize PRACH usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH occasions are mapped to SSB transmissions, then connection reliability is improved, but PRACH resource utilization efficiency deteriorates
Solution Approach 1:
The PRACH occasions are segmented into two distinct subsets: a first subset mapped to SSB transmissions for reliable connection establishment, and a second subset unmapped to SSB for flexible resource utilization. This segmentation allows the system to simultaneously maintain connection reliability through SSB-mapped occasions while improving resource efficiency through unmapped occasions that can be used without strict synchronization requirements.
Solution Approach 2:
Different quality requirements are applied to different PRACH occasions based on their mapping status. SSB-mapped PRACH occasions maintain strict synchronization and reliability characteristics, while unmapped PRACH occasions allow more flexible timing and resource allocation. This local differentiation optimizes overall system performance by matching resource characteristics to specific usage scenarios.
2Adaptability or versatility
If all PRACH occasions are made available for transmissions, then PRACH transmission flexibility is improved, but interference management becomes more difficult
Solution Approach 1:
PRACH occasions are divided into available and unavailable subsets, allowing the system to provide transmission flexibility through available occasions while managing interference by controlling or restricting usage of unavailable occasions. This segmentation enables selective activation of PRACH resources based on network conditions and interference levels.
Solution Approach 2:
The availability of PRACH occasions is dynamically controlled through availability schemes that can adjust which occasions are available or unavailable based on current network conditions. This dynamic management allows the system to optimize the balance between transmission flexibility and interference control in real-time, activating additional PRACH resources when interference is low and restricting them when interference becomes problematic.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a signal that identifies a configuration for a set of physical random-access channel (PRACH) occasions that are within an association period, individual ones of a first subset of one or more PRACH occasions in the set of PRACH occasions are mapped to synchronization signal block (SSB) transmissions during the association period and individual ones of a second subset of one or more PRACH occasions in the set of PRACH occasions are unmapped to SSB transmissions during the association period. The UE may selectively perform one or more PRACH transmissions during the second subset of one or more PRACH occasions in the set of PRACH occasions according to an availability scheme, the availability scheme defines whether the second subset of one or more PRACH occasions is available or is unavailable for PRACH transmissions.