D2D Proximity Service Access Class Barring Parameters
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Solution Overview
Problem
Current access class barring procedures in wireless communication systems do not effectively consider device-to-device (D2D) proximity service communications, leading to difficulties for UEs in accessing resources during barring conditions, resulting in inconsistent resource allocations.
Innovation Solution
Defining and providing access class barring (ACB) parameters specifically for D2D proximity service communications, which are communicated by a serving base station to UEs, allowing them to identify resource availability based on the assigned ACB parameters and barring conditions, and requesting resources through a radio resource control (RRC) connection request message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current access class barring procedures are used for D2D proximity service communications, then general access control is maintained, but UEs experience difficulty accessing resources for D2D communications when barring is active
Solution Approach 1:
The patent applies local quality by introducing D2D-specific ACB parameters (ac-BarringForD2D-Discovery, ac-BarringForD2D-Communication) that differ from traditional ACB parameters. These localized parameters enable differentiated access control specifically for D2D discovery and communication functions, allowing UEs to access D2D resources even when general access barring is active, thus resolving the contradiction between maintaining general access control and enabling D2D resource access.
2Productivity
If access class barring is active to control network access, then network congestion is reduced, but resource allocation consistency for D2D communications deteriorates
Solution Approach 1:
The patent segments the access control mechanism by introducing separate ACB parameter sets for different D2D functions (discovery vs. communication) and different priority levels. This segmentation allows the network to maintain overall access control through traditional ACB while simultaneously providing consistent, predictable resource allocation for D2D communications through dedicated parameters, resolving the contradiction between network efficiency and allocation consistency.
Solution Approach 2:
The patent changes the ACB parameter structure by adding D2D-specific parameters (ac-BarringForD2D-Discovery, ac-BarringForD2D-Communication, ac-BarringForD2D-Discovery-HighPrio, ac-BarringForD2D-Communication-HighPrio) with specific ranges (0-7 for normal priority, 8-15 for high priority). These parameter changes enable consistent resource allocation decisions based on UE priority and D2D service type, maintaining stability in resource allocation even when access barring is active.
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AI summary
Methods, systems, and devices are described for access class barring (ACB) operations for device-to-device (D2D proximity service communications. An ACB parameter may be defined and assigned to UEs that is associated with discovery or communication operations for normal and high priority user equipments (UEs). The UE may identify a resource for D2D proximity service communications and, when not barred, send a radio resource control (RRC) connection message requesting the available resource. An establishment cause may be defined and included in the RRC connection request message that corresponds to the ACB parameter.