| R-UIM: Removable User Identity Module |
Removable User Identity Module (R-UIM), also known as UIM, is similar to a Subscriber Identity Module (SIM), but is designed for networks other than GSM such as CDMA. R-UIM cards support roaming between CDMA and GSM networks.
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| RAB: Reverse-Link Activity Bit |
Reverse-Link Activity Bit (RAB) is for determining the data rate of a reverse link communication of a mobile communication system. A processor in the access terminal may determine whether the access terminal is in an idle mode, and passing a non-busy state value of the RAB to the digital filter when the access terminal is in the idle mode. The RAB may be compared to a threshold to determine a mode of reverse link data rate determination. The mode defines a set of criteria for an aggressiveness level of increasing or decreasing the reverse link communication data rate. The processor, therefore, determines the data rate based on the filtered reverse activity bit in accordance with the determined mode.
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| RACE:Research in Advanced Communications |
Research in Advanced Communications Equipment (RACE) is an ETSI research project that has subsequently been replaced by ACTS.
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| RACH: Random Access Channel |
Random Access Channel (RACH) is the channel used by mobiles in GSM and W-CDMA systems to gain access to the system when first attaching to it.
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| Radio |
Radio is the electromagnetic waves whose frequencies are below 3,000 GHz as defined in Article 2 of the Radio Law in general. However, in practice, radio is generally refered to as electromagnetic waves whose frequencies are between 10 kHz and 300 GHz.
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| Radio link |
Radio link refers to the equipment and transmission path (propagation channel) used to carry on communications. It includes the transmitting system, the propagation channel and receiving system.
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| Radio port |
Radio port is a unit that supports transmission of signals over the air interface.
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| Radio propagation |
Radio propagation refers to the electromagnetic waves at radio frequencies as they radiate from a transmitting antenna.
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| Rake receiver |
Rake receiver is a radio receiver having multiple "fingers" and utilizing off-sets of a common spreading code to receive and combine several multipath (time delayed) signals, in effect using "time diversity" to overcome deep fades.
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| RAN: Radio Access Network |
Radio Access Network (RAN) is the ground-based infrastructure required for delivery of third-generation (3G) wireless communications services, including high-speed mobile access to the Internet. The RAN must be able to manage a wide range of tasks for each 3G user, including access, roaming, transparent connection to the public switched telephone network and the Internet, and Quality of Service (QoS) management for data and Web connections.
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| RANAP: Radio Access Network Application |
Radio Access Network Application Part (RANAP) is the Radio Network Layer signaling protocol used in a UMTS system on the Iu interface. It is responsible for functions including the setting up of a RAB (Radio Access Bearer) between the CN (Core Network) and the RNC (Radio Network Controller).
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| Random access |
Random access is a technique for radio access to a network where an access message is not coordinated or administered by the network and can collide with other attempts by others to access the network over the same channel.
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| Rayleigh channel |
Rayleigh channel is a communications channel having a fading envelope in the form of the Rayleigh Probability Density Function.
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| Rayleigh fading |
Rayleigh fading is a type of signal fading caused by independent multipath signals having a Rayleigh PDF.
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| RBDS: Radio Broadcast Data System |
Radio Broadcast Data System (RBDC), an replacement of Emergency Braodcast System, allows radio stations to send text messages, such as emergency warning and traffic alerts to radios installed with special display screens.
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| RC: Radio Configuration |
Radio Configuration (RC) defines the physical channel configuration of cdma2000 (IS-2000) signals. Each RC specifies a set of data rates based on either 9.6 or 14.4 kbps. RC1 is the backwards-compatible mode of cdmaOne for 9.6 kbps voice traffic. It includes 9.6, 4.8, 2.4, 1.2 kbps data rates and operates at Spread Rate 1 (SR1). RC3 is a cdma2000 specific configuration based on 9.6 kbps that also supports 4.8, 2.7, and 1.5 kbps for voice, while supporting data at 19.2, 38.4, 76.8, and 153.6 kbps. RC3 also operates at SR1.
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| RCC: Radio Common Carrier |
Radio Common Carrier (RCC) refers to a service provider for public mobile service.
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| RDCCH: Reverse Digital Control Channel |
Reverse Digital Control CHannel (RDCCH), defined in the IS-136, is for the upstream signaling and control information from user equipment to cell site in a TDMA-based system. RDCCH works together with FDCCH which provides the downstream signaling and control information in such a system,
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| REAG Region |
REAG Region is a geographic area over which a WCS operator is licensed to provide service. REAGs are a group of economic areas (EAs) and were first used to license WCS service in the late 1990s. REAGs are very large, with 6 REAGs covering the entire continental United States.
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| Receive diversity |
Receive diversity is the process of providing two independent receiving systems and spatially separated antennas to overcome fading effects on the radio signal.
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| Receiver |
Receiver is a device on a transmission path which converts the signals as received from the transmission system into the signals required by the destination equipment.
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| Reed Solomon code |
Reed-Solomon codes are block-based error correcting codes with a wide range of applications in digital communications and storage. Reed-Solomon codes are used to correct errors in many systems including: (1) Storage devices (including tape, Compact Disk, DVD, barcodes, etc) (2) Wireless or mobile communications (including cellular telephones, microwave links, etc) (3) Satellite communications. (4) Digital television / DVB. (5) High-speed modems such as ADSL, cDSL, etc.
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| Reflection |
Reflection is a process that occurs when a propagating electromagnetic wave impinges upon a obstruction whose dimensions are very large when compared to the wavelength. Reflections from the surface of the earth and from buildings or walls produce reflected waves which may interfere,constructively or destructively at the receiver.
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| Registration |
Registration, in mobile wireless, is the process by which a mobile station informs the immediate service provider of its presence in the network and its desire to receive service.
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| Remote Access Point |
Remote Access Point, also known as relay access points, is one of a number of secondary access points in a wireless network that uses Wireless Distribution System (WDS) to extend its range. Remote access points connect to a master access point.
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