MCPTT Service provides the User ID of the current speaker(s) and their location determination features.An MCPTT Service user may join an already established MCPTT Group call (Late call entry).The MCPTT Service provides the means for a user to monitor activity on any number of separate calls (groups) and enables the user to switch focus to a specific call.MCPTT Service supports a mechanism to limit the time a user talks (holds the floor) thus permitting users of the same or lower priority a chance to gain the floor.MCPTT Service provides a means for a user with higher priority to override based on their priority (e.g., the head of an operation can obtain the floor at any time, Emergency requests are granted immediate floor access) to override (interrupt) the current talker.MCPTT supports Private Calls between pairs of users as well as broadcast calls (one to many).MCPTT supports several different types of group calls, users in groups are granted the ability to talk in an arbitrated manner based on Floor control (e.g., queue in priority order requests to speak, limit the time a user talks, etc.).Traditionally, LTE has been one-to-one communication, GCSE enables the fundamental requirement for efficient and dynamic group communications such as one-to-many calling and broadcast capabilities over LTE. MC Services are built on service enablers: Group Call System Enablers (GCSE).MC Services are based on 3GPP Evolved Packet System (EPS) services to support enhanced PTT services suitable for mission critical scenarios as well as consumer use cases.MCPTT enabled devices are expected to operate equally for normal telephony services. MCPTT Users expect to communicate with other MCPTT users as well as non-MCPTT users.Mission Critical functions such as Priority Access, Preemption, Ambient Listening and Imminent Peril Calls are not typically available to commercial users. Performance and MCPTT features in use vary per user organization.Commercial users of PTT service for non-critical use (e.g., private parties, small business, etc.) may also be delivered through an MCPTT system.MCPTT is primarily targeting to provide professional Push-to-Talk (PTT) services to Mission Critical users (e.g., public safety, transportation, health care, utilities, industrial services and energy).MCPTT TARGET USERS, CAPABILITIES & PERFORMANCE INDICATORS
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