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04/30/09 - USPTO Class 709 |  17 views | #20090112983 | Prev - Next | About this Page  709 rss/xml feed  monitor keywords

Floor control in a communications system

USPTO Application #: 20090112983
Title: Floor control in a communications system
Abstract: A method (400) of implementing floor control in a communications system (100). The method can include receiving a random symbol from each of a plurality of communication devices (104, 106, 108, 110, 112) or network nodes (204, 206, 208, 210, 212). From the plurality of random symbols, a random symbol that satisfies a criteria can be identified. Floor ownership can be granted to a selected one of the communication devices associated with the identified random symbol or from which the identified random symbol was received. (end of abstract)



Agent: Motorola, Inc. - Schaumburg, IL, US
Inventors: Tyrone D. Bekiares, Bradley M. Hiben, Bob LoGalbo
USPTO Applicaton #: 20090112983 - Class: 709204 (USPTO)

Floor control in a communications system description/claims


The Patent Description & Claims data below is from USPTO Patent Application 20090112983, Floor control in a communications system.

Brief Patent Description - Full Patent Description - Patent Application Claims
  monitor keywords BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to communications systems and, more particularly, to those which support half duplex communications.

2. Background of the Invention

At a given time, a half duplex logical channel in a wide area communications system typically will allow only a single subscriber station to communicate media to other subscriber stations associated with the same half duplex logical channel. The subscriber station that is allowed to communicate is generally referred to as a “floor owner.” The process of selecting a floor owner from a plurality of subscriber stations seeking to communicate is generally referred to as “floor control.”

Certain wide area communications systems do not provide a centralized floor control mechanism to assign floor ownership for a given half duplex logical channel. In such systems, the subscriber stations signal their requests for floor ownership by transmitting floor requests directly to other subscriber stations associated with the same half duplex logical channel. Such floor requests can be explicit or implicit. An explicit floor request is a floor request that is distinct from media being communicated, whereas an implicit floor request is coupled to the media.

Each of the subscriber stations that receives such a request typically selects a floor owner by selecting the remote subscriber station that transmitted the floor request which it first receives, assuming floor ownership is not currently assigned, of course. In such an arrangement, it is possible for receiving subscriber stations to receive floor requests from multiple subscriber stations attempting to acquire floor ownership at roughly the same time. Moreover, differing signal propagation delays may exist between the plurality of subscriber stations associated with the same half duplex logical channel. As a result, different subscriber stations may grant floor ownership to different transmitting subscriber stations. Such unsynchronized behavior can disrupt communications amongst a group of subscriber stations associated with the same half duplex logical channel, as individual subscriber stations belonging to the group may be reproducing different data streams concurrently.

In communications systems that do provide a centralized request and grant mechanism, a subscriber station typically requests floor ownership by communicating a request for floor control to a centralized controller. Assuming floor ownership is currently available, the first request for floor control received by the controller for a given half duplex logical channel is typically granted. Later requests from other subscriber stations trying to access that same half duplex logical channel will typically be denied until the selected floor owner gives up floor ownership. Use of a centralized controller adds costs to a communications system, however.

SUMMARY OF THE INVENTION

The present invention relates to a method of implementing floor control in a communications system. The method can include receiving a random symbol from each of a plurality of communication devices. From the plurality of random symbols, a random symbol that satisfies a criteria can be identified. Floor ownership can be granted to a selected one of the communication devices from which the identified random symbol was received.

The present invention also relates to a method of implementing floor control in a communications system, which includes receiving a random symbol from each of a plurality of network nodes and, from the plurality of random symbols, identifying a random symbol that satisfies a criteria. The method further can include granting floor ownership to a communication device associated with the identified random symbol.

Another arrangement of the present invention relates to a communication device. The communication device can include a transceiver that receives a random symbol from each of a plurality of other communication devices. The communication device can also include a floor control application that, from the plurality of random symbols, identifies a random symbol that satisfies a criteria. The floor control application can grant floor ownership to a selected one of the other communication devices from which the identified random symbol was received.

The present invention also relates to a network node. The network node can include a network adapter that receives a random symbol from each of a plurality of other network nodes. The network node further can include a floor control application that, from the plurality of random symbols, identifies a random symbol that satisfies a criteria, and grants floor ownership to a communication device associated with the identified random symbol.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the present invention will be described below in more detail, with reference to the accompanying drawings, in which:

FIG. 1 depicts a communications system that is useful for understanding the present invention;

FIG. 2 depicts another communications system that is useful for understanding the present invention;

FIG. 3 depicts a buffer timing diagram that is useful for understanding the present invention;

FIG. 4 depicts a block diagram of a communication device that is useful for understanding the present invention;

FIG. 5 depicts a block diagram of a network node that is useful for understanding the present invention;



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