Terminal SRS Resource Selection for Full Power Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In next-generation mobile communication systems, such as 5G NR, the use of codebook-based transmission with multiple ports results in reduced transmission power, leading to decreased coverage and suppressed communication throughput due to the limitations of Power Amplifiers (PAs) not being able to output maximum rated power.
Innovation Solution
A terminal is configured to receive Sounding Reference Signal (SRS) resource configuration information and determine an appropriate SRS resource for full power transmission by utilizing an SRS Resource Index (SRI) field in downlink control information, allowing for dynamic selection of SRS resources with different numbers of ports to ensure maximum power amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If codebook-based transmission with multiple ports is used, then spatial diversity gains and communication throughput are improved, but transmission power decreases due to Power Amplifier limitations
Solution Approach 1:
The patent applies dynamics by making the SRS resource configuration adaptable and changeable. The base station dynamically configures different SRS resource set configurations with varying numbers of ports based on UE capability information. The UE can switch between different SRS resources (full-rated PA resources vs. non-full-rated PA resources) depending on the transmission requirements, allowing the system to optimize between power output and spatial diversity on demand rather than being fixed
2Power
If multiple SRS resources with different numbers of ports are configured, then full power transmission can be controlled, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the SRS resources into distinct groups based on PA capability. SRS resource sets are segmented into those associated with full-rated PAs and those associated with non-full-rated PAs. Each SRS resource within a set has a specific number of ports configured according to its PA type. This segmentation allows the UE to select appropriate resources without having to manage a single complex unified configuration
Solution Approach 2:
The patent applies preliminary action by pre-configuring SRS resource sets with specific port configurations before transmission occurs. The base station provides RRC signaling that defines multiple SRS resource sets in advance, each with predetermined numbers of ports corresponding to different PA capabilities. The UE stores these pre-configured resources and can quickly select from them during transmission based on the DCI indication, avoiding real-time complex decision-making
3Ease of manufacture
If non-full-rated PAs are used in multi-port transmission, then device cost is reduced, but coverage decreases due to lower transmission power
Solution Approach 1:
The system dynamically adapts the transmission configuration based on coverage requirements. When full coverage is needed, the UE can be instructed to use SRS resources configured for full-rated PAs with appropriate port numbers. When cost reduction is acceptable and coverage requirements are met with non-full-rated PAs, the system can utilize those configurations. This dynamic adaptation allows the system to balance cost and coverage based on actual operational needs
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives configuration information of a Sounding Reference Signal (SRS) resource set including three or more SRS resources having different numbers of SRS ports; and a control section that determines one SRS resource from the three or more SRS resources based on an SRS Resource Index (SRI) field included in downlink control information and having a same size as a size of an SRI field of 3GPP Release 15 New Radio. According to one aspect of the present disclosure, it is possible to appropriately control full power transmission.