MAC-ehs SDU Segmentation Timing and Priority Multiplexing
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Solution Overview
Problem
The existing HSPA evolution MAC-ehs architecture is inefficient due to segmentation of MAC-ehs SDUs prior to knowing exact channel conditions, leading to suboptimal data transmission and requiring updates in both Node-B and WTRU, with inefficient use of resources and increased complexity.
Innovation Solution
The proposed solution involves segmenting MAC-ehs SDUs on a priority queue basis only when the transport block size for the transmission time interval is known, allowing for dynamic segmentation and multiplexing based on current channel conditions, with reordering PDUs generated and stored in priority queues for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If MAC-ehs SDUs are segmented prior to knowing exact channel conditions, then segmentation can be performed in advance, but data transmission efficiency deteriorates and latency increases
Solution Approach 1:
The patent applies preliminary action by performing segmentation just before transmission when the transport block size is known, rather than much earlier. This timing optimization ensures that segmentation occurs with complete information about channel conditions and transport requirements, maximizing transmission efficiency while still maintaining advance segmentation benefits
Solution Approach 2:
The patent introduces dynamic segmentation timing that adapts to channel conditions and transport block size availability. The segmentation point is dynamically adjusted to occur at the optimal moment when transport block size is known but still allows sufficient processing time, resolving the contradiction between advance segmentation and transmission efficiency
2Ease of operation
If segmentation is performed per logical channel, then organization is improved, but system complexity increases due to multiple reassembly entities required
Solution Approach 1:
The patent merges the segmentation function to operate on multiplexed MAC-ehs SDUs across multiple logical channels simultaneously, rather than maintaining separate segmentation functions for each logical channel. This consolidation reduces the number of reassembly entities needed while preserving logical channel organization through the multiplexing structure
Solution Approach 2:
The patent creates a universal segmentation entity that handles segmentation for multiple logical channels through the multiplexing framework. This single entity performs the segmentation function universally across different logical channels, eliminating the need for dedicated reassembly entities per logical channel while maintaining proper organization
3Productivity
If transport block size is determined early, then segmentation can be optimized, but adaptability to real-time channel conditions is reduced
Solution Approach 1:
The patent implements feedback by continuously monitoring channel conditions and using this information to determine the transport block size at the optimal timing point. The system receives feedback about channel state, adjusts the transport block size accordingly, and performs segmentation based on this optimized size, thereby maintaining both optimization and adaptability
Data Source
AI summary
A Node-B may prioritize a service data unit (SDU) associated with a logical channel of a priority queue that is associated with a segmentation component. A Node-B may also prioritize other SDUs associated with another priority queue associated with another segmentation component. The segmentation component may facilitate generating an enhanced high speed medium access control (MAC-ehs) reordering protocol data unit (PDU) that includes a segment of the SDU to transmit a MAC-ehs PDU on a high speed downlink shared channel (HS-DSCH).