Central controller with adaptive message handling characteristics

• US 5,072,444 A
• Filed: 10/23/1989
• Issued: 12/10/1991
• Est. Priority Date: 10/23/1989
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Muppidi, Prabbakar, Breeden, Robert L.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Chin, Wellington
• Application Number:
  US07/425,889
• Time in Patent Office: 778 Days
• Field of Search: 370/82, 370/84, 370/85.7, 370/94.1, 370/95.1, 370/110.1, 379/59, 379/63, 379/56, 379/57, 340/825.44, 340/825.47, 340/825.48, 455/33, 455/34, 455/53, 455/54, 455/56
• US Class Current: 370/235
• CPC Class Codes: H04W 88/185 Selective call encoders for paging networks, e.g. paging centre devices

Abstract

A central controller operating as a pager terminal for receiving, handling, and transmitting messages is shown that adaptively alters its message handling characteristics in order to improve the overall throughput of the central controller. The channel loading characteristics, based upon the time of day, are used in order to vary the limitation of the size of message received by the central controller as well as vary the transmission size and age of messages prior to transmission. Additionally, channel loading may be determined by determining the total size of messages within the central controller. In response to the total size determination, the limitation of the message size received by the controller may be varied. Furthermore, the transmission size and age of messages prior to transmission may be varied in response to the total size determination. The central controller may also adopt these operations in response to the combination of the total size determination and channel loading based upon the time of day characteristics.

Claims

1. A central controller for receiving, handling and transmitting messages comprising:

means for receiving an incoming message, the incoming message having a size based upon the amount of time elasped during the reception of the incoming message;

controlling means for producing a control signal in order to optimize the transmission of the plurality of messages;

limiting means coupled to the receiving means nd responsive to the control signal for limiting the size of the incoming message to a maximum size in response to the control signal, thereby producing a limited message, wherein the maximum size is varied;

transmitting means for transmuting the limited message to a plurality of selective call receivers,

thereby varying the maximum size of messages transmitted to the selective call receivers in order to optimize the transmission of the plurality of messages.

2. A central controller for receiving, handling and transmitting messages comprising:

means for receiving an incoming message, the incoming message having a size based upon the amount of time necessary to transmit the incoming message;

controlling means for producing a control signal in order to optimize the transmission of the plurality of messages;

limiting means coupled to the receiving means and responsive to the control signal for limiting the size of the incoming message to a maximum size in response to the control signal thereby producing a limited message, wherein the maximum size is varied;

transmitting means for transmitting the limited message to a plurality of selective call receivers,

thereby varying the maximum size of messages transmitted to the selective call receivers in order to optimize the transmission of the plurality of messages.

3. A central controller for receiving, handling and transmitting messages comprising:

means for receiving an incoming message, the incoming message having a size, the receiving means having a memory means for holding the incoming message and the size of the incoming message is based upon the amount of memory occupied by the incoming message;

controlling means for producing a control signal in order to optimize the transmission of the plurality of messages;

limiting means coupled to the receiving means and responsive to the control signal for limiting the size of the incoming message to a maximum size in response to the control signal, thereby producing a limited message, wherein the maximum size is varied;

transmitting means for transmitting limited message to a plurality of selective call receivers,

thereby varying the maximum size of messages transmitted to the selective caller receivers in order to optimize the transmission of the plurality of messages.

4. A central controller for receiving, handling and transmitting messages comprising:

means for receiving an incoming message, the incoming message having a size;

controlling means for producing a control signal in order to optimize the transmission of the plurality of messages;

limiting means coupled to the receiving means and responsive to he control signal for limiting the size of the incoming message to a maximum size in response the control signal, hereby producing a limited message, wherein the maximum size is varied, wherein limiting the size of the incoming message includes truncating the incoming messages;

transmitting means for transmitting the limited message to a plurality of selective call receivers,

thereby varying the maximum size of messages transmitted to the selective caller receivers in order to optimize the transmission of the plurality of messages.

5. A central controller for receiving, handling and transmitting messages comprising:

means for receiving an incoming message, the incoming message having a size;

controlling means for producing a control signal in order to optimize the transmission of the plurality of messages;

limiting mean coupled to the receiving means and responsive to the control signal for limiting the size of the incoming message to a maximum size in response to the e control signal, thereby producing a limited message, wherein the maximum size is varied, wherein limiting the size of the incoming message includes selectively removing portions to the incoming message;

transmitting means for transmitting h the limited message to a plurality of selective call receivers,

thereby varying the maximum size of messages transmitted to the selective caller receivers in order to optimize the transmission of the plurality of messages.

6. The central controller of claim 5 wherein the incoming message is an audiomessage having silent portions and limiting the size of the message includes removing the silent portions.

7. A central controller for receiving, handling and transmitting messages comprising:

means for receiving an incoming message, the incoming message having a size;

controlling means for producing a control signal in order to optimize the transmission of the plurality of messages;

limiting means coupled to the e receiving means and responsive to he control signal for limiting the size of the incoming message to a maximum sie in response the controls signal, thereby producing a limited message, wherein the maximum size is varied, wherein the incoming message is received from a sending unit and the receiving means communicates the maximum size of the incoming message to the sending unit;

transmitting means for transmitting the limited message to a plurality of selective caller receivers,

thereby varying the maximum size f messages transmitted to the selective caller receivers index to optimize the transmission of to the plurality of messages.

8. A central controller for receiving, handling and transmitting messages comprising:

means for receiving an incoming message, the incoming message having a size;

controlling means for producing a control signal in order to optimize the transmission of the plurality of messages;

limiting means coupled oh e receiving and and responsive to he control signal for limiting the size of the incoming message to a maximum size in response to the control signal, thereby producing a limited message, wherein the maximum size is varied;

transmitting means for transmitting limited message to a plurally of selective caller receivers, wherein the incoming message is intend for reception by a particular selective call receiver and the control signal si capable of gearing one of a plurality of maximum size signals, and each of the plurality of the selective caller receivers has a corresponding maximum size signal, wherein the control signal generates a maximum size corresponding to the particular selective call receiver;

thereby varying the maximum size of messages transmitted to the selective caller e receivers in order to optimize the transmission the plurality of messages.

9. A central controller for receiving, handling and transmitting messages comprising:

means for receiving an incoming message, the incoming message having a size;

controlling means for producing a control signal in order to optimize the transmissions the plurally of messages;

limiting means coupled oh e receiving means and responsive to the control signal for limiting the size of the incoming message to a maximum size in response to the control signal, thereby producing a limited message, wherein the maximums size is varied;

transmitting means for transmitting the limited message to a plurality of selective call receivers,

thereby varying the maximum size of messages transmitted to the selective call receivers in order to optimize the transmission of the plurality of messages;

a means to generating a time signal indicative to the time of day and day of the week information, thereby varying maximum size of the incoming messages as a function the time of day and the day of the week; and

wherein

the controlling means generates the control signal as a function to the time signal, thereby varying the maximum size of the incoming message as a function of day.

10. The central controller of claim 9 wherein the time signal further includes date information, thereby varying the maximum size the incoming signal as a function of the time of day and the data.

11. A central controller for receiving, handling and transmitting messages comprising:

means for receiving an incoming messages, the incoming message having a size;

controlling means for producing a control signal in order to optimize the transmission of the plurality of messages;

limiting means coupled to the e receiving means and responsive to the control signal for limiting the size of the incoming message to a maximum size in response to the control signal, thereby producing a limited message, wherein the maximum size is varied;

transmitting means for transmitting the limited message to a plurality of selective call receivers,

thereby varying the maximum size of messages transmitted to the selective call receivers in order to optimize the transmission the plurality of messages, wherein the transmitting means transits a plurality of messages and the transmit means includes;

memory mean for holding the plurality of messages wherein the plurality of messages have a total size;

means for generating a size signal indicative to f the total size of the plurality of messages; and

wherein

the controlling means generates the control signal as a function of the size signal, thereby varying the maximum size of the incoming message as a function of the total size of the plurality of messages held within the storage means.

12. The central controller of claim 11 wherein the total size is based upon the amount of memory occupied by the plurality of messages.

13. The central controller of claim 11 wherein the total size is based upon the transmission time of the plurality of messages.

14. The central controller of claim 11 further comprising:

a means for generating a time of day signal; and

wherein

the controlling means generates the control signal as a function of the size signal and the time of day signal, thereby varying the size of the incoming messages as a function of the total size of the plurality of messages held within the storage means and the time of day.

15. A central controller for receiving, handling and transmitting messages comprising:

receiving means for receiving a plurality of messages;

memory means coupled to the receiving means for accumulating the plurality of messages, wherein the plurality of messages have a total size;

measuring means coupled to the memory means for generating a total size signal indicative of the total size of the plurality of messages;

time keeping means for generating a time signal indicative of the time of day.

controlling means responsive to the time signal for generating a maximum size signal as a function of the time signal;

analyzing means responsive to the total size signal and the maximum size signal for generating a transmit signal in response to the total size signal being substantially equal to the maximum size signal; and

transmitting means coupled to the memory means and responsive to the transmit signal for transmitting the plurality of messages within the memory means in response to the transmit signal,

thereby varying the size of the transmission of the plurality of messages by the time of day.

16. The central controller of claim 15 wherein the total size of the plurality of messages within the memory means is based upon the time necessary to transmit the plurality of messages within the memory means.

17. The central controller of claim 15 wherein the total size of the plurality of messages within the memory means is based upon the number of messages within the memory means.

18. The central controller of claim 15 wherein the total size of the plurality of messages within the memory means is based upon the amount of memory occupied by the plurality of messages.

19. The central controller of claim 15 wherein the plurality of messages are transmitted in a batch protocol, wherein the plurality of messages occupy a plurality of batches, each batch having a predetermined number of slots, a slot having either address for message information, and each message having an address portion and a data portion and each message being transmitted within contiguous slots, wherein the address portion of the message may only occur within a predetermined slot within each batch, thereby providing for the possibility of leaving several slots within the plurality of batches vacant of either address or data information, wherein a batch is considered full when the number of slots having address for data information within the batch is greater than a threshold signal and the measuring means determines the size of the plurality of messages based upon the number of full batches.

20. The central controller of claim 18 wherein the controlling means additionally generates the threshold signal as a function of the time of day, and the measuring means being coupled to the controlling means responds to the threshold signal for determining when a batch is full batch, thereby varying the number of vacant slots within a full batch by the time of day.

21. A central controller for receiving, handling, and transmitting message comprising:

receiving means for receiving a plurality of messages;

memory means coupled to the receiving means for accumulating the plurality of messages, wherein the plurality of messages have an age indicative of the time elapsed while the messages are within the memory means;

determining means coupled to the memory means for determining the age of the messages within the memory means and for generating a message age signal in response thereof;

time keeping means for generating a time signal indicative of the time of day;

controlling means responsive to the time signal for generating a maximum age signal as a function of the time signal;

analyzing means responsive to the message age signal and the maximum age signal for generating a transmit signal in response to the message age signal being substantially equal to the maximum age signal; and

transmitting means coupled to the memory means and responsive to the transmit signal for transmitting the plurality of messages within the memory means in response to the transmit signal,

thereby varying the maximum age of the messages within the memory means prior to transmission by the time of day.

22. The central controller of claim 21 wherein the messages within the memory means have a total size and the central controller further comprises:

measuring means coupled to the memory means for generating a total size signal indicative of the total size of the plurality of messages; and

wherein

the controlling means additionally generates a maximum size signal as a function of the time signal; and

the analyzing means being additionally responsive to the total size signal, and the maximum size signal generates a transmit signal in response to the total size signal being substantially equal to the maximum size of the message age signal being substantially equal to the maximum age signal,

thereby transmitting the messages within the memory means either when the maximum size for maximum age is substantially realized, and varying the maximum size and the maximum age as a function of the time of day.

23. The central controller of claim 21 wherein the age of the message within the memory represents the age of the oldest message within the memory means, and the age signal generated by the determining means is indicative of the age of the oldest message.

24. The central controller of claim 21 wherein the age of the messages within the memory is the average age of the messages within the memory means, and the age signal generated by the determining means is indicative of the average message age.

25. A central controller for receiving, handling, and transmitting messages comprising:

receiving means for receiving a message, the message being intended for reception by a selective call receiver, the selective call receiver being capable of receiving a message on a predetermined protocol;

selecting means responsive to the message for selecting a message protocol from a plurality of message protocols, wherein the selected message protocol corresponds to the reception protocol of the selective call receiver;

memory means coupled to the receiving means responsive to the selected message protocol and having a plurality of buffers, wherein each buffer stores a plurality of messages of a like message protocol, wherein the memory means stores the message in a buffer corresponding to the selected message protocol and messages stored within the buffer have a size and the messages within the plurality of buffers have a total size;

measuring means coupled to the receiving means determining the size of the message within the buffer and for generating a buffer size signal in response thereof and for determining the total size of the messages within the plurality of buffers and for generating a total size in response thereof;

controlling means responsive to the total size signal for generating a maximum buffer size signal as a function of the total size signal;

analyzing means responsive to the buffer size signal and the maximum buffer size signal for producing the buffer transmit signal in response to the buffer size signal being substantially equal to the maximum buffer size signal; and

transmitting means coupled to the memory means and responsive to the buffer transmit signal for transmitting the messages within the buffer in response to the buffer transmit signal,

thereby varying the size of the transmission of the messages stored within the buffer as a function of the total size of the messages within the memory means.

26. The central controller of claim 25 further comprising:

time keeping means for generating a time signal indicative of the time of day; and

wherein

the controlling means being additionally responsive to the time signal generates the maximum buffer size signal as a function of the total size signal and the time signal,

thereby varying the size of the transmission of the messages accumulated within the buffer as a function of the total size of the messages within the memory means and the time of day.

27. The central controller of claim 25 further wherein:

the messages within the plurality of batches exclusive of the batch have an intermediate size;

the measuring means additionally determines the intermediate size and generates an intermediate size signal;

the controlling means additionally responsive to the intermediate'"'"'s size signal generates a threshold signal in response thereof; and

the messages stored within the buffer are transmitted in a batch protocol wherein the messages occupy a plurality of batches and each batch as a predetermined number of slots, a slot having either address for message information, and a message having an address portion and a data portion and the message being transmitted within contiguous slots, wherein the address portion of the message may only occur within a predetermined slot within each batch, thereby providing for the possibility of leaving several slots within the plurality of batches vacant of either address for data information, wherein a batch is considered full when the number of vacant slots within the batch is less than a threshold signal and the measuring means determines the size of the plurality of messages as a function of the number of full batches.

28. A central controller for receiving, handling, and transmitting messages comprising:

receiving means for receiving a message, the message being intended for reception by a selective call receiver, the selective call receiving being capable of receiving the message on a predetermined protocol;

selecting means responsive to the message for selecting a message protocol from a plurality of message protocols for the message, wherein the selected message protocol corresponds to the reception protocol of the selective call receiver;

memory means coupled to the receiving means, responsive to the selected message protocol and having a plurality of buffers, wherein each buffer stores a plurality of messages of like message protocol, wherein the memory means stores the message in a buffer corresponding to the selected message protocol and message stored within the buffer have an age indicative of the time elapsed while the messages are within the buffer and further wherein the message within the plurality of buffers have a total size;

determining means coupled to the memory means for determining the age of the messages within the buffer and for generating a buffer age signal in response thereof;

measuring means coupled to the memory means for determining the total size of the messages within the memory means and for generating a total size signal in response thereof;

controlling means responsive to the total size signal for generating a maximum buffer age signal as a function of the total size signal;

analyzing means responsive to the buffer age signal and the maximum buffer age signal for producing the buffer transmit signal in response to the buffer age signal being substantially equal to the maximum buffer age signal; and

transmitting means coupled to the memory means and responsive to the buffer transmit signal for transmitting the messages within the buffer in response to the buffer transmit signal,

thereby varying the maximum age of messages are stored within the buffer prior to transmission as a function of the total size of the messages within the memory means.

29. The central controller of claim 28 further wherein:

the messages within the buffer have a size;

the measuring means additionally determines the size of the messages within the buffer and generates a buffer size signal in response thereof;

the controlling means additionally generates a maximum buffer size signal; and

the analyzing means being addition responsive to the buffer size signal and the maximum buffers size signal and generates the buffer transmit signal in response to the buffer size signal being substantially equal to the maximum buffer size signal,

thereby transmitting the messages within the buffer when the maximum buffer size is substantially realized, for when the maximum time has elapsed, whichever occurs first, and varying the maximum time and maximum size as a function of the total size of the message within the memory means.

30. The central controller of claim 29 wherein the controlling means is responsive to the total size signal and the maximum buffer size signal is generated in response to the total size signal.

31. The central controller of claim 29 wherein the maximum buffer size signal is determined.

32. The central controller of claim 28 wherein the maximum age signal is the product of the total size and the optimization value.

33. The central controller of claim 32 wherein the optimization parameter is predetermined.

34. The central controller of claim 32 further comprising:

time keeping means for generating a time signal indicative of the time of day; and

wherein

the controlling means being additionally responsive to the time signal generates the optimization parameter as a function of the time of day.

35. The central controller of claim 32 further comprising a means for manually varying the optimization parameter.