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Hence, the limitation of the ETC caused by the system reliability is more increased at the high variation of the received SIR. Another important task is to estimate the magnitude of change in the system capacity due to the disturbance of the system parameters. In sensitivity theory, it is easy to calculate the change in the system behavior due to the given parameter variations when the sensitivity is known. 2 when the system reliability and the standard deviation are given as βo% = 98% and σxo = 1 dB.
Note that the same variation of the system reliability induces a higher change of the system capacity at the high system reliability than at the low system reliability. Furthermore, the effect of system reliability on system capacity caused by the disturbance of the standard variation of the received SIR is also considered because the limitation of system capacity by system reliability is related with the standard C$ ETC ∆σ x deviation of the received SIR. 024 / ln 10)σ 2x o . 3. 2, curve (b) shows the change of ETC caused by the 10% change of the standard deviation of the received SIR, as the normal value of system reliability varies between 90% and 99%.
10), we can derive the relation between the user numbers and the required SIRs. 11) is set to zero. 14) This equation specifies a capacity plane in the N dimensional space. All points (Nv, Nd1, Nd2, …, NdN–1) under the hyperplane represent possible numbers of supportable users in voice and data user groups in a sector. 13), total resource amount of the system, the resource amount used by one voice user, and the resource amount used by one data user in the group i correspond to 1, γv, and γdi, respectively.