Abstract: The present disclosure provides a system and a method for providing mobility management and out-of-coverage indication in a conventional Land Mobile Radio (LMR) system. A radio provides its location and user group data to the disclosed system through its traffic channel when the channel is idle. Knowledge of the radio's current location and user group data is used to provide dynamic call routing and data management within the disclosed system. The disclosed system and method may provide operability similar to that of a trunking system by providing mobility management and out-of-coverage indication while providing low-cost benefits through operation of a conventional system.

Abstract: A method and system for peer-to-peer communication among a plurality of sites in a land mobile radio (LMR) system. The sites are interconnected by a data network, such as an IP network. Each site transmits a periodic broadcast message, which includes the identity of the transmitting site and a list of target groups that the transmitting site is interested in participating. The message is received by the other sites, thus each site becoming aware of the presence of all other sites in the system and Talk Groups they are interested in. When a site, referred to as the initiating site, intends to communicate with other sites, the initiating site transmits a call request message. The call request message is multicast over the data network to the intended recipients. The initiating site receives an acknowledgement message from the other sites confirming their willingness to communicate with the initiating site.

Abstract: An exemplary land mobile radio dispatch console and method are provided. In one embodiment, the console has the capability to process and handle Requests To Talk (RTT) and emergencies. In another embodiment, the console has the capability to provide a history. In another embodiment, the console provides the capability for operators to configure and save patches of predefined groups for later use. In another embodiment, the console includes a telephone interconnect interface component, and combinations of features mentioned above.

Abstract: A method and system for peer-to-peer communication among a plurality of sites in a land mobile radio (LMR) system. The sites are interconnected by a data network, such as an IP network. Each site transmits a periodic broadcast message, which includes the identity of the transmitting site and a list of target groups that the transmitting site is interested in participating. The message is received by the other sites, thus each site becoming aware of the presence of all other sites in the system and Talk Groups they are interested in. When a site, referred to as the initiating site, intends to communicate with other sites, the initiating site transmits a call request message. The call request message is multicast over the data network to the intended recipients. The initiating site receives an acknowledgement message from the other sites confirming their willingness to communicate with the initiating site.

Abstract: An integrated Land Mobile Radio (LMR) system enables communication between a trunking land mobile radio (trunking LMR) system and a conventional land mobile radio (conventional LMR) system. The trunking LMR system includes a trunking site controller including a first network gateway router. The trunking LMR system includes at least one trunking control channel and a plurality of trunking traffic channel. The trunking traffic channels each are assigned to a specific trunking LMR subscriber by the trunking site controller to enable the trunking LMR subscribers to communicate with one another. The conventional LMR system includes a conventional site controller including a second network gateway router connected to the first network gateway router by a data network. The conventional LMR system includes a plurality of conventional traffic channels.

Abstract: A method and system for authentication of a plurality of sites in a land mobile radio (LMR) system and for encryption of messages exchanged by the sites. The plurality of sites are connected by a data network (e.g., IP network). The method includes transmitting by a first site its certificate. The certificate is created by a trusted authority by applying a selected function to the public key, the ID and other relevant information of the first site with the trusted authority's private key to generate a reduced representation and then encrypting the reduced representation with the trusted authority's private key. The method further includes receiving, by the other sites in the LMR system, the certificate transmitted by the first site. The method further includes decrypting, by the other sites, the certificate transmitted by the first site and authenticating the first site, wherein the certificate is decrypted using the trusted authority's public key.

Abstract: The present invention relates to a process for resolving an enantiomeric mixture of a-hydroxy acids or derivatives thereof through esterification and subsequent enzymatic hydrolysis of the ?-hydroxy acids or derivatives. The present invention also relates to purified ?-hydroxy acids or derivatives and methods of use thereof.