Uplink-Downlink Decoupling in Heterogeneous Wireless Networks
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Solution Overview
Problem
In heterogeneous wireless telecommunications networks, the uplink and downlink boundaries often differ due to varying transmit powers of macro and small cell base stations, leading to uplink-downlink imbalances that cause interference and require efficient decoupling mechanisms to manage traffic and interference effectively.
Innovation Solution
The method involves determining a radio condition trigger for uplink-downlink decoupling opportunities, transmitting decoupling preparation information to user equipment, and awaiting an implementation trigger to activate or deactivate uplink-downlink decoupling, allowing for fast and efficient switching between macro and small cell base stations to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink-downlink decoupling is implemented to reduce interference in heterogeneous networks, then network performance is improved, but device complexity increases due to the need for separate uplink and downlink cell management
Solution Approach 1:
The patent segments the uplink and downlink cell selection processes by introducing separate criteria for downlink cell identification (via measurement reports) and uplink cell identification (via network configuration messages). This allows independent optimization of each direction while managing complexity through structured information exchange between network and device.
Solution Approach 2:
The patent applies preliminary action by having the network pre-identify and configure candidate uplink cells before actual decoupling operation. The network provides uplink cell configuration information in advance, including cell identities and resource allocation parameters, so that when decoupling is activated, the device can immediately switch without complex real-time calculations.
2Productivity
If fast switching between macro and small cell base stations is implemented, then interference is reduced and network capacity is optimized, but signal measurement and cell selection precision requirements increase
Solution Approach 1:
The patent implements feedback mechanisms where the device continuously measures downlink signal quality from multiple cells and reports measurements to the network. The network uses this feedback to determine optimal uplink-downlink decoupling configurations and provides configuration updates to the device, enabling fast switching based on accurate, continuously refined signal measurements.
Solution Approach 2:
The patent replaces complex real-time signal analysis and cell selection mechanics with a simplified system where the network performs the heavy measurement and decision-making work. The device only needs to execute network-provided configuration commands, substituting sophisticated device-side signal processing with network-side intelligence and pre-computed switching decisions.
Data Source
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AI summary
Aspects and embodiments described provide a wireless telecommunications network user equipment method, a wireless telecommunications network control node method, user equipment, network control node and computer program product operable to perform those methods. The wireless telecommunications network user equipment method comprises: determining a radio condition trigger indicative of an uplink-downlink decoupling opportunity; transmitting a decoupling opportunity notification if the radio condition trigger is met at user equipment; receiving decoupling preparation information relating to the uplink-downlink decoupling opportunity; and awaiting receipt of an implementation trigger to implement the uplink downlink decoupling. Aspects recognise that preconfigured decoupling information provided to user equipment may provide a flexible means for a network to select and implement an uplink-downlink decoupling cell combination on issuance of an appropriate order. A network may be operable to delay a decision regarding when exactly to initiate decoupling and in relation to which cell combination to select until an appropriate point, thus providing maximum flexibility.