Systems And Methods For Uplink Control Information Signaling Design

• US 20160278074A1
• Filed: 03/15/2016
• Published: 09/22/2016
• Est. Priority Date: 03/17/2015
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Yang, Yu, Larsson, Daniel
• Granted Patent: US 10,015,778 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

According to certain embodiments, a method by a wireless device is provided for transmitting uplink control information (UCI) on a serving cell on the unlicensed spectrum. The method includes formatting the UCI as a shortened control signalling transmission and transmitting the UCI formatted as the shortened control signalling transmission to a network node. The shortened control signalling transmission is transmitted during a transmission opportunity on the serving cell on the unlicensed spectrum without performing channel sensing.

Claims

1. A method by a wireless device for transmitting uplink control information (UCI) on a serving cell on the unlicensed spectrum, the method comprising:

formatting, by the wireless device, the UCI as a shortened control signalling transmission; and

transmitting, by the wireless device, the UCI formatted as the shortened control signalling transmission to a network node, wherein the shortened control signalling transmission transmitted during a transmission opportunity on the serving cell on the unlicensed spectrum without performing channel sensing

2. The method of claim 1, wherein the UCI comprises HARQ acknowledgement.

3. The method of claim 2, wherein the shortened control signalling transmission is a shortened physical uplink control channel (PUCCH) format, the shortened PUCCH transmitted on N OFDM symbols, wherein 0<

=N<

=7.

4. The method of claim 1, wherein a duration of the shortened control signalling transmission does not exceed a maximum threshold.

5. The method of claim 4, wherein the maximum threshold is five percent of the transmission opportunity.

6. The method of claim 1, wherein the UCI comprises aperiodic CSI.

7. The method of claim 6, wherein the shortened control signalling transmission is a shortened physical uplink shared channel (PUSCH) format, the shortened PUSCH transmitted on N OFDM symbols, wherein 0<

=N<

=7.

8. The method of claim 1, wherein the serving cell comprises a license assisted access SCell on the unlicensed spectrum.

9. A method by a wireless device for transmitting at least one HARQ acknowledgement on a serving cell on the unlicensed spectrum, the method comprising:

determining, by the wireless device, whether the wireless device has channel access to at least one serving cell on the unlicensed spectrum on which physical uplink shared channel (PUSCH) transmission is scheduled;

if the wireless device has channel access to the at least one serving cell on which the PUSCH transmission is scheduled, transmitting the at least one HARQ acknowledgement on the at least one serving cell multiplexed with scheduled PUSCH data; and

if the wireless device does not have channel access to the at least one serving cell on which the PUSCH transmission is scheduled,

formatting, by the wireless device, the at least one HARQ acknowledgement in a shortened physical uplink control channel (PUCCH) transmission format; and

transmitting the at least one HARQ acknowledgement in the shortened PUCCH transmission format during a transmission opportunity on at least one serving cell on the unlicensed spectrum without performing channel sensing.

10. The method of claim 9, wherein a duration of the shortened PUCCH transmission format does not exceed a maximum threshold.

11. The method of claim 10, wherein the maximum threshold is five percent of the transmission opportunity.

12. The method of claim 9, wherein the serving cell comprises a license assisted access SCell on the unlicensed spectrum.

13. The method of claim 9, further comprising:

determining that the wireless device has access to the uplink carriers on which the PUSCH transmission is scheduled, wherein the PUSCH transmission is allowed to be transmitted on a plurality uplink carriers; and

selecting one of the plurality of uplink carriers for transmission of the UCI, wherein the one of the plurality of uplink carriers is selected from the group consisting of;

a same carrier as the PUCCH transmission is transmitted on;

a carrier with a highest cell index;

a carrier with a lowest cell index; and

a carrier on which an aperiodic CSI report is requested to be transmitted.

14. A method by a network node for configuring transmission of uplink control information (UCI) on a selected one of a plurality of cells, the method comprising:

assigning, by the network node, each of the plurality of cells to a selected one of a plurality of cell groups;

transmitting, by the network node, a cell selection to a wireless device, the cell selection identifying a cell within each of the plurality of cell groups for use in transmitting the UCI.

15. The method of claim 14, wherein:

the plurality of cell groups comprise a first cell group, the first cell group comprising a primary cell and a plurality of secondary cells on the licensed spectrum; and

the cell selection identifies the primary cell within the first cell group for transmission of the UCI.

16. The method of claim 14, wherein:

the plurality of cell groups comprise a first cell group, the first cell group comprising a plurality of secondary cells on the unlicensed spectrum;

the cell selection identifies a selected one of the plurality of secondary cells on the unlicensed spectrum for transmission of the UCI.

17. The method of claim 14, wherein the plurality of cell groups comprise:

a first cell group comprising a primary cell on the licensed spectrum and at least one secondary cell on the unlicensed spectrum; and

the cell selection identifies the primary cell within the first cell group for transmission of the UCI.

18. The method of claim 14, wherein the plurality of cell groups comprise:

a first cell group comprising at least one secondary cell on the licensed spectrum and at least one secondary cell on the unlicensed spectrum; and

the cell selection identifies a secondary cell on the licensed spectrum within the first cell group for transmission of the UCI.

19. The method of claim 14, wherein the UCI comprises HARQ acknowledgment.

20. The method of claim 14, wherein the UCI comprises aperiodic CSI.

21. A method by a wireless device for transmitting uplink control information (UCI), the method comprising:

performing, by the wireless device, a carrier sensing procedure;

based on the carrier sensing procedure, determine whether the wireless device has channel access on at least one serving cell on the unlicensed spectrum;

if the wireless device has channel access to the at least one serving cell on the unlicensed spectrum, transmitting the UCI on the at least one serving cell; and

if the wireless device does not have channel access to the at least one serving cell on the unlicensed spectrum, scheduling the UCI to be transmitted on at least one serving cell on the licensed spectrum in a next transmission.

22. The method of claim 21, wherein the UCI comprises aperiodic CSI.

23. The method of claim 21, wherein the UCI comprises a HARQ acknowledgment.

24. The method of claim 21, wherein the at least one serving cell comprises a license assisted access SCell on the unlicensed spectrum.