Terminal DMRS Port Indication Table Selection
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Solution Overview
Problem
In next-generation mobile communication systems, the introduction of Rel-18 DMRS ports poses challenges in properly indicating antenna ports and switching between Rel-15 and Rel-18 DMRS ports, which can result in lower communication throughput if not adequately addressed.
Innovation Solution
A terminal equipped with a receiving section to receive downlink control information (DCI) for scheduling an uplink shared channel and a control section that selects an appropriate antenna port indication table for the DMRS port based on a specific field of the DCI, ensuring proper determination of the DMRS port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Rel-18 DMRS ports are introduced to handle more layers, then the number of orthogonal DMRS ports increases, but the complexity of indicating antenna ports and switching between Rel-15 and Rel-18 DMRS ports increases
Solution Approach 1:
The patent applies dynamics by making the antenna port indication method adaptive rather than static. The terminal dynamically selects between two indication methods based on the rank value: for rank ≤ 4, it uses the first indication method (Rel-15 style), and for rank > 4, it uses the second indication method (Rel-18 style). This dynamic adaptation allows the system to handle varying numbers of layers efficiently without requiring complex indication mechanisms for all cases.
Solution Approach 2:
The patent changes the parameter of indication method based on the rank parameter. When rank ≤ 4, the system uses one set of indication rules (first indication method), and when rank > 4, it switches to another set of indication rules (second indication method). This parameter-based switching allows the system to optimize the indication complexity according to the actual transmission requirements.
2Quantity of substance
If Rel-18 DMRS ports are introduced to handle more layers, then the number of orthogonal DMRS ports increases, but communication throughput may decrease if port indication is not properly handled
Solution Approach 1:
The patent uses dynamic adaptation to ensure that the DMRS port indication method matches the actual transmission rank. By dynamically selecting the appropriate indication method based on rank, the system avoids throughput degradation that would occur with improper port indication, while still benefiting from the increased number of orthogonal ports when needed.
Solution Approach 2:
The system changes the indication method parameter according to the rank parameter to maintain optimal throughput. When rank > 4, the second indication method is activated to properly handle the increased number of ports, ensuring that communication throughput is maintained at optimal levels.
3Reliability
If multiple antenna port indication tables are maintained for different ranks, then proper DMRS port determination is achieved, but the complexity of table selection increases
Solution Approach 1:
The patent uses the rank parameter as a simple switching criterion to select between different antenna port indication tables. This parameter-based selection mechanism maintains reliable DMRS port determination while keeping the selection process simple and straightforward.
Solution Approach 2:
The patent applies different indication table qualities locally based on the rank value. For rank ≤ 4, one type of indication table is used, and for rank > 4, another type is used. This local differentiation ensures that each rank range uses the most appropriate indication method without requiring complex global selection logic.
Data Source
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Figure 3A~3D
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives downlink control information (DCI) for scheduling an uplink shared channel, and a control section that selects an antenna port indication table related to a demodulation reference signal (DMRS) port indication for the uplink shared channel from a plurality of tables with respect to a certain rank, based on a specific field of the DCI. According to one aspect of the present disclosure, a DMRS port can be properly determined.