Sidelink Channel State Reporting for D2D QoS Control
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Solution Overview
Problem
Conventional D2D communication systems lack support for feedback mechanisms to measure and report communication quality, hindering effective management of Quality of Service (QoS) in inter-terminal direct communication.
Innovation Solution
A user equipment is equipped with a receiving unit to receive synchronization or reference signals, a control unit to measure the channel state of sidelink, and a transmitting unit to report this information to the base station or other user equipment, enabling accurate communication quality control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional D2D communication is used without feedback mechanisms, then device complexity is reduced and ease of operation is improved, but communication quality control capability deteriorates and QoS management becomes impossible
Solution Approach 1:
The patent implements feedback mechanisms where user equipment measures channel state information (CSI) based on received synchronization signals or reference signals and reports this information back to the base station or transmitting user equipment. This enables the system to obtain communication quality metrics and adjust transmission parameters accordingly, resolving the contradiction by introducing controlled feedback to improve reliability while managing complexity through standardized measurement and reporting procedures.
2Productivity
If channel state measurement and reporting is implemented in D2D communication, then communication quality control is improved and transmission efficiency is enhanced, but device complexity increases and loss of energy occurs due to additional signaling
Solution Approach 1:
The patent implements channel state measurement and reporting selectively rather than continuously. Measurements are performed based on configured thresholds or specific triggering conditions, and reporting is conducted only when channel state changes exceed predetermined levels. This partial action approach improves transmission efficiency by enabling adaptive modulation and coding while reducing energy consumption compared to continuous measurement and reporting.
3Reliability
If continuous channel state measurement and feedback reporting is performed, then communication quality control is improved, but loss of time occurs due to measurement and signaling overhead
Solution Approach 1:
The patent implements periodic channel state measurement and reporting where user equipment measures CSI at configured intervals and reports to the base station or transmitting user equipment at regular periods. This periodic action ensures timely QoS management and adaptive transmission parameter adjustment while minimizing time overhead by using efficient measurement methodologies and compact reporting formats, resolving the contradiction between reliability improvement and time loss.
Data Source
AI summary
A user equipment communicates with a first user equipment or a base station apparatus, the user equipment including a receiving unit configured to receive a synchronization signal or a reference signal used in sidelink transmitted from the first user equipment; a control unit configured to measure a channel state of sidelink, based on the synchronization signal or the reference signal; and a transmitting unit configured to transmit, to the base station apparatus or the first user equipment, information indicating the channel state of sidelink.