RACH Default Parameter Selection Across Terrestrial and NTN Networks
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Solution Overview
Problem
Existing wireless communication systems face challenges in configuring default parameters for random access channel (RACH) procedures that are effective across different network types, such as terrestrial and non-terrestrial networks, without increasing the payload size of system information, which can lead to failed RACH procedures and delayed access.
Innovation Solution
Preconfigure multiple sets of default parameters for different network types within the user equipment (UE) and provide an indication of which set to use for the RACH procedure, rather than including them in system information, thereby minimizing payload size impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If default parameters for RACH procedures are included in system information, then all UEs can obtain them, but payload size increases and parameters may not be optimal for different network types
Solution Approach 1:
The patent segments default parameters into multiple sets, each optimized for specific network types (e.g., terrestrial vs. non-terrestrial networks). Instead of including all parameters in system information, the network provides only the set relevant to the current network type, reducing payload size while maintaining optimal parameters for RACH procedures.
Solution Approach 2:
The patent pre-configures multiple sets of default parameters in the UE before network access, with each set tailored for specific network types. The UE selects the appropriate pre-configured set based on network type indicators, eliminating the need to transmit all parameters in system information and reducing payload size.
2Quantity of substance
If a single set of default parameters is used for all network types, then system information payload size is minimized, but RACH procedure reliability decreases for specific network types
Solution Approach 1:
The patent applies local quality by providing different default parameter sets optimized for specific network types rather than using a uniform set for all networks. The network indicates which parameter set to use based on local network characteristics (e.g., NTN-specific parameters for non-terrestrial networks), ensuring optimal RACH performance for each network type while keeping individual parameter sets compact.
Solution Approach 2:
The patent changes parameters based on network type by maintaining multiple sets of default parameters with different configurations (e.g., different time advance values, power control parameters, or RACH occasion configurations) and selecting the appropriate set according to whether the network is terrestrial or non-terrestrial, thereby optimizing RACH procedures for each network type.
3Adaptability or versatility
If multiple sets of default parameters are provided in system information, then optimal parameters for different network types are available, but payload size and complexity increase
Solution Approach 1:
The patent pre-configures multiple sets of default parameters in the UE before network access, with each set tailored for specific network types. The network provides only a compact indicator (e.g., a flag or index) to select which pre-configured set to use, rather than transmitting all parameters for all network types, thereby maintaining high adaptability while minimizing system information payload size and complexity.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for configuring default system information for different network types. An example method, performed by a user equipment (UE), may include obtaining information indicating which set of default parameters, from two or more different sets of default parameters associated with different network types, to use for performing a random access channel (RACH) procedure and performing the RACH procedure with a network entity using the indicated set of default parameters.