PUSCH Uplink Scheduling with Segmented SRI Fields for 8 Layers
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Solution Overview
Problem
The increase in the maximum number of ports/layers for PUSCH transmission to 8 requires an increase in the size of the SRI field, leading to an increased DCI payload overhead.
Innovation Solution
Configuring two SRS resource sets for codebook or non-codebook usage, with a transmission scheme based on antenna ports determined by SRS ports from multiple SRS resource sets, using existing DCI fields to support up to 8 layers without increasing the DCI payload size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the maximum number of ports/layers for PUSCH transmission is increased to 8, then the transmission capacity is improved, but the size of the SRI field must be increased by up to two times
Solution Approach 1:
The patent divides the SRI field indication into two separate fields: a first SRI field for indicating first SRS resources and a second SRI field for indicating second SRS resources. This segmentation allows the system to support up to 8 ports/layers by combining indications from both fields without requiring a single oversized SRI field, thus resolving the contradiction between transmission capacity and field size complexity
Solution Approach 2:
The patent introduces a new dimension by configuring two distinct SRS resource sets (first and second SRS resource sets) with different usage types (codebook and non-codebook). This dimensional expansion enables the system to represent up to 8 ports/layers through combinations of resources from both sets, indicated via the two SRI fields, thereby achieving higher transmission capacity without proportionally increasing the complexity of individual fields
2Productivity
If the size of the SRI field is increased to support up to 8 ports, then the PUSCH transmission capability is improved, but the overhead of the DCI payload increases
Solution Approach 1:
The patent segments the SRI field into two separate fields (first SRI field and second SRI field), each managing a specific subset of SRS resources. This segmentation strategy allows the system to support up to 8 ports/layers while distributing the overhead across multiple smaller fields rather than one large field, thereby reducing the total DCI payload overhead compared to a single oversized SRI field
Solution Approach 2:
The patent makes the DCI structure more universal by enabling the same two SRI fields to serve multiple purposes: they can indicate combinations of SRS resources for up to 8 ports/layers, while also maintaining compatibility with existing 4-layer configurations. This multi-functionality allows the system to achieve enhanced transmission capability without proportionally increasing payload overhead
Data Source
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AI summary
A method according to one embodiment of the present specification comprises the steps of: receiving configuration information related to an SRS; receiving configuration information related to a PUSCH; receiving DCI for PUSCH scheduling; and transmitting the PUSCH on the basis of the DCI. The number of layers related to the PUSCH is greater than 4. The PUSCH is transmitted on the basis of antenna ports. The antenna ports are determined on the basis of i) at least one from among eight first-SRS-ports related to a first SRS resource set, and/or ii) at least one from among eight second-SRS-ports related to a second SRS resource set.