IPR LICENSING, INC. Patent applications |
Patent application number | Title | Published |
20160066323 | QUALIFYING AVAILABLE REVERSE LINK CODING RATES FROM ACCESS CHANNEL POWER SETTING - Methods and apparatuses are disclosed regarding a field unit, which may receive a plurality of forward link assignment messages for a plurality of time slots for a plurality of forward link transmissions, each message including an indication of a modulation and a code rate associated with a respective forward link transmission. The unit may receive at least one of the forward link transmissions in at least two of the time slots at the respective indicated modulation and code rate. The unit may receive a plurality of reverse link assignment messages for a plurality of time slots for a plurality of reverse link transmissions, each message including an indication of a modulation and a code rate associated with a respective reverse link transmission. The unit may transmit at least one of the reverse link transmissions in at least two of the time slots at the respective indicated modulation and code rate. | 03-03-2016 |
20160050638 | PROXY MOBILE NODE CAPABILITY FOR MOBILE IP - A method and system are provided for transmitting information in a Mobile Internet Protocol (IP) environment, which includes a home agent (HA) provided at a home network, a base station (BS) broadcasting a pilot signal, a foreign agent (FA) provided at or associated with the BS, a mobile node (MN) providing the ability to detect and identify itself to a BS, a proxy mobile node (PMN) Identifying the MN wherein the PMN is provided at the BS. If the PMN identifies the MN, the PMN retrieves an IP address for each of the MN, FA and HA and sends a registration request to the FA. The FA relays the registration request to the HA, and the proxy MN is registered with the HA. Thus, the MN functionality is provided transparently to the MN by the PMN. This significantly simplifies the configuration of the MN and the Mobile IP network. | 02-18-2016 |
20160050584 | APPLICATION SPECIFIC TRAFFIC OPTIMIZATION IN A WIRELESS LINK - A packet data system such as a TCP/IP network transmits packets containing a variety of data types along links in the network. Packets are transmitted in a stream between nodes interconnected by the links connections, which conform to a transport layer protocol such as TCP, UDP, and RSTP, and include wireless links, which transmit packets using a radio frequency (RF) medium. By examining the data in a packet, performance characteristics such as a port number are determined. The performance characteristics indicate the application type, and therefore, the data type, of the packets carried on the connection. Since certain data types, such as streaming audio and video, are more loss tolerant, determination of the data type is used to compute link control parameters for the wireless link which that are optimal to the type of data being transmitted over the link. | 02-18-2016 |
20160050546 | METHOD AND APPARATUS FOR WIRELESS ROUTER MULTICAST - A subscriber unit includes a receiver configured to monitor at least one channel for a first identifier and a second identifier. The first identifier is associated with a unicast transmission and the second identifier is associated with a multicast transmission. The subscriber unit includes a transmitter configured, in response to receiving a first message including the first identifier over the monitored at least one channel, to utilize an assignment of resources within the first message for the unicast transmission. The subscriber unit further includes a processor configured, in response to receiving a second message including the second identifier over the monitored at least one channel, to process information within the second message associated with the multicast transmission. | 02-18-2016 |
20150257097 | CODED REVERSE LINK MESSAGES FOR CLOSED-LOOP POWER CONTROL OF FORWARD LINK CONTROL MESSAGES - A field unit includes circuitry configured to receive a signal and determine whether the received signal has a predetermined quality; circuitry configured to select a signal from a plurality of signals including a first signal indicating that the field unit is requesting an assignment of resources and the received signal was received with the predetermined quality, a second signal indicating that the field unit is requesting an assignment of resources and the received signal was not received with the predetermined quality, a third signal indicating that the field unit is not requesting an assignment of resources and the received signal was received with the predetermined quality, and a fourth signal indicating that the field unit is not requesting an assignment of resources and the received signal was not received with the predetermined quality; and circuitry configured to transmit the selected signal over a control channel. | 09-10-2015 |
20150189650 | AUTOMATIC UPLINK CHANNEL ASSIGNMENT - A method and apparatus for communication is disclosed. Information is received on a downlink channel in a first time interval. Feedback information regarding the received information is transmitted in a second time interval on an uplink channel. For the second time interval, an explicit allocation of the uplink channel is not received. The second time interval on the uplink channel is a pre-determined time period away from the first time interval on the downlink channel. | 07-02-2015 |
20150133187 | SUBSCRIBER UNIT FOR MANAGING DUAL WIRELESS COMMUNICATION LINKS - A technique for communication with a local area network (LAN) via a wireless connection determines whether a first short-range, high-speed, wireless communication path is available and connects to the LAN using a longer range, lower speed wireless communication path if the short-range, high-speed wireless communication path is not available. The low-range, high-speed wireless communication path is a wireless communication path is a wireless LAN connection such as an IEE 802.11-compliant wireless LAN and the long-range, low-sped wireless communication mode is a cellular CDMA-type connection. Determining whether the first IEEE 802.11 mode is available can be done by detecting a beacon signal, or transmitting a probe request message and detecting a probe response message in response to the probe request, indicating the presence or availability of the short-range, high-speed wireless communication path. Alternatively, the availability of short-range, high-speed wireless communication path can be detected by simply detecting activity on it. | 05-14-2015 |
20150131620 | COMMUNICATING REFERENCE AND DATA INFORMATION IN A WIRELESS NETWORK - A mobile device may generate reference bits. The mobile device may also produce a frame to send in an uplink transmission having two portions selectively with the reference bits or data bits. | 05-14-2015 |
20150043567 | QUALIFYING AVAILABLE REVERSE LINK CODING RATES FROM ACCESS CHANNEL POWER SETTING - Methods and apparatuses are disclosed regarding data rate and resource allocation decisions which are made for a communications channel, such as a wireless reverse connection. The wireless reverse connection may be between stations. One of the stations may be a base station and another station may be a field unit. The field unit may transmit data to a base station at a first data rate, based on a first resource allocation. Also, the field unit may transmit, to the base station, an indication, such as a digital data word, that the field unit has the capability to support the transmission of uplink data at a second data rate. The base station may transmit a second resource allocation to the field unit. After receiving the second resource allocation, the field unit may transmit additional uplink data to the base station at the second data rate based on the second resource allocation. | 02-12-2015 |
20150009974 | TRANSMITTING ACKNOWLEDGEMENT MESSAGES USING A STAGGERED UPLINK TIME SLOT - A downlink communication is transmitted/received in at least one downlink time slot. In response to the received downlink communication, an acknowledgement message is received/transmitted in an uplink time slot a fixed integer number of uplink time slots after transmission/reception of the received downlink communication. The uplink and downlink time slots are staggered by substantially a half of a time slot. | 01-08-2015 |
20140376539 | REVERSE LINK PILOT INTEGRATED WITH BLOCK CODES - A technique for encoding digital communication signals. Data symbols are augmented in pilot symbols inserted at predetermined positions. The pilot augmented sequence is then fed to a deterministic error correction block encoder, such as a turbo product coder, to output a coded sequence. The symbols in the error correction encoded sequence are then rearranged to ensure that the output symbols derived from input pilot symbols are located at regular, predetermined positions. As a result, channel encoding schemes can more easily be used which benefits from power of two length block sizes. | 12-25-2014 |
20140314052 | TECHNIQUES FOR SETTING UP TRAFFIC CHANNELS IN A COMMUNICATIONS SYSTEM - A control channel supporting traffic control in epochs is divided into two control subchannels each being less than or equal to about a half epoch in duration and occurring serially in time. Slot allocation data may be transmitted and received independently over the subchannels. One subchannel may be used for transmitting forward slot allocation data and the other subchannel may be used for transmitting reverse slot allocation data. The channel split into two subchannels may be a paging channel. The forward and reverse slot allocation data may be transmitted between a base station processor and field unit. Forward and reverse traffic data may be staggered by at least about half an epoch. Transmission of traffic data happens within about two epochs after the assignments. | 10-23-2014 |
20140269571 | CODED REVERSE LINK MESSAGES FOR CLOSED-LOOP POWER CONTROL OF FORWARD LINK CONTROL MESSAGES - A field unit includes circuitry configured to receive a signal and determine whether the received signal has a predetermined quality; circuitry configured to select a signal from a plurality of signals including a first signal indicating that the field unit is requesting an assignment of resources and the received signal was received with the predetermined quality, a second signal indicating that the field unit is requesting an assignment of resources and the received signal was not received with the predetermined quality, a third signal indicating that the field unit is not requesting an assignment of resources and the received signal was received with the predetermined quality, and a fourth signal indicating that the field unit is not requesting an assignment of resources and the received signal was not received with the predetermined quality; and circuitry configured to transmit the selected signal over a control channel. | 09-18-2014 |
20140254563 | METHOD AND APPARATUS FOR A SPECTRALLY COMPLIANT CELLULAR COMMUNICATION SYSTEM - A system for wireless data transmission that uses a channel bandwidth, channel separation, and radio frequency power spectrum which is compatible with existing deployments of wireless voice services. The transmitted waveforms are thus compatible with existing cellular networks. However, the time domain digital coding, modulation, and power control schemes are optimized for data transmission. Existing cellular network sites can thus be used to provide a high speed service optimized for wireless data traffic without the need for new radio frequency planning, and without interfering with existing voice service deployments. | 09-11-2014 |
20140177617 | TWO TIER HI-SPEED WIRELESS COMMUNICATION LINK - A method and apparatus for mobile two-tier wireless communication are provided. A wireless communication signal may be received at a mobile communication device from a cellular base station. Data may be recovered from the received wireless communication signal. The data may be transmitted to an IEEE 802.11 user device. A second wireless communication signal may be received from the IEEE 802.11 user device. Data may be recovered from the second wireless communication signal. The data may be transmitted to the cellular base station. | 06-26-2014 |
20140177594 | METHOD AND APPARATUS FOR ALLOWING SOFT HANDOFF OF A CDMA REVERSE LINK UTILIZING AN ORTHOGONAL CHANNEL STRUCTURE - Method and apparatus for base stations and subscriber units allows soft handoff of a CDMA reverse link utilizing an orthogonal channel structure. Subscriber units transmit an orthogonally coded signal over a reverse link to the base stations. A given base station provides timing control of the timing offset of the reverse link signal. Based on at least one criterion, an alignment controller determines that the given base station should hand off timing control to another base station, and a soft handoff process ensues. In response to a command or message for soft handoff of the subscriber unit from the given base station to another base station, the subscriber unit makes a coarse timing adjustment to the timing of the coded signal. The subscriber unit may make fine timing adjustments based on feedback from the base station controlling timing. Multiple base stations may provide power control feedback to the subscriber unit. | 06-26-2014 |
20140086231 | MAINTAINING A MAINTENANCE CHANNEL IN A REVERSE LINK OF A WIRELESS COMMUNICATIONS SYSTEM - In a reverse link of a wireless CDMA communication system, a method of maintaining an idling mode connection between a field unit and a base transceiver station is provided using various techniques to maintain the idle mode connection at a reduced power level. A preferred embodiment computes a time slot or frame offset based on modulo function using a field unit identifier in order to distribute field unit maintenance transmissions among available slots or offsets. An alternate embodiment detects explicit signaling states changes at the physical layer and causes power target changes. A further embodiment transmits maintenance data during predetermined time intervals, coordinated between the field units and BTS, allowing power levels to be adjusted accordingly. | 03-27-2014 |
20140016561 | METHOD FOR COMPENSATING FOR MULTI-PATH OF A CDMA REVERSE LINK UTILIZING AN ORTHOGONAL CHANNEL STRUCTURE - An apparatus for receiving reverse link signals from a plurality of subscriber units in a multi-path environment is described. The apparatus includes a receiver in a base station that receives a first plurality of reverse link signals and a second plurality of reverse link signals in a time interval. Each reverse link signal of the first plurality of reverse link signals is derived from at least a common pseudo noise (PN) sequence and unique orthogonal sequence and each reverse link signal of the second plurality of reverse link signals is derived from a unique pseudo noise (PN) sequence. The apparatus also includes a a processor that determines a timing offset associated with at least one reverse link signal to align a timing of the at least one reverse link signal with reverse link signals from other subscriber units. | 01-16-2014 |
20130343354 | POWER CONTROL PROTOCOL FOR HIGHLY VARIABLE DATA RATE REVERSE LINK OF A WIRELESS COMMUNICATION SYSTEM - A subscriber unit performs power control of a reverse link by sending heartbeat messages to a base station, permitting the base station to determine a reverse link quality report. Using a reverse link quality report message received from the base station, the subscriber unit calculates its reverse power level and maintains the reverse power level during the standby state. | 12-26-2013 |
20130343183 | WIRELESS CHANNEL ALLOCATION IN A BASE STATION PROCESSOR - A system and method are provided for allocating wireless channels in a base station processor to messages sent between a subscriber and the base station processor in a wireless network. A latency period is determined corresponding to a return message to be received from a responsive node in response to an outgoing message sent from a sender via the base station processor. A latency manager in the base station processor computes the latency period and stores the latency period in an allocation table. A scheduler schedules a channel to be available at the end of the latency period indicated in the allocation table. At the end of the latency period, the return message is received and the scheduler allocates a channel as defined in the allocation table. The scheduled channel is used to transmit the message to or from the corresponding subscriber. | 12-26-2013 |
20130322341 | REVERSE LINK INITIAL POWER SETTING USING EFFECTIVE RADIATED POWER MESSAGE TO COMPUTE PATH LOSS - In an illustrative embodiment of the present invention, a reference signal including pilot information is transmitted from a base station to one or multiple field units over a pilot channel. A message is also sent to the field units over a paging channel to indicate an effective radiated power level at which the reference signal is transmitted on the pilot channel. Based on a received power level of the reference signal at a field unit and the effective radiated power level of the reference signal, a forward path loss is estimated at the field unit for the forward link between the base station and field unit. Assuming the path loss in the reverse link is approximately the same as the estimated forward link path loss, the field unit can transmit, a reply message in the reverse link so that the base station generally receives a message at-a desired power level. | 12-05-2013 |
20130230031 | AUTOMATIC REVERSE CHANNEL ASSIGNMENT IN A TWO-WAY TDM COMMUNICATION SYSTEM - A method and apparatus for communication is disclosed. Information is transmitted on a downlink channel in a time interval. On a condition that an explicit allocation of a first uplink channel is transmitted, feedback information regarding the transmitted information is received on the first uplink channel, wherein the feedback information is received with user data on the first uplink channel. On a condition that an explicit allocation of the first uplink channel is not transmitted, feedback information regarding the transmitted information is received in a time interval on a second uplink channel, wherein an explicit allocation of the second uplink channel is not transmitted, wherein the time interval on the second uplink channel is a pre-determined time period away from the time interval on the downlink channel. | 09-05-2013 |
20130201962 | SYSTEM AND METHOD FOR MAINTAINING WIRELESS CHANNELS OVER A REVERSE LINK OF A CDMA WIRELESS COMMUNICATION SYSTEM - A subscriber access unit includes a transceiver for providing wireless communication of digital signals. The digital signals are communicated to a base station using at least one radio frequency (RF) channel via Code Division Multiple Access (CDMA) modulated radio signals defined by orthogonal codes. Orthogonal subchannels are made available by the base station within each CDMA RF channel. A bandwidth manager is connected to the transceiver, and when the transceiver is actively sending data, at least one orthogonal subchannel is allocated by the base station on an as-needed basis. The number of orthogonal subchannels being allocated changes during a given session. The transceiver, when powered on but not actively sending data, provides an idling mode connection on a reverse link. The idling mode connection is based on an orthogonal subchannel shared with at least one other subscriber access unit, but utilizes different time slots of the shared orthogonal subchannel. | 08-08-2013 |
20130182682 | DYNAMIC BANDWIDTH ALLOCATION FOR MULTIPLE ACCESS COMMUNICATIONS USING BUFFER URGENCY FACTOR - A code division multiple access (CDMA) user device configured to dynamically allocating at least at least one wireless communication channel to permit a more efficient allocation of wireless communication channels when providing high speed data service. The CDMA user device is configured to receive data traffic from at least one data buffer in a base station. The CDMA user device is dynamically allocated at least one wireless communication channel based on an urgency factor. The urgency factor indicates the urgency of traffic data to be transmitted from the at least one data buffer in the base station to the CDMA user device. | 07-18-2013 |
20130176994 | CODED REVERSE LINK MESSAGES FOR CLOSED-LOOP POWER CONTROL OF FORWARD LINK CONTROL MESSAGES - A field unit includes circuitry configured to receive a signal and determine whether the received signal has a predetermined quality; circuitry configured to select a signal from a plurality of signals including a first signal indicating that the field unit is requesting an assignment of resources and the received signal was received with the predetermined quality, a second signal indicating that the field unit is requesting an assignment of resources and the received signal was not received with the predetermined quality, a third signal indicating that the field unit is not requesting an assignment of resources and the received signal was received with the predetermined quality, and a fourth signal indicating that the field unit is not requesting an assignment of resources and the received signal was not received with the predetermined quality; and circuitry configured to transmit the selected signal over a control channel. | 07-11-2013 |
20130143551 | DUAL MODE UNIT FOR SHORT RANGE, HIGH RATE AND LONG RANGE, LOWER RATE DATA COMMUNICATIONS - A technique for communication with a local area network (LAN) via a wireless connection determines whether a first short-range, high-speed, wireless communication path is available and connects to the LAN using a longer range, lower speed wireless communication path if the short-range, high-speed wireless communication path is not available. The low-range, high-speed wireless communication path is a wireless communication path is a wireless LAN connection such as an IEE 802.11-compliant wireless LAN and the long-range, low-sped wireless communication mode is a cellular CDMA-type connection. Determining whether the first IEEE 802.11 mode is available can be done by detecting a beacon signal, or transmitting a probe request message and detecting a probe response message in response to the probe request, indicating the presence or availability of the short-range, high-speed wireless communication path. Alternatively, the availability of short-range, high-speed wireless communication path can be detected by simply detecting activity on it. | 06-06-2013 |
20130121251 | METHOD FOR SEARCHING PILOT SIGNALS TO SYNCHRONIZE A CDMA RECEIVER WITH AN ASSOCIATED TRANSMITTER - A wireless transmit-receive unit includes an antenna, detection circuitry configured to detect a pseudorandom (PN) offset of a pilot signal received by the antenna while the antenna is adapted to an omnidirectional receive pattern, and monitoring circuitry configured to monitor a received signal strength of the pilot signal as a directional receive pattern of the antenna is steered in order to determine an azimuth angle of the directional pattern that maximizes the pilot signal at the detected PN offset. | 05-16-2013 |
20130064232 | TECHNIQUES FOR REDUCING OVERHEAD IN A COMMUNICATIONS SYSTEM - Parallel demodulators are provided in field units. Forward and reverse channel allocation information may be broadcast to the field units in the same epoch as traffic data but on first and second channels, such as paging and traffic channels. This assures that all field units are able to receive forward and reverse channel allocation information every epoch. By having parallel demodulators in the field unit, switching between the first and second channels is avoided and channel allocation information is not lost. | 03-14-2013 |
20130003636 | SYSTEM AND METHOD FOR COORDINATION OF WIRELESS MAINTENANCE CHANNEL POWER CONTROL - In a wireless communication system, there are several wireless channels used for communication between users and a base station. Channel characteristics may be defined by whether a channel is carrying traffic data and the timing of the channel transmissions with respect to channels not carrying traffic data. Different power levels between channels carrying traffic data or not may be defined and individual power levels of each channel may be amended based on individual power level command responses. | 01-03-2013 |
20120320901 | USE OF ORTHOGONAL OR NEAR ORTHOGONAL CODES IN REVERSE LINK - An apparatus and method for use with a shared access communication channel is disclosed. A wireless network device receives signals and recovers data from a first plurality of subscriber units and a second plurality of subscriber units in a time interval. Received signals from the first plurality of subscriber units are distinguishable by having unique pseudo noise (PN) sequence with respect to others of the first plurality of subscriber units. Received signals the second plurality of subscriber units are distinguishable by a unique orthogonal sequence with respect to others of the second plurality of subscriber units. Received signals are distinguished between the first and second plurality of subscriber units based on detection of an orthogonal sequence present only in the received signals from the second plurality of subscriber units. | 12-20-2012 |
20120307809 | ALTERNATE CHANNEL FOR CARRYING SELECTED MESSAGE TYPES - A method is implemented by a subscriber unit in a wireless communication for establishing a network session. The subscriber unit encodes an acknowledgment message for transmission on a shared reverse link channel to a base station. Acknowledgment information associated with a received session tag at the subscriber unit to the base station is transmitted over the shared reverse link channel, on a condition that the session tag is received from a network server via the base station on a forward link channel and identified by the subscriber unit. The acknowledgment is transmitted on a reverse traffic channel on a condition that the session ID tag is not identified by the subscriber unit. | 12-06-2012 |
20120307804 | DYNAMIC BANDWIDTH ALLOCATION TO TRANSMIT A WIRELESS PROTOCOL ACROSS A CODE DIVISION MULTIPLE ACCESS (CDMA) RADIO LINK - A technique for transmission of wireless signals across CDMA radio links. Bandwidth is allocated dynamically within a session to specific CDMA subscriber unit based upon data rate determinations. Specifically, a dynamic bandwidth allocation algorithm operates from limits calculated based upon available ports per subscriber, expected user bandwidth, and parallel user bandwidth versus throughput. Provisions for priority service, unbalanced forward and reverse spectrum utilization, voice prioritization, and band switching are also made. | 12-06-2012 |
20120289234 | HANDOFF TO BASE STATION HAVING ENHANCED CAPABILITIES - A method and a wireless transmit/receive unit perform a handoff to a target base station having enhanced capabilities. A dual mode manager triggers a capabilities query for information regarding enhanced capability of the target base station, wherein the enhanced capability includes transmission in accordance with a high speed data mode. A generator sends the query to a server connected to the Internet via a first base station not having enhanced capability. The dual mode manager receives from the server via the first base station information regarding the enhanced capability. A handoff to the target base station is initiated by the dual mode manager on a condition that the received information indicates that the target base station has enhanced capability. The dual mode manager deactivates a first mode of operation for communication with the first base station and activates the high speed data mode for communication with the target base station. | 11-15-2012 |
20120269177 | FAST SWITCHING OF FORWARD LINK IN WIRELESS SYSTEM - A technique for distributing channel allocation information in a demand access communication system. Multiple access codes are used that have a defined code repeat period or code epoch. For each such epoch duration, a schedule of assignment of traffic channels to active terminals for each epoch is determined. For each terminal designated as active during the epoch, a list of active channels for such terminal unit is assigned. Prior to the start of each epoch, a channel set up message is sent on one of the forward link channels, such as a paging channel, indicating the lists of active channels for epochs of the associated traffic channel(s) that are to follow. | 10-25-2012 |
20120269176 | VARIABLE RATE CODING FOR FORWARD LINK - A forward error correction (FEC) block size is maintained at a constant size. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. Therefore, as the number of information bits per symbol is changed, the number of output bits is always maintained. The scheme permits for a greater flexibility and selection of effective data rates. | 10-25-2012 |
20120250798 | MAXIMIZING DATA RATE BY ADJUSTING CODES AND CODE RATES - The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (PN) encoded CDMA system. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. A forward error correction (FEC) block size is maintained at a constant amount. Therefore, as the number of information bits per symbol are increased, an integer multiple of bits per epoch is always maintained. The scheme permits for a greater flexibility and selection of effective data rates providing information bit rates ranging from, for example, approximately 50 kilobits per second to over 5 mega bits per second (Mbps) in one preferred embodiment. | 10-04-2012 |
20120218985 | USE OF CORRELATION COMBINATION TO ACHIEVE CHANNEL DETECTION - Combinations of correlation results are used to achieve detection of multiple coded signals at a receiver in a wireless communications system. The code applied to signals includes a lower rate code and a higher rate code. The lower rate code is a nested or tiered code such that it comprises at least two code sequences of the higher rate code. The received coded signal is correlated with the higher rate code using a single higher rate correlator to provide a higher rate code correlation result. The higher rate code correlation results are fed to two or more lower rate code correlators that combine multiple higher rate code correlation results, each using a different lower rate code, to provide corresponding lower rate code correlation results. The presence of at least one coded signal or mutually exclusive coded signals can be determined from the lower rate code correlation results. | 08-30-2012 |
20120201199 | ANTENNA CONTROL SYSTEM AND METHOD - A subscriber unit, including an antenna array and an antenna array interface coupled to the antenna array, is described. Wireless transmissions, at least two of which are based on different directional transmissions from a transmitter, are received at the antenna array. Feedback messages are generated using the antenna array interface. The feedback messages are communicated using the antenna array to adjust settings of the transmitter. | 08-09-2012 |
20120170484 | SIGNALING FOR WIRELESS COMMUNICATIONS - A communication system, such as a wireless CDMA system, detects markers with fewer errors by having field units transmit the markers at different power levels (e.g., 9 dB for one marker and 11 dB for another marker). The difference in power levels of the markers allows the base station to identify the request markers using alternative criteria with a low probability of error, where the alternative criteria may include comparing the markers to respective energy level thresholds, monitoring occupancy of time slots, occupancy of mutually exclusive code channels, or combinations thereof. For example, in one particular embodiment, a request marker, which is generally a high priority marker, is transmitted with higher power, which improves the probability of detection and reduces the probability of false detection of the request marker. | 07-05-2012 |
20120134343 | WIRELESS CHANNEL ALLOCATION IN A BASE STATION PROCESSOR - A system and method are provided for allocating wireless channels in a base station processor to messages sent between a subscriber and the base station processor in a wireless network. A latency period is determined corresponding to a return message to be received from a responsive node in response to an outgoing message sent from a sender via the base station processor. A latency manager in the base station processor computes the latency period and stores the latency period in an allocation table. A scheduler schedules a channel to be available at the end of the latency period indicated in the allocation table. At the end of the latency period, the return message is received and the scheduler allocates a channel as defined in the allocation table. The scheduled channel is used to transmit the message to or from the corresponding subscriber. | 05-31-2012 |
20120134341 | MAINTAINING A MAINTENANCE CHANNEL IN A REVERSE LINK OF A WIRELESS COMMUNICATIONS SYSTEM - In a reverse link of a wireless CDMA communication system, a method of maintaining an idling mode connection between a field unit and a base transceiver station is provided using various techniques to maintain the idle mode connection at a reduced power level. A preferred embodiment computes a time slot or frame offset based on modulo function using a field unit identifier in order to distribute field unit maintenance transmissions among available slots or offsets. An alternate embodiment detects explicit signaling states changes at the physical layer and causes power target changes. A further embodiment transmits maintenance data during predetermined time intervals, coordinated between the field units and BTS, allowing power levels to be adjusted accordingly. | 05-31-2012 |
20120093131 | MINIMAL MAINTENANCE LINK TO SUPPORT SYCHRONIZATION - A method for use in a field unit operable in a wireless communication network. The method includes receiving an indication of a plurality of access identifiers from a base station. The field unit selects an access identifier from the plurality of access identifiers received from the base station. The selected access identifier is associated with a type of field unit request. The field unit transmits the selected access identifier to the base station. The field unit then receives a message from the base station. The message is based on the transmitted selected access identifier. The message contains a timing adjustment that indicates an amount to advance timing. A corresponding field unit apparatus, a base station method, and corresponding base station apparatus is also disclosed. | 04-19-2012 |
20120087364 | REVERSE LINK PILOT INTEGRATED WITH BLOCK CODES - A technique for encoding digital communication signals. Data symbols are augmented in pilot symbols inserted at predetermined positions. The pilot augmented sequence is then fed to a deterministic error correction block encoder, such as a turbo product coder, to output a coded sequence. The symbols in the error correction encoded sequence are then rearranged to ensure that the output symbols derived from input pilot symbols are located at regular, predetermined positions. As a result, channel encoding schemes can more easily be used which benefits from power of two length block sizes. | 04-12-2012 |
20120087353 | AUTOMATIC REVERSE CHANNEL ASSIGNMENT IN A TWO-WAY TDM COMMUNICATION SYSTEM - A method and apparatus for communication is disclosed. Information is received on a downlink channel in a time interval. On a condition that an explicit allocation of a first uplink channel is received, feedback information regarding the received information is transmitted on the first uplink channel, wherein the feedback information is transmitted with user data on the first uplink channel. On a condition that an explicit allocation of the first uplink channel is not received, feedback information regarding the received information is transmitted in a time interval on a second uplink channel, wherein an explicit allocation of the second uplink channel is not received, wherein the time interval on the second uplink channel is a pre-determined time period away from the time interval on the downlink channel. | 04-12-2012 |
20120087325 | POWER CONTROL PROTOCOL FOR HIGHLY VARIABLE DATA RATE REVERSE LINK OF WIRELESS COMMUNICATION SYSTEM - A subscriber unit performs power control of a reverse link by sending heartbeat messages to a base station, permitting the base station to determine a reverse link quality report. Using a reverse link quality report message received from the base station, the subscriber unit calculates its reverse power level and maintains the reverse power level during the standby state. | 04-12-2012 |
20120076113 | TRANSMITTING ACKNOWLEDGEMENT MESSAGES USING A STAGGERED UPLINK TIME SLOT - A downlink communication is transmitted/received in at least one downlink time slot. In response to the received downlink communication, an acknowledgement message is received/transmitted in an uplink time slot a fixed integer number of uplink time slots after transmission/reception of the received downlink communication. The uplink and downlink time slots are staggered by substantially a half of a time slot. | 03-29-2012 |
20120042223 | FORWARD ERROR CORRECTION SCHEME FOR HIGH RATE DATA EXCHANGE IN A WIRELESS SYSTEM - A transmitter/receiver system for high data transfer in a wireless communication system includes a physical layer processor that comprises an FEC coder, a demultiplexer and a plurality of modem processors. The FEC coder applies error correction codes to the high data rate signal. Thereafter, the demultiplexer distributes portions of the coded high data rate signal to the modem processors. Each modem processor processes its respective portion of the coded signal for transmission in an independent channel. | 02-16-2012 |
20120039328 | VARIABLE RATE CODING FOR ENABLING HIGH PERFORMANCE COMMUNICATION - A protocol for optimizing the use of coded transmissions such as over wireless links. In this technique, interframes are split into segments selected to be an optimum size according to transmission characteristics of the radio channel. The inverse process is applied at the receiver. Using this scheme, segments containing erroneous data may be resent. | 02-16-2012 |
20110299506 | MAINTENANCE OF CHANNEL USAGE IN A WIRELESS COMMUNICATION SYSTEM - Data is accessed from a network via a wireless communication link. A determination is made as to whether payload data has been received from a subscriber's terminal. If so, then a request is sent for a first set of traffic channels, and the payload data is transmitted over the first set of traffic channels. | 12-08-2011 |
20110216707 | APPLICATION SPECIFIC TRAFFIC OPTIMIZATION IN A WIRELESS LINK - A packet data system such as a TCP/IP network transmits packets containing a variety of data types along links in the network. Packets are transmitted in a stream between nodes interconnected by the links connections which conform to a transport layer protocol such as TCP, UDP, and RSTP, and includes wireless links, which transmit packets using a radio frequency (RF) medium. Typical protocols, however, are usually developed to optimize throughput and minimize data error and loss over wired links, and do not lend themselves well to a wireless link. By examining the data in a packet, performance characteristics such as a port number are determined. The performance characteristics indicate the application type, and therefore, the data type, of the packets carried on the connection. Since certain data types, such as streaming audio and video, are more loss tolerant, determination of the data type is used to compute link control parameters for the wireless link which that are optimal to the type of data being transmitted over the link. | 09-08-2011 |
20110216679 | SIGNAL INTERFACING TECHNIQUES TO SIMPLIFY INTEGRATED CIRCUIT RADIO DESIGNS - A signal interfacing technique for connecting signals between a signal processing device and a MIMO radio integrated circuit (IC) involving multiplexing two or more signals on a connection pin between the radio IC and a signal processing device. According to one technique, transmit and receive signals are multiplexed such that during a transmit mode a transmit signal is coupled on the connection pin from the signal processing device to the radio IC, and during a receive mode a receive signal is coupled from the radio IC on the connection pin to the signal processing device. According to another technique, in-phase (I) and quadrature (Q) signals are multiplexed on a connection pin during both transmit and receive modes. | 09-08-2011 |
20110200027 | TWO TIER HI-SPEED WIRELESS COMMUNICATION LINK - A method and apparatus for mobile two-tier wireless communication are provided. A wireless communication signal may be received at a mobile communication device from a cellular base station. Data may be recovered from the received wireless communication signal. The data may be transmitted to an IEEE 802.11 user device. A second wireless communication signal may be received from the IEEE 802.11 user device. Data may be recovered from the second wireless communication signal. The data may be transmitted to the cellular base station. | 08-18-2011 |
20110200017 | GRADE OF SERVICE AND FAIRNESS POLICY FOR BANDWIDTH RESERVATION SYSTEM - A scheme and a method for assigning priority levels to users based upon a history of their request for access to the resources is disclosed. If a user has, over a historical period of time, made fewer demands than a stated amount, that user is given a higher priority than a user who has made greater use of the resources than their stated amount. Thus, users making the heaviest demand on the available resources are allocated fewer resources despite their demand, whereas users that make less demands for the resources are granted more of the resources they request. | 08-18-2011 |
20110194537 | TIME-SLOTTED DATA PACKETS WITH A PREAMBLE - A method and apparatus are used to support the transmission of data to a user over multiple allocated data channels. Data packets are transmitted in time-slots of the allocated data channels to corresponding target receivers without the need for explicitly assigning particular time-slots to a target user well in advance of transmitting any data packets in the time-slots. Instead, each data packet transmitted in a time-slot includes a header label or preamble indicating to which of multiple possible receivers a data packet is directed. The preamble also preferably includes decoding information indicating how a corresponding data payload of the data packet is to be processed for recapturing transmitted raw data. | 08-11-2011 |
20110170493 | METHOD FOR SEARCHING PILOT SIGNALS TO SYNCHRONIZE A CDMA RECEIVER WITH AN ASSOCIATED TRANSMITTER - A method for synchronizing a CDMA receiver to a transmitter when an adaptive antenna is utilized to receive transmitted data, wherein a receiving antenna system is adapted between a 360° reception angle pattern (i.e., an omni-directional pattern) and a fixed reception angle (i.e., a directional pattern) by permitting the receiver to identify a pilot signal having the largest magnitude. The receiver minimizes interference from other pilot signals by steering antenna pattern nulls toward other transmitters. As a result, the time required for the receiver to acquire a valid pilot signal is significantly reduced. | 07-14-2011 |
20110170467 | METHOD AND APPARATUS FOR ALLOWING SOFT HANDOFF OF A CDMA REVERSE LINK UTILIZING AN ORTHOGONAL CHANNEL STRUCTURE - Method and apparatus for base stations and subscriber units allows soft handoff of a CDMA reverse link utilizing an orthogonal channel structure. Subscriber units transmit an orthogonally coded signal over a reverse link to the base stations. A given base station provides timing control of the timing offset of the reverse link signal. Based on at least one criterion, an alignment controller determines that the given base station should hand off timing control to another base station, and a soft handoff process ensues. In response to a command or message for soft handoff of the subscriber unit from the given base station to another base station, the subscriber unit makes a coarse timing adjustment to the timing of the coded signal. The subscriber unit may make fine timing adjustments based on feedback from the base station controlling timing. Multiple base stations may provide power control feedback to the subscriber unit. | 07-14-2011 |
20110105054 | MASTER-SLAVE LOCAL OSCILLATOR PORTING BETWEEN RADIO INTEGRATED CIRCUITS - A technique to share a local oscillator signal between two radio frequency integrated circuits (RFICs). The local oscillator signal generated internally by one RFIC is ported to the other RFIC for use in transmit or receive operation. The local oscillator signal that is ported may be an RF local oscillator signal. Each RFIC may include a bi-directional port circuit that can be operated to make the RFIC a master, slave or may be totally disabled to disable the porting feature. This is particularly useful in RFICs that are used to communicate using MIMO radio algorithms which rely for optimum performance on phase and frequency coherency among a plurality of transmitters and a plurality of receivers. | 05-05-2011 |
20110044221 | SYSTEM AND METHOD FOR COORDINATION OF WIRELESS MAINTENANCE CHANNEL POWER CONTROL - In a wireless communication system, wireless channels are maintained for communication between users and the base station. Often, a wireless user may be switched on, but not actively sending or receiving data. Accordingly, wireless users may be “active,” and currently allocated a wireless traffic channel for sending or receiving, or “idle,” and not currently sending or receiving. A wireless user may be maintained in an idle state through a periodic sequence of synchronization messages. A method for controlling a power level of a wireless message includes determining the presence of data to be transmitted, and adjusting the power level of the synchronization message depending on the presence of data. The synchronization messages corresponding to the idle state employ a lower power level than the active state transmissions which employ a higher power level. The system therefore controls the power accordingly such that synchronization messages are sent at a lower power level when no data is present, thereby reducing power consumption and interference. | 02-24-2011 |
20100202425 | DUAL MODE UNIT FOR SHORT RANGE, HIGH RATE AND LONG RANGE, LOWER RATE DATA COMMUNICATIONS - A technique for communication with a local area network (LAN) via a wireless connection determines whether a first short-range, high-speed, wireless communication path is available and connects to the LAN using a longer range, lower speed wireless communication path if the short-range, high-speed wireless communication path is not available. The low-range, high-speed wireless communication path is a wireless communication path is a wireless LAN connection such as an IEE 802.11-compliant wireless LAN and the long-range, low-sped wireless communication mode is a cellular CDMA-type connection. Determining whether the first IEEE 802.11 mode is available can be done by detecting a beacon signal, or transmitting a probe request message and detecting a probe response message in response to the probe request, indicating the presence or availability of the short-range, high-speed wireless communication path. Alternatively, the availability of short-range, high-speed wireless communication path can be detected by simply detecting activity on it. | 08-12-2010 |
20100202317 | POWER CONTROL PROTOCOL FOR HIGHLY VARIABLE DATA RATE REVERSE LINK OF A WIRELESS COMMUNICATION SYSTEM - A subscriber unit performs power control of a reverse link by sending heartbeat messages to a base station, permitting the base station to determine a reverse link quality report. Using a reverse link quality report message received from the base station, the subscriber unit calculates its reverse power level and maintains the reverse power level during the standby state. | 08-12-2010 |
20100157966 | THROUGHPUT IN MULTI-RATE WIRELESS NETWORKS USING VARIABLE-LENGTH PACKETS AND OTHER TECHNIQUES - In a wireless communication network having a plurality of devices operating at different data rates that contend for access to the network, an apparatus is provided that assigns network access parameters so as to control throughput on the network. | 06-24-2010 |
20100099366 | MULTIPLE-INPUT MULTIPLE-OUTPUT RADIO TRANSCEIVER - A MIMO radio transceiver to support processing of multiple signals for simultaneous transmission via corresponding ones of a plurality of antennas and to support receive processing of multiple signals detected by corresponding ones of the plurality of antennas. The radio transceiver provides, on a single semiconductor integrated circuit, a receiver circuit or path for each of a plurality of antennas and a transmit circuit or path for each of the plurality of antennas. Each receiver circuit downconverts the RF signal detected by its associated antenna to a baseband signal. Similarly, each transmit path upconverts a baseband signal to be transmitted by an assigned antenna. | 04-22-2010 |
20100011272 | VARIABLE RATE CODING FOR ENABLING HIGH PERFORMANCE COMMUNICATION - A protocol for optimizing the use of coded transmissions such as over wireless links. In this technique, interframes are split into segments selected to be an optimum size according to transmission characteristics of the radio channel. The inverse process is applied at the receiver. Using this scheme, segments containing erroneous data may be present. | 01-14-2010 |
20090296848 | JOINT MAXIMAL RATIO COMBINING USING TIME-DOMAUIN BASED SIGNAL PROCESSING - A communication device transmits and receives communication signals with another communication device via a plurality of antennas, a plurality of transmit tapped delay-line filters, a plurality of receive tapped delay-line filters, a combiner/analyzer with a plurality of filters for signal processing; and a plurality of computation blocks. The computation blocks determine complex weights for the tapped delay-line filters for optimizing the received signal-to-noise ratio and the range of communication of the communication device. | 12-03-2009 |
20090285331 | CONTROL OF POWER AMPLIFIERS IN DEVICES USING TRANSMIT BEAMFORMING - A radio transmitter and method controls efficiency of each of a plurality of power amplifiers that amplify a corresponding one of a plurality of radio frequency signals for a beamforming transmission by a corresponding one of a plurality of antennas. Each of the plurality of power amplifiers is controlled to operate with one or more operating parameters that optimize the efficiency for an output power level of corresponding ones of the radio frequency signals. Transmit weights for transmit signals are determined and updated on a per-packet basis. | 11-19-2009 |
20090285146 | METHODS FOR IMPROVING RANGE FOR MULTICAST WIRELESS COMMUNICATION - An extended range mode for wireless communication of a multicast data signal from an access point (AP) to multiple stations (STAs) may be enabled or disabled. When the extended range mode is enabled, the AP transmits the data signal up to a total of N times using a transmit delay diversity, where N is the number of transmit antennas. | 11-19-2009 |
20090284434 | ADAPTIVE ANTENNA FOR USE IN WIRELESS COMMUNICATION SYSTEMS - An antenna apparatus, which can increase capacity in a cellular communication system or Wireless Local Area Network (WLAN), such as an 802.11 network, operates in conjunction with a mobile subscriber unit or client station. At least one antenna element is active and located within multiple passive antenna elements. The passive antenna elements are coupled to selectable impedance components for phase control of re-radiated RF signals. Various techniques for determining the phase of each antenna element are supported to enable the antenna apparatus to direct an antenna beam pattern toward a base station or access point with maximum gain, and, consequently, maximum signal-to-noise ratio. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference. | 11-19-2009 |
20090268705 | DYNAMIC BANDWIDTH ALLOCATION TO TRANSMIT A WIRELESS PROTOCOL ACROSS A CODE DIVISION MULTIPLE ACCESS (CDMA) RADIO LINK - A technique for transmission of wireless signals across CDMA radio links. Bandwidth is allocated dynamically within a session to specific CDMA subscriber unit based upon data rate determinations. Specifically, a dynamic bandwidth allocation algorithm operates from limits calculated based upon available ports per subscriber, expected user bandwidth, and parallel user bandwidth versus throughput. Provisions for priority service, unbalanced forward and reverse spectrum utilization, voice prioritization, and band switching are also made. | 10-29-2009 |
20090262708 | AUTOMATIC REVERSE CHANNEL ASSIGNMENT IN A TWO-WAY TDM COMMUNICATION SYSTEM - To minimize overhead in the allocation of channels, forward and reverse link time slots are automatically assigned in pairs. In particular, rather than requiring a separate process for allocating reverse link channels for the sending of acknowledgment messages in response to receipt of a forward link packet, a different scenario takes place. At the receiving end, such as for valid reception of data on a forward link channel at a central base station site, a reverse link time slot is automatically allocated in a time slot which depends upon the time slot allocation on the forward link. This assists with the rapid return of acknowledgment messages in a reverse link direction which is the predominant direction for such messages in a wireless system wherein most data traffic is Web page oriented. | 10-22-2009 |
20090257479 | USE OF CORRELATION COMBINATION TO ACHIEVE CHANNEL DETECTION - Combinations of correlation results are used to achieve detection of multiple coded signals at a receiver in a wireless communications system. The code applied to signals includes a lower rate code and a higher rate code. The lower rate code is a nested or tiered code such that it comprises at least two code sequences of the higher rate code. The received coded signal is correlated with the higher rate code using a single higher rate correlator to provide a higher rate code correlation result. The higher rate code correlation results are fed to two or more lower rate code correlators that combine multiple higher rate code correlation results, each using a different lower rate code, to provide corresponding lower rate code correlation results. The presence of at least one coded signal or mutually exclusive coded signals can be determined from the lower rate code correlation results. | 10-15-2009 |
20090239486 | APPARATUS FOR ANTENNA DIVERSITY USING JOINT MAXIMAL RATIO COMBINING - A method for improving performance of radio frequency (RF) communication of a station (STA) having an access point (AP) is disclosed. The method includes using an arbitrary set of transmit antenna weights, calculating a set of receive antenna weights, and updating the transmit antenna weights based on the receive antenna weights. | 09-24-2009 |
20090238119 | WIRELESS COMMUNICATION SYSTEM HAVING MOBILITY-BASED CONTENT DELIVERY - A portable subscriber access unit includes a wireless transceiver and a processor. The processor controls the transceiver, determines a mobility state of the access unit, and determines a data packet content type. The transceiver transmits the mobility state, receives service rights based on the mobility state, and transmits the data packet on a condition that the content type is allowed by the service rights. | 09-24-2009 |
20090225718 | TECHNIQUES FOR SETTING UP TRAFFIC CHANNELS IN A COMMUNICATIONS SYSTEM - A control channel supporting traffic control in epochs is divided into two control subchannels each being less than or equal to about a half epoch in duration and occurring serially in time. Slot allocation data may be transmitted and received independently over the subchannels. One subchannel may be used for transmitting forward slot allocation data and the other subchannel may be used for transmitting reverse slot allocation data. The channel split into two subchannels may be a paging channel. The forward and reverse slot allocation data may be transmitted between a base station processor and field unit. Forward and reverse traffic data may be staggered by at least about half an epoch. Transmission of traffic data happens within about two epochs after the assignments. | 09-10-2009 |
20090213905 | USE OF ORTHOGONAL OR NEAR ORTHOGONAL CODES IN REVERSE LINK - An apparatus for use with a shared access communication channel is disclosed. The chipping rate of a first group of terminals is determined. Transmissions on the shared access communication channel are encoded using first pseudorandom noise (PN) code and a phase shift at the first chipping rate and an orthogonal spreading code having a chipping rate less than the first chipping rate. The apparatus may receive a feedback channel assignment and may receive an indication of a change in timing on the assigned feedback channel. | 08-27-2009 |
20090175249 | ALTERNATE CHANNEL FOR CARRYING SELECTED MESSAGE TYPES - A method for communicating information in a base station is disclosed. A reverse link channel is allocated to be a shared acknowledgement channel for receiving acknowledgement information. Acknowledgement information associated with data payload from a field unit is then received over the shared acknowledgement channel by the base station. | 07-09-2009 |
20090116469 | Reverse link pilot integrated with block codes - A technique for encoding digital communication signals. Data symbols are augmented in pilot symbols inserted at predetermined positions. The pilot augmented sequence is then fed to a deterministic error correction block encoder, such as a turbo product coder, to output a coded sequence. The symbols in the error correction encoded sequence are then rearranged to ensure that the output symbols derived from input pilot symbols are located at regular, predetermined positions. As a result, channel encoding schemes can more easily be used which benefits from power of two length block sizes. | 05-07-2009 |
20090097455 | ACCESS CHANNEL STRUCTURE FOR WIRELESS COMMUNICATION SYSTEM - A technique for efficient implementation of pilot signals on a reverse link in a wireless communication system. An access channel is defined for the reverse link such that within each frame, or epoch, a portion is dedicated to sending only pilot symbols. Another portion of the frame is reserved for sending mostly data symbols; however, within this second portion of the frame, additional pilot symbols are interleaved among the data symbols. The pilot symbol or preamble portion of the access channel frame allows for efficient acquisition of the access signal at the base station, while providing a timing reference for determining the effects of multipath fading. In particular, a pilot correlation filter provides a phase estimate from the pilot symbols in the preamble portion, which is then used to decode the data symbols in the payload portion. An access acquisition portion of the receiver uses the phase estimates provided by the pilot correlation filter to process the output of a data symbol correlation filter. The additional pilot symbols embedded in the payload portion are used in a cross product operation to further resolve the effects of multipath fading. | 04-16-2009 |
20090060005 | Method for using a non-orthogonal pilot signal with data channel interference cancellation - A system and method for encoding/decoding data channels in a CDMA system having data channel interference cancellation, wherein data channel interference cancellation is used to remove unwanted non-orthogonal pilot signal components which are present within a demodulated data signal. This is accomplished by regenerating interference terms with respect to the non-orthogonal pilot signal and subtracting them from the demodulated data signal. | 03-05-2009 |
20090010368 | VARIABLE RATE CODING FOR FORWARD LINK - A technique for encoding a signal used in a digital communication system in which individual traffic channel data rates may be adapted to specific channel conditions. In particular, a forward error correction coding rate is adapted for individual channels while at the same time maintaining a fixed block size independent of the FEC coding rate. This allows the system data rate to adapt to the channel conditions experienced by a specific user. Thus, users experiencing good communication conditions with low multipath distortion may be allocated higher capacity, whereas users with significant multipath distortion may make use of lower rate (higher levels of coding) error codes to maintain high quality. Messages are sent from a transmitter to a receiver to inform the receiver of the coding rate implemented at any given point in time. These parameters may be adjusted independent of transmitted power level through the expedient of ensuring that size of a transmitted frame remains constant, while permitting the ability to change FEC coding rates and FEC block sizes. | 01-08-2009 |
20080225991 | Method for searching pilot signals to synchronize a CDMA receiver with an associated transmitter - A method for synchronizing a CDMA receiver to a transmitter when an adaptive antenna is utilized to receive transmitted data, wherein a receiving antenna system is adapted between a 360° reception angle pattern (i.e., an omni-directional pattern) and a fixed reception angle (i.e., a directional pattern) by permitting the receiver to identify a pilot signal having the largest magnitude. The receiver minimizes interference from other pilot signals by steering antenna pattern nulls toward other transmitters. As a result, the time required for the receiver to acquire a valid pilot signal is significantly reduced. | 09-18-2008 |