CSI-Only PUSCH Transmission via Reserved MCS Field
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Solution Overview
Problem
The next-generation wireless communication system (5G or NR) lacks a method to indicate a channel state information (CSI)-only physical uplink shared channel (PUSCH) without an associated uplink shared channel (UL-SCH), which is necessary for efficient resource allocation and CSI reporting.
Innovation Solution
The solution involves toggling the New Data Indicator (NDI), setting the Modulation and Coding Scheme (MCS) field to a reserved state not indicating a target code rate, and triggering CSI reporting by setting the CSI request field to a non-zero value, allowing for CSI-only PUSCH transmission without UL-SCH data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional PUSCH indication methods are used, then the system maintains backward compatibility with existing protocols, but it cannot support CSI-only transmission without UL-SCH data
Solution Approach 1:
The patent changes the interpretation of existing DCI parameters by setting the MCS field to a reserved value (e.g., 31) and the NDI to a specific state, which signals to the wireless device that this is a CSI-only PUSCH transmission rather than a traditional data transmission. This allows the system to support new functionality using existing protocol fields without adding new message types.
Solution Approach 2:
The existing DCI format is made multi-functional by enabling it to indicate both traditional PUSCH transmissions with UL-SCH data and new CSI-only PUSCH transmissions without UL-SCH data. The same DCI structure serves multiple purposes depending on the values of specific fields, eliminating the need for separate indication mechanisms.
2Productivity
If CSI reporting is performed using existing PUSCH methods, then the CSI feedback is provided, but additional time-frequency resources are consumed due to associated UL-SCH data transmission
Solution Approach 1:
The patent extracts the CSI reporting function from the traditional PUSCH transmission that carries both data and CSI. By creating a dedicated CSI-only PUSCH transmission mode, the system separates CSI feedback from UL-SCH data transmission, allowing CSI reporting to occur without the overhead of associated data channels and reducing overall resource consumption.
3Adaptability or versatility
If the MCS field is set to indicate a target code rate, then the system maintains proper data transmission signaling, but it prevents indication of CSI-only PUSCH without UL-SCH
Solution Approach 1:
The patent utilizes the reserved state of the MCS field (value 31) to convey dual information: it indicates that this is a CSI-only transmission while simultaneously implying a default target code rate. This allows the system to signal CSI-only mode without completely losing the target code rate parameter, as the reserved value itself carries semantic meaning.
Data Source
AI summary
A network node configured to communicate with a wireless device is provided. The network node includes processing circuitry configured to indicate, for channel state information, CSI, reporting, a configuration of a physical uplink shared channel, PUSCH, without associated shared channel data, at least in part by: toggling a new data indicator and setting a modulation and coding scheme field where the set modulation and coding scheme field lacks an indication of a target code rate. Optionally CSI reporting is received based at least in part on the indication for CSI reporting.