METHOD OF EFFICIENT STATE TRANSITION IN ENHANCED CELL FACH

• US 20080159218A1
• Filed: 12/31/2007
• Published: 07/03/2008
• Est. Priority Date: 12/29/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Dwarakanath, Pradeep
• Application Number:
  US11/967,535
• Publication Number:
  US 20080159218A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 8/24 Transfer of terminal data

Abstract

A method of efficient state transition between CELL_DCH and CELL_FACH states is provided. According to the method, the transmission of configuration data through a physical data channel is reduced by using pre-configuration information or previously received/stored information for state transition. The indication regarding the use of pre-configuration information or previously received/stored information for state transition is conveyed through a high speed shared control channel (HS-SCCH), thus reducing the information sent through a high speed physical data shared channel (HS_PDSCH).

Claims

1. A method for efficient state transition between a CELL_DCH state and CELL_FACH state in Enhanced CELL_FACH, the method comprising the steps of:

a) conveying through a high speed shared control channel (HS-SCCH) one of pre-configuration information and previously received and stored information for state transition; and

b) transitioning the state between the CELL_DCH state and the CELL_FACH state in accordance with the conveyed information.

2. The method as claimed in claim 1, wherein the pre-configuration information is sent using one of CELL UPDATE CONFIRM and RADIO BEARER RECONFIGURATION messages at the beginning of connection establishment

3. The method in claim 1, wherein the pre-configuration information is sent using one of CELL UPDATE CONFIRM and RADIO BEARER RECONFIGURATION messages at the first time when a user equipment (UE) moves from the CELL_FACH state to the CELL_DCH state.

4. The method as claimed in claim 2, further comprising ordering which state the UE has to switch to and an index to the pre-defined configuration to be used in the new state.

5. The method as claimed in claim 1, further comprising:

storing prior F-DPCH and E-RGCH/E-HICH codes in a UE; and

entering the CELL_DCH state using the stored prior F-DPCH and E-RGCH/E-HICH codes which are not reassigned.

6. The method as claimed in claim 1, further comprising:

storing prior F-DPCH and E-RGCH/E-HICH codes stored in a UE;

re-transmitting the F-DPCH and E-RGCH/E-HICH codes when the prior F-DPCH and E-RGCH/E-HICH codes are reassigned; and

entering the CELL_DCH state using the re-transmitted F-DPCH and E-RGCR/E-HICH codes

7. The method as claimed in claim 1, further comprising:

sending 16 F-DPCH and 16 E-HICH/E-RGCH codes to a UE; and

signaling an index of the codes when there is a change in the F-DPCH and E-HICH/E-RGCH codes.

8. The method as claimed in claim 1, further comprising:

detecting a corresponding Cyclic Redundancy Check (CRC) code of a UE, specified by H-RNTI; and

indicating that there is no data carried on HS-PDSCH and a state transition command is communicated in HS-SCCH.