Method for scheduling packet data transmission

• US 6,091,717 A
• Filed: 05/05/1997
• Issued: 07/18/2000
• Est. Priority Date: 05/05/1997
• Status: Expired due to Term

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Inventors: Honkasalo, Zhi-Chun, Kapadia, Sona, Noneman, John, Liimatainen, Pasi
• Primary Examiner(s): Jung, Min
• Assistant Examiner(s): LEE, CHI HO A
• Application Number:
  US08/851,368
• Time in Patent Office: 1,170 Days
• Field of Search: 370/312, 370/318, 370/320, 370/322, 370/324, 370/328, 370/329, 370/331, 370/332, 370/335, 370/338, 370/348, 370/349, 375/200, 375/202
• US Class Current: 370/329
• CPC Class Codes: H04W 28/12 using signalling between network elements
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 36/00 Hand-off or reselection arrangements
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support

Abstract

In a packet data transmission and reception system a media access control (MAC) message is broadcast by a base station to a plurality of mobile stations. The MAC message contains packet data transmission scheduling information which allows the base station to preemptively control mobile station access to traffic channels in order to maximize the efficiency of packet data transmissions and allow scheduling consideration including priority access, quality of service and maximum bytes per transfer. The MAC message consists of a control frame structure which comprises scheduling parameters including MAC IDs fields, activity fields, and a field representing the number of free traffic channels in a cell. These parameters enable multiple mobile stations to share, in a time multiplexed fashion, traffic channels for packet data transmission on CDMA based mobile communication systems.

Claims

1. A method for transmitting packet data from a plurality of mobile stations to a base station, comprising the steps of:

broadcasting media access control (MAC) information from the base station to the plurality of mobile stations for simultaneous reception by the plurality of mobile stations, wherein the MAC information comprises a MAC control frame structure for conveying packet data transmission scheduling information, the MAC control frame structure including a plurality of activity fields, one activity field for each active packet data mobile station within a cell, a Next MAC ID field which specifies the identification of a mobile station to be given traffic channel access in a next time slot, and a #Free Channel field which specifies a number of available traffic channels for packet data service at the base station;

receiving the broadcast MAC information at the plurality of mobile stations; and

for a mobile station specified in the MAC information, transmitting packet data to the base station at a time specified by the MAC information.

2. A method as in claim 1, wherein a set of the mobile stations transmit their respective packet data over a same traf fic channel at dif ferent times, as specified by the MAC information.

3. A method as in claim 1, wherein the step of broadcasting uses a dedicated MAC channel.

4. A method as in claim 1, wherein the base station transmits packet data destined for the mobile station on a forward link at the same time the mobile station transmits packet data on the reverse link.

5. A method as in claim 1, wherein the identification of the mobile station is by a temporary number (MAC ID) that is assigned to the mobile station by the base station.

6. A method as in claim 1, wherein transmissions of packet data from the mobile station to the base station are preemptively controlled and scheduled by the base station.

7. A method as in claim 1, wherein the base station transmits MAC information to a specific mobile station using a permuted electronic serial number (ESN) of the mobile station as a long code mask, and broadcasts MAC information to all mobile stations within a cell using a public long code mask.

8. A method as in claim 1, wherein transmissions between the base station and mobile stations employ spreading codes, a unique spreading code to identify transmissions to each mobile station individually, and a public spreading code to identify a broadcast to all mobile stations.

9. A method as in claim 1, wherein a base station of an original cell and a base station of a new cell both receive a transmission from a mobile station during a transition period from the original cell to the new cell.

10. A cellular communication system, comprising:

a plurality of base stations, each base station having an associated cell;

a plurality of mobile stations located within said cells;

means in each said base station for broadcasting media access control (MAC) information from said base station to mobile stations located within the base station'"'"'s cell, wherein said MAC information comprises a MAC control frame structure for conveying packet data transmission scheduling information, said MAC control frame structure including a plurality of activity fields, one activity field for each active packet data mobile station within said cell, a Next MAC ID field which specifies said identification of said mobile station to be given traffic channel access in a next time slot, and a #Free Channels field which specifies a number of available traffic channels for packet data service at said base station;

each of said mobile stations comprising a receiver for receiving said broadcast MAC information simultaneously with other mobile stations; and

each of said mobile stations further comprising a controller, responsive to said broadcast MAC information, for transmitting packet data from said mobile station to said base station at a time specified by the received MAC information.

11. A system as in claim 10, wherein a set of said mobile stations transmit their respective packet data over a same traffic channel at different times, as specified by said MAC information.

12. A system as in claim 10, wherein said means for broadcasting uses a dedicated MAC channel.

13. A system as in claim 10, wherein said receiver receives a dedicated MAC channel using a predefined spreading code.

14. A system as in claim 10, wherein said base station transmits packet data destined for said mobile station on a forward link at the same time said mobile station transmits packet data on the reverse link.

15. A system as in claim 10, wherein transmissions of packet data from said mobile station to said base station are preemptively controlled and scheduled by said base station.

16. A system as in claim 10, wherein said base station transmits MAC information to a specific mobile station using a permuted electronic serial number (ESN) of said mobile station as a long code mask, and broadcasts MAC information to all mobile stations within a cell using a public long code mask.

17. A system as in claim 10, wherein transmissions between said base station and said mobile stations employ spreading codes, a unique spreading code to identify transmissions to each mobile station individually, and a public spreading code to identify a broadcast to all mobile stations.

18. A system as in claim 10, wherein said base station of an original cell and said base station of a new cell temporarily receives a transmission from said mobile station during a transition period from the original cell to a new cell.

19. The system of claim 10, wherein the identification of the mobile station is by a temporary number (MAC ID) that is assigned to the mobile station by the base station.