Multiple-Serving Nodes for Wireless Device Node Selection
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Solution Overview
Problem
In wireless communication systems, 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 data throughput.
Innovation Solution
The implementation of multiple-serving nodes with independent and distributed control channel structures allows for separate management of DL and UL signals, enabling wireless devices to communicate effectively with multiple nodes based on signal strength and quality, thereby mitigating power imbalances and optimizing data transmission.
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 node selection process into separate DL and UL measurements. The device measures DL signal strength from each node independently and UL signal strength separately, then combines these measurements to make an informed selection decision. This segmentation allows the device to account for UL/DL power imbalance without complicating the overall selection process
Solution Approach 2:
The patent changes the selection parameter from solely DL signal strength to a composite parameter that includes both DL and UL signal strengths. By adjusting the selection criterion to consider both directions of communication, the system compensates for power imbalance while maintaining operational simplicity
2Loss of energy
If relay nodes transmit at lower power compared to base stations, then energy consumption is reduced and interference is minimized, but uplink signal strength from wireless devices to relay nodes becomes weaker
Solution Approach 1:
The patent implements feedback mechanisms where wireless devices measure both DL and UL signal strengths and report these measurements to the network. This feedback enables the system to identify when a device connected to a low-power RN experiences poor UL conditions, triggering reassignment to a BS or different RN to optimize both energy efficiency and signal quality
Solution Approach 2:
The patent introduces dynamic node assignment where the serving node (BS or RN) is not fixed but can change based on measured signal conditions. Devices can be dynamically reassigned between BS and RN based on real-time DL and UL measurements, allowing the system to adapt to changing power and signal conditions
3Adaptability or versatility
If multiple base stations and relay nodes operate in a heterogeneous network, then network coverage and capacity are improved, but significant power differences between nodes create uplink and downlink power imbalance
Solution Approach 1:
The patent segments the heterogeneous network into distinct measurement domains for DL and UL. By separately measuring and evaluating signal strengths in each direction to different nodes, the system can identify and correct power imbalance issues without compromising the benefits of network heterogeneity
Solution Approach 2:
The patent changes the evaluation parameter from single-direction (DL only) signal strength to bidirectional (DL and UL) signal strength. This parameter change enables the system to maintain the adaptability and coverage benefits of heterogeneous networks while correcting the power imbalance through informed node selection
Data Source
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 first node a downlink control signal to a wireless device using a first communication link; receiving by said first node an uplink control signal from said wireless device via a second node using a third communication link; and forwarding by said first node another downlink control signal from said second node to said wireless device using said third communication link and said first communication link.