DMRS Port Mapping for 5G Downlink Scheduling
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Solution Overview
Problem
Current 5G NR technology faces limitations in efficiently managing increased orthogonal DMRS ports and PRB bundling sizes, leading to reduced spectral efficiency and increased signaling overhead, which affects downlink performance.
Innovation Solution
The proposed solution involves configuring a DMRS port mapping configuration with orthogonal codes of length N>2 in the frequency domain and transmitting an indication of DMRS port identifiers, along with configuring PRB bundling sizes of sub-RB, 1 RB, or 8 RBs, to optimize DMRS port usage and reduce overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If orthogonal codes of length N>2 are used in frequency domain for DMRS port mapping, then the number of supported downlink layers increases, but signaling overhead increases
Solution Approach 1:
The patent implements dynamic indication of DMRS port identifiers through DCI format 1_1, where the antenna port field dynamically indicates the DMRS port based on the configured orthogonal code length. This allows the system to adapt the signaling overhead to the actual number of downlink layers being transmitted, rather than always using the maximum possible overhead.
Solution Approach 2:
The patent changes the parameter of orthogonal code length (N) in the frequency domain, where N can be 2 or 4. By configuring different code lengths, the system can support different numbers of downlink layers (up to 4 layers when N=2, up to 8 layers when N=4) while managing the signaling overhead appropriately for each configuration.
2Productivity
If PRB bundling size is increased to improve downlink performance, then spectral efficiency improves, but system complexity increases
Solution Approach 1:
The patent enables dynamic configuration of PRB bundling sizes through RRC signaling, allowing the network to adjust the bundling size (e.g., 2 RBs, 4 RBs, or 8 RBs) based on channel conditions and traffic requirements. This dynamic approach allows the system to achieve high spectral efficiency when needed while maintaining flexibility to reduce complexity when conditions permit.
Solution Approach 2:
The patent changes the PRB bundling size parameter to optimize downlink performance. By configuring different bundling sizes, the system can adapt to varying channel conditions, achieving better spectral efficiency with larger bundling sizes when channel conditions are favorable, while using smaller bundling sizes when more flexibility is needed.
Data Source
AI summary
Method and apparatus for downlink scheduling for increased orthogonal DMRS ports and PRB bundling size. The apparatus transmits DCI comprising an antenna value associated with a DMRS port mapping configuration. The DMRS port mapping configuration comprising orthogonal codes over a frequency domain and an orthogonal code sequence having a length (N) of orthogonal codes applied in the frequency domain. The orthogonal code sequence having a value of N>2. The apparatus transmits an indication comprising a DMRS port ID field associated with the DMRS port mapping configuration. At least one of the DMRS port ID field, the orthogonal code sequence, or the antenna value configured to identify a DMRS port.