Rate matching and semi persistent scheduling configuration in wireless communications

Patent metadata

Field	Value
Publication number	US-2020021391-A1
Application number	US-201916507282-A
Country	US
Kind code	A1
Filing date	Jul 10, 2019
Priority date	Jul 13, 2018
Publication date	Jan 16, 2020
Grant date	—

Abstract

Methods, systems, and devices for wireless communications are described for identifying a modulation and coding scheme (MCS) independently of a channel quality indicator (CQI) table that is configured at a user equipment (UE). A rate matching parameter may be determined based on one or more of the MCS or CQI table, which may be used for dimensioning a soft buffer that is used to store received transmissions for decoding. The MCS field may be a six-bit field and may indicate an MCS that exceeds a highest MCS associated with the CQI table. The base station may activate a semi-persistent scheduling (SPS) configuration at the UE through an activation command, and the UE may verify that SPS is activated based on information in a number of different fields of control information which may include the MCS field.

First claim

What is claimed is:

1 . A method for wireless communication at a user equipment (UE), comprising:
identifying a channel quality indication (CQI) table that provides one or more parameters associated with one or more modulation orders for transmissions between the UE and a base station; receiving, from the base station, control information for a downlink transmission, the control information including a first index value for a first entry in a modulation and coding scheme (MCS) table, wherein the first entry in the MCS table indicates a first modulation order independently of the one or more modulation orders of the CQI table; and determining a rate matching parameter for the downlink transmission based at least in part on at least one of the first modulation order or the CQI table.

2 . The method of claim 1 , further comprising:
discarding the control information when the first modulation order exceeds a maximum modulation order of the one or more modulation orders of the CQI table.

3 . The method of claim 2 , further comprising:
setting a power of receive circuitry based at least in part on the maximum modulation order of the one or more modulation orders of the CQI table.

4 . The method of claim 1 , wherein the first index value is a six-bit index value that identifies the first entry from 64 available entries of the MCS table.

5 . The method of claim 1 , wherein the determining the rate matching parameter comprises:
determining that the first modulation order exceeds a maximum modulation order of the one or more modulation orders of the CQI table; and determining the rate matching parameter based on a highest entry in the MCS table that has a modulation order that is supported by the UE.

6 . The method of claim 1 , wherein the rate matching parameter is based at least in part on a highest supported modulation order supported by the UE for a radio frequency band or band combination used for the downlink transmission.

7 . The method of claim 1 , further comprising:
receiving radio resource control (RRC) signaling that includes a signaled modulation order that is different than a modulation order indicated in the first entry in the MCS table.

8 . The method of claim 1 , further comprising:
determining a first transport block size for the downlink transmission based at least in part on the first modulation order; comparing the first transport block size to a maximum transport block size that is identified based at least in part on a maximum modulation order of the one or more modulation orders of the CQI table; receiving the downlink transmission when the first transport block size is less than or equal to the maximum transport block size; and discarding the control information when the first transport block size exceeds the maximum transport block size.

9 . The method of claim 1 , wherein the control information is first control information and the downlink transmission is a first downlink transmission, and wherein the method further comprises:
receiving the first downlink transmission based at least in part on the determined rate matching parameter and the first modulation order; receiving, from the base station, second control information for a second downlink transmission, the second control information including a second index value for a second entry in the MCS table; and receiving the second downlink transmission based at least in part on the first modulation order and the determined rate matching parameter.

10 . The method of claim 1 , further comprising:
transmitting, to the base station, a capability indication that indicates the UE is capable of operating at a modulation order that exceeds a maximum modulation order indicated by the CQI table.

11 . The method of claim 10 , further comprising:
receiving, responsive to the capability indication, a modulation order indication that indicates that the base station will transmit one or more downlink transmissions having the modulation order that exceeds the maximum modulation order indicated by the CQI table; and processing the control information based on the modulation order indication.

12 . The method of claim 11 , further comprising:
selecting an operating power for one or more receive components of the UE based at least in part on the modulation order indication.

13 . A method for wireless communication at a base station, comprising:
identifying a channel quality indication (CQI) table that provides one or more parameters associated with one or more modulation orders for transmissions between the base station and a user equipment (UE); transmitting, to the UE, control information for a downlink transmission, the control information including a first index value for a first entry in a modulation and coding scheme (MCS) table, wherein the first entry in the MCS table indicates a first modulation order independently of the one or more modulation orders of the CQI table; and transmitting the downlink transmission to the UE using the first modulation order.

14 . The method of claim 13 , wherein the first index value is a six-bit index value that identifies the first entry from 64 available entries of the MCS table.

15 . The method of claim 13 , wherein the first modulation order is selected to be at or below a maximum modulation order of the one or more modulation orders of the CQI table.

16 . The method of claim 13 , further comprising:
determining a highest modulation order supported by the UE for a radio frequency band or band combination to be used for the downlink transmission; selecting the first modulation order as the highest modulation order, wherein the first modulation order corresponds to or exceeds a maximum modulation order of the one or more modulation orders of the CQI table; and transmitting the downlink transmission using the highest modulation order supported by the UE.

17 . The method of claim 13 , further comprising:
transmitting radio resource control (RRC) signaling that includes a signaled modulation order that is different than a modulation order indicated in the first entry in the MCS table.

18 . The method of claim 13 , further comprising:
determining a first transport block size for the downlink transmission that is less than or equal to a maximum transport block size that is identified based at least in part on a maximum modulation order of the one or more modulation orders of the CQI table, and wherein the downlink transmission uses the first transport block size.

19 . The method of claim 13 , wherein the control information is first control information and the downlink transmission is a first downlink transmission, and wherein the method further comprises:
transmitting, to the UE, second control information for a second downlink transmission, the second control information including a second index value for a second entry in the MCS table; and transmitting the second downlink transmission using the first modulation order.

20 . The method of claim 13 , further comprising:
receiving, from the UE, a capability indication that indicates the UE is capable of operating at a modulation order that exceeds a maximum modulation order indicated by the CQI table.

21 . The method of claim 20 , further comprising:
transmitting, responsive to the capability indication, a modulation order indication that indicates that the base station will transmit one or more downlink transmissions having the modulation order that exceeds the maximum mo

Assignees

• Qualcomm Inc

Inventors

• Rico Alvarino Alberto
• Liu Le

Classifications

• H04W72/535 Primary

  based on resource usage policies · CPC title

• H04L27/34

  Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems · CPC title

• H04L27/0008

  arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453) · CPC title

• H04L1/0023 Primary

  characterised by the signalling · CPC title

• H04L1/0013

  Rate matching, e.g. puncturing or repetition of code symbols · CPC title