Managing Sounding Reference Signals in a Wireless Device

• US 20160100432A1
• Filed: 12/11/2015
• Published: 04/07/2016
• Est. Priority Date: 01/25/2012
• Status: Active Grant

• Current Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Original Assignee: Ofinno Technologies, LLC
• Inventors: Dinan, Esmael Hejazi
• Granted Patent: US 9,648,643 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 receives a control message comprising configuration parameters of a plurality of cells grouped into a plurality of cell groups. The wireless device transmits a first sounding reference signal (SRS) in a first cell group overlapping in time with transmission of a first random access preamble in a second cell group. Transmission of a second SRS in the first cell group is dropped if: the second SRS transmission and a second random access preamble transmission in the second cell group overlap in time and the wireless device has insufficient transmission power.

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 control message comprising configuration parameters of a plurality of cells grouped into a plurality of cell groups comprising a first cell group and a second cell group;

transmit a first sounding reference signal (SRS) in the first cell group overlapping in time with transmission of a first random access preamble in the second cell group, the wireless device having sufficient transmission power to transmit the first SRS and the first random access preamble; and

drop transmission of a second SRS in the first cell group if;

a configured transmission of the second SRS and a second random access preamble transmission in the second cell group overlap in time; and

the wireless device has insufficient transmission power to transmit the second SRS in parallel with the second random access preamble.

2. The wireless device of claim 1, wherein the first random access preamble is transmitted in the second cell group different from the first cell group.

3. The wireless device of claim 1, wherein the wireless device assigns a lower priority to an SRS transmission power compared to a priority of a transmission power of a random access preamble.

4. The wireless device of claim 1, wherein transmission of a third SRS is dropped if:

the third SRS transmission and a third random access preamble transmission overlap in time; and

the third SRS configured to be transmitted in the same cell group employed for transmission of the third random access preamble.

5. The wireless device of claim 1, wherein the wireless device assigns a lower priority to an SRS transmission power compared to:

a priority of a transmission power of a random access preamble; and

a priority of a transmission power of an uplink data packet.

6. The wireless device of claim 1, wherein transmission of the first SRS and an uplink data packet in a second cell in the first cell group overlap in time, the second cell being different from a first cell on which the first SRS is transmitted.

7. The wireless device of claim 1, wherein transmission of the first SRS and an uplink control packet in a second cell in the first cell group overlap in time, the second cell being different from a first cell on which the first SRS is transmitted.

8. The wireless device of claim 1, wherein the first SRS is transmitted on a last symbol of a subframe.

9. The wireless device of claim 1, wherein the wireless device transmits in parallel:

the first SRS on a first cell in the first cell group;

the first random access preamble in the second cell group different from the first cell group;

an uplink data packet on a second cell in the first cell group, the second cell being different from the first cell.

10. The wireless device of claim 1, wherein no SRS is transmitted in a first subframe of the first cell group if the wireless device does not have sufficient transmission power to transmit all the SRSs configured for transmission in the first subframe of the first cell group.

11. A method comprising:

receiving at least one control message comprising configuration parameters of a plurality of cells grouped into a plurality of cell groups comprising a first cell group and a second cell group;

transmitting a first sounding reference signal (SRS) in the first cell group overlapping in time with transmission of a first random access preamble in the second cell group, the wireless device having sufficient transmission power to transmit the first SRS and the first random access preamble; and

dropping transmission of a second SRS in the first cell group if;

a configured transmission of the second SRS and a second random access preamble transmission in the second cell group overlap in time; and

the wireless device has insufficient transmission power to transmit the second SRS in parallel with the second random access preamble.

12. The method of claim 11, wherein the first random access preamble is transmitted in the second cell group different from the first cell group.

13. The method of claim 11, wherein the wireless device assigns a lower priority to an SRS transmission power compared to a priority of a transmission power of a random access preamble.

14. The method of claim 11, wherein transmission of a third SRS is dropped if:

the third SRS transmission and a third random access preamble transmission overlap in time; and

the third SRS is configured to be transmitted in the same cell group employed for transmission of the third random access preamble.

15. The method of claim 11, wherein the wireless device assigns a lower priority to an SRS transmission power compared to:

a priority of a transmission power of a random access preamble; and

a priority of a transmission power of an uplink data packet.

16. The method of claim 11, wherein transmission of the first SRS and an uplink data packet in a second cell in the first cell group overlap in time, the second cell being different from a first cell on which the first SRS is transmitted.

17. The method of claim 11, wherein transmission of the first SRS and an uplink control packet in a second cell in the first cell group overlap in time, the second cell being different from a first cell on which the first SRS is transmitted.

18. The method of claim 11, wherein the first SRS is transmitted on a last symbol of a subframe.

19. The method of claim 11, wherein the wireless device transmits in parallel:

the first SRS on a first cell in the first cell group;

the first random access preamble in the second cell group different from the first cell group;

an uplink data packet on a second cell in the first cell group, the second cell being different from the first cell.

20. The method of claim 11, wherein no SRS is transmitted in a first subframe of the first cell group if the wireless device does not have sufficient transmission power to transmit all the SRSs configured for transmission in the first subframe of the first cell group.