Apparatus and method for conveying information in a communication network

• US 5,363,404 A
• Filed: 07/13/1993
• Issued: 11/08/1994
• Est. Priority Date: 07/13/1993
• Status: Expired due to Fees

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Kotzin, Michael D., Bruckert, Eugene J.
• Primary Examiner(s): Cain, David C.
• Application Number:
  US08/091,147
• Time in Patent Office: 483 Days
• Field of Search: 375/1, 455/56.1, 455/54.1, 380/34, 379/61, 379/63
• US Class Current: 370/335
• CPC Class Codes: H04J 3/0632 Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES] queuing arrangements in packet switching elements H04L49/90; synchronising systems for the synchronous transmission of a pulse code modulated video signal with one or more other pulse code modulated signals H04N7/56
• CPC Class Codes: H04J 3/0682 by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
• CPC Class Codes: H04J 3/1688 the demands of the users being taken into account after redundancy removal, e.g. by predictive coding, by variable sampling reducing bandwidth of signals in general H04B1/66; in PCM-systems H04B14/046; removal of redundancy in telegraph communication H03M7/30
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A direct sequence code-division multiple access (DS CDMA) communication system schedules conveyance of blocks (400) of information such that the blocks arrive at a base-site (130) just-in-time for transmission during a discrete frame (301-305) of an air-interface. The DS CDMA communication system implements both circuit switching and packet switching approaches to provide trunking efficiencies while balancing between system loading constraints and time delay of blocks (400) during conveyance.

Claims

1. A communication network comprising:

a base-site for conveying information via an air interface having discrete frame offset timing; and

an interface means, coupled to the base-site, for implementing frame timing related to the discrete frame offset timing of the air interface.

2. The communication network of claim 1 wherein said information is deterministically associated with a particular framing timing of the interface means.

3. A communication network comprising:

a base-site for conveying blocks of information via an air interface having discrete frame offset timing; and

means, coupled to the base-site, for determining which blocks are to be conveyed during which discrete frames and transferring the blocks of information to the base-site in frame timing related to the determination.

4. The communication network of claim 3 wherein the blocks of information further comprise blocks of 10 T1 frames.

5. The communication network of claim 4 wherein the block of 10 T1 frames each have a header appended thereon every 10th frame.

6. A communication network comprising:

a plurality of base-sites for synchronously conveying blocks of information via an air interface having discrete frame offset timing; and

means, coupled to the base-sites, for determining which blocks are to be conveyed during which discrete frames and transferring the blocks of information to the plurality of base-sites in frame timing related to the determination.

7. The communication network of claim 6 wherein the blocks of information further comprise blocks of 10 T1 frames.

8. The communication network of claim 7 wherein the blocks of 10 T1 frames each have a header appended thereon every 10th frame.

9. The communication network of claim 6 wherein the plurality of base-sites further comprise a plurality of code division multiple access (CDMA) base-sites.

10. An interface in a communication network comprising:

means for grouping frames of information into blocks of information;

means for determining when, in time, the blocks of information are to be transmitted over an air interface by a base-site; and

means for sequentially transferring the blocks of information to the base-site in an order based on the determination.

11. A method of mitigating blocking on a communication link, the communication link coupling an interface means and a base-site, the method comprising the steps of:

determining, based on a predetermined number of vocoders transmitting at a given rate, the likelihood of overflow on the link; and

preventing a vocoder, out of the predetermined number of vocoders, from transmitting at the given rate.

12. An apparatus for mitigating blocking on a communication link, the communication link coupling an interface means and a base-site, the apparatus comprising:

means for determining, based on a predetermined number of vocoders transmitting at a given rate, the likelihood of overflow on the link; and

means, at a vocoder out of the predetermined number of vocoders, for transmitting at a rate different than the given rate based on the determined likelihood.

13. The apparatus of claim 12 wherein the given rate further comprises full rate.

14. The apparatus of claim 13 wherein the predetermined number of vocoders transmitting at a given rate further comprises at least 9 vocoders transmitting at full rate.

15. The apparatus of claim 12 wherein the communication link further comprises a T1 link.

16. A method scheduling blocks of information produced by a vocoder at an interface means for transmission by a base-site during discrete frames of an air-interface, the method comprising the steps of:

measuring a delay between a vocoder at the interface means and the base-site and a signal processing time associated with the base-site; and

adjusting a timing of the vocoder to account for the measured delays

whereby the blocks of information arrive at the base-site just-in-time for transmission during a corresponding discrete frame.

17. An apparatus for scheduling transmission of blocks of information, the blocks of information produced by a vocoder at an interface means, the blocks of information to be transmitted by a base-site during discrete frames of an air-interface, the apparatus comprising:

means for measuring a delay between a vocoder at the interface means and the base-site and a signal processing time associated with the base-site; and

means, at the vocoder, for adjusting timing of the vocoder to account for the measured delays

whereby the blocks of information arrive at the base-site just-in-time for transmission during a corresponding discrete frame of the air-interface.

18. The apparatus of claim 17 wherein the scheduling is further utilized to level the load amongst assigned offsets of the corresponding discrete frame of the air-interface.

19. A method of conveying information from an interface means to a base-site in a communication system, the method comprising the steps of:

determining, based on certain characteristics of the communication system, which of a packet switched or circuit switched approach is preferable for information conveyance; and

switching to a packet switched or circuit switched approach based on the determined characteristics of the system.

20. An apparatus for conveying information from an interface means to a base-site in a communication system, the apparatus comprising:

means for determining, based on certain characteristics of the communication system, which of a packet switched or circuit switched approach is preferable for information conveyance; and

means for switching to a packet switched or circuit switched approach based on the determined characteristics of the system.

21. The apparatus of claim 20 wherein the communication system further comprises a direct sequence code-division multiple access (DS CDMA) communication system.

22. The apparatus of claim 21 wherein the certain characteristics further comprise loading characteristics of the DS CDMA communication system.

23. The apparatus of claim 22 wherein said means for switching further comprises means for employing time-shared switching between a combination of circuit switching and packet switching to balance between the loading characteristics of the DS CDMA communication system and time delay minimization in the DS CDMA communication system.