Power control in a wireless device

• US 8,995,381 B2
• Filed: 04/14/2013
• Issued: 03/31/2015
• Est. Priority Date: 04/16/2012
• Status: Active Grant

• Current Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Original Assignee: Ofinno Technologies, LLC (Ofinno, LLC)
• Inventors: Dinan, Esmael Hejazi
• Primary Examiner(s): Choi, Eunsook
• Application Number:
  US13/862,430
• Publication Number:
  US 20130272233A1
• Time in Patent Office: 716 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0078 Timing of allocation
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A wireless device receives a control command to transmit a random access preamble on random access resources of a secondary cell in a secondary cell group. The wireless device receives a random access response providing an uplink grant to transmit an uplink packet. The wireless device computes the transmission power of the uplink packet employing, at least in part, a first parameter calculated by summation of: a power control value corresponding to a power control field in the uplink grant; and a total power ramp-up from the first transmission to the last transmission of the random access preamble.

Claims

1. A method comprising:

a) receiving, by a wireless device, at least one radio resource control message from a base station, said at least one radio resource control message to cause in said wireless device;

i) configuration of a plurality of cells comprising a primary cell and at least one secondary cell; and

ii) assignment of each of said at least one secondary cell to a cell group in a plurality of cell groups, said plurality of cell groups comprising;

(1) a primary cell group comprising a first subset of said plurality of cells, said first subset comprising said primary cell; and

(2) a secondary cell group comprising a second subset of said at least one secondary cell;

b) receiving, by said wireless device, a control command to transmit a random access preamble on random access resources of a secondary cell in said secondary cell group;

c) transmitting one or more times, by said wireless device, said random access preamble on said random access resources of said secondary cell;

d) receiving, by said wireless device, a random access response providing an uplink grant to transmit an uplink packet;

e) computing, by said wireless device, transmission power of said uplink packet employing, at least in part, a first parameter calculated by summation of;

i) a power control value corresponding to a power control field in said uplink grant; and

ii) a total power ramp-up from the first transmission to the last transmission of said random access preamble if said random access preamble is transmitted more than one time; and

f) transmitting, by said wireless device, said first uplink packet in radio resources identified by said first uplink grant.

2. The method of claim 1, wherein said random access response comprises a timing adjustment command.

3. The method of claim 2, further comprising applying, by said wireless device, said timing adjustment command to said secondary cell group.

4. The method of claim 1, further comprising said at least one radio resource control message causing configuration of at least one power control parameter of said secondary cell.

5. The method of claim 1, wherein said uplink grant comprises:

a) a radio resource allocation parameter;

b) said power control field; and

c) a modulation and coding index.

6. The method of claim 1, wherein said transmission power is computed employing the following parameters:

a) bandwidth of radio resources identified by said uplink grant;

b) a downlink pathloss estimate;

c) modulation and coding identified by said uplink grant; and

d) said first parameter.

7. The method of claim 1, wherein said control command comprises a preamble identifier of said random access preamble.

8. The method of claim 1, wherein said at least one radio resource control message causes configuration of said random access resources on said secondary cell.

9. The method of claim 1, wherein said wireless device retransmits said random access preamble if the following conditions are met:

a) no random access response is received in response to transmission of said random access preamble within a period of time; and

b) a maximum number of transmissions is not reached.

10. A method comprising:

a) receiving, by a wireless device, at least one radio resource control message from a base station, said at least one radio resource control message to cause in said wireless device assignment of each of at least one secondary cell in a plurality of cells to a cell group in a plurality of cell groups, said plurality of cell groups comprising a primary cell group and a secondary cell group;

b) receiving, by said wireless device, a control command to transmit a random access preamble on random access resources of a secondary cell in said secondary cell group;

c) transmitting one or more times, by said wireless device, said random access preamble on said random access resources of said secondary cell;

d) receiving, by said wireless device, a random access response providing an uplink grant to transmit an uplink packet;

e) computing, by said wireless device, transmission power of said uplink packet employing, at least in part, a first parameter calculated by summation of;

i) a power control value corresponding to a power control field in said uplink grant; and

ii) a total power ramp-up from the first transmission to the last transmission of said random access preamble if said random access preamble is transmitted more than one time; and

f) transmitting, by said wireless device, said first uplink packet in radio resources identified by said first uplink grant.

11. The method of claim 10, wherein said random access response comprises a timing adjustment command.

12. The method of claim 10, further comprising said at least one radio resource control message causing configuration of at least one power control parameter of said secondary cell.

13. The method of claim 10, wherein said uplink grant comprises:

a) a radio resource allocation parameter;

b) said power control field; and

c) a modulation and coding index.

14. The method of claim 10, wherein said transmission power is computed employing the following parameters:

a) bandwidth of radio resources identified by said uplink grant;

b) a downlink pathloss estimate;

c) modulation and coding identified by said uplink grant; and

d) said first parameter.

15. The method of claim 10, wherein said wireless device retransmits said random access preamble if the following conditions are met:

a) no random access response is received in response to transmission of said random access preamble within a period of time; and

b) a maximum number of transmissions is not reached.

16. A wireless device comprising:

a) one or more communication interfaces;

b) one or more processors; and

c) memory storing instructions that, when executed, cause said wireless device to;

i) receive at least one radio resource control message from a base station, said at least one radio resource control message to cause in said wireless device assignment of each of at least one secondary cell in a plurality of cells to a cell group in a plurality of cell groups, said plurality of cell groups comprising a primary cell group and a secondary cell group;

ii) receive a control command to transmit a random access preamble on random access resources of a secondary cell in said secondary cell group;

iii) transmit one or more times said random access preamble on said random access resources of said secondary cell;

iv) receiving, by said wireless device, a random access response providing an uplink grant to transmit an uplink packet;

v) compute transmission power of said uplink packet employing, at least in part, a first parameter calculated by summation of;

(1) a power control value corresponding to a power control field in said uplink grant; and

(2) a total power ramp-up from the first transmission to the last transmission of said random access preamble if said random access preamble is transmitted more than one time; and

vi) transmit said first uplink packet in radio resources identified by said first uplink grant.

17. The wireless device of claim 16, wherein said random access response comprises a timing adjustment command.

18. The wireless device of claim 16, wherein said control command comprises a preamble identifier of said random access preamble.

19. The wireless device of claim 16, wherein said at least one radio resource control message causes configuration of said random access resources on said secondary cell.

20. The wireless device of claim 16, wherein said wireless device retransmits said random access preamble if the following conditions are met:

a) no random access response is received in response to transmission of said random access preamble within a period of time; and

b) a maximum number of transmissions is not reached.