DMRS Randomization for 5G Wearable IoT Collision Reduction
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Solution Overview
Problem
Existing wireless systems face challenges in handling multiple wearable IoT devices due to issues such as simultaneous access, short/sparse data transmissions, and potential collisions, which strain network resources and lead to power consumption and resource waste.
Innovation Solution
The implementation of a subframe structure with Demodulation Reference Signals (DMRS) that randomizes DMRS locations and patterns to minimize inter-PAN collisions, using pseudo-random or Zadoff-Chu sequences for channel estimation and modulation, and power boosting of DMRS signals to enhance channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If DMRS locations are fixed and standardized, then device complexity is reduced and ease of manufacture is improved, but inter-PAN collisions increase and communication reliability deteriorates
Solution Approach 1:
The patent applies dynamics by making DMRS locations variable rather than fixed. The system dynamically selects DMRS locations from multiple candidate positions based on device identity, network conditions, and resource allocation. This dynamic approach prevents persistent collisions in high-density scenarios while maintaining standardized procedures for location selection, thus resolving the contradiction between ease of implementation and communication reliability.
Solution Approach 2:
The patent changes the parameter of DMRS location positions from fixed to variable. By introducing multiple candidate locations and selecting among them based on device-specific parameters (such as device ID, PAN ID, or resource block allocation), the system transforms a static reference signal design into a flexible one. This parameter change enables the system to adapt to high-density scenarios and reduce collisions while maintaining implementation simplicity through standardized selection procedures.
2Adaptability or versatility
If network resources are allocated to support multiple wearable devices, then device connectivity and functionality are improved, but power consumption and resource waste increase
Solution Approach 1:
The patent applies partial action by allocating network resources and transmitting DMRS signals only when and where needed. Instead of continuous resource allocation, the system activates DMRS transmission selectively based on device activity, channel conditions, and collision risk assessment. This partial action approach enables support for multiple wearable devices while minimizing unnecessary power consumption and resource waste during idle or low-traffic periods.
3Measurement precision
If DMRS transmission power is increased, then channel estimation accuracy is improved, but interference to other PANs increases
Solution Approach 1:
The patent applies local quality by making DMRS transmission power location-dependent rather than uniform. The system adjusts transmission power based on the specific resource unit, device identity, and local interference conditions. This localized power adjustment enables accurate channel estimation for each device while minimizing interference to other PANs by reducing power in locations where collision risk is low or where other devices are not present.
Data Source
AI summary
Systems and methods of providing DMRS for a UE are generally described. The DMRS locations in a resource unit of a Physical Resource Allocation of a shared channel are randomly determined, and the DMRS sequences randomly generated before transmission from a master UE to a wearable UE. The DMRS locations are disposed on different subcarriers and symbols in the resource unit and are repeated every k subframes or m resource units within the same subframe. In situations in which the collision/contention probability is relatively small, DMRS in control channels may be used rather than in the shared data channel.