Sounding Reference Signal Antenna Selection for Three Groups
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Solution Overview
Problem
Existing LTE protocols cannot support SRS antenna selection for three antenna groups, limiting the ability of terminal devices to obtain complete channel information efficiently.
Innovation Solution
A sounding reference signal transmission method that allows terminal devices to select and send SRS through multiple antenna groups using specific sequence-based formulas, ensuring each group is used equally over time, thereby supporting antenna selection for three antenna groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing LTE protocol with 1T2R antenna selection formula is used, then the terminal device can perform antenna selection for two antenna groups, but it cannot support antenna selection for three antenna groups, limiting channel information completeness
Solution Approach 1:
The patent extends the antenna selection capability by changing the parameter of antenna group quantity from 2 to 3. It introduces a new selection formula that incorporates three antenna groups, allowing the terminal device to select from three antenna groups based on SRS transmission requirements, thereby improving adaptability while maintaining channel information completeness
Solution Approach 2:
The patent creates a universal antenna selection mechanism that can handle both 2 antenna group and 3 antenna group scenarios. The extended formula structure allows flexible configuration for different numbers of antenna groups, making the system multi-functional and adaptable to various deployment scenarios without losing channel information
2Measurement precision
If the terminal device transmits SRS on multiple antenna groups simultaneously, then complete channel information can be obtained, but the device complexity and transmission resource requirements increase
Solution Approach 1:
The patent implements periodic antenna group transmission where the terminal device transmits SRS on different antenna groups in a periodic manner over multiple transmission occasions. This allows the network device to collect channel information from all three antenna groups over time without requiring simultaneous transmission, thereby maintaining measurement precision while reducing device complexity
Solution Approach 2:
The patent segments the channel measurement process into multiple transmission occasions, with each occasion dedicated to a specific antenna group. This segmentation allows the terminal device to sequentially transmit SRS on different antenna groups, simplifying the transmission process while ensuring complete channel information is collected across all groups
Data Source
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AI summary
This application provides a sounding reference signal transmission method, including: selecting, by a terminal device based on a sequence number nSRS of a quantity of transmissions of a sounding reference signal SRS and a quantity Λ of antenna groups, an antenna group whose sequence number is a(nSRS) from the Λ antenna groups, so that in a process of sending the SRS for 2Λ times, the SRS is sent through each of the Λ antenna groups at least once, where nSRS is an integer greater than or equal to 0, and Λ is a positive integer greater than or equal to 3; and sending, by the terminal device during the nSRSth SRS transmission, the SRS through antenna ports included in the antenna group whose sequence number is a(nSRS). The technical solutions provided in this application can implement SRS antenna selection for three antenna groups. The method provided in the embodiments may be applied to a communications system such as a V2X communications system, an LTE-V communications system, a V2V communications system, an internet of vehicles communications system, an MTC communications system, an IoT communications system, an LTE-M communications system, an M2M communications system, or an internet of things communications system.