Method and apparatus for channel management in a communication system

• US 6,044,090 A
• Filed: 12/30/1996
• Issued: 03/28/2000
• Est. Priority Date: 12/30/1996
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Shaw, Jannet, Hanks, William, Grau, Alan
• Primary Examiner(s): Patel, Ajit
• Application Number:
  US08/774,341
• Time in Patent Office: 1,184 Days
• Field of Search: 348/6, 348/12, 348/13, 455/3.1, 455/4.1, 455/5.1, 455/6.1, 455/4.2, 370/252, 370/242, 370/343, 370/344, 370/480, 370/485, 370/486, 370/487
• US Class Current: 370/485
• CPC Class Codes: H04J 1/12 Arrangements for reducing cross-talk between channels in line transmission systems H04B3/32; in cables or lines H04B3/26 - H04B3/30
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04N 17/004 for digital television systems
• CPC Class Codes: H04N 21/2385 Channel allocation H04N21/266 takes precedence; Bandwidth allocation H04N21/24 takes precedence ; allocation of channels according to the instantaneous demands of the users in time-division multiplex systems H04J3/1682; admission control, resource allocation in open networks H04L12/5692; arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896; negotiating bandwidth in wireless networks H04W28/16
• CPC Class Codes: H04N 21/2402 Monitoring of the downstream path of the transmission network, e.g. bandwidth available traffic monitoring in data switching networks H04L43/00; monitoring data switching networks utilization H04L43/0876
• CPC Class Codes: H04N 21/2408 Monitoring of the upstream path of the transmission network, e.g. client requests monitoring data switching networks utilization H04L43/0876; scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/4788 communicating with other users, e.g. chatting arrangements for providing for computer conferences, e.g. chat rooms, to substation in data switching networks H04L12/1813; distributed application using peer-to-peer [P2P] networks H04L67/104
• CPC Class Codes: H04N 21/6168 involving cable transmission, e.g. using a cable modem
• CPC Class Codes: H04N 7/17309 Transmission or handling of upstream communications

Abstract

A communications controller (132) transfers communication links from a first receiver (144) to a second receiver (146) when a system quality parameter exceeds a threshold. The first receiver (144) is used to perform idle carrier scanning by tuning to each idle carrier and executing a quality metric measuring procedure for the carrier or a channel on the carrier. The quality metrics are stored in memory (160) and the idle carriers are ranked according to their corresponding quality metrics. The communication controller (132) adds or replaces carriers based on their ranking. In this manner, communication channels may be more efficiently managed.

Claims

1. In a communication system having a remote unit, a public network and a plurality of receivers configured for communication between the remote unit and the public network, in which communications between the remote unit and the one or more of the plurality of receivers occur over a plurality of carrier frequencies, a method comprising the steps of:

receiving at least one communication link on a first receiver of the plurality of receivers;

transferring the at least one communication link from the first receiver to at least one secondary receiver of the plurality of receivers when a first quality parameter of the communication system exceeds a first threshold, the at least one secondary receiver being selectable from any of the plurality of receivers;

after the communication links have been transferred from the first receiver, using the first receiver to scan a set of the carrier frequencies that should be idle; and

executing a quality metric measuring procedure to produce a quality metric for each idle carrier frequency in the set through the first receiver.

2. A method according to claim 1 wherein the first quality parameter is derived from a duration of time since a quality metric measuring procedure was last executed.

3. A method according to claim 1, the step of transferring a communication link comprising the steps of:

transmitting a transfer message including a transfer carrier frequency to a remote unit coupled to the first receiver through the communication link; and

establishing the communication link between the second receiver and the remote unit on the transfer carrier frequency.

4. A method according to claim 1, the step of executing a quality metric measuring procedure including the steps of:

tuning the first receiver to a communication channel; and

measuring a quality metric for the communication channel.

5. A method according to claim 4, wherein the step of measuring a quality metric for the communication channel includes the step of measuring a level of noise in the communication channel.

6. A method according to claim 4 wherein the communication channel is a radio frequency carrier.

7. A method according to claim 4 further comprising the steps of:

tuning the first receiver to a plurality of communication channels; and

measuring a quality metric for each of the plurality of communication channels.

8. A method according to claim 9 further comprising the steps of:

assigning a plurality of communication links to the plurality of communication channels according to the quality metric for each of the plurality of communication channels.

9. A method according to claim 1 further comprising the step of blocking new calls only if sufficient bandwidth is not available in the communication system to transfer the at least one communication link and a second quality parameter exceeds a second threshold.

10. A method according to claim 9 wherein the second quality parameter is derived from a duration of time since a quality metric measuring procedure has been executed.

11. A method according to claim 10 wherein the first quality parameter is derived from at least one quality metric.

20. A method according to claim 1 wherein no apparatus in addition to the plurality of receivers is provided for scanning the carrier frequencies that should be idle.

12. In a communication system having a remote unit, a public network and a plurality of receivers configured for communication between the remote unit and the public network, in which communications between the remote unit and the plurality of receivers occur over a plurality of carrier frequencies, a method comprising the steps of:

receiving at least one communication link on a first receiver of the plurality of receivers;

transferring the at least one communication link from the first receiver to at least a second receiver selected from any of the plurality of receivers when a first quality parameter of the communication system exceeds a first threshold, the first quality parameter is derived from a duration of time since a quality metric measuring procedure has been executed;

blocking new calls only if sufficient bandwidth is not available in the communication system to transfer the at least one communication link and when a second quality paranmeter exceeds a second threshold, the second quality parameter is derived from a duration of time since a quality metric measuring procedure on the set of idle carrier frequencies that should be idle has been executed;

after the communication links have been transferred from the first receiver, using the first receiver to scan a set of carrier frequencies that should be idle; and

executing a quality metric measuring procedure to produce a quality metric for each idle carrier frequency in the set through the first receiver.

13. In a communication system having a remote unit, a public network and a plurality of receivers configured for communication between the remote unit and the public network, in which communications between the remote unit and the plurality of receivers occur over a plurality of carrier frequencies, an apparatus comprising:

a communication controller coupled to the plurality of receivers;

wherein a first receiver of the plurality of receivers establishes at least one communication link in the communication system and the communication controller transfers the at least one communication link from the first receiver to at least one secondary receiver of the plurality of receivers when a first quality parameter exceeds a first threshold in order for the communication controller to use the first receiver for scanning a set of carrier frequencies that should be idle and the communication controller executing a quality metric measuring procedure on the set of carrier frequencies that should be idle through the first receiver, the at least one secondary receiver being any available one or more receivers selected from the plurality of receivers.

14. An apparatus according to claim 13 wherein the first receiver is tuned to a first carrier frequency and the second receiver is tuned to a second carrier frequency.

15. An apparatus according to claim 13 further comprising a transmitter coupled to the communication controller, the transmitter responsive to the communication controller by transmitting a transfer message to the communication system when the communication controller transfers the communication link from the first receiver to the second receiver.

16. An apparatus according to claim 13 wherein the communication controller derives the first quality parameter from a duration of time since a quality metric measuring procedure has been executed.

17. An apparatus according to claim 13 wherein the communication controller blocks new calls when a second quality parameter exceeds a second threshold and an idle bandwidth required to transfer the at least one communication link from the first receiver to the at least one secondary receiver exceeds an available bandwidth in the communication system.

18. An apparatus according to claim 17 wherein the communication controller derives the second quality parameter from a duration of time since a quality metric measuring procedure has been executed.

21. An apparatus according to claim 13 wherein no apparatus in addition to the plurality of receivers is provided for scanning the carrier frequencies that should be idle.

19. In a communication system having a remote unit, a public network and a plurality of transceivers configured for communication between the remote unit and the public network, in which communications between the remote unit and the plurality of transceivers occur over a plurality of carrier frequencies, an apparatus comprising:

a communication controller coupled to the plurality of transceivers;

wherein a first transceiver of the plurality of transceivers establishes at least one communication link between the remote unit and the public network;

wherein the communication controller transfers the at least one communication link from the first transceiver to at least one secondary transceiver of the plurality of transceivers by transmitting a transfer message through the first transceiver to the remote unit when a first quality parameter exceeds a first threshold, the at least one secondary transceiver being selected from any of the plurality of transceivers;

the communication controller blocking new calls when a second quality metric exceeds a second threshold and an idle bandwidth required for transferring the at least one communication link from the first transceiver to the at least one secondary transceiver of the plurality of transceivers exceeds an available idle bandwidth; and

the communication controller executing a quality metric measuring procedure on a set of carrier frequencies that should be idle through the first transceiver.