Packet data transmission using dynamic channel assignment

• US 5,790,551 A
• Filed: 11/28/1995
• Issued: 08/04/1998
• Est. Priority Date: 11/28/1995
• Status: Expired due to Term

• Current Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Original Assignee: AT&T Wireless Services Incorporated (AT&T, Inc.)
• Inventors: Chan, David Chi-Yin
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): HOM, SHICK C
• Application Number:
  US08/563,816
• Time in Patent Office: 980 Days
• Field of Search: 370/333, 370/337, 370/347, 370/348, 370/419, 370/441, 370/445, 370/458, 370/522, 370/328, 370/338, 375/202, 375/205, 379/201
• US Class Current: 370/458
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

A method for transmitting packetized data in a cellular communication system uses a dynamic channel assignment scheme. In this aspect of the invention a data control channel is used in addition to the data traffic channel. The mobile end system uses the data control channel to send a request for assignment of a channel for transmission of data--such as a particular frequency/time-slot in a TDMA system. The network responds with the identification of a particular channel that may be used for a particular time period to transmit data. In this aspect of the invention there is no dedicated channel that is used for data transmission. Rather, the network determines a channel that will be free for the specified time period and assigns it for data transmission.

Claims

1. A method of sending packetized data over a communication network, comprising:

a) transmitting, over a packet data control channel, a request by a requestor to send packetized data;

b) determining at least one available packet data traffic channel and time interval during which the packetized data may be sent the packet data traffic channel being different from the packet data control channel;

c) transmitting to the requestor, over the packet data control channel, an identification of the at least one available packet data traffic channel and the time interval during which the packetized data may be sent; and

d) transmitting the packetized data from the requestor over the at least one available packet data traffic channel during the time interval.

2. The method of claim 1 wherein the communications network is a cellular network, and the said cellular network determines the at least one available packet data traffic the time interval during which the packetized data may be sent.

3. The method of claim 2 wherein an Mobile Data Base Station MDBS determines the at least one available packet data traffic channel and the time interval during which the packetized data may be sent.

4. The method of claim 2 wherein more than one data packet traffic channel and time interval are identified for transmission of the packetized data.

5. The method of claim 2 wherein a mobile end system transmits the packetized data over the at least one available packet data traffic channel during the time interval.

6. The method of claim 5 wherein at least two mobile end systems transmit the packetized data over the more than one data packet traffic channel and time interval, each mobile end system transmitting on one data packet traffic channel and time interval.

7. The method of claim 5 wherein at least two mobile end systems transmit the packetized data over the more than one data packet traffic channel and time interval, each mobile end system transmitting on one data packet traffic channel and time interval.

8. The method of claim 5 wherein one mobile end system transmits the packetized data over the more than one data packet traffic channel and time interval.

9. The method of claim 2 wherein the packet data control channel is different from the voice control channel.

10. The method of claim 2 wherein the channels are Time Division Multiple Access TDMA channels.

11. The method of claim 2 wherein the channels are Code Division Multiple Access CDMA.

12. The method of claim 2 wherein the channels are Advanced Mobile Phone Service AMPS channels.

13. The method of claim 2 wherein, if the transmitting the packetized data step fails, the packetized data is retransmitted over the at least one available packet data traffic channel without reassignment of another at least one available packet data traffic channel.

14. The method of claim 13 wherein data blocks involved in failed transmissions, and representing the same data, are combined during decoding.

15. The method of claim 14 wherein the combined data blocks are decoded using a bitwise majority vote algorithm.

16. The method of claim 15 wherein the data is decoded by combining at least three failed transmissions.

17. The method of claim 16 wherein on each failed transmission after the second failed transmission, the last three transmissions are combined in the decoding process, until at least five transmissions fail.

18. The method of claim 2 wherein the at least one available data traffic channel is determined, at least in part, based on the contents of a priority field transmitted with the request.

19. A method of transmitting data over unused channels in a Time Division Multiple Access TDMA cellular communications network comprising:

a) transmitting, by a mobile end system, over a reverse packet data control channel, a request to send packetized data;

b) determining in a base station at least one available reverse TDMA traffic channel and time interval during which the packetized data may be sent, the packet data traffic channel being different from the packet data control channel.

c) transmitting, by the base station to the mobile end system, over a forward packet data control channel, the identification of the at least one available reverse TDMA data traffic channel and the time interval during which the data may be sent; and

d) transmitting, by the mobile end system, the packetized date over the at least one available reverse TDMA data traffic channel during the time interval.

20. A method of transmitting data over unused channels in a Time Division Multiple Access TDMA cellular communications network comprising:

a) transmitting by a base station, over a forward packet data control channel, a request to send packetized data;

b) determining in the base station at least one available forward TDMA data traffic channel and time interval during which the packetized data may be sent;

the packet data traffic channel being different from the packet data control channel.

c) transmitting, by the base station, over a forward packet data control channel, the identification of the at least one available forward TDMA data traffic channel and the time interval during which the data may be sent; and

d) transmitting, by the base station, the packetized data over the at least one available forward TDMA data traffic channel during the time interval.