Power headroom reporting with dual connectivity
Embodiments described herein relate generally to a communication between a user equipment (“UE”) and a plurality of evolved Node Bs (“eNBs”). A UE may be adapted to operate in a dual connected mode on respective wireless cells provided by first and second eNBs. The UE may be adapted to estimate respective power headroom (“PHR”) values associated with simultaneous operation on the first and second wireless cells. The UE may cause the first and second PHR estimates to be transmitted to both the first and second eNBs. The first and second eNBs may use these estimates to compute respective uplink transmission powers for the UE. Other embodiments may be described and/or claimed.
1. One or more non-transitory computer-readable media comprising compute device-executable instructions, wherein the instructions, in response to execution by a user equipment (“UE”), cause the UE to:
generate a media access control (“MAC”) control element associated with power headroom (“PHR”) information for dual connectivity, wherein the MAC control element includes:
one or more first octets associated with a master cell group, the one or more first octets to include a PHR value associated with a first wireless primary cell (“PCell”) of the master cell group; and
one or more second octets associated with a secondary cell group, the one or more second octets to include a PHR value associated with a second wireless PCell of the secondary cell group; and
cause transmitter circuitry of the UE to transmit the MAC control element to one or more evolved Node Bs.
2. The one or more computer-readable media of claim 1 , wherein the one or more first octets includes a first Type 2 PHR field to indicate the PHR value associated with the first wireless PCell based on a first Physical Uplink Control Channel (“PUCCH”) transmission power, and the one or more second octets includes a second Type 2 PHR field to indicate the PHR value associated with the second wireless PCell based on a second PUCCH transmission power.
3. The one or more computer-readable media of claim 2 , wherein the one or more first octets includes a first Type 1 PHR field to indicate the PHR value associated with the first wireless PCell based on a first Physical Uplink Shared Channel (“PUSCH”) transmission power, and the one or more second octets includes a Type 1 PHR field to indicate the PHR value associated with the second wireless PCell based on a second PUSCH transmission power.
4. The one or more computer-readable media of claim 1 , wherein the one or more first octets includes a first P CMAX,c field to indicate a maximum output power of the first wireless PCell, and the one or more second octets includes a second P CMAX,c field to indicate a maximum output power of the second wireless PCell.
5. The one or more computer-readable media of claim 1 , wherein the instructions are further to cause the UE to monitor more than one periodic PHR timer to identify a time for transmission of the MAC control element.
6. An apparatus to be included in an evolved Node B (“eNB”), the apparatus comprising:
transmitter circuitry; and
processor circuitry coupled to the transmitter circuitry, the processor circuitry to:
determine at least one duration that corresponds to at least one of more than one periodic power headroom (“PHR”) timers to be used by a user equipment (“UE”) to identify a time for transmission of PHR information for dual connectivity; and
cause the transmitter circuitry to transmit a signal to the UE, the signal including at least one value based on the at least one duration;
responsive to transmission of the signal, identify a received communication including a media access control (“MAC”) control element, wherein the MAC control element includes:
one or more first octets associated with a master cell group that corresponds to the eNB, the one or more first octets to include a PHR value associated with a first wireless primary cell (“PCell”) of the master cell group; and
one or more second octets associated with a secondary cell group that corresponds to a remote eNB, the one or more second octets to include a PHR value associated with a second wireless PCell of the secondary cell group.
7. The apparatus of claim 6 , wherein the one or more first octets includes a first Type 2 PHR field to indicate the PHR value associated with the first wireless PCell based on a first Physical Uplink Control Channel (“PUCCH”) transmission power, and the one or more second octets includes a second Type 2 PHR field to indicate the PHR value associated with the second wireless PCell based on a second PUCCH transmission power.
8. The apparatus of claim 7 , wherein the one or more first octets includes a first Type 1 PHR field to indicate the PHR value associated with the first wireless PCell based on a first Physical Uplink Shared Channel (“PUSCH”) transmission power, and the one or more second octets includes a Type 1 PHR field to indicate the PHR value associated with the second wireless PCell based on a second PUSCH transmission power.
9. The apparatus claim 7 , wherein the one or more first octets includes a first P CMAX,c field to indicate a maximum output power of the first wireless PCell, and the one or more second octets includes a second P CMAX,c field to indicate a maximum output power of the second wireless PCell.
10. The apparatus of claim 6 , the processor circuitry to cause the transmitter circuitry to transmit at least one of the PHR values to the remote eNB via an X2 interface.
11. The apparatus of claim 6 , the processor circuitry to determine at least one pathloss threshold value that corresponds to said at least one of said more than one periodic PHR timers, wherein the signal includes the at least one pathloss threshold value.
12. The apparatus of claim 6 , the processor circuitry to generate an information element to control the transmission of the PHR information, to cause the transmitter circuitry to transmit the signal responsive to generation of the information element.
13. The apparatus of claim 12 , wherein the information element comprises a MAC-MainConfig information element including a periodic PHR timer field associated with the master cell group, a PHR timer field associated with the secondary cell group, a prohibit timer field associated with the master cell group, and a prohibit timer field associated with the secondary cell group.
14. The apparatus of claim 13 , wherein the information element includes a master cell group pathloss change field and a secondary cell group pathloss change field.
15. An apparatus to be included in a user equipment (“UE”), the apparatus comprising:
transmitter circuitry; and
processor circuitry coupled to the transmitter circuitry, the processor circuitry to simultaneously operate on a first wireless primary cell (“PCell”), provided by a first eNB of a master cell group, and a second wireless PCell, provided by a second eNB of a secondary cell group, and to compute a power headroom (“PHR”) value associated with the first wireless PCell and a PHR value associated with the second wireless PCell;
the processor circuitry to generate a media access control (“MAC”) control element, wherein the MAC control element includes:
one or more first octets to include the PHR value associated with the first wireless PCell; and
one or more second octets to include the PHR value associated with the second wireless PCell; and
the processor circuitry to cause the transmitter circuitry to transmit the MAC control element to at least one of the eNBs.
16. The apparatus of claim 15 , wherein the one or more first octets includes a first Type 2 PHR field to indicate the PHR value associated with the first wireless PCell based on a first Physical Uplink Control Channel (“PUCCH”) transmission power, and the one or more second octets includes a second Type 2 PHR field to indicate the PHR value associated with the second wireless PCell based on a second PUCCH transmission power.
17. The apparatus of claim 16 , wherein the one or more first octets includes a first Type 1 PHR field to indicate the PHR value associated with the first wireless PCell based on a first Physical Uplink Shared Channel (“PUSCH”) transmission power, and the one or more second octets includes a Type 1 PHR field to indicate the PHR value associated with the second wireless PCell based on a second PUSCH transmission power.
18. The apparatus of claim 15 , wherein the one or more first octets includes a first P CMAX,c field to indicate a maximum output power of the first wireless PCell, and the one or more second octets includes a second P CMAX,c field to indicate a maximum output power of the second wireless PCell.
19. The apparatus of claim 15 , the processor circuitry to monitor more than one periodic PHR timer to identify a time for transmission of the MAC control element.
20. The apparatus of claim 15 , the processor circuitry to cause the transmitter circuitry to transmit the MAC control element to the first eNB.
21. The apparatus of claim 15 , the processor circuitry to cause the transmitter circuitry to transmit the MAC control element to the second eNB.
22. One or more non-transitory computer-readable media comprising compute device-executable instructions, wherein the instructions, in response to execution by a processor, cause the processor to:
determine at least one duration that corresponds to at least one of more than one periodic power headroom (“PHR”) timers to be used by a user equipment (“UE”) to identify a time for transmission of PHR information for dual connectivity; and
cause transmitter circuitry to transmit a signal to the UE, the signal including at least one value based on the at least one duration;
responsive to transmission of the signal, identify a received communication including a media access control (“MAC”) control element, wherein the MAC control element includes:
one or more first octets associated with a master cell group that corresponds to a first evolved Node B (“eNB”), the one or more first octets to include a PHR value associated with a first wireless primary cell (“PCell”) of the master cell group; and
one or more second octets associated with a secondary cell group that corresponds to a second different eNB, the one or more second octets to include a PHR value associated with a second wireless PCell of the secondary cell group.
23. The one or more computer-readable media of claim 22 , wherein the one or more first octets includes a first Type 2 PHR field to indicate the PHR value associated with the first wireless PCell based on a first Physical Uplink Control Channel (“PUCCH”) transmission power, and the one or more second octets includes a second Type 2 PHR field to indicate the PHR value associated with the second wireless PCell based on a second PUCCH transmission power.
24. The one or more computer-readable media of claim 23 , wherein the one or more first octets includes a first Type 1 PHR field to indicate the PHR value associated with the first wireless PCell based on a first Physical Uplink Shared Channel (“PUSCH”) transmission power, and the one or more second octets includes a Type 1 PHR field to indicate the PHR value associated with the second wireless PCell based on a second PUSCH transmission power.
25. The one or more computer-readable media of claim 23 , wherein the one or more first octets includes a first P CMAX,c field to indicate a maximum output power of the first wireless PCell, and the one or more second octets includes a second P CMAX,c field to indicate a maximum output power of the second wireless PCell.
26. The one or more non-transitory computer-readable media of claim 22 , wherein the instructions are further cause the processor to transmit at least one of the PHR values from the first eNB to the second eNB via an X2 interface.
27. One or more non-transitory computer-readable media comprising compute device-executable instructions, wherein the instructions, in response to execution by a user equipment (“UE”), cause the UE to:
generate a media access control (“MAC”) control element associated with power headroom (“PHR”) information for dual connectivity, wherein the MAC control element includes PHR values for a plurality of wireless primary cells (“PCells”), and wherein the MAC control element further includes:
one or more first octets associated with a master cell group, wherein the one or more first octets includes one of the PHR values associated with a first wireless PCell of the plurality of wireless PCells; and
one or more second octets associated with a secondary cell group, wherein the one or more second octets includes one of the PHR values associated with a second wireless PCell of the plurality of wireless PCells; and
cause transmitter circuitry of the UE to transmit the MAC control element including said PHR values to one or more evolved Node Bs.