D2D Communication Bypass Mechanism for Network Access Control
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Solution Overview
Problem
In wireless communication systems, device-to-device (D2D) communication quality is compromised when user equipment (UEs) are out of coverage areas of eNBs, due to access barring or back-off timers, preventing successful tracking area updates and mode 1 resource allocations.
Innovation Solution
A communication device and method that receive a barring signal from a first base station and bypass it to initiate a D2D communication procedure with a second base station, prioritizing D2D communication to improve quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access barring is applied to prevent network overload, then network stability is improved, but D2D communication quality deteriorates when UEs need to update tracking area or allocate resources
Solution Approach 1:
The patent changes the parameter state of access barring from a blocking condition to a bypassable condition specifically for D2D procedures. When a UE receives access barring information, it normally would be blocked from initiating procedures, but the invention allows the UE to bypass this barring for D2D-specific procedures (tracking area update, resource allocation) by detecting the barring parameter and selectively ignoring it for these critical D2D operations, thereby maintaining network stability while enabling D2D communication quality
Solution Approach 2:
The patent segments the access control mechanism into general access barring and D2D-specific access permissions. By dividing the access control into separate controllable elements, the system can apply barring to general network access while simultaneously permitting D2D procedures, thus resolving the contradiction between maintaining network stability through barring and ensuring D2D communication quality through selective access permission
2Ease of operation
If mode 2 resource allocation is used for D2D communication, then UE autonomy is improved, but communication quality deteriorates when UEs are out of coverage areas
Solution Approach 1:
The patent implements a dynamic resource allocation mechanism that allows UEs to transition between mode 2 (autonomous) and mode 1 (network-controlled) allocation based on their coverage status and D2D communication needs. When UEs are out of coverage, they can operate in mode 2 with full autonomy, but when they enter coverage areas and need to initiate procedures like tracking area updates, the system dynamically enables mode 1 allocation through the bypass mechanism, thereby adapting the allocation mode to current operational requirements and maintaining communication quality
3Loss of energy
If back-off timer is enforced to control access, then network load is reduced, but D2D communication initialization deteriorates when UEs need to enter coverage areas
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the UE with the ability to bypass back-off timer restrictions for D2D procedures before the timer would normally block access. When a UE receives back-off timer information from the network, it stores this parameter but is pre-equipped with the capability to ignore it when initiating D2D procedures such as tracking area updates or resource allocations, thus preventing the timer from blocking critical D2D initialization while still allowing it to function for general network access control
Data Source
AI summary
A communication device for handling a device-to-device (D2D) communication comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The storage unit is configured to execute the instructions stored in the storage unit. The instructions comprise receiving a barring in a signalling transmitted by a first base station; and bypassing the barring to initiate a procedure for the D2D communication to a second base station.