TRP Selection Using CTDSIF to Limit CSI Aging in CJT
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Solution Overview
Problem
The selection of unsuitable candidate TRPs in coherent joint transmission (CJT) leads to rapid changes in the equivalent channel, making it highly sensitive to CSI aging, which significantly degrades CJT performance.
Innovation Solution
A method and device for selecting a TRP based on a channel time-domain selectivity increasement factor (CTDSIF) and a threshold, considering factors like Doppler shift, time intervals, and load, to determine suitable candidate TRPs for joint transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If unsuitable candidate TRPs are selected for coherent joint transmission, then the number of TRPs for joint transmission is increased, but the equivalent channel changes rapidly making it highly sensitive to CSI aging
Solution Approach 1:
The patent introduces a new parameter CTDSIF (Channel Time-Domain Selectivity Increasement Factor) to quantify the time-domain selectivity change of the equivalent channel when adding candidate TRPs. By calculating and comparing CTDSIF values against thresholds, the system dynamically selects TRPs that minimize channel variability, thereby reducing CSI aging sensitivity while maintaining multi-TRP transmission benefits
Solution Approach 2:
The patent implements a feedback mechanism where the UE measures the CTDSIF of the equivalent channel formed by serving TRP and candidate TRP, reports this information to the network device, and the network device uses this feedback to make informed decisions about TRP selection for coherent joint transmission, ensuring optimal channel stability
2Adaptability or versatility
If more candidate TRPs are selected to join serving TRP for CJT transmission, then transmission diversity is improved, but the equivalent channel becomes more sensitive to CSI aging
Solution Approach 1:
The patent uses CTDSIF as a key parameter to evaluate and compare different TRP combination scenarios. By calculating the CTDSIF for each candidate TRP combination and selecting combinations with lower values, the system achieves transmission diversity through multiple TRPs while maintaining channel stability and reducing CSI aging sensitivity
Solution Approach 2:
The patent employs dynamic TRP selection based on real-time channel conditions. The CTDSIF calculation and comparison process allows the system to adaptively adjust which TRPs are selected for coherent joint transmission, optimizing the balance between transmission diversity and channel stability according to current environmental conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces CSI aging by selecting appropriate TRPs for joint transmission, enhancing CJT performance by considering time-domain changes in the equivalent channel.
Implementation Method 1
the first CTDSIF is determined based on a Doppler-domain bandwidth increasement factor or a normalized Doppler offset factor; wherein the Doppler-domain bandwidth increasement factor is determined based on a first bandwidth and a second bandwidth, the first bandwidth is determined by a Doppler-domain bandwidth of a composite channel
Data Source
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AI summary
Provided in the embodiments of the present disclosure are a TRP selection method and apparatus, and communication device, a communication system and a storage medium. The TRP selection method is executed by a UE, and comprises: determining a first CTDSIF of at least one first TRP, wherein the first CTDSIF is a CTDSIF of a first channel, which is a channel from the first TRP to the UE; acquiring a first threshold, wherein the first threshold is used for indicating a threshold of the CTDSIF; and on the basis of the first CTDSIF and the first threshold, determining whether to select the first TRP as a third TRP.