WTRU Lossless PTP to PTM Mode Switching via Sequence Number Offset
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Solution Overview
Problem
Current wireless communication systems face challenges in seamlessly switching between point-to-point (PTP) and point-to-multipoint (PTM) transmission modes in multicast and broadcast services (MBS), particularly in adapting to reliability conditions and network configurations, which can lead to inefficiencies and service disruptions.
Innovation Solution
A wireless transmit-receive unit (WTRU) is configured to dynamically switch between PTP and PTM modes based on reliability conditions, using sequence numbers and offsets to manage data packet reception windows and RLC entity operations, and receives configuration information from the network to trigger mode switches and adjust RLC state variables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the WTRU switches between PTP and PTM transmission modes dynamically, then service reliability and adaptability to network conditions are improved, but system complexity and difficulty of managing data packet reception increase
Solution Approach 1:
The patent implements dynamic switching between PTP and PTM transmission modes based on real-time reliability conditions. The WTRU monitors packet reception status and automatically transitions between transmission modes to adapt to changing network conditions, making the system flexible and reliable rather than static
Solution Approach 2:
The patent segments the data packet reception process into distinct manageable components: reception windows with sequence number tracking, buffer management for out-of-order packets, and mode-specific handling procedures. This segmentation allows complex switching operations to be broken down into controllable steps
2Reliability
If the WTRU extends the data packet reception window to accommodate out-of-order packets, then packet reception completeness is improved, but processing time and buffer management complexity increase
Solution Approach 1:
The patent extends the reception window boundary in advance before out-of-order packets arrive. By pre-configuring the window to accommodate packets that may arrive late or out of sequence, the system avoids delays when these packets actually arrive, as the buffer space is already prepared
Solution Approach 2:
The patent maintains copies of reception status information including sequence numbers and acknowledgment states in buffers. This copying mechanism allows the system to track multiple packet states simultaneously and manage retransmissions without losing track of original transmission status
3Measurement precision
If the WTRU uses sequence numbers and offsets to manage packet reception, then packet tracking precision is improved, but computational overhead and processing complexity increase
Solution Approach 1:
The patent uses sequence numbers as key parameters to identify and track individual data packets. By changing from generic packet identification to precise sequence number tracking with offset calculations, the system achieves accurate packet positioning and status monitoring throughout the reception and retransmission process
Data Source
AI summary
A wireless transmit-receive unit (WTRU) may receive an indication to switch from a point-to-point (FTP) transmission mode to a point-to-multipoint (PTM) transmission mode or determine to switch from the PTP transmission mode to the PTM transmission mode based on a reliability condition associated with the PTM mode. Based on the indication or the determination, the WTRU may switch from the PTP transmission mode to the PTM transmission mode. The WTRU may receive a first data packet. The WTRU may extend a data packet reception window by extending a boundary of the data packet reception window. The boundary may be extended based on a sequence number (SN) of the first data packet and an offset.