5G NR SRS Signaling With Comb 8 UE Multiplexing
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Solution Overview
Problem
Current SRS configurations in 5G NR networks are limited to comb 1, 2, or 4 transmissions, restricting the number of UEs that can be multiplexed, and require contiguous PRBs, further limiting multiplexing capabilities.
Innovation Solution
Configuring comb 8 SRS transmissions with cyclic shifts, port mapping, and resource block-level partial frequency sounding (RPFS) to allow for more flexible and efficient UE multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If comb 1, 2, or 4 SRS transmissions are used, then the configuration is simple, but the number of UEs that can be multiplexed is limited
Solution Approach 1:
The patent segments the SRS transmission resources by introducing comb 8 structure with multiple cyclic shifts (0-7) and port mappings. This divides the frequency resources into more granular units, allowing more UEs to be multiplexed simultaneously. Each UE can be assigned a unique combination of comb offset, cyclic shift, and port, effectively segmenting the overall resource pool into finer slices that accommodate more users.
Solution Approach 2:
The patent adds new dimensions to the SRS multiplexing scheme by introducing the combination of comb offset, cyclic shift, and port mapping. Instead of relying solely on frequency division, the system now utilizes multiple orthogonal dimensions (comb structure, cyclic time shifts, and spatial ports) to differentiate UEs, thereby dramatically increasing the multiplexing capacity without proportionally increasing frequency resource consumption.
2Adaptability or versatility
If contiguous PRBs are required for SRS transmission, then the resource allocation is straightforward, but the multiplexing capability is restricted
Solution Approach 1:
The patent segments the PRB resources by allowing non-contiguous PRB assignments for different UEs. Instead of requiring each UE to occupy a continuous block of PRBs, the system divides the frequency spectrum into discrete PRB units that can be selectively allocated to different UEs in a non-contiguous manner, enabling more flexible and dense multiplexing of multiple UEs within the same bandwidth.
Solution Approach 2:
The patent introduces dynamic and flexible resource allocation where the PRB assignments, comb offsets, cyclic shifts, and port mappings can be dynamically configured per UE based on channel conditions and traffic requirements. This dynamic allocation approach replaces static contiguous PRB assignments, allowing the system to adaptively optimize multiplexing efficiency and resource utilization.
3Productivity
If comb 8 SRS with multiple cyclic shifts and port mappings is implemented, then more UEs can be multiplexed, but the configuration complexity increases
Solution Approach 1:
The patent creates a universal SRS configuration framework that handles multiple UEs with different multiplexing requirements through a unified set of parameters (comb offset, cyclic shift, port mapping). This multi-functional configuration approach allows the same basic mechanism to serve multiple purposes: frequency division via comb offsets, time-domain separation via cyclic shifts, and spatial multiplexing via port mappings, thereby managing complexity through standardization.
Solution Approach 2:
The patent utilizes parameter changes to control the multiplexing behavior. By dynamically adjusting parameters such as comb offset values, cyclic shift amounts, and port mappings, the system can flexibly configure different multiplexing patterns for different UEs or different time periods. This parameter-based control allows fine-tuning of multiplexing capacity without changing the fundamental system architecture.
Data Source
AI summary
A base station is configured to determine a sounding reference signal (SRS) configuration that has a plurality of cyclic shifts for a comb 8 SRS, a plurality of user equipment (UE) ports for transmitting the comb 8 SRS and a mapping of the plurality of cyclic shifts to the plurality of UE ports. The base station is further configured to transmit the SRS configuration to the UE.