DMRS Port Mapping with FD-OCC Length 4 for Orphan RB Control
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Solution Overview
Problem
Existing wireless communication technologies face challenges in increasing the number of DMRS ports beyond the limitations of Release 15, particularly in handling orphan RBs and PTRS port mapping issues due to FD-OCC length 4 and new FDM schemes in Release 18.
Innovation Solution
The proposed methods include configuring DMRS types to support up to 8 ports for single-symbol and 16 ports for double-symbol DMRS, and up to 12 and 24 ports for single- and double-symbol DMRS type 2, respectively, by using FD-OCC of length 4, FDM, and comb patterns, while addressing orphan RB issues through RB bundling and restricting scheduling, and enhancing PTRS port mapping by updating krefRE values in tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If FD-OCC length is increased to 4 in Release 18 to support more DMRS ports, then the number of DMRS ports is doubled, but orphan RBs are generated when scheduled RBs is not multiple of 2 RB
Solution Approach 1:
The patent changes the parameter of FD-OCC length from 2 to 4, which allows doubling the number of DMRS ports supported. This parameter change enables more ports to be multiplexed within the same time-frequency resources, directly addressing the need to increase DMRS port capacity while maintaining system efficiency.
Solution Approach 2:
The patent segments the RBs into pairs (bundling) to handle the FD-OCC length 4 requirement. By grouping RBs in pairs, the system can properly allocate DMRS ports without generating orphan RBs, thus resolving the contradiction between supporting more ports and maintaining scheduling simplicity.
2Quantity of substance
If FD-OCC length is increased to 4 in Release 18, then more DMRS ports are supported, but the number of REs occupied by DMRS port is decreased
Solution Approach 1:
The patent utilizes frequency domain multiplexing with FD-OCC length 4 to distribute DMRS ports across more frequency resources. By extending the OCC length in the frequency domain, the system can support more ports while maintaining adequate RE allocation through frequency spreading rather than time concentration.
3Quantity of substance
If new FDM scheme or new comb pattern is used in Release 18 to increase DMRS ports, then number of DMRS ports is doubled, but PTRS port mapping becomes complex
Solution Approach 1:
The patent performs preliminary configuration of PTRS port mapping rules before actual transmission. By pre-defining the mapping relationships between DMRS ports and PTRS ports in the configuration, the system simplifies the actual PTRS mapping process during transmission, avoiding complexity in real-time resource allocation.
Data Source
AI summary
Methods and apparatuses to facilitate larger number of DMRS ports are disclosed. A method may comprise receiving a configuration for Demodulation Reference Signal (DMRS) that includes a DMRS type, wherein, the maximum number of DMRS ports supported by DMRS type 1 is 8 for single-symbol DMRS and 16 for double-symbol DMRS, and the maximum number of DMRS ports supported by DMRS type 2 is 12 for single-symbol DMRS and 24 for double-symbol DMRS; receiving a Downlink Control Information (DCI) indicating one or more DMRS ports for a scheduled transmission, wherein the scheduled transmission is a Physical Uplink Shared Channel (PUSCH) transmission or a Physical Downlink Shared Channel (PDSCH) transmission; and mapping each of the indicated DMRS ports to a plurality of Resource Elements (REs) in one or more Resource Blocks (RBs) scheduled for the transmission based on the configuration for DMRS.