System and method for queuing and batching messages for wireless transmission

• US 5,686,901 A
• Filed: 10/10/1995
• Issued: 11/11/1997
• Est. Priority Date: 10/10/1995
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Chen, Xuming
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): Beaulieu, Yonel
• Application Number:
  US08/541,400
• Time in Patent Office: 763 Days
• Field of Search: 340/825.44, 340/825.52, 340/825.5, 455/38.1, 455/53.1, 455/54.1, 370/412, 370/413, 370/429, 370/471, 370/312, 370/313, 370/314, 370/461, 375/316, 379/56, 379/57
• US Class Current: 340/7.43
• CPC Class Codes: H04W 88/185 Selective call encoders for paging networks, e.g. paging centre devices

Abstract

A paging controller (10) assigns pages to particular batch positions utilizing a metric that minimizes the gaps between messages in a batch so as to increase the efficiency and throughput of the system. The controller (10) stores information representing messages that are received for transmission in a queue (31-38) having the same associated frame number as the frame number of the message. A metric value representing a distance between an end of a message, if it is placed in a batch starting at a position associated with the message'"'"'s frame number, and a subsequent batch position is calculated for the received messages identified in the queues (31-38). Messages are assigned to positions in the batches based upon the shortest calculated distance value so as to substantially minimize the gaps between adjacent messages in the batches.

Claims

1. A controller for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device, each message being associated with a frame number and each batch having a plurality of positions each associated with a predetermined frame number, said controller comprising:

a memory for storing information in a plurality of queues, each queue being associated with a predetermined frame number and storing information representing received messages having the same associated frame number;

a processor for calculating a plurality of distance values, each of said values representing a distance between an end of a message, if it is placed in a batch starting at a position associated with said message'"'"'s frame number, and a subsequent batch position having a frame number of an unempty queue, said processor assigning messages to the positions of said batches based upon which of said calculated distance values is the shortest, and wherein said processor determines whether there are a plurality of calculated values representing the same shortest distance and if so, said processor compares the queues having the frame numbers associated with the batch positions for which said same shortest distance was calculated to assign a message based upon which of said compared queues stores information representing the greatest number of messages.

2. A controller for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 1 wherein said received messages include a priority message and said processor assigns said priority message to a position of a batch having the same associated frame number as said priority messages and thereafter determines distance values for messages identified in queues having an associated frame number that is less than the frame number of said priority message to assign the message having the smallest determined distance from the end thereof to the batch position of said priority message.

3. A controller for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 1 wherein said received messages include a priority message and said processor calculates a value representing a distance between the end of a message and a subsequent batch position having the same associated frame number as said priority message, said processor assigning messages to the frame positions based upon the shortest distance to a priority message.

4. A controller for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 1 wherein each of said messages is formed of a plurality of code words, each frame number is associated with a plurality of code word batch positions and said processor calculates said distance value as equal to ##EQU3## where N represents the number of frames in a batch, f₁ represents the frame number associated with a first message, l₁, represents the length of the first message in code words, δ

represents a starting code word position of said first message, and f₂ represents the frame number associated with a batch position for which the distance between the end of said first message and said batch position is being calculated.

5. A controller for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 1 wherein said messages are pages.

6. A method for assigning to a plurality of batches, priority and non-priority messages of variable length received for wireless transmission to a selective call receiving device, each message being associated with a frame number and each batch having a plurality of positions each associated with a predetermined frame number, said method comprising:

storing information in a plurality of queues, each queue being associated with a predetermined frame number and storing information representing received messages having the same associated frame number;

assigning a first priority message having the lowest associated frame number to a starting batch position having the same associated frame number;

determining a distance value for messages in said queues having an associated frame number that is less than said frame number of said priority message, each of said distance values representing the distance from an end of a message, if it is placed in a batch starting at a position associated with said message'"'"'s frame number, to said starting batch position of said first priority message; and

assigning a message having a shortest determined distance to a batch position preceding said priority message starting batch position and having the same associated frame number as the frame number of the assigned message.

7. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 6 further including the steps of

finding a first queue with at least one message therein, said first queue having a frame number that is the closest to the first available batch position following an end of said first priority message;

calculating a distance value for messages identified in said first queue, each distance value being measured from an end of a message, if placed in a batch starting at a position associated with said first queue'"'"'s frame number, to each batch position having a frame number of another priority message identified in said queues; and

assigning to the batch position with the first queue'"'"'s frame number the message identified in said first queue and having a smallest calculated distance value.

8. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 7 further including the step of assigning a priority message identified in the queue having the frame number of the batch position to which the smallest distance was calculated for the assigned message identified in said first queue.

9. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 7 wherein said steps of assigning the message identified in said first queue includes the steps of determining whether there are a plurality of calculated values representing the same shortest distance and if so;

comparing the number of messages identified in each of said queues having frame numbers of the batch positions for which said same shortest distance value was calculated to determine which of said queues stores information representing the greatest number of messages; and

assigning the message identified in said first queue having the shortest distance to the batch position with the frame number of the queue determined to store information representing the greatest number of messages.

10. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 6 further including the steps of

finding a first queue with at least one message therein, said first queue having a frame number that is the closest to the first open batch position following an end of said first priority message;

calculating a distance value for messages identified in said first queue, each distant value being measured from an end of a message, if placed in a batch starting at a position associated with said first queue'"'"'s frame number, to a batch position having a frame number of another message identified in a queue; and

assigning to the batch position with the first queue'"'"'s frame number the message identified in said first queue and having a smallest calculated distance to a batch position having a frame number of another message identified in a queue.

11. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 10 wherein said steps of assigning the message identified in said first queue includes the steps of determining whether there are a plurality of calculated values representing the same shortest distance and if so;

comparing the number of messages identified in each of said queues having frame numbers of the batch positions for which said same shortest distance value was calculated to determine which of said queues stores information representing the greatest number of messages; and

assigning the message identified in said first queue having the shortest distance to the batch position with the frame number of the queue determined to store information representing greatest number of messages.

12. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 6 wherein each of said messages is formed of a plurality of code words, each frame number is associated with a plurality of code word batch positions and said calculating step includes calculating said distance value as equal to ##EQU4## where N represents the number of frames in a batch, f₁ represents the frame number associated with a first message, l₁ represents the length of the first message in code words, δ

represents a starting code word position of said first message, and f₂ represents the frame number associated with a batch position for which the distance between the end of said first message and said batch position is being calculated.

13. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 12 wherein the first message starts at a code word batch position that is offset from a first code word batch position associated with the frame of the first message and δ

is set equal to said offset.

14. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 6 wherein said message is a page.

15. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device, each message being associated with a frame number and each batch having a plurality of positions each associated with a predetermined frame number, said controller comprising:

storing information in a plurality of queues, each queue being associated with a predetermined frame number and storing information representing received messages having the same associated frame number;

calculating, for each of a plurality of messages represented by information in said queues, a value representing a distance between an end of a message, if it is placed in a batch starting at a position associated with said message'"'"'s frame number, and a subsequent batch position having a frame number of an unempty queue; and

assigning messages to the frame positions of said batches based upon which of said calculated distance values is the shortest, said assigning step includes the steps of;

determining whether there are a plurality of calculated values representing the same shortest distance and if so;

comparing the queues having the frame numbers associated with the batch positions for which said same shortest distance was calculated to determine which of said queues stores information representing the greatest number of messages; and

assigning a message based upon which of said compared queues stores information representing the greatest number of messages.

16. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 15 wherein each of said messages is formed of a plurality of code words, each frame number is associated with a plurality of code word batch positions and said calculating step includes calculating said distance value as equal to ##EQU5## where N represents the number of frames in a batch, f₁ represents the frame number associated with a first message, l₁ represents the length of the first message in code words, δ

represents an offset from a first code word of the frame f₁ to a starting code word position of said first message, and f₂ represents the frame number associated with a batch position for which the distance between the end of said first message and said batch position is being calculated.

17. A method for assigning to a plurality of batches, priority and non-priority messages of variable length received for wireless transmission to a selective call receiving device, each message being associated with a frame number and each batch having a plurality of positions each associated with a predetermined frame number, said method comprising:

storing information in a plurality of queues, each queue being associated with a predetermined frame number and storing information representing received messages having the same associated frame number;

assigning a first priority message having the lowest associated frame number to a starting batch position having the same associated frame number;

assigning one or more priority or non-priority messages from queues having frame numbers that are less than the frame number of said first priority message to batch positions preceding the starting batch position of said first priority message;

finding a first queue with at least one message therein, said first queue having a frame number that is the closest to the first available batch position following an end of said first priority message; and

calculating a distance value for priority and non-priority messages identified in said first queue, each distance value being measured from an end of a message, if placed in a batch starting at a position associated with said first queue'"'"'s frame number, to a batch position having a frame number of another priority message identified in a queue; and

assigning to a batch position with the first queue'"'"'s frame number a message identified in said first queue and having a smallest calculated distance.

18. A method for assigning to a plurality of batches, messages of variable length received for wireless transmission to a selective call receiving device as recited in claim 17 further including the step of assigning a priority message identified in the queue having the frame number of the batch position to which the smallest distance was calculated for the assigned message identified in said first queue.