Sounding Reference Signal Control for Dynamic Symbol Allocation
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Solution Overview
Problem
Existing cellular communication technologies lack an efficient and fast mechanism to dynamically adjust the number of symbols used for SRS transmissions based on changing channel conditions, leading to wastage of radio resources and inefficient resource usage.
Innovation Solution
Implementing a method to reuse the SRS request field in DCI and MAC CE messages for periodic SRS transmission, allowing dynamic switching of SRS symbols based on channel conditions, using DCI format 0_1/1_1 and MAC CE for efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RRC messages are used to establish SRS mode, then SRS configuration is achieved, but the mechanism is slow and cannot dynamically adjust to changing channel conditions
Solution Approach 1:
The patent transforms the static SRS configuration established by RRC messages into a dynamic system by introducing DCI format 0_1/1_1 messages that can modify the number of SRS symbols in real-time. This allows the system to adapt quickly to changing channel conditions while maintaining the initial configuration framework provided by RRC messages.
Solution Approach 2:
The patent segments the SRS configuration into two parts: the initial configuration established by RRC messages and the dynamic adjustments made by DCI format 0_1/1_1 messages. This segmentation allows the system to maintain a stable baseline configuration while enabling rapid dynamic modifications without requiring complete reconfiguration.
2Productivity
If the number of SRS symbols is fixed, then resource allocation is simple, but radio resources are wasted when channel conditions change
Solution Approach 1:
The patent changes the parameter of SRS symbol count from a fixed value to a dynamically adjustable parameter. By using DCI format 0_1/1_1 messages to indicate different numbers of SRS symbols (1, 2, or 4 symbols), the system can optimize resource efficiency according to channel conditions while maintaining manageable control complexity through standardized message formats.
3Measurement precision
If more SRS symbols are transmitted, then channel quality measurement is more accurate, but radio resource usage increases
Solution Approach 1:
The patent applies partial action by allowing the system to transmit only the necessary number of SRS symbols (1, 2, or 4) based on current channel conditions. When channel conditions are good, fewer symbols are transmitted, reducing resource consumption. When conditions deteriorate, the system can increase the number of symbols to maintain measurement accuracy, optimizing the balance between measurement precision and resource usage.
Data Source
AI summary
A system can communicate broadband cellular communications with a user equipment. The system can send a radio resource control message to the user equipment to establish a sounding reference signal mode for the broadband cellular communications, wherein the sounding reference signal mode is a periodic mode. The system can send a second message in a second format to the user equipment, wherein the second format differs from a radio resource control format, and wherein the second message indicates changing a number of sounding reference signal positions. The system can receive, from the user equipment, a third message that utilizes the number of sounding reference signal positions to convey sounding reference signal information. The system can save an indication of a channel quality that corresponds to the broadband cellular communications based on the sounding reference signal information in the third message.