Multicarrier Signal Transmission in Wireless Communications

• US 20160057710A1
• Filed: 11/01/2015
• Published: 02/25/2016
• 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
• Granted Patent: US 9,743,431 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 transmits a random access preamble (RAP) on a first cell of a first cell group. If a configured transmission of an uplink transport block (UTB) or an uplink control information (UCI) on a second cell of a second cell group overlaps in time with transmission of the RAP, the wireless device adjusts transmission power of at least one of the UTB or the UCI. If a configured transmission of a sounding reference signal (SRS) on a third cell overlaps in time with transmission of the preamble, the wireless device drops the configured SRS transmission if a calculated total transmission power exceeds a first value.

Claims

1. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed, cause the wireless device to;

receive at least one message comprising configuration parameters of a plurality of cells being grouped into a plurality of cell groups;

transmit a random access preamble (RAP) on a first cell of a first cell group;

if a configured transmission of an uplink transport block (UTB) or an uplink control information (UCI) on a second cell of a second cell group overlaps in time with transmission of the RAP, adjust transmission power of at least one of the UTB or the UCI so that a total transmission power does not exceed a first power value; and

if a configured transmission of a sounding reference signal (SRS) on a third cell overlaps in time with transmission of the RAP, drop the configured SRS transmission if a calculated total transmission power exceeds the first power value.

2. The wireless device of claim 1, wherein adjustment of the transmission power of at least one of the UTB or the UCI comprises scaling the transmission power by a scaling factor that is greater than zero and smaller than or equal to one.

3. The wireless device of claim 1, wherein the calculated total transmission power is calculated for a subframe.

4. The wireless device of claim 1, wherein the SRS is a type zero SRS.

5. The wireless device of claim 1, wherein adjustment of the transmission power is performed over period of one subframe.

6. The wireless device of claim 1, wherein the first cell group is out-of-sync when the RAP is transmitted in the first cell group.

7. The wireless device of claim 1, wherein:

uplink transmission timing in the first cell group is derived employing a first reference cell in the first cell group; and

uplink transmission timing in the second cell group is derived employing a second reference cell in the second cell group.

8. The wireless device of claim 1, wherein the instructions further cause the wireless device to determine a transmission power for the RAP before transmitting the RAP.

9. The wireless device of claim 1, wherein the total calculated transmission power is calculated for a subframe and adjustment of the transmission power is performed over the period of one subframe.

10. The wireless device of claim 1, wherein if the configured transmission of the SRS on the third cell overlaps in time with transmission of the RAP, the instructions further cause the wireless device to transmit the configured SRS transmission if:

the calculated total transmission power does not exceed the first power value; and

the third cell is in-sync; and

the configured transmission of the SRS on the third cell does not overlap in time with transmission of other signals on the third cell.

11. A method comprising:

receiving, by a wireless device, at least one message comprising configuration parameters of a plurality of cells being grouped into a plurality of cell groups;

transmitting a random access preamble (RAP) on a first cell of a first cell group;

if a configured transmission of an uplink transport block (UTB) or an uplink control information (UCI) on a second cell of a second cell group overlaps in time with transmission of the RAP, adjusting transmission power of at least one of the UTB or the UCI so that a total transmission power does not exceed a first power value; and

if a configured transmission of a sounding reference signal (SRS) on a third cell overlaps in time with transmission of the RAP, dropping the configured SRS transmission if a calculated total transmission power exceeds the first power value.

12. The method of claim 11, wherein adjustment of the transmission power of at least one of the UTB or the UCI comprises scaling the transmission power by a scaling factor that is greater than zero and smaller than or equal to one.

13. The method of claim 11, wherein the calculated total transmission power is calculated for a subframe.

14. The method of claim 11, wherein the SRS is a type zero SRS.

15. The method of claim 11, wherein adjustment of the transmission power is performed over period of one subframe.

16. The method of claim 11, wherein the first cell group is out-of-sync when the RAP is transmitted in the first cell group.

17. The method of claim 11, wherein:

uplink transmission timing in the first cell group is derived employing a first reference cell in the first cell group; and

uplink transmission timing in the second cell group is derived employing a second reference cell in the second cell group.

18. The method of claim 11, further comprising determining a transmission power for the RAP before transmitting the RAP.

19. The method of claim 11, wherein the total calculated transmission power is calculated for a subframe and adjustment of the transmission power is performed over the period of one subframe.

20. The method of claim 11, wherein if the configured transmission of the SRS on the third cell overlaps in time with transmission of the RAP, further comprising transmitting the configured SRS transmission if:

the calculated total transmission power does not exceed the first power value; and

the third cell is in-sync; and

the configured transmission of the SRS on the third cell does not overlap in time with transmission of other signals on the third cell.