Dynamic SRS Resource Reservation in LTE Terminals
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Solution Overview
Problem
In LTE networks, aperiodic SRS transmission leads to resource wastage as terminal devices reserve SRS resources even when not used, conflicting with PUCCH bandwidth and limiting data transmission.
Innovation Solution
A signal transmission method where terminal devices receive downlink control information with resource reservation indication, allowing them to determine whether to reserve physical resources in time-domain units, thereby optimizing resource utilization by reserving resources only when necessary and using them for other signals or guard periods when not needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device reserves the SRS resource for aperiodic SRS transmission, then the SRS can be transmitted when triggered, but the reserved resource cannot be used for other data transmissions causing resource waste
Solution Approach 1:
The patent makes the SRS resource reservation dynamic by introducing a trigger mechanism. The terminal device reserves the SRS resource only when triggered by downlink control information, rather than permanently reserving it. This dynamic approach allows the resource to be flexibly allocated between SRS transmission and other data transmissions based on actual needs, resolving the contradiction between ensuring SRS transmission reliability and improving resource utilization rate
Solution Approach 2:
The patent changes the reservation state parameter from static (always reserved) to conditional (reserved only when triggered). By using downlink control information to indicate whether the SRS resource should be reserved, the system transforms the resource allocation from a fixed state to a variable state that adapts to transmission requirements, thereby reducing resource waste while maintaining SRS transmission capability
2Reliability
If the terminal device reserves the last OFDM symbol for SRS transmission, then SRS can be transmitted, but the PUCCH transmission bandwidth is truncated limiting control channel capacity
Solution Approach 1:
The patent dynamically adjusts the PUCCH bandwidth allocation based on whether SRS transmission is triggered. When SRS transmission is not triggered, the terminal device can use the full bandwidth including the last OFDM symbol for PUCCH transmission, maximizing control channel capacity. When SRS transmission is triggered, the resource reservation indication allows the terminal to reserve the necessary resources, thus dynamically balancing between SRS capability and PUCCH capacity
3Reliability
If the terminal device always reserves the SRS resource, then the SRS transmission is guaranteed, but the reserved resource may not be used causing resource waste
Solution Approach 1:
The patent implements a self-service mechanism where the terminal device autonomously decides whether to reserve the SRS resource based on receiving trigger signaling. The downlink control information serves as a self-service indicator that tells the terminal whether to activate the resource reservation, eliminating the need for continuous manual configuration and allowing the system to self-optimize resource usage based on actual transmission needs
Data Source
AI summary
A signal transmission method, a terminal device and a network device are provided. The method includes: a terminal device receives downlink control information, (DCI), the DCI carries resource reservation indication information, and the resource reservation indication information indicates the terminal device whether reserve a physical resource is to be reserved in a time-domain resource unit; the terminal device determines a first physical resource used for transmitting a first signal in the time-domain resource unit according to the resource reservation indication information, or determines a second physical resource used for an uplink and downlink guard period in the time-domain resource unit according to the resource reservation indication information.