Method, apparatus and computer program for power control related to random access procedures
DC
First Claim
Patent Images
1. A method comprising:
- using a processor to initialize for i=0 a first power control adjustment state g(i) for an uplink control channel and a second power control adjustment state f(i) for an uplink shared channel to each reflect an open loop power control error;
using the processor to compute an initial transmit power for the uplink shared channel using full path loss compensation, wherein the initial transmit power depends on a preamble power of a first message sent on an access channel and the second power control adjustment state f(0); and
sending from a transmitter a third message on the uplink shared channel at the initial transmit power;
wherein the second power control adjustment state f(i) for i=0 is initialized as;
P0—
UE—
PUSCH+f(0)=Δ
PPC+Δ
Prampup;
in which;
P0—
UE—
PUSCH is a power control constant for the uplink shared channel that is specific for a user equipment executing the method;
Δ
Prampup is a ramp-up power for preamble transmissions; and
Δ
PPC is a power control command indicated in a second message that is received in response to sending the first message.
4 Assignments
Litigations
5 Petitions
Accused Products
Abstract
A first power control adjustment state g(i) and a second power control adjustment state f(i) are initialized for i=0 to each reflect an open loop power control error. An initial transmit power for a shared uplink channel is computed using full pathloss compensation. The computed initial transmit power depends on a preamble power of a first message sent on an access channel, and the initial transmit power is initialized with the second power control adjustment state f(0). A third message is sent from a transmitter on an uplink shared channel at the initial transmit power. In various implementations, the power for i=0 on the uplink control channel is also initialized similar to the initial transmit power for the third message and using full pathloss compensation, and after the third message (and retransmissions of it), subsequent messages sent on the uplink shared channel are sent at a power that is computed using fractional pathloss compensation.
15 Citations
17 Claims
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1. A method comprising:
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using a processor to initialize for i=0 a first power control adjustment state g(i) for an uplink control channel and a second power control adjustment state f(i) for an uplink shared channel to each reflect an open loop power control error; using the processor to compute an initial transmit power for the uplink shared channel using full path loss compensation, wherein the initial transmit power depends on a preamble power of a first message sent on an access channel and the second power control adjustment state f(0); and sending from a transmitter a third message on the uplink shared channel at the initial transmit power; wherein the second power control adjustment state f(i) for i=0 is initialized as;
P0— UE— PUSCH+f(0)=Δ
PPC+Δ
Prampup;in which; P0 — UE— PUSCH is a power control constant for the uplink shared channel that is specific for a user equipment executing the method;Δ
Prampup is a ramp-up power for preamble transmissions; andΔ
PPC is a power control command indicated in a second message that is received in response to sending the first message.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
and after sending the third message, the method further comprises using the processor to compute an updated transmit power for the uplink shared channel using fractional power control and sending from the transmitter a subsequent message on the uplink shared channel using the updated transmit power.
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3. The method according to claim 1, wherein the first power control adjustment state g(i) for i=0 is initialized as:
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P0— UE— PUCCH+g(0)=Δ
PPC+Δ
Prampup;wherein;
PO— UE— PUCCH is a power control constant for the uplink control channel power that is specific for a user equipment executing the method.
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4. The method according to claim 3, wherein P0
— -
UE
— PUSCH=PO— UE— PUCCH=0 when computing initial values at i=0 of power control states for the respective shared and control channels.
-
UE
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5. The method according to claim 1,
wherein the initial transmit power PMsg3 of the third message for i=0 is equal to: -
PMsg3=min{Pmax,Ppreamble+Δ
0,preamble— Msg3+Δ
PC— Msg3+10 log10(MPUSCH(i))+Δ
TF(TF(i))};in which; PMAX is a maximum allowed transmission power; Ppreamble is the preamble power of the first message; MPUSCH(i) is determined from an uplink resource allocation of a second message received in response to sending the first message; Δ
TF(TF(i)) is calculated from received signaling;Δ
PC— Msg3 is indicated by a power control command received at the receiver; andΔ
0,preamble— Msg3 is an offset from the preamble power.
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6. A method according to claim 5, further comprising, after sending the third message, using the processor to compute an updated transmit power for the shared uplink channel using fractional power control and sending from the transmitter a subsequent message on the uplink shared channel using the updated transmit power, wherein the updated transmit power PPUSCH (i) is equal to:
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PPUSCH(i)=min{PMAX,10 log10(MPUSCH(i)+PO— PUSCH(j)+α
·
PL+Δ
TF(TF(i)+f(i)};wherein; PO — PUSCH (j) is calculated from received signaling,α
or an indication of α
is received in signaling, andPL is path loss that is estimated from received signaling.
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7. The method according to claim 6, wherein α
- =1 for the third message and for all retransmissions of the third message indicating full path loss compensation, and α
<
1 for messages after the third message and all retransmissions of the third message indicating fractional path loss compensation.
- =1 for the third message and for all retransmissions of the third message indicating full path loss compensation, and α
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8. The method according to claim 7, executed by a user equipment;
- and wherein the third message comprises an indication of a power difference between the initial transmit power which is computed using full path loss compensation and a fractional path loss computation of the initial transmit power.
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9. A computer readable memory storing a computer program that when executed by a processor results in actions comprising:
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initializing for i=0 a first power control adjustment state g(i) for an uplink control channel and a second accumulation power control adjustment state f(i) for an uplink shared channel to each reflect an open loop power control error; computing an initial transmit power for the uplink shared channel using full path loss compensation, wherein the initial transmit power depends on a preamble power of a first message sent on an access channel and the second power control adjustment state f(0); and outputting the initial transmit power for transmission of a third message on the uplink shared channel; wherein the second accumulation power control adjustment state f(i) for i=0 is initialized as;
P0— UE— PUSCH+f(0)=Δ
PPC+Δ
Prampup;in which; P0 — UE— PUSCH is a power control constant for the uplink shared channel that is specific for a user equipment which sends the first and third messages;Δ
Prampup is a ramp-up power for preamble transmissions; andΔ
PPC is a power control command indicated in a second message that is received in response to the first message.
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10. An apparatus comprising:
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a processor; and a memory storing a computer program; in which the processor is configured with the memory and the computer program to cause the apparatus to; initialize for i=0 a first power control adjustment state g(i) for an uplink control channel and a second accumulation power control adjustment state f(i) for an uplink shared channel to each reflect an open loop power control error, and compute an initial transmit power for the uplink shared channel using full path loss compensation, wherein the initial transmit power depends on a preamble power of a first message sent on an access channel and the second power control adjustment state f(0); and compile a third message to be sent on the uplink shared channel at the initial transmit power; wherein the second power control adjustment state f(i) for i=0 is initialized as;
P0— UE— PUSCH+f(0)=Δ
PPC+Δ
Prampup;in which; P0 — UE— PUSCH is a power control constant for the uplink shared channel that is specific for a user equipment;Δ
Prampup is a ramp-up power for preamble transmissions; andΔ
PPC is a power control command indicated in a second message received at a receiver of the apparatus in response to the transmitter sending the first message.- View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
wherein;
PO— UE— PUCCH is a power control constant for the uplink control channel that is specific for a user equipment.
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13. The apparatus according to claim 12, wherein P0
— -
UE
— PUSCH=PO— UE— PUCCH=0 when the processor computes initial values at i=0 of power control states for the respective shared and control channels.
-
UE
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14. The apparatus according to claim 10,
wherein the initial transmit power PMsg3 for i=0 is equal to: -
PMsg3=min{Pmax,Ppreamble+Δ
0,preamble— Msg3+Δ
PC— Msg3+10 log10(MPUSCH(i))+Δ
TF(TF(i))};in which; PMAX is a maximum allowed transmission power; Ppreamble is the preamble power of the first message; MPUSCH(i) is determined from an uplink resource allocation of a second message received in response to sending the first message; Δ
TF(TF(i)) is calculated from received signaling;Δ
PC— Msg3 is indicated by a power control command received at the receiver; andΔ
0,preamble— Msg3 is an offset from the preamble power.
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15. The apparatus according to claim 14, wherein the processor is configured with the memory and the computer program to compute an updated transmit power for the shared uplink channel using fractional power control and the transmitter is configured to send from the transmitter a subsequent message on the uplink shared channel using the updated transmit power, wherein the updated transmit power PPUSCH(i) is equal to:
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PPUSCH(i)=min{PMAX,10 log10(MPUSCH(i))+PO— PUSCH(j)+α
·
PL+Δ
TF(TF(i))+f(i)};wherein; PO — PUSCH (j) is calculated from received signaling,α
or an indication of α
is received in signaling, andPL is path loss that is estimated from received signaling.
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16. The apparatus according to claim 15, wherein α
- =1 for the third message and for all retransmissions of the third message indicating full path loss compensation, and α
<
1 for messages after the third message and all retransmissions of the third message indicating fractional path loss compensation.
- =1 for the third message and for all retransmissions of the third message indicating full path loss compensation, and α
-
17. The apparatus according to claim 15, in which the apparatus comprises a user equipment, and wherein the third message comprises an indication of a power difference between the initial transmit power which is computed using full path loss compensation and a fractional path loss computation of the initial transmit power.
Specification
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Litigation Data
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Current AssigneeVivo Mobile Communication Co., Ltd. (Vivo Communication Technology Co. Ltd.)
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Original AssigneeNokia Solutions and Networks US LLC (Nokia Corporation)
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InventorsLindholm, Jari, Korhonen, Juha S.
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Primary Examiner(s)Hammond, Crystal L
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Application NumberUS12/387,661Publication NumberTime in Patent Office1,393 DaysField of SearchNoneUS Class Current455/522CPC Class CodesH04W 52/10 Open loop power controlH04W 52/146 Uplink power controlH04W 52/16 Deriving transmission power...H04W 52/242 taking into account path lossH04W 52/50 at the moment of starting c...
