Multi-Point Wireless Cell Identity Layout for Coordinated Uplink
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Solution Overview
Problem
Existing wireless communication systems struggle to efficiently utilize multiple transmission/reception points within the same cell with the same physical cell identity (PCI), leading to inefficiencies in both downlink and uplink communications due to the limitations of existing 3GPP LTE standards.
Innovation Solution
A wireless communication system that employs a first transmission/reception point with wider coverage and a virtual cell identity, allowing multiple transmission/reception points within the same cell to coordinate downlink and uplink communications by using the same physical cell identity for synchronization signals, reference signals, and channel transmissions, while introducing a virtual cell identity for uplink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmission points use different physical cell identities (PCIs) as in existing standards, then each point has individual cell coverage and standards can be applied, but coordination efficiency deteriorates and performance varies due to delay and estimation errors
Solution Approach 1:
The patent merges multiple transmission points into a single logical cell by assigning them the same physical cell identity (PCI). This combining approach allows the transmission points to coordinate more efficiently as part of a unified cell structure, while the network node maintains separate identification of each transmission point through alternative means, thus improving coordination efficiency without excessive complexity
Solution Approach 2:
The patent introduces a network node as an intermediary that manages the assignment of virtual cell identities to terminal devices. This intermediary coordinates the communication between multiple transmission points sharing the same PCI and the terminal devices, resolving identification conflicts and improving overall system coordination efficiency
2Reliability
If multiple transmission points share the same physical cell identity (PCI), then coordination efficiency improves, but existing standards cannot be applied and compatibility deteriorates
Solution Approach 1:
The patent segments the cell identity function into two parts: physical cell identity (PCI) shared by multiple transmission points for improved coordination, and virtual cell identity (VCID) assigned to terminal devices for maintaining standard compatibility. This segmentation allows the system to simultaneously achieve better coordination efficiency and maintain compatibility with existing communication standards
Solution Approach 2:
The patent changes the parameter of cell identity from being unique per transmission point (traditional approach) to being shared across multiple transmission points (new approach). By introducing virtual cell identities as an additional parameter layer, the system maintains compatibility with existing standards that expect unique cell identities while enabling multiple transmission points to share the same physical cell identity for improved coordination
3Measurement precision
If accurate wireless channel information is required for joint transmission, then transmission performance improves, but performance easily varies with delay and estimation errors
Solution Approach 1:
The patent implements preliminary channel estimation and information exchange between the network node and terminal devices before actual data transmission. By obtaining channel state information in advance and sharing it with relevant transmission points, the system reduces the impact of delay and estimation errors during the actual transmission process, thereby stabilizing performance while maintaining accurate channel information
Data Source
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AI summary
Disclosed is a wireless communication system using multiple transmission and reception points. In a wireless communication system having a first transmission and reception point and at least one second transmission and reception point belonging to the same cell, the first transmission and reception point has a wider transmission area than the at least one second transmission and reception point, and the first transmission and reception point and the at least one second transmission and reception point generate downlink transmission signals by using the same physical layer cell ID or virtual cell IDs allocated to each terminal, and then the terminals generate uplink transmission signals by using the allocated virtual cell IDs.