D2D Communication Resource Allocation for Inter-Frequency Cell Selection
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Solution Overview
Problem
In LTE Advanced systems, device-to-device (D2D) communication can lead to base station overload when multiple terminal apparatuses concentrate on a single frequency, exceeding capacity, and existing methods for supporting D2D in inter-frequency cells have not been thoroughly discussed.
Innovation Solution
A terminal apparatus and base station apparatus that allow efficient D2D communication by using a radio resource pool indicated by system information for inter-frequency neighboring cells, with the terminal apparatus selecting a frequency based on measurement results and system information, and the base station notifying the terminal apparatus of suitable cell selection criteria and radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminal apparatuses concentrate on a single frequency for D2D communication, then D2D communication capability is improved, but base station capacity is exceeded causing overload
Solution Approach 1:
The patent segments the single frequency resource into multiple frequency resources by allowing D2D communication on inter-frequency neighboring cells. Terminal apparatuses can be distributed across multiple frequencies (serving cell frequency and neighboring cell frequencies), preventing concentration on a single frequency and avoiding base station overload while maintaining D2D communication capability.
2Adaptability or versatility
If terminal apparatuses perform cell re-selection to access D2D frequencies, then D2D communication is enabled, but communication delay increases
Solution Approach 1:
The patent performs preliminary action by pre-acquiring system information (including D2D resource pool configuration) from inter-frequency neighboring cells while the terminal apparatus is camped on the serving cell. This allows the terminal to immediately access D2D resources without performing cell re-selection or handover, thereby enabling D2D communication without communication delay.
3Productivity
If base station notifies system information for inter-frequency cells, then D2D communication efficiency is improved, but information transmission overhead increases
Solution Approach 1:
The patent uses universal system information blocks (SIBs) that serve multiple functions: they provide both traditional cell selection/re-selection information and D2D resource pool configuration information. By embedding D2D-related system information (such as SIB18) in the existing system information framework, the patent avoids creating separate dedicated information channels, thereby improving D2D communication efficiency while minimizing information transmission overhead.
Data Source
AI summary
Provided is a technique related to a terminal apparatus, a base station apparatus, a communication system, a communication method, and an integrated circuit which are capable of efficiently performing device-to-device communication. Based on a measurement result of an inter-frequency neighboring cell that supports the direct communication, a cell selection criterion that is used for cell selection, and system information related to the direct communication, which is acquired from a base station apparatus, a terminal apparatus capable of direct communication with a terminal apparatus performs the direct communication with the inter-frequency neighboring cell by using a radio resource pool that is indicated with the system information.