Discovery Channel Power Control for D2D Interference
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Solution Overview
Problem
In device-to-device (D2D) communication systems, particularly in the ProSe system, there is a challenge in minimizing interference with base stations due to differences in transmission power between PUCCH and discovery signals, which affects reception performance and discovery radius.
Innovation Solution
The method involves transmitting PUCCH scheduling information through discovery resources in the discovery channel, allowing user equipment to perform power control only in subframes scheduled for PUCCH signals, thereby minimizing interference with the base station while maintaining discovery signal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If power control is applied to discovery signals to reduce interference with base station, then interference is reduced, but discovery signal reception performance deteriorates
Solution Approach 1:
The discovery channel is divided into two distinct parts: PUCCH resources for uplink control signals and discovery signal resources for device-to-device discovery. This segmentation allows different power control strategies to be applied to each part independently, enabling interference reduction in PUCCH without affecting discovery signal performance.
Solution Approach 2:
Power control is applied selectively only to PUCCH transmissions within the discovery channel, while discovery signals maintain their original transmission power characteristics. This local application of power control ensures that interference reduction is achieved precisely where needed (at the base station) without degrading discovery signal reception at user equipment.
2Object-generated harmful factors
If power control is applied to all discovery signals, then interference with base station is reduced, but discovery radius is reduced
Solution Approach 1:
The transmission resources are segmented into PUCCH-specific resources and discovery signal-specific resources. Power control is enforced only on PUCCH transmissions, allowing discovery signals to maintain sufficient power for adequate discovery radius while still reducing overall interference through the structured resource separation.
Solution Approach 2:
The power control mechanism is applied locally only to uplink control transmissions in scheduled subframes, leaving discovery signal transmissions unaffected. This ensures that the discovery radius is maintained at appropriate levels while interference management is applied precisely where the base station reception is most vulnerable.
3Object-generated harmful factors
If power control is applied in all subframes, then interference with base station is minimized, but system efficiency is reduced due to unnecessary power control operations
Solution Approach 1:
The base station performs preliminary scheduling of PUCCH resources in discovery channel subframes before actual transmissions occur. This preliminary action enables user equipment to know in advance which subframes require power-controlled PUCCH transmissions, allowing the system to apply power control only when necessary and avoid redundant operations in non-scheduled subframes.
Solution Approach 2:
The power control application is made dynamic and adaptive based on actual scheduling decisions. Rather than applying power control uniformly across all subframes, the system dynamically adjusts power control application based on whether PUCCH resources are actually scheduled in each subframe, optimizing system efficiency by eliminating unnecessary power control operations.
Data Source
AI summary
The present disclosure provides a method for performing a cellular communication in a device-to-device communication system, the method comprising the operations of: receiving scheduling to transmit an uplink signal through a specific resource of a discovery channel from a base station; generating uplink scheduling information notifying scheduling of the uplink signal; and transmitting the uplink scheduling information through at least one discovery resource of the discovery channel.