Transport Block Interleaving Across Subframes for Broadcast Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and NR technologies, face challenges in maintaining reliable broadcast transmissions, especially in high mobility scenarios where deep fades can result in failed transport blocks and lack of time diversity, leading to performance issues and unreliability.
Innovation Solution
The method involves interleaving parts of transport blocks across multiple time intervals, scaling their size by a factor, and transmitting these interleaved parts, allowing for improved time diversity and reliability in broadcast transmissions by distributing the data across non-consecutive subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transport blocks are transmitted in consecutive subframes without interleaving, then transmission speed is maintained, but reliability deteriorates in high mobility scenarios due to deep fades
Solution Approach 1:
The transport block is divided into multiple parts and distributed across different subframes through interleaving. Each part is transmitted in a separate subframe, allowing the receiver to combine multiple received parts to reconstruct the original data, thereby improving reliability in high mobility scenarios
Solution Approach 2:
The patent introduces time diversity by distributing transport block parts across multiple subframes in the time dimension. This transforms the transmission from a single-time-point operation to a multi-time-point operation, enabling the system to overcome deep fades that affect only specific subframes
2Reliability
If transport blocks are interleaved across multiple time intervals, then time diversity is improved, but transmission complexity increases
Solution Approach 1:
The interleaving pattern is predetermined and configured in advance through RRC signaling. Both the transmitter and receiver are pre-configured with the same interleaving parameters (number of parts, subframe distribution pattern), which simplifies the processing by eliminating the need for complex real-time pattern generation and synchronization
3Quantity of substance
If transport block size is scaled up for interleaving, then more data can be distributed across subframes, but processing overhead increases
Solution Approach 1:
The transport block size scaling factor is made dynamic and configurable through RRC signaling. The network can adjust the scaling factor according to channel conditions, mobility scenarios, and service requirements, allowing the system to optimize between transmission efficiency and reliability without being locked into a fixed size
Data Source
AI summary
A base station may perform interleaving of parts of a plurality of transport blocks for a broadcast or multicast transmission across a plurality of time intervals. A size of a transport block of the plurality of transport blocks may be scaled by a scaling factor. The base station may transmit the interleaved parts in the plurality of time intervals.