LDPC Base Graph Selection for Cooperative PDSCH Reliability
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Solution Overview
Problem
Current wireless communication systems, particularly 5G, face challenges in reliably transmitting and receiving data across multiple transmission nodes for network cooperative communication, which is essential for improving communication reliability and supporting high data rates and low latency in IoT applications.
Innovation Solution
A method and apparatus that involve a user equipment (UE) in a wireless communication system, where the UE receives multiple PDSCH transmissions associated with different transmission configuration indicators, determines the transport block size, and applies a low-density parity-check (LDPC) base graph for encoding and decoding, ensuring consistent TB size and LDPC base graph across multiple transmission nodes for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDSCH transmissions are received from different transmission nodes with different TCI states, then network cooperative communication reliability is improved, but determining consistent transport block size and LDPC base graph across transmissions becomes complex
Solution Approach 1:
The patent applies homogeneity by ensuring that the transport block size determination parameters (MCS, resource allocation, antenna ports) and LDPC base graph selection criteria are kept consistent across multiple PDSCH transmissions from different transmission nodes. This allows the UE to uniformly process repeated transmissions without needing to handle different decoding parameters for each node, thereby maintaining reliability while reducing complexity.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the UE with TCI states and their associated parameters before the actual PDSCH transmissions occur. The UE is provided with information about which TCI states correspond to which transmission nodes and what parameters (MCS, resource allocation, antenna ports) to use for each. This pre-configuration enables the UE to seamlessly process multiple transmissions without real-time complexity.
2Adaptability or versatility
If transport block size is determined separately for each PDSCH transmission, then adaptability to different transmission conditions is improved, but consistency across repeated transmissions deteriorates
Solution Approach 1:
The patent applies universality by using a single, unified transport block size for all repeated PDSCH transmissions of the same transport block. Instead of determining different TB sizes for each transmission node or occasion, the system uses one TB size that applies universally across all transmissions. This ensures consistency while still allowing the TB size to be adapted to overall channel conditions through the TCI state configuration.
Data Source
AI summary
A method by a user equipment (UE) in a wireless communication system includes: receiving a first physical downlink shared channel (PDSCH) transmission and a second PDSCH transmission that carry a same transport block (TB) and are associated with a first transmission configuration indicator (TCI) state and a second TCI state, respectively; determining a transport block size (TBS) of the first PDSCH transmission; and determining low-density parity-check (LDPC) base graph corresponding to the transport block based on the determined TBS for each of the first PDSCH transmission and the second PDSCH transmission, wherein the determined TBS of the first PDSCH transmission is applied to the second PDSCH transmission.