On-Demand SIB Requesting for Radio Resource-Efficient Broadcast
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Solution Overview
Problem
The increasing number of system information blocks in wireless communication systems necessitates efficient utilization of radio resources for their transmission, as the quantity of required radio resources grows with the number of blocks, posing a challenge in effectively broadcasting all necessary information to user equipment.
Innovation Solution
A method and apparatus for user equipment (UE) to request a missing system information block (SIB) by receiving an SIB list and broadcast information from the radio access network, detecting missing SIBs, and requesting them specifically from the RAN, utilizing probability factors, value tags, and SIB sets to optimize resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of system information blocks is increased to provide more services and information, then the system capability and service coverage are improved, but the quantity of radio resources required for broadcasting increases
Solution Approach 1:
The system information blocks are segmented into two categories: minimum SIBs that are always broadcast, and optional SIBs that are broadcast only when requested. This segmentation allows the system to maintain comprehensive service capability while reducing routine radio resource consumption by only transmitting essential information periodically.
Solution Approach 2:
The broadcasting behavior of SIBs is made dynamic through the on-demand mechanism. The RAN adapts its transmission behavior based on actual UE requests, switching between broadcast and unicast modes. This dynamic approach optimizes radio resource utilization by transmitting information only when needed rather than following a fixed broadcast schedule.
2Reliability
If all SIBs are broadcast in every BCCH period to ensure complete information delivery, then the reliability of information delivery is improved, but the radio resource consumption increases
Solution Approach 1:
The UE performs preliminary actions by monitoring SIB broadcast information and detecting missing SIBs before requesting them. The RAN preliminarily identifies which SIBs are not being broadcast and prepares to transmit them via unicast upon receiving UE requests, ensuring reliable delivery without redundant broadcasting.
Solution Approach 2:
An on-demand feedback mechanism is implemented where UEs monitor broadcast SIBs, detect missing information, and send requests to the RAN. The RAN responds by transmitting the requested SIBs via unicast. This feedback loop ensures reliable information delivery while optimizing resource usage by transmitting only what is actually needed.
3Loss of information
If the RAN broadcasts all possible SIBs continuously to ensure UEs have all information, then the completeness of system information is improved, but the efficiency of radio resource utilization deteriorates
Solution Approach 1:
The patent extracts the essential SIBs that must always be broadcast (minimum SIBs) and separates them from optional SIBs. The optional SIBs are taken out of the continuous broadcast stream and made available through on-demand unicast transmission, improving resource utilization while maintaining information completeness.
Solution Approach 2:
The system transitions from a static continuous broadcast model to a dynamic hybrid model. The RAN dynamically adjusts transmission methods based on UE requests, broadcasting minimum SIBs continuously while providing optional SIBs through targeted unicast transmissions, thereby optimizing resource utilization efficiency.
Data Source
AI summary
Provided are a method for a terminal for requesting a system information block (SIB), and an apparatus for supporting the method in a wireless communication system. The method may comprise the steps of: receiving, from a radio access network (RAN), an SIB list comprising one or more SIBs supported by a cell; receiving, from the RAN, SIB broadcast information indicating whether the SIB supported by the cell is broadcast in a broadcast control channel (BCCH) section; detecting an omitted SIB on the basis of the SIB list and SIB broadcast information; and requesting the omitted SIB from the RAN.