PDCCH Blind Decoding Buffer Layout for Lower Memory Duplication
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Solution Overview
Problem
Current wireless communication devices face inefficiencies in managing data required for decoding the physical downlink control channel (PDCCH) in 5G systems, leading to repeated storage and suboptimal memory usage.
Innovation Solution
A method and device configuration that involves storing log likelihood ratios (LLRs) in a data buffer and their addresses in separate address buffers, allowing for efficient blind decoding by preventing repeated storage and optimizing memory use through a data management circuit and RF integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data required for decoding PDCCH is stored in a buffer for blind decoding operations, then decoding performance is improved, but memory usage increases due to repeated storage of the same data
Solution Approach 1:
The patent divides the buffer into two separate components: a data buffer for storing LLR values and an address buffer for storing pointers to that data. This segmentation allows the same data to be referenced multiple times through different addresses without duplicating the actual data storage, thereby reducing memory consumption while maintaining decoding performance.
Solution Approach 2:
Instead of copying the actual data (LLR values) multiple times for different PDCCH candidates, the patent stores only the address/pointer to the data in the address buffer. This copying of references rather than data itself significantly reduces memory usage while allowing the decoder to access the required data efficiently.
2Reliability
If multiple PDCCH candidates are stored in a buffer for blind decoding, then communication reliability is improved, but data management complexity increases
Solution Approach 1:
The address buffer acts as an intermediary between the data buffer and the blind decoding operation. It manages the complexity of tracking multiple PDCCH candidates by storing simple address pointers rather than managing complex data structures, thereby reducing data management complexity while supporting multiple candidates for reliable communication.
Solution Approach 2:
The patent performs preliminary organization of data and addresses before the blind decoding process. By pre-storing addresses in the address buffer corresponding to different PDCCH candidates, the system simplifies the subsequent decoding operation and reduces the complexity of real-time data management during communication.
Data Source
AI summary
Systems and methods are described for a method of operating a wireless communication device includes receiving a physical downlink control channel (PDCCH) including a plurality of control channel elements (CCE), storing a plurality of LLRs generated by demodulating the PDCCH in a data buffer, storing at least one address of the LLRs, corresponding to a plurality of PDCCH candidates in accordance with an aggregation level for the CCEs, in a plurality of address buffers, and performing blind decoding on the PDCCH candidates by using the data buffer and the address buffers.