PDCP Status Report for MBS Transmission Switching
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Solution Overview
Problem
Current multicast broadcast services in 5G mobile communication systems face challenges in providing reliable and efficient data transmission between Point-To-Point (PTP) and Point-To-Multipoint (PTM) transmission schemes, leading to packet loss and reduced communication reliability during scheme switching.
Innovation Solution
A communication control method and user equipment that trigger status reports at a predetermined layer to manage the switching between PTP and PTM transmission schemes, allowing for effective packet retransmission and improved reliability by using a split MBS bearer configuration and PDCP status reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission scheme switching between PTP and PTM is implemented for MBS data, then adaptability and service flexibility are improved, but communication reliability deteriorates due to packet loss during switching
Solution Approach 1:
The patent triggers status report transmission at the PDCP layer before or during the transmission scheme switching process. This preliminary action ensures that the base station receives up-to-date reception status information about MBS data packets before the switching occurs, enabling it to prepare appropriate retransmission strategies and maintain communication reliability during the transition between PTP and PTM modes.
Solution Approach 2:
The patent implements a feedback mechanism where the user equipment sends status reports indicating reception status of MBS data to the base station. This feedback loop allows the base station to monitor packet reception quality and initiate retransmissions of lost packets, thereby maintaining reliability while enabling flexible switching between transmission schemes.
2Reliability
If status reports are triggered during transmission scheme switching, then communication reliability is improved through packet retransmission, but loss of time increases due to additional reporting overhead
Solution Approach 1:
The status report transmission is triggered at the PDCP layer in anticipation of or concurrent with the transmission scheme switching event. By initiating the status report process beforehand or simultaneously with switching, the patent minimizes the time delay between packet loss occurrence and retransmission initiation, reducing the overall time loss while maintaining reliability.
3Measurement precision
If PDCP layer status reports are used for switching management, then measurement precision of reception status is improved, but device complexity increases due to additional layer coordination
Solution Approach 1:
The patent extracts the status report triggering function specifically to the PDCP layer, separating this critical function from other protocol layers. By dedicating the PDCP layer to handle status reporting during transmission scheme switching, the patent achieves precise reception status monitoring while organizing the complexity into a specific layer rather than distributing it across the entire protocol stack, making the system more manageable.
Data Source
AI summary
A communication control method performed by a UE in a mobile communication system for providing a multicast broadcast service (MBS) includes step S105 of receiving MBS data transmitted from a gNB through a transmission scheme either of Point-To-Point (PTP) transmission or Point-To-Multipoint (PTM) transmission, step S107 of triggering transmission of a status report indicating a reception status of the MBS data in a predetermined layer of the UE in response to switching of the transmission scheme between the PTP transmission and the PTM transmission, and step S108 of transmitting the status report to the gNB.