Power control method and user equipment in a system configured with serving cells having D2D sub-frames

1. A power control method, applicable to a system configured with serving cells, comprising:

A, calculating, by a user equipment (UE), transmission power required by each of the serving cells configured for the UE, wherein at least one of the serving cells is configured with device to device (D2D) sub-frames;

B, determining, by the UE, a channel or a signal that is possible to be transmitted in each of the serving cells and allocating transmission power for the channel or signal according to conditions of the serving cells configured for the UE and a relation between an amount of total transmission power required by all of the serving cells configured for the UE and an amount of maximum transmission power configured for the UE; and

C, transmitting, by the UE, the channel or signal of a serving cell according to the transmission power allocated to the channel or signal of the serving cell,

wherein the allocating the transmission power for the channel or signal comprises allocating the transmission power for the channel or signal according to a priority for allocating transmission power of the channel or signal of each of the serving cells, and

wherein the priority is determined based on whether the channel or signal is related to D2D service, cellular network communication service, public safety (PS) service, or non-public safety (N-PS) service.

2. The method of claim 1 , wherein the total transmission power required by all of the serving cells configured for the UE is a sum of transmission power required by channels or signals in an overlapping area in serving cells which overlap with each other.

3. The method of claim 2 , wherein the step B comprises:

allocating transmission power required by the channel or signal of each of the serving cells in the overlapping area according to a calculation result of the step A if the sum of transmission power required by channels or signals in the overlapping area is smaller than or equal to the maximum transmission power configured in the UE.

4. The method of claim 2 , wherein the step B comprises:

allocating transmission power required by at least two channels or signals that can be transmitted at the same time in the overlapping area according to a calculation result of the step A if the sum of transmission power required by channels or signals in the overlapping area is smaller than or equal to the maximum transmission power configured in the UE; and

allocating transmission power required by a channel or signal with high priority in the channels or signals that cannot be transmitted at the same time according to a calculation result of the step A, and allocating no transmission power to a channel or signal with low priority in the channels or signals that cannot be transmitted at the same time,

wherein the high priority and the low priority are determined according to the priority for allocating transmission power.

5. The method of claim 4 , wherein

allocating no transmission power to the channel or signal with the low priority in a sub-frame in the overlapping area if sub-frames of the serving cells are not aligned to each other and the channels or signals of the sub-frames cannot be transmitted at the same time.

6. The method of claim 4 , wherein whether the at least two channels or signals can be transmitted at the same time is determined according to Table 1:

TABLE 1

N-PS

N-PS

PUCCH  

PUSCH  

PRACH  

SRS

SS  

DS  

PS CCH

PS DCH

CCH

DCH

PUCCH  

Y/N/C  

PUSCH  

Y/N/C  

Y  

PRACH  

Y/N/C  

Y/N/C  

Y/N/C  

SRS  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

SS  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

DS  

Y/N/C

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

PS CCH  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

PS DCH  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y

N-PS

Y/N/C

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C

Y/N/C

Y/N/C  

Y/N/C  

CCH

N-PS

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y/N/C  

Y  

DCH  

the “Y” in Table 1 indicates two channels corresponding to the “Y” can be transmitted at the same time, the “N” in Table 1 indicates two channels corresponding to the “N” cannot be transmitted at the same time, the “C” in Table 1 indicates whether two channels corresponding to the “C” cannot be transmitted at the same time is configured by higher layer signaling, and the “Y/N/C” indicates 3 methods are applicable to two channels corresponding to the “Y/N/C”.

7. The method of claim 2 , wherein the step B comprises:

allocating transmission power to the channel or signal of each of the serving cells in the overlapping area according to the priority of the channel or signal if the sum of transmission power of the signals or channels in the overlapping area is larger than the maximum transmission power configured in the UE.

8. The method of claim 7 , wherein

allocating transmission power only to a channel or a signal in the overlapping area of a sub-frame according to the priority of the channel or signal of each of the serving cells if sub-frames of the serving cells are not aligned to each other; or allocating transmission power to a channel or signal in a sub-frame with the overlapping area according to the priority of the channel or signal of each of the serving cells.

9. The method of claim 1 , wherein

an order of signals and channels sorted in a descending order of the priorities for allocating transmission power is one of:

channels and signals of PS services, channels and signals of cellular network communication services, and channels and signals of N-PS services;

channels and signals of cellular network communication services, channels and signals of PS services, and channels and signals of N-PS services;

channels and signals of PS services, synchronization signal (SS) of N-PS services, discovery signal (DS) of N-PS services, channels and signals of cellular network communication services, control channel (CCH) of N-PS services, and data channel (DCH) of N-PS services;

SS of D2D services, DS of D2D services, channels and signals of cellular network communication services, CCH of D2D services, and DCH of D2D services;

SS of D2D services, DS of D2D services, CCH of PS services, DCH of PS services, channels and signals of cellular network communication services, CCH of N-PS services, and DCH of N-PS services;

SS of D2D services, CCH of PS services, DCH of PS services, channels and signals of cellular network communication services, DS of D2D services, CCH of N-PS services, and DCH of N-PS services;

SS of D2D services, DS of D2D services, channels and signals of cellular network communication services, CCH of PS services, DCH of PS services, CCH of N-PS services, and DCH of N-PS services;

SS of D2D services, channels and signals of cellular network communication services, CCH of PS services, DCH of PS services, DS of D2D services, CCH of N-PS services, and DCH of N-PS services;

channels and signals of cellular network communication services, SS of D2D services, DS of D2D services, CCH of PS services, DCH of PS services, CCH of N-PS services, and DCH of N-PS services;

channels and signals of cellular network communication services, SS of D2D services, CCH of PS services, DCH of PS services, DS of D2D services, CCH of N-PS services, and DCH of N-PS services;

channels and signals of cellular network communication services, SS of D2D services, DS of D2D services, CCH of broadcast services, DCH of broadcast services, CCH of groupcast services, DCH of groupcast services, CCH of unicast services, and DCH of unicast services;

SS of D2D services, DS of D2D services, channels and signals of cellular network communication services, DCH of broadcast services, CCH of broadcast services, DCH of groupcast services, CCH of groupcast services, CCH of unicast services, and DCH of unicast services;

SS of D2D services, DS of D2D services, CCH of broadcast services, DCH of broadcast services, CCH of groupcast services, DCH of groupcast services, channels and signals of cellular network communication services, CCH of unicast services, and DCH of unicast services;

channels and signals of cellular network communication services, SS of D2D services, CCH of broadcast services, DCH of broadcast services, CCH of groupcast services, DCH of groupcast services, DS of D2D services, CCH of unicast services, and DCH of unicast services;

SS of D2D services, channels and signals of cellular network communication services, CCH of broadcast services, DCH of broadcast services, CCH of groupcast services, DCH of groupcast services, DS of D2D services, CCH of unicast services, and DCH of unicast services;

SS of D2D services, CCH of broadcast services, DCH of broadcast services, CCH of groupcast services, DCH of groupcast services, channels and signals of cellular network communication services, DS of D2D services, CCH of unicast services, and DCH of unicast services;

channels and signals of cellular network communication services, and channels and signals of D2D services.

10. The method of claim 9 , wherein

signals and channels of PS services and N-PS services sorted in a descending order of priorities for allocating transmission power are: SS, DS, CCH, and DCH of one D2D service; and

signals and channels of cellular network communication services sorted in a descending order of priorities for allocating transmission power are: physical random access channel (PRACH), physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH) with uplink control information (UCI), PUSCH without UCI, and sounding reference signal (SRS).

11. The method of claim 7 , wherein

priority of D2D services is the same with the priority of physical uplink shared channel (PUSCH) without uplink control information (UCI) of cellular network communication services, and

wherein channels or signals of D2D services include D2D SS, and D2D DS and D2D communication signals.

12. The method of claim 11 , wherein the allocating transmission power to the signal or channel of each of the serving cells according to the priority of the signal or channel comprises:

allocating transmission power according to the descending order of the priorities, wherein transmission power is first allocated to a channel or signal having a high priority, remaining transmission power after allocation to the channel or signal having the highest priority is allocated to channels or signals having lower priorities than the highest priority; if the remaining transmission power is less than transmission power required by one or multiple channels or signals having a lower priority than the highest priority, proportionally reducing the transmission power required by the one or multiple channels or signals having the lower priority until the sum of all of allocated transmission power is smaller than or equal to the maximum transmission power configured in the UE;

wherein the proportionally reducing the transmission power required by the one or multiple channels or signals having the lower priority comprises:

for sub-frame i, proportionally adjusting, by the UE, transmission power of PUSCH without UCI and channels or signals of D2D services in serving cell c that have the same priority until the following condition is met:

∑

c

≠

j

,

c

≠

c

⁢

⁢

1

⁢

(

w

⁡

(

i

)

·

P

^

PUSCH

,

c

⁡

(

i

)

)

+

w

⁡

(

i

)

·

P

^

D

⁢

⁢

2

⁢

D

,

c

⁢

⁢

1

⁡

(

i

)

≤

(

P

^

CMAX

⁡

(

i

)

-

P

^

PUCCH

⁡

(

i

)

-

P

^

PUSCH

,

j

⁡

(

i

)

)

wherein the {circumflex over (P)} CMAX (i) is a linear value of the maximum transmission power P CMAX configured in the UE for sub-frame i;

{circumflex over (P)} PUCCH (i) is a linear value of the power of PUCCH P PUCCH (i);

{circumflex over (P)} PUCCH,j (i) is a linear value of the power of PUSCH with UCI P PUCCH,j (i) in serving cell j;

{circumflex over (P)} PUCCH,c (i) is a linear value of the power of PUSCH without UCI P PUCCH,c (i) in serving cell c;

w(i) is a power adjustment factor, and 0≤w(i)≤1; and

{circumflex over (P)} D2D,c1 (i) is a linear value of power of channels or signals of D2D services P D2D,c1 (i) in serving cell c1.

13. The method of claim 7 , wherein

priority of D2D DS and D2D communication signals is the same with the priority of physical uplink shared channel (PUSCH) without uplink control information (UCI) of cellular network communication services, the priority of D2D SS is higher than the priority of PUSCH without UCI of cellular network communication services, the priority of D2D SS is lower than the priority of PUSCH with UCI of cellular network communication services.

14. The method of claim 11 , wherein the allocating transmission power to the signal or channel of each of the serving cells according to the priority of the signal or channel comprises:

allocating transmission power according to the descending order of the priorities, wherein transmission power is first allocated to a channel or signal having a high priority, remaining transmission power after allocation to the channel or signal having the highest priority is allocated to channels or signals having lower priorities than the highest priority; if the remaining transmission power is less than transmission power required by one or multiple channels or signals having a lower priority than the highest priority, the transmission power required by the one or multiple channels or signals having the lower priority is reduced proportionally until the sum of all of allocated transmission power is smaller than or equal to the maximum transmission power configured in the UE;

wherein the proportionally reducing the transmission power required by the one or multiple channels or signals having the lower priority comprises:

for sub-frame i, allocating transmission power to D2D SS according to {circumflex over (P)} D2DSS (i)=Min(({circumflex over (P)} CMAX (i)−{circumflex over (P)} PUCCH (i)−{circumflex over (P)} PUSCH,j (i)), {circumflex over (P)} D2DSS (i)), and proportionally adjusting, by the UE, transmission power of PUSCH without UCI and D2D DS and D2D communication signals in serving cell c that have the same priority until the following condition is met:

∑

c

≠

j

,

c

≠

c

⁢

⁢

1

⁢

(

w

⁡

(

i

)

·

P

^

PUSCH

,

c

⁡

(

i

)

)

+

w

⁡

(

i

)

·

P

^

D

⁢

⁢

2

⁢

D

,

c

⁢

⁢

1

⁡

(

i

)

≤

(

P

^

CMAX

⁡

(

i

)

-

P

^

PUCCH

⁡

(

i

)

-

P

^

PUSCH

,

j

⁡

(

i

)

-

P

^

D

⁢

⁢

2

⁢

DSS

⁡

(

i

)

)

wherein the {circumflex over (P)} CMAX (i) is a linear value of the maximum transmission power P CMAX configured in the UE for sub-frame i;

{circumflex over (P)} PUCCH (i) is a linear value of the power of PUCCH P PUCCH in serving cell c;

{circumflex over (P)} PUSCH,j (i) is a linear value of the power of PUSCH with UCI P PUSCH,j (i) in serving cell j;

{circumflex over (P)} D2DSS (i) is a linear value of the power of D2D SS P D2DSS (i);

{circumflex over (P)} PUSCH,c (i) is a linear value of the power of PUSCH without UCI P PUSCH,c (i) in serving cell c;

w(i) is a power adjustment factor, and 0≤w(i)≤1; and

{circumflex over (P)} D2D,c1 (i) is a linear value of power of D2D DS and D2D communication channels P D2D,c1 (i) in serving cell c1.

15. The method of claim 7 , wherein the allocating transmission power to the signal or channel of each of the serving cells according to the priority of the signal or channel comprises:

allocating transmission power to signals and channels in the descending order of the priorities for allocating transmission power to the signals and channels, wherein transmission power is first allocated to a channel or a signal having the highest priority, the remaining transmission power is allocated to a channel or a signal having a lower priority than the highest priority after transmission power has been allocated to the channel or signal having highest priority, the process is repeated until all the transmission power has been allocated.

16. The method of claim 15 , further comprising:

allocating no power to a channel or signal having a first priority if there is no remaining power after transmission power is allocated to a channel or signal having a higher priority than the first priority;

allocating transmission power to one or multiple channels or signals having a third priority according to one of the following manners if the remaining power is less than transmission power required by the one or multiple channels or signals after transmission power is allocated to a signal or channel having a higher priority than the third priority:

proportionally reducing the transmission power of each of the one or multiple channels or signals that have the third priority until the sum of all of allocated transmission power is smaller than or equal to the maximum transmission power configured in the UE; or

allocating transmission power required by at least one channel or signal of the one or multiple channels or signals, and allocating no transmission power to other signals or channels of the one or multiple channels until the sum of all of allocated transmission power is smaller than or equal to the maximum transmission power configured in the UE; or

proportionally reducing the transmission power of at least one of the one or multiple channels or signals that have the third priority until the sum of all of allocated transmission power is smaller than or equal to the maximum transmission power configured in the UE.

17. The method of claim 16 , wherein the proportionally reducing the transmission power of at least one of the one or multiple channels or signals that have the third priority comprises:

proportionally reducing transmission power of a service channel for transmitting data among the one or multiple channels or signals;

proportionally reducing transmission power of a control channel for transmitting control signaling among the one or multiple channels or signals, or transmitting at least one of the one or multiple channels or signals while stopping transmitting the other of the one or multiple channels or signals;

transmitting at least one of reference signals among the one or multiple channels or signals while stopping transmitting the other reference signals.

18. The method of claim 16 , wherein the proportionally reducing the transmission power of each of the one or multiple channels or signals that have the third priority comprises:

in a sub-frame i, when the sum of transmission power required by channels or signals of all of serving cells configured for the UE is larger than the maximum transmission power configured in the UE, proportionally adjusting transmission power of channels or signals that have the same priority in serving cell c until the following condition is met:

∑

c

⁢

∑

l

⁢

(

w

c

,

l

⁡

(

i

)

·

P

^

c

,

l

⁡

(

i

)

≤

(

P

^

CMAX

⁡

(

i

)

-

P

allocated

)

wherein the {circumflex over (P)} CMAX (i) is a linear value of the maximum transmission power P CMAX (i) configured in the UE for sub-frame i;

{circumflex over (P)} c,l (i) is a linear value of power of a channel or signal 1 in serving cell c;

w c,l (i) is a power adjustment factor of the power of the channel or signal 1 in serving cell c, and 0≤w c,l (i)≤1;

P allocated is the power that has been allocated to channels or signals with priorities higher than the third priority;

({circumflex over (P)} CMAX (i)=P allocated ) is the remaining power after the power has been allocated to the channels or signals with priorities higher than the third priority.

19. The method of claim 7 , wherein the allocating transmission power to a signal or channel of each of the serving cells according to the priority of the signal or channel comprises:

proportionally reducing transmission power of all channels or signals until the sum of all of allocated transmission power is smaller than or equal to the maximum transmission power configured in the UE;

in a sub-frame i, when the sum of transmission power required by channels or signals of all of the serving cells configured for the UE is larger than the maximum transmission power configured in the UE, proportionally adjusting, by the UE, transmission power of all of the channels or signals in a serving cell c until the following condition is met:

ΣΣ(w c,l (i)·{circumflex over (P)} c,l (i)≤({circumflex over (P)} CMAX (i))

wherein the {circumflex over (P)} CMAX (i) is a linear value of the maximum transmission power P CMAX configured in the UE for sub-frame i;

{circumflex over (P)} c,l (i) is a linear value of power of a channel or signal 1 in serving cell c;

w c,l (i) is a power adjustment factor of the power of the channel or signal 1 in serving cell c, 0≤w c,l (i)≤1, and channels or signals having different priorities correspond to different w c,l (i).

20. The method of claim 2 , wherein the step B comprises:

adjusting transmission power of a channel or signal according to one of Tables 2-7 when the sum of transmission power required by channels or signals of all of the serving cells configured for the UE is larger than the maximum transmission power configured in the UE:

TABLE 2

SS

DS

CCH

DCH

PUCCH

2, 3, 4

2, 3, 4

1, 2, 3, 4

1, 2, 4

PUSCH

2, 3

2, 3

1, 2, 3

1, 2

PRACH

3, 4

3, 4

1, 3, 4

1, 4

SRS

3, 4

3, 4

1, 3, 4

1, 4

TABLE 3

SS  

DS  

PS CCH  

PS DCH  

PS CCH  

PS DCH  

PUCCH  

2, 3, 4

2, 3, 4  

1, 2, 3, 4

1, 2, 4

1, 2, 3, 4

1, 2, 4  

PUSCH  

2, 3  

2, 3  

1, 2, 3  

1, 2

1, 2, 3  

1, 2  

PRACH  

3, 4  

3, 4  

1, 3, 4  

1, 4  

1, 3, 4  

1, 4  

SRS  

3, 4  

3, 4  

1, 3, 4  

1, 4  

1, 3, 4  

1, 4  

TABLE 4

PS SS  

PS DS  

N-PS SS  

N-PS DS  

PS CCH

PS DCH

PS CCH

PS DCH

PUCCH  

2, 3, 4  

2, 3, 4  

2, 3, 4  

2, 3, 4  

1, 2, 3, 4  

1, 2, 4  

1, 2, 3, 4  

1, 2, 4

PUSCH  

2, 3  

2, 3  

2, 3  

2, 3  

1, 2, 3  

1, 2  

1, 2, 3

1, 2

PRACH  

3, 4  

3, 4

3, 4

3, 4

1, 3, 4  

1, 4  

1, 3, 4

1, 4  

SRS

3, 4

3, 4

3, 4

3, 4  

1, 3, 4  

1, 4  

1, 3, 4

1, 4

TABLE 5

Broadcast

Broadcast

Groupcast

Groupcast

Unicast

Unicast

SS  

DS

CCH  

DCH  

CCH  

DCH  

CCH

DCH

PUCCH  

2, 3, 4  

2, 3, 4  

1, 2, 3, 4

1, 2, 4  

1, 2, 3, 4  

1, 2, 4

1, 2, 3, 4  

1, 2, 4  

PUSCH  

2, 3  

2, 3  

1, 2, 3  

1, 2  

1, 2, 3

1, 2

1, 2, 3

1, 2

PRACH  

3, 4  

3, 4

1, 3, 4  

1, 4  

1, 3, 4  

1, 4  

1, 3, 4

1, 4  

SRS

3, 4  

3, 4

1, 3, 4

1, 4  

1, 3, 4  

1, 4  

1, 3, 4  

1, 4  

TABLE 6

PS

SS  

DS  

PS CCH  

DCH  

N-PS CCH  

N-PS DCH

SS  

3, 4  

DS  

3, 4  

3, 4  

PS CCH  

2, 3, 4  

2, 3, 4  

1, 2, 3, 4  

PS DCH  

2, 3  

2, 3  

1, 2, 3  

1, 2  

N-PS CCH  

2, 3, 4  

2, 3, 4  

1, 2, 3, 4  

1, 2, 4  

1, 2, 3, 4  

N-PS DCH  

2, 3  

2, 3  

1, 2, 3  

1, 2  

1, 2, 3  

1, 2

TABLE 7

Broadcast

Broadcast

Groupcast

Groupcast

Unicast

Unicast

SS  

DS  

CCH  

DCH  

CCH  

DCH  

CCH  

DCH

SS

3, 4

DS

3, 4

3, 4  

Broadcast

2, 3, 4  

2, 3, 4  

1, 2, 3, 4  

CCH

Broadcast

2, 3  

2, 3  

1, 2, 3  

1, 2  

DCH

Groupcast

2, 3, 4  

2, 3, 4  

1, 2, 3, 4  

1, 2, 4  

1, 2, 3, 4  

CCH

Groupcast

2, 3  

2, 3  

1, 2, 3  

1, 2  

1, 2, 3  

1, 2  

DCH

Unicast

2, 3, 4  

2, 3, 4

1, 2, 3, 4  

1, 2, 4  

1, 2, 3, 4  

1, 2, 4  

1, 2, 3, 4  

CCH

Unicast

2, 3  

2, 3  

1, 2, 3  

1, 2  

1, 2, 3  

1, 2  

1, 2, 3  

1, 2  

DCH

wherein, “1” indicates adjusting transmission power of a channel or signal in a column where “1” is located until the total transmission power of an overlapping area is smaller than or equal to;

“2” indicates adjusting transmission power of a channel or signal in a column where “2” is located until the total transmission power of an overlapping area is smaller than or equal to;

“3” indicates stopping transmission of a channel or signal in a column where “3” is located;

“4” indicates stopping transmission of a channel or signal in a row where “4” is located; and

“1,2,3” indicates two channels or signals corresponding to a row and a column where “1,2,3” is located can adopt a method corresponding to one of “1”, “2” and “3”.

21. A user equipment (UE) for power control in a system configured with serving cells, comprising: a power calculating module, a power allocating module and a transmitting module; wherein

the power calculating module is configured to calculate transmission power required by each of serving cells configured for the UE respectively, wherein at least one of the serving cells is configured with device to device (D2D) sub-frames;

the power allocating module is configured to determine a channel or a signal that is possible to be transmitted in each of the serving cells and allocate transmission power for each channel or signal determined according to conditions of the serving cells configured for the UE, a relation between an amount of the total transmission power required by all of the serving cells, and an amount of maximum transmission power configured in the UE; and

the transmitting module is configured to transmit the channel or signal of a serving cell according to the transmission power allocated to the channel or signal of the serving cell,

wherein the power allocating module is further configured to allocate the transmission power for the channel or signal according to a priority for allocating transmission power of the channel or signal of each of the serving cells, and

wherein the priority is determined based on whether the channel or signal is related to D2D service, cellular network communication service, public safety (PS) service, or non-public safety (N-PS) service.