Method and system for UMTS packet transmission scheduling on uplink channels

• US 20020181436A1
• Filed: 03/28/2002
• Published: 12/05/2002
• Est. Priority Date: 04/02/2001
• Status: Active Grant

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Mueckenheim, Jens, Gruhl, Stefan
• Granted Patent: US 7,145,895 B2
• Time in Patent Office: Days
• US Class Current: 370/349
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS
• CPC Class Codes: H04W 72/569 of the traffic information

Abstract

An improved method for packet transmission scheduling and an improved packet transmission scheduling system in mobile telecommunication systems. Both the improved method and the system especially adapted to be used for UMTS systems. A quality of service scheduling of multiple data flows in a mobile telecommunication system is proposed, wherein a priority order of protocol data units (PDU) of multiple data flows with regard to predefined flow'"'"'s quality of service requirements is determined, a serving of the protocol data units (PDU) is performed by dynamically determining transport blocks (TB) to be transmitted by the physical layer (PHY-layer) with regard to the defined priority order and in dependence of allocated radio resource constraints, by assigning to each transport block (TB) a respective associated transport format (TF), and by creating transport block sets (TBS) with the determined transport blocks (TB) to be transmitted by the physical layer (PHY-layer) by using the respective associated transport format (TF) as assigned.

Claims

1. Method of scheduling multiple data flows for quality of service adjustment in a mobile telecommunication system for a transfer of data between the core network (CN) and at least one user equipment (UE) comprising the steps of:

receiving quality of service requirements of each data flow comprising protocol data units (PDU),

determining a priority order of the protocol data units (PDU) to be served for data transmission on a communication channel,

serving the protocol data units (PDU) by dynamically determining transport blocks (TB) to be transmitted by the physical layer (PHY-layer) with regard to the defined priority order and in dependence of allocated radio resource constraints,

assigning to each transport block (TB) a respective associated transport format (TF), and

creating transport block sets (TBS) with the determined transport blocks (TB) to be transmitted by the physical layer (PHY-layer) by using the respective associated transport format (TF) as assigned.

2. Method of claim 1, characterized by linking two schedulers each operating on a different protocol layers, wherein

each protocol data unit (PDU) of a requested data flow to be transmitted is scheduled by the scheduler (PDU-scheduler) on an upper layer regarding pre-definable associated quality of service requirements into a priority list to be served by the scheduler (MAC-scheduler) of a lower layer, and

medium access control is performed by the scheduler (MAC-scheduler) of the lower layer thereby optimizing the system efficiency of data transmission by dynamically operating on the protocol data units (PDU) within the priority list.

3. Method of claim 1, wherein

the step of determining is performed by a first centrally located scheduler (PDU-scheduler),

the steps of serving and assigning is performed by a second centrally located scheduler (MAC-scheduler) and driven by the state of the first scheduler (PDU-scheduler),

the assigned transport format is signaled to a respective user equipment (UE, MS) storing the associated protocol data units (PDU) to be transmitted, and

the step of creating is performed by a third scheduler comprised by said user equipment (UE, MS).

4. Method of claim 2, characterized by creating a virtual protocol data unit (PDU) list to be served by the second scheduler (MAC-scheduler) in that a request for data flow transfer is signaled from a user equipment (UE, MS) to the first scheduler (PDU-scheduler) and the priority order of the protocol data unit (PDU) to be transferred is determined depending on a required data rate and an estimated length of the respective protocol data unit (PDU).

5. Method of claim 1, wherein the serving of the protocol data units (PDU) is performed periodically within scheduling intervals and depends on bandwidth, timing and/or power constraints.

6. Method of claim 1, comprising the adjusting of the transmission power required for a user equipment.

7. Method of claim 1, characterized by ensuring a minimum data transmission power and/or a maximum data transmission power for a user equipment.

8. Method of claim 7, characterized by an adjusting of the transmission power using predefined bit-error-rate requirements, interference estimations and path-loss estimations.

9. Method of claim 1, wherein an overall transmission power (P_limit(intra, inter)) within a cell is dynamically adjusted by taken into consideration the interference of said cell and the transmission impact from said cell towards adjacent cells.

10. Method of claim 9, wherein the adjusting of the overall transmission power (P_limit(intra, inter)) is comprising an adjustment step using the respective current transmission (P_current(intra, inter)) and a used data rate to the overall available data rate ration.

11. Method of claim 9, wherein the overall transmission power (P_limit(intra, inter)) of all active data flows is dynamically adjusted for a cell within limits predefined by respective allocated transmission powers (P_max(inter), P_max(intra)).

12. Method of claim 1, characterized by optimizing the current transmission power (P_current(intra, inter)) within a cell depending on the interference of said cell and the transmission impact from said cell towards adjacent cells and the required quality of service required for the data to be transmitted.

14. System of claim 13 comprising two schedulers each operating on different protocol layers, wherein the scheduler (PDU-scheduler) operating on an upper layer schedules each protocol data unit (PDU) of a requested data flow to be transmitted into a virtual priority list to be served by the scheduler (MAC-scheduler) of a lower layer, and the scheduler (MAC-scheduler) of the lower layer performs medium access control thereby optimizing the system efficiency of data transmission by dynamically operating on the protocol data units (PDU) within the virtual priority list.

15. System of claim 13 comprising at least one transceiver unit having means for storing protocol data units (PDU) to be transmitted and for processing the protocol data units (PDU) in dependent on the scheduling results.

16. System of claim 13 comprising scheduling means for adjusting the transmission power required for a user equipment.

17. System of claim 13 comprising scheduling means for adjusting the transmission power subsequent to the establishment of a communication channel by using the respective previous transmission power and data rate (R_Bi).

18. System of claim 13 comprising scheduling means for monitoring for a cell an intracell interference and an intercell interference for adjusting an overall transmission power (P_limit(intra, inter)) within the limits predefined by allocated transmission powers (P_max(intra), P_max(inter)).

19. System of claim 18 comprising scheduling means for weighting individual data flow'"'"'s quality of service requirements and said monitored intracell and intercell interferences for adjusting the overall transmission power (P_limit(intra, inter)) to an optimal target transmission power (P_target(intra, inter)).

20. System of claim 13 comprising scheduling means for monitoring the throughput without retransmissions and to compare said throughput with a virtual bandwidth depending on an allocated transmission powers (P_max(intra), (P_max(inter)) for adjusting an overall transmission power (P_limit(intra, inter)) within limits predefined by said allocated transmission powers (P_max(intra), P_max(inter)).

21. System of claim 13 comprising scheduling means for ensuring a minimum data transmission power and/or a maximum data transmission power for a user equipment.

22. System of claim 13 characterized in that the scheduler (PDU-scheduler) of the upper layer is operating with timestamps assigning every protocol data unit (PDU) or every data flow.

23. System of claim 13 characterized by a radio network control means comprising two linked schedulers operating on the Logical-Link-Control-layer and on the Medium-Access-Control-Layer, respectively, and by a user equipment comprising a scheduler executing the decision of the scheduler operating on the Medium-Access-Control-Layer.

13. A mobile telecommunication system comprising a transceiver unit having means

for providing a priority order of protocol data units (PDU) of multiple data flows with regard to predefined flow'"'"'s quality of service requirements,

for dynamically scheduling the ordered protocol data units (PDU) in dependence of allocated radio resource constraints,

for assigning to the scheduled protocol data units (PDU) respective associated transport formats, and

for signaling the transport formats to means for creating transport block sets by using the dynamically scheduling results and the respective associated transport formats as assigned.