Multiple-Serving Nodes for UL/DL Power Imbalance in LTE-A
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Solution Overview
Problem
In wireless communication systems, particularly in LTE-A networks, the power imbalance between uplink (UL) and downlink (DL) transmissions due to differences in base station and relay node transmission powers leads to difficulties in wireless device node selection, affecting signal strength and overall network performance.
Innovation Solution
The implementation of multiple-serving nodes with independent and distributed control channel structures allows for separate management of UL and DL transmissions, enabling wireless devices to communicate with different nodes based on signal strength and quality, thereby mitigating power imbalances and improving network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a wireless device selects a base station or relay node based on average downlink signal strength, then the device can simplify its node selection process, but the uplink signal strength becomes weaker due to UL/DL power imbalance
Solution Approach 1:
The patent segments the control channel management by introducing separate control channels for downlink (PDCCH from first node) and uplink (PUCCH to second node). This allows independent optimization of DL and UL transmissions, where the device can select nodes based on DL signal strength while the network manages UL power separately, resolving the contradiction between simplified selection and UL signal strength.
2Loss of energy
If relay node transmission power is reduced to save energy, then energy consumption decreases, but the uplink signal strength received by the relay node becomes weaker
Solution Approach 1:
The patent introduces a backhaul communication link as an intermediary between the first node (base station) and second node (relay node). The first node provides uplink power control information to the wireless device through this intermediary, enabling the relay node to operate at lower power while the base station coordinates to maintain overall UL signal strength through centralized power control management.
3Adaptability or versatility
If separate control channels are implemented for downlink and uplink, then independent management of UL and DL transmissions is enabled, but the control channel structure becomes more complex
Solution Approach 1:
The patent segments the control channel into distinct DL control channel (PDCCH) and UL control channel (PUCCH) with separate nodes for transmission and reception. This segmentation enables independent management of UL and DL transmissions, allowing flexible node selection and power control while maintaining clear separation of functions, thus achieving adaptability without excessive complexity.
Data Source
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AI summary
Methods, devices and systems for a wireless communication system using multiple-serving nodes are provided. In one embodiment, a method of wireless communication comprises sending from a wireless device an uplink control signal to a first node via a second node using a second communication link; receiving by said wireless device a downlink control signal from said first node using a first communication link; sending from said wireless device another uplink control signal to said second node using said second communication link; and receiving by said wireless device another downlink control signal from said second node via said first node using said first communication link.