Facilitating a two-stage downlink control channel in a wireless communication system

• US 10,644,924 B2
• Filed: 11/01/2016
• Issued: 05/05/2020
• Est. Priority Date: 09/29/2016
• Status: Active Grant

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Nammi, SaiRamesh, Ghosh, Arunabha, Wang, Xiaoyi
• Primary Examiner(s): Thier, Michael
• Assistant Examiner(s): Mensah, Prince A
• Application Number:
  US15/340,744
• Publication Number:
  US 20180092068A1
• Time in Patent Office: 1,281 Days
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0004 applied to control information
• CPC Class Codes: H04L 1/001 applied to control information
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path

Abstract

A two-stage downlink control channel is provided for a wireless communication system. In one example, an apparatus comprises a processor, and a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations. The operation can comprise: transmitting a first portion of a downlink control channel to a mobile device according to a first specification of parameters; and transmitting a second portion of the downlink control channel to the mobile device according to a second specification of the parameters, wherein the second specification of the parameters is adaptively determined based on a condition of an environment in which the first portion of the downlink control channel is transmitted and wherein the second portion is dictated by the first specification of parameters.

Claims

1. An apparatus, comprising:

a processor; and

a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising;

transmitting a first portion of a downlink control channel to a mobile device according to a first specification of parameters; and

transmitting a second portion of the downlink control channel to the mobile device according to a second specification of the parameters, wherein the second specification of the parameters is adaptively determined based on a channel condition in which the first portion of the downlink control channel is transmitted,

wherein the first specification of the parameters is associated with a first type of modulation scheme and a first code rate, wherein the first type of modulation scheme and the first code rate are static irrespective of the channel condition in which the first portion of the downlink control channel is transmitted,

wherein the second specification of the parameters is associated with a second type of modulation scheme, a second code rate and a search space, wherein the second type of modulation scheme, the second code rate and the search space are dynamically determined depending on the channel condition and the first specification of parameters.

2. The apparatus of claim 1, wherein the operations further comprise determining the channel condition in which the first portion of the downlink control channel is transmitted, and wherein the determining is based on channel state information feedback from the mobile device.

3. The apparatus of claim 1, wherein the operations further comprise determining the channel condition in which the first portion of the downlink control channel is transmitted.

4. The apparatus of claim 3, wherein the determining is based on uplink channel information measured by the apparatus.

5. The apparatus of claim 1, wherein the first specification of the parameters is known a priori to the apparatus and a receiver at the mobile device.

6. The apparatus of claim 1, wherein the second specification of the parameters is based on a determination that a signal-to-noise ratio of the channel fails to satisfy a defined condition.

7. The apparatus of claim 1, wherein the downlink control channel comprises a downlink control channel configured to operate according to a Fifth Generation wireless communication protocol.

8. The apparatus of claim 1, wherein the parameters comprise a modulation scheme.

9. The apparatus of claim 1, wherein the parameters comprise a code rate.

10. The apparatus of claim 1, wherein the parameters comprise a constraint length or a search space.

11. The apparatus of claim 10, wherein the search space corresponds to a group of radio resources to be monitored for control channel reception.

12. The apparatus of claim 1, wherein the parameters comprise polynomial information.

13. An apparatus, comprising:

a processor; and

a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising;

transmitting a first portion of a downlink control channel to a mobile device according to a first specification of parameters; and

transmitting a second portion of the downlink control channel to the mobile device according to a second specification of the parameters, wherein the second specification of the parameters is adaptively determined based on a level of resources for the downlink control channel,

wherein the first specification of the parameters is associated with a first type of modulation scheme and a first code rate, wherein the first type of modulation scheme and the first code rate are static irrespective of a channel condition in which the first portion of the downlink control channel is transmitted,

wherein the second specification of the parameters is associated with a second type of modulation scheme, a second code rate and a search space, wherein the second type of modulation scheme, the second code rate and the search space are adaptively determined based on the channel condition and the first specification of parameters.

14. A method, comprising:

determining, by a device comprising a processor, code rates and polynomial information for encoding of a downlink control channel;

determining, by the device, modulation schemes, for modulation of the downlink control channel; and

transmitting, by the device, at least a portion of information via the downlink control channel, wherein the information includes a first one of the code rates and a first one of the polynomial information, wherein the device is configured to update the code rates and polynomial information in response to an update condition being determined to be satisfied,

wherein the first one of the code rates and the first one of the polynomial information are static irrespective of a channel condition in which at least the portion of the downlink control channel information is transmitted, and

wherein a second code rate and a search space are determined as a function of the channel condition, the first one of the code rates, and the first one of the polynomial information.

15. The method of claim 14, wherein the transmitting at least the portion of the downlink control channel information comprises:

transmitting at least the portion of the downlink control channel information employing a modulation scheme of the modulation schemes.

16. The method of claim 15, wherein the modulation scheme of the modulation schemes is a quadrature amplitude modulation scheme.

17. The method of claim 15, wherein the modulation scheme of the modulation schemes is a quadrature phase shift keying modulation scheme.

18. The method of claim 14, wherein the device is a first device configured to operate according to a protocol that provides data rates.

19. The method of claim 18, wherein the data rates are of several tens of megabits per second for tens of thousands of other devices.

20. The method of claim 14, wherein at least the portion of the downlink control channel information comprises a first three orthogonal frequency division multiplexed symbols of a group of 14 symbols in an orthogonal frequency division multiplexed symbol sub-frame.