Aperiodic Reference Signal Transmission in OFDMA Systems
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Solution Overview
Problem
Current wireless communication systems lack an effective method for aperiodic transmission of reference signals in OFDMA systems, which is necessary for rapid channel state measurement and prevention of collisions with periodic reference signals.
Innovation Solution
A method and apparatus for aperiodically transmitting and receiving reference signals using implicit information, where configuration information is transmitted through a physical channel to control the aperiodic transmission of SRS, and parameters are set to prevent collisions with periodic reference signals, allowing dynamic resource allocation and rapid channel measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reference signals are transmitted periodically, then channel state information can be obtained regularly, but the system lacks flexibility for rapid channel measurement when needed
Solution Approach 1:
The patent implements dynamic reference signal transmission by introducing an aperiodic SRS transmission mechanism triggered by downlink control information. The base station can dynamically activate or deactivate SRS transmission based on current channel conditions and scheduling needs, allowing the system to adapt between periodic and aperiodic modes. This resolves the contradiction by enabling flexible channel measurement timing without being constrained to fixed periodic intervals.
2Speed
If aperiodic reference signal transmission is implemented, then rapid channel state measurement is enabled, but collision with periodic reference signals may occur
Solution Approach 1:
The patent applies preliminary action by having the base station schedule and coordinate aperiodic SRS transmissions in advance through downlink control information. Before triggering an aperiodic SRS transmission, the base station ensures that the timing and resource allocation are pre-planned to avoid conflicts with periodic reference signals. This coordination mechanism prevents collisions while maintaining the speed advantage of aperiodic transmission.
3Productivity
If configuration information for aperiodic SRS is transmitted through physical channel, then rapid control is achieved, but the amount of control signaling increases
Solution Approach 1:
The patent makes the downlink control information format multi-functional by incorporating both uplink grant information and aperiodic SRS triggering information in the same message. The DCI format is designed to serve multiple purposes: scheduling uplink data transmission and simultaneously controlling aperiodic reference signal transmission. This reduces signaling overhead by combining multiple control functions into a single universal message structure.
Data Source
AI summary
Disclosed are a method and a device for transmitting and receiving an aperiodic reference signal. The method for receiving an aperiodic reference signal comprises: allowing a reference signal receiving device to determine a radio resource area that can be calculated by environmental information from a first reference signal transmission device, and to transmit an aperiodic reference signal to the first reference signal transmission device by including first instruction information which instructs the aperiodic reference signal to be transmitted in the radio resource area; transmitting the aperiodic reference signal by including second instruction information which instructs a second reference signal transmission device, to which a periodic reference signal is to be transmitted in said radio resource area; and receiving the aperiodic reference signal from the first reference signal transmission device in the radio resource area.