Sounding signal in a multicarrier wireless device

1. 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 message comprising configuration parameters of:

(1) a plurality of cells grouped into a plurality of cell groups; and

(2) n sounding reference signals (SRSs) configured to be transmitted in a plurality of subframes, n being greater than one;

ii) transmit, on a first cell of a first cell group in said plurality of cell groups, a packet in a plurality of symbols of a first subframe in said plurality of subframes, said plurality of symbols comprising the last symbol of said first subframe;

iii) transmit a first subset of said n SRSs in said last symbol, said first subset consisting of k SRSs, wherein 1<=k<n; and

iv) drop a second subset of said n SRSs in said last symbol, said second subset consisting of m SRSs, wherein 1<=m<n.

2. The wireless device of claim 1 , wherein said wireless device transmits a first SRS in at least one cell in said first cell group in said first subframe, said at least one cell excluding said first cell.

3. The wireless device of claim 1 , wherein an SRS in said n SRSs is dropped if said SRS is configured to be transmitted in said first cell and in said first subframe.

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

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

b) a priority of a transmission power of said packet.

5. 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 message comprising configuration parameters of:

(1) a plurality of cells grouped into a plurality of cell groups; and

(2) n sounding reference signals (SRSs) configured to be transmitted in a plurality of subframes, n being greater than one;

ii) transmit, on a first cell of a first cell group in said plurality of cell groups, a packet in a plurality of symbols of a first subframe in said plurality of subframes, said plurality of symbols comprising the last symbol of said first subframe;

iii) transmit a first subset of said n SRSs in said last symbol on at least one second cell different from said first cell, said first subset consisting of k SRSs, wherein 1<=k<n and said at least one second cell comprises at least one cell in said first cell group; and

iv) drop a second subset of said n SRSs in said last symbol, said second subset consisting of m SRSs, wherein 1<=m<n.

6. The wireless device of claim 5 , wherein said at least one second cell further comprises one or more cells in a second cell group in said plurality of cell groups.

7. The wireless device of claim 5 , wherein an SRS in said n SRSs is dropped if said SRS is configured to be transmitted in said first cell in said first subframe.

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

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

b) a priority of a transmission power of said packet.

9. The wireless device of claim 5 , wherein said wireless device has sufficient power to transmit in parallel said first subset of said n sounding reference signals, said second subset of said n sounding reference signals, and said packet.

10. The wireless device of claim 9 , wherein said at least one second cell further comprises one or more cells in a second cell group in said plurality of cell groups.

11. The wireless device of claim 9 , wherein an SRS in said n SRSs is dropped if said SRS is configured to be transmitted in said second cell group and in said second subframe.

12. The wireless device of claim 9 , wherein an SRS in said n SRSs is dropped if said SRS is configured to be transmitted in said first cell and in said first subframe.

13. The wireless device of claim 9 , wherein said wireless device assigns a lower priority to a transmission power of an SRS compared to:

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

b) a priority of a transmission power of said packet.

14. The wireless device of claim 9 , wherein said packet is one of:

a) a data packet transmitted on a physical uplink shared channel; and

b) a control packet transmitted on a physical uplink control channel.

15. The wireless device of claim 9 , wherein an SRS in said n SRSs is dropped if said wireless device does not have sufficient power to transmit said SRS.

16. The wireless device of claim 9 , wherein said wireless device has sufficient power to transmit in parallel said first subset of said n sounding reference signals, said second subset of said n sounding reference signals, and said packet.

17. The wireless device of claim 9 , wherein said wireless device has insufficient power to transmit in parallel said first subset of said n sounding reference signals, said second subset of said n sounding reference signals, and said packet.

18. The wireless device of claim 9 , wherein:

a) said first subframe is the same subframe as said second subframe; and

b) said first cell group is different from said second cell group.

19. The wireless device of claim 5 , wherein an SRS in said n SRSs is dropped if said wireless device does not have sufficient power to transmit said SRS.

20. 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 message comprising configuration parameters of:

(1) a plurality of cells grouped into a plurality of cell groups; and

(2) n sounding reference signals (SRSs) configured to be transmitted in a plurality of subframes, n being greater than one;

ii) transmit, on a first cell of a first cell group in said plurality of cell groups, a packet in a plurality of symbols of a first subframe in said plurality of subframes, said plurality of symbols comprising the last symbol of said first subframe;

iii) transmit a first subset of said n SRSs in said last symbol on at least one second cell different from said first cell, said first subset consisting of k SRSs, wherein 1<=k<n and said at least one second cell comprises at least one cell in said first cell group;

iv) transmit a random access preamble in a second subframe in said plurality of subframes in a second cell group in said plurality of cell groups; and

v) drop a second subset of said n SRSs on at least one third cell in said second cell group in said second subframe, said second subset consisting of m SRSs, wherein 1<=m<n.