Method and apparatus for performing autonomous transmission in a mobile communication system for supporting an enhanced uplink dedicated channel

• US 20060023629A1
• Filed: 07/18/2005
• Published: 02/02/2006
• Est. Priority Date: 07/16/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Sung-Ho, Heo, Youn-Hyoung, Kim, Young-Bum, Kwak, Yong-Jun, Cho, Joon-Young, Lee, Ju-Ho, Kim, Soeng-Hun
• Granted Patent: US 7,756,087 B2
• Time in Patent Office: Days
• US Class Current: 370/235
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS

Abstract

A mobile communication system using an enhanced uplink dedicated transport channel transmits data at a relatively low effective data rate through autonomous transmission. Data transmission time points for user equipments (UEs) have different values in the autonomous transmission and therefore uplink interference is reduced. An autonomous transmission period N and the number of autonomous transmissions k are determined such that each UE performs the autonomous transmission. A Node B and each UE are notified of possible autonomous transmission time points based on the determined autonomous transmission period N and the determined number of autonomous transmissions k through signaling. The UE transmits the uplink data without the Node B'"'"'s scheduling at the possible autonomous transmission time points.

Claims

1. A method for performing autonomous transmission in a user equipment (UE) of a mobile communication system for supporting an enhanced uplink dedicated channel (E-DCH), comprising the steps of:

receiving autonomous transmission information indicating k possible autonomous transmission time points within an autonomous transmission period N;

identifying data to be used for non-scheduled transmission; and

transmitting the identified data through the E-DCH at the k possible autonomous transmission time points within the autonomous transmission period N.

2. The method of claim 1, wherein the autonomous transmission information is configured by N bits and has a bit map indicating the k possible autonomous transmission time points using specific bit values.

3. The method of claim 1, wherein the autonomous transmission information is determined according to an effective data rate and an allowed maximum transmission delay time, the effective data rate being determined by considering at least one of the capacity of UEs for providing an uplink packet data service, requested quality of service (QoS), the number of UEs, and uplink radio resources available in a cell.

4. The method of claim 1, wherein the data to be used for the non-scheduled transmission is defined by a service type or a data rate.

5. The method of claim 1, wherein the identifying step comprises the step of:

determining at least one of the data of a signaling radio bearer (SRB) for transmitting high layer signaling information, the data of a guaranteed bit rate (GBR) service for ensuring a predefined data rate, and the scheduling information as data for performing the non-scheduled transmission.

6. The method of claim 1, wherein the step of transmitting the identified data comprises the step of:

transmitting the itdentified data using a data rate allowed by a radio network controller (RNC) at the possible autonomous transmission time points.

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

computing an autonomous transmission determination value according to a connection frame number (CFN) for identifying a frame to be used in communication with a Node B accessed by the UE and a subframe number; and

transmitting the data in transmission time intervals (TTIs) in which autonomous transmission determination values correspond to values of the possible autonomous transmission time points.

8. The method of claim 7, wherein when a TTI length of the E-DCH is 1/n of a frame length, the autonomous transmission determination value is computed by (CFN*n+Subframe Number) mod N.

9. An apparatus for performing autonomous transmission in a user equipment (UE) of a mobile communication system for supporting an enhanced uplink dedicated channel (E-DCH), comprising:

a receiver for receiving autonomous transmission information indicating k possible autonomous transmission time points within an autonomous transmission period N;

a data buffer for storing data to be transmitted through the E-DCH;

a controller for identifying data to be used for non-scheduled transmission from the data stored in the data buffer; and

a transmitter for transmitting the identified data through the E-DCH at the k possible autonomous transmission time points within the autonomous transmission period N.

10. The apparatus of claim 9, wherein the autonomous transmission information is configured by N bits and has a bit map indicating the k possible autonomous transmission time points using specific bit values.

11. The apparatus of claim 9, wherein the autonomous transmission information is determined according to an effective data rate and an allowed maximum transmission delay time, the effective data rate being determined by considering at least one of the capacity of UEs for providing an uplink packet data service, the requested quality of service (QoS), the number of UEs, and the uplink radio resource available in a cell.

12. The apparatus of claim 9, wherein the data to be used for the non-scheduled transmission is defined by a service type or a data rate.

13. The apparatus of claim 9, wherein the controller determines at least one of the data of a signaling radio bearer (SRB) for transmitting high layer signaling information, the data of a guaranteed bit rate (GBR) service for ensuring a predefined data rate, and the scheduling information as data for performing the non-scheduled transmission.

14. The apparatus of claim 9, wherein the transmitter transmits the identified data using a data rate allowed by a radio network controller (RNC) at the possible autonomous transmission time points.

15. The apparatus of claim 9, wherein the transmitter computes an autonomous transmission determination value according to a connection frame number (CFN) for identifying a frame to be used in communication with a Node B accessed by the UE and a subframe number, and transmits the data in transmission time intervals (TTIs) in which autonomous transmission determination values correspond to values of the possible autonomous transmission time points.

16. The apparatus of claim 15, wherein when a TTI length of the E-DCH is 1/n of a frame length, the autonomous transmission determination value is computed by (CFN*n+Subframe Number) mod N.

17. A method for controlling autonomous transmission of a user equipment (UE) in a radio network controller (RNC) of a mobile communication system for supporting an enhanced uplink dedicated channel (E-DCH), comprising the steps of:

determining an autonomous transmission period N for performing autonomous transmission in the UE, and determining k possible autonomous transmission time points within the autonomous transmission period N by considering an effective data rate for the autonomous transmission; and

transmitting, to the UE, autonomous transmission information indicating the k possible autonomous transmission time points within the determined autonomous transmission period N.

18. The method of claim 17, wherein the determining step comprises the steps of:

determining an effective data rate for the autonomous transmission by considering at least one of the capacity of UEs for providing an uplink packet data service, requested quality of service (QoS), the number of UEs, and uplink radio resource available in a cell;

determining N and k values according to the effective data rate and an allowed maximum transmission delay time; and

determining the autonomous transmission time points that do not overlap between UEs using the N and k values.

19. The method of claim 17, wherein the autonomous transmission information is configured by N bits and has a bit map indicating the k possible autonomous transmission time points using specific bit values.

20. The method of claim 17, wherein the autonomous transmission information is set for the data to be used for non-scheduled transmission according to a service type or a data rate.

21. The method of claim 17, wherein the autonomous transmission information is set for at least one of data of a signaling radio bearer (SRB) for transmitting high layer signaling information, data of a guaranteed bit rate (GBR) service for ensuring a predefined data rate, and scheduling information.

22. An apparatus for controlling autonomous transmission of a user equipment (UE) in a radio network controller (RNC) of a mobile communication system for supporting an enhanced uplink dedicated channel (E-DCH), comprising:

an autonomous transmission parameter determiner for determining an autonomous transmission period N for performing autonomous transmission in the UE, and determining k possible autonomous transmission time points within the autonomous transmission period N by considering an effective data rate for the autonomous transmission; and

a transmitter for transmitting, to the UE, autonomous transmission information indicating the k possible autonomous transmission time points within the determined autonomous transmission period N.

23. The apparatus of claim 22, wherein the autonomous transmission parameter determiner determines an effective data rate for the autonomous transmission by considering at least one of the capacity of UEs for providing an uplink packet data service, the requested quality of service (QoS), the number of UEs, and uplink radio resource available in a cell;

determines N and k values according to the effective data rate and an allowed maximum transmission delay time, and the determines autonomous transmission time points that do not overlap between UEs using the N and k values.

24. The apparatus of claim 22, wherein the autonomous transmission information is configured by N bits and has a bit map indicating the k possible autonomous transmission time points using specific bit values.

25. The apparatus of claim 22, wherein the autonomous transmission information is set for the data to be used for non-scheduled transmission according to a service type or a data rate.

26. The apparatus of claim 22, wherein the autonomous transmission information is set for at least one of data of a signaling radio bearer (SRB) for transmitting high layer signaling information, data of a guaranteed bit rate (GBR) service for ensuring a predefined data rate, and scheduling information.

27. A method for transmitting uplink data in a mobile communication system for supporting an enhanced uplink dedicated channel (E-DCH), comprising the steps of:

transmitting scheduling information about a buffer status indicating an amount of data to be transmitted and uplink transmission power;

receiving at least one of scheduling assignment information based on the scheduling information and autonomous transmission information indicating k possible transmission time points within a transmission period N, where N and k are set in units of E-DCH transmission time intervals (TTIs);

transmitting uplink data according to the scheduling assignment information in mode for Node B controlled scheduling; and

transmitting uplink data at the possible transmission time points according to the autonomous transmission information in autonomous transmission mode.

28. The method of claim 27, wherein the autonomous transmission information is configured by N bits and has a bit map indicating the k possible autonomous transmission time points using specific bit values.

29. The method of claim 27, wherein the autonomous transmission information is determined according to an effective data rate and an allowed maximum transmission delay time, the effective data rate being determined by considering at least one of the capacity of user equipments (UEs) for providing an uplink packet data service, the requested quality of service (QoS), the number of UEs, and the uplink radio resource available in a cell.

30. The method of claim 27, further comprising the step of:

selecting the Node B controlled scheduling mode or the autonomous transmission mode according to a service type or transmission rate of the data.

31. The method of claim 27, wherein the autonomous transmission mode is used for at least one of the data of a signaling radio bearer (SRB) for transmitting high layer signaling information, the data of a guaranteed bit rate (GBR) service for ensuring a predefined data rate, and scheduling information.

32. The method of claim 27, wherein the step of transmitting the uplink data in the autonomous transmission mode comprises the steps of:

computing an autonomous transmission determination value according to a connection frame number (CFN) for identifying a frame to be used in communication with a Node B accessed by the UE and a subframe number; and

transmitting the data in TTIs in which autonomous transmission determination values correspond to values of the possible autonomous transmission time points.

33. The method of claim 32, wherein when a TTI length of the E-DCH is 1/n of a frame length, the autonomous transmission determination value is computed by (CFN*n+Subframe Number) mod N.

34. An apparatus for transmitting uplink data in user equipment (UE) of a mobile communication system for supporting an enhanced uplink dedicated channel (E-DCH), comprising:

a receiver for receiving at least one of scheduling assignment information based on the scheduling information and autonomous transmission information indicating k possible transmission time points within a transmission period N, where N and k are set in units of E-DCH transmission time intervals (TTIs);

a data buffer for storing uplink data to be transmitted through the E-DCH;

a controller for selecting a Node B controlled scheduling mode or an autonomous transmission mode to transmit the data stored in the data buffer; and

a transmitter for transmitting uplink data according to the scheduling assignment information in the mode for the Node B controlled scheduling, and transmitting uplink data at the possible transmission time points according to the autonomous transmission information in the autonomous transmission mode.

35. The apparatus of claim 34, wherein the autonomous transmission information is configured by N bits and has a bit map indicating the k possible autonomous transmission time points using specific bit values.

36. The apparatus of claim 34, wherein the autonomous transmission information is determined according to an effective data rate and an allowed maximum transmission delay time, the effective data rate being determined by considering at least one of the capacity of UEs for providing an uplink packet data service, the requested quality of service (QoS), the number of UEs, and the uplink radio resource available in a cell.

37. The apparatus of claim 34, wherein the controller selects the mode for the Node B controlled scheduling or the autonomous transmission mode according to a service type or transmission rate of the data.

38. The apparatus of claim 34, wherein the autonomous transmission mode is used for at least one of data of a signaling radio bearer (SRB) for transmitting high layer signaling information, data of a guaranteed bit rate (GBR) service for ensuring a predefined data rate, and scheduling information.

39. The apparatus of claim 34, wherein the transmitter computes an autonomous transmission determination value according to a connection frame number (CFN) for identifying a frame to be used in communication with a Node B accessed by the UE and a subframe number, and transmits the data in TTIs in which autonomous transmission determination values correspond to values of the possible autonomous transmission time points.

40. The apparatus of claim 39, wherein when a TTI length of the E-DCH is 1/n of a frame length, the autonomous transmission determination value is computed by (CFN*n+Subframe Number) mod N.