Secondary PUCCH Carrier for Micro Cell CSI Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE systems employing inter-site carrier aggregation, the existing technology limits the feedback of channel state information (CSI) from user equipment (UE) to only the macro cell base station, which can result in suboptimal system performance due to better link conditions with the micro cell base station.
Innovation Solution
A method for component carrier configuration is introduced, where a base station generates and transmits secondary cell configuration information to a user equipment, allowing the UE to activate a secondary primary cell associated with the micro cell base station for transmitting Physical Uplink Control Channel (PUCCH) feedback, enabling CSI feedback on the uplink working carrier of the micro cell base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE feeds back channel state information only to the macro cell base station, then the control plane connectivity and mobility management are maintained, but the system performance is suboptimal due to worse link conditions with the macro cell compared to the micro cell
Solution Approach 1:
The patent segments the feedback function by introducing a secondary PUCCH carrier that is separate from the primary PUCCH carrier. The secondary PUCCH carrier is specifically configured for CSI feedback to the micro cell, while the primary PUCCH carrier maintains control plane connectivity with the macro cell. This segmentation allows the system to exploit better link conditions with the micro cell for data feedback while preserving mobility management through the macro cell.
Solution Approach 2:
The patent introduces a secondary PUCCH carrier as an intermediary mechanism that enables the UE to provide CSI feedback to the micro cell without compromising the existing control plane architecture. This intermediary carrier acts as a dedicated channel for exploiting superior link conditions with the micro cell, while the primary PUCCH carrier continues to handle mobility and control functions through the macro cell.
2Productivity
If the PUCCH is only transmitted on the primary component carriers of the macro cell, then the mobility management and control plane functions are simplified, but the uplink data transmission capacity and connectivity are limited by the macro cell's longer transmission distance
Solution Approach 1:
The patent adds another dimension to the PUCCH transmission architecture by introducing a secondary PUCCH carrier that operates independently from the primary carrier. This secondary carrier is associated with the micro cell and provides an additional transmission path that is not constrained by the macro cell's transmission distance limitations. The UE can now transmit PUCCH on both primary and secondary carriers, effectively utilizing the micro cell's shorter transmission distance for high-capacity data feedback.
3Productivity
If the inter-site carrier aggregation technique is employed, then the system throughput is enhanced via the micro cell base station, but the existing PUCCH design must be modified to support feedback on micro cell carriers
Solution Approach 1:
The patent applies local quality by configuring the secondary PUCCH carrier with specific properties tailored for micro cell interaction. The secondary carrier is specifically designed for CSI feedback to the micro cell, while the primary carrier maintains its traditional role for macro cell control plane functions. This localized specialization allows the system to optimize throughput through the micro cell without requiring a complete redesign of the overall PUCCH architecture.
Data Source
AI summary
A method for component carrier configuration is provided. The method includes: generating, by a Base Station (BS), secondary cell (SCell) configuration information and transmitting it to a User Equipment (UE); transmitting, by the BS, an SCell activation request for the UE to a micro BS and receiving from the micro BS an SCell activation response to the SCell activation request; and transmitting, by the BS, SCell activation information to the UE if the received SCell activation response indicates that the SCell activation request is accepted by the micro BS. The SCell configuration information contains group numbers and indices of SCells associated with the BS and the micro BS, respectively, and indicates a secondary primary cell (S-PCell) associated with the micro BS. The present invention also provides a BS and a UE. With the method for component carrier configuration and the corresponding BS and UE according to the present invention, the channel state information of the UE can be fed back on an uplink working of the micro cell base station.