CSI-RS EPRE Allocation for Inter-Band CA Without SSB
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel state information (CSI) reference signal energy per resource element (EPRE) for carriers without synchronization signal blocks (SSBs) in inter-band carrier aggregation, which affects time and frequency tracking and measurement accuracy.
Innovation Solution
A method and apparatus at a network node for determining CSI-RS EPREs based on received SSB transmit power information, enabling processes such as time or frequency tracking and measurement generation in carriers without SSB transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If carriers without SSB transmission are used in inter-band carrier aggregation, then device complexity and resource efficiency are improved, but time and frequency tracking accuracy deteriorates
Solution Approach 1:
The patent introduces CSI-RS (Channel State Information Reference Signal) as an intermediary signal to replace SSB for time and frequency tracking in carriers without SSB transmission. The network node transmits CSI-RS in these carriers, and the user equipment uses the CSI-RS to perform tracking operations, thereby maintaining tracking accuracy while avoiding the complexity of SSB transmission in all carriers.
2Loss of energy
If SSB transmit power information is not provided for carriers without SSB transmission, then resource efficiency is improved, but measurement accuracy deteriorates
Solution Approach 1:
The patent uses CSI-RS as an intermediary measurement signal for carriers without SSB transmission. The network node provides CSI-RS resource configuration and power information (CSI-RS power offset relative to SSB power) to the user equipment, enabling accurate channel state measurement and CSI reporting without requiring actual SSB transmission in these carriers, thus saving energy while maintaining measurement accuracy.
3Measurement precision
If CSI-RS power offset information is provided for carriers without SSB, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent changes the power parameter representation by using a relative power offset (CSI-RS power offset) instead of absolute power values for CSI-RS transmission in carriers without SSB. The network node configures the CSI-RS power offset as an indexed parameter that the user equipment uses to calculate the actual CSI-RS power based on the SSB power, simplifying power management while ensuring accurate measurement.
Data Source
AI summary
Apparatus, methods, and computer program products for DL power allocation in inter-band CA with carriers with no SSB transmissions are provided. An example method may include receiving, from a second network node, SSB transmit power information for at least one carrier of a set of carriers, where the set of carriers may be associated with inter-band carrier aggregation, and where the SSB transmit power information may be indicative of an SSB transmit power or an SSB transmit power offset. The example method may further include determining a set of CSI-RS EPREs based on the SSB transmit power information for the at least one carrier, where the set of CSI-RS EPREs corresponds to a CSI-RS transmission in a first carrier of the set of carriers, where the first carrier is configured without SSB transmission.