Compact Demodulation Reference Signal for 5G Reduced-Capability Devices
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Solution Overview
Problem
Existing 5G and 6G wireless networks face challenges in supporting reduced-capability user devices and mitigating interference in high-density environments, leading to demodulation faults and reduced network reliability.
Innovation Solution
The implementation of short-form pulse-amplitude demodulation references, which are low-complexity and compatible with both reduced-capability and high-performance devices, helps in noise/interference mitigation and efficient demodulation in dense wireless environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bulky DMRS configured according to complex pseudorandom sequences is used, then demodulation reference signal provides comprehensive modulation level information, but device complexity increases and reduced-capability devices struggle to process it
Solution Approach 1:
The patent extracts only the essential information needed for demodulation by using a simplified DMRS that transmits only the most significant modulation level indicators rather than comprehensive pseudorandom sequences. This extraction approach maintains demodulation accuracy while significantly reducing the processing burden on reduced-capability devices.
Solution Approach 2:
The patent segments the DMRS into shorter sequences that convey modulation level information in discrete, manageable portions. Instead of transmitting a complete complex pseudorandom sequence, the reference signal is divided into segments that provide sufficient modulation information for accurate demodulation without overwhelming low-complexity devices.
2Measurement precision
If a bulky DMRS is used in high-density wireless environments, then comprehensive modulation reference is provided, but demodulation faults increase due to fluctuating interference background
Solution Approach 1:
The patent applies partial action by transmitting only the necessary modulation level information through a shortened DMRS sequence. This partial transmission is sufficient for accurate demodulation in high-density environments while reducing the signal's vulnerability to fluctuating interference, thereby improving overall reliability.
Solution Approach 2:
The patent changes the parameters of the DMRS by reducing its length and complexity while maintaining the essential modulation level information. This parameter change allows the reference signal to be more resilient to interference in high-density wireless environments, reducing demodulation faults and improving reliability.
3Ease of operation
If reduced-capability devices use low-complexity channel without uplink grant request, then messaging complexity is reduced, but channel access control becomes more challenging
Solution Approach 1:
The patent implements self-service by allowing reduced-capability devices to autonomously access the low-complexity channel without requiring explicit uplink grants. Devices can transmit messages directly after basic contention resolution, eliminating the need for complex grant request procedures while maintaining orderly channel access through simplified contention-based mechanisms.
Data Source
AI summary
A compact demodulation reference is disclosed for compatibility with reduced-capability user devices, and for enhanced throughput for high-performance user devices of 5G and 6G in high-density environments. The demodulation reference, in some embodiments, occupies only one resource element, yet provides sufficient information to enable a receiver to calculate all of the amplitude or phase modulation levels of the modulation scheme. For example, if the modulation scheme is 16QAM, the demodulation reference can include an I branch with the highest amplitude level of the modulation scheme and an orthogonal Q branch with the lowest amplitude level. Further examples apply to a multiplexed amplitude-phase modulation scheme. In each case, the receiver can calculate the remaining amplitude (or phase) modulation levels, and thereby demodulate a proximate message. Further examples show how to reveal faulted message elements by comparing demodulation with QAM and amplitude-phase demodulation, and how to optimize noise margins.