Rate-Splitting Signaling for Private and Common Codeword Scheduling
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Solution Overview
Problem
Existing control signaling frameworks in wireless communication systems do not effectively accommodate rate-splitting techniques, which divide messages into private and common portions for efficient transmission, leading to suboptimal channel utilization and capacity.
Innovation Solution
A signaling framework that utilizes separate scheduling parameters for private and common codewords, allowing dynamic allocation based on channel conditions, and employs modified control signaling formats to facilitate interference cancellation and improved decoding at the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rate-splitting techniques are used to divide messages into private and common portions, then channel capacity and degrees of freedom are improved, but existing control signaling frameworks cannot accommodate such communication schemes
Solution Approach 1:
The message is segmented into two distinct portions: a common portion that can be decoded by multiple UEs and a private portion that is specific to each UE. This segmentation allows the system to maintain compatibility with existing control signaling frameworks while enabling rate-splitting techniques, as each portion can be handled separately through appropriate signaling mechanisms.
Solution Approach 2:
The patent introduces a new dimension to the control signaling framework by adding rate-splitting specific parameters and fields to existing signaling messages. This allows the framework to accommodate rate-splitting without completely redesigning the signaling structure, maintaining backward compatibility while enabling new functionality.
2Adaptability or versatility
If separate scheduling parameters are used for private and common codewords, then dynamic allocation based on channel conditions is achieved, but control signaling overhead increases
Solution Approach 1:
The patent merges the signaling for private and common codewords into a unified control signaling message structure. By combining scheduling parameters for both codeword types in a single message with shared and separate parameter fields, the system achieves dynamic allocation while minimizing overhead through parameter sharing where applicable.
Solution Approach 2:
The control signaling message structure is designed to be universal, handling both private and common codewords through a unified framework. The signaling message can adaptively allocate resources for different codeword types based on channel conditions, with parameters that serve multiple functions depending on the transmission scenario.
3Productivity
If common portions are combined with other common portions for group transmission, then spectral efficiency is improved, but interference management becomes more complex
Solution Approach 1:
The patent applies preliminary action by having UEs decode the common portion first before attempting to decode their private portions. This sequential decoding approach simplifies interference management, as the common portion can be subtracted from the received signal before private codeword decoding, reducing the complexity of managing interference between multiple common transmissions.
Data Source
AI summary
Methods, systems, and devices for wireless communications at a first user equipment (UE) are described. A first UE may receive one or more control signaling messages including first scheduling parameters for a common codeword associated with downlink data for the first UE and with downlink data for a second UE and one or more second scheduling parameters for a private codeword associated with additional downlink data for the first UE. The first UE may receive a physical downlink shared channel message including the common codeword mapped to one or more first layers of the physical downlink shared channel message and the private codeword mapped to one or more second layers of the physical downlink shared channel message. Additionally or alternatively, the first UE may receive a first physical downlink shared channel message including the common codeword and a second physical downlink shared channel message including the private codeword.