D2D Discovery Group Timing for Wireless Communication
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Solution Overview
Problem
Current wireless communication systems face challenges in providing real-time, efficient data transmission and reception, especially with the increasing demand for device-to-device (D2D) services, due to complexity and time delays in existing systems.
Innovation Solution
A method and apparatus for performing D2D communication in a wireless communication system, involving distinguishing between cellular and D2D user equipment, forming discovery groups, configuring discovery timing, and using predetermined time and frequency resources for signal transmission and data exchange, allowing for efficient data transmission and reception without relying on network infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If device-to-device communication is implemented without network infrastructure, then transmission delay is reduced and real-time data exchange is improved, but system complexity increases due to need for discovery groups and timing synchronization
Solution Approach 1:
The system segments user equipment into different discovery groups based on service types or other criteria. Each discovery group operates with its own discovery timing, allowing D2D communication to be organized in manageable units rather than requiring all devices to synchronize simultaneously, thus reducing overall system complexity while enabling real-time communication.
Solution Approach 2:
The patent implements periodic discovery timing for different discovery groups, where each group has predetermined time intervals for D2D discovery and data transmission. This periodic structure provides regular synchronization opportunities, reducing transmission delay for time-sensitive applications while maintaining manageable system complexity through predictable patterns.
2Productivity
If all user equipments perform D2D discovery continuously, then discovery speed is improved, but power consumption increases
Solution Approach 1:
User equipment in idle state performs D2D discovery periodically rather than continuously, with discovery operations scheduled at specific time intervals. This periodic discovery mechanism maintains adequate discovery speed by checking for D2D opportunities regularly while significantly reducing power consumption compared to continuous monitoring and transmission.
Solution Approach 2:
The system dynamically adjusts discovery behavior based on device state. User equipment in idle state uses periodic discovery with longer intervals to conserve power, while equipment in connected state can engage in more frequent discovery activities. This dynamic adaptation allows the system to optimize the balance between discovery speed and power consumption according to actual operational needs.
3Adaptability or versatility
If discovery groups are formed for different services, then service-specific optimization is improved, but device complexity increases due to group management
Solution Approach 1:
The system segments user equipment into distinct discovery groups based on service types or application requirements. Each discovery group can be optimized for its specific service characteristics (e.g., latency requirements, data rates), providing service-specific optimization. The segmentation approach manages complexity by organizing devices into manageable groups rather than requiring individual customization for each device.
Solution Approach 2:
The discovery group mechanism serves multiple functions simultaneously: it enables service-specific optimization, provides timing synchronization, manages resource allocation, and facilitates peer discovery. This multi-functionality reduces the need for separate mechanisms for each function, thereby limiting the increase in overall system complexity while achieving service-specific optimization.
4Reliability
If predetermined time and frequency resources are allocated for D2D discovery, then interference with cellular communication is reduced, but frequency resource efficiency decreases
Solution Approach 1:
The system segments time and frequency resources by creating dedicated discovery resources for D2D operations, separate from resources used for cellular communication. This segmentation prevents interference between D2D discovery signals and cellular traffic by ensuring they operate in dedicated resource blocks, thereby improving reliability.
Solution Approach 2:
D2D discovery operations are scheduled periodically in predetermined time intervals using specific frequency resources. This periodic allocation allows frequency resources to be reused across different time periods and discovery groups, improving overall frequency resource efficiency while maintaining reliable interference-free operation during designated discovery periods.
Data Source
AI summary
The present invention provides a method and an apparatus performing device-to-device (D2D) communication in a wireless communication system. More particularly, D2D terminals supporting D2D communication are identified, discovery groups are formed for the D2D terminals using the same application, and discovery timing is established depending on the discovery group such that D2D terminals belonging to the same discovery group are shifted to an active state during the discovery timing in order to transceive signals by using time and frequency resources designated for D2D discovery with the discovery timing having a variable value depending on the discovery group.