Multicast Radio Bearer Feedback for PTM Retransmission
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Solution Overview
Problem
Existing wireless communication technologies face challenges in supporting individual feedback information and retransmission for specific UEs in the point-to-multipoint (PTM) mode of multicast and broadcast services (MBS), as the existing polling procedure is common for all UEs and cannot be reused for individual feedback transmission and data retransmission.
Innovation Solution
Implementing a method that includes configuring a multicast data radio bearer (M-DRB) and a dedicated radio bearer (RB) associated with a radio link control (RLC) entity, where feedback information is transmitted via the dedicated RB, allowing for individual feedback and retransmission for specific UEs in the PTM mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common polling procedure is used for all UEs in PTM mode, then the system complexity is reduced and resource overhead is minimized, but individual feedback information and retransmission for specific UEs cannot be supported
Solution Approach 1:
The patent segments the feedback transmission mechanism by introducing a dedicated radio bearer specifically for feedback information, separating it from the common PTM data transmission. This allows individual UE feedback to be transmitted reliably while maintaining the efficiency of common data delivery through the M-DRB.
Solution Approach 2:
The patent applies local quality by configuring different bearers with different functions: the M-DRB is optimized for common multicast data transmission to multiple UEs, while the dedicated RB is optimized for individual feedback transmission. Each bearer has tailored characteristics suited to its specific purpose.
2Reliability
If a dedicated radio bearer is configured for each UE for feedback transmission, then individual feedback and retransmission are supported, but the device complexity and configuration overhead increase
Solution Approach 1:
The patent extracts the feedback transmission function from the common PTM data bearer and creates a separate dedicated radio bearer for this purpose. This extraction allows feedback and retransmission to be handled independently with appropriate reliability mechanisms while the M-DRB continues to handle efficient multicast data delivery.
Solution Approach 2:
The dedicated radio bearer serves multiple functions: it carries feedback information from individual UEs, supports retransmission of data packets, and enables reliable acknowledgment mechanisms. This multi-functionality justifies the additional configuration complexity by providing comprehensive reliability support.
Data Source
AI summary
Embodiments of the present application relate to a method and apparatus for multicast and broadcast services (MBS). An exemplary method includes: transmitting configuration information indicating a multicast data radio bearer (M-DRB) and a dedicated radio bearer (RB) both associated with a radio link control (RLC) entity; transmitting a set of RLC data packets to one or more user equipment (UEs) via the M-DRB in a point to multipoint (PTM) mode; and receiving feedback information for the set of RLC data packets via the dedicated RB of a UE of the one or more UEs. Embodiments of the present application can support feedback information and retransmission for a specific LIE in the PTM mode.