PDCP Sequence Number Target Set for Wireless MBS Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in ensuring reliable data transmission during transitions between Point to Point (PTP) and Point to Multipoint (PTM) transmission modes, especially for Multicast Broadcast Services (MBS), where determining which data units need retransmission and when to generate reports is complex, leading to potential delays and resource wastage.
Innovation Solution
A method is introduced where a Packet Data Convergence Protocol (PDCP) sequence number is used to determine a target sequence number set, allowing for the transmission of reports that indicate missing data units, thereby optimizing resource utilization and ensuring data continuity during mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission mechanisms are used to ensure reliable data transmission in MBS services, then transmission reliability is improved, but system complexity and resource consumption increase
Solution Approach 1:
The patent segments the retransmission process by introducing separate indication information for different transmission modes (PTP and PTM). The receiving device generates separate acknowledgment indications for each mode, allowing the transmitting device to handle retransmissions independently for each mode. This segmentation reduces the complexity of managing mixed-mode retransmissions while maintaining reliability.
Solution Approach 2:
The patent applies local quality by treating PTP and PTM transmissions with different retransmission strategies. PTP transmissions use conventional acknowledgment-based retransmission, while PTM transmissions use indication-based retransmission. This localized approach optimizes each transmission mode's reliability mechanism according to its specific requirements, reducing overall system complexity.
2Reliability
If comprehensive reports are transmitted to indicate all missing data units, then data completeness is improved, but uplink resource consumption and latency increase
Solution Approach 1:
The patent extracts only the essential information needed for retransmission by introducing indication information that specifically identifies missing data units in each transmission mode. Instead of transmitting comprehensive reports about all received and missing data, the system extracts and transmits only the critical acknowledgment indications for PTP and PTM modes separately, reducing reporting overhead and latency.
Solution Approach 2:
The patent applies partial action by transmitting indication information only when necessary - specifically when data loss is detected in PTP or PTM modes. The receiving device generates indication information selectively based on actual transmission outcomes, avoiding unnecessary comprehensive reporting and reducing uplink resource consumption while maintaining data completeness.
3Reliability
If separate retransmission methods are used for PTP and PTM modes, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent achieves universality by designing a unified indication information structure that can handle both PTP and PTM retransmissions. The indication information includes mode identification and data unit identification components that work for both transmission modes, allowing a single mechanism to serve multiple functions and reducing the need for separate complex retransmission handling procedures.
Solution Approach 2:
The patent segments the indication information into distinct components for PTP and PTM modes, with each component containing mode-specific parameters. This segmentation allows the receiving device to generate concise, mode-specific indications that the transmitting device can process independently, reducing overall device complexity while maintaining separate optimized retransmission methods for each mode.
Data Source
AI summary
The present application discloses a method and device for wireless communications, comprising receiving a first Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU), and the first PDCP PDU comprising a first PDCP sequence number; in response to there existing PDCP SDU(s) indexed by X1 PDCP sequence number(s) in a target PDCP sequence number set not being correctly received, transmitting a first report; wherein the first PDCP sequence number is used to determine the target PDCP sequence number set; the first report indicates that a PDCP SDU indexed by a first PDCP sequence number set is not received, the first PDCP sequence number set comprises the X1 PDCP sequence number(s), the target PDCP sequence number set comprises X PDCP sequence numbers, X1 being a positive integer not greater than X. The present application improves resource utilization and reduces resource waste by transmitting a first report.