Channel Estimation With Additional Reference Signals for URLLC
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Solution Overview
Problem
Wireless communication systems face challenges in achieving robust and accurate channel estimations, particularly for applications sensitive to channel conditions, leading to potential failures.
Innovation Solution
The allocation of additional reference signals, such as CSI-RSs and SRSs, to resource elements of a transmission time interval (TTI) to improve channel estimation accuracy, including configurations for downlink and uplink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional channel estimation methods are used, then system complexity is low, but channel estimation accuracy is insufficient for applications sensitive to channel conditions
Solution Approach 1:
The patent applies preliminary action by allocating additional reference signals (CSI-RS for downlink, SRS for uplink) in advance before actual data transmission. These reference signals are pre-configured in the resource allocation, allowing the receiving device to perform channel estimation before receiving the actual data, thereby improving estimation accuracy without increasing the complexity of the data transmission process itself.
Solution Approach 2:
The patent uses reference signals as intermediary elements between the transmitting and receiving devices. These reference signals (CSI-RS and SRS) serve as mediators that carry channel information, allowing the receiving device to estimate channel conditions without directly analyzing the data signals. This intermediary approach improves measurement precision while keeping the system complexity manageable through standardized reference signal processing.
2Reliability
If additional reference signals are allocated to improve channel estimation accuracy, then reliability of channel estimation improves, but resource consumption increases
Solution Approach 1:
The patent applies local quality by allocating reference signals to specific resource elements based on local channel conditions and application requirements. Instead of uniformly increasing reference signal density across all resources, the system selectively allocates additional CSI-RS or SRS resources to specific time-frequency resources where channel estimation reliability is most critical, thereby improving reliability while minimizing overall resource consumption.
Solution Approach 2:
The patent implements partial action by allocating reference signals selectively rather than comprehensively. The system determines the minimum necessary number of reference signals required to achieve the desired channel estimation reliability for specific applications (such as URLLC), allocating just enough resources to meet the reliability requirement without excessive resource consumption across the entire system.
3Measurement precision
If more reference signals are transmitted, then channel estimation accuracy improves, but transmission overhead increases
Solution Approach 1:
The patent applies dynamics by making reference signal allocation flexible and adaptive rather than static. The system can dynamically adjust the number and position of reference signals (CSI-RS for downlink, SRS for uplink) based on varying channel conditions, traffic types, and application requirements. This dynamic allocation allows the system to optimize the balance between measurement precision and transmission overhead in real-time, transmitting more reference signals only when and where needed.
Data Source
AI summary
Techniques are described herein for performing channel estimation for both uplink and downlink channels. Additional reference signals may be allocated or assigned to various resource elements (REs) of a transmission time interval (TTI). The receiving device (e.g., a base station or a user equipment (UE)) may be configured to use the additional reference signals during channel estimation. The use of additional reference signals may improve the accuracy of the channel estimations. In downlink communications, a base station may allocate one or more channel state information reference signals (CSI-RSs) to a port of a UE. In uplink communications, a UE may transmit several sounding reference signals (SRSs) in a group.