SRS Port Mapping Across OFDM Symbols for High Uplink Layers
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively supporting a high quantity of transmission layers, such as eight layers, due to inadequate techniques for mapping sounding reference signal (SRS) ports to combs and OFDM symbols, leading to failed procedures, increased latency, and inefficient resource use.
Innovation Solution
The UE is configured with SRS port mapping information across multiple symbols, allowing it to split SRS ports into subsets and calculate cyclic shifts based on configuration parameters, enabling the mapping of SRS ports to multiple OFDM symbols, thereby supporting high transmission layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS ports are mapped to a single OFDM symbol using conventional techniques, then the mapping procedure is simple, but the system cannot support a high quantity of transmission layers (e.g., eight layers) and experiences failed procedures and increased latency
Solution Approach 1:
The patent segments SRS ports into multiple subsets, where each subset is mapped to a different OFDM symbol. Specifically, first SRS ports are mapped to a first OFDM symbol while second SRS ports are mapped to a second OFDM symbol. This segmentation enables the system to support a higher quantity of transmission layers by distributing the port mapping across multiple symbols, thereby resolving the contradiction between supporting more layers and maintaining mapping simplicity.
Solution Approach 2:
The patent extends the SRS port mapping from a single-dimensional approach (one symbol) to a multi-dimensional approach (multiple symbols). By mapping different SRS port subsets to different OFDM symbols in the time domain, the system gains additional dimensional space to accommodate more transmission layers, thus improving adaptability while managing complexity through structured multi-symbol mapping.
2Productivity
If SRS ports are mapped across multiple OFDM symbols, then the system can support high transmission layers, but the mapping procedure complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the mapping relationships between SRS port subsets and OFDM symbols before actual transmission. The network entity determines and signals the mapping configuration in advance, allowing the UE to prepare the mapping without real-time computation delays. This reduces the time loss associated with complex multi-symbol mapping while enabling high transmission layer productivity.
3Ease of manufacture
If conventional SRS port mapping techniques are used, then the implementation is straightforward, but resource use becomes inefficient when supporting high transmission layers
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the SRS port mapping configuration to be adjusted based on the number of transmission layers and available OFDM symbols. The mapping scheme dynamically allocates port subsets to symbols, optimizing resource utilization for high transmission layer scenarios while maintaining implementation simplicity through standardized configuration procedures signaled by the network entity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a network entity, control signaling that includes sounding reference signal (SRS) configuration information associated with an increased quantity of SRS ports. The SRS configuration information may include a quantity of symbols via which to transmit SRSs, a frequency resource comb for each respective symbol, and a threshold quantity of cyclic shifts. The UE may map a first subset of SRS ports to a first symbol and map a second subset of SRS ports to a second symbol. The UE may transmit, and the network entity receive, the SRSs using the first subset of SRS ports via the first symbol according to a first frequency resource comb and respective cyclic shifts and using the second subset of SRS ports via the second symbol according to a second frequency resource comb and respective cyclic shifts.