D2D Signal Resource Allocation in Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in efficiently transmitting signals for direct communication between terminals without interfering with wide area network (WAN) uplink signal transmissions, due to resource allocation conflicts and limited power and timing constraints.
Innovation Solution
A method and apparatus that select and reselect resource units for direct communication between terminals, prioritizing direct communication signals over WAN uplink signals when collisions occur, and dynamically adjusting resource allocation to avoid interference, allowing for efficient transmission of discovery signals and data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource units are allocated for direct communication between terminals, then direct communication efficiency is improved, but resource allocation conflicts with WAN uplink signals occur
Solution Approach 1:
The resource pool is segmented into multiple resource units, and the terminal selects specific resource units for direct communication based on availability detection. This segmentation allows the system to allocate resources for direct communication without completely conflicting with WAN uplink resources, as different resource units can be independently managed and assigned.
Solution Approach 2:
The terminal dynamically adjusts its resource selection by first assuming all resource units are available, then detecting actual availability by attempting reception, and finally selecting only those resource units that are confirmed available. This dynamic adaptation resolves conflicts between direct communication and WAN uplink transmissions by avoiding occupied resource units.
2Productivity
If terminal selects resource units assuming all are available, then resource utilization is maximized, but signal interference with WAN uplink occurs
Solution Approach 1:
The terminal performs a preliminary availability check by attempting to receive a signal from the base station on each resource unit before selecting it for direct communication. This preliminary action identifies which resource units are actually available (not occupied by WAN uplink transmissions), allowing the terminal to select only safe resource units and avoid signal interference while still maximizing resource utilization among available units.
3Reliability
If direct communication signals are prioritized over WAN uplink signals, then direct communication reliability is improved, but WAN uplink transmission may be affected
Solution Approach 1:
The base station signal acts as an intermediary indicator to determine resource unit availability. By attempting to receive the base station signal on each resource unit, the terminal uses this intermediary measurement to infer whether the resource unit is occupied by WAN uplink transmissions. This intermediary approach allows prioritization of direct communication on available resources without directly interfering with WAN uplink transmissions, as the base station signal presence indicates WAN uplink occupation.
Data Source
AI summary
A method for configuring a resource for transmitting a D2D (device-to-device) signal in a wireless communication system, the method including selecting a resource from a resource pool comprising a set of resources for transmitting the D2D signal, when the selected resource is scheduled for WAN (wide area network) signal, dropping only one of the WAN signal and the D2D signal based on whether the selected resource is a resource related to a UE (user equipment) or not, wherein if the selected resource is related to the UE, dropping the WAN signal, and transmitting the D2D signal in the selected resource.