Beamforming Control Signaling for mmWave Mobility
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Solution Overview
Problem
Millimeter Wave (mmWave) beamforming systems face challenges in achieving robust control-signaling transmission due to directional transmissions and vulnerability in propagation environments, particularly in cellular networks with dynamic user conditions and varying channel characteristics, where traditional protocols like IEEE 802.11ad are not suitable for mobility scenarios and result in network reselection latency.
Innovation Solution
A method is proposed where a base station allocates sets of downlink (DL) and uplink (UL) control resource blocks with corresponding beamforming weights to create control beams that cover the entire cell area, providing low-rate control signaling to facilitate high-rate data communication, and these control beams are provisioned indefinitely for synchronization and identification purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional IEEE 802.11ad protocols are used for beamforming control signaling, then the system can operate in isolated hot spot scenarios, but the network reselection time increases and service continuity is harmed in mobility scenarios
Solution Approach 1:
The patent segments control signaling into two distinct types: discovery signaling for initial network access and control signaling for ongoing communication. This segmentation allows optimized handling where discovery signaling uses traditional protocols while control signaling employs the new robust mechanism with synchronized beacon transmission, resolving the contradiction between hot spot operation simplicity and mobility scenario performance.
Solution Approach 2:
The patent introduces dynamic beacon transmission intervals that are synchronized across multiple access points, allowing the system to adapt to mobility conditions. The beacon transmission timing is dynamically adjusted to reduce network reselection time while maintaining service continuity, transforming the static IEEE 802.11ad approach into a dynamic system that responds to user movement.
2Power
If directional transmissions with narrow beams are used in mmWave systems, then high beamforming gains are achieved, but the system becomes vulnerable to propagation environment changes and channel variations
Solution Approach 1:
The patent implements continuous beacon transmission at synchronized intervals across all access points, ensuring that control signaling is continuously available even as users move through the cell. This continuous transmission maintains reliable control channel connectivity despite directional beam vulnerabilities, allowing the system to track and adapt to channel variations while maintaining high beamforming gains for data transmission.
Solution Approach 2:
The patent introduces a robust control signaling mechanism that acts as an intermediary between the directional data beams and the propagation environment. The synchronized beacon transmissions provide a stable reference that mediates the vulnerability of narrow beams to environmental changes, enabling the system to maintain reliability while preserving the high gain benefits of directional transmissions.
3Reliability
If control beams cover the entire cell area with moderate beamforming gain, then service continuity is maintained, but the data transmission rate is reduced
Solution Approach 1:
The patent segments the communication function into control signaling and data transmission, with control beams providing moderate gain for reliability and separate data beams providing high gain for throughput. This functional segmentation allows the system to maintain service continuity through robust control channels while achieving high data rates through optimized data transmission beams.
Solution Approach 2:
The patent applies different beamforming characteristics to different functions: moderate beamforming gain with wide coverage for control signaling to ensure service continuity, and high beamforming gain with narrow coverage for data transmission to maximize throughput. This local quality differentiation resolves the contradiction between reliability and productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the robustness of control-signaling in mmWave beamforming systems by ensuring continuous and efficient communication, reducing network reselection time, and maintaining service continuity in dynamic cellular environments.
Implementation Method 1
A base station allocates first sets of DL control resource blocks for DL transmission to a plurality of user equipments (UEs) in a beamforming network. Each set of DL control resource blocks is associated with a corresponding set of beamforming weights.
Implementation Method 2
A collection of the beamforming weights of the set of control beams create a radiation pattern that covers an entire service area of a cell.
Data Source
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AI summary
A method of control signaling in a beamforming system is proposed. A base station allocates a first sets of DL control resource blocks for DL transmission to a plurality of user equipments (UEs) in a beamforming network. Each set of DL control resource blocks is associated with a corresponding set of beamforming weights. The base station also allocates a second sets of UL control resource blocks for UL transmission from the UEs. Each set of UL control resource blocks is associated with the same corresponding set of beamforming weights. The base station transmits cell and beam identification information using a set of control beams. Each control beam comprises a set of DL control resource block, a set of UL control resource block, and the corresponding set of beamforming weights.