Probing Pilot Signal Node Selection in Combined Cell Deployment
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Solution Overview
Problem
In heterogeneous wireless communication networks with combined cell deployments, identifying the suitable network node for data transmission to a wireless device operating in MIMO mode is challenging, leading to resource wastage and reduced capacity due to the need for frequent handovers and simultaneous signal transmission from multiple nodes.
Innovation Solution
A method involving the transmission of unique probing pilot signals and channel state parameters from network nodes to a wireless device, allowing a central controller to determine which node is closest and most suitable for data transmission, enabling spatial reuse and reducing resource wastage by assigning specific nodes for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple network nodes transmit signals simultaneously to a wireless device in a combined cell deployment, then signal coverage and reliability are improved, but resource wastage increases and network capacity is reduced
Solution Approach 1:
The system performs preliminary actions by transmitting probing pilot signals from multiple network nodes before actual data transmission. The wireless device measures these pilot signals and feeds back channel state information, allowing the central controller to pre-identify the optimal network node for data transmission, thereby avoiding resource wastage during actual communication
Solution Approach 2:
The system implements feedback mechanisms where the wireless device measures probing pilot signals from multiple network nodes and feeds back channel state parameters to the central controller. This feedback loop enables the central controller to identify the closest and most suitable network node for data transmission, optimizing resource allocation and reducing simultaneous transmission requirements
2Adaptability or versatility
If frequent handovers are performed between network nodes, then adaptability to mobile devices is improved, but device complexity and resource consumption increase
Solution Approach 1:
The system performs preliminary identification of the optimal network node by measuring probing pilot signals before actual data transmission begins. This pre-identification reduces the frequency of handovers by establishing the correct network node connection upfront, thereby reducing the complexity of handover management while maintaining adaptability to mobile devices
3Measurement precision
If probing pilot signals are transmitted from all network nodes, then accurate node identification is improved, but energy consumption and signal interference increase
Solution Approach 1:
The system applies partial action by having network nodes transmit probing pilot signals only when necessary for initial connection establishment or handover decisions, rather than continuously. This selective transmission achieves accurate node identification for critical decisions while reducing overall energy consumption and signal interference compared to continuous transmission from all nodes
Data Source
AI summary
The embodiments herein relates to a method in a communications network. A first probing pilot signal is transmitted from a first network node to a wireless device. The first probing pilot signal is unique for the first network node. A second signal is transmitted from the first network node to the wireless device. The second signal is unique for the first network node. The first probing pilot signal together the second signal enables identification of that the first network node is suitable to transmit data to the wireless device. A first and second set of channel state parameters is transmitted from the wireless device to the central network node which identifies that the first network node is suitable to transmit data to the wireless device since it is substantially close to the first network node.