SSB to RACH Occasion Mapping Prioritization
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently mapping synchronization signal blocks (SSBs) to random access channel (RACH) occasions (ROs), especially in scenarios with non-uniform quantities of RACH occasions per SSB or non-uniform repetitions per SSB, which can lead to energy inefficiencies and synchronization issues between user equipment (UE) and network nodes.
Innovation Solution
The proposed solution involves a method where user equipment (UE) selects an SSB and its associated RACH occasion based on a prioritization rule or a configured mapping order. This approach ensures that each SSB has a minimum number of mapped RACH occasions, with any remaining occasions mapped in a specific order, thereby maintaining synchronization and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-uniform quantities of RACH occasions are allocated per SSB, then resource allocation flexibility is improved, but synchronization reliability deteriorates
Solution Approach 1:
The patent applies local quality by configuring different mapping relationships between SSBs and ROs based on local conditions. Specifically, different SSBs can be mapped to different numbers of ROs according to their individual qualities (e.g., beam qualities, coverage areas), allowing flexible resource allocation while maintaining proper synchronization through configured mapping rules.
Solution Approach 2:
The patent changes the mapping parameters between SSBs and ROs dynamically. By adjusting the number of ROs per SSB and the mapping order based on network configuration and traffic conditions, the system achieves both flexibility in resource allocation and reliability in synchronization through controlled parameter variations.
2Use of energy by moving object
If non-uniform repetitions per SSB are used, then energy efficiency is improved, but mapping complexity increases
Solution Approach 1:
The patent introduces dynamic mapping where the number of repetitions and the mapping relationship between SSBs and ROs can be adjusted based on network conditions, UE capabilities, and traffic requirements. This dynamic configuration allows energy efficiency improvements while managing complexity through standardized procedures and network-controlled parameters.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the mapping relationships between SSBs and ROs through network signaling before actual random access occurs. This pre-configuration approach allows the system to optimize energy efficiency in advance while providing clear, predetermined mapping rules that reduce runtime complexity for both network and UE.
3Productivity
If prioritization rules are applied for SSB selection, then access efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the random access process by introducing prioritization rules that divide SSB selection into different priority levels. This segmentation allows efficient access by guiding UEs to select from high-priority SSBs first, improving access efficiency while managing complexity through structured, hierarchical selection criteria defined by network configuration.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a set of synchronization signal block (SSB) communications, wherein a plurality of SSB communications, of the set of SSB communications, satisfy a threshold for a measurement value. The UE may transmit, in a random access channel (RACH) occasion (RO) corresponding to an SSB communication, of the plurality of SSB communications, a RACH communication in accordance with an SSB prioritization. Numerous other aspects are described.