Motorola Solutions, Inc.

Motorola Corporation

Ramandeep Ahuja

Surender Kumar

Donald G Newberg

Peter E Thomas

Vidya Narayanan

David P Gurney

Mario Frank DeRango

Gregory D Bishop

Trent J Miller

Anthony R Metke

Michael F Korus

Peter M Drozt

Narayanan Venkitaraman

Deborah Monks

James A Marocchi

Shanthi E Thomas

Michelle M Antonelli

A radio communication system () provides a radio air interface at a master node () for subscriber units associated with the master node. Among the subscriber units are several slave nodes (). The communication system has the ability to operate as a secondary user in unused spectrum portions of a frequency band otherwise reserved for primary operators. The master node accesses an authorization server () to obtain a list of unused channels in the region of the master node. Each slave node also contacts the authorization server to obtain a list of unused channels in the region where each respective slave node is located, via another network (). The unused channels common to the slave nodes and the master node are used to create a backup radio operating parameter list which is used by the master node if a fault occurs between the master node the authorization server.

System and method for maintaining a backup radio operating parameter list in a secondary use communication system

Methods for increasing encryption synchronization availability include collecting encryption synchronization data from a first superframe received at a gateway. The encryption synchronization data is for decrypting media in a second superframe also received at the gateway. The encryption synchronization data from the first superframe is used to form a composite encryption synchronization codeword for decrypting media in a third superframe formed by the gateway, wherein the third superframe includes the composite encryption synchronization codeword and at least a portion of the media from the second superframe. The third superframe is sent to a receiving device so that media in the third superframe can be decrypted by the receiving device using the composite encryption synchronization codeword that is included in the same superframe as the media that is being decrypted.

System and method of increasing encryption synchronization availability

A radio communication system () provides a radio air interface at a master node () for subscriber units associated with the master node. Among the subscriber units are several slave nodes (). The communication system has the ability to operate as a secondary user in unused spectrum portions of a frequency band otherwise reserved for primary operators, such as licensed broadcasters. The master node accesses an authorization server () to obtain a list of unused channels in the region of the master node. Each slave node also contacts the authorization server to obtain a list of unused channels in the region where each respective slave node is located, via another network (). The unused channels common to the slave nodes and the master node are used to create a backup radio operating parameter list which is used by the master node if a fault occurs between the master node the authorization server.

A method for enabling group communications includes: establishing a group identity for a communication group comprising a first set of communication devices, and storing an identity for each of the communication devices in the first set; establishing a session to associate a second set of communication devices with the group identity, wherein the communication devices in the second set are different from the communication devices in the first set, wherein the session with the second set of communication devices is set up irrespective of a call being initiated for the communication group; detecting a first event associated with the initiation of a call for the communication group; and in response to detecting the first event, using the stored identities to join at least one of the communication devices in the first set to the session.

Method and apparatus for enabling group communication

A method and apparatus for bandwidth brokering in a communication system () defines groups () and a bandwidth allocation for each group at a given base station (). Each group has a guaranteed bandwidth (). Each group may exceed its guaranteed bandwidth () by using additional bandwidth if there other groups are not using their full guaranteed bandwidth () or if there is community bandwidth available. A group's bandwidth usage may be pre-empted () when its bandwidth usage exceeds its guaranteed bandwidth and other groups require additional bandwidth within their guaranteed bandwidth.

Method and apparatus for ensuring access in a communication system for a plurality of groups

A method for transmitting a packet from a transmitting node to a destination node in a communication network can enable improved network efficiency. The method includes receiving and storing identification information concerning at least one foreign node that is directly reachable in the communication network (block). It is then determined, using the identification information, whether the destination node is directly reachable in the communication network (block). Based on whether the destination node is directly reachable in the communication network, it is then determined whether to transmit the packet to the destination node using a tunneling protocol or without using a tunneling protocol (block). The packet is then transmitted from the transmitting node to the destination node (block).

Method and device for transmitting data packets

A method for terminating a communication session is present. During a communication session in which communication devices are in communication through a server, one of the devices decides to terminate the session. This device generates a first message requesting permission to terminate participation in the session and sends it to the server. The server, receiving the first message, determines whether or not there is session media being communicated or pending communication to the device. If not, the server generates a second message authorizing the device to terminate its participation in the session and sends it to the device. The device continues to listen for session media until, upon receiving the second message, it terminates its participation in the session.

Method for requesting the termination of a communication session

In a wireless ad hoc network comprising a plurality of nodes (), when a method of the present invention determines that a source node and a destination node belong to a common virtual local area network (VLAN), information is routed to the destination node using only nodes that belong to the common VLAN. If a path is not available to route the information between the source node and the destination node using only nodes that belong to the common VLAN, a default VLAN is used to route the information at least partially through the ad hoc network. If, however, the method of the present invention determines that the source node belongs to a first VLAN and the destination node belongs to a second VLAN, the source node or an intermediate node registers with the second VLAN and continues routing the information using nodes that belong to the second VLAN.

Method of dynamic management of a virtual local area network (VLAN) in a wireless ad hoc network

In a wireless ad hoc network comprising a plurality of nodes, a primary node receives a domain name service (DNS) query from a node. The primary node determines whether the query can be resolved based on cached information. If the DNS query can be resolved based on cached information, the primary node sends a response to the node. If the DNS query cannot be resolved based on cached information, the primary node sends the DNS query outside the ad hoc network for resolution.

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Chicago, IL, United States of America

Ramandeep Ahuja