Broadcast Control Channel Decoding Using Dense Reference Signals
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Solution Overview
Problem
Current methods for determining reference signals for channel estimation of broadcast control channels in wireless communications are insufficient, leading to failed decoding due to incorrect assumptions about numerology, resulting in unresolved channels and decoding failures.
Innovation Solution
A method where user equipment (UE) identifies and uses reference signals with the same numerology as the broadcast control channel, with a base station configuring and transmitting more dense reference signal patterns during the same subframe as the broadcast control channel, ensuring sufficient reference signals for successful single-symbol channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current methods for determining reference signals are used, then the system operates with standard reference signal patterns, but channel estimation fails due to incorrect numerology assumptions
Solution Approach 1:
The patent changes the reference signal pattern parameters to match the numerology of the broadcast control channel. Specifically, when the MCCH uses a first numerology (e.g., 15 kHz subcarrier spacing), the reference signals are configured with the same first numerology rather than a second numerology (e.g., 30 kHz subcarrier spacing). This parameter alignment ensures that channel estimation can be performed correctly on single-symbol subframes.
Solution Approach 2:
The patent segments the reference signal configuration into different patterns based on the MCCH numerology. A first reference signal pattern is used when the MCCH has a first numerology, and a second reference signal pattern is used when the MCCH has a second numerology. This segmentation allows the system to select the appropriate reference signal pattern to match the MCCH characteristics.
2Quantity of substance
If reference signals with different numerology are used, then resource overhead is reduced, but decoding fails due to unresolved channels
Solution Approach 1:
The patent changes the reference signal numerology parameter to match the MCCH numerology, ensuring that channel estimation can be successfully performed. This parameter alignment is critical for reliable decoding of the broadcast control channel, especially in single-symbol subframes where channel estimation is more challenging.
3Reliability
If dense reference signal patterns are used for single-symbol subframes, then channel estimation succeeds, but resource overhead increases
Solution Approach 1:
The patent applies local quality by using a first, denser reference signal pattern specifically for subframes with a first numerology (single-symbol subframes), while using a second, less dense pattern for subframes with a second numerology. This localized approach ensures sufficient reference signals are provided where needed (in single-symbol subframes) without unnecessarily increasing overhead in all subframes.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, a base station may indicate in system information, or a user equipment (UE) may determine based on system information, which reference signal resources may be used for channel estimation for a given broadcast control channel. In some examples, a base station may configure and transmit reference signals having the same numerology as a broadcast control channel according to a first reference signal pattern during the same subframe in which the broadcast control channel is configured. The first reference signal pattern may be more dense than a second reference signal pattern used for reference signals having a different numerology than the broadcast control channel. The more dense first reference signal pattern may provide sufficient reference signals for successful single-symbol channel estimation, resulting in a successful decoding of the broadcast control channel.