Method and apparatus for transmitting user data in an HSDPA mobile communication system

• US 20030031119A1
• Filed: 06/17/2002
• Published: 02/13/2003
• Est. Priority Date: 06/16/2001
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Sung-Ho, Kim, Seong-Hun, Lee, Kook-Heui, Lee, Hyeon-Woo, Chang, Jin-Weon
• Application Number:
  US10/173,191
• Publication Number:
  US 20030031119A1
• Time in Patent Office: Days
• US Class Current: 370/200
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 92/12 between access points and access point controllers

Abstract

Transmitting user data in an HSDPA (High Speed Downlink Packet Access) mobile communication system by using an FCS (Fast Cell Selection) technique where an RNC (Radio Network Controller) transmits packet data only to a Node B that is best able to transmit data to a UE (User Equipment) on the downlink.

Claims

1. A method of transmitting user data to a UE (User Equipment) in a mobile communication system where the same RNC (Radio Network Controller) controls a first Node B, which is currently providing a service to the UE, and at least one neighboring Node B, the UE capable of receiving signals from the first Node B and the at least one neighboring Node B, the method comprising the steps of:

establishing a transmission link with a new Node B based on channel status information of the first Node B and the at least one neighboring Node B received from the UE by the RNC;

monitoring the channel statuses of the first Node B and the at least one neighboring Node B and transmitting an identification (ID) of the best cell Node B based on the channel status to the first Node B and the at least one neighboring Node B by the UE;

transmitting a BCSI (Best Cell Switching Indicator) to the RNC by the at least one neighboring Node B if the best cell Node B ID is identical to the ID of one of the at least one neighboring Node B; and

transmitting user data on the transmission link to the best cell Node B being the one of the at least one neighboring Node B by the RNC.

2. The method of claim 1, wherein the new Node B is the one of the at least one neighboring Node B from which the UE receives a signal.

3. The method of claim 1, wherein the channel statuses of the first Node B and the at least one neighboring Node B are estimated by measuring the reception strengths of CPICHs (Common Pilot Channels) received from the first Node B and the at least one neighboring Node B.

4. The method of claim 1, wherein the best cell Node B ID is coded in a BCI (Best Cell Indicator) field of a DPCCH (Dedicated Physical Control Channel).

5. The method of claim 1, wherein upon receipt of the BCI, the RNC transmits user data only to the at least one neighboring Node B being the new best cell Node B, and discontinues transmission to the first Node B being the old best cell Node B.

6. An apparatus for transmitting user data to a UE (User Equipment) in a mobile communication system, comprising:

a first Node B currently providing a service to the UE, the UE for transmitting channel status information of the first Node B and at least one neighboring Node B, monitoring the channel statuses of the first Node B and the at least one neighboring Node B, and transmitting the identification (ID) of the best cell Node B based on the channel status to the first Node B and the at least one neighboring Node B, the at least one neighboring Node B for transmitting a BCSI (Best Cell Switching Indicator) if the best cell Node B ID is identical to the ID of one of the at least one neighboring Node B; and

an RNC (Radio Network Controller) for establishing a transmission line with a new Node B based on the channel status information received from the UE and transmitting user data on the transmission link to the best cell Node B.

7. The apparatus of claim 6, wherein the new Node B is the one of the at least one neighboring Node B from which the UE receives a signal.

8. The apparatus of claim 6, wherein the channel statuses of the first Node B and the at least one neighboring Node B are estimated by measuring the reception strengths of CPICHs (Common Pilot Channels) received from the first Node B and the at least one neighboring Node B.

9. The apparatus of claim 6, wherein the best cell Node B ID is coded in a BCI (Best Cell Indicator) field of a DPCCH (Dedicated Physical Control Channel).

10. The apparatus of claim 6, wherein upon receipt of the BCI, the RNC transmits user data only to the one of the at least one neighboring Node B being the new best cell Node B, and discontinues transmission to the first Node B being the old best cell Node B.