Multi-Transport Block Grants With Time-Diversity Gaps
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Solution Overview
Problem
Existing LTE systems face inefficiencies in multi-transport block grant transmissions, particularly for Category M User Equipment (UE), due to limitations such as reduced data capacity, increased complexity, and the inability to support time diversity and blind decoding of different sized DCI messages, which are necessary for efficient scheduling and resource utilization.
Innovation Solution
The method involves interleaving transport blocks with gaps of predetermined periods to facilitate time diversity and reduce the size of downlink control information (DCI) by using techniques like a multi-grant flag, same modulation and coding scheme for all TBs, and limiting resource choices, thereby optimizing resource usage and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transport blocks are scheduled individually with separate grants, then each transport block can be transmitted with full resources, but the number of unused sub-frames increases and data rate decreases
Solution Approach 1:
The patent combines multiple transport block schedules into a single multi-TB grant that can schedule up to 8 transport blocks simultaneously. This merging of scheduling operations eliminates the need for separate grants for each TB, reducing control channel overhead and eliminating unused sub-frames between individual TB transmissions, thereby improving data rate and resource utilization.
2Reliability
If multiple transport blocks are transmitted in sequence without gaps, then resource usage is maximized, but time diversity cannot be achieved
Solution Approach 1:
The patent implements periodic gaps between transport block transmissions within the multi-TB grant structure. These regularly spaced gaps enable time diversity by separating transmissions in time, allowing the system to exploit varying channel conditions across different time instances while still maintaining high resource utilization through the consolidated grant approach.
3Adaptability or versatility
If the UE performs blind decoding of MPDCCH for different sized DCI messages, then flexible scheduling is enabled, but the UE complexity increases
Solution Approach 1:
The patent employs a unified DCI message format for multi-TB grants that maintains consistent structure and size regardless of the number of transport blocks scheduled. This homogenization of the control message format eliminates the need for blind decoding of multiple DCI sizes, reducing UE complexity while preserving scheduling flexibility through the use of indicator fields within the standardized message structure.
Data Source
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AI summary
There is provided a method and system for transmitting control information for user equipment. According to embodiments there is provided a method and apparatus for enabling multi-transport block scheduling with time diversity. According to embodiments, there is provided a method and apparatus for managing multi-transport block transmission.