Relay UE Sidelink BSR Triggering Logic for D2D
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Solution Overview
Problem
Current D2D communication systems lack an effective method for triggering Buffer Status Reports (BSR) for sidelink data, which is essential for efficient data transmission between User Equipments (UEs) in wireless communication systems.
Innovation Solution
A method where a Relay UE does not trigger a BSR when receiving sidelink data from an eNB, instead waiting for a sidelink grant before transmitting sidelink data, thereby optimizing data transmission in D2D communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Relay UE triggers a BSR when receiving sidelink data from an eNB, then the buffer status is reported promptly, but unnecessary BSR triggers occur when the UE has no data to transmit
Solution Approach 1:
The patent applies preliminary action by checking whether the sidelink data was received from an eNB before triggering a BSR. This pre-check prevents unnecessary BSR triggers in advance, solving the contradiction between timely buffer status reporting and energy conservation from spurious triggers.
2Speed
If a Relay UE transmits sidelink data immediately upon receiving it, then data transmission speed is improved, but transmission errors increase without proper authorization
Solution Approach 1:
The patent implements feedback by checking whether a sidelink grant has been received from the eNB before transmitting sidelink data. This feedback mechanism ensures that transmission only occurs when authorized, resolving the contradiction between fast data transmission and reliable error-free communication.
3Reliability
If a Relay UE waits for sidelink grant before transmitting data, then transmission reliability is improved, but transmission delay increases
Solution Approach 1:
The patent applies partial action by waiting for sidelink grant only when the sidelink data was received from an eNB, but not when it was generated locally. This selective waiting approach maintains reliability for network-originated data while avoiding unnecessary delays for locally-generated data.
Data Source
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AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for triggering a BSR for sidelink data in a D2D communication system, the method comprising: configuring a sidelink logical channel; receiving a sidelink data of the sidelink logical channel from upper layer; checking whether the sidelink data of the sidelink logical channel is received from the eNB or not; and triggering a buffer status reporting according to a result of the checking, wherein if the sidelink data of the sidelink logical channel is received from the eNB, the buffer status reporting is not triggered.