METHOD AND DEVICE FOR TRANSMITTING DOWNLINK CONTROL SIGNAL IN WIRELESS COMMUNICATION SYSTEM

• US 20130286918A1
• Filed: 12/01/2011
• Published: 10/31/2013
• Est. Priority Date: 12/02/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Kyu Jin, Cho, Han Gyu, Kang, Seung Hyun
• Granted Patent: US 9,313,781 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/02 containing liquids as carriers, diluents or solvents
• CPC Class Codes: A01N 37/02 Saturated carboxylic acids or thio analogues thereof; Derivatives thereof
• CPC Class Codes: A01N 65/22 Lamiaceae or Labiatae [Mint family], e.g. thyme, rosemary, skullcap, selfheal, lavender, perilla, pennyroyal, peppermint or spearmint
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 72/121 for groups of terminals or users
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Provided are a method and a device for transmitting a downlink control signal in a wireless communication system. A base station sets a transmission/reception (Tx/Rx) period (T_SPS) on the basis of the type of a machine to machine (M2M) application, transmits said set Tx/Rx period to an M2M device, and performs a permanent scheduling for said M2M device on the basis of said set Tx/Rx period. Alternatively, the base station transmits a first downlink control signal that is allocated for an M2M group, which includes a plurality of M2M devices, to an M2M device that is included in said M2M group, and transmits, to said M2M device, a second downlink control signal that is specific to and allocated to said M2M device.

Claims

1. A method of performing a persistent scheduling on a machine to machine (M2M) device in a wireless communication system, the method comprising:

setting a transmission/reception (Tx/Rx) cycle T_SPS based on a type of an M2M application,

transmitting the set Tx/Rx cycle to the M2M device, and

performing a persistent scheduling on the M2M device based on the set Tx/Rx cycle.

2. The method of claim 1, wherein the Tx/Rx cycle is negotiated or requested by the M2M device.

3. The method of claim 1, wherein the Tx/Rx cycle is transmitted by L1/L2 control signaling or higher layer signaling.

4. The method of claim 1, wherein the Tx/Rx cycle is updated by higher layer signaling.

5. The method of claim 1, further comprising setting a discontinuous reception (DRX) cycle that is an interval in which the M2M device does not communicate with a base station based on the Tx/Rx cycle.

6. A method of transmitting a downlink control signal in a wireless communication system, the method comprising:

transmitting a first downlink control signal assigned to a machine to machine (M2M) group, comprising a plurality of M2M devices, to an M2M device included in the M2M group, and

transmitting a second downlink control signal, specifically assigned to the M2M device, to the M2M device.

7. The method of claim 6, wherein the first downlink control signal and the second downlink control signal are transmitted through a group downlink control information (DCI) format.

8. The method of claim 7, wherein the group DCI format comprises a user equipment (UE) identification field to identify the M2M device.

9. The method of claim 7, wherein the group DCI format comprises cyclic redundancy check (CRC) masked to an identifier (ID) of the M2M group.

10. The method of claim 7, wherein the group DCI format comprises control information specially assigned to other M2M devices included in the M2M group.

11. The method of claim 6, further comprising configuring a group multicasting DCI format for scheduling group-common multicast information assigned to the M2M group in common.

12. The method of claim 6, wherein the first downlink control signal is a DCI format comprising group-specific resource assignment information, and

the second downlink control signal is determined implicitly or explicitly.

13. A machine to machine (M2M) device in a wireless communication system, the M2M device comprising:

a radio frequency (RF) unit for transmitting or receiving a radio signal; and

a processor connected to the RF unit, and configured for;

receiving a first downlink control signal assigned to an M2M group, comprising a plurality of M2M devices, from a base station,

receiving a second downlink control signal, specifically assigned to the M2M device itself, from the base station, and

transmitting uplink through a channel scheduled based on the first downlink control signal and the second downlink control signal.