Dynamic SRS Transmission via Downlink Control Information
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Solution Overview
Problem
In LTE-Advanced, there is a lack of clear description on how the base station configures User Equipment (UE) to transmit scheduled Sounding Reference Signals (SRS), leading to inefficiencies in scheduling and potential interference due to overlapping resources, and there is a need for flexible and efficient SRS transmission control.
Innovation Solution
The method involves the base station transmitting downlink control information that includes instructions for SRS transmission and indicates the uplink component carrier, allowing the UE to transmit SRS on the specified carrier, enabling flexible and efficient scheduling by avoiding resource collisions and optimizing SRS transmission parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If periodic SRS transmission is configured with fixed periodicity, then SRS transmission is simple to implement, but scheduling flexibility is reduced and resource efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic SRS transmission control where the base station can trigger SRS transmission on demand through downlink control information rather than relying on fixed periodic configurations. This allows the system to adapt SRS transmission timing and resources dynamically based on current scheduling needs, resolving the contradiction between operational simplicity and scheduling flexibility.
2Stability of the object's composition
If SRS parameters are configured via higher layer signaling only, then configuration is stable, but dynamic scheduling response time increases
Solution Approach 1:
The patent configures SRS parameters in advance through higher layer signaling to ensure stability, while also preparing the system to respond dynamically through downlink control information triggers. This preliminary configuration approach allows the system to maintain stable parameter settings while enabling fast dynamic scheduling responses when needed.
Solution Approach 2:
The patent combines static higher layer signaling configuration with dynamic downlink control information triggering, allowing the system to switch between stable pre-configured parameters and dynamic real-time scheduling adjustments, thereby resolving the contradiction between configuration stability and scheduling response speed.
3Quantity of substance
If SRS transmission resources are overlapped with PUSCH resources, then resource utilization appears high, but interference increases and transmission reliability decreases
Solution Approach 1:
The patent introduces downlink control information as an intermediary mechanism that coordinates SRS and PUSCH resource allocation. The base station uses this intermediary to ensure SRS transmissions are triggered only when they will not conflict with PUSCH allocations, thereby maintaining high resource utilization while preventing harmful interference through centralized coordination.
Data Source
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AI summary
A communication method for sounding reference signal transmission is provided. A communication method of a user equipment in a mobile communication system in which a base station apparatus schedules a physical uplink shared channel in an uplink component carrier by using a downlink control information format, the method comprising: receiving, from the base station apparatus, the downlink control information format including first information which instructs to transmit sounding reference signal and second information which indicates the uplink component carrier in which the physical uplink shared channel is scheduled by the downlink control information format, transmitting, to the base station apparatus, sounding reference signal on the uplink component carrier indicated by the second information in case that the first information is detected.