Reference Signal Configuration Avoiding Synchronization Collisions
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Solution Overview
Problem
In wireless communication systems, existing methods face challenges in accurately configuring and transmitting reference signals for channel measurement, leading to inefficiencies in channel state information acquisition and interference measurement, particularly due to collisions with synchronization and broadcast signals.
Innovation Solution
A method and apparatus for configuring and transmitting reference signals in wireless communication systems, where the user equipment determines subframes and resource elements for receiving reference signals, avoiding collisions with synchronization and broadcast signals, and the base station transmits this information to ensure accurate channel measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted in all configured subframes, then channel measurement accuracy is improved, but collisions with synchronization and broadcast signals increase
Solution Approach 1:
The patent extracts and removes reference signal transmissions from subframes where synchronization signals or broadcast signals are present. The base station identifies colliding subframes and excludes reference signals from those specific transmissions, thereby eliminating the harmful interference while maintaining reference signal transmissions in non-colliding subframes.
Solution Approach 2:
The patent applies preliminary action by having the base station pre-identify subframes that contain synchronization or broadcast signals before transmitting reference signals. The base station uses transmission information to determine which subframes are suitable for reference signal transmission, preventing collisions before they occur.
2Object-generated harmful factors
If reference signal transmission is avoided in subframes with synchronization or broadcast signals, then signal collision is reduced, but channel measurement opportunities are lost
Solution Approach 1:
The patent applies dynamics by making the reference signal transmission schedule flexible and adaptive. Instead of a fixed transmission pattern, the base station dynamically adjusts reference signal transmissions based on the presence of synchronization or broadcast signals in each subframe, transmitting only when conditions are favorable.
Solution Approach 2:
The patent discards reference signal transmissions in colliding subframes but recovers measurement opportunities in non-colliding subframes. The system selectively transmits reference signals only in subframes without synchronization or broadcast signals, thereby recovering full measurement capability in suitable time periods while avoiding interference in unsuitable ones.
3Measurement precision
If user equipment assumes base station does not transmit reference signals in colliding subframes, then reception accuracy is improved, but resource utilization decreases
Solution Approach 1:
The patent implements feedback by having the base station provide transmission information to the user equipment about which subframes contain synchronization or broadcast signals. This feedback enables the user equipment to accurately anticipate reference signal transmissions and configure its reception accordingly, improving reception accuracy without wasting resources on attempting to receive signals in colliding subframes.
Data Source
AI summary
A base station does not transmit any reference signal (RS) for channel measurement in a subframe in which transmission of an RS collides with transmission of a synchronization signal or a broadcast signal or in a resource block including the synchronization signal or the broadcast signal in the subframe. A user equipment assumes that any RS for channel measurement is not transmitted in a subframe or in a resource block when transmission of an RS collides with transmission of a synchronization signal or a broadcast signal in the subframe or in the resource block.