D2D Resource Allocation in RRC Idle Mode Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly LTE, lack efficient methods for device-to-device (D2D) operation, especially in radio resource control (RRC) idle mode, which hinders direct communication capabilities essential for public safety networks requiring stringent reliability and security.
Innovation Solution
A method for controlling D2D operations and resource allocation based on RRC states, allowing D2D signals to be transmitted using D2D resources in both RRC idle and connected modes, with network configuration determining the validity and applicability of these resources across different RRC states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented in LTE system, then direct communication capability and resource efficiency are improved, but system complexity and resource management difficulty increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting resource allocation parameters based on RRC state transitions. When UE transitions between RRC idle and connected modes, the system modifies resource allocation parameters (such as resource pool configuration, scheduling parameters) to match the current operational state, thereby simplifying resource management while maintaining D2D communication capability across different states
Solution Approach 2:
The patent segments resource management by defining separate resource pools and allocation mechanisms for different RRC states (idle and connected modes). This segmentation allows independent optimization of resource allocation strategies for each state, reducing overall system complexity by handling resource management in discrete, state-specific blocks rather than as a monolithic system
2Adaptability or versatility
If D2D resources are allocated for both RRC idle and connected modes, then communication flexibility is improved, but resource allocation overhead increases
Solution Approach 1:
The patent implements universality by creating a unified resource allocation framework that serves both RRC idle and connected modes through common resource pools. The same resource pool can be utilized by UEs in either state, eliminating the need for completely separate resource allocations and thereby reducing overhead while maintaining flexibility for both operational modes
3Productivity
If network configures D2D resources dynamically, then resource utilization efficiency is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring D2D resource pools and allocation parameters during network initialization or earlier RRC states. Resource pool configurations, including physical resource blocks, time-frequency structures, and basic allocation rules, are established in advance so that when UEs need D2D resources, they can be allocated quickly from pre-prepared configurations rather than requiring complete real-time setup, thereby reducing signaling overhead while maintaining dynamic utilization efficiency
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
A method and apparatus for using resources for a device-to-device (D2D) operation in a wireless communication system is provided. A user equipment (UE) receives D2D resources used for transmission of D2D signals in radio resource control (RRC) idle mode, and transmits the D2D signals by using the D2D resources in the RRC idle mode. The D2D resources may be used in the RRC idle mode only, or may be used after entering the RRC connected mode. Alternatively, the UE receives D2D resources used for transmission of D2D signals in RRC connected mode, and transmits the D2D signals by using the D2D resources in the RRC idle mode.