Fixed UE Rx-Tx Timing for RTT Propagation Delay Compensation
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Solution Overview
Problem
In wireless communication networks, delays between base stations (BS) and user equipment (UE) introduce uncertainty and latency, necessitating costly and resource-intensive methods for delay compensation, such as measuring and calculating propagation delays.
Innovation Solution
Employing a fixed UE reception-transmission (Rx-Tx) time difference to determine propagation delay, where the UE transmits a sounding reference signal (SRS) after a predetermined time from receiving a positioning reference signal (PRS), and the BS measures and communicates the delay using medium access control-control elements (MAC-CE) or physical downlink control channels (PDCCH).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional delay measurement methods are used, then propagation delay can be measured, but the process is costly and resource-intensive
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with a fixed Rx-Tx time difference value before the actual delay measurement process. This predetermined time difference is established in advance through system configuration or initial setup, eliminating the need for complex real-time measurements at the UE end. The BS then uses this pre-configured value combined with measured round-trip time to calculate propagation delay, significantly simplifying the overall measurement process while maintaining accuracy.
2Loss of time
If delay measurement and compensation techniques are implemented, then communication latency is reduced, but network traffic and processing resources increase
Solution Approach 1:
The patent implements self-service by having the UE autonomously apply the calculated propagation delay compensation using its own pre-configured fixed Rx-Tx time difference. The UE independently calculates the propagation delay based on the round-trip time measurement and the fixed time difference, then applies compensation without requiring continuous complex processing or additional network resources. This self-service approach reduces processing power consumption while effectively minimizing communication latency.
3Measurement precision
If dynamic Rx-Tx time difference measurement is used, then measurement accuracy improves, but measurement time and processing requirements increase
Solution Approach 1:
The patent applies parameter changes by transforming the Rx-Tx time difference from a dynamic measured parameter to a fixed predetermined parameter. Instead of continuously measuring and adjusting the Rx-Tx time difference in real-time, the system uses a pre-configured fixed value that remains constant throughout the communication process. This parameter change from dynamic to static significantly reduces measurement time and processing requirements while maintaining sufficient measurement accuracy for effective propagation delay compensation.
Data Source
AI summary
Wireless communications systems and methods related to determining and transmitting delay measurements, such as propagation delay, between a base station (BS) and a user equipment (UE) are provided. In some aspects, a UE may receive, from a BS, a positioning reference signal (PRS). The UE may further transmit, in response to and at a predetermined time after the receiving the PRS, a sounding reference signal (SRS) to the BS. Further, the UE may receive, from the BS, a delay measurement corresponding to the PRS.