|| List of recent Downlink-related patents
| Method and apparatus for notifying starting symbol of physical downlink shared channel|
Embodiments of the present invention provide a method and apparatus for determining a starting symbol of a physical downlink shared channel; wherein, a pico base station transmits information indicating a pdsch starting symbol of the pico base station to a macro base station, the macro base station transmits the information indicating a pdsch starting symbol to a terminal, and the terminal determines the pdsch starting symbol in accordance with the information indicating a pdsch starting symbol. With the embodiments of the present invention, the terminal within a serving range of the pico base station resulted from a high offset value will not incorrectly decode a pcfich due to interference of the macro base station, thereby making the terminal determine a demarcation symbol between a pdcch and a pdsch, further increasing the coverage of the pico base station, and realizing load balancing of the macro base station and pico base station..
| Timing and cell specific system information handling for handover in evolved utra|
A method and apparatus for reducing handover time includes a wireless transmit receive unit receiving cell specific information in a downlink signal. The downlink signal is one of a set of signals included in a handover process..
| Systems and methods for using enhanced receiver and gaps when handling interference|
Systems and methods that enable use of enhanced receiver techniques together with measurement gaps for measuring or reading a signal or channel from a target cell are disclosed. In one embodiment, a wireless device has an enhanced receiver and operates to measure interference from a first cell during one or more gaps created for a second cell to thereby obtain one or more interference measurements and then mitigate the interference during reception of a signal from a cell other than the first cell based on the one or more interference measurements using an enhanced receiver technique.
| System and methods for reducing uplink resources to provide channel performance feedback for adjustment of downlink mimo channel data rates|
Systems and methods for improving the performance of a mimo wireless communication system by reducing the amount of uplink resources that are needed to provide channel performance feedback for the adjustment of data rates on the downlink mimo channels. In one embodiment, a method comprises encoding each of a set of data streams according to corresponding data rates, permuting the data streams on a set of mimo channels according to a full permutation of combinations, transmitting the permuted data streams, receiving the permuted data streams, decoding and determining an snr for each of the data streams, computing a condensed snr metric for the set of data streams, providing the condensed metric as feedback, determining a set of individual snr metrics for the data streams based on the condensed snr metric, and adjusting the data rates at which the data streams are encoded based on the individual snr metrics..
The invention relates to an apparatus including at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: choose more than one subframes from subframes targeted to at least two of the following: physical uplink control channel acknowledgement/no-acknowledgement signaling, physical hybrid automatic repeat request indicator channel acknowledgement/no-acknowledgement signaling, physical uplink shared channel resource allocation grant signaling, physical downlink shared channel resource allocation grant signaling, and form a periodic signaling pattern to obtain a flexible subframe configuration for uplink and downlink signaling by using the chosen more than one subframes.. .
| Method and apparatus for closed loop transmit diversity transmission initial access|
Uplink precoding in closed loop transmit diversity (cltd). The methods and apparatus relate to precoder operations during an initial stage using default precoder tap weights, and a second stage wherein precoder weights obtained from a precoder control indicator channel information are used, provided the signal quality of the precoder control indicator channel is sufficiently reliable.
| Base station device, terminal device, resource allocation method and response signal transmission method|
A base station apparatus is disclosed in which control section (150) generates an index indicating a response signal resource to be used for transmission of a response signal in response to downlink data of a plurality of ccs for at least each second cc, and transmitting section (160) transmits control information including the index. When a terminal receives the control information using only one second cc or two or more ccs among the plurality of ccs, the terminal apparatus determines the response signal resource based on the index of the second cc.
| Method of downlink signal transport over backhaul communications through distributed processing|
The amount of multi-antenna signals to be transmitted over the backhaul in a coordinated multipoint (comp) system from the central processor (cp) to each base station is reduced. Embodiments of the present invention exploit characteristics of the underlying signal structure, and distribute some baseband processing functionalities—such as channel coding and the application of the multi-user precoding—from the cp to the remote base stations.
| Terminal device, and buffer partitioning method|
Disclosed is a terminal apparatus in which: a decoding section (210) that stores, in a retransmission buffer, downlink data transmitted by each of the plurality of component carriers and decodes the downlink data; and a radio transmitting section (222) that transmits, using a first component carrier of the plurality of component carriers, a response signal for first downlink data received using the first component carrier and a response signal for second downlink data received using a second component carrier of the plurality of component carriers, in addition, a second buffer is divided into regions respectively corresponding to retransmission processes based on a specific value determined by a combination of a first configuration pattern that is set in the first component carrier and a second configuration pattern that is set in the second component carrier.. .
| Systems and methods for enhancing uplink coverage in interference scenarios|
A method and apparatus are for communication in a wireless network in which a user equipment (ue) associated with a first evolved node b (enb) experiences interference from a second enb. The method includes negotiating by the first enb of the wireless network with a second enb of the wireless network for a partitioning of subband resources on an uplink.
| Method and apparatus for controlling rate of voice service in a mobile communication system supporting voice service via packet network|
A method for controlling a rate of a voice service in a mobile communication system supporting the voice service via a packet network. The method includes the steps of receiving a control message at a terminal from a radio network controller (rnc); if the control message indicates control of a downlink rate, determining a downlink rate according to the control message; setting a change mode request (cmr) field of an uplink voice over internet protocol (voip) packet according to the downlink rate, and transmitting the uplink voip packet from the terminal to the rnc; if the received control message indicates control of an uplink rate, determining an uplink rate according to the control message; and generating an uplink voip packet including uplink voice data generated according to the determined uplink rate and frame type (ft) information indicating the determined uplink rate, and transmitting the uplink voip packet from the terminal to the rnc..
| Method and apparatus of allocating uplink feedback channel for feeding data corresponding to an enhanced-physical downlink control channel (e-pdcch)|
Provided is an uplink feedback channel allocation method and apparatus used to feedback data to indicate whether data packets corresponding an enhanced physical downlink control channel (e-pdcch) were successfully decoded. A terminal may use an additional resource area of an uplink feedback channel or may use an empty resource area of the uplink feedback channel to which feedback information of a data packet corresponding to a physical downlink control channel (pdcch) is not allocated, to perform feedback..
| Systems, apparatus and methods for facilitating frequency reuse for downlink control channels|
Systems and methods for frequency reuse on downlink control channels (dlccs) are provided. One method can include determining a first number of symbols to support transmission of control information on a dlcc, and configuring a second number of symbols for transmission of the control information on the dlcc, wherein the second number of symbols is greater than the first number of symbols.
| Method and apparatus for transmitting channel quality control information in wireless access system|
Methods and devices for transmitting or receiving channel quality control information through a physical uplink shared channel (pusch) in a wireless access system that supports hybrid automatic retransmit request (harq) are discussed. The method in one embodiment performed by a user equipment (ue) includes receiving a physical downlink control channel (pdcch) signal including an initial uplink grant, transmitting uplink data using two transport blocks based on the initial uplink grant, receiving a negative acknowledgement (nack) information for one of the two transport blocks, and transmitting a channel quality control information along with the one of the two transport blocks which is retransmitted according to the nack information or a new transport block through the pusch to which the harq is applied.
| Method and apparatus for channel state information measurement in a wireless communication system|
Methods and apparatuses are disclosed to measure channel state information in a wireless communication system. The method includes selecting a subframe to be a reference resource for a channel state information (csi) report on a secondary cell (scell), in which the subframe is not a downlink (dl) subframe or a special subframe whose downlink portion is longer than a threshold on a primary cell (pcell).
| Method and apparatus for improving a new carrier type in a wireless communication system|
Methods and apparatuses are disclosed to improve a new carrier type in a wireless communication system. The method includes having, in at least one subframe, more than one number of available resource elements among physical resource blocks (prbs) in a cell.
| Method and terminal of transmitting an uplink signal with fewer transmission resource blocks to prevent a lowering in reference sensitivity in intra-band non-contiguous uplink carrier aggregation|
There is provided a method of transmitting an uplink for reference sensitivity test for intra-band non-contiguous ca in lte-a system. The method may comprise: if a carrier aggregation (ca) is configured, if the configured ca corresponds to an intra-band ca, and if the configured ca corresponds to non-contiguous ca, transmitting an uplink on a primary component carrier using allocated resource blocks (rbs).
| Exploiting hybrid-channel information for downlink multi-user scheduling|
A method for determining an optimal network utilization maximization in a communication system with wireless links in which current and coarse channel state information csi is available from all users, along with a limited amount of fine csi by way of a frame based entails a scheduling and feedback under which a virtual queue is associated with each user with virtual rates being determined at start of each frame and policy of each frame being determined by solving a decision process.. .
| Method of reducing reference signals and communication device thereof|
A method of reducing a number of reference signals for a communication device in a wireless communication system, includes receiving a downlink control information (dci) message in a first bundling subframe of a plurality of bundling subframes, wherein the bundling subframes are contiguous subframes; receiving reference signals with a reduced pattern in the plurality of bundling subframes, wherein a number of the reference signals with the reduced pattern is smaller than a number of the reference signals determined in corresponding specifications; measuring channel responses according to the reference signals with the reduced pattern; using the channel responses to perform channel interpolations in the plurality of bundling subframes, for acquiring channel estimations of the plurality of the bundling subframes; and receiving data according to the dci message in the plurality of bundling subframes.. .
| Signaling transmitting method, user equipment, and base station|
The present invention provides a signaling transmitting method, a user equipment and a base station. In the present invention, a first dpcch is transmitted to a base station over an uplink main carrier, where information borne over the first dpcch at least includes: first pilot information, downlink tpc information, and the downlink tpc is at least used for the base station to perform power control on a downlink main carrier; and a second dpcch is transmitted to the base station over an uplink secondary carrier, where the second dpcch is used to bear uplink signaling, and the uplink signaling is second pilot information, or, the uplink signaling is the second pilot information and tfci information, or, the uplink signaling is the second pilot information and fbi information, or, the uplink signaling is the second pilot information, the tfci information and the fbi information..
| Efficient uplink resource indication for csi feedback|
Channel state information (csi) feedback reporting is disclosed for multi-cell downlink cooperation networks. In such networks, when a user equipment (ue) has little uplink data traffic, csi feedback is triggered by the serving base station through a downlink grant to the ue.
| Methods, systems and apparatus for defining and using phich resources for carrier aggregation|
Systems, methods, and instrumentalities are disclosed to provide feedback to a user equipment (ue). A ue may transmit uplink data via a supplementary cell.
| Wireless communication system using distributed antennas and method for performing the same|
Provided are a wireless communication system and method using distributed antennas. A physical channel and reference signal (rs) transmission/reception method for downlink and uplink communication using a plurality of points is provided for a case in which the plurality of points have different physical cell identities (pcis), or in a wireless communication environment using distributed antennas in which the plurality of points belong to the same cell and have the same pci.
| Enhanced control channel element (ecce) based physical downlink shared channel (pdsch) resource allocation for long-term evolution (lte)|
Aspects of the present disclosure provide techniques and apparatus for enhanced control channel element (ecce) based physical downlink shared channel (pdsch) resource allocation for long-term evolution (lte). A method is provided for wireless communications by a user equipment (ue).
| Pdcch resource utilization|
The present disclosure provides coordination of assignments for the physical downlink control channel (pdcch) in a multi-sector cell based on reuse of cce resources to user equipment (ue) in different sectors that are well isolated from each other. For non-isolated ues the cce resources are either repeated in all sectors for better reception performance, or transmitted in one sector whilst the corresponding cces in the other sectors are reserved.
| Access point and method for aggregate mpdu (a-mpdu) and power-save multi-poll (psmp) operation|
Embodiments of wireless devices and methods for aggregate mpdu (a-mpdu) communications in an ieee 802.11n network are generally described herein. Two or more a-mpdu subframes are aggregated to form an a-mpdu.
| Method and apparatus for transceiving signals|
The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and to an apparatus for the method, wherein the method is configured such that a base station, in which cross-carrier scheduling through a first component carrier (cc) is set, transmits a downlink signal in a tdd wireless communication system in which the first cc and a second cc are aggregated, wherein the method comprises a step of transmitting a control channel signal during a specific subframe timing during which the second cc is set as a downlink.
| Method and device for indicating control channel|
Disclosed are a method and device for indicating a control channel. The method for indicating a control channel includes: channelization processing is performed on indication information indicating the control channel, wherein the control channel is a newly added control channel area or a control channel on a resource which is newly carved out of resources reserved for pdsch and is for transmitting control information; and the processed indication information is sent to ue.
| Method for feeding back different uplink-downlink configuration ratios for lte-a tdd|
Provided is a method for feeding back different uplink-downlink configuration ratios for lte-a tdd. For an asymmetric uplink and downlink sub-frame in a carrier aggregation scenario, the uplink sub-frame of each component carrier only feeds back ack/nack of the downlink sub-frame pdsch of the current carrier, not feeding back ack/nack of other carriers.
| Aro values in pucch resource allocation for epdcch in tdd|
Methods, apparatuses, and computer program products for defining aro values in tdd are provided. One method includes defining acknowledgement (ack)/negative acknowledgement (nack) resource offset (aro) values in time division duplex (tdd) with a first set of values and a second set of values.
| Method and apparatus for performing uplink/downlink transmission in a flexible subframe|
A method and apparatus for performing uplink/downlink (ul/dl) transmission in a flexible subframe are provided. The method includes receiving downlink transmission configuration information in a flexible subframe that is different from configuration information of a subframe that has a fixed duplexing direction; detecting downlink control information transmitted by a base station in the flexible subframe; receiving downlink data corresponding to the downlink control information; and reporting hybrid automatic repeat request acknowledgment (harq-ack) for the downlink data and downlink channel state indication (csi) information to the base station..
| Method for downlink jammer detection and avoidance in long-term evolution (lte) networks|
A method for handling a jamming signal in a wireless network includes obtaining network measurement data on a wireless network performance, the network measurement data collected by a wireless network element. A first performance information on the wireless network performance is derived based on the network measurement data obtained.
|Interference processing method and device|
Embodiments of the present invention provide an interference processing method and device. A user equipment receives a notification message sent by a network side.
|Mobile station apparatus, control apparatus, base station apparatus, method implemented therein, and computer readable medium|
A mobile station apparatus (400) is configured to receive a broadcast message broadcasted from a radio communication network (10) in a downlink physical channel to be received by a plurality of mobile stations in a standby state (e.g., rrc_idle state, cell_pch state, or ura_pch state). Further, the mobile station (400) is configured to send a confirmation response indicating a reception status of the broadcast message to the radio communication network (10) while remaining in the standby state without changing to a communication state (e.g., rrc_connected state or cell_dch state) in which user data can be transmitted and received.
|Hybrid interference alignment for mixed macro-femto base station downlink|
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus is a first bs.
|Operation of a heterogeneous wireless network by determining location of a wireless device|
A heterogeneous wireless communication network includes a macrocell base station that one or more low power nodes. The location of a wireless device is estimated based on feedback reports received from the wireless device in response to downlink transmissions of a reference signal.
|Handling uplink power limited scenarios|
A method for reducing power consumption by a wireless communication device is disclosed. The method can include the wireless communication device determining that the device is experiencing an uplink power limited condition.
|System and methods for mitigating receiver desense caused by simultaneous transmission on multi-sim wireless communications devices|
Methods are provided that enable mitigation of desense from a transmission on a first radio frequency (rf) resource associated with a first sim to a receiver circuit of a second rf resource associated with a second sim in the same device. A multi-sim wireless device, such as a dual-sim dual active (dsda) device, may utilize characteristics of uplink and downlink signals to determine an optimal action that reduces interference from conflicting signals.
|Method, controller, and system for tunnel communication|
A communication system for allowing personnel in a tunnel below ground to communicate with a location above ground includes a controller disposed below ground in the tunnel. The system includes an uplink portion that sends uplink messages from the controller below ground in the tunnel through earth to above ground.
|Method and apparatus for transmitting downlink reference signal in wireless communication system that supports multiple antennas|
The present invention relates to a wireless communication system, and in particular, to a method and an apparatus for transmitting a downlink reference signal in a wireless communication system that supports multiple antennas. The method for transmitting a reference signal for a maximum of eight antenna ports according to one embodiment of the present invention comprises: in a base station, mapping part of a common reference signal for a maximum of four antenna ports into a downlink subframe that includes a 1st slot and a 2nd slot; in the base station, mapping a channel status information reference signal for the maximum of eight antenna ports into the downlink subframe, according to a preset pattern; and in the base station, transmitting the downlink subframe into which the common reference signal and the channel status information reference signal have been mapped, wherein the preset pattern defines the channel status information reference signal for the maximum of eight antenna ports to be mapped onto two ofdm symbols of the data region in the downlink subframe, and wherein part of the common reference signal for the maximum of four antenna ports is limited to the common reference signal for a maximum of two antenna ports..
|Method and apparatus for generating and processing mac-ehs protocol data units|
A network device and wireless transmit/receive unit (wtru) using an enhanced high speed medium access control (mac-ehs) are disclosed. A network device may provide a mac-ehs reordering protocol data unit (pdu) with a segment of a service data unit (sdu).
|Synchronization signal design for wireless devices in a long range extension mode|
Systems and methods related to a synchronization signal particularly well suited for wireless devices in an extended coverage area of a cell of a cellular communications network are disclosed. In one embodiment, a base station transmits a synchronization signal including multiple repetitions of a basic synchronization block during a coherence time of a downlink channel over which the synchronization signal is transmitted.
|Reuse of rf receive chain for hand-in assistance|
A radio frequency receive chain of an access point is reused for different functions. For example, the same rf receive chain may be used to receive on a downlink at certain points in time and on an uplink at other points in time.
|Mobile telecommunications architecture|
A mobile telecommunications architecture is disclosed. A downlink mobile telecommunications signaling message is received via a first communication interface associated with a single shared network controller connection to a mobile switching center (msc) server.
|Method of handling communication operations and related communication device|
A method of handling a communication operation for a communication device configured with a first cell comprises the steps of performing a first communication operation in a subframe via the first cell, if a direction of the subframe determined according to a uplink (ul)/downlink (dl) configuration of the first cell and a direction of the subframe determined according to a reference ul/dl configuration are the same; and stopping the first communication operation in the subframe via the first cell, if the direction of the subframe determined according to the ul/dl configuration of the first cell and the direction of the subframe determined according to the reference ul/dl configuration are the different.. .
|Method and apparatus for performing random access in wireless communication system|
Provided are a method and an apparatus for performing random access in a wireless communication system. A terminal receives from a base station a physical downlink control channel (pdcch) indication, which indicates an initiation of the random access with respect to a secondary cell (scell), based on whether a cross-carrier scheduling is supported by the scell; transmits a physical random access channel (prach) preamble to the base station through the scell; and transmits a rach response as a response to the prach preamble, based on whether the scell supports the cross-carrier scheduling, wherein the scell and a primary cell (pcell) comprises a carrier aggregation (ca) system, the pcell is a cell from which the terminal performs radio resource control (rrc) connection with the base station, and wherein the scell is at least one cell from residual cells in the carrier aggregation excluding the pcell..
|Communication system, base station apparatus, mobile station apparatus, and communication method|
Provided are a communication system, a base station apparatus, a mobile station apparatus, and a communication method for reducing interference between uncoordinated adjacent cells. The communication system of the present invention comprises a base station apparatus and a mobile station apparatus.
|Method and apparatus for data-splitting transmission from multiple sites|
Methods and apparatus for changing cell range coverage are disclosed. The coverage may be changed on a per-sub-frame basis.
|Overhead reduction for transmission of acknowledgment signals|
A method and apparatus for compressing resources used for transmitting acknowledgment signals from user equipments (ues). An acknowledgment signal is in response to detections from a ue of one or more physical downlink control channels (pdcchs) in respective one or more transmission time interval (ttis) within m ttis.
|Apparatus and method for a communication system|
Apparatus and method for communication are provided. The solution includes controlling the communication of a transceiver on shared data channels using a data channel slot including a sensing period and a data period and controlling a transceiver to communicate on common and dedicated control channels on a shared spectrum using control channel slots, each control channel slot including a downlink part and an uplink part, wherein the uplink part occurs at the same time as the sensing period of a data channel slot..
|Systems and methods for dynamically configuring a flexible subframe|
A user equipment (ue) for dynamically configuring a flexible subframe is described. The ue includes a processor and instructions stored in memory that is in electronic communication with the processor.
|Controlling random access failure on a secondary cell|
A method in a base station for controlling a random access, ra, procedure is provided. The base station initiates (201) an ra procedure on a secondary cell, scell, in a user equipment, ue, by sending to the ue a physical downlink control channel, pdcch, order for a ra procedure on the scell.
|Antenna port management for localized enhanced physical downlink control channel transmissions|
Methods, systems, and devices are described for managing wireless communications. A first decoding candidate and a second decoding candidate are identified from a plurality of decoding candidates for a localized enhanced physical downlink control channel (epdcch) transmission.
|Apparatus and method for discontinuous receive in communication systems with large number of antennas|
A user equipment (ue) performs a method for supporting discontinuous receive (drx) in a wireless network. The method includes waking up at a wake up time associated with a beginning of a drx cycle, the drx cycle comprising a plurality of subframes.
|Method of remapping hybrid automatic repeat request timeline in time division duplex uplink-downlink reconfiguration|
A method of remapping hybrid automatic repeat request (harq) timeline in time division duplex (tdd) uplink-downlink (ul-dl) reconfiguration, for a communication device in a wireless communication system is disclosed. The method includes being reconfigured from a first tdd ul-dl configuration in a first radio frame to a second tdd ul-dl configuration in a second radio frame, determining a tdd ul-dl reference configuration according to ul subframe allocations of the first and second tdd ul-dl configurations in the first radio frame, and performing harq processes of the first tdd ul-dl configuration according to a harq timeline of the tdd ul-dl reference configuration during the first and second radio frames..
|Method and apparatus for performing effective feedback in wireless communication system supporting multiple antennas|
A method for transmitting channel status information (csi) of downlink multi-carrier transmission includes generating the csi including at least one of a rank indicator (ri), a first precoding matrix index (pmi), a second pmi and a channel quality indicator (cqi) for one or more downlink carriers, the cqi being calculated based on precoding information determined by a combination of the first and second pmis, determining, when two or more csis collide with one another in one uplink subframe of one uplink carrier, a csi to be transmitted on the basis of priority, and transmitting the determined csi over a uplink channel. If a csi including an ri or a wideband first pmi collides with a csi including a wideband cqi or a subband cqi, the csi including a wideband cqi or a subband cqi has low priority and is dropped..
|Methods of radio communications using different subframe configurations and related radio and/or network nodes|
A method may be provided in a radio node capable of operating in a radio access network according to at least first and second uplink/downlink subframe configurations that are different. The first uplink/downlink subframe configuration and the second uplink/downlink subframe configuration may be used for operation in a first cell and a second cell respectively, and/or the first uplink/downlink subframe configuration and the second uplink/downlink subframe configuration may be used in the first cell or the second cell at non-overlapping times.
|Channel state information-reference signal patterns for time division duplex systems in long term evolution wireless networks|
A user equipment (ue) for time division duplex (tdd) communication through a wireless communication channel has a receiver to receive a channel state information reference signal (csi-rs) subframe configuration value, a csi-rs configuration value, and a csi-rs; and circuitry to determine a subframe index corresponding to a temporal position of a special subframe including the csi-rs; determine a csi-rs pattern of one or more orthogonal frequency division modulation (ofdm) resource elements carrying the csi-rs, the pattern being from among a group of csi-rs patterns that include of dm resource elements in ofdm symbols corresponding to a physical downlink control channel (pdcch) region of a legacy lte wireless communication channel; control the receiver to receive the special subframe carrying the csi-rs during the temporal position and at the one or more ofdm resource elements of the csi-rs pattern; and measure the wireless communication channel based on the csi-rs.. .
|System and method for discontinuous reception control start time|
Methods of combining semi-persistent resource allocation and dynamic resource allocation are provided. Packets, such as voip packets, are transmitted on the uplink and downlink using respective semi-persistent resources.
|Methods and system for resource management in tti (transmission time interval) bundling for improved phase continuity|
Certain aspects of the present disclosure propose methods for improving phase continuity in an uplink transmit time interval (tti) bundle. A first method may include identifying a segment of ul subframes in the tti bundle and maintaining substantially the same transmit power/timing/frequency when transmitting data to a node over the segment of ul subframes in the tti bundle.
|Channel traffic congestion avoidance in a mobile communication system|
A mobile station detects whether there is congestion in a cell by monitoring a first channel fix downlink messages and decoding the messages to see if the decoded messages indicate congestion, where the first channel is a common control channel (ccch). For the case in which the mobile station determines from the decoded messages that there is no congestion, the mobile station initiates a random access procedure by transmitting a request message uplink on a random access channel (rach).