SRS Frequency Hopping for Partial Band Sounding Coverage
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Solution Overview
Problem
The existing SRS design in Rel-15 and Rel-16 wireless communication systems is deficient in terms of frequency hopping, leading to inefficiencies and interference, particularly in unlicensed NR and NR positioning, where SRS transmission is not optimized for partial frequency sounding.
Innovation Solution
Implementing frequency hopping enhancement for RB-level partial frequency sounding by introducing a location hopping parameter for SRS transmission occasions, allowing UEs to perform partial sounding across multiple repetitions, thereby ensuring effective coverage of the entire frequency range and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS transmission uses fixed frequency allocation without hopping, then device complexity is reduced, but frequency range coverage is insufficient and interference increases
Solution Approach 1:
The patent implements frequency hopping by dynamically changing the frequency location of SRS transmission across multiple transmission occasions. The starting location for each SRS transmission is determined by a formula that incorporates a hopping parameter, allowing the frequency position to vary systematically over time. This dynamic frequency allocation enables comprehensive coverage of the entire frequency range while maintaining manageable complexity through mathematical determination of hop positions.
Solution Approach 2:
The patent employs periodic frequency hopping where SRS transmissions occur at regular intervals with systematic frequency changes. The hopping pattern follows a periodic structure defined by transmission occasions and configured parameters, allowing the system to cycle through different frequency positions in a predictable manner. This periodic approach ensures complete frequency range coverage over time while maintaining synchronization between base station and user equipment.
2Productivity
If multiple UEs transmit SRS in the same subband simultaneously, then resource utilization is improved, but interference between UEs increases
Solution Approach 1:
The patent applies frequency hopping to dynamically allocate different frequency positions to multiple UEs across transmission occasions. Instead of static subband assignment, each UE's SRS transmission frequency location changes over time according to the hopping mechanism. This dynamic allocation allows multiple UEs to share the same time resources while experiencing reduced interference through frequency diversity, as they occupy different frequency positions at different occasions.
Solution Approach 2:
The patent changes the frequency domain parameter of SRS transmission by introducing hopping parameters that systematically vary the starting location across transmission occasions. This parameter change approach allows the system to maintain high resource utilization by reusing time and code resources while reducing interference through frequency domain separation that varies over time. The hopping parameter configuration enables flexible control of frequency allocation patterns.
Data Source
AI summary
Provided is a method for a base station, includes: generating, for transmission to at least one UE, control information associated with SRS transmission, wherein the control information indicates an SRS band including a plurality of RBs for the SRS transmission, the control information indicates a first subband for a first UE and a second subband for a second UE in a same SRS band for an SRS transmission occasion; receiving, from the at least one UE, SRS on a plurality of SRS transmission occasions according to the control information, wherein a location hopping parameter is applied to the plurality of SRS transmission occasions, wherein a first starting location of the first subband for the first UE on a first SRS transmission occasion and a second starting location of the first subband for the first UE on a second SRS transmission occasion are determined based on the location hopping parameter.