CSI Payload Repetition Encoding for Carrier Aggregation
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Solution Overview
Problem
In wireless communication systems, especially those implementing carrier aggregation, there is a challenge in efficiently reporting channel state information (CSI) due to desynchronization between user equipment (UE) and base stations regarding activated or deactivated carriers, leading to incorrect decoding of CSI values and inappropriate resource allocation, which affects data transmission rates and efficiency.
Innovation Solution
The method involves using repetition encoding and signaling bits to maintain a consistent payload size for CSI transmission, allowing the base station to correctly decode CSI even when the number of activated carriers changes, and incorporating a bitmap to indicate which carriers' CSI is included, ensuring accurate carrier activation or deactivation commands are received by the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of activated carriers varies dynamically, then the system can adapt to changing channel conditions and optimize data transmission rates, but the payload size for CSI transmission becomes variable leading to decoding errors and resource allocation issues
Solution Approach 1:
The patent changes the parameter of payload size from variable to fixed by using repetition encoding. When the number of activated carriers varies, instead of changing the payload size, the system repeats CSI values for activated carriers to fill the fixed payload structure, ensuring reliable decoding while adapting to different carrier activation states
Solution Approach 2:
The patent segments the CSI payload into individual carrier CSI values, where each carrier's CSI can be independently encoded and repeated. This segmentation allows the system to selectively repeat CSI for activated carriers while maintaining a consistent total payload size, resolving the contradiction between adaptability and reliability
2Reliability
If repetition encoding is used to maintain consistent payload size, then CSI decoding reliability is improved, but the amount of transmitted information increases due to duplicate CSI values
Solution Approach 1:
The patent applies partial repetition encoding where only the necessary number of CSI values are repeated to fill the fixed payload structure. Instead of repeating all CSI values unconditionally, the system repeats only enough to maintain consistent payload size while minimizing redundancy, thus improving reliability without excessive information transmission
3Productivity
If CSI payload size varies with the number of activated carriers, then the transmission efficiency is optimized by sending only necessary information, but the base station cannot correctly decode CSI values when expecting a different number of carriers
Solution Approach 1:
The patent uses preliminary action by pre-defining a fixed payload size structure for CSI transmission. The base station and UE both know the expected payload size in advance, allowing the base station to correctly allocate resources and decode CSI values without ambiguity, even when the number of activated carriers varies
Data Source
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AI summary
A method for communicating channel state information (CSI) to a base station is presented. The method includes identifying a number of allocated resources for CSI within at least one of a physical uplink control channel (PUCCH) payload and a physical uplink shared channel (PUSCH) payload. The method includes encoding channel state information (CSI) for activated carriers on a user equipment into the allocated resources for CSI. When a number of activated carriers on the user equipment is less than the number of allocated resources for CSI, the method includes using repetition encoding to duplicate the CSI for at least one of the activated carriers on the user equipment into the allocated resources for CSI.