Millimeter-Wave Small Cell Synchronization and Beamforming
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Solution Overview
Problem
The increasing number of wireless device users and data transmission demands have outpaced the available bandwidth, necessitating a solution to enhance wireless communication efficiency, particularly in areas with high user density and congested coverage.
Innovation Solution
Implementing millimeter-wave capable small cells (MCSCs) as booster cells or secondary carriers within existing eNB systems, which offload traffic and provide efficient signal delivery through beamforming and handover processes, utilizing customized synchronization signals and physical random access channels to manage user equipment communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the density of nodes is increased to accommodate more data transmission, then network capacity and bandwidth availability are improved, but device complexity and interference management become more difficult
Solution Approach 1:
The patent segments the network into small cells with unique cell identities, allowing each node to be independently identified and managed. This segmentation enables scalable network expansion without proportionally increasing management complexity, as each small cell operates with its own synchronization signals and reference signals for independent detection and measurement.
2Productivity
If small cells are deployed to increase network capacity, then data transmission efficiency is improved, but signal quality and synchronization become more challenging in high-density environments
Solution Approach 1:
The patent implements cell-specific synchronization signals and reference signals that are locally optimized for each small cell's environment. These signals include cell identity information and are designed to be detectable in high-density deployments, ensuring each small cell maintains reliable signal quality and synchronization independently of neighboring cells.
3Productivity
If millimeter-wave frequencies are used for small cell communication, then bandwidth and data rates are increased, but signal penetration and coverage range are reduced
Solution Approach 1:
The patent employs beamforming techniques that add spatial dimensionality to millimeter-wave communication. By directing signals in specific spatial directions rather than omnidirectional transmission, the system extends effective coverage range while maintaining high data rates. The beamforming approach compensates for millimeter-wave limitations by concentrating energy in targeted directions, effectively expanding coverage without sacrificing bandwidth benefits.
Data Source
AI summary
Technology described herein relates to systems, methods, and computer readable media to enable a millimeter wave capable small cell (MCSC) devices to receive a handover of a user equipment from a universal mobile telecommunications system terrestrial radio access node B (eNB). In particular, systems and methods are described for user equipment (UE) association with a MCSC operating as a booster for an eNB in a time division duplexing (TDD) system, including identification of and communication on preferred cell sector between the UE and the MCSC. Protocols for concurrently performing a beam search and time and frequency synchronization for downlink communication are also described. Several sub-frame designs to facilitate these protocols are also described.