RAN Broadcast Segmentation for Inter-System Mobility
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Solution Overview
Problem
Existing cellular networks face inefficiencies in broadcasting RAN assistance information, leading to unnecessary UE wake-ups and increased load on paging channels, particularly when dealing with frequently changing parameters and legacy devices that cannot support frequent updates.
Innovation Solution
The implementation of novel broadcast procedures that differentiate between frequently and infrequently changing RAN assistance information parameters, using system information blocks and paging messages to optimize transmission and minimize battery waste, while ensuring backward compatibility and efficient network operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cellular networks broadcast RAN assistance information frequently to support inter-system mobility, then network selection and traffic steering operations are improved, but UE battery consumption increases and paging channel load increases
Solution Approach 1:
The patent segments RAN assistance information into two categories: frequently changing parameters (FCP) and infrequently changing parameters (ICP). FCP are broadcast immediately when changed, while ICP are bundled and broadcast periodically. This segmentation allows the network to provide timely updates for mobility-critical parameters without forcing UEs to wake up for every parameter change, thereby reducing battery consumption while maintaining inter-system mobility support.
Solution Approach 2:
The patent implements periodic broadcasting for infrequently changing parameters (ICP) such as WLAN threshold and hysteresis parameters. Instead of broadcasting these parameters immediately when changed, the network bundles them and transmits them at scheduled intervals. This periodic action reduces the frequency of UE wake-ups and paging channel load while still providing necessary updates for network selection and traffic steering operations.
2Loss of information
If cellular networks broadcast all RAN assistance information updates immediately, then information freshness is improved, but paging channel load increases
Solution Approach 1:
The patent divides RAN assistance information into frequently changing parameters (FCP) and infrequently changing parameters (ICP). FCP such as RAN load and signal strength parameters are broadcast immediately when changed to maintain information freshness. ICP such as WLAN thresholds are bundled and broadcast periodically to reduce paging channel load. This segmentation strategy balances information freshness requirements with paging channel capacity constraints.
Solution Approach 2:
The patent merges multiple infrequently changing parameters (ICP) into bundled updates transmitted at periodic intervals. Instead of sending each ICP update separately, the network combines them into single broadcast messages, thereby reducing the total number of paging channel transmissions and lowering overall paging channel load while still providing comprehensive parameter updates.
3Adaptability or versatility
If cellular networks support both legacy and advanced UEs with different broadcast capabilities, then device compatibility is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal broadcast framework that simultaneously supports legacy UEs and advanced UEs with inter-system mobility capabilities. The same broadcast mechanism handles both FCP and ICP, and both legacy and advanced UEs can process the broadcasts according to their capabilities. Advanced UEs can utilize the differentiated update strategy while legacy UEs receive comprehensive updates, achieving multi-functionality without requiring separate broadcast systems.
Solution Approach 2:
The patent applies different update strategies to different parameter types based on their characteristics. Frequently changing parameters receive immediate updates suitable for mobility-critical operations, while infrequently changing parameters receive periodic updates. This local quality approach allows the system to optimize for each parameter type's requirements while maintaining a unified broadcast infrastructure, reducing overall system complexity.
Data Source
AI summary
Methodologies and apparatus to support interworking operations between a cellular radio area network (RAN) and a wireless local area network (WLAN) utilizing broadcast RAN assistance information. In various embodiments, a RAN (such as a LTE/LTE-advanced RAN) transmits RAN assistance information to a multimode user equipment (UE) for use in network selection and traffic steering operations. Certain parameters, such as RAN load assistance information, may be transmitted in a first format or a second, less granular format that changes relatively infrequently over time as compared to the first format. A system information broadcast procedure utilizing a paging message is employed to transmit information in the second format. The paging message may include a change notification flag that triggers a UE to initiate a system information acquisition procedure to a retrieve system information message(s) including the relevant interworking parameters.