SRS Overhearing for Fast Link Adaptation in Wireless Handover
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Solution Overview
Problem
In wireless communication systems, particularly during handover events, there is a significant throughput degradation due to the interruption time and conservative allocation of modulation and coding scheme (MCS) levels and layers, which existing technologies have not effectively addressed.
Innovation Solution
The method involves a first base station transmitting configuration information for measurement reports to a user equipment (UE), which detects events and transmits measurement reports. The first base station then forwards overhearing configuration information related to sounding reference signals (SRS) to a second base station, enabling the second base station to overhear the SRS and estimate the channel state, allowing for faster link adaptation and minimizing throughput degradation during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover is performed in wireless communication systems, then user equipment can maintain connection during movement, but throughput degradation occurs due to interruption time and conservative MCS allocation
Solution Approach 1:
The target base station performs channel state estimation using SRS overhearing before the handover is completed. By preliminarily obtaining channel information from the source base station and estimating the channel state in advance, the system prepares the necessary data for fast link adaptation, thereby reducing throughput degradation during the actual handover execution.
2Reliability
If conservative allocation of MCS levels and layers is used during handover, then connection stability is maintained, but transfer rate recovery is delayed
Solution Approach 1:
The system preliminarily estimates the channel state at the target base station before handover completion using SRS overhearing technology. This advance preparation of channel information enables faster link adaptation after handover, reducing the time required for transfer rate recovery while maintaining connection stability through conservative MCS allocation during the transition period.
Data Source
AI summary
A method of performing fast link adaptation through sounding reference signal (SRS) overhearing when handover is required as a user equipment (UE) is moved in a wireless communication system. The method includes transmitting, to a UE served by a first BS, configuration information for at least one measurement report (MR), receiving, from the UE, an MR associated with an event detected by the UE based on the configuration information for the at least one MR, and transmitting, to at least one second BS, a first message including overhearing configuration information associated with a SRS transmitted from the UE to the first BS, wherein the overhearing configuration information is used for overhearing the SRS by the at least one second BS.