D2D Authorization Acquisition in Dual-Connectivity LTE
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Solution Overview
Problem
Existing LTE systems face challenges in acquiring Device-to-Device (D2D) authorization information under dual connection scenarios, which restricts the efficient operation of D2D communication and ProSe services, especially in micro-cell eNB environments with high frequency point coverage limitations.
Innovation Solution
The method involves an SeNB acquiring D2D authorization information from an MeNB via an X2 interface process, including SeNB addition or modification processes, and the MeNB acquiring D2D authorization information from an MME, which is then provided to the SeNB through an X2 interface, allowing resource allocation for D2D communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a user moves between new cells or between new cell and current cell, then handover process is triggered, but signaling impact on core network increases greatly
Solution Approach 1:
The patent extracts D2D authorization information from the core network signaling path and stores it locally at the eNB. This extraction eliminates the need for repeated D2D authorization signaling between eNB and MME during handovers, thereby reducing core network signaling impact while maintaining reliable handover processes.
Solution Approach 2:
The patent performs preliminary acquisition and storage of D2D authorization information at the eNB before handover occurs. By having this information预先 available, the system avoids triggering additional signaling during the actual handover process, thus reducing core network signaling load while ensuring handover reliability.
2Reliability
If D2D authorization information is acquired through existing LTE procedures, then core network control is maintained, but signaling overhead increases under dual connection scenarios
Solution Approach 1:
The patent extracts D2D authorization information from the core network and stores it locally at the eNB. This allows the eNB to autonomously manage D2D resources without repeatedly querying the MME, thereby reducing signaling overhead while the core network retains initial authorization control.
Solution Approach 2:
The patent introduces a local cache mechanism at the eNB as an intermediary between the core network and D2D communication. This intermediary stores D2D authorization information locally, reducing the need for direct signaling between eNB and MME during dual connection operations, thus lowering signaling overhead while maintaining core network control.
3Productivity
If micro-cell eNBs are introduced to improve coverage, then network capacity increases, but frequent handovers cause great signaling impact
Solution Approach 1:
The patent extracts D2D authorization information from core network signaling and stores it locally at each micro-cell eNB. This enables micro-cell eNBs to independently handle D2D communications without frequent core network signaling, allowing network capacity expansion while mitigating the signaling impact of frequent handovers.
Solution Approach 2:
The patent performs preliminary acquisition and local storage of D2D authorization information at micro-cell eNBs. This preliminary action ensures that when users frequently move between micro-cells, the handover process can proceed without triggering additional D2D authorization signaling to the core network, thus enabling high network capacity while reducing signaling impact.
Data Source
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AI summary
A method and apparatus for acquiring device-to-device (D2D) authorization information. The method comprises: a secondary evolved Node B (SeNB) acquires device-to-device (D2D) authorization information of a terminal UE from a master eNB (MeNB) by means of an X2 interface flow; and the SeNB allocates D2D resources to the UE according to the D2D authorization information. The SeNB can acquire the D2D authorization information of the UE under the condition of dual connection.