Method of providing a fast downlink service in a hard handover in a cellular communication system

• US 20050075108A1
• Filed: 09/27/2004
• Published: 04/07/2005
• Est. Priority Date: 10/01/2003
• Status: Active Grant

• Current Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Original Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Inventors: Park, Chi-Hyun, Lee, Ki-Ho, Pyun, Ki-Hyun, Kwon, Tae-Soo, Cho, Dong-Ho, Lee, In-Sun, Hwang, Pil-Yong, Lim, Ae-Ri, Hwang, Gyung-Ho
• Granted Patent: US 7,636,570 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 36/0069 in case of dual connectivity, e.g. decoupled uplink/downlink
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

A method quickly resuming a downlink service in a hard handover in a cellular mobile communication system. To provide the fast downlink service to an MS during a hard handover from an OBS to an NBS, the NBS receives handover user information from the OBS, and generates an MS temporary ID using the handover user information to identify the MS. If user data is generated for the MS before a connection is established for traffic transmission between the MS and the NBS, the NBS transmits the user data to the MS on an HCCH using the MS temporary ID.

Claims

1. A method of providing a fast downlink service to a mobile station (MS) in a new base station (NBS) during a hard handover from an old base station (OBS) to the NBS in a cellular communication system, comprising the steps of:

receiving handover user information from the OBS;

generating an MS temporary ID (Identification) using the handover user information to identify the MS;

generating user data for the MS before a connection is established for traffic transmission between the MS and the NBS; and

transmitting the user data to the MS on a handover common channel (HCCH) using the MS temporary ID.

2. The method of claim 1, wherein the handover user information includes an ID of the OBS and an ID of the MS.

3. The method of claim 2, wherein the step of generating the MS temporary ID comprises the step of connecting the MS ID to the OBS ID.

4. The method of claim 2, wherein the step of generating the MS temporary ID comprises the step of connecting the MS ID to a difference between the OBS ID and an ID of the NBS.

5. The method of claim 1, wherein the step of transmitting the user data comprises the steps of:

assigning resources for the HCCH;

transmitting HCCH assignment information on a broadcast channel; and

transmitting the user data including the MS temporary ID to the MS on the HCCH.

6. The method of claim 5, wherein the HCCH assignment information includes an HCCH indication bit indicating whether the HCCH is used.

7. The method of claim 6, wherein the HCCH assignment information also includes HCCH resource information.

8. The method of claim 7, wherein the HCCH resource information indicates an amount of user data transmittable on the HCCH.

9. A method of providing a fast downlink service to a mobile station (MS) in a new base station (NBS) during a hard handover from an old base station (OBS) to the NBS in a cellular communication system, comprising the steps of:

receiving handover user information from the OBS;

generating an MS temporary ID (Identification) using the handover user information to identify the MS;

if user data for the MS is generated before a connection is established for traffic transmission between the MS and the NBS, transmitting the user data to the MS on a handover common channel (HCCH) using the MS temporary ID; and

if the user data for the MS is generated after the connection is established for the traffic transmission between the MS and the NBS, transmitting the user data to the MS on a traffic channel.

10. A method of receiving a fast downlink service in a mobile station (MS) during a hard handover from an old base station (OBS) to a new base station (NBS) in a cellular communication system, comprising the steps of:

receiving an ID (Identification) of the NBS from the OBS;

generating an MS temporary ID using the NBS ID and an ID of the MS; and

receiving user data on a handover common channel (HCCH) using the MS temporary ID, until a connection is established for traffic transmission between the MS and the NBS.

11. The method of claim 10, wherein the step of generating the MS temporary ID comprises the step of connecting the MS ID to an ID of the OBS ID.

12. The method of claim 10, wherein the step of generating the MS temporary ID comprises the step of connecting the MS ID to the difference between an OBS ID and the NBS ID.

13. The method of claim 10, wherein the step of receiving the user data comprises the steps of:

receiving HCCH assignment information on a broadcast channel; and

receiving the user data including the MS temporary ID on the HCCH from the NBS.

14. The method of claim 13, wherein the HCCH assignment information includes an HCCH indication bit indicating whether the HCCH is used.

15. The method of claim 14, wherein the HCCH assignment information also includes HCCH resource information.

16. The method of claim 15, wherein the HCCH resource information indicates an amount of user data transmittable on the HCCH.

17. The method of claim 16, further comprising the step of:

determining sub-carriers assigned to the HCCH by the NBS ID and time slots assigned to the HCCH by the HCCH resource information, if the cellular communication system is an orthogonal frequency division multiplexing (OFDM) system.

18. The method of claim 10, further comprising the step of receiving the user data on a traffic channel when the connection is established for the traffic transmission between the MS and the NBS.