Sounding reference signal transmission
A first transmission of sounding reference signals is 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 packet on a second cell. The wireless device drops a second transmission of sounding reference signals 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.
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 grouped into a plurality of cell groups; and
ii) transmissions of sounding reference signals (SRSs) on a first cell assigned to a first cell group in said plurality of cell groups;
b) transmitting a first transmission of said SRSs 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 packet on a second cell different from said first cell; and
c) dropping a second transmission of said SRSs in a symbol 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 packet is transmitted overlapping said symbol in said first cell; and
iii) said wireless device has insufficient power to transmit said second transmission 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 packet is transmitted on an uplink data channel or an uplink control 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 a primary cell; and
b) a secondary cell group comprising a second subset of at least one secondary cell in said plurality of cells.
4. The method of claim 1 , wherein said first transmission of said SRSs is transmitted on the last symbol of a subframe.
5. The method of claim 1 , wherein said wireless device has sufficient power to transmit said first transmission of said SRSs in parallel with other uplink transmissions in said plurality of cells.
6. 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 grouped into a plurality of cell groups; and
ii) transmissions of sounding reference signals (SRSs) on a first cell assigned to a first cell group in said plurality of cell groups;
b) transmitting a first transmission of said SRSs 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 packet on a second cell different from said first cell; and
c) dropping a second transmission of said SRSs in a symbol 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 packet is transmitted overlapping said symbol in said first cell.
7. A method of claim 6 , further comprising dropping said second transmission of said SRSs if said wireless device has insufficient power to transmit said second transmission in parallel with other uplink transmissions in said plurality of cells.
8. The method of claim 6 , 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 a primary cell; and
b) a secondary cell group comprising a second subset of at least one secondary cell in said plurality of cells.
9. The method of claim 6 , wherein said symbol is the last symbol of a subframe.
10. The method of claim 6 , wherein said wireless device has sufficient power to transmit said first transmission of said SRSs in parallel with other uplink transmissions in said plurality of cells.
11. 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 causing configuration of:
(1) a plurality of cells grouped into a plurality of cell groups; and
(2) transmissions of sounding reference signals (SRSs) on a first cell assigned to a first cell group in said plurality of cell groups;
ii) transmit a first transmission of said SRSs 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 packet on a second cell different from said first cell; and
iii) drop a second transmission of said SRSs in a symbol 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 packet is transmitted overlapping said symbol in said first cell.
12. The wireless device of claim 11 , wherein said first packet is transmitted on said first cell group.
13. The wireless device of claim 11 , wherein said first transmission of said SRSs and an uplink physical control packet transmission in said first cell group coincide in the same subframe.
14. The wireless device of claim 11 , wherein said first cell group is out of sync when said second random access preamble is transmitted on said first cell group.
15. The wireless device of claim 11 , wherein said first transmission of said SRSs is transmitted on the last symbol of a subframe.
16. The wireless device 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 a primary cell; and
b) a secondary cell group comprising a second subset of at least one secondary cell in said plurality of cells.
17. The wireless device of claim 11 , wherein:
a) said first random access preamble is transmitted on a random access channel; and
b) said first packet is transmitted on an uplink data channel or an uplink control channel.
18. The wireless device of claim 11 , wherein said first packet is transmitted on said first cell group.
19. The wireless device of claim 11 , wherein said SRSs are type zero sounding reference signals.
20. The wireless device of claim 11 , wherein said first packet is one of:
a) a first uplink data packet on an uplink data channel; and
b) a first uplink control packet on an uplink control channel.