Multi-TRP CSI Reporting With CMR and IMR for Accurate CQI
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-TRP operation of 5G New Radio (NR), individual CSI measurements for each beam pair link fail to reflect the real channel quality when multiple links are used for DL transmissions.
Innovation Solution
The UE performs CSI measurements for both beam pairs and transmits both sets of measurements to each gNB, incorporating channel and interference measurement resources to determine a comprehensive CSI report, including configurations for CMRs and IMRs to account for neighbor cell interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual CSI measurements are performed for each beam pair link, then measurement simplicity is maintained, but channel quality reflection accuracy deteriorates
Solution Approach 1:
The patent segments the CSI measurement process into separate components: beam pair link measurements and interference measurements. By dividing the measurement task, the system can accurately capture both the desired signal and interference effects without requiring a completely new measurement approach, thus improving accuracy while managing complexity through structured division of work.
Solution Approach 2:
The patent merges beam pair link CSI measurements with interference measurements to create a comprehensive channel quality assessment. By combining these measurement types, the system achieves accurate channel quality reflection that accounts for both the primary signal path and interference from other TRPs, resolving the contradiction between measurement simplicity and accuracy.
2Reliability
If multiple TRPs are connected simultaneously on the same carrier, then transmission reliability is improved, but interference measurement difficulty increases
Solution Approach 1:
The patent introduces interference measurement resources (IMRs) as intermediary elements that facilitate accurate interference detection. These IMRs act as mediators between the multiple TRPs, enabling the UE to measure interference from secondary TRPs without disrupting the primary communication links, thus maintaining reliability while solving the measurement difficulty.
Solution Approach 2:
The patent performs interference measurements in advance using configured IMRs before actual data transmission occurs. By conducting these measurements preliminarily, the system prepares accurate channel quality information ahead of time, enabling reliable transmission decisions without the complexity of real-time interference analysis during active communication.
3Measurement precision
If comprehensive CSI measurements including interference are performed, then channel quality accuracy is improved, but reporting complexity increases
Solution Approach 1:
The patent applies local quality by measuring and reporting channel quality parameters specific to each beam pair link and interference source. Instead of providing a single complex aggregate measurement, the system breaks down the channel quality into localized components (per-TRP, per-beam-pair) that can be individually managed and reported, reducing overall reporting complexity while maintaining comprehensive accuracy.
Data Source
AI summary
Various manners of reporting channel state information (CSI) measurements in a multiple transmission and reception point (multi-TRP) configuration are provided. A UE may perform channel state information (CSI) measurements for a channel measurement resource (CMR) for the first gNB and at least one interference measurement resource (IMR) for the at least one second gNB, determine a configuration for a CSI report for the CSI measurements including a channel quality indicator (CQI) measurement for the CMR and the at least one IMR and transmit the CSI report to at least one of the first gNB and the at least one second gNB.