Aperiodic SRS Transmission via High-Layer Signaling
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Solution Overview
Problem
Current technologies for aperiodic SRS resource scheduling in LTE-A systems lead to increased PDCCH resource consumption and inefficiency, especially with multiple users, making it unaffordable and resulting in resource wastage.
Innovation Solution
Configuring time-domain parameters of aperiodic SRS through high-layer or PDCCH signalling allows flexible and efficient time-domain transmission, enabling the terminal equipment to send aperiodic SRS in multiple subframes with low sounding delay and high bandwidth, and permitting flexible timing modes with reduced scheduling restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dedicated DCI format for SRS is introduced to configure aperiodic SRS parameters dynamically, then scheduling flexibility and resource configuration capability are improved, but PDCCH resource consumption increases significantly
Solution Approach 1:
The patent applies universality by making the existing DCI formats (used for uplink grants) multi-functional. Instead of creating a dedicated DCI format solely for SRS configuration, the patent enables these existing formats to carry both uplink grant information and aperiodic SRS configuration information through the use of specific field combinations and interpretations. This allows one signaling mechanism to serve multiple purposes, thereby improving scheduling flexibility without proportionally increasing PDCCH resource consumption.
Solution Approach 2:
The patent merges the aperiodic SRS configuration function with the existing uplink grant DCI formats. By combining the SRS triggering and parameter configuration into the same DCI structure that already carries uplink scheduling information, the patent reduces the need for separate dedicated signaling resources. This merging approach allows efficient use of PDCCH resources while maintaining the ability to dynamically configure aperiodic SRS transmissions.
2Quantity of substance
If aperiodic SRS is activated with 1 bit signalling and parameters indicated through high-layer signalling, then PDCCH resource consumption is reduced, but scheduling flexibility and dynamic configuration capability are limited
Solution Approach 1:
The patent applies segmentation by dividing the SRS configuration information into two parts: semi-static parameters configured through high-layer signaling (RRC) and dynamic parameters triggered through DCI. This segmentation allows bulk configuration of SRS parameters to be done efficiently through higher-layer protocols, while dynamic activation and specific parameter adjustments are handled through compact DCI signaling. This division reduces overall signaling overhead while preserving necessary scheduling flexibility for dynamic resource allocation.
Solution Approach 2:
The patent uses preliminary action by pre-configuring SRS parameters through high-layer signaling before actual aperiodic SRS transmission is needed. The semi-static configuration includes parameters such as frequency domain resources, time domain resources, and other SRS-specific settings. When aperiodic SRS transmission is required, only a compact trigger signal is needed to activate the pre-configured parameters, significantly reducing the signaling overhead compared to transmitting all parameters dynamically each time.
3Reliability
If periodic SRS is transmitted continuously with certain periodicity, then uplink channel detection capability is maintained, but physical resource consumption increases
Solution Approach 1:
The patent utilizes periodic action by implementing aperiodic SRS transmission that is triggered based on dynamic network needs rather than continuous periodic transmission. The eNB can activate aperiodic SRS transmissions at specific moments when channel sounding is required, and deactivate them when not needed. This on-demand periodic triggering mechanism maintains uplink channel detection capability while significantly reducing physical resource consumption compared to continuous periodic SRS transmission.
Solution Approach 2:
The patent applies the principle of discarding and recovering by allowing the network to discard periodic SRS transmission when channel conditions are stable or when uplink scheduling is not active, and recover (reactivate) it when channel sounding becomes necessary. The semi-static configuration allows the network to quickly reactivate SRS parameters when needed without reconfiguring from scratch, thus maintaining reliability while reducing resource consumption during periods when SRS is not required.
Data Source
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AI summary
The present invention discloses a transmission method and apparatus for non-periodic SRS. eNB configures time-domain configuration parameter of non-periodic SRS through higher layer signalling or downlink physical control channel signalling; terminal equipment transmits non-periodic SRS in indicated time-domain resource. The application of the technical solution of the embodiments of the present invention can reduce signalling consumption through high layer semi-static configuration of time-domain resource of non-periodic SRS. On one hand, flexible non-periodic SRS time-domain transmission is allowed for terminal equipment which can send non-periodic SRS in multiple subframes, which is featured by low sounding delay and great sounding bandwidth; on the other hand, flexible timing mode is also permitted for terminal equipment which brings little restriction to scheduling.