Conditional MIB Acquisition for 5G Handover Delay Reduction
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Solution Overview
Problem
The acquisition of the master information block (MIB) before initiating random access on a target cell in 5G wireless communication systems increases delay, leading to data interruptions during handovers and secondary cell group additions.
Innovation Solution
A method where a terminal identifies the availability of the target cell's timing and PRACH association period, determining whether to initiate random access before receiving and decoding the physical broadcast channel (PBCH) based on these criteria, and only acquiring MIB and PBCH if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MIB acquisition is performed before initiating random access on target cell, then system information is ensured to be available, but handover delay increases leading to data interruptions
Solution Approach 1:
The terminal performs preliminary identification of timing availability and PRACH association period before deciding on MIB acquisition. By checking whether timing is available and whether PRACH association period exceeds one radio frame in advance, the system determines if MIB acquisition is truly necessary, thereby avoiding unnecessary delays while ensuring system information is available when required for random access procedure
Solution Approach 2:
The invention changes the decision parameter from mandatory MIB acquisition to conditional MIB acquisition based on timing availability and PRACH association period. By introducing conditional logic that evaluates specific parameters (timing availability, PRACH association period > 1 radio frame), the system adapts the MIB acquisition process to actual needs, reducing unnecessary operations and associated delays
2Reliability
If MIB and PBCH are always acquired before random access, then communication reliability is improved, but procedure complexity and processing overhead increase
Solution Approach 1:
The terminal divides the handover procedure into distinct stages: first identifying timing availability and PRACH association period, then conditionally proceeding to MIB/PBCH acquisition only when necessary. This segmentation separates the mandatory identification steps from the optional acquisition steps, reducing overall procedure complexity by eliminating unnecessary operations while maintaining reliability when conditions require it
3Speed
If conditional MIB acquisition is implemented based on timing and PRACH association period, then handover speed is improved, but risk of insufficient system information may increase
Solution Approach 1:
The terminal uses feedback from the identification results of timing availability and PRACH association period to control the MIB acquisition process. When timing is unavailable or PRACH association period exceeds one radio frame, the system triggers MIB acquisition to ensure sufficient system information. This feedback mechanism balances speed improvement with reliability assurance, acquiring information only when conditions indicate it is necessary
Data Source
AI summary
A communication method and a system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system include intelligent services based on the 5G communication technology and the IoT-related technology. A method by a terminal for performing a random access procedure upon handover in a wireless communication system is provided. The method comprises identifying at least one of whether timing of a target cell is available or whether a physical random access channel (PRACH) association period is greater than one radio frame, determining whether to initiate a random access procedure on the target cell before receiving and decoding a physical broadcast channel (PBCH) of the target cell based on the identification, and performing the random access procedure based on the determination.