SRS Frequency Hopping for Distributed Antenna Port Mapping
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Solution Overview
Problem
In wireless communication systems, SRS transmissions with distributed antenna port mapping are less robust due to frequency hopping on a per-symbol basis, impacting uplink channel estimation, scheduling, link adaptation, and beam management.
Innovation Solution
Implementing a frequency hopping pattern for SRS transmissions that treats multiple OFDM symbols as a single unit, allowing all antenna ports to be sounded in each frequency hop, thereby enhancing time and frequency domain diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency hopping is applied on a per-symbol basis for distributed antenna port mapping, then the system can support distributed mapping of antenna ports across multiple OFDM symbols, but the robustness of SRS transmissions deteriorates and uplink channel estimation becomes less accurate
Solution Approach 1:
The patent merges multiple OFDM symbols into a single frequency hop unit, treating them as one cohesive entity rather than processing them individually. This combining approach ensures that all antenna ports mapped across multiple symbols participate in a single frequency hop event, maintaining frequency diversity while supporting distributed antenna port mapping. The frequency hopping pattern is applied at the symbol-level aggregation rather than per-symbol basis, resolving the contradiction between adaptability for distributed mapping and reliability for robust transmissions.
2Adaptability or versatility
If frequency hopping is applied on a per-symbol basis, then distributed antenna port mapping is enabled, but time and frequency domain diversity is reduced impacting channel estimation
Solution Approach 1:
The patent introduces a new dimension for frequency hopping by operating at the aggregated symbol level rather than the individual symbol level. This dimensional change in the hopping granularity allows the system to maintain both the flexibility of distributed antenna port mapping across multiple symbols and the diversity needed for accurate channel estimation. By treating multiple symbols as a single unit for frequency hopping purposes, the system achieves diversity in the time domain while maintaining frequency hopping benefits.
3Reliability
If frequency hopping pattern treats multiple OFDM symbols as a single unit, then all antenna ports are sounded in each frequency hop enhancing diversity, but the complexity of determining the hopping pattern increases
Solution Approach 1:
The patent applies preliminary action by pre-determining the frequency hopping pattern based on the aggregated set of OFDM symbols before actual transmission occurs. The hopping pattern is established in advance using the total count of symbols in the aggregated set, allowing the system to prepare the frequency allocation strategy beforehand. This preliminary determination simplifies the actual transmission process while ensuring all antenna ports are sounded in each frequency hop, achieving robustness without excessive complexity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information indicating a sounding reference signal (SRS) resource set that includes an SRS resource, the SRS resource associated with multiple antenna ports having a distributed mapping to multiple orthogonal frequency division multiplexing (OFDM) symbols of the SRS resource. The UE may transmit a plurality of SRSs on the multiple antenna ports in the multiple OFDM symbols of the SRS resource using a frequency hopping pattern that is a function of a count of a quantity of SRS transmissions, and the count of the quantity of SRS transmissions is scaled by a quantity of the multiple OFDM symbols. Numerous other aspects are described.