ADAPTATIONS OF DUAL CONNECTIVITY OPERATION TO UE CAPABILITY
A user equipment (UE) is configured by a Master enhanced NodeB (MeNB) for operation with dual connectivity to a Secondary eNB (SeNB) to transmit acknowledgement information when the UE is power limited and for a respective eNB to determine a UE power limitation. The UE, the MeNB, and the SeNB adjust operation according to a partitioning of a UE capability between the MeNB and the SeNB. The UE capability can be a transmission power, a soft buffer size, a reception or a transmission of a number of data transport block bits, or a number of decoding operations.
1 . A method for partitioning a transmission power, the method comprising:
determining, by a user equipment (UE) communicating with a first base station (MeNB) and with a second base station (SeNB),
a total power {circumflex over (P)} MeNB _ nominal (i 1 ) for transmissions to the MeNB in a subframe (SF) i 1 that overlaps with SF i 1 −1 and SF i 2 for transmissions to the SeNB, and
an absence of transmissions to the SeNB in SF i 2 ; and
transmitting, by the UE, to the MeNB with a total power {circumflex over (P)} MeNB _ Tx (i 1 ) determined as {circumflex over (P)} MeNB _ Tx (i 1 )=min ({circumflex over (P)} MeNB _ nominal (i 1 ),{circumflex over (P)} CMAX (i 1 ,i 2 −1)−{circumflex over (P)} SeNB _ Tx (i 2 − 1 )), where min (x,y) is the minimum function that results the smaller of two numbers x, y, {circumflex over (P)} CMAX (i 1 , i 2 −1) is a maximum transmission power, and {circumflex over (P)} SeNB _ Tx (i 2 −1) is a total transmission power to SeNB in SF i 2 −1.
2 . The method of claim 1 , wherein, when the UE transmits a random access preamble to the MeNB in SF i 1 or to the SeNB in SF i 2 −1, the UE first allocates a power to the transmission of the random access preamble and the power is subtracted from {circumflex over (P)} CMAX (i 1 , i 2 −1).
3 . The method of claim 1 , wherein the UE is configured with:
two sets of SFs that do not include common SFs,
a first minimum power available for transmissions to the MeNB in a SF from the first SF set and a second minimum power available for transmissions to the MeNB in a SF from the second SF set, and
a first minimum power available for transmissions to the SeNB in an SF from the first SF set and a second minimum power available for transmissions to the SeNB in an SF from the second SF set.
4 . A method for partitioning decoding operations for control channels, the method comprising:
receiving, by a user equipment (UE) from a base station:
a configuration for a set of cells, and
a configuration for a number of decoding operations for control channels scheduling transmissions in a subframe on a cell from the set of cells, wherein:
a decoding operation is over either first resources or second resources for transmissions of control channels, and
the configuration is applicable only for decoding operations over first resources and a number of decoding operations over second resources is predetermined.
5 . The method of claim 4 , wherein:
a control channel includes either a first downlink control information (DCI) format or a second DCI format, and
the configuration for the number of decoding operations is separate for the first DCI format and for the second DCI format.
6 . The method of claim 4 , wherein the configuration for the number of decoding operations is separate for a first SF and for a second SF from a set of SFs.
7 . The method of claim 4 , wherein the first resources are UE-specific and the second resources are UE-common.
8 . The method of claim 4 , wherein the UE informs the base station of a capability for a total number of the number of decoding operations in a SF.
9 . A method for partitioning a soft buffer, the method comprising:
transmitting, by a user equipment (UE) to a base station, a soft buffer capacity, and
receiving, by the UE from the base station:
a configuration for a set of cells, and
a configuration for a partition of the soft buffer capacity among cells from the set of cells.
10 . The method of claim 9 , wherein the base station configures the UE for a maximum number of hybrid automatic repeat request (HARQ) processes per cell from the set of cells.
11 . A User Equipment (UE), comprising:
a processor configured to determine
a total power {circumflex over (P)} MeNB _ nominal (i 1 ) for first transmissions in a subframe (SF) i 1 that overlaps with SF i 1 −1 and SF i 2 for second transmissions, and
an absence of second transmissions in SF i 2 ; and
a transmitter configured to transmit the first transmissions with a total power {circumflex over (P)} MeNB _ Tx (i 1 ) determined as {circumflex over (P)} MeNB _ Tx (i 1 )=min ({circumflex over (P)} MeNB _ nominal (i 1 ),{circumflex over (P)} CMAX (i 1 , i 2 −1)−{circumflex over (P)} SeNB _ Tx (i 2 −1)), where min (x,y) is the minimum function that results the smaller of two numbers x,y, {circumflex over (P)} CMAX (i 1 ,i 2 −1) is a maximum transmission power, and {circumflex over (P)} SeNB _ Tx (i 2 −1) is a total transmission power to SeNB in SF i 2 −1.
12 . The UE of claim 11 , wherein the processor further determines:
a power for a random access preamble in the first transmissions in SF i, or in the second transmissions in SF i 2 −1, and
an adjustment to P CMAX (i 1 , i 2 −1) after subtracting the power.
13 . A User Equipment (UE), comprising:
a receiver configured to receive:
a configuration for a set of cells, and
a configuration for a number of decoding operations for control channels scheduling transmissions in a subframe on a cell from the set of cells, wherein:
a decoding operation is over either first resources or second resources for transmissions of control channels, and
the configuration is applicable only for decoding operations over first resources and a number of decoding operations over second resources is predetermined; and
a decoder configured to decode control channels based on the configured number of decoding operations over the first resources and based on the predetermined number of decoding operations over the second resources.
14 . The UE of claim 13 , wherein:
the control channels include either a first downlink control information (DCI) format or a second DCI format, and
the configuration for the number of decoding operations is separate for the first DCI format and for the second DCI format.
15 . A base station, comprising:
a transmitter configured to transmit:
a configuration for a set of cells, and
a configuration for a number of decoding operations for control channels scheduling transmissions in a subframe on a cell from the set of cells, wherein:
a decoding operation is over either first resources or second resources for transmissions of control channels, and
the configuration is applicable only for decoding operations over first resources and a number of decoding operations over second resources is predetermined; and
an encoder configured to encode control channels for transmission over the first resources or over the second resources.
16 . The base station of claim 15 , wherein:
the control channels include either a first downlink control information (DCI) format or a second DCI format, and
the configuration for the number of decoding operations is separate for the first DCI format and for the second DCI format.
17 . A User Equipment (UE), comprising:
a transmitter configured to transmit information for a soft buffer capacity; and
a receiver configured to receive:
a configuration for a set of cells, and
a configuration for a partition of the soft buffer capacity among cells from the set of cells.
18 . The UE of claim 17 , wherein the receiver is further configured to receive a configuration for a maximum number of hybrid automatic repeat request (HARQ) processes per cell from the set of cells.
19 . A base station, comprising:
a receiver configured to receive information for a soft buffer capacity; and
a transmitter configured to transmit:
a configuration for a set of cells, and
a configuration for a partition of the soft buffer capacity among cells from the set of cells.
20 . The base station of claim 19 , wherein the transmitter is further configured to transmit a configuration for a maximum number of hybrid automatic repeat request (HARQ) processes per cell from the set of cells.