Terminal Control of PTRS-DMRS Association in Multi-Layer PUSCH
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Solution Overview
Problem
Existing radio communication systems face challenges in controlling the correspondence relation between antenna ports for uplink phase tracking reference signals and demodulation reference signals when supporting more than four layers, leading to potential throughput reduction and communication quality degradation.
Innovation Solution
A terminal and base station are designed to receive downlink control information that indicates the association between uplink phase tracking reference signals and demodulation reference signals, with a field size change or combination of fields to manage the association when the number of layers or antenna ports exceeds a certain number, enabling appropriate uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of layers or antenna ports for PUSCH is extended beyond four, then the uplink transmission capacity is improved, but the control of correspondence relation between PTRS and DMRS antenna ports becomes complex and may cause throughput reduction or communication quality degradation
Solution Approach 1:
The patent segments the control of antenna port correspondence by introducing separate indication mechanisms for different scenarios. When the number of layers exceeds four, the system divides the control into: (1) indication of the number of PTRS antenna ports, and (2) indication of the correspondence relation between PTRS and DMRS antenna ports. This segmentation allows independent optimization of each control aspect, reducing overall complexity while supporting extended uplink capacity.
Solution Approach 2:
The patent implements dynamic control of the correspondence relation between PTRS and DMRS antenna ports based on the actual number of layers. The correspondence is not fixed but adaptively determined according to the layer configuration. This dynamic approach allows the system to efficiently handle varying numbers of layers (beyond the traditional four) without requiring complex static control mechanisms for all possible scenarios.
2Productivity
If the number of layers or antenna ports for PUSCH is extended beyond four, then the uplink transmission capacity is improved, but communication quality may degrade due to improper correspondence control
Solution Approach 1:
The patent incorporates feedback mechanisms where the base station receives uplink transmission data and provides control information back to the terminal regarding the correspondence relation between PTRS and DMRS antenna ports. This feedback loop allows the system to adjust and optimize the correspondence relation based on actual transmission conditions, ensuring communication quality is maintained even when the number of layers exceeds four.
Solution Approach 2:
The patent changes key parameters of the control mechanism: (1) the number of bits used to indicate the correspondence relation is adapted based on the number of layers, and (2) the correspondence relation itself is dynamically adjusted. These parameter changes enable the system to maintain optimal communication quality across different layer configurations, preventing degradation when extending beyond four layers.
3Productivity
If the number of layers or antenna ports for PUSCH is extended beyond four, then the uplink transmission capacity is improved, but the control information overhead increases
Solution Approach 1:
The patent makes the downlink control information field serve multiple functions: it simultaneously indicates (1) the number of PTRS antenna ports and (2) the correspondence relation between PTRS and DMRS antenna ports. This multi-functionality reduces the need for separate dedicated control fields, thereby limiting the increase in control information overhead while still providing the necessary control capabilities for extended layer configurations.
Solution Approach 2:
The patent dynamically changes the size or interpretation of control fields based on the number of layers. When layers exceed four, the control information structure is adapted to efficiently encode both the number of PTRS ports and their correspondence to DMRS ports within a unified field, optimizing the information overhead for the extended scenario rather than using fixed-size fields for all cases.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3C
AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives downlink control information including a field indicating association between an uplink phase tracking reference signal (PTRS) and a demodulation reference signal (DMRS) for an uplink shared channel (PUSCH); and a control section that judges, based on the field, the association between the PTRS and the DMRS, wherein a size of the field is changed or a combination of the field and other information indicates the association between the PTRS and the DMRS, when the number of ranks or the number of layers for the PUSCH is larger than a certain number.