Control information MCS offset determination for UCI on PUSCH with shortened TTI

Patent metadata

Field	Value
Publication number	US-10505692-B2
Application number	US-201715736186-A
Country	US
Kind code	B2
Filing date	Sep 28, 2017
Priority date	Sep 30, 2016
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

According to certain embodiments, a method is disclosed for use in a wireless device that is transmitting uplink transmissions using a shortened transmission time interval (sTTI). The method comprises receiving control information from a network node. The control information indicates at least one index, and a beta-offset value is obtained based on the indicated index.

First claim

The invention claimed is:

1. A method for use in a wireless device for obtaining a beta-offset value, wherein the wireless device is transmitting uplink using a shortened transmission time interval (sTTI), the method comprising:
receiving, from a network node, control information indicating at least one index, wherein the beta-offset value is obtained based on the indicated index;
wherein the beta-offset value is a modulation and coding scheme (MCS) offset for uplink control information (UCI) being sent on sPUSCH, a physical uplink shared channel (PUSCH) using a sTTI.

2. The method of claim 1 , further comprising:
obtaining the beta-offset value by mapping the received at least one index to a corresponding beta-value using a table.

3. The method of claim 2 , wherein the table comprises at least one index corresponding to a beta-offset value for transmitting UCI on the sPUSCH with the sTTI, and wherein the at least one index corresponding to the beta-offset value for transmitting UCI on the sPUSCH with the sTTI is different than any index corresponding to a beta-offset value for transmitting UCI on a PUSCH with a normal transmission time interval (TTI) of 1 ms.

4. The method of claim 2 , wherein the at least one index is specific for communication using sTTI, while the table used is common for sTTI and normal TTI of 1 millisecond (ms).

5. The method of claim 2 , wherein the table is configured to be the same as an existing table for transmitting the uplink control information (UCI) on a physical uplink shared channel (PUSCH) with a normal TTI of 1 millisecond (ms).

6. The method of claim 5 , wherein the existing table is configured according to LTE Release 14 or earlier release.

7. The method of claim 2 , wherein the table is selected from a plurality of tables and the control information indicates the selected table.

8. The method of claim 7 , wherein the plurality of tables comprise a first table associated with a first type of UCI and a second table associated with a second type of UCI.

9. The method of claim 8 , wherein the beta-offset value in the first table is independent of the length of the sTTI for the first type of UCI.

10. The method of claim 8 , wherein the beta-offset value in the first table depends on the length of the sTTI for the first type of UCI.

11. The method of claim 2 , wherein the table comprises:
one or more indexes defined for normal TTI of 1 millisecond (ms) according to an existing table; and
one or more indexes defined for sTTI and added to the existing table;
wherein the indicated index corresponds to one of the indexes defined for sTTI.

12. The method of claim 2 , wherein the table reuses fewer than all of the existing indexes of an existing table.

13. The method claim 1 , further comprising:
transmitting uplink control information (UCI) on sPUSCH, a physical uplink shared channel (PUSCH) using a sTTI, using the obtained beta-offset value.

14. The method of claim 1 , wherein the at least one index is selected from a plurality of indexes each mapping to a corresponding beta-offset value using a table.

15. The method of claim 1 , wherein the index(es) indicated in the control information are based on a payload size of a hybrid automatic repeat request-acknowledgement (HARQ-ACK) transmission.

16. The method of claim 1 , wherein the index is received via radio resource control (RRC) signaling.

17. The method of claim 1 , wherein the control information indicates whether to apply scaling to the beta-offset value that maps to the indicated index.

18. The method of claim 17 , wherein the scaling is according to a scaling factor that is pre-defined based on the length of the sTTI.

19. The method of claim 17 , wherein the control information further comprises a scaling factor to apply to the beta-offset value that maps to the indicated index.

20. The method of claim 1 , wherein:
the control information indicates more than one index; and
the method further comprises selecting, by the wireless device, which beta-offset value to apply, the selected beta-offset value corresponding to any of the indicated indexes.

21. The method of claim 1 , wherein the sTTI is less than a transmission time interval specified in long term evolution (LTE) release 8.

22. A method for use in a network node for indicating a beta-offset value to a wireless device, wherein the wireless device is transmitting uplink transmissions using a shortened transmission time interval (sTTI), the method comprising:
communicating to one or more wireless devices control information indicating at least one index, wherein:
the beta-offset value is obtained based on the indicated index; and
the beta-offset value is a modulation and coding scheme (MCS) offset for uplink control information (UCI) being sent on sPUSCH, a physical uplink shared channel (PUSCH) using a sTTI.

23. The method of claim 22 , further comprising determining which index(es) to indicate in the control information independently of the length of the sTTI.

24. The method of claim 22 , further comprising determining which index(es) to indicate in the control information based on the length of the sTTI.

25. A wireless device comprising memory operable to store instructions and processing circuitry operable to execute the instructions, whereby the wireless device is operable to:
receive, from a network node, control information indicating at least one index; and
obtain a beta-offset value for an uplink transmission having a shortened transmission time interval (sTTI), wherein:
the beta-offset value is obtained based on the indicated index; and
the beta-offset value is a modulation and coding scheme (MCS) offset for uplink control information (UCI) being sent on sPUSCH, a physical uplink shared channel (PUSCH) using a sTTI.

26. A network node comprising memory operable to store instructions and processing circuitry operable to execute the instructions, whereby the network node is operable to:
communicate control information to one or more wireless devices, the control information indicating at least one index, wherein:
a beta-offset value for an uplink transmission having a shortened transmission time interval (sTTI) is obtained based on the indicated index; and
the beta-offset value is a modulation and coding scheme (MCS) offset for uplink control information (UCI) being sent on sPUSCH, a physical uplink shared channel (PUSCH) using a sTTI.

27. A computer program product comprising a non-transitory computer readable medium storing computer readable program code, the computer readable program code comprises:
program code for receiving, from a network node, control information indicating at least one index; and
program code for obtaining a beta-offset value for an uplink transmission having a shortened transmission time interval (sTTI), wherein:
the beta-offset value is obtained based on the indicated index; and
the beta-offset value is a modulation and coding scheme (MCS) offset for uplink control information (UCI) being sent on sPUSCH, a physical uplink shared channel (PUSCH) using a sTTI.

28. A method for use in a wireless device transmitting UCI on sPUSCH, for obtaining a beta-offset value, the method comprising:
receiving from a network node an index, wherein the index is configured independently for sTTI transmission compared to normal TTI transmission; and
mapping the received

Assignees

• Ericsson Telefon Ab L M

Inventors

• Li Jingya
• Falconetti Laetitia
• Larsson Daniel

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/542

  using measured or perceived quality · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title

• H04L5/0055 Primary

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04L1/007

  Unequal error protection (for format H04L1/0078; for codes per se H03M13/35) · CPC title