Uplink CoMP Fronthaul Scheduling for 6G Synchronization
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Solution Overview
Problem
Existing technologies fail to effectively address the constraints on fronthaul network scheduling in Coordinated Multipoint (CoMP) systems, leading to asynchronous uplink forwarding and reduced data rates in wireless access networks, particularly in 6G networks with centralized architectures like C-RAN.
Innovation Solution
A method and system for joint optimization of wireless access and fronthaul scheduling in CoMP systems, involving user association, resource block allocation, and slot allocation, using Time and Wavelength Division Multiplexing (TWDM) systems to ensure precise synchronization and minimize jitter, with modifications to the Media Access Control (MAC) layer and Multi-Point Control Protocol (MPCP) to maintain synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If centralized processing architecture (C-RAN) is implemented with high-bandwidth fronthaul links, then real-time network cooperative processing gain is enhanced, but precise synchronization for effective COMP coordination becomes challenging
Solution Approach 1:
The patent applies preliminary action by establishing synchronization mechanisms before COMP operations begin. The system pre-configures timing information, wavelength assignments, and slot allocations in the fronthaul network to ensure that multiple RRHs are ready for coordinated uplink reception from the same UE without requiring complex real-time synchronization adjustments during data transmission.
Solution Approach 2:
The patent replaces traditional mechanical/electrical synchronization methods with optical-based synchronization in the fronthaul network. By using wavelength-division multiplexing and optical time-division multiplexing, the system achieves precise timing coordination between multiple RRHs through the fronthaul links, substituting complex electrical synchronization mechanisms with optical communication-based timing reference distribution.
2Manufacturing precision
If multiple ONUs are scheduled in the same slot for COMP users, then precise synchronization is achieved, but wavelength and slot allocation complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the fronthaul network into multiple wavelength channels and time slots, allowing independent scheduling of different ONUs. Each wavelength can be allocated to different ONUs simultaneously without interference, and within each wavelength, time slots are further divided to accommodate multiple COMP users. This segmentation reduces the scheduling complexity by breaking down the large allocation problem into smaller, manageable sub-problems.
Solution Approach 2:
The patent resolves the scheduling complexity by adding a wavelength dimension to the existing time slot allocation. Instead of only scheduling ONUs in the time domain, the system simultaneously utilizes the wavelength domain, creating a two-dimensional scheduling matrix. This allows multiple ONUs to be scheduled in the same time slot if they are assigned different wavelengths, effectively increasing the scheduling capacity without proportionally increasing complexity.
3Quantity of substance
If constraints on the number of optical wavelengths are imposed in the uplink FH network, then wavelength availability is controlled, but the chain of coordinating base stations is broken and total data rate is significantly affected
Solution Approach 1:
The patent applies dynamics by implementing flexible wavelength allocation strategies that can adapt to different network conditions. The system dynamically assigns wavelengths to ONUs based on current traffic demands, channel conditions, and COMP requirements. This dynamic approach allows the network to optimize the balance between wavelength utilization and data rate performance, preventing fixed wavelength constraints from breaking the coordination chain while maintaining high throughput through adaptive resource allocation.
Data Source
AI summary
Provided is a system and method for joint optimization of wireless access and fronthaul in uplink scheduling of Coordinated Multipoint (COMP) users. The system comprises one or more user equipments (UE), two or more Optical Network Units (ONU), and at least one Optical Line Terminal (OLT). Wherein each ONU is communicably coupled with one RRH and comprises a first processing unit, and a buffer unit. Each of the RRHs transmits the received signal to the ONU via enhanced Common Public Radio Interface (eCPRI). The at least one OLT is collaboratively connected with the two or more ONUs, wherein the at least one OLT comprises a second processing unit and a playout buffer. The second processing unit processes Ethernet frames as received at the OLT from the at least pair of the ONUs from the corresponding COMP user, for retrieving the eCPRI frames and the playout buffer minimizes the jitter.