D2D Resource Control via RRC Barring Indication
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing Device-to-Device (D2D) resources, particularly in scenarios where resource availability is limited, leading to congestion and increased signaling overhead and power consumption.
Innovation Solution
The method involves a network node sending an indication to user equipment (UE) to prohibit the transmission of a Radio Resource Control (RRC) connection request for D2D dedicated resources, allowing the UE to decide based on this indication whether to proceed, and if not, to use contention-based resources or suspend D2D services temporarily, thereby dynamically managing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits RRC connection request messages to establish RRC connection for requesting D2D dedicated resources, then the D2D service can be properly established, but the signaling overhead and power consumption increase
Solution Approach 1:
The network node sends an indication message to the UE in advance to prohibit transmission of RRC connection request messages for D2D dedicated resources. This preliminary action prevents the UE from transmitting unnecessary signaling messages, thereby reducing power consumption while avoiding disruption to legitimate D2D service establishment requests
Solution Approach 2:
The system performs preliminary resource allocation using contention-based resources before dedicated resources are assigned. The UE is configured with contention-based resources in advance, allowing it to transmit D2D signals immediately without waiting for RRC connection establishment, thus reducing power consumption while ensuring service availability
2Reliability
If the UE transmits RRC connection request messages to establish RRC connection for requesting D2D dedicated resources, then the D2D service can be properly established, but the signaling overhead increases
Solution Approach 1:
The network node sends an indication message to the UE in advance to prohibit transmission of RRC connection request messages for D2D dedicated resources. This preliminary action prevents the generation of unnecessary signaling messages, thereby reducing signaling overhead while maintaining the ability to establish D2D services when needed
Solution Approach 2:
The patent extracts the D2D resource request function from the RRC connection establishment procedure. By allowing UE to request and use contention-based D2D resources independently of RRC connection state, the system separates the resource allocation function from the connection management function, reducing unnecessary signaling overhead
3Reliability
If the network allocates D2D dedicated resources to all UEs, then the D2D service quality is improved, but the resource utilization efficiency decreases when resources are not fully utilized
Solution Approach 1:
The system dynamically switches between contention-based and dedicated resource allocation modes based on actual D2D service requirements and network conditions. When D2D services are active, dedicated resources are allocated; when inactive, resources are released for other uses. This dynamic approach ensures high service quality when needed while maximizing resource utilization efficiency when not
Solution Approach 2:
The network changes the resource allocation parameter from static dedicated allocation to dynamic allocation based on service state. By monitoring D2D service establishment and release events, the network adjusts resource allocation parameters in real-time, allocating dedicated resources only when D2D services are active, thereby maintaining service quality while improving overall resource utilization efficiency
Data Source
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AI summary
A method and apparatus of for implementing a D2D service are disclosed. The method includes the UE receiving an indication to prohibit a transmission of a RRC (Radio Resource Control) connection request message for requesting a D2D dedicated resource for transmission. The method further includes the UE deciding whether to prohibit the transmission of the RRC connection request message at least based on the indication. The indication to barr RRC connection requests may differentiate on requests to transmit mobile originated signaling, delay tolerant access and may be included in a system information. The indication may be sent to the UE from the network (preferrably from an eNB) in order to prevent the repeated attempts from the UE to get dedicated resources when the cell is congested. In this way the signalling overhead and UE power consumption is reduced, and moreover, access with high priority can be served properly. In case of barring of requesting dedicated resources, the UE may use D2D contention-based resources. Furthermore, the UE may ignore the prohibition if the transmission is for the purpose of public safety.