Wireless Network Signaling for Inter-Cell Interference Mitigation
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Solution Overview
Problem
In LTE wireless communication systems, legacy mobile terminals face challenges in accessing and utilizing resources in heterogeneous networks due to severe inter-cell interference, especially when they cannot detect control and synchronization signals from secondary component carriers, leading to reduced throughput and inefficient resource utilization.
Innovation Solution
The solution involves transmitting parameters such as cell identity and the number of transmit antenna ports associated with a secondary cell over a primary cell, allowing mobile terminals to derive necessary physical layer characteristics even if they cannot detect these signals directly, thereby enabling access to additional resources and improving channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If legacy mobile terminals attempt to access secondary component carriers in heterogeneous networks, then resource utilization and throughput can be improved, but severe inter-cell interference prevents detection of control and synchronization signals
Solution Approach 1:
The patent uses the primary cell as an intermediary to convey secondary cell parameters. Instead of requiring direct detection of secondary cell signals (which fails due to interference), the network node transmits secondary cell identity and antenna port information through the primary cell's control channels, enabling terminals to access secondary carriers despite interference conditions
Solution Approach 2:
The network node performs preliminary transmission of secondary cell parameters before the terminal attempts to access the secondary carrier. By providing cell identity and antenna port information in advance through RRC signaling or physical downlink control channels on the primary cell, the terminal is prepared to correctly receive and process secondary cell transmissions
2Productivity
If mobile terminals monitor all configured component carriers for PDCCH and PDSCH, then complete resource utilization is achieved, but power consumption increases due to wider receiver bandwidth and higher sampling rates
Solution Approach 1:
The patent enables dynamic activation and deactivation of component carriers based on terminal capability and network conditions. Legacy terminals can be configured with secondary carriers but only activated when needed, allowing the system to optimize between resource utilization and power consumption by adjusting the active carrier set dynamically through MAC control elements
3Productivity
If carrier aggregation is implemented to allow legacy terminals to be scheduled in all parts of wideband carriers, then spectrum efficiency improves, but device complexity increases due to multiple component carrier configuration and monitoring
Solution Approach 1:
The patent segments the wideband carrier into multiple component carriers with distinct functions. The primary cell handles essential control and synchronization functions for legacy terminals, while secondary cells provide additional data capacity. This segmentation allows legacy terminals to operate on the primary cell without complexity, while advanced terminals can utilize secondary cells for enhanced throughput
Data Source
AI summary
A mobile terminal receives, over a first cell configured on a carrier frequency, at least one parameter associated with a second cell configured on a carrier frequency. The at least one parameter comprises a cell identity. The mobile terminal then derives at least one physical layer characteristic for the second cell based on the received at least one parameter. Thereby, the mobile terminal is able to receive transmissions over the second cell, even if it could not initially detect the presence of the cell.