Section: 6.1.3.6a Extended Power Headroom Report MAC Control Elements
Content: For extendedPHR, the Extended Power Headroom Report (PHR) MAC control element is identified by a MAC PDU subheader with LCID as specified in table 6.2.1-2. It has a variable size and is defined in Figure 6.1.3.6a-2. When Type 2 PH is reported, the octet containing the Type 2 PH field is included first after the octet indicating the presence of PH per SCell and followed by an octet containing the associated PCMAX,c field (if reported). Then follows an octet with the Type 1 PH field and an octet with the associated PCMAX,c field (if reported), for the PCell. If SRS-ConfigAdd-r16 is configured for the PCell then follows an octet with the Type 3 PH field and an octet with the associated PCMAX,c field (if reported), for the PCell. And then follows in ascending order based on the ServCellIndex, as specified in TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [8] an octet with the Type x PH field, wherein x is equal to 3 when the ul-Configuration-r14 or SRS-ConfigAdd-r16 is configured for this SCell, x is equal to 1 otherwise, and an octet with the associated PCMAX,c field (if reported), for each SCell indicated in the bitmap. For extendedPHR2, the Extended Power Headroom Report (PHR) MAC control elements are identified by a MAC PDU subheader with LCID as specified in table 6.2.1-2. They have variable sizes and are defined in Figure 6.1.3.6a1-3, Figure 6.1.3.6a2-4 and Figure 6.1.3.6a3-5. One octet with C fields is used for indicating the presence of PH per SCell when the highest SCellIndex of SCell with configured uplink is less than 8, otherwise four octets are used. When Type 2 PH is reported for the PCell, the octet containing the Type 2 PH field is included first after the octet(s) indicating the presence of PH per SCell and followed by an octet containing the associated PCMAX,c field (if reported). Then follows the Type 2 PH field for the PUCCH SCell (if PUCCH on SCell is configured and Type 2 PH is reported for the PUCCH SCell), followed by an octet containing the associated PCMAX,c field (if reported). Then follows an octet with the Type 1 PH field and an octet with the associated PCMAX,c field (if reported), for the PCell. If SRS-ConfigAdd-r16 is configured for the PCell then follows an octet with the Type 3 PH field and an octet with the associated PCMAX,c field (if reported), for the PCell. Then follows in ascending order based on the ServCellIndex, as specified in TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [8] an octet with the Type x PH field, wherein, x is equal to 3 when the ul-Configuration-r14 or SRS-ConfigAdd-r16 is configured for this SCell, x is equal to 1 otherwise, and an octet with the associated PCMAX,c field (if reported), for each SCell indicated in the bitmap. The Extended PHR MAC Control Elements are defined as follows: - Ci: this field indicates the presence of a PH field for the SCell with SCellIndex i as specified in TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [8]. The Ci field set to "1" indicates that a PH field for the SCell with SCellIndex i is reported. The Ci field set to "0" indicates that a PH field for the SCell with SCellIndex i is not reported; - R: reserved bit, set to "0"; - V: this field indicates if the PH value is based on a real transmission or a reference format. For Type 1 PH, V=0 indicates real transmission on PUSCH and V=1 indicates that a PUSCH reference format is used. For Type 2 PH, V=0 indicates real transmission on PUCCH/SPUCCH and V=1 indicates that a PUCCH/SPUCCH reference format is used. For Type 3 PH, V=0 indicates real transmission on SRS and V=1 indicates that an SRS reference format is used. Furthermore, for Type 1, Type 2 and Type 3 PH, V=0 indicates the presence of the octet containing the associated PCMAX,c field, and V=1 indicates that the octet containing the associated PCMAX,c field is omitted; - Power Headroom (PH): this field indicates the power headroom level. The length of the field is 6 bits. The reported PH and the corresponding power headroom levels are shown in Table 6.1.3.6-1 (the corresponding measured values in dB can be found in clause 9.1.8.4 of TS 36.133[ Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements for support of radio resource management ]  [9]); - P: this field indicates whether the MAC entity applies power backoff due to power management (as allowed by P-MPRc, see TS 36.101[ Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception ]  [10]). The MAC entity shall set P=1 if the corresponding PCMAX,c field would have had a different value if no power backoff due to power management had been applied; - PCMAX,c: if present, this field indicates the PCMAX,c or , as specified in TS 36.213[ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures ]  [2] used for calculation of the preceding PH field. The reported PCMAX,c and the corresponding nominal UE transmit power levels are shown in Table .6a-1 (the corresponding measured values in dBm can be found in clause of TS 36.133[ Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements for support of radio resource management ]  [9]). Figure 6.1.3.6a-1: Void Figure 6.1.3.6a-2: Extended PHR MAC Control Element Figure 6.1.3.6a1-3: Extended PHR MAC Control Element supporting PUCCH on SCell Figure 6.1.3.6a2-4: Extended PHR MAC Control Element supporting 32 serving cells with configured uplink Figure 6.1.3.6a3-5: Extended PHR MAC Control Element supporting 32 serving cells with configured uplink and PUCCH on SCell Table .6a-1: Nominal UE transmit power level for Extended PHR and for Dual Connectivity PHR