Method and apparatus for receiving control information in wireless connection system

• US 9,867,097 B2
• Filed: 05/30/2013
• Issued: 01/09/2018
• Est. Priority Date: 05/30/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Changhwan, Lee, Yusung, Kim, Youngdae, Lee, Changsoo
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): Hom, Shick
• Application Number:
  US14/894,926
• Publication Number:
  US 20160127960A1
• Time in Patent Office: 1,685 Days
• Field of Search: None
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0096 Indication of changes in allocation
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 36/304 due to measured or perceived resources with higher communication quality
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states

Abstract

The present invention discloses a method and an apparatus for a terminal receiving control information, which includes a modified physical hybrid ARQ indicator channel (PHICH) configuration, through a downlink shared channel (DL-SCH), in a heterogeneous network system comprising a macro cell and a femto cell. The method for the terminal receiving the control information in the heterogeneous network system comprising the macro cell and the femto cell, according to one embodiment of the present invention, comprises the steps of: the terminal accessing the macro cell undergoing a handover to the femto cell; and receiving PHICH reconfiguration information from the femto cell through the downlink shared channel (DL-SCH), when the configuration of the physical hybrid ARQ indicator channel (PHICH) used by the terminal which has undergone the handover is modified.

Claims

1. A method of receiving control information received by a user equipment in a heterogeneous network system including a macro cell and a femto cell, the method comprising:

receiving a first PHICH (physical hybrid-ARQ indicator channel) configuration information on the femto cell from the macro cell;

performing a handover from the macro cell into the femto cell;

configuring a PHICH interval as a first number of OFDM (orthogonal frequency division multiplexing) symbols in accordance with the first PHICH configuration information;

receiving a second PHICH configuration information and offset information indicating a timing of applying the second PHICH configuration information from the femto cell through a downlink shared channel (DL-SCH); and

reconfiguring the PHICH interval as a second number of the OFDM symbols in accordance with the second PHICH configuration information.

2. The method of claim 1, wherein the second PHICH configuration information is received through an MAC (medium access control) control element.

3. The method of claim 1, wherein the offset information is received through an MAC (medium access control) control element.

4. The method of claim 1, wherein the offset information is received through an RRC (radio resource control) message.

5. The method of claim 1, wherein the second PHICH configuration information is received through an RRC (radio resource control) message.

6. The method of claim 1, wherein reception signal strength between the user equipment and the femto cell is lower than reception signal strength between the user equipment and the macro cell and wherein the handover of the user equipment from the macro cell into the femto cell is performed for cell range expansion.

7. The method of claim 1, wherein the downlink shared channel comprises a channel specified for the user equipment.

8. A method of transmitting control information transmitted by a femto cell in a heterogeneous network system including a macro cell and the femto cell, the method comprising:

receiving downlink channel information including a downlink channel signal measurement value from a user equipment handed over from the macro cell;

transmitting PHICH (physical hybrid-ARQ indicator channel) configuration information and offset information indicating a timing of applying the second PHICH configuration information to the user equipment through a downlink shared channel (DL-SCH) when the downlink channel signal measurement value is equal to or smaller than a reference value.

9. The method of claim 8, further comprising:

transmitting the PHICH configuration information to the user equipment through a physical broadcast channel (PBCH) when the downlink channel signal measurement value is greater than the reference value.

10. The method of claim 8, wherein the PHICH configuration information is transmitted through one of an MAC (medium access control) control element and an RRC (radio resource control) message.

11. The method of claim 8, wherein the offset information is transmitted through one of an MAC (medium access control) control element and an RRC (radio resource control) message.

12. A user equipment of receiving control information in a heterogeneous network system including a macro cell and a femto cell, the user equipment comprising:

an RF (radio frequency) unit; and

a processor configured to;

receive a first PHICH (physical hybrid-ARQ indicator channel) configuration information on the femto cell from the macro cell,

perform a handover from the macro cell into the femto cell,

configure a PHICH interval as a first number of OFDM (orthogonal frequency division multiplexing) symbols in accordance with the first PHICH configuration information after the handover,

receive a second PHICH configuration information and offset information indicating a timing of applying the second PHICH configuration information from the femto cell through a downlink shared channel (DL-SCH),

reconfigure the PHICH interval as a second number of the OFDM symbols in accordance with the second PHICH configuration information.

13. A femto cell transmitting control information in a heterogeneous network system including a macro cell and the femto cell, the femto cell comprising:

an RF (radio frequency) unit; and

a processor configured to;

receive downlink channel information including a downlink channel signal measurement value from a user equipment handed over from the macro cell, and

transmit PHICH (physical hybrid-ARQ indicator channel) configuration information and offset information indicating a timing of applying the second PHICH configuration information to the user equipment through a downlink shared channel (DL-SCH) when the downlink channel signal measurement value is equal to or smaller than a reference value.