CoMP Anchor Base Station PDCP Segmentation
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Solution Overview
Problem
In mobile communication systems, Coordinated Multi-Point (CoMP) techniques face challenges in efficiently managing communication resources and data transmission across multiple base stations, leading to suboptimal performance and communication quality, especially for user terminals at the edge of coverage areas.
Innovation Solution
A mobile communication system architecture that includes a CoMP cooperating set with an anchor base station and subordinate stations, utilizing a controller with processor functions across multiple layers (PDCP, RLC, MAC, and PHY) to coordinate data transmission and HARQ retransmissions, and employing advanced band allocation and timing advance control mechanisms to optimize resource usage and data synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CoMP techniques are implemented across multiple base stations, then communication quality and throughput are improved, but device complexity and resource management difficulty increase
Solution Approach 1:
The system segments the CoMP functionality by designating one base station as the anchor base station and others as subordinate base stations. Each base station handles specific tasks: the anchor base station manages PDCP layer operations and overall coordination, while subordinate base stations focus on transmission and reception. This segmentation reduces the complexity burden on individual base stations while maintaining overall CoMP functionality.
Solution Approach 2:
The anchor base station acts as an intermediary between the core network and subordinate base stations. It receives user data from the core network, converts it to PDCP data units with sequence numbers, and distributes them to subordinate base stations. This intermediary role simplifies the coordination complexity by centralizing control functions at the anchor base station.
2Productivity
If multiple base stations transmit data simultaneously to user terminals, then throughput is improved, but data synchronization difficulty increases
Solution Approach 1:
The anchor base station performs preliminary actions by converting user data to PDCP data units with sequence numbers before distribution. This preliminary processing ensures that all subordinate base stations receive properly formatted and sequenced data, facilitating synchronized transmission. The timing advance control mechanisms further ensure that transmissions from multiple base stations are time-synchronized.
3Reliability
If PDCP data units with sequence numbers are transmitted across base stations, then data integrity is improved, but processing complexity increases
Solution Approach 1:
The system segments the processing complexity by concentrating PDCP layer operations at the anchor base station. Only the anchor base station performs the complex task of converting user data to PDCP data units with sequence numbers, while subordinate base stations handle simpler transmission and reception tasks. This segmentation maintains data integrity through proper sequencing while distributing processing complexity across the CoMP set.
Data Source
AI summary
A mobile communication system includes a first base station, a second base station connected with the first base station via an X2 interface, and a user terminal configured to receive data from both the first and second base stations using radio resources provided by both the first and second base stations. The first base station comprises a controller including at least one processor, the controller executing functions of plural layers. The plural layers include a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer. The controller is configured to receive user data addressed to the user terminal from a core network, convert the user data to PDCP data unit provided with a sequence number, in the PDCP layer, and transmit the PDCP data unit to the second base station from the PDCP layer.