RedCap L2 Buffer Sizing From Data-Channel Bandwidth
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Solution Overview
Problem
For reduced capability (RedCap) terminal devices, the transmission or processing of transport blocks is inefficient due to the constraint of data channels being limited to less than the bandwidth of the configured BWP, leading to resource waste or overflow issues in the data link layer L2 buffer.
Innovation Solution
Determine the size of the data link layer L2 buffer based on the maximum frequency resource occupiable by the data channel, rather than the BWP, to adapt the buffer size to the terminal device's resources, preventing resource waste and overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large bandwidth BWP is configured for RedCap terminal device, then the terminal device can access more frequency resources, but the data channel bandwidth is constrained to less than the BWP bandwidth (e.g., no greater than 5 MHz), leading to resource waste in the L2 buffer
Solution Approach 1:
The patent changes the parameter used for buffer size determination from BWP bandwidth to data channel bandwidth. Specifically, the terminal device determines the size of the L2 buffer based on the bandwidth of the data channel (e.g., up to 5 MHz) rather than the configured BWP bandwidth (e.g., 20 MHz), ensuring the buffer size matches the actual data processing capacity and eliminates resource waste.
2Productivity
If transport block is transmitted with all PRBs of the BWP, then the transmission utilizes the full configured bandwidth, but this causes anomaly in transmission or processing since the data channel bandwidth is constrained
Solution Approach 1:
The patent changes the basis for transport block transmission from BWP bandwidth to data channel bandwidth. The network device and terminal device both determine the maximum frequency resource occupiable by the data channel (e.g., 5 MHz) and use this to determine transport block size and buffer parameters, ensuring transmission matches actual processing capability and eliminating anomalies.
Data Source
AI summary
A method for determining a size of a buffer of a data link layer L2, the method includes: determining a maximum frequency resource occupiable by a data channel corresponding to the terminal device; and determining the size of the buffer of the data link layer L2 in the terminal device based on the maximum frequency resource.