LTE Subframe SRS Symbol Configuration for Channel Measurement
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Solution Overview
Problem
The existing LTE system faces challenges in satisfying the increasing channel measurement requirements due to the high capacity demands and rapid channel changes, particularly with the introduction of multiple-antenna technologies and increased user speeds, leading to a need for enhanced channel measurement capabilities.
Innovation Solution
A subframe configuration method that includes configuring a target subframe with multiple SRS symbols and sending specific signaling to terminal devices to allocate and manage SRS resources, including time, frequency, and code domain resources, to increase channel measurement times within a unit time and enhance network capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing LTE system uses traditional SRS configuration with limited symbols per subframe, then the system maintains simple subframe structure, but the channel measurement capacity is insufficient to meet increasing requirements
Solution Approach 1:
The subframe is segmented into multiple SRS symbol positions (first SRS symbol and second SRS symbol) within the same subframe. This segmentation allows multiple SRS transmissions per subframe, increasing channel measurement capacity without fundamentally changing the overall subframe structure. The patent divides the time domain resources into distinct symbol positions for SRS transmission.
Solution Approach 2:
The patent implements periodic SRS transmission patterns where SRS symbols are configured at regular intervals within subframes. The network can configure different periodicities and offsets for SRS transmissions, allowing systematic channel measurements at multiple time points while maintaining predictable resource allocation patterns.
2Loss of time
If multiple SRS resources are allocated to increase channel measurement times, then the channel measurement requirement is satisfied, but the resource allocation complexity increases
Solution Approach 1:
The patent extends SRS resource allocation into the time dimension by configuring multiple SRS symbols within a single subframe. Instead of only increasing frequency resources or code domain resources, the invention adds a time dimension with multiple SRS opportunities per subframe, thereby increasing channel measurement time without proportionally increasing overall resource allocation complexity.
Solution Approach 2:
The configured SRS resources can serve multiple functions: channel estimation for uplink, channel quality indication, and support for multiple antenna configurations. The same SRS symbol configuration mechanism supports both single-antenna and multi-antenna scenarios, as well as different SRS transmission purposes, reducing the need for separate specialized resource allocations.
3Productivity
If the network increases the quantity of channel measurement times within unit time, then the channel measurement requirement is satisfied, but the SRS capacity in existing configuration becomes insufficient
Solution Approach 1:
The patent merges multiple SRS transmission opportunities into a single subframe configuration. By combining first SRS symbol and second SRS symbol within the same subframe structure, the system achieves multiple channel measurements per subframe without requiring separate subframes for each measurement, effectively increasing SRS capacity and measurement frequency.
Solution Approach 2:
The patent introduces dynamic SRS configuration capabilities where the network can flexibly adjust the number, position, and parameters of SRS symbols based on channel conditions and measurement requirements. The configuration can be adapted dynamically through RRC signaling and MAC CE commands, allowing the system to optimize channel measurement frequency according to actual network needs rather than being fixed.
Data Source
AI summary
Embodiments of the present disclosure includes example subframe configuration methods and related devices. One example method includes configuring, by a network-side device, a target subframe, where the target subframe includes at least one sounding reference signal (SRS) symbol used to send an SRS signal. The network-side device can then send first configuration signaling to a terminal device, where the first configuration signaling includes a resource configuration of the target subframe or an SRS configuration of the target subframe.