Pseudo-random SRS Transmission for Interference Reduction
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sounding reference signal (SRS) transmissions, particularly in reducing interference and ensuring optimal channel availability.
Innovation Solution
A method and apparatus for pseudo-random SRS transmission, where a user equipment (UE) obtains a set of binary sequences indicating candidate SRS transmission occasions, selects a binary sequence based on a pseudo-random sequence, and transmits the SRS accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SRS transmissions are performed continuously, then channel availability is maximized, but interference between multiple UEs increases
Solution Approach 1:
The patent implements periodic SRS transmission patterns where UEs transmit SRS signals at scheduled intervals rather than continuously. The network configures transmission occasions and periods, creating a periodic action that balances channel availability with interference reduction through time-division multiplexing.
Solution Approach 2:
The patent extracts specific transmission occasions from a continuous time period, selecting discrete moments when SRS should be transmitted. By taking out only the necessary transmission instances rather than maintaining continuous transmission, the system reduces interference while preserving adequate channel availability for channel state information gathering.
2Object-generated harmful factors
If SRS transmissions are muted randomly, then interference is reduced, but channel availability decreases
Solution Approach 1:
The network performs preliminary configuration by providing UE-specific and common SRS configuration information in advance. This includes pre-configuring transmission occasions, periods, and muting patterns through higher layer signaling, so that when SRS transmission occurs, the timing and interference avoidance decisions are already optimized based on prior network knowledge of channel conditions and UE requirements.
Solution Approach 2:
The system incorporates feedback mechanisms where the network monitors channel conditions and UE reports, then adjusts SRS transmission configuration accordingly. The network uses this feedback to dynamically configure transmission occasions and muting patterns, ensuring that interference reduction does not excessively compromise channel availability for accurate channel state estimation.
3Reliability
If multiple UEs transmit SRS simultaneously, then channel availability is maintained, but interference between UEs increases
Solution Approach 1:
The patent segments the SRS transmission time period into distinct transmission occasions assigned to different UEs. By dividing the time resource into separate slots or periods for different UEs, the system allows multiple UEs to access the channel without simultaneous transmission, thereby reducing mutual interference while maintaining overall channel availability through continuous transmission across different time segments.
Solution Approach 2:
The system dynamically configures SRS transmission parameters including timing, frequency, and muting patterns based on current network conditions. The network can adaptively adjust transmission occasions and periods in response to changing channel conditions, traffic demands, and interference levels, allowing flexible optimization of the balance between channel availability and interference reduction.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may obtain a set of binary sequences, each binary sequence in the set of binary sequences indicating a number of candidate sounding reference signal (SRS) transmission occasions for a time period, wherein a first value for a location in a binary sequence indicates that an SRS is to be transmitted for an SRS transmission occasion corresponding to the location and a second value for the location in the binary sequence indicates that the SRS is not to be transmitted for the SRS transmission occasion corresponding to the location. The UE may select a binary sequence from the set of binary sequences based at least in part on a pseudo-random sequence. The UE may transmit the SRS in accordance with the selected binary sequence. Numerous other aspects are described.