Quantum critical points (QCPs) have attracted continuous scientific interest due to the emergent phenomena observed in their vicinity, including unconventional superconductivity and quantum magnetism. Understanding quantum criticality is therefore of great interest, and heavy fermion materials are particularly useful in this regard. Recently “local quantum criticality” has been invoked theoretically, where the Fermi surface is the critical degree of freedom. CeRhIn5 is believed to be a candidate for a local QCP, but the issue remains controversial. Theory suggests a “global phase diagram” in which the type of QCP depends on the amount of frustration in the system. So far, however, there has been little effort to quantify the frustration in candidate materials. We propose to quantify the magnetic frustration in CeRhIn5 using inelastic neutron scattering.