Radio Resource Allocation for D2D Discovery Control
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Solution Overview
Problem
Current frameworks lack an effective framework to enable the simultaneous functioning of user terminal-based (UE-type) and network-based (NW-type) discovery processes in Device-to-Device (D2D) communication, which are essential for efficient radio resource allocation and control in mobile communication systems.
Innovation Solution
A communication control method where a base station broadcasts information indicating a radio resource region, allocates a radio resource to user terminals, and dedicates control information to them, allowing both UE-type and NW-type discovery processes to be performed using allocated time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a base station manages all discovery processes centrally, then control precision is improved, but device complexity and network traffic load increase
Solution Approach 1:
The patent segments the discovery process into two distinct types: UE-type discovery where user terminals autonomously perform discovery operations using autonomously selected resources, and NW-type discovery where the base station centrally manages resource allocation. This segmentation allows the system to balance between autonomous terminal operation and centralized control based on specific discovery scenarios.
Solution Approach 2:
The patent introduces dynamic resource allocation where the base station can allocate different radio resources for UE-type and NW-type discovery processes based on network conditions and requirements. The system dynamically switches between autonomous terminal-based discovery and network-controlled discovery, optimizing control precision while managing network complexity adaptively.
2Ease of operation
If user terminals perform autonomous discovery operations, then ease of operation is improved, but reliability of resource allocation decreases
Solution Approach 1:
The patent implements preliminary resource allocation where the base station pre-allocates specific radio resources for UE-type discovery operations. User terminals select their discovery resources from these pre-defined allocations, combining autonomous operation with guaranteed resource availability. This preliminary action ensures that even when terminals operate autonomously, the resources they use are reliably managed by the network.
3Measurement precision
If dedicated control information is transmitted to each user terminal, then measurement precision is improved, but loss of energy increases
Solution Approach 1:
The patent creates a universal radio resource allocation framework where a single base station allocation mechanism serves multiple discovery types (both UE-type and NW-type discovery). The same resource allocation infrastructure supports both autonomous terminal operations and network-controlled operations, eliminating the need for separate dedicated control channels for each discovery type and reducing overall energy consumption.
Data Source
AI summary
A communication control method according to an embodiment, comprises: transmitting, by a base station, information indicating a radio resource region by broadcast, wherein the radio resource region indicates a region of radio resources which a user terminal is able to use in order to receive a direct radio signal from a proximal user terminal; allocating, by the base station, a radio resource among the radio resource region to the user terminal; and dedicatedly transmitting, by the base station, control information to the user terminal. The control information includes information indicating the allocated radio resource. The allocated radio resource is a radio resource which the user terminal is able to use in order to transmit a direct radio signal to the proximal user terminal.