Terminal SRS Spatial Relation Switching via MAC CE
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Solution Overview
Problem
In future radio communication systems like NR, the dynamic change of spatial relations for Sounding Reference Signals (SRS) is required but not supported in Rel-15 NR, limiting the flexibility of uplink channel and signal transmission processing.
Innovation Solution
The proposed solution involves configuring spatial relations for SRS resources using RRC signaling and MAC CE to allow dynamic changes, enabling flexible control of uplink beams and signals through MAC CE-activated spatial relations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If spatial relation configuration for SRS resources is fixed in Rel-15 NR, then system simplicity is maintained, but dynamic adaptability for uplink transmission is limited
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed spatial relation configuration to a dynamic configuration where spatial relations can be changed. This is achieved by introducing a mechanism to update spatial relation information for SRS resources, allowing the system to adapt to changing transmission requirements while maintaining a manageable configuration structure.
Solution Approach 2:
The patent changes the parameter of spatial relation configuration from static to dynamic. By enabling updates to spatial relation information through standardized procedures, the system can modify transmission parameters without requiring complete reconfiguration, thus improving adaptability while controlling complexity.
2Adaptability or versatility
If dynamic spatial relation changes are implemented for SRS, then transmission flexibility is improved, but configuration complexity increases
Solution Approach 1:
The patent segments the spatial relation configuration into manageable components. By dividing the configuration into distinct elements that can be independently updated, the system achieves transmission flexibility while reducing the complexity of managing overall configuration changes through standardized update procedures.
3Adaptability or versatility
If one-to-one association between SRS resources and spatial relations is maintained, then configuration simplicity is preserved, but dynamic reconfiguration capability is reduced
Solution Approach 1:
The patent introduces dynamics to the one-to-one association model by enabling updates to spatial relation information. This allows the system to maintain the simplicity of one-to-one mapping while achieving dynamic reconfiguration capability through standardized update procedures that modify existing associations rather than creating complex many-to-many relationships.
Data Source
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AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a Medium Access Control (MAC) control element for activating spatial relation information (SRI) related to a Sounding Reference Signal (SRS) resource set, and a control section that applies the SRI indicated by the MAC control element to a plurality of SRS resources in the SRS resource set, when the SRS resource set corresponds to a specific usage. According to one aspect of the present disclosure, a spatial relation for an SRS can be appropriately specified.