5G CSI Computation in 4G Spectrum Coexistence
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Solution Overview
Problem
In 5G wireless communication systems, dynamic LTE-NR coexistence leads to inaccurate channel state information (CSI) computation due to unknown allocated LTE resources and scheduled resource blocks, affecting peak data rate and spectrum efficiency.
Innovation Solution
User equipment (UE) adapts CSI computation by removing NR overhead and predicted LTE overhead, using network-provided rate matching patterns or autonomous determination of LTE overhead, to accurately report CSI to the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic LTE-NR coexistence is used to increase spectrum utilization, then spectrum efficiency is improved, but channel state information accuracy deteriorates due to unknown allocated LTE resources
Solution Approach 1:
The network device performs preliminary actions by determining in advance which resource blocks are allocated for LTE transmissions and communicating this information to the NR user equipment. This allows the NR UE to pre-compute accurate CSI by excluding these predetermined LTE resources from its channel state calculations, resolving the contradiction between dynamic spectrum sharing and measurement accuracy.
2Ease of operation
If static spectrum sharing is used to simplify implementation, then ease of operation is improved, but available spectrum for both LTE and NR deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation where the network device can flexibly assign different resource blocks to LTE or NR based on real-time traffic conditions. The NR UE receives dynamic indications of LTE resource allocations and adapts its CSI computation accordingly, enabling the system to fully utilize available spectrum while maintaining implementation feasibility through standardized signaling mechanisms.
Data Source
AI summary
Systems and methods for computing channel state information in a 5G wireless communication system in 4G spectrum frequencies is described herein. A method as described herein includes determining, by network equipment comprising a processor, that a cell in which the network equipment operates is configured for coexistence between new radio signals and long term evolution signals based on a starting symbol location for non-user equipment specific control signaling received from the cell relative to a frame boundary; predicting, by the network equipment in response to the determining that the cell is configured for the coexistence, long term evolution resource overhead data associated with the long term evolution signals; and determining, by the network equipment, channel state information reference resources at least in part by removing the long term evolution resource overhead data from channel state information computation data.