Mobile Station HARQ-ACK and CSI Transmission Control
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Solution Overview
Problem
Current mobile communication systems lack a specific description for the process of transmitting Hybrid Automatic Repeat Request (HARQ)-ACK and Channel State Information (CSI) between base station devices and mobile station devices, particularly in scenarios where these signals collide in a sub-frame.
Innovation Solution
A mobile communication system that allows mobile station devices to receive parameters for determining whether to transmit HARQ-ACK and CSI using specific physical uplink control channel formats, dropping CSI if simultaneous transmission is not allowed, and using different formats based on whether signals collide or correspond to primary or secondary cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simultaneous transmission of HARQ-ACK and CSI is not allowed, then transmission conflict is avoided, but communication efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the transmission behavior adaptable based on collision detection and cell type. The mobile station device dynamically determines whether to simultaneously transmit HARQ-ACK and CSI or to drop CSI, based on whether collision occurs and whether the PDSCH is on primary or secondary cell. This dynamic adjustment resolves the contradiction between transmission reliability and communication efficiency.
Solution Approach 2:
The patent changes the transmission parameter (whether to transmit CSI) based on detected conditions (collision occurrence and cell type). By changing this parameter dynamically according to the situation, the system achieves both reliable transmission (avoiding conflicts when necessary) and efficient communication (allowing simultaneous transmission when appropriate).
2Reliability
If CSI is dropped when collision occurs, then transmission conflict is avoided, but information loss increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of CSI based on the local condition of cell type. When PDSCH is on primary cell, CSI is dropped to ensure reliable HARQ-ACK transmission. When PDSCH is on secondary cell, simultaneous transmission is allowed, preserving CSI information. This localized differentiation resolves the contradiction between avoiding transmission conflicts and preventing information loss.
3Adaptability or versatility
If multiple PUCCH formats are used, then transmission flexibility increases, but device complexity increases
Solution Approach 1:
The patent segments the transmission scenarios into distinct categories based on collision occurrence and cell type (primary vs. secondary). For each segment, a specific PUCCH format is selected: Format 1a/1b for non-simultaneous transmission, Format 2/2a/2b for simultaneous transmission on primary cell, and Format 3 for simultaneous transmission on secondary cell. This segmentation approach provides transmission flexibility while managing device complexity through clear conditional logic.
Data Source
AI summary
A mobile communication system, a base station device, a mobile station device, a communication method, and an integrated circuit that each can efficiently transmit HARQ-ACK and/or channel state information are provided. A mobile station device includes means for receiving a first parameter that is used for instructing whether simultaneous transmission of information relating to HARQ-ACK and channel state information is allowed or not; and means for receiving a second parameter that is used for instructing whether simultaneous transmission of the information relating to HARQ-ACK and the channel state information is allowed or not, and controls a transmission method of the information relating to HARQ-ACK and the channel state information based on the first parameter, the second parameter, and whether or not the information relating to HARQ-ACK corresponds to transmission on a single physical downlink shared channel only on a primary cell.