UE Discovery Signal Resource Indication in D2D Communications
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Solution Overview
Problem
In emergency situations where a base station cannot provide cellular service, devices struggle to establish synchronization and share discovery signal resource configuration information for efficient device-to-device communication, leading to increased power consumption and resource limitations.
Innovation Solution
A method where a UE within a cellular service area receives information from a base station to transmit synchronization and discovery signal-related information to nearby UEs, allowing them to configure and perform device-to-device communication, even without a functioning base station, by using allocated communication resources efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs transmit discovery signals at different time points without synchronization, then each UE can independently transmit discovery signals, but power consumption increases significantly due to continuous monitoring requirements
Solution Approach 1:
The patent applies preliminary action by having UEs transmit synchronization signals before discovery signal transmission. This establishes a common time reference in advance, allowing UEs to synchronize their discovery signal transmission times and thereby reduce continuous monitoring requirements and power consumption during the discovery process
2Reliability
If a base station provides cellular service normally, then UEs can acquire synchronization easily, but in emergency situations where base station is unavailable, synchronization cannot be established
Solution Approach 1:
The patent applies self-service by enabling UEs to autonomously establish synchronization and exchange discovery signal resource configuration information without base station assistance. UEs in emergency situations can independently transmit synchronization signals and configure discovery signals based on received configuration information, making the system self-sufficient when cellular infrastructure is unavailable
Solution Approach 2:
The patent uses discovery signal resource configuration information as an intermediary that carries synchronization and resource allocation details. This intermediary mechanism allows UEs to indirectly establish synchronization and coordinate discovery signals without direct base station control, enabling emergency communication scenarios
3Adaptability or versatility
If additional D2D communication resources are used to transmit discovery signal configuration information, then discovery operation can be enabled in emergency areas, but resource consumption increases and existing cellular UE communication resources become more limited
Solution Approach 1:
The patent applies universality by designing the discovery signal resource configuration information to serve multiple functions simultaneously. The same configuration information transmits both synchronization details and discovery signal resource allocation, eliminating the need for separate dedicated resources and maximizing the utilization of available communication resources in emergency scenarios
Data Source
AI summary
Methods and apparatuses are provided for indicating a discovery signal resource by a User Equipment (UE) performing device-to-device communication. The UE receives information relating to the device-to-device communication from a base station. A synchronization signal including discovery signal-related information, is transmitted from the UE to a nearby UE, based on the information relating to the device-to-device communication. A discovery is performed based on the discovery signal-related information.