SRS Transmission Time Calculation for LTE Frequency Hopping
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Solution Overview
Problem
In the LTE system, SRS transmission times are discontinuous when the SRS period is 2ms, leading to ineffective frequency hopping performance due to lack of continuous increment in transmission times.
Innovation Solution
Calculating reference variables based on the number of transition points, system frame number, time slot number, and sub-frame offset, and summing these variables to determine continuous SRS transmission times, ensuring UEs with the same SRS period have synchronized and increasing transmission times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the SRS period is set to 2ms with conventional transmission time calculation, then the SRS transmission frequency is increased, but the transmission times become discontinuous leading to ineffective frequency hopping performance
Solution Approach 1:
The patent modifies the transmission time calculation parameters by introducing a new formula that incorporates the number of downlink-to-uplink transition points (N_SP) in a wireless frame. The calculation changes from using only system frame number and sub-frame offset to including transition point information, thereby transforming the discontinuous transmission times into continuous ones while maintaining the 2ms SRS period for high transmission frequency
Solution Approach 2:
The patent segments the transmission time calculation into multiple reference variables: first reference variable based on transition points and system frame number, second reference variable based on transition points and time slot number, and third reference variable based on sub-frame offset. This segmentation allows each variable to contribute specifically to ensuring continuous increment while maintaining the desired transmission frequency
2Device complexity
If the transmission time calculation uses conventional formula with system frame number and sub-frame offset, then the calculation is simple, but the transmission times are discontinuous when SRS period is 2ms
Solution Approach 1:
The patent adds transition point information (N_SP) as a new parameter to the transmission time calculation, transforming the calculation from a simple two-component formula to a more comprehensive three-component formula. This parameter addition ensures continuous transmission times while keeping the calculation method systematic and manageable through clear variable definitions
3Adaptability or versatility
If frequency hopping is implemented based on conventional SRS transmission times, then the frequency hopping mechanism is established, but the hopping performance deteriorates due to discontinuous transmission times
Solution Approach 1:
The patent modifies the frequency hopping mechanism by changing the transmission time parameter calculation to ensure continuous increment. This parameter change allows the frequency hopping to function effectively by providing properly sequential transmission time values that enable reliable frequency transitions across different SRS resources
Data Source
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AI summary
The method for controlling signal transmission comprises: determining the first reference variable according to the number of transition points from downlink to uplink in a wireless frame of the system and the system frame number (S502); determining the second reference variable according to the number of transition points from downlink to uplink in a wireless frame and the time slot number (S504); determining the third reference variable according to the sub-frame offset of the signal (S506); and determining signal transmission times according to the first reference variable, the second reference variable and the third reference variable, so as to control the signal transmission (S508). In virtue of the technical solution of the present invention, by calculating the corresponding reference variables according to related parameters and treating the sum of the corresponding reference variables as the transmission times, the continuous SRS transmission times can be calculated, and the aim can be achieved that the UEs with the same SRS period have the same SRS transmission times at the same time, and the transmission times increase continuously for the UE, thereby the perfect frequency hopping performance can be obtained.