Relay Access Barring Parameter Modification
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Solution Overview
Problem
Current access barring techniques in 3GPP LTE communications systems face challenges in effectively managing access class barring and enhanced access class barring, particularly in scenarios involving indirect communications, where relay devices and remote devices need to enforce barring parameters based on different access classes and service types, leading to complexities in connection establishment procedures.
Innovation Solution
The system and method involve a relay device modifying barring parameters associated with access class barring types, such as setting indications to false values or omitting certain fields, and forwarding these modified parameters to remote devices, while remote devices detect changes in service types and reacquire current barring parameters, ensuring appropriate barring enforcement based on the device's access class or service type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay devices forward barring parameters unchanged in indirect communication scenarios, then existing technical standards are maintained, but access class barring enforcement becomes inaccurate for relayed connections
Solution Approach 1:
The patent applies local quality by modifying barring parameters specifically for indirect communication scenarios while leaving direct communication parameters unchanged. The relay device identifies when it is operating in relay mode and selectively modifies ACB and EAB parameters only for remote UEs, maintaining original parameters for direct connections. This localized modification approach ensures accurate barring enforcement where needed without unnecessarily complicating the overall system.
Solution Approach 2:
The relay device acts as an intermediary between the network and remote UEs, modifying barring parameters as they pass through the relay. The relay device receives system information blocks containing barring parameters, modifies the ACB and EAB parameters specifically for indirect connections, and forwards the modified parameters to remote UEs. This intermediary role allows the relay to enforce appropriate barring policies for relayed connections while maintaining compatibility with network-wide barring policies.
2Reliability
If relay devices modify all barring parameters, then accurate barring enforcement is achieved, but connection establishment procedures become complex
Solution Approach 1:
The patent segments the barring parameters into different categories: ACB (Access Class Barring) and EAB (Enhanced Access Class Barring) parameters are modified for indirect connections, while other barring parameters remain unchanged. The relay device selectively modifies only the necessary parameters (ac-BarringFactor, ac-BarringThreshold, eab-BarringFactor, eab-BarringThreshold) and leaves other system information intact. This segmentation approach maintains connection establishment simplicity while achieving accurate barring enforcement for the specific parameters that matter in relay scenarios.
3Reliability
If remote devices continuously reacquire barring parameters, then current barring status is maintained, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by having the relay device pre-modify the ACB and EAB barring parameters before forwarding them to remote UEs in system information blocks. Instead of requiring remote devices to continuously query and reacquire parameters, the relay proactively provides updated barring information in advance through modified system information broadcasting. This allows remote devices to maintain current barring status without excessive signaling, as the relay periodically updates the modified parameters in system information blocks.
Data Source
AI summary
A method for performing access barring includes receiving barring parameters, modifying a subset of the barring parameters associated with an access class barring type, and forwarding the modified subset of the barring parameters to a remote device.