Transmission power in a multicarrier wireless device

• US 8,599,785 B1
• Filed: 08/06/2013
• Issued: 12/03/2013
• Est. Priority Date: 01/25/2012
• 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): Rutkowski, Jeffrey M
• Assistant Examiner(s): FAYED, RASHA K
• Application Number:
  US13/960,729
• Publication Number:
  US 20130322383A1
• Time in Patent Office: 119 Days
• Field of Search: 370328-330, 370/338, 370341-342, 370/437, 370/441, 455/422.5, 455/425, 455/464
• US Class Current: 370/329
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/27 between access points
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/085 collision avoidance

Abstract

A wireless device receives a command for transmission of a random access preamble on a first cell. The wireless device transmits the random access preamble in parallel with a first packet and/or at least one second packet. If a total calculated transmission power exceeds a predefined value, the wireless device adjusts transmission power of one or more of the at least one parallel uplink transmission considering a higher priority for the transmission power of the random access preamble.

Claims

1. A method for use in a wireless device, the method comprising:

a) receiving at least one message causing configuration of;

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

ii) a plurality of cell groups comprising a primary cell group and a secondary cell group;

b) receiving a command causing transmission of a random access preamble on a secondary cell, said random access preamble transmitted in parallel with at least one of the following uplink transmissions;

i) a first packet on a control channel of said primary cell; and

ii) at least one second packet on at least one data channel of said plurality of cells;

c) determining a transmission power for said random access preamble; and

d) when a total calculated transmission power exceeds a predefined value, adjusting transmission power of one or more of said at least one uplink transmission according to a predefined rule considering a higher priority for said transmission power compared with a transmission power priority of said first packet and said at least one second packet.

2. The method of claim 1, wherein said at least one message further causes in said wireless device configuration of a plurality of channel parameters for the following channels:

a) said control channel on said primary cell;

b) said at least one data channel; and

c) a random access channel on said secondary cell.

3. The method of claim 1, wherein said adjusting transmission power comprises scaling a transmission power by a scaling factor:

a) greater than or equal to zero; and

b) smaller than or equal to one.

4. The method of claim 1, wherein said total calculated transmission power is calculated for a subframe.

5. The method of claim 1, wherein calculation of said total calculated transmission power comprises adding all of the following transmission powers:

a) a transmission power of said random access preamble;

b) a transmission power of said first packet if said first packet is transmitted; and

c) a transmission power of said at least one second packet if said at least one second packet is transmitted.

6. The method of claim 5, wherein if said at least one uplink transmission consists of said first packet, a calculated transmission power of said first packet is equal to a minimum of:

a) said transmission power of said first packet; and

b) said predefined value minus said transmission power of said random access preamble.

7. The method of claim 5, wherein if said at least one parallel uplink transmission consists of said first packet and said at least one second packet, then:

a) a calculated transmission power of said first packet is equal to a minimum of;

i) said transmission power of said first packet; and

ii) said predefined value minus said linear transmission power of said random access preamble; and

b) a calculated transmission power for each of said at least one second packet is calculated by scaling said transmission power of each of said at least one second packet by a scaling factor such that said total calculated transmission power is equal to or less than said predefined value, said scaling factor being equal to or less than one.

8. 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;

i) to receive at least one message causing configuration of a plurality of cells grouped into a plurality of cell groups comprising a primary cell group and a secondary cell group;

ii) to receive a command causing transmission of a random access preamble on a first cell in said plurality of cells, said random access preamble transmitted in parallel with at least one of the following uplink transmissions;

(1) a first packet on a control channel; and

(2) at least one second packet on at least one data channel;

iii) to determine a transmission power for said random access preamble; and

iv) when a total calculated transmission power exceeds a predefined value, to adjust transmission power of one or more of said at least one uplink transmission according to a predefined rule considering a higher priority for said transmission power compared with a transmission power priority of said first packet and said at least one second packet.

9. The wireless device of claim 8, wherein calculation of said total calculated transmission power comprises adding all of the following transmission powers:

a) a transmission power of said random access preamble;

b) a transmission power of said first packet if said first packet is transmitted; and

c) a transmission power of said at least one second packet if said at least one second packet is transmitted.

10. The wireless device of claim 9, wherein if said at least one uplink transmission consists of said first packet, a calculated transmission power of said first packet is equal to a minimum of:

a) said transmission power of said first packet; and

b) said predefined value minus said transmission power of said random access preamble.

11. The wireless device of claim 9, wherein if said at least one parallel uplink transmission consists of said at least one second packet, a calculated transmission power for each of said at least one second packet is calculated by scaling said transmission power of each of said at least one second packet by a scaling factor such that said total calculated transmission power is equal to or less than said predefined value, said scaling factor being equal to or less than one.

12. The wireless device of claim 8, wherein said adjustment of transmission power is performed over a period of one subframe.

13. The wireless device of claim 8, wherein said predefined value is a configured maximum transmission power of said wireless device.

14. The wireless device of claim 8, wherein said first cell is a primary cell.

15. The wireless device of claim 8, wherein:

a) said first packet is a physical uplink control channel packet; and

b) said at least one second packet is at least one physical uplink shared channel packet.

16. The wireless device of claim 8, wherein said first cell is in a cell group different from one or more cell groups employed for transmission of said first packet and said at least one second packet.

17. 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;

i) to receive at least one message causing configuration of;

(1) a plurality of cells comprising a primary cell and at least one secondary cell; and

(2) a plurality of cell groups comprising a primary cell group and a secondary cell group;

ii) to receive a command causing transmission of a random access preamble on a secondary cell, said random access preamble transmitted in parallel with at least one of the following uplink transmissions;

(1) a first packet on a control channel of said primary cell; and

(2) at least one second packet on at least one data channel of said plurality of cells;

iii) to determine a transmission power for said random access preamble; and

iv) when a total calculated transmission power exceeds a predefined value, to adjust transmission power of one or more of said at least one uplink transmission according to a predefined rule considering a higher priority for said transmission power compared with a transmission power priority of said first packet and said at least one second packet.

18. The wireless device of claim 17, wherein a configured sounding reference signal transmission is dropped if said total calculated transmission power exceeds a predefined value.

19. The wireless device of claim 17, wherein a transmission period of said random access preamble is more than one subframe.

20. The wireless device of claim 17, wherein a transmission period of said random access preamble overlaps a first subframe and a second subframe.