Uplink Resource Management for D2D Communication in LTE
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently managing uplink transmission resources, particularly when legacy and advanced user equipment coexist, leading to potential interference and inefficient resource utilization due to static resource allocation.
Innovation Solution
A method where user equipment receives information on subframes designated for dedicated usage and those disabled for specific operations, allowing dynamic switching between uplink transmission and alternative usages like direct communication between devices, thereby optimizing resource allocation and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static resource allocation is used to ensure stable uplink transmission, then reliability is improved, but adaptability deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation by allowing user equipment to switch between uplink transmission mode and direct communication mode based on real-time conditions. The base station dynamically assigns resource blocks and notifies user equipment of usage changes, enabling the system to adapt resource allocation from static to dynamic, thereby improving both reliability and adaptability simultaneously
2Reliability
If dedicated uplink resources are allocated to ensure reliable transmission, then reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent enables resource blocks to serve multiple functions by allowing them to be used for either uplink transmission or direct communication between user equipments. The base station can dynamically allocate the same resource blocks for different purposes based on traffic demands, making the resources universal and improving overall utilization efficiency while maintaining transmission reliability through appropriate mode selection
3Productivity
If resource allocation is optimized for advanced user equipment, then productivity is improved, but ease of operation deteriorates
Solution Approach 1:
The patent segments user equipment into legacy devices and advanced devices with direct communication capabilities. The base station applies different resource allocation strategies to each segment: legacy equipment receives traditional scheduled uplink resources, while advanced equipment can utilize both scheduled resources and direct communication resources. This segmentation allows optimized resource allocation for advanced devices without complicating the operation of legacy devices
4Adaptability or versatility
If direct communication between user equipments is enabled, then adaptability is improved, but interference increases
Solution Approach 1:
The patent applies local quality by allowing direct communication only in specific resource blocks designated for this purpose, while other resource blocks maintain traditional uplink transmission. The base station dynamically selects which resource blocks are suitable for direct communication based on interference conditions, user locations, and traffic demands. This localized application of direct communication mode reduces overall interference while maintaining adaptability
Data Source
AI summary
A method for transmitting a device-to-device (D2D) signal for a D2D link at a user equipment (UE) in a wireless communication system includes determining whether or not to transmit the D2D signal using an uplink resource pool assigned for the D2D link to the UE based on a predetermined probability, wherein any uplink resource overlapping with resources for a physical random access channel (PRACH) is excluded from the uplink resource pool, and when it is determined to transmit the D2D signal, selecting a resource randomly from the uplink resource pool, and transmitting the D2D signal using the selected resource to a target UE.