HARQ PROCESS NUMBER MANAGEMENT FOR DOWNLINK CARRIER AGGREGATION

• US 20150043508A1
• Filed: 10/24/2014
• Published: 02/12/2015
• Est. Priority Date: 03/16/2009
• Status: Active Grant

• Current Assignee: Wireless Innovations LLC
• Original Assignee: Blackberry Limited
• Inventors: MCBEATH, Sean Michael, CAI, Zhijun, YU, Yi
• Granted Patent: US 9,907,062 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method for designating, by a user agent supporting multiple carriers in a wireless communication network, one assigned carrier as an anchor carrier, at least one assigned carrier as an inactive carrier, and at least one assigned carrier as an active carrier. The method can also include receiving a command from an enhanced node B causing a first carrier to transition from an inactive carrier to an active carrier. Additionally, the method can include responsive to reception of the command, monitoring a control channel corresponding to the first carrier. Further, the method can also include receiving downlink control information (DCI) via the control channel. The method can also include responsive to reception of the DCI, starting a timer, and deactivating the first carrier at the expiration of the timer.

Claims

1. A method comprising:

designating, by a user agent supporting multiple carriers in a wireless communication network, one assigned carrier as an anchor carrier, at least one assigned carrier as an inactive carrier, and at least one assigned carrier as an active carrier;

receiving a command from an enhanced node B causing a first carrier to transition from an inactive carrier to an active carrier;

responsive to reception of the command, monitoring a control channel corresponding to the first carrier;

receiving downlink control information (DCI) via the control channel;

responsive to reception of the DCI, starting a timer; and

deactivating the first carrier at the expiration of the timer.

2. The method of claim 1, further comprising:

restarting, by the user agent, the timer when a packet is received on the first carrier.

3. The method of claim 2, wherein the DCI allocates resources to the user agent.

4. The method of claim 3, wherein the packet includes a hybrid automatic repeat request (HARQ) process indicator (HPI).

5. The method of claim 1, wherein the control channel is a physical downlink control channel (PDCCH).

6. The method of claim 1, further comprising monitoring, by the user agent, a control channel of an anchor carrier of the multiple carriers, wherein the anchor carrier is the only carrier routinely monitored by the user agent.

7. The method of claim 1, wherein the deactivating causes the first carrier to be designated as inactive.

8. The method of claim 1, wherein the user agent is one of:

a wireless handset, a pager, a personal digital assistant, a portable computer, a tablet, a laptop computer, a mobile phone, a telecommunications device, a set-top box, a network node and a desktop computer.

9. A user agent for use in a wireless communication network, the user agent comprising:

a processor; and

a communications subsystem,

wherein the user agent is configured to;

receive a command from an enhanced node B causing a first carrier to transition from an inactive carrier to an active carrier;

responsive to reception of the command, monitor a control channel corresponding to the first carrier;

receive downlink control information (DCI) via the control channel;

responsive to reception of the DCI, start a timer; and

deactivate the first carrier at the expiration of the timer.

10. The user agent of claim 9, wherein the user agent is further configured to:

restart the timer when a packet is received on the first carrier.

11. The user agent of claim 10, wherein the DCI packet allocates resources to the user agent.

12. The user agent of claim 11, wherein the packet includes a hybrid automatic repeat request (HARQ) process indicator (HPI).

13. The user agent of claim 9, wherein the control channel is a physical downlink control channel (PDCCH).

14. The user agent of claim 9, wherein the user agent is further configured to monitor a control channel of an anchor carrier of the multiple carriers, wherein the anchor carrier is the only carrier routinely monitored by the user agent.

15. The user agent of claim 9, wherein the deactivating causes the first carrier to be designated as inactive.

16. The user agent of claim 9, wherein the user agent is one of:

a wireless handset, a pager, a personal digital assistant, a portable computer, a tablet, a laptop computer, a mobile phone, a telecommunications device, a set-top box, a network node and a desktop computer.

17. A computer readable medium having instructions stored thereon for execution by a processor of a user agent, the instructions comprising code for:

receiving a command from an enhanced node B causing a first carrier to transition from an inactive carrier to an active carrier;

responsive to reception of the command, monitoring a control channel corresponding to the first carrier;

receiving downlink control information (DCI) via the control channel;

responsive to reception of the DCI, starting a timer; and

deactivating the first carrier at the expiration of the timer.