Method for controlling channel access priorities in a frequency hopping local area network

• US 5,513,210 A
• Filed: 12/05/1994
• Issued: 04/30/1996
• Est. Priority Date: 12/05/1994
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Demange, Mark G., Vook, Frederick W., Doss, William K.
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/349,654
• Time in Patent Office: 512 Days
• Field of Search: 375/1, 375/40, 375/107, 375/267, 375/356, 375/200-210, 380/34, 380/49, 380/50, 370/100.1, 370/103
• US Class Current: 375/133
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 1/7156 Arrangements for sequence synchronisation
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for prioritizing data transmissions in a frequency hopping communication system (10) includes defining a predetermined number of time slots at the beginning of a dwell or end of a transmission, each time slot having a duration and a data type, the communication device attempting to transmit data if the data type of the data corresponds to the data type of the slot, the attempt being based on at least one of the first and second assigned probability of transmission values, assigning the second probability of transmission value to the communication device if the attempt succeeds, reassigning the first probability of transmission value to the communication device if the transmission of data is complete.

Claims

1. In a frequency hopping communication system having a plurality of communication devices in communication with each other where data is transmitted in a channel selected from a group of frequencies, the selected frequencies defining a hopping set, transmissions occurring within a predetermined period of time defining a dwell, where an attempted access of the channel occurs based on assigning one of at least a first and a second probability of transmission value to the communication device, a method for prioritizing the data transmissions, the steps comprising:

a) defining a predetermined number of time slots at termination of a data transmission, each time slot having a predetermined duration during which time fragmented data may be transmitted, where each slot has an associated data type;

b) the communication device accessing the channel and transmitting the fragmented data when the data type of the fragmented data corresponds to the data type of the slot;

c) assigning the second probability of transmission value to the communication device when the step of accessing the channel succeeds;

d) reassigning the first probability of transmission value to the communication device when the transmission of the fragmented data is complete; and

e) iteratively repeating step (c) through step (d) where communication devices assigned the second probability of transmission value retain the second probability of transmission value between dwells until the transmission of the fragmented data is complete.

2. The method according to claim 1 wherein the first probability of transmission value is less than the second probability of transmission value such that the communication device assigned the second probability of transmission value has a probability of accessing the channel greater than a user device assigned the first probability of transmission value.

3. The method according to claim 1 wherein the communication device transmitting the fragmented data is assigned a transmission-in-progress status if a portion of the fragmented data was previously transmitted, and is assigned a transmission-not-in-progress status if a portion of the fragmented data was not previously transmitted.

4. The method according to claim 3 wherein at least one of the predetermined time slots is assigned to a communication device having the transmission-in-progress status.

5. The method according to claim 4 wherein at least one of the predetermined time slots correspond to the communication devices having the transmission-in-progress states status while a remainder of the predetermined time slots correspond to the communication devices having the transmission-not-in-progress status.

6. The method according to claim 1 wherein at least one of the predetermined time slots corresponds to data being transmitted by a central controller controlling the communication devices.

7. The method of claim 1 further comprising the step of defining a predetermined number of time slots at a dwell beginning.

8. In a frequency hopping communication system having a plurality of communication devices in communication with each other where data is transmitted in a channel selected from a group of frequencies, the selected frequencies defining a hopping set, transmissions occurring within a predetermined period of time defining a dwell, where an attempted access of the channel occurs based on assigning one of at least a first and a second probability of transmission value to the communication device, a method for prioritizing the data transmissions, the steps comprising:

a) defining a predetermined number of time slots at a dwell beginning, each time slot having a predetermined duration during which time fragmented data may be transmitted, where each slot has an associated data type;

b) the communication device accessing the channel and transmitting the fragmented data when the data type of the fragmented data corresponds to the data type of the slot;

c) assigning the second probability of transmission value to the communication device when the step of accessing the channel succeeds;

d) reassigning the first probability of transmission value to the communication device when the transmission of the fragmented data is complete; and

e) repeating step (c) through step (d) where communication devices assigned the second probability of transmission value retain the second probability of transmission value between dwells until the transmission of the fragmented data is complete.