Signaling to request increased transmission power limit in an emergency

A method of wireless communication by a user equipment (UE), comprising:

• transmitting a message to a base station, wherein the message includes a status of the UE, a buffer status report and a device-to-device (D2D) group index, wherein the D2D group index is associated with a D2D group identifier and a value of the D2D group index corresponds to a position of the D2D group identifier included in a direct communication indication message transmitted by the UE, and wherein the D2D group identifier is associated with a D2D group with which the UE intends to communicate based on the status of the UE;
• receiving, by the UE, a downlink control information (DCI) message from the base station based on the status, wherein the DCI message includes transmit power control information for D2D communications, and wherein the transmit power control information indicates whether the UE can transmit at an allowed transmit power;
• and
• transmitting data based on the transmit power control information received in the DCI message.

An apparatus for wireless communication, comprising:

• means for transmitting a message to a base station, wherein the message includes an emergency status of the apparatus the indicates whether the apparatus is in an emergency situation, at least one device-to-device (D2D) group, and a requested transmit power to be used for transmitting data from the apparatus to the at least one D2D group when the apparatus is in the emergency situation;
• means for receiving a downlink control information (DCI) message from the base station based on the status, wherein the DCI message includes transmit power control information for D2D communications, wherein the transmit power control information indicates whether the apparatus can transmit at an allowed transmit power, and wherein the allowed transmit power comprises one of the requested transmit power or a transmit power that is lower than the requested transmit power or lower than a maximum transmission power of the apparatus;
• and
• means for transmitting the data to the at least one D2D group based on the transmit power control information received in the DCI message.

An apparatus for wireless communication, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• transmit a message to a base station, wherein the message includes an emergency status of the apparatus that indicates whether the apparatus is in an emergency situation, at least one device-to-device (D2D) group, and a requested transmit power to be used for transmitting data from the apparatus to the at least one D2D group when the apparatus is in the emergency situation;
• receive a downlink control information (DCI) message from the base station based on the status, wherein the DCI message includes transmit power control information for D2D communications, wherein the transmit power control information indicates whether the apparatus can transmit at an allowed transmit power, and wherein the allowed transmit power comprises one of the requested transmit power or a transmit power that is lower than the requested transmit power or lower than a maximum transmission power of the apparatus;
• and
• transmit the data to the at least one D2D group based on the transmit power control information received in the DCI message.

An apparatus for wireless communication, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• transmit a message to a base station, wherein the message includes a status of the apparatus, a buffer status report and a D2D group index, wherein the D2D group index is associated with a D2D group identifier and a value of the D2D group index corresponds to a position of the D2D group identifier included in a direct communication indication message transmitted by the apparatus, and wherein the D2D group identifier is associated with a D2D group with which the apparatus intends to communicate based on the status of the apparatus;
• receive, by the apparatus, a downlink control information (DCI) message from the base station based on the status, wherein the DCI message includes transmit power control information for device-to-device (D2D) communications, and wherein the transmit power control information indicates whether the apparatus can transmit at an allowed transmit power;
• and
• transmit data based on the transmit power control information received in the DCI message.

A non-transitory computer-readable medium of a user equipment (UE) storing computer executable code for wireless communication, comprising code for:

• transmitting a message to a base station, wherein the message includes an emergency status of the UE that indicates whether the UE is in an emergency situation, at least one device-to-device (D2D) group, and a requested transmit power to be used for transmitting data from the UE to at least one D2D group when the UE is in the emergency situation;
• receiving a downlink control information (DCI) message from the base station based on the status, wherein the DCI message includes transmit power control information for device-to-device (D2D) communications, wherein the transmit power control information indicates whether the UE can transmit at an allowed transmit power, and wherein the allowed transmit power comprises one of the requested transmit power or a transmit power that is lower than the requested transmit power or lower than a maximum transmission power of the UE;
• and
• transmitting the data to the at least one D2D group based on the transmit power control information received in the DCI message.