D2D Discovery Signaling Interference Management in Wireless Systems
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Solution Overview
Problem
Current device-to-device (D2D) discovery methods in wireless communication systems face challenges in efficiently preventing interference between interfaces during D2D discovery, particularly when user equipment (UE) performs discovery in the RRC idle state, where the network lacks control over radio transmission.
Innovation Solution
A method for transmitting D2D discovery signals in a wireless communication system, where a UE supports D2D discovery in both RRC idle and connected states, allowing efficient interference management by controlling radio resource utilization, especially in the RRC connected mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If D2D discovery is performed in RRC idle state, then device discovery autonomy is improved, but interference control capability deteriorates
Solution Approach 1:
The patent applies dynamics by allowing UEs to transition between RRC idle and RRC connected states based on D2D discovery needs. The network can dynamically control whether UEs perform discovery in idle or connected state, enabling flexible adaptation between autonomy and control requirements for different scenarios
Solution Approach 2:
The patent introduces the network (eNB) as an intermediary that provides discovery resource configuration information to UEs. This intermediary enables the network to maintain control over interference management even when UEs perform autonomous discovery in idle state, by mediating through resource allocation and configuration
2Reliability
If D2D discovery is performed in RRC connected state, then interference control is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the D2D discovery mechanism to function across both RRC idle and RRC connected states. The same discovery procedures and resource allocation principles apply regardless of UE state, reducing the need for separate complex protocols for each state and simplifying overall system design
3Reliability
If network controls radio transmission during D2D discovery, then interference management is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by having the network provide D2D discovery resource configuration information in advance to UEs. This allows UEs to autonomously perform discovery using pre-configured resources without requiring continuous network control or additional signaling during the actual discovery process, thus reducing signaling overhead while maintaining interference management
Data Source
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AI summary
A method and apparatus for performing device-to-device (D2D) discovery in a wireless communication system is provided. A first user equipment (UE), which supports proximity services (ProSe), transmits a request of D2D discovery to a network, and receives information on a second UE, which supports the ProSe and is located in proximity of the first UE, and information on D2D discovery signaling. The first UE performs D2D discovery based on the received information on the second UE and information on D2D discovery signaling.