D2D Communication Control via Buffer Status and RNTI Allocation
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Solution Overview
Problem
Current 3GPP standards lack specifications for effectively controlling Device-to-Device (D2D) communication, making it difficult to achieve compatibility with cellular communication.
Innovation Solution
A communication method where a user terminal transmits buffer status information to a base station, which assigns a radio network temporary identifier and determines radio resources for D2D communication, allowing separate control of D2D communication from cellular communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented without separate control specifications, then device-to-device direct communication is enabled, but compatibility with cellular communication deteriorates and network control is lost
Solution Approach 1:
The patent segments the communication control by introducing separate control specifications for D2D communication distinct from cellular communication. The base station controls D2D communication through separate buffer status information reporting and separate radio resource allocation, dividing the overall communication control into cellular and D2D segments while maintaining network oversight.
Solution Approach 2:
The base station acts as an intermediary that mediates between D2D communication and cellular communication. It receives buffer status information from user terminals, determines appropriate radio resources, and allocates them through downlink control information, ensuring that D2D communication operates under network control while maintaining compatibility with cellular systems.
2Reliability
If separate control specifications are introduced for D2D communication, then network control and compatibility are improved, but system complexity increases
Solution Approach 1:
The patent applies universality by using existing cellular communication infrastructure and protocols for D2D communication control. The base station uses its existing scheduling and resource allocation mechanisms, while user terminals utilize existing uplink control channels to report buffer status, making the control system multi-functional without requiring entirely new separate systems.
Solution Approach 2:
The base station performs preliminary actions by pre-configuring radio resources and allocating them through downlink control information before D2D communication occurs. Buffer status reporting is established in advance, allowing the base station to proactively manage radio resource allocation and avoid complex real-time decisions during actual D2D communication.
3Manufacturing precision
If buffer status information is reported for each logical channel group and communication partner, then radio resource allocation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent organizes buffer status information reporting along multiple dimensions: by logical channel group and by communication partner. This multi-dimensional reporting structure allows the base station to accurately track buffer status for different purposes while systematically managing the signaling overhead through structured information organization rather than random or redundant reporting.
Data Source
AI summary
A communication method, user terminal, processor, and base station for direct communication including a user terminal transmitting to a base station, buffer status information indicating amounts of data to be transmitted in direct communication, where each amount of data is for each of logical channel groups for the direct communication and for each communication partner of the direct communication, assigning, by the base station to the user terminal, a radio network temporary identifier for the direct communication, determining, by the base station, a radio resource to be used for the user terminal to perform the direct communication, transmitting, from the base station to the user terminal, resource information indicating the determined radio resource, by use of the radio network temporary identifier assigned to the user terminal, and receiving, by the user terminal, the resource information on a basis of the radio network temporary identifier assigned to the user terminal.