Wireless Random Access for Energy-Efficient SIB1 Acquisition
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing random access procedures for acquiring system information, particularly in power-saving scenarios where network energy efficiency and user equipment (UE) power consumption are critical, without compromising latency and reliability.
Innovation Solution
A method for User Equipment (UE) to determine whether to initiate a random access procedure for requesting System Information Block 1 (SIB1) based on access barring information, using non-contention based and contention based random access procedures, where the purpose or necessity of SIB1 is indicated through specific preambles and PRACH resources, allowing the base station to make informed decisions on providing SIB1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE initiates random access procedure to request SIB1, then the UE can acquire system information, but network energy consumption and UE power consumption increase
Solution Approach 1:
The network performs preliminary actions by broadcasting access barring information and configuring specific preambles/PRACH resources for SIB1 requests before the UE needs to access. This allows the UE to check barring status in advance and only initiate random access when necessary, preventing unnecessary energy consumption while ensuring system information can be acquired when allowed.
Solution Approach 2:
The UE autonomously determines whether to initiate random access by checking access barring information itself, without requiring network intervention for each access decision. The UE uses the configured preambles and barring parameters to self-evaluate access suitability, reducing unnecessary access attempts and thereby reducing both UE power consumption and network energy usage.
2Loss of energy
If the UE checks access barring information before random access, then energy consumption is reduced, but access latency may increase
Solution Approach 1:
The network broadcasts access barring information and configures SIB1 request parameters in advance through system information blocks. The UE performs the barring check using pre-configured parameters rather than waiting for network response, which minimizes the time penalty while still enabling energy-saving decisions.
Solution Approach 2:
The UE performs a partial check (barring information evaluation) rather than completing the full random access procedure when barring is detected. This partial action allows the UE to avoid unnecessary energy consumption while the check itself is designed to be quick using pre-configured parameters, minimizing latency impact.
3Reliability
If specific preambles are used to indicate SIB1 request purpose, then the base station can make informed decisions, but the random access procedure complexity increases
Solution Approach 1:
The patent reuses existing random access preambles and PRACH resources for dual purposes: conventional random access and SIB1 requests. By configuring specific preambles from the existing set for SIB1 requests and using the same random access infrastructure, the patent enables base station recognition of SIB1 request purposes without introducing entirely new signaling mechanisms, thus maintaining procedural simplicity while improving decision accuracy.
Solution Approach 2:
The configured preambles act as intermediaries that carry implicit information about the UE's purpose (SIB1 request). Instead of requiring explicit signaling or complex message exchanges, the preamble selection itself conveys the request type to the base station, simplifying the overall procedure while enabling informed network decisions.
Data Source
AI summary
A method and device for a User Equipment (UE) are disclosed. In one embodiment, the UE determines whether to initiate a random access procedure on a cell to request SIB1 from a base station based on information related to access barring.