System Information Request Using UE Msg1 Repetitions
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Solution Overview
Problem
The increasing demand for wireless data traffic in 5G communication systems necessitates improved radio interface efficiency and coverage, particularly in higher frequency bands, where beamforming and advanced antenna technologies are employed, but existing system information request mechanisms are inefficient, especially when random access channel occasions are not explicitly configured.
Innovation Solution
A user equipment (UE) is configured to select an initial uplink bandwidth part (BWP) and initiate a random access procedure with N message 1 (Msg1) repetitions, determining RACH occasions for system information requests based on expected parameters from a RACH common configuration if explicit configurations are absent, enhancing the system information request process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE follows existing system information request mechanisms without Msg1 repetitions, then the procedure is simpler, but the efficiency and reliability of system information requests deteriorate in 5G networks
Solution Approach 1:
The patent applies preliminary action by configuring the UE to perform Msg1 repetitions before the random access response is received. The UE is pre-configured with repetition parameters and automatically executes multiple transmission attempts without requiring explicit RACH occasion configurations, thereby improving request efficiency while managing complexity through advance setup
Solution Approach 2:
The patent implements continuity of useful action through Msg1 repetitions where the UE continuously transmits the random access preamble multiple times (N repetitions) within a defined window period. This continuous transmission ensures that system information requests are reliably delivered even if individual transmissions fail, directly addressing the efficiency improvement goal
2Reliability
If explicit RACH occasions are configured for SI request, then the transmission timing is more precise, but the configuration complexity increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously determine RACH occasion timing based on its own configuration parameters without requiring explicit network-provided RACH occasion configurations. The UE calculates appropriate transmission times based on the configured repetition parameters and network timing information, thereby maintaining reliability while reducing configuration complexity
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting transmission parameters based on the received configuration. The UE modifies timing parameters, repetition counts, and transmission scheduling based on the configured SI request parameters and network conditions, allowing reliable transmission without fixed explicit RACH occasions
3Reliability
If N Msg1 repetitions are implemented, then the system information request reliability improves, but the transmission time increases
Solution Approach 1:
The patent implements periodic action by scheduling Msg1 repetitions at regular intervals within a defined time window. The UE transmits the random access preamble periodically (N times) with controlled intervals, ensuring reliable delivery while managing transmission time through structured periodic repetition rather than continuous or random transmission
Solution Approach 2:
The patent maintains continuity of useful action through overlapping transmission windows where multiple Msg1 repetitions can be transmitted in close temporal proximity. The repetition window is designed to minimize total duration while ensuring sufficient time for each transmission, thereby maintaining reliability without excessive time loss
Data Source
AI summary
A method of operating a UE includes receiving a message including at least one configuration for an initial UL BWP, selecting an initial UL BWP, and initiating an RA procedure for an SI request with N Msg1 repetitions on the selected initial UL BWP. The method also includes selecting an RA configuration, determining whether an SI request configuration for the SI request with N Msg1 repetitions includes a RACH occasions for SI IE, and if the SI request configuration for the SI request with N Msg1 repetitions does not include the RACH occasions for SI IE, applying a configuration of corresponding parameters expected in the RACH occasions for SI IE to determine RACH occasions for transmitting an SI request with N Msg1 repetitions on the selected initial UL BWP. The configuration of corresponding parameters is from a RACH common configuration IE of the selected RA configuration.