Data transmission method in a TDMA mobile communication system

• US 6,240,079 B1
• Filed: 06/30/1997
• Issued: 05/29/2001
• Est. Priority Date: 09/27/1994
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Honkasalo, Zhi-Chun, Jokinen, Harri, Hamalainen, Jari, Vainikka, Jari, Posti, Harri
• Primary Examiner(s): VINCENT, DAVID ROBERT
• Application Number:
  US08/817,331
• Time in Patent Office: 1,429 Days
• Field of Search: 370/468, 370/329, 370/346, 370/347, 370/348, 370/330, 370/336, 370/337, 370/335, 370/342, 370/321, 370/322, 455/516, 455/414, 455/452, 455/553, 375/216
• US Class Current: 370/337
• CPC Class Codes: H04J 3/1647 Subrate or multislot multiplexing
• CPC Class Codes: H04J 3/1694 Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers Passive Optical Networks H04Q11/0062
• CPC Class Codes: H04J 3/247 ATM or packet multiplexing
• CPC Class Codes: H04L 47/2425 for supporting services specification, e.g. SLA
• CPC Class Codes: H04L 47/70 Admission control; Resource allocation
• CPC Class Codes: H04L 47/767 after changing the attachment point, e.g. after hand-off
• CPC Class Codes: H04L 47/822 Collecting or measuring resource availability data
• CPC Class Codes: H04L 47/824 Applicable to portable or mobile terminals
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 28/24 Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
• CPC Class Codes: H04W 36/00 Hand-off or reselection arrangements
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 76/10 Connection setup

Abstract

In a cellular communication system, multiple TDMA time slot channels may be assigned to a single mobile station. The network may dynamically adjust, during a call, the number of channels assigned to any one mobile station based on resources available to the network and based on a level of service desired by the mobile station. In this manner, mobile stations having varying bandwidth requirements can be efficiently served by a single communication system.

Claims

1. A method for data transmission in a time division multiple access (TDMA) mobile communication system, in which one or more time-slot channels may be allocated to a mobile station for data transmission, comprising:

determining a desired level of service for the mobile station during a data call,

dynamically adjusting a number of time slots per a TDMA frame assigned to the mobile station during the data call within limits of said desired level of service, the dynamic adjusting comprising;

detecting that there are time-slot resources available in a cell,

detecting in the cell at least one data call, an assigned number of time slots per frame of which fails to meet said desired level of service,

allocating said at least one data call to a configuration having a higher number of time slots,

sending from a base station system to the mobile station a handover command message or an additional channel assignment message including information on the allocated channel configuration in the cell.

2. A method as claimed in claim 1, further comprising:

indicating said desired level of service in terms of a maximum requirement for a data transfer rate of the mobile station or a time slot configuration of the data call.

3. A method as claimed in claim 1, further comprising:

indicating said desired level of service in terms of a maximum requirement and a minimum requirement for a data transfer rate of the mobile station or a time slot configuration of the data call.

4. A method as claimed in claim 1, further comprising:

adjusting configurations assigned to the data call so that a mobile communication network simultaneously serves as many requested connections as possible while keeping the number of channels assigned to the data call as high as possible within the limits of said desired level of service.

5. A method as claimed in claim 1, further comprising:

increasing the number of channels assigned to the data call, after a call set-up or a handover, as soon as there are adequate resources available in a serving mobile communication network, such that said desired level of service of the data call is obtained.

6. A method as claimed in claim 1, wherein said resources of a mobile communication network comprise at least the time-slot resources of a serving cell and/or the time-slot resources of a target cell for handover.

7. A method as claimed in claim 1, further comprising:

the mobile station indicating a maximum desired level of service, and a mobile communication network selecting a minimum level of service.

8. A method for data transmission in a time division multiple access (TDMA) mobile communication system, in which one or more time-slot channels may be allocated to a mobile station for data transmission, comprising:

determining a desired level of service for the mobile station during a data call,

dynamically adjusting a number of time slots per frame assigned to the mobile station during the data call within limits of said desired level of service, the dynamic adjusting comprising;

detecting a shortage of free time-slots in a cell,

detecting in the cell at least one data call, the desired service level of which allows a channel configuration having a lower number of time slots per frame than a current channel configuration assigned to said at least one data call,

allocating said at least one data call to the lower channel configuration,

sending from a base station system to the mobile station a handover command message or an additional channel assignment message including information on the allocated channel configuration in the same cell.

9. A method as claimed in claim 8, further comprising:

decreasing the number of channels assigned to the data call, after a call set-up or a handover, wherein resources in a mobile communication network are released.

10. A time division multiple access (TDMA) mobile communication system, in which one or more time-slot channels may be allocated to a mobile station for data transmission, wherein:

the mobile communication system is arranged to dynamically adjust a channel configuration including one or more time slots per a TDMA frame assigned to the mobile station for a data call, the channel configuration being adjusted within limits of a desired level of service of said data call based on a varying allocation state of resources of the mobile communication system.

11. A system as claimed in claim 10, wherein an indication of said desired level of service is in terms of a maximum requirement for a user data transfer rate or a time slot configuration of the data cell.

12. A system as claimed in claim 10, wherein an indication of said desired level of service is in terms of a maximum requirement and a minimum requirement for a user data transfer rate or a time slot configuration of the data call.

13. A system as claimed in claim 10, wherein a minimum level of service is undefined by the mobile station.

14. A system as claimed in claim 10, wherein a minimum level of service is selectable by the mobile communication system.

15. A system as claimed in claim 10, wherein said resources of the mobile communication system include at least the time-slot resources of a serving cell and/or the time-slot resources of a target cell for handover.