D2D Radio Resource Segmentation for Cellular Interference Control
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Solution Overview
Problem
Current mobile communication systems lack specifications for effectively controlling Device-to-Device (D2D) communication, making it difficult for D2D to coexist with cellular communication due to interference issues.
Innovation Solution
A mobile communication system that regulates the use of specific radio resources in D2D communication by either prohibiting their use or reducing transmission power, allowing D2D to utilize parts of uplink or downlink radio resources without disrupting cellular communication, thereby controlling interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication uses uplink radio resources of cellular communication, then resource utilization is improved, but interference to cellular communication occurs
Solution Approach 1:
The patent segments the uplink radio resources by identifying specific resources (PRACH, PUCCH, PUSCH with uplink reference signals) that must be excluded from D2D communication. This segmentation allows D2D to use other uplink resources while protecting critical cellular resources from interference, thus resolving the contradiction between resource utilization and interference prevention.
Solution Approach 2:
The patent applies local quality by regulating D2D transmission power specifically in resources used for cellular uplink signals. By controlling power locally in affected resources while allowing normal operation in other resources, the system enables D2D communication without causing harmful interference to cellular communication.
2Adaptability or versatility
If D2D communication uses downlink radio resources of cellular communication, then resource utilization is improved, but interference to cellular communication occurs
Solution Approach 1:
The patent segments downlink radio resources by identifying specific resources (PDCCH, PDSCH with downlink reference signals) that must be excluded from D2D communication. This segmentation allows D2D to utilize other downlink resources while protecting critical cellular downlink resources from interference.
Solution Approach 2:
The patent applies local quality by regulating D2D transmission power specifically in resources used for cellular downlink signals. By controlling power locally in affected resources while allowing normal operation in other resources, the system enables D2D communication without causing harmful interference to cellular communication.
3Reliability
If specific radio resources are regulated for D2D communication, then cellular communication stability is improved, but D2D resource availability decreases
Solution Approach 1:
The patent segments the total radio resources into protected resources (for cellular communication) and available resources (for D2D communication). By clearly defining which resources are protected and which are available, the system ensures cellular stability while maximizing D2D resource availability from the remaining resources.
Solution Approach 2:
The patent applies partial action by regulating D2D communication only in specific resources that cause interference to cellular communication, rather than restricting all resources. This partial regulation protects cellular stability while leaving other resources fully available for D2D use.
Data Source
AI summary
A mobile communication system supports cellular communication in which data communication is performed between a network and a user terminal and D2D communication in which data communication is directly performed among two or more user terminals. The D2D communication is performed by using a part of the uplink radio resources of the cellular communication. The uplink radio resources include a specific radio resource that is used in the transmission of a predetermined uplink signal in the cellular communication. The use of the specific radio resource in the D2D communication is regulated.