Uplink and Downlink Hybrid Automatic Repeat Request In Time Division Multiplex Communications

• US 20090279458A1
• Filed: 03/24/2009
• Published: 11/12/2009
• Est. Priority Date: 03/24/2008
• Status: Abandoned Application

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Shen, Zukang, Muharemovic, Tarik
• Application Number:
  US12/409,691
• Publication Number:
  US 20090279458A1
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053

Abstract

This invention notes various patterns of uplink and downlink communication in a wireless communication system which satisfy the requirement that a user equipment receiving a downlink grant in subframe n needs to transmit response ACK/NAK bits in an uplink subframe n+k, where k>3 and a user equipment receiving a DL grant or ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in subframe n needs to transmit or retransit UL data bits in an uplink (UL) subframe n+k, where k>3.

Claims

1. A method of responding to a downlink grant in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 5 and 6 to downlink communication;

assigning subframes 2, 3, 4, 7, 8 and 9 to uplink communication;

upon receiving a downlink grant in subframe 0, the user equipment transmitting a responsive ACK/NAK signal in subframe 4;

upon receiving a downlink grant in subframe 1, the user equipment transmitting a responsive ACK/NAK signal in subframe 7;

upon receiving a downlink grant in subframe 5, the user equipment transmitting a responsive ACK/NAK signal in subframe 9; and

upon receiving a downlink grant in subframe 6, the user equipment transmitting a responsive ACK/NAK signal in subframe 1 of the next frame.

2. A method of responding to a downlink grant in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 4, 5, 6 and 9 to downlink communication;

assigning subframes 2, 3, 7 and 8 to uplink communication;

upon receiving a downlink grant in subframe 0, the user equipment transmitting a responsive ACK/NAK signal in subframe 7;

upon receiving a downlink grant in subframe 1, the user equipment transmitting a responsive ACK/NAK signal in subframe 7;

upon receiving a downlink grant in subframe 4, the user equipment transmitting a responsive ACK/NAK signal in subframe 8;

upon receiving a downlink grant in subframe 5, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 6, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame.

3. A method of responding to a downlink grant in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 3, 4, 5, 6, 8 and 9 to downlink communication;

assigning subframes 2 and 7 to uplink communication;

upon receiving a downlink grant in subframe 0, the user equipment transmitting a responsive ACK/NAK signal in subframe 7;

upon receiving a downlink grant in subframe 1, the user equipment transmitting a responsive ACK/NAK signal in subframe 7;

upon receiving a downlink grant in subframe 3, the user equipment transmitting a responsive ACK/NAK signal in subframe 7;

upon receiving a downlink grant in subframe 4, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 5, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 6, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 8, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 9, the user equipment transmitting a responsive ACK/NAK signal in subframe 7 of the next frame.

4. A method of responding to a downlink grant in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 5, 6, 7, 8 and 9 to downlink communication;

assigning subframes 2, 3 and 4 to uplink communication;

upon receiving a downlink grant in subframe 0, the user equipment transmitting a responsive ACK/NAK signal in subframe 4;

upon receiving a downlink grant in subframe 1, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 5, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 6, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 7, the user equipment transmitting a responsive ACK/NAK signal in subframe 3 of the next frame;

upon receiving a downlink grant in subframe 8, the user equipment transmitting a responsive ACK/NAK signal in subframe 3 of the next frame;

upon receiving a downlink grant in subframe 9, the user equipment transmitting a responsive ACK/NAK signal in subframe 3 of the next frame.

5. A method of responding to a downlink grant in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 5, 6, 7, 8 and 9 to downlink communication;

assigning subframes 2, 3 and 4 to uplink communication;

upon receiving a downlink grant in subframe 0, the user equipment transmitting a responsive ACK/NAK signal in subframe 4;

upon receiving a downlink grant in subframe 1, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 5, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 6, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 7, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 8, the user equipment transmitting a responsive ACK/NAK signal in subframe 3 of the next frame.

6. A method of responding to a downlink grant in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 5, 6, 7, 8 and 9 to downlink communication;

assigning subframes 2, 3 and 4 to uplink communication;

upon receiving a downlink grant in subframe 0, the user equipment transmitting a responsive ACK/NAK signal in subframe 4;

upon receiving a downlink grant in subframe 1, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 5, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 6, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 7, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 8, the user equipment transmitting a responsive ACK/NAK signal in subframe 3 of the next frame;

upon receiving a downlink grant in subframe 9, the user equipment transmitting a responsive ACK/NAK signal in subframe 3 of the next frame.

7. A method of responding to a downlink grant in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 4, 5, 6, 7, 8 and 9 to downlink communication;

assigning subframes 2 and 3 to uplink communication;

upon receiving a downlink grant in subframe 0, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 1, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 4, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 5, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 6, the user equipment transmitting a responsive ACK/NAK signal on subframe 3 of the next frame;

upon receiving a downlink grant in subframe 7, the user equipment transmitting a responsive ACK/NAK signal in subframe 3 of the next frame;

upon receiving a downlink grant in subframe 8, the user equipment transmitting a responsive ACK/NAK signal in subframe 3 of the next frame;

upon receiving a downlink grant in subframe 9, the user equipment transmitting a responsive ACK/NAK signal in subframe 3 of the next frame.

8. A method of responding to a downlink grant in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 3, 4, 5, 6, 7, 8 and 9 to downlink communication;

assigning subframe 2 to uplink communication;

upon receiving a downlink grant in subframe 0, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 1, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 4, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 5, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 6, the user equipment transmitting a responsive ACK/NAK signal on subframe 2 of the next frame;

upon receiving a downlink grant in subframe 7, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 8, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 9, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame.

9. A method of responding to a downlink grant in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 5, 6 and 9 to downlink communication;

assigning subframes 2, 3, 4, 7 and 8 to uplink communication;

upon receiving a downlink grant in subframe 0, the user equipment transmitting a responsive ACK/NAK signal in subframe 7;

upon receiving a downlink grant in subframe 1, the user equipment transmitting a responsive ACK/NAK signal in subframe 8;

upon receiving a downlink grant in subframe 5, the user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant in subframe 6, the user equipment transmitting a responsive ACK/NAK signal on subframe 3 of the next frame;

upon receiving a downlink grant in subframe 9, the user equipment transmitting a responsive ACK/NAK signal in subframe 4 of the next frame.

10. A method of responding to a downlink grant or an ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 5 and 6 to downlink communication;

assigning subframes 2, 3, 4, 7, 8 and 9 to uplink communication;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 0, a user equipment transmitting uplink data in subframes 4 or 7;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 1, a user equipment transmitting uplink data in subframe 8;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 5, a user equipment transmitting uplink data in subframe 9 or subframe 2 of the next frame;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 6, a user equipment transmitting uplink data in subframe 3 of the next frame.

11. A method of responding to a downlink grant or an ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 5 and 6 to downlink communication;

assigning subframes 2, 3, 4, 7, 8 and 9 to uplink communications

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 0, a user equipment transmitting uplink data in subframe 4;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 1, a user equipment transmitting uplink data in subframes 7 or 8;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 5, a user equipment transmitting data in subframe 9 or subframe 2 of the next frame;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 6, a user equipment transmitting uplink data in subframes 2 or 3 of the next frame;

upon, a user equipment transmitting uplink data in subframes 2, 3, 4, 7, 8 or 9.

12. A method of responding to a downlink grant or an ACK/NAK on PHICH in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 1, 4, 5, 6 and 9 to downlink communication;

assigning subframes 2, 3, 7 and 8 to uplink communication;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 1, a user equipment transmitting uplink data in subframe 7;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 4, a user equipment transmitting uplink data in subframe 8;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 6, a user equipment transmitting a responsive ACK/NAK signal in subframe 2 of the next frame;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 9, a user equipment transmitting uplink data in subframe 3 of the next frame.

13. A method of responding to a downlink grant or an ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 3 and 8 to downlink communication;

assigning subframes 2 and 7 to uplink communication;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 3, a user equipment transmitting uplink data in subframe 7;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 8, a user equipment transmitting uplink data in subframe 2 of the next frame.

14. A method of responding to a downlink grant or an ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 8 and 9 to downlink communication;

assigning subframes 2, 3 and 4 to uplink communication;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 0, a user equipment transmitting uplink data in subframe 4;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 8, a user equipment transmitting uplink data in subframe 2 of the next frame;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 9, a user equipment transmitting uplink data in subframe 3 of the next frame.

15. A method of responding to a downlink grant or an ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 8 and 9 to downlink communication;

assigning subframes 2 and 3 to uplink communication;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 8, a user equipment transmitting uplink data in subframe 2 of the next frame;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 9, a user equipment transmitting uplink data in subframe 3 of the next frame.

16. A method of responding to a downlink grant or an ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframe 8 to downlink communication;

assigning subframe 2 to uplink communication;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 8, a user equipment transmitting uplink data in subframe 2 of the next frame.

17. A method of responding to a downlink grant or an ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in a wireless user equipment in a time division duplex system using frames including subframes 0 to 9 comprising the steps of:

assigning subframes 0, 1, 5, 6 and 9 to downlink communication;

assigning subframes 2, 3, 4, 7 and 8 to uplink communication;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 0, a user equipment transmitting uplink data in subframe 7;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 1, a user equipment transmitting uplink data in subframe 8;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 5, a user equipment transmitting uplink data in subframe 2 of the next frame;

upon receiving a downlink grant or an ACK/NAK on PHICH on subframe 6, a user equipment transmitting uplink data on subframe 3 of the next frame;

upon receiving a downlink grant or an ACK/NAK on PHICH in subframe 9, a user equipment transmitting uplink data in subframe 4 of the next frame.