CONCURRENT VOICE AND DATA SERVICE ON A SAME DIGITAL RADIO CHANNEL

摘要

A method, a subscriber unit, and a system provide concurrent voice and data systems and methods that “steal bits” from voice frames for low-speed concurrent data. In this manner, concurrent voice and data is supported over protocols that require voice-only in current operation such as Project 25 (P25). The stealing of bits from voice is done in a manner that is transparent and not noticeable to users. The systems and methods enable replication of signaling on the downlink and wireline segments that is replaced on the uplink, encoding of interleaving blocks that extend across multiple Layer 2 voice logical data units (LDUs), flexibility in replacing voice data in LDUs, indication of the availability of the service and an interleaving schedule, notification of upcoming stealing events via signaling, and the like.

主权项

1. A method comprising:
transmitting a voice transmission on a land-mobile radio channel; determining a need to transmit one or more data packet data units (PDUs) concurrently with the voice transmission; selecting one or more voice PDUs on the land-mobile radio channel to steal bits therein to transport the one or more data PDUs concurrently with the voice transmission; coordinating a schedule to steal the bits between a subscriber unit and a base radio; and transmitting the one or more data PDUs according to the schedule as the concurrent service with voice.