D2D Initial Entry Procedure in LTE Wireless Systems
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Solution Overview
Problem
There is no specified initial entry procedure for Device-to-Device (D2D) communication in general wireless communication systems, making it inconvenient for User Equipment (UE) to perform D2D communication.
Innovation Solution
A method and apparatus for performing initial entry in D2D communication, involving a terminal that transmits an initial entry request to a Mobility Management Entity (MME) and receives acceptance information, including D2D communication details, and an apparatus that determines service requests based on subscriber information and transmits acceptance information to a base station and terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a general initial entry procedure is used for D2D communication, then the procedure can be performed in existing wireless communication systems, but it is inconvenient and lacks D2D-specific optimization
Solution Approach 1:
The patent segments the initial entry procedure into D2D-specific and general components. A separate D2D initial entry procedure is defined that includes D2D-specific signaling elements (D2D service request, D2D communication information) while reusing existing LTE initial entry infrastructure (MME, base station, attach request/accept messages). This segmentation allows D2D communication to have its own optimized procedure while maintaining compatibility with legacy systems.
2Adaptability or versatility
If a new D2D-specific initial entry procedure is created, then D2D communication can be optimized, but the system complexity increases
Solution Approach 1:
The patent merges the D2D initial entry procedure with the existing LTE initial entry procedure. The D2D service request is embedded within the attach request message, and the D2D communication information is included in the attach accept message. This merging approach allows D2D functionality to be added without creating a completely separate procedure, thereby limiting the increase in system complexity while still providing D2D-specific optimization.
3Adaptability or versatility
If D2D communication information is included in existing signaling messages, then seamless integration with legacy LTE systems is achieved, but the message structure becomes more complex
Solution Approach 1:
The patent makes existing LTE signaling messages multi-functional by enabling them to carry both traditional LTE information and D2D communication information. The attach request message serves both as a general network attachment request and as a D2D service request. The attach accept message provides both general network acceptance and D2D communication information. This universality allows seamless integration with legacy LTE systems while providing D2D functionality through the same message structures.
Data Source
AI summary
A method and apparatus for performing initial entry for Device-to-Device (D2D) communication in a wireless communication system include transmitting an initial entry request including a service request for D2D communication to a Mobility Management Entity (MME) by a terminal, and if the service request for D2D communication is accepted, receiving information indicating that the initial entry request is accepted, including D2D communication information from the MME by the terminal.