Access scheme for packet data in a digital cellular communication system

• US 6,038,223 A
• Filed: 10/22/1997
• Issued: 03/14/2000
• Est. Priority Date: 10/22/1997
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Hansson, Rolf, Herlitz, Anders, Frid, Lars
• Primary Examiner(s): Patel, Ajit
• Assistant Examiner(s): Pizarro, Ricardo M.
• Application Number:
  US08/955,664
• Time in Patent Office: 874 Days
• Field of Search: 370/347, 370/348, 370/349, 370/458, 370/449, 370/230, 370/235, 370/236, 370/252, 370/329, 370/328, 370/340
• US Class Current: 370/329
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 60/00 Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/06 using polling
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

A new access scheme for a digital radio network for providing packet data access to mobile stations operating within said network. A random access channel (ACH) is provided for control signaling and short data messages between the network and the mobile stations. One or more polling data channels (PDCHs) are provided for larger quantities of data to be sent between the mobile stations and the network. A mobile station seeking access to send data packets contacts the network over the ACH channel, registers for packet access and is assigned a unique flag pattern. The network then sequentially provides to various registered mobiles access to a PDCH channel by sending its flag pattern in a message over the downlink PDCH. When each mobile recognizes its own unique flag pattern it knows that it is then allowed to send a discrete number of packet bursts to the network over the uplink PDCH before access to the PDCH is given to another registered mobile station. This procedure provides shared access to the PDCH channel to each of the mobiles in the network and prevents collisions between the packets of different mobile stations.

Claims

1. A method for providing a packet data access scheme in a digital cellular communications network which comprises:

providing a broadcast control channel (BCCH) over which the network broadcasts control information to mobile stations in the network;

providing a random access channel (ACH) over which the network communicates only control signaling and short data messages between mobile stations and the network;

providing at least one polling data channel (PDCH) over which the network communicates larger quantities of packet data between a mobile station and the network, said at least one PDCH providing dedicated access between said mobile station and the network;

broadcasting messages over said broadcast control channel (BCCH) which indicate the presence and operative parameters of said random access and polling channels to said mobile stations, at least one of said messages including a channel restriction information parameter limiting access of said at least one PDCH to a subset of said mobile stations;

receiving a data registration signal from a mobile station of said subset of said mobile stations on the ACH channel to indicate that said mobile station has data to send to the network over said at least one PDCH, said mobile station recognizing from said channel restriction information parameter that said mobile station is allowed access to said at least one PDCH; and

allocating within the network said at least one PDCH to said mobile station to allow said mobile station to send its data to the network.

2. A method for providing a packet data access scheme in a digital cellular communications network as set forth in claim 1 which also includes:

broadcasting control messages over the downlink of said at least one PDCH, at least one of said control messages including a control flag pattern which indicates that a particular mobile station is allowed to send data over the uplink of said at least one PDCH at that time.

3. A method for providing a packet data access scheme in a digital cellular communications network as set forth in claim 2 which also includes:

allowing said particular mobile station which recognizes its associated control flag pattern in one of said control messages to send a number of bursts of packet data to the network on the uplink of said at least one PDCH and then,

broadcasting from the network a different control message with a different control flag pattern associated with a different mobile station allowing said different mobile station to send packet data bursts to the network.

4. A method for providing a packet data access scheme in a digital cellular communications network as set forth in claim 3 wherein the control flag pattern of each mobile station which is registered with the network is sequentially broadcast within a corresponding one of said control messages so that each registered mobile station is given an approximately equal share of time on the uplink of said at least one PDCH to send its data to the network.

5. A method for providing a packet data access scheme in a digital cellular communications network as set forth in claim 3 wherein said packet data access scheme is used in conjunction with an existing random packet access scheme and employs a similar burst format on both schemes.

6. A method for providing a packet data access scheme in a digital cellular communications network as set forth in claim 3 wherein said packet data access scheme provides dedicated packet access and is used in conjunction with an existing random packet access scheme which includes messages containing a collision control field having collision control bits and wherein the dedicated packet data access scheme maintains a similar general message format as said existing random packet access scheme and sends its control flag pattern bits in said collision control field having said collision control bits in said existing random packet access scheme.

7. A method for providing a packet data access scheme in a digital cellular communications network as set forth in claim 2 wherein:

said control flag pattern comprises a six bit data pattern repeated three times for redundancy.

8. A method for providing a packet data access scheme in a digital cellular communications network as set forth in claim 1 which also includes:

dynamically allocating said at least one PDCH to mobile stations of said subset of mobile stations as a function of the amount of data that each mobile station of said subset of mobile stations has to send to the network.

9. A method for providing a packet data access scheme for use in a digital cellular communications network which includes:

providing a broadcast control channel (BCCH) over which the network broadcasts control information to mobile stations in the network;

providing a random access channel (ACH) over which the network communicates only control signaling and short data messages between mobile stations and the network;

providing at least one polling data channel (PDCH) over which the network communicates larger quantities of data between a mobile station and the network;

broadcasting messages over said broadcast control channel (BCCH) which indicate the presence and operative parameters of said random access and polling channels to said mobile stations;

broadcasting a control message which includes a channel restriction information parameter limiting access of a packet data access scheme providing dedicated access to a subset of said mobile stations, each mobile station of said subset recognizing from said channel restriction information parameter that said each mobile station is allowed access to said packet data access scheme;

sending on said ACH channel a message from the network to a selected mobile station indicating that the network has data to send to said selected mobile station, said message including an allocated PDCH;

sending a channel allocation acknowledgment on said allocated PDCH channel from said selected mobile station to the network indicating that said selected mobile station is ready to receive data from the network; and

sending data packets between the network and said selected mobile station over said allocated PDCH channel.

10. A method for providing a packet data access scheme in a digital cellular communications network as set forth in claim 9 wherein said selected mobile station is initially in a packet standby state which also includes the additional steps of:

paging said selected mobile station, and

obtaining a terminating condition report from said selected mobile station prior to sending a PDCH allocation message from the network to said selected mobile station.

11. A system for providing a packet data access scheme for use in a digital cellular communications network which comprises:

means for providing a broadcast control channel (BCCH) over which the network broadcasts control information to mobile stations in packet data mode;

means for providing a random access channel (ACH) over which the network communicates only control signaling and short data messages between a subset of mobile stations and the network;

means for providing at least one polling data channel (PDCH) over which the network communicates larger quantities of data between a mobile station and the network, said at least one PDCH providing dedicated access between said mobile station and the network;

means for broadcasting messages over said broadcast control channel (BCCH) which indicate the presence and operative parameters of said random access and polling channels to said mobile stations, at least one of said messages including a channel restriction information parameter limiting access of said at least one PDCH to said subset of said mobile stations;

means for receiving a data registration signal from a mobile station of said subset of mobile stations on the ACH channel to indicate that said mobile station has data to send to the network over said at least one PDCH, said mobile station recognizing from said channel restriction information parameter that said mobile station is allowed access to said at least one PDCH; and

means for allocating said at least one PDCH to said mobile station to allow said mobile station to send its data to the network.

12. A system for providing a packet data access scheme in a digital cellular communications network as set forth in claim 11 which also includes:

means for broadcasting control messages over the downlink of said at least one PDCH, at least one of said control messages including a control flat pattern which indicates that a particular mobile station is allowed to send data over the uplink of said at least one PDCH at that time.

13. A system for providing a packet data access scheme in a digital cellular communications network as set forth in claim 12 which also includes:

means for allowing said particular mobile station which recognizes its associated control flag pattern in one of said control messages to send a number of bursts of packet data to the network on the uplink of said at least one PDCH and then,

means for broadcasting from the network a different control message with a different control flag pattern associated with a different mobile station allowing said different mobile station to send packet data bursts to the network.

14. A system for providing a packet data access scheme in a digital cellular communications network as set forth in claim 13 wherein the control flag pattern of each mobile station which is registered with the network is sequentially broadcast within a corresponding one of said control messages so that each registered mobile station of said subset of mobile stations is given an approximately equal share of time on the uplink of said at least one PDCH to send its data to the network.

15. A system for providing a packet data access scheme in a digital cellular communications network as set forth in claim 13 wherein said packet data access scheme is used in conjunction with an existing random packet access scheme and employs a similar burst format on both schemes.

16. A system for providing a packet data access scheme in a digital cellular communications network as set forth in claim 13 wherein said packet data access scheme provides dedicated packet access and is used in conjunction with an existing random packet access scheme which includes messages containing a collision control field having collision control bits and wherein the dedicated packet data access scheme maintains a similar general message format as said existing random packet access scheme and sends its control flag pattern bits in said collision control field having said collision control bits in said existing random packet access scheme.

17. A system for providing a packet data access scheme in a digital cellular communications network as set forth in claim 12 wherein:

said control flag pattern comprises a six bit data pattern repeated three times for redundancy.

18. A system for providing a packet data access in a digital cellular communications network as set forth in claim 11 which also includes:

means for dynamically allocating said at least one PDCH to mobile stations of said subset of mobile stations depending upon the amount of data that each mobile station of said subset of mobile stations has to send to the network.

19. A system for providing a packet data access scheme for use in a digital cellular communications network which includes:

means for providing a broadcast control channel (BCCH) over which the network broadcasts control information to mobile stations in the network;

means for providing a random access channel (ACH) over which the network communicates only control signaling and short data messages between a subset of mobile stations and the network;

means for providing at least one polling data channel (PDCH) over which the network communicates larger quantities of data between a mobile station and the network;

means for broadcasting messages over said broadcast control channel (BCCH) which indicate the presence and operative parameters of said random access and polling channels to said mobile stations;

means for broadcasting a control message which includes a channel restriction information parameter limiting access of a packet data access scheme providing dedicated access to said subset of said mobile stations, each mobile station of said subset recognizing from said channel restriction information parameter that said each mobile station is allowed access to said packet data access scheme;

means for sending on said ACH a message from the network to a selected mobile station indicating that the network has data to send to said selected mobile station, said message including an allocated PDCH;

means for sending a channel allocation acknowledgment on said allocated PDCH from said selected mobile station to said network indicating that said selected mobile station is ready to receive data from the network; and

means for sending data packets between the network and said selected mobile station over said allocated PDCH.

20. A system for providing a packet data access scheme in a digital cellular communications network as set forth in claim 19 wherein said selected mobile station is initially in a packet standby state which also includes:

means for paging said selected mobile station, and

means for obtaining a terminating condition report from said selected mobile station prior to sending a PDCH allocation message from the network to said selected mobile station.