MAC Layer Transport Format Selection for HSPA+ and LTE QoS
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Solution Overview
Problem
The existing 3GPP medium access control (MAC) layer procedures are not designed to handle the new physical layer architectures and features of high speed packet access evolution (HSPA+) and long term evolution (LTE) systems, particularly in managing multiple data streams with different quality of service (QoS) requirements and hybrid automatic repeat request (HARQ) processes.
Innovation Solution
A method and apparatus for simultaneous transport format combination (TFC) selection in the MAC layer that assigns transmission attributes to parallel data streams based on channel quality measurements and QoS requirements, supporting multiple data streams on a common transmission time interval (TTI) with normalized or differentiated QoS, and dynamic hybrid automatic repeat request (HARQ) process assignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing 3GPP MAC layer procedures are used, then system simplicity is maintained, but the system cannot handle multiple data streams with different QoS requirements in HSPA+ and LTE systems
Solution Approach 1:
The patent segments the MAC layer procedures into separate functional components: transport format selection for each data stream, QoS parameter management, and resource allocation. This allows independent handling of multiple data streams with different QoS requirements while maintaining modular complexity management.
Solution Approach 2:
The patent introduces dynamic QoS parameter assignment and transport format selection that adapts to changing channel conditions and traffic requirements. The MAC layer dynamically adjusts transmission parameters for each data stream based on real-time QoS requirements, enabling flexible handling of multiple streams with varying demands.
2Productivity
If multiple parallel TFC selection functions are implemented, then data transmission efficiency for multiple streams is improved, but processing complexity increases
Solution Approach 1:
The patent divides the TFC selection process into parallel independent functions, each handling a specific data stream. This segmentation allows simultaneous processing of multiple streams without sequential bottlenecks, improving overall transmission efficiency while keeping each individual selection function relatively simple.
Solution Approach 2:
The patent designs universal TFC selection functions that can handle multiple data streams with different QoS requirements using the same underlying methodology. This multi-functionality approach improves productivity by processing multiple streams through standardized procedures rather than requiring entirely separate complex processing paths for each stream.
3Adaptability or versatility
If dynamic HARQ process assignment is implemented, then adaptability to changing channel conditions is improved, but control complexity increases
Solution Approach 1:
The patent implements dynamic HARQ process assignment where the selection of HARQ processes is adapted to changing channel conditions and traffic patterns. The system dynamically adjusts which HARQ processes are assigned to which data streams based on real-time channel quality measurements and QoS requirements, improving adaptability while managing control complexity through systematic selection criteria.
Data Source
AI summary
A wireless transmit receive unit (WTRU) and method are provided that process communication data in a hierarchy of processing layers including a physical (PHY) layer, a medium access control (MAC) layer and higher layers. A MAC layer transport format selection device defines an assignment of higher layer transmission data to parallel data streams based on data characteristics received from higher layers and physical resource information received from the PHY layer. The transport format selection also device generates transport format parameters for each data stream. A multiplexer component multiplexes the transmission data onto the parallel data streams in transport blocks in accordance with the data stream assignment and the respective transport format parameters generated by the transport format selection device and outputs the selectively multiplexed transmission data to the PHY layer for transmission over respective physical resource partitions. Preferably, the transport format selection device also generates physical transmission attributes such as modulation and coding rate (MCR), number of subframes per transmission time interval (TTI), duration of TTI, transmission power and hybrid automatic repeat request (HARQ) parameters.