CSI Reporting Control via DCI Bit Field Reinterpretation
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Solution Overview
Problem
In future radio communication systems like LTE Rel. 14 and 5G, controlling aperiodic CSI reporting using a method different from existing LTE systems poses challenges, particularly in allocating uplink control channels for CSI transmission.
Innovation Solution
A user terminal receives downlink control information to determine the uplink channel for CSI transmission based on specific bit fields, RNTI, and DCI size, allowing flexible control of CSI reporting using either PUSCH or PUCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If aperiodic CSI reporting is controlled using a method different from existing LTE systems, then adaptability and flexibility of CSI transmission are improved, but device complexity and control difficulty increase
Solution Approach 1:
The patent applies parameter changes by reinterpreting existing DCI parameters (bit fields, RNTI types, DCI sizes) to control semi-persistent CSI reporting. Instead of introducing entirely new control mechanisms, the invention modifies the interpretation rules of existing parameters to achieve flexible CSI transmission control, thereby improving adaptability while limiting the increase in control complexity.
Solution Approach 2:
The patent implements multi-functionality by enabling DCI to serve multiple purposes: it not only schedules uplink data but also activates, deactivates, and controls semi-persistent CSI reporting. The same DCI structure and RNTI mechanisms are used for both data scheduling and CSI control, reducing overall system complexity while enhancing versatility.
2Reliability
If semi-persistent CSI reporting is activated using DCI, then CSI transmission quality is improved, but interpretation difficulty of control information increases
Solution Approach 1:
The patent uses RNTI as an intermediary to mediate between DCI and CSI reporting control. Different RNTI types (CS-RNTI, C-RNTI) serve as intermediaries that indicate different interpretation modes for DCI bit fields, helping the UE correctly interpret DCI for CSI activation/deactivation without increasing overall interpretation difficulty.
Solution Approach 2:
The patent applies local quality by making the interpretation of specific DCI bit fields context-dependent. The same bit field may have different meanings based on the RNTI used and the DCI size, allowing precise local control of CSI reporting parameters while maintaining a unified DCI structure.
3Productivity
If uplink control channel resources are dynamically allocated for CSI transmission, then resource utilization efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The patent merges CSI reporting control with uplink data scheduling by using the same DCI structure for both purposes. When uplink data is scheduled, the same DCI can simultaneously activate or deactivate semi-persistent CSI reporting, thereby combining multiple control functions into a single signaling message and reducing overall overhead.
Solution Approach 2:
The patent implements multi-functionality where DCI serves dual purposes: scheduling uplink data transmission and controlling semi-persistent CSI reporting. This universal approach allows a single control message to accomplish multiple tasks, improving resource utilization while limiting the increase in signaling overhead.
Data Source
AI summary
To appropriately control CSI reporting even when CSI reporting is performed by applying a method different from a method used in existing LTE systems. A user terminal includes: a receiving section that receives downlink control information indicating activation or deactivation of semi-persistent channel state information; and a control section that controls transmission of the semi-persistent channel state information by making an interpretation of a certain bit field included in the downlink control information based on an RNTI applied to a CRC of the downlink control information.