RACH Resource Selection With Preamble Power for Uplink Coverage
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Solution Overview
Problem
The uplink coverage bottleneck during random access in 5G wireless communication systems, particularly due to the lack of dedicated configurations, necessitates improved methods for enhancing uplink coverage.
Innovation Solution
A method for determining specific preamble target power based on system information request configuration parameters, including sets of random access channel common configuration parameters, to optimize the random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If message 1 repetition is used for system information request, then uplink coverage is improved, but device complexity increases due to multiple configuration parameter sets
Solution Approach 1:
The patent segments the random access configuration parameters into multiple sets, where each set corresponds to a specific repetition number. The UE selects the appropriate configuration set based on the repetition number indicated by the network, thereby managing complexity through structured division while enabling coverage enhancement through repetition.
Solution Approach 2:
The network pre-configures multiple sets of random access parameters with different repetition numbers before the UE performs random access. The UE determines the appropriate configuration set in advance based on the indicated repetition number, preparing the transmission parameters before actual preamble transmission to ensure optimal coverage performance.
2Reliability
If multiple sets of RACH configuration parameters are configured, then random access performance is improved, but signaling overhead increases
Solution Approach 1:
The patent creates a universal mapping relationship between repetition numbers and configuration set indices that can be applied across different scenarios. The network indicates a single repetition number that universally determines which configuration set the UE should use, eliminating the need for separate signaling for each parameter set and reducing overall signaling overhead.
Solution Approach 2:
The UE autonomously determines the appropriate configuration set index based on the repetition number indication from the network and the pre-established mapping relationship. This self-service mechanism eliminates the need for the network to explicitly signal each configuration set, thereby reducing signaling overhead while maintaining accurate parameter selection.
3Reliability
If preamble target power is optimized for each repetition number, then uplink coverage is enhanced, but processing complexity increases
Solution Approach 1:
The network pre-configures multiple sets of random access parameters with different repetition numbers and associated power settings before the UE performs random access. The UE determines the appropriate configuration set in advance based on the indicated repetition number, preparing the transmission power parameters before actual preamble transmission to ensure optimal coverage performance.
Solution Approach 2:
The patent changes the power parameter based on the repetition number by selecting from pre-configured sets. Each configuration set contains specific power parameters optimized for its corresponding repetition number, allowing the UE to adapt transmission power to coverage conditions without complex real-time calculations.
Data Source
AI summary
A method and apparatus to enhance uplink coverage is provided. Method for enhancing uplink coverage includes receiving a SIB1 in a cell, wherein the SIB1 comprises one or more sets of random access channel (RACH) common configuration parameters, initiating random access procedure for system information request with message 1 repetition, determining a preamble index corresponding to the SI message and performing preamble transmission based on a specific preamble target power. The specific preamble target power is determined based on a first parameter related to preamble target power in a second set of system information request configuration parameters in case that the second set of system information request configuration parameters comprises a set of RACH generic configuration parameters.