CSI-RS Configuration Coding to Prevent Multi-Cell Signal Collisions
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Solution Overview
Problem
Existing wireless communication systems face limitations in distinguishing between downlink channels of different cells due to the implicit mapping of CRS configuration with cell identifiers, leading to potential collisions in CoMP systems, especially when notifying reference signal configuration information.
Innovation Solution
Notifying CSI-RS configuration information in the form of a code that includes the number of ports, pilot pattern, pilot period, and sub-frame offset, along with data muting positions and periods, to ensure that CSI-RSs of multiple cells do not collide, thereby reducing overhead and ensuring accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If implicit mapping binding pilot pattern with cell identifier is used to notify CRS configuration information, then the notification method is simple, but the number of downlink channels of different cells that can be distinguished is limited and CRS collisions occur in CoMP systems
Solution Approach 1:
The patent changes the notification parameter from implicit cell ID-based mapping to explicit CSI-RS configuration information code, allowing flexible configuration of pilot pattern, period, and subframe offset to avoid collisions while maintaining simple notification
Solution Approach 2:
The patent introduces an intermediary mapping table that maps CSI-RS configuration information codes to specific configuration parameters, enabling the network device to notify UE of detailed CSI-RS configurations without directly transmitting complex parameter sets
2Reliability
If detailed CSI-RS configuration information is transmitted to avoid collisions, then collision avoidance is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the configuration notification into two parts: a compact configuration information code and a pre-stored mapping table, separating the signaling overhead from the detailed configuration data to minimize overhead while ensuring complete information transmission
Solution Approach 2:
The patent performs preliminary action by pre-storing the mapping relationship between configuration information codes and detailed parameters in both network device and UE, eliminating the need to transmit redundant information during actual CSI-RS configuration notification
Data Source
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AI summary
Embodiments of the present invention disclose a method and a device for notifying reference signal configuration information, and relate to the field of communications technologies. The method includes: coding, according to channel state information-reference signal (CSI-RS) configuration information, the CSI-RS configuration information, to obtain a CSI-RS configuration information code; storing a mapping relation between the CSI-RS configuration information code and the CSI-RS configuration information, and sending the mapping relation to a UE for storage; searching, in the stored mapping relation between the CSI-RS configuration information code and the CSI-RS configuration information, for a CSI-RS configuration information code corresponding to CSI-RS configuration information to be notified; and sending the found CSI-RS configuration information code to the UE, so that the UE determines CSI-RS configuration information according to the received CSI-RS configuration information code and the mapping relation between the CSI-RS configuration information code and the CSI-RS configuration information, where the mapping relation between the CSI-RS configuration information code and the CSI-RS configuration information is stored by the UE. In the embodiments of the present invention, the CSI-RS configuration information is notified to the UE in the form of the CSI-RS configuration information code, so that the UE determines the CSI-RS configuration information according to the CSI-RS configuration information code, thus not only lowering the overhead, but also ensuring that CSI-RSs of multiple cells do not collide with each other.