Legacy-Aware PRACH Configuration Inheritance
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Solution Overview
Problem
Transmitting both legacy and additional PRACH configurations in their entirety results in high signaling overhead due to the inclusion of multiple parameters, which can be inefficient and complex for user equipment (UE) processing.
Innovation Solution
Implementing a PRACH configuration restriction that allows the second PRACH configuration to include the first PRACH configuration as a subset, where parameters of the second PRACH configuration are derived from and restricted by the first PRACH configuration, reducing the need for explicit indication of all parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If both legacy and additional PRACH configurations are transmitted in their entirety, then complete configuration information is provided to UE, but signaling overhead increases
Solution Approach 1:
The patent extracts only the additional parameters that differ from the legacy configuration, rather than transmitting the complete additional configuration. The network node identifies parameters specific to the additional PRACH configuration (such as additionalRO-StartSymbol, additionalRO-NumSymbols, additionalRO-StartPRB, additionalRO-NumPRBs) and transmits only these extracted differences, reducing signaling overhead while maintaining information completeness.
Solution Approach 2:
The patent implements a nested structure where the additional PRACH configuration contains the legacy configuration as a subset. The additional configuration is structured with fields indicating which parameters are inherited from the legacy configuration and which are new or modified. This nested organization allows the UE to efficiently combine the inherited parameters with the explicitly transmitted additional parameters to reconstruct the complete configuration.
2Loss of information
If both legacy and additional PRACH configurations are transmitted in their entirety, then all parameters are explicitly indicated, but UE processing complexity increases
Solution Approach 1:
The patent segments the PRACH configuration transmission into two distinct parts: (1) parameters inherited from the legacy configuration, indicated through inheritance flags or references, and (2) additional parameters specific to the new configuration. This segmentation allows the UE to process only the relevant portions rather than handling complete duplicate configurations, reducing processing complexity while ensuring no parameter information is lost.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary additional parameters rather than the complete configuration. The network node determines which parameters need to be explicitly signaled versus which can be inherited, transmitting only the minimal set required to define the additional configuration. This partial transmission approach reduces UE processing burden while maintaining complete configuration information.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. A user equipment (UE) may receive, from a network node, a first physical random access channel (PRACH) configuration index associated with a first PRACH configuration. The first PRACH configuration may be a legacy PRACH configuration. The UE may receive, from the network node, a second PRACH configuration index associated with a second PRACH configuration. The second PRACH configuration may be associated with a PRACH adaptation or subband full duplex-aware UEs. The second PRACH configuration may be associated with the first PRACH configuration in accordance with a PRACH configuration restriction. The PRACH configuration restriction may restrict parameters of the second PRACH configuration based at least in part on parameters of the first PRACH configuration, such that the second PRACH configuration includes the first PRACH configuration as a subset.