Soft Buffer Partitioning for TDD Carrier Aggregation
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Solution Overview
Problem
In LTE-A systems, efficiently partitioning the soft buffer in TDD mode to handle multiple serving cells with different UL-DL configurations is challenging, leading to increased blocking probability and diminished system throughput.
Innovation Solution
A method and apparatus for partitioning the soft buffer by determining the total number of soft channel bits, maximum transport blocks, and maximum HARQ processes, and selecting a partition size based on these parameters, allowing for efficient allocation of resources across multiple serving cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the soft buffer is partitioned to handle multiple serving cells with different UL-DL configurations, then the system can support carrier aggregation in TDD mode, but the blocking probability increases and system throughput diminishes
Solution Approach 1:
The soft buffer is segmented into multiple partitions, each dedicated to a specific serving cell. This segmentation allows independent management of HARQ processes for each serving cell, preventing blocking in one cell from affecting others. The partition sizes are determined based on the total number of soft channel bits and the maximum number of transport blocks per TTI, enabling optimized resource allocation across multiple serving cells with different UL-DL configurations.
2Adaptability or versatility
If the soft buffer is partitioned to manage HARQ processes for multiple serving cells, then carrier aggregation can be supported, but the complexity of buffer management increases
Solution Approach 1:
The soft buffer is divided into separate partitions for each serving cell, which simplifies management by isolating HARQ processes to specific partitions. This segmentation approach reduces the complexity of tracking and managing HARQ processes across multiple serving cells, as each partition can be managed independently according to its associated serving cell's UL-DL configuration.
Solution Approach 2:
Each partition is configured with specific local parameters including partition size, maximum number of transport blocks, and HARQ process management rules tailored to its associated serving cell. This local quality approach allows optimized buffer management for each serving cell's specific characteristics while maintaining overall system simplicity through standardized partitioning methodology.
Data Source
AI summary
A method for partitioning a soft buffer in a time-division duplex system and an apparatus using the same are disclosed. The method includes the following steps. A total number of soft channel bits, a maximum number of transport blocks transmittable to a user equipment (UE) in a transmission time interval (TTI), a maximum number of downlink (DL) hybrid automatic retransmit request (HARQ) processes, and a configured maximum number of HARQ processes are determined. A partition size of the soft buffer is selected according at least to the total number of soft channel bits, the maximum number of transport blocks transmittable to the UE in the TTI, the maximum number of DL HARQ processes, and the preconfigured maximum number of HARQ processes.