What is the purpose of deltaTib in 36.101 for inter-band CA?

For carrier aggregation the UE is allowed to set its configured maximum output power PCMAX,c  on serving cell c and its total configured maximum output power PCMAX.

The configured maximum output power on serving cell c shall be set within the following bounds: PCMAX_L,c ≤  PCMAX,c  ≤  PCMAX_H,c

 For inter-band carrier aggregation:

–           PCMAX_L,c = MIN { PEMAX,c – TC,c,  PPowerClass – MAX(MPR c + A-MPR TIB,c, P-MPR c) – TC, c }

–           PCMAX_H,c = MIN {PEMAX,c, PPowerClass}

–           PEMAX, c is the value given by IE P-Max for serving cell c.

–           PPowerClass is the maximum UE power.

–           TIB,c is the additional tolerance for serving cell c.

For inter-band carrier aggregateion, MPR c and A-MPR c apply per serving cell c. For intra-band contiguous carrier aggregation, MPR c = MPR and A-MPR c = A-MPR with MPR and A-MPR.

–           P-MPR c accounts for power management for serving cell c. For intra-band contiguous carrier aggregation, there is one power management term for the UE, P-MPR, and P-MPR c = P-MPR.

–           TC,c = 1.5 dB or 0 dB.

 For inter-band carrier aggregation with one UL serving cell the total configured maximum output power PCMAX shall be set within the following bounds: PCMAX_L ≤  PCMAX  ≤  PCMAX_H

Where:

–           PCMAX_L   = PCMAX_L,c

–           PCMAX_H   = PCMAX_H,c

For intra-band contiguous carrier aggregation, Pcmax,c is calculated under the assumption that the transmit power is increased by the same amount in dB on all component carriers.

For inter-band carrier aggregation, Pcmax,c is calculated under the assumption that the transmit power is increased independently on all component carriers.

The measured maximum output power PUMAX shall be within the following bounds: PCMAX_L  –  T(PCMAX_L)  ≤  PUMAX  ≤  PCMAX_H  +  T(PCMAX_H)

 –           T(PCMAX) applies to PCMAX_L and PCMAX_H separately.

 For carrier aggregation with two UL serving cells, the total configured maximum output power PCMAX shall be set within the following bounds: PCMAX_L_CA ≤  PCMAX  ≤  PCMAX_H_CA

For intra-band contiguous carrier aggregation,

–           PCMAX_L _CA = MIN{10 log10 ∑ pEMAX,c  – T, PPowerClass – MAX(MPR + A-MPR, P-MPR ) – TC}

–           PCMAX_H_CA  = MIN{10 log10 ∑ pEMAX,c , PPowerClass}

where

–           pEMAX,c is the linear value of PEMAX, c which is given by IE P-Max for serving cell c.

–           PPowerClass is the maximum UE power.

–           MPR and A-MPR specified above.

–           P-MPR is the power management term for the UE.

–           TC is the highest value TC,c among all serving cells c in the subframe over both timeslots. TC,c = 1.5 dB or 0 dB (does not apply to the serving cell c)

For inter-band carrier aggregation with up to one serving cell c per operating band:

PCMAX_L_CA  = MIN {10log10∑ MIN [ pEMAX,c/ (tC,c),  pPowerClass/(mprc·a-mprc·tC,c ·tIB,c) , pPowerClass/(pmprc·tC,c) ], PPowerClass}

PCMAX_H_CA  = MIN{10 log10 ∑ pEMAX,c , PPowerClass}

where

–           pEMAX,c is the linear value of PEMAX, c which is given by IE P-Max for serving cell c.

–           PPowerClass is the maximum UE power. pPowerClass is the linear value of PPowerClass.

–           MPR c and A-MPR c apply per serving cell c. mpr c is the linear value of MPR c. a-mpr c is the linear value of A-MPR c.

–           P-MPR c accounts for power management for serving cell c. pmprc is the linear value of P-MPR c.

–           tC,c = 1.41 (not in all cases).

–           tC,c = 1 (not in all cases).

–           tIB,c  is the linear value of the inter-band relaxation term of the serving cell TIB,ctIB,cwhen no inter-band relaxation is allowed.

The measured maximum output power PUMAX over all serving cells shall be within the following range:

PCMAX_L_CA  –  T(PCMAX_L_CA)  ≤  PUMAX  ≤  PCMAX_H_CA  +  T(PCMAX_H_CA)

PUMAX = 10 log10 ∑ pUMAX,c 

where pUMAX,c  denotes the measured maximum output power for serving cell c expressed in linear scale.

The tolerance T(PCMAX) applies to PCMAX_L_CA and PCMAX_H_CA separately.

For the UE which supports inter-band carrier aggregation configurations with uplink assigned to one E-UTRA band the ΔTIB,c is defined for applicable bands:

  • Inter-band CA Configuration = CA_1A-5A -> For E-UTRA Band= 1 or 5 the value of ΔTIB,c  [dB] is 0.3.
  • Inter-band CA Configuration = CA_1A-19A -> For E-UTRA Band= 1 or 19 the value of ΔTIB,c  [dB] is 0.3.

 The ΔTIB,c above have been derived for a UE supporting a single interband LTE CA band combination. For a UE supporting additional interband LTE CA band combinations, the ΔTIB,c for all bands supported by the UE, need to be studied.

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