DMRS Port Mapping for High-Dimensional MIMO Resource Allocation
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Solution Overview
Problem
High-dimensional MIMO systems face challenges in supporting data transmission beyond eight streams due to limitations in existing DMRS designs, which restrict throughput and capacity, especially with high-order SU-HD-MIMO communications.
Innovation Solution
A resource allocation method that maps DMRS ports onto different CDM groups, allowing for orthogonal DMRS design for up to 24 data streams by setting port grouping, thereby enabling concurrent transmission and effective demodulation in systems with a large number of antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing DMRS design with maximum 8 layers is used, then system compatibility and standard support are maintained, but data transmission capacity and throughput are limited
Solution Approach 1:
The patent segments DMRS ports into multiple CDM groups (first CDM group and second CDM group) to support up to 24 layers. By dividing the port space into distinct groups with different mapping patterns, the system can accommodate high-dimensional MIMO while maintaining manageable complexity through structured organization of reference signals.
Solution Approach 2:
The patent extends the DMRS port mapping from the traditional 8-layer limit to 24 layers by utilizing additional CDM groups. This dimensional extension allows more data streams to be multiplexed on the same resource blocks by introducing new port indexing schemes and CDM group configurations, effectively increasing the system's capacity dimension.
2Adaptability or versatility
If DMRS signals are multiplexed at maximum 8 layers on a resource block, then orthogonal DMRS design is maintained, but support for high-dimensional MIMO and high-rank transmission is insufficient
Solution Approach 1:
The patent creates a universal DMRS port mapping framework that can accommodate both traditional 8-layer systems and new 24-layer high-dimensional MIMO systems. The same resource blocks and basic CDM principles are reused, but extended with additional port indexing rules and CDM group configurations to support higher layer counts, achieving multi-functionality across different MIMO dimensions.
Solution Approach 2:
The patent changes key parameters including the maximum layer count from 8 to 24, introduces new CDM group indices (0, 1, 2, 3), and modifies port indexing formulas to support extended layer ranges. These parameter changes enable the system to adapt to high-dimensional MIMO while maintaining backward compatibility through conditional mapping rules.
3Productivity
If antenna scale is increased beyond 8T8R, then system capacity and spectral efficiency are improved, but DMRS overhead and resource requirements increase
Solution Approach 1:
The patent merges multiple DMRS ports into shared CDM groups, allowing up to 24 ports to be multiplexed within the same resource block structure. By combining ports into groups that share time-frequency resources through code division, the system reduces per-port overhead while supporting higher capacity, as multiple layers share the same pilot resources through orthogonal codes.
Data Source
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AI summary
Embodiments of the present invention provide a resource allocation method and apparatus, and relate to the communications field. On the premise of existing DMRS pilot overheads, an orthogonal DMRS design method for up to 24 data streams is implemented by means of new port mapping. The solution includes: determining, according to network configuration information, that a quantity of demodulation reference signal DMRS layers of a base station is N; and if 8<N≤12, mapping N DMRS ports corresponding to the quantity of DMRS layers onto three CDM groups on a resource block RB; if 12<N≤24, mapping N DMRS ports corresponding to the quantity of DMRS layers onto six CDM groups on an RB; or if N≤8, mapping N DMRS ports corresponding to the quantity of DMRS layers onto two CDM groups on an RB.