Control signaling optimization for LTE communications

• US 9,854,602 B2
• Filed: 09/30/2014
• Issued: 12/26/2017
• Est. Priority Date: 09/30/2013
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Tabet, Tarik, Majjigi, Vinay R., Mucke, Christian W., Mujtaba, Syed A.
• Primary Examiner(s): Abelson, Ronald B
• Application Number:
  US14/502,545
• Publication Number:
  US 20150092563A1
• Time in Patent Office: 1,183 Days
• Field of Search: 370311, 370328, 370329
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 28/0221 power availability or consumption
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The disclosure describes procedures for allocating network resources for a mobile device communicating within a Long Term Evolution (LTE) network. The mobile device can be configured to decode a physical downlink shared channel (PDSCH), acquire first and second physical downlink control channel (PDCCH) decode indicators from a payload of the same PDSCH communication, decode a PDCCH for downlink control information (DCI) associated with a first application data type based on the first PDCCH decode indicator a second application data type based on the second PDCCH decode indicator. The first PDCCH decode indicator can identify an upcoming LTE subframe where the mobile device is required to decode the PDCCH for DCI associated VoLTE resource assignments and the second PDCCH decode indicator can identify an upcoming LTE subframe where the mobile device is required to decode the PDCCH for DCI associated with high bandwidth best effort (BE) data resource assignments.

Claims

1. A method for allocating network resources for a user equipment (UE) communicating within a Long Term Evolution (LTE) network, the method comprising:

by a network apparatus;

configuring the UE to decode a physical downlink control channel (PDCCH) on demand, based on PDCCH decode indicators that indicate one or more subframes in which to decode the PDCCH, and otherwise refrain from decoding the PDCCH for a first period of time;

identifying a plurality of application data types being communicated by the UE within the LTE network;

generating a first PDCCH decode indicator for a first application data type of the plurality of application data types, the first application data type corresponding to low bandwidth periodic application data;

generating a second PDCCH decode indicator for a second application data type of the plurality of application data types, the second application data type corresponding to high bandwidth best effort (BE) application data;

sending the first PDCCH decode indicator and the second PDCCH decode indicator to the UE within a payload of a single physical downlink shared channel (PDSCH) communication during the first period of time,

wherein;

the first PDCCH decode indicator indicates a first LTE subframe where the UE is required to decode the PDCCH for downlink control information (DCI) associated with downlink (DL) resource assignments for the low bandwidth periodic application data, and

the second PDCCH decode indicator indicates either a second LTE subframe or a group of LTE subframes where the UE is required to decode the PDCCH for DCI associated with DL resource assignments for the high bandwidth BE application data; and

further configuring the UE to decode the PDCCH periodically for voice over LTE (VoLTE) data resource allocations at one or more reserved subframe locations during an ON duration of a connected mode discontinuous reception (C-DRX) cycle in accordance with a semi-persistent scheduling (SPS) periodicity of the VoLTE data during a second period of time with PDCCH decoding otherwise disabled.

2. The method of claim 1, wherein the first application data type of the plurality of application data types corresponds to low bandwidth periodic application data.

3. The method of claim 1, wherein the first PDCCH decode indicator for the first application data type is sent to the UE as a bitmap identifying the first LTE subframe where the UE is required to decode the PDCCH for the DCI associated with the DL resource assignments for the low bandwidth periodic application data on the PDSCH.

4. The method of claim 1, wherein the second PDCCH decode indicator for the second application data type is sent to the UE as a bitmap identifying the second LTE subframe or group of LTE subframes where the UE is required to decode the PDCCH for the DCI associated with the DL resource assignments for the high bandwidth BE application data on the PDSCH.

5. The method of claim 1, wherein the first PDCCH decode indicator for the first application data type is sent to the UE as a bit flag identifying a time associated with the first LTE subframe when the UE is required to decode the PDCCH for the DCI associated with the DL resource assignments for the low bandwidth periodic application data on the PDSCH.

6. The method of claim 1, wherein the second PDCCH decode indicator for the second application data type is sent to the UE as a bit flag identifying a time associated with the second LTE subframe or group of LTE subframes when the UE is required to decode the PDCCH for the DCI associated with the DL resource assignments for the high bandwidth BE application data on the PDSCH.

7. The method of claim 1, wherein no PDCCH decode indicators are sent to the UE for voice over LTE (VoLTE) application data when the UE is informed of a periodicity of the VoLTE application data and is configured to decode the PDSCH periodically for VoLTE application data.

8. A mobile device, comprising:

at least one transceiver configurable to communicate via a long term evolution (LTE) network;

one or more processors; and

a storage device storing executable instructions that, when executed by the one or more processors, cause the mobile device to;

decode a physical downlink control channel (PDCCH) on demand, based on PDCCH decode indicators received from the LTE network and indicating one or more LTE subframes in which to decode the PDCCH, and otherwise refrain from decoding the PDCCH for a first period of time;

decode a physical downlink shared channel (PDSCH) received from the LTE network;

acquire a first PDCCH decode indicator and a second PDCCH decode indicator from a payload portion of a single PDSCH communication;

decode the PDCCH of a first LTE subframe for downlink control information (DCI) associated with a first application data type based on the first PDCCH decode indicator during the first period of time;

decode the PDCCH of a second LTE subframe or a group of LTE subframes for DCI associated with a second application data type based on the second PDCCH decode indicator during the first period of time,

wherein;

the first PDCCH decode indicator indicates the first LTE subframe where the mobile device is required to decode the PDCCH for downlink control information (DCI) associated with downlink (DL) resource assignments for low bandwidth periodic application data, and

the second PDCCH decode indicator indicates either the second LTE subframe or the group of LTE subframes where the mobile device is required to decode the PDCCH for DCI associated with DL resource assignments for high bandwidth best effort (BE) application data; and

decode the PDCCH periodically for voice over LTE (VoLTE) data resource allocations at one or more reserved LTE subframe locations during an ON duration of a connected mode discontinuous reception (C-DRX) cycle in accordance with a semi-persistent scheduling (SPS) periodicity of the VoLTE data during a second period of time with PDCCH decoding otherwise disabled.

9. The mobile device of claim 8, wherein the first PDCCH decode indicator identifies a time associated with the first LTE subframe when the mobile device is required to decode the PDCCH for DCI associated with the DL resource assignments for the low bandwidth periodic application data on the PDSCH.

10. The mobile device of claim 8, wherein the second PDCCH decode indicator identifies a time associated with the second LTE subframe or the group of LTE subframes when the mobile device is required to decode the PDCCH for DCI associated with the DL resource assignments for the high bandwidth BE application data on the PDSCH.

11. The mobile device of claim 8, wherein execution of the executable instructions further causes the mobile device to:

decode the PDSCH for application data of the first application data type based on the DCI associated with DL resource assignments for the first application data type; and

decode the PDSCH for application data of the second application data type based on the DCI associated with DL resource assignments for the second application data type.

12. The mobile device of claim 8, wherein the first PDCCH decode indicator is sent to the mobile device as a bitmap identifying the first LTE subframe where the mobile device is required to decode the PDCCH for the DCI associated with the DL resource assignments for the low bandwidth periodic application data on the PDSCH.

13. The mobile device of claim 8, wherein the second PDCCH decode indicator is sent to the mobile device as a bitmap identifying the second LTE subframe or group of LTE subframes where the mobile device is required to decode the PDCCH for the DCI associated with the DL resource assignments for the high bandwidth BE application data on the PDSCH.

14. The mobile device of claim 8, wherein the first PDCCH decode indicator is sent to the mobile device as a bit flag identifying a time associated with the first LTE subframe when the mobile device is required to decode the PDCCH for the DCI associated with the DL resource assignments for the low bandwidth periodic application data on the PDSCH.

15. The mobile device of claim 8, wherein the second PDCCH decode indicator is sent to the mobile device as a bit flag identifying a time associated with the second LTE subframe or group of LTE subframes when the mobile device is required to decode the PDCCH for the DCI associated with the DL resource assignments for the high bandwidth BE application data on the PDSCH.

16. The mobile device of claim 8, wherein no PDCCH decode indicators are sent to the mobile device for voice over LTE (VoLTE) application data when the mobile device is informed of a periodicity of the VoLTE application data and is configured to decode the PDSCH periodically for VoLTE application data.

17. A non-transitory computer-readable medium storing executable instructions that, when executed by one or more processors of a network apparatus of a Long Term Evolution (LTE) network, cause the network apparatus to:

configure a mobile device to decode a physical downlink control channel (PDCCH) on demand, based on PDCCH decode indicators that indicate one or more LTE subframes in which to decode the PDCCH, and otherwise refrain from decoding the PDCCH for a first period of time;

identify a plurality of application data types being communicated by the mobile device within the LTE network;

generate a first PDCCH decode indicator for a first application data type of the plurality of application data types, the first application data type corresponding to low bandwidth periodic application data;

generate a second PDCCH decode indicator for a second application data type of the plurality of application data types, the second application data type corresponding to high bandwidth best effort (BE) application data;

send the first PDCCH decode and the second PDCCH decode indicator to the mobile device within a payload of a single physical downlink shared channel (PDSCH) communication during the first period of time,

wherein;

the first PDCCH decode indicator indicates a first LTE subframe where the mobile device is required to decode the PDCCH for downlink control information (DCI) associated with downlink (DL) resource assignments for the low bandwidth periodic application data, and

the second PDCCH decode indicator indicates either a second LTE subframe or a group of LTE subframes where the mobile device is required to decode the PDCCH for DCI associated with DL resource assignments for the high bandwidth BE application data; and

configure the mobile device to decode the PDCCH periodically for voice over LTE (VoLTE) data resource allocations at one or more reserved subframe locations during an ON duration of a connected mode discontinuous reception (C-DRX) cycle in accordance with a semi-persistent scheduling (SPS) periodicity of the VoLTE data during a second period of time with PDCCH decoding otherwise disabled.

18. The non-transitory computer-readable medium of claim 17, wherein:

the first PDCCH decode indicator is sent to the mobile device as a bitmap identifying the first LTE subframe where the mobile device is required to decode the PDCCH for the DCI associated with the DL resource assignments for the low bandwidth periodic application data on the PDSCH.

19. The non-transitory computer-readable medium of claim 18, wherein:

the second PDCCH decode indicator is sent to the mobile device as a bitmap identifying the second LTE subframe or the group of LTE subframes where the mobile device is required to decode the PDCCH for DCI associated with the DL resource assignments for the high bandwidth BE application data on the PDSCH.

20. The non-transitory computer-readable medium of claim 17, wherein no PDCCH decode indicators are sent to the mobile device for voice over LTE (VoLTE) application data when the mobile device is informed of a periodicity of the VoLTE application data and is configured to decode the PDSCH periodically for VoLTE application data.