Mixed Numerology Co-Channel Coexistence via Paired Slot Redundancy
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Solution Overview
Problem
Wireless communication systems face challenges in co-channel coexistence between different radio access technologies (RATs) with varying numerologies, leading to interference and decoding errors due to gain fluctuations during automatic gain control (AGC) operations.
Innovation Solution
Transmitting different redundancy versions (RVs) of a transport block (TB) in paired slots with varying subcarrier spacings to maintain consistent gain levels across RATs, using paired slots to overlap with subframes of other RATs, and employing different modulation and coding schemes as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmissions are performed in paired slots with different numerologies, then spectral efficiency is improved, but AGC accuracy deteriorates due to gain fluctuations
Solution Approach 1:
The transmission is divided into multiple slots with different numerologies (e.g., first slot with first SCS, second slot with second SCS). Each slot is independently configured with appropriate numerology to maintain AGC accuracy while collectively achieving high spectral efficiency through flexible resource utilization.
Solution Approach 2:
The subcarrier spacing parameter is changed between different slots (first SCS in first slot, second SCS in second slot). This parameter change allows the system to adapt to different numerology requirements while maintaining AGC accuracy through proper configuration of each slot's parameters.
2Reliability
If different redundancy versions are transmitted in consecutive slots, then decoding reliability is improved, but system complexity increases
Solution Approach 1:
Different redundancy versions are transmitted in consecutive slots based on feedback information. The receiver provides feedback about the received signal quality and decoding status, which guides the transmitter in selecting appropriate redundancy versions for subsequent slots, thereby improving decoding reliability through adaptive retransmission.
Solution Approach 2:
Redundancy versions are transmitted periodically in consecutive slots according to a predefined pattern or feedback-driven schedule. This periodic transmission of different RVs ensures that the receiver receives sufficient redundancy information for reliable decoding while maintaining manageable system complexity through structured transmission timing.
3Adaptability or versatility
If paired slots are used to overlap with other RAT subframes, then co-channel coexistence is improved, but interference increases
Solution Approach 1:
Different parts of the transmission (different slots) are configured with different qualities or characteristics. The first slot uses first SCS optimized for certain RATs while the second slot uses second SCS optimized for other RATs, allowing local optimization for coexistence while managing interference through differentiated transmission characteristics.
Solution Approach 2:
The transmission system dynamically adapts its numerology configuration based on the operational context and coexistence requirements. By dynamically switching between different SCS values in different slots, the system can respond to changing interference conditions and optimize co-channel coexistence performance in real-time.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A wireless communication device may transmit, in a radio frequency (RF) spectrum band that supports co-channel coexistence between a first radio access technology (RAT) associated with a first subcarrier spacing (SCS) and a second RAT associated with a second SCS, during a first slot of two or more consecutive slots of a paired transmission, a first redundancy version (RV) of a transport block (TB) that includes a first set of parity bits and a first set of information bits associated with the TB. The wireless communication device may transmit, in the RF spectrum band, during a second slot of the two or more consecutive slots of the paired transmission, a second RV of the TB that includes a second set of parity bits and a second set of information bits associated with the TB.