Dynamic Radio Resource Management for D2D Discovery Signals
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Solution Overview
Problem
Current mobile communication systems lack a mechanism for appropriately controlling Device to Device (D2D) communications, particularly in managing radio resources for discovery signals in multi-frequency band environments, leading to interference and inefficient communication.
Innovation Solution
A mobile communication system that includes a base station and user terminals capable of transmitting and receiving system information blocks indicating reserved radio resources, allowing for the designation of specific frequency and time resources for D2D discovery signals, and dynamically changing these resources as needed to prevent interference and ensure effective communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio resources for D2D discovery signals are not dynamically managed, then system complexity is reduced, but communication efficiency deteriorates due to interference and resource conflicts
Solution Approach 1:
The patent implements dynamic radio resource management for D2D discovery signals by allowing the base station to change resource allocations (frequency bands, resource blocks, time cycles) based on current system conditions. The base station transmits system information blocks containing resource configuration and can notify user terminals of resource changes, enabling adaptive resource management that optimizes communication efficiency while maintaining controlled complexity through centralized management.
2Object-affected harmful factors
If specific radio resources are designated for D2D discovery signals, then interference between cellular and D2D communications is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent segments radio resources into dedicated D2D discovery signal resources and cellular communication resources. The base station allocates specific frequency bands, resource blocks, and time cycles for D2D discovery signals, separating them from cellular uplink/downlink resources. This segmentation reduces interference between cellular and D2D communications while managing complexity through structured resource division and centralized base station control.
3Quantity of substance
If D2D discovery signals use shared frequency bands with cellular communications, then spectrum utilization is improved, but interference between communications increases
Solution Approach 1:
The patent applies local quality by assigning different resource characteristics to different communication types within the same frequency band. D2D discovery signals are allocated specific resource blocks, frequency bands, and time cycles that are optimized for discovery purposes, while cellular communications use other resources. This localized resource differentiation enables efficient spectrum utilization while minimizing interference through targeted resource allocation.
Data Source
AI summary
A radio base station, user terminal, and apparatus in a mobile communication system including a plurality of cells corresponding to a plurality of frequency bands are configured to either transmit or receive a system information block indicating radio resources. The radio resources are used by a user terminal to transmit and/or receive a direct discovery signal for discovering another user terminal in proximity of the user terminal. The system information block includes information indicating a cycle of time resources reserved as the radio resources, information indicating one or more frequency bands selected from the plurality of frequency bands, and information indicating one or more resource blocks reserved as the radio resources in the one or more frequency bands. The radio base station, user terminal, and apparatus further configured to either transmit or receive change notification information, relating to a change of the radio resources, separately from the system information block.