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There are 52 names in this directory beginning with the letter R.
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.

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.

RACE:Research in Advanced Communications

Research in Advanced Communications Equipment (RACE) is an ETSI research project that has subsequently been replaced by ACTS.

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.


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.

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.

Radio port

Radio port is a unit that supports transmission of signals over the air interface.

Radio propagation

Radio propagation refers to the electromagnetic waves at radio frequencies as they radiate from a transmitting antenna.

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.

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.

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).

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.

Rayleigh channel

Rayleigh channel is a communications channel having a fading envelope in the form of the Rayleigh Probability Density Function.

Rayleigh fading

Rayleigh fading is a type of signal fading caused by independent multipath signals having a Rayleigh PDF.

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.

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.

RCC: Radio Common Carrier

Radio Common Carrier (RCC) refers to a service provider for public mobile service.

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,

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.

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.


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.

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.


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.


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.

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.


Repeater, also known as network repeater, is a type of network device that regenerates incoming electrical, wireless or optical signals. With physical media like Ethernet or Wi-Fi, data transmissions can only span a limited distance before the quality of the signal degrades. Repeaters attempt to preserve signal integrity and extend the distance over which data can safely travel. Active hubs are repeaters. In Wi-Fi, access points function as repeaters when operating in so-called “repeater mode.” In moble wireless, repeater receives radio signals from the base station and then amplified and retransmitted to areas where radio shadow occurs, and vice versa.

Reuse factor

Reuse factor, also known as frequency reuse factor, is the number of distinct frequency sets used per cluster of cells.

Reverse link

In radio communications, the reverse link, also known as return link, is the link from a mobile user to a fixed base station. If the link includes a communications relay satellite, the reverse link will consist of both an uplink (mobile station to satellite) and a downlink (satellite to base station).

RF License: Radio Frequency License

Radio Frequency (RF) License is the purchased right to transmit RF waves over a given BTA for typically periods of 10 years. The license tightly governs the design parameters of an RF system and its use. RF licenses typically are purchased from the government (FCC in the US) on an auction basis. The government (FCC) provides licenses to ensure maximum competition in a free market and spectral efficiency, which is another way of stating efficient use of the RF spectrum.

RF: Radio Frequency

Radio Frequency generally refers to wireless communications with frequencies below 300 GHz. Formally, according to the Article 2 of th Radio Law, radio frequency is below 3,000 GHz. Radio frequencies can be used for communications between a mobile telephone and an antenna mast.

RFCOMM: Radio Frequency Communication

Radio Frequency Communication (RFCOMM) is a Bluetooth protocol which is a simple set of transport protocols, providing emulated RS232 serial ports (up to sixty simultaneous connections of a bluetooth device at a time). RFCOMM is sometimes called Serial Port Emulation. The Bluetooth Serial Port Profile is based on this protocol.

RFI: Radio Frequency Interference

Radio Frequency Interference (RFI) refers to the noise caused by other Radio Frequency that interferes with information being transmitted across unshielded copper cable.

RFID: Radio frequency identification

Radio frequency identification (RFID) is a system for tagging and identifying mobile objects such as store merchandise, postal packages and sometimes living organisms (like pets). RFID uses low-powered radio transmitters to read data stored in a transponder (tag) at distances ranging from one inch to 100 feet. RFID tags are used to track assets, manage inventory and authorize payments, and they increasingly serve as electronic keys for everything from autos to secure facilities. RFID works using small (sometimes smaller than a fingernail) pieces of hardware called RFID chips. These chips feature an antenna to transmit and receive radio signals. So-called passive RFID chips do not have a power source, but active RFID chips do. RFID chips may be attached to objects, or in the case of some passive RFID systems, injected into objects.

Rician channel

Rician channel is a transmission channel that may have a line-of-sight component and several scattered of multipath components. This fading characteristic exhibits a Rician PDF (Probability Density Function).

Rician fading

Rician fading is a type of signal fading having a characteristic similar to the Rician PDF (Probability Density Function). It is used to model the mobile radio propagation.

Rician PDF

Rician PDF is a type of signal fading caused by independent multipath signals. The Rician PDF reduces to the Rayleigh PDF for the special case when s = 0.

RLC: Radio Link Control

Radio Link Control (RLC) is a link-layer protocol that is responsible for error recovery and flow control in 3G (UMTS) cellular systems. Compared with its counterpart developed for CDMA-2000 systems, i.e., Radio Link Protocol (RLP), RLC is a more advanced protocol and can support different QoS requirements desired by the users.

RLP: Radio Link Protocol

Radio Link Protocol (RLP) is a link layer protocol used for 2G (GSM and cdmaOne) and CDMA-2000 (3G) network-based error corrections to ensure robust data transmission. RLP terminates at the Mobile Station (MS) and the Interworking Function (IMF) generally located at the Mobile Switching Centre (MSC). Cellular networks such as GSM and CDMA use different variations of RLP.

RNC: Radio Network Controller

The Radio Network Controller (RNC) is the governing element in the UMTS radio access network (UTRAN) responsible for control of the Node Base Stations (BS), that is to say, the base stations which are connected to the controller. The RNC carries out radio resource management, some of the mobility management functions and is the point where encryption is done before user data is sent to and from the mobile. The RNC connects to the Circuit Switched Core Network through Media Gateway (MGW) and to the SGSN (Serving GPRS Support Node) in the Packet Switched Core Network. There are three types of RNCs: C-RNC (Controlling RNC), D-RNC (Drift RNC) and S-RNC (Serving RNC).


Roaming refers to the movement of a mobile device from one wireless network location to another without interruption in service or loss in connectivity. When a call is made to a roaming mobile, the public telephone network will route the call to your service provider's network since that is where your phone number terminates. Your home network is then responsible for re-routing the call to the host network.

Rogue Access Point

Rogue Access Point is an unauthorized access point installed on a network that may provide an entry point for unauthorized network access.

RPC: Reverse Power Control

Reverse Power Control (RPC) is a method for a Wireless Local Loop (WLL), in which the number of times of power control value transmission is reduced to 1. RPC reduces unnecessary power consumption in the WLL system and improves the reliability of the communication system.

RPE-LTP: Regular Pulse Excited-Long Term

Regular Pulse Excited Long Term Prediction (RPELTP) is a type of speech coding using regularly spaced pulses in an excitation frame and a long-term predictor to model the fine structure (pitch).

RRC: Radio Resource Control

Radio Resource Control (RRC) is a sublayer of Layer 3 on the UMTS 3G radio interface. RRC exists in the control plane only and provides information transfer service to the NAS (Non Access Stratum). RRC is responsible for controlling the configuration of UMTS radio interface Layers 1 and 2.

RRD: RF Receiving Device

RF Receiving Device (RRD) receives over the air data and forwards it to the mobile computer.

RRI: Reverse Rate Indicator

Reverse Rate Indicator (RRI) is a parameter in a 3G wireless network provided by the reverse link, which aids the Access Point in determining the rate at which the reverse link is sending data. The RRI is included as the preamble for reverse link frames, indicating the rate at which the data was sent.

RRS: Round Robin Scheduling

Round Robin Scheduling (RRS) is a scheduling scheme used in wireless network. Since many stations share one channel in a wireless network, this algorithm provides every station to transmit or receive on the shared channel at a regular interval. Round-robin is one of the simplest scheduling algorithms for processes in an operating system, which assigns time slices to each process in equal portions and in order, handling all processes without priority. Round-robin scheduling is both simple and easy to implement, and starvation-free. Round-robin scheduling can also be applied to other scheduling problems, such as network scheduling.

RS: Relay Station

Relay Station (RS), a concept defined in the IEEE 802.16j for the WiMAX network, is a station with the following functions: (1) to relay user data and possibly control information between other stations, and (2) to execute processes that indirectly support mobile multihop relay. All RSs are managed by an MMR-BS, but they may have some control of relay functions within their neighborhood.

RSA: Rural Service Area

Rural Service Area (RSA) is a geographic area in the US over which a cellular operator is licensed to provide service. RSAs are a group of rural counties having common financial, commercial and economic ties and were used to license cellular services together in the latter 1980s. RSAs cross state lines in some instances and were developed during a public rule making process at the FCC in 1987 and 1988..

RSSI: Relative Signal Strength Indicator

Relative Signal Strength Indicator (RSSI) is a measurement of radia signals at the point in which they are received and measured.

RTG: Receive/transmit Transition Gap

Receive/transmit Transition Gap (RTG), a concept in the mobile wireless network, is a gap between the last sample of the uplink burst and the first sample of the subsequent downlink burst at the antenna port of the BS in a time division duplex (TDD) transceiver. This gap allows time for the base station (BS) to switch from receive to transmit mode. During this gap, the BS is not transmitting modulated data but simply allowing the BS transmitter carrier to ramp up, and the transmit/receive (Tx/Rx) antenna switch to actuate.

rtPS: Real-Time Polling Service

Real-Time Polling Service (rtPS) is one of the five QOS service types defined in the IEEE 802.16 WiMAX. The 802.16 protocol supports five types of QoS: UGS (Unsolicited grant service), rtPS (Real time polling Service), ertPS (Extended Real-time POLLING SERVICE), nrtPS (Non-real-time polling service and BE (Best effort service). The Real-Time Polling Service (rtPS) is designed to support real-time service flows that generate variable size data packets on a periodic basis, such as MPEG video. The service offers real-time, periodic, unicast request opportunities, which meet the flow’s real-time needs and allow the SS to specify the size of the desired grant. This service requires more request overhead than UGS, but supports variable grant sizes for optimum data transport efficiency.

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