Sounding reference signal transmission

• US 8,547,929 B1
• Filed: 05/22/2013
• Issued: 10/01/2013
• 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:
  US13/899,725
• Publication Number:
  US 20130250897A1
• Time in Patent Office: 132 Days
• Field of Search: 370328-330, 370/338, 370341-342, 370/437, 370/441, 455/422.5, 455/425, 455/464
• US Class Current: 370/330
• 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 first sounding reference signal on a first cell of a first cell group in parallel with transmission of at least one of a first random access preamble in a second cell group, and a first uplink data packet on a second cell. The wireless device drops a second sounding reference signal in a symbol of the first cell if at least one of the following conditions is satisfied: a second random access preamble is transmitted overlapping the symbol in the first cell group, and a second uplink packet is transmitted overlapping the symbol in the first cell.

Claims

1. A method comprising:

a) receiving, by a wireless device, at least one control message from a base station, said at least one control message causing in said wireless device;

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

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

iii) configuration of transmissions of sounding reference signals (SRSs) on a first cell in said plurality of cells, said first cell being assigned to a first cell group in said plurality of cell groups, said SRSs comprising a first SRS and a second SRS;

b) transmitting, by said wireless device, said first SRS on said first cell in parallel with transmission of at least one of;

i) a first random access preamble in a second cell group different from said first cell group; and

ii) a first uplink data packet on a second cell different from said first cell; and

c) dropping, by said wireless device, said second SRS in a symbol of a subframe if at least one of the following conditions is satisfied;

i) a second random access preamble is transmitted overlapping said symbol in said first cell group;

ii) a second uplink data packet is transmitted overlapping said symbol in said first cell; and

iii) said wireless device has insufficient power to transmit said second SRS in parallel with other uplink transmissions in said plurality of cells.

2. The method of claim 1, wherein:

a) said first random access preamble is transmitted on a random access channel; and

b) said first uplink data packet is transmitted on a data channel.

3. The method of claim 1, wherein said first cell group is one of:

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

b) a secondary cell group comprising a second subset of said at least one secondary cell.

4. The method of claim 1, wherein said first cell group is out of sync when said second random access preamble is transmitted on said first cell group.

5. The method of claim 1, wherein said first uplink data packet is transmitted on said first cell group.

6. The method of claim 1, wherein said SRSs are type zero sounding reference signals.

7. The method of claim 1, wherein said SRSs are configured to be transmitted during a time period.

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

9. The method of claim 1, wherein said wireless device has sufficient power to transmit said first SRS in parallel with other uplink transmissions in said plurality of cells.

10. The method of claim 1, wherein said first SRS transmission and an uplink physical control packet transmission in said first cell group coincide in the same subframe.

11. A method comprising:

a) receiving, by a wireless device, at least one control message from a base station, said at least one control message causing in said wireless device;

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

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

iii) configuration of transmissions of sounding reference signals (SRSs) on a first cell in said plurality of cells, said first cell being assigned to a first cell group in said plurality of cell groups, said SRSs comprising a first SRS and a second SRS;

b) transmitting, by said wireless device, said first SRS on said first cell in parallel with transmission of at least one of;

i) a first random access preamble in a second cell group different from said first cell group; and

ii) a first uplink data packet on a second cell different from said first cell; and

c) dropping, by said wireless device, said second SRS in a symbol of a subframe if at least one of the following conditions is satisfied;

i) a second random access preamble is transmitted overlapping said symbol in said first cell group; and

ii) a second uplink data packet is transmitted overlapping said symbol in said first cell.

12. A method of claim 11, further comprising dropping said second SRS if said wireless device has insufficient power to transmit said second SRS in parallel with other uplink transmissions in said plurality of cells.

13. The method of claim 11, wherein said first cell group is one of:

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

b) a secondary cell group comprising a second subset of said at least one secondary cell.

14. The method of claim 11, wherein said symbol is the last symbol of said subframe.

15. The method of claim 11, wherein said wireless device has sufficient power to transmit said first SRS in parallel with other uplink transmissions in said plurality of cells.

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;

i) receive at least one control message from a base station, said at least one control message causing in said wireless device;

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

(2) assignment of each of said at least one secondary cell to a cell group in a plurality of cell groups; and

(3) configuration of transmissions of sounding reference signals (SRSs) on a first cell in said plurality of cells, said first cell being assigned to a first cell group in said plurality of cell groups, said SRSs comprising a first SRS and a second SRS; and

ii) transmit said first SRS on said first cell in parallel with transmission of at least one of;

(1) a first random access preamble in a second cell group different from said first cell group; and

(2) a first uplink data packet on a second cell different from said first cell; and

iii) drop said second SRS in a symbol of a subframe if at least one of the following conditions is satisfied;

(1) a second random access preamble is transmitted overlapping said symbol in said first cell group; and

(2) a second uplink data packet is transmitted overlapping said symbol in said first cell.

17. The wireless device of claim 16, wherein said first uplink data packet is transmitted on said first cell group.

18. The wireless device of claim 16, wherein said first SRS transmission and an uplink physical control packet transmission in said first cell group coincide in the same subframe.

19. The wireless device of claim 16, wherein said first cell group is out of sync when said second random access preamble is transmitted on said first cell group.

20. The wireless device of claim 16, wherein said first SRS is transmitted on the last symbol of a first subframe.