DMRS Resource Allocation for Massive MIMO Orthogonality
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Solution Overview
Problem
In massive Multiple Input Multiple Output (MIMO) mobile communication systems, existing technologies face challenges in ensuring orthogonality among Demodulation Reference Signals (DMRS) for multiple User Equipments (UEs), limiting the number of UEs that can be simultaneously served and affecting system throughput.
Innovation Solution
A method and apparatus for allocating DMRS resources that guarantee orthogonality among UEs by mapping DMRS within specific resource blocks, using symmetric resource sets on the time axis, and adjusting DMRS density based on the number of consecutive resource blocks, allowing for up to 16 orthogonal DMRS ports and supporting simultaneous transmission to multiple UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing DMRS allocation methods are used in massive MIMO systems, then the system can maintain simple resource allocation, but the number of UEs that can be simultaneously served is limited due to lack of orthogonality among DMRS
Solution Approach 1:
The patent segments DMRS resources into multiple orthogonal resource sets (first resource set and second resource set symmetric on time axis) with different densities. By dividing DMRS allocation into segmented resource blocks with specific patterns, the system can support up to 16 orthogonal DMRS ports, enabling simultaneous service to multiple UEs while maintaining manageable allocation complexity through structured segmentation.
Solution Approach 2:
The patent introduces symmetry on the time axis by creating a second resource set that is symmetric to the first resource set. This dimensional approach (using time-axis symmetry) provides additional orthogonal resources for DMRS allocation, increasing the number of simultaneously served UEs without proportionally increasing overall system complexity.
2Measurement precision
If DMRS density is increased to improve channel estimation performance, then channel estimation accuracy improves, but system throughput decreases due to increased resource overhead
Solution Approach 1:
The patent applies local quality by configuring different DMRS densities in different resource blocks based on local channel conditions. Resource blocks experiencing fading or poor channel conditions are allocated higher DMRS density for improved estimation accuracy, while resource blocks with good channel conditions use lower density to preserve throughput. This localized adaptation optimizes the balance between estimation accuracy and system throughput.
Solution Approach 2:
The patent implements dynamic DMRS density adjustment where the base station configures different DMRS densities for different resource blocks according to real-time channel state information. This dynamic configuration allows the system to adapt DMRS resources to varying channel conditions, improving channel estimation where needed while minimizing resource overhead in good conditions to maintain throughput.
3Reliability
If symmetric resource sets are used to guarantee orthogonality among DMRS, then orthogonality and reduced interference are achieved, but resource allocation flexibility is reduced
Solution Approach 1:
The patent creates universal symmetric resource sets that can serve multiple functions: guaranteeing orthogonality through symmetry while also supporting flexible UE allocation. The first and second resource sets (symmetric on time axis) provide a universal framework that works for multiple UEs with different channel conditions, maintaining orthogonality guarantees while enabling adaptable resource distribution across the symmetric resource structure.
Data Source
AI summary
A channel transmission/reception method and an apparatus for transmitting/receiving channels between a base station and a mobile terminal efficiently in a mobile communication supporting massive Multiple Input Multiple Output (MIMO) transmission are provided. The method includes determining a resource to which a Demodulation Reference Signal (DMRS) addressed to a terminal is mapped within a resource block, the DMRS resource being positioned in at least one of a first resource set capable of being allocated for DMRS and a second resource set symmetric with the first resource set on a time axis, and transmitting the DMRS and DMRS allocation information to the terminal.