C-RAN Packet Routing via User Location Estimation
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Solution Overview
Problem
Conventional Centralized Radio Access Networks (C-RAN) face inefficiencies in packet transmission between the baseband unit and remote radio heads, leading to excessive network traffic due to the need to send packets to all remote radio heads within a cell, even when not all are necessary for user device communication.
Innovation Solution
A method that involves receiving preambles from remote radio heads, determining type-2 downlink packets, reorganizing them if resource blocks are insufficient, estimating user device location, and selectively sending type-3 downlink packets to the appropriate remote radio heads based on modified coordinates, thereby reducing packet traffic by utilizing a remote radio head arrangement table to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the baseband unit sends packets to all remote radio heads when all RRHs belong to the same cell, then the user end device can receive packets, but the network traffic between the baseband unit and remote radio heads becomes excessively occupied
Solution Approach 1:
The patent applies local quality by determining the specific location of the user end device and selectively sending packets only to remote radio heads in that local area. Instead of broadcasting to all RRHs uniformly, the system identifies which specific RRHs are needed based on the user's position, thereby reducing overall network traffic while maintaining reliable packet delivery to the target device
Solution Approach 2:
The patent segments the network traffic by dividing it into different types (type-1, type-2, type-3 packets) and routing them through different paths. Type-1 packets are sent to all RRHs, while type-2 and type-3 packets are selectively sent only to specific RRHs based on user location. This segmentation allows the system to reduce traffic volume for certain packet types without compromising delivery reliability
2Reliability
If the baseband unit sends packets to all remote radio heads to ensure coverage, then packet delivery is reliable, but the complexity of connections increases
Solution Approach 1:
The patent implements dynamics by making the packet routing adaptive to user device location. The system dynamically determines which remote radio heads should receive packets based on real-time position information. This dynamic approach reduces connection complexity by establishing connections only when and where needed, rather than maintaining static connections to all RRHs, while still ensuring reliable delivery to the target user device
3Productivity
If the number of resource blocks for PDCCH is insufficient for multiple type-2 downlink packets, then control signal transmission is constrained, but reorganizing packets based on RRH arrangement optimizes resource usage
Solution Approach 1:
The patent applies merging by combining multiple type-2 downlink packets into fewer packets when resource blocks are insufficient. The system reorganizes packets based on the remote radio head arrangement table, merging packets destined for adjacent RRHs into shared transmissions. This merging increases transmission efficiency by better utilizing limited resource blocks, while the automated reorganization process manages the complexity through systematic rules
Data Source
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AI summary
A method for controlling C-RAN applicable for a C-RAN having a plurality of remote radio heads (RRH) and a baseband unit (BBU) includes the following steps: collecting a first uplink signal corresponding to a first user end device, determining a first estimated region based on a communication range of part of RRH's receiving the first uplink signal, setting N estimated coordinates in the first estimated region wherein N is larger than one, giving N moving directions to the N estimated coordinates, modifying the N estimated coordinates based on a maximum displacement and the N moving directions, and selecting at least one RRH to send a type-3 downlink packet to the first user end device based on the N modified estimated coordinates.