Method for state transition of mobile terminal

• US 8,184,576 B2
• Filed: 04/29/2008
• Issued: 05/22/2012
• Est. Priority Date: 04/30/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Young-Dae, Chun, Sung-Duck, Park, Sung-Jun, Yi, Seung-June
• Primary Examiner(s): LY, ANH VU H
• Application Number:
  US12/597,042
• Publication Number:
  US 20100118811A1
• Time in Patent Office: 1,484 Days
• Field of Search: None
• US Class Current: 370/328
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states

Abstract

In a wireless mobile communications system, a state transition method of a mobile terminal is provided. The mobile terminal receives downlink data in a first state of the mobile terminal, a state of the mobile terminal keeps in the first state or transits to a second state based on a response message responding to the received downlink data, thereby minimizing an unnecessary state transition of the mobile terminal.

Claims

1. A method for a state transition of a mobile terminal in a wireless communications system, the method comprising:

receiving a downlink data in a first state of the mobile terminal; and

determining whether to keep a state of the mobile terminal in the first state or to change the state of the mobile terminal into a second state according to a response message that responds to the received downlink data,

wherein the response message is an ARQ (Automatic Repeat Request) feedback or a Hybrid ARQ feedback, and

wherein the state of the mobile terminal keeps in the first state when the feedback is a positive response and the state of the mobile terminal changes into the second state when the feedback is a negative response.

2. The method of claim 1, wherein the first state is a CELL_PCH state that allows the mobile terminal to receive the downlink data while performing a DRX (Discontinuous Reception).

3. The method of claim 1, wherein the second state is a CELL_FACH state that allows the mobile terminal to continuously receive the downlink data.

4. The method of claim 1, wherein the downlink data includes at least one RLC PDU (Radio Link Control Protocol Data Unit) and the downlink data is received via a HS-DSCH (High Speed Downlink Shared Channel).

5. The method of claim 1, further comprising:

performing a cell update procedure when the state of the mobile terminal is determined to be changed into the second state.

6. The method of claim 5, wherein the cell update procedure comprises:

transmitting a cell update message; and

receiving a cell update confirm message in response to the cell update message,

wherein the response message is transmitted to a network together with the cell update message.

7. A method for a state transition of a mobile terminal in a wireless communications system, the method comprising:

transmitting a downlink data in a first state of the mobile terminal;

receiving a response message in response to the transmitted downlink data; and

determining whether a state of the mobile terminal is in the first state or a second state according to the received response message,

wherein the response message is an ARQ (Automatic Repeat Request) feedback or a Hybrid ARQ feedback, and

wherein the state of the mobile terminal is determined to be in the first state when the feedback is a positive response and the state of the mobile terminal is determined to be in the second state when the feedback is a negative response.

8. The method of claim 7, wherein the first state is a CELL_PCH state that allows the mobile terminal to receive the downlink data while performing a DRX (Discontinuous Reception) and the second state is a CELL_FACH state that allows the mobile terminal to continuously receive the downlink data.

9. The method of claim 7, wherein the downlink data includes at least one RLC PDU (Radio Link Control Protocol Data Unit) and the downlink data is transmitted via a HS-DSCH (High Speed Downlink Shared Channel).

10. The method of claim 7, wherein the response message is received via a RACH (Random access Channel).