Method and apparatus for scheduling uplink data transmission for mobile station in soft handover region in a mobile communication system

• US 20060092876A1
• Filed: 11/02/2005
• Published: 05/04/2006
• Est. Priority Date: 11/04/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Heo, Youn-Hyoung, Kim, Young-Bum, Kwak, Yong-Jun, Cho, Joon-Young, Lee, Ju-Ho
• Application Number:
  US11/263,846
• Publication Number:
  US 20060092876A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

A method and apparatus for scheduling uplink data transmission for a UE in a mobile communication system supporting an uplink packet data service are provided. A serving Node B and at least one non-serving Node B are included in an active set of a UE located in a soft handover region. The UE receives a dedicated scheduling grant from the serving Node B by dedicated scheduling and a common scheduling grant from the at least one non-serving Node B, controls an uplink data rate not to exceed a previous uplink data rate during a predetermined validity duration, if the common scheduling grant indicates a rate-down, and transmits uplink data at the controlled uplink data rate.

Claims

1. A method of scheduling uplink data transmission in a user equipment (UE) in a mobile communication system supporting an uplink packet data service, the method comprising the steps of:

receiving, during a communication with a serving Node B and at least one non-serving Node B at a soft handover, a dedicated scheduling grant from the serving Node B by dedicated scheduling and a common scheduling grant from the at least one non-serving Node B;

controlling an uplink data rate not to exceed a previous uplink data rate during a predetermined validity duration, if the common scheduling grant indicates a rate-down; and

transmitting uplink data at the controlled uplink data rate.

2. The method of claim 1, wherein control information transmitted along with the uplink data comprises a rate request bit, and the controlling step comprises the step of setting the rate request bit to a value other than a rate-up.

3. The method of claim 1, further comprising the step of determining the validity duration according to the duration of a transmission time interval (TTI) in which the uplink data is transmitted.

4. The method of claim 1, wherein the common scheduling grant comprises an overload bit indicating whether uplink resources of the at least one non-serving Node B are overloaded.

5. The method of claim 1, further comprising the steps of, if the common scheduling grant does not indicate a rate-down, determining the uplink data rate according to the dedicated scheduling grant and transmitting the uplink data at the determined uplink data rate.

6. The method of claim 5, wherein control information comprises a rate request bit, and the controlling step comprises the step of, if the common scheduling grant does not indicate a rate-down, setting the rate request bit according to the status of the UE.

7. The method of claim 1, further comprising the step of receiving information indicative of the validity duration from a radio network controller (RNC) that controls radio resources of the UE by radio resource control (RRC) signaling.

8. A method of scheduling uplink data transmission for a user equipment (UE) in a Node B in a mobile communication system supporting an uplink packet data service, the method comprising the steps of:

transmitting a dedicated scheduling grant to a UE located in a soft handover region by a dedicated scheduling;

receiving uplink data from the UE, after transmitting the dedicated scheduling grant;

controlling an uplink data rate not to exceed a previous uplink data rate during a predetermined validity duration, if the data rate of the received uplink data is lower than a data rate indicated by the dedicated scheduling grant; and

transmitting a dedicated scheduling grant indicating the controlled uplink data rate to the UE.

9. The method of claim 8, further comprising the step of determining the validity duration according to the duration of a transmission time interval (TTI) in which the uplink data is transmitted.

10. The method of claim 8, further comprising the step of receiving information indicative of the validity duration from a radio network controller (RNC) that controls radio resources of the UE by Node B Application Protocol (NBAP) signaling.

11. An apparatus for scheduling uplink data transmission for a user equipment (UE) in a mobile communication system supporting an uplink packet data service, the apparatus comprising:

a serving Node B and at least one non-serving Node B associated with a soft handover region; and

a UE located in the soft handover region, for receiving a dedicated scheduling grant from the serving Node B by a dedicated scheduling and a common scheduling grant from the at least one non-serving Node B, controlling an uplink data rate not to exceed a previous uplink data rate during a predetermined validity duration, if the common scheduling grant indicates a rate-down, and transmitting uplink data at the controlled uplink data rate.

12. The apparatus of claim 11, wherein control information transmitted along with the uplink data comprises a rate request bit, and the UE sets the rate request bit to a value other than a rate-up.

13. The apparatus of claim 11, wherein the validity duration is determined according to the duration of a transmission time interval (TTI) in which the uplink data is transmitted.

14. The apparatus of claim 11, wherein the common scheduling grant comprises an overload bit indicating whether uplink resources of the at least one non-serving Node B are overloaded.

15. The apparatus of claim 11, wherein if the common scheduling grant does not indicate a rate-down, the UE determines the uplink data rate according to the dedicated scheduling grant and transmits the uplink data at the determined uplink data rate.

16. The apparatus of claim 15, wherein control information comprises a rate request bit, and if the common scheduling grant does not indicate a rate-down, the UE sets the rate request bit according to the status of the UE.

17. The apparatus of claim 11, wherein the UE receives information about the validity duration from a radio network controller (RNC) that controls radio resources of the UE by radio resource control (RRC) signaling.