D2D Discovery Resource Partitioning for Interference Control
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Solution Overview
Problem
Current wireless communication systems face challenges in performing efficient discovery procedures between device-to-device (D2D) terminals, particularly in selecting appropriate discovery resources and controlling transmission power in a restricted discovery scheme, leading to increased interference and resource inefficiencies.
Innovation Solution
A method for transmitting discovery messages in a wireless communication system that involves receiving discovery resource region information, determining a discovery resource partition using discovery search information, and selecting a discovery resource through a hash function or greedy/random selection, while controlling the transmission power of the discovery message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If discovery resource partitioning is implemented in restricted discovery scheme, then interference is reduced and resource utilization is improved, but device complexity increases due to hash function computation and partition determination
Solution Approach 1:
The discovery resource region is divided into multiple discovery resource partitions, where each partition is assigned to specific D2D terminals based on their discovery search information. This segmentation reduces interference by ensuring that terminals in different partitions use different resources, while the hash function provides a systematic way to determine partition assignment without excessive complexity.
Solution Approach 2:
The patent uses discovery search information (such as terminal ID or encryption key) as parameters to determine the discovery resource partition through hash function computation. By changing the parameter set used in the hash function, the system can dynamically assign terminals to different partitions, reducing interference while maintaining manageable device complexity through standardized computational procedures.
2Productivity
If discovery resources are selectively chosen using hash function, then resource utilization is improved and unnecessary discovery signals are reduced, but computation time and processing overhead increase
Solution Approach 1:
The discovery search information is pre-shared with specific D2D terminals before the discovery procedure. This preliminary action allows terminals to have the necessary information ready for hash function computation, reducing computation time during the actual discovery process and improving overall resource utilization efficiency.
Solution Approach 2:
The patent employs simple hash function computations rather than complex optimization algorithms. These computationally inexpensive operations can be performed quickly and discarded after use, providing efficient resource selection without significant computation time overhead while improving resource utilization.
3Object-generated harmful factors
If transmission power of discovery message is controlled, then interference to other terminals is reduced, but signal coverage and reliability may be affected
Solution Approach 1:
The patent controls transmission power locally for each discovery message based on the specific communication conditions and partition assignment. By adjusting power levels according to local requirements rather than using uniform high power, the system reduces interference to other terminals while maintaining sufficient signal reliability for the intended receivers.
Data Source
AI summary
A method for transmitting a discovery message in a wireless communication system supporting device-to-device (D2D) direct communication, the method performed by the device, includes: receiving discovery resource region information including multiple discovery resource partitions from a base station; determining one discovery resource partition among multiple discovery resource partitions by using discovery search information previously shared with specific D2D terminals; determining a discovery resource for transmitting a discovery message among discovery resources in the determined discovery resource partition through a predetermined resource selecting method; and transmitting the discovery message through the determined discovery resource.