KR101728118B1 - Method and apparatus for handling uplink transmission in a wireless communication system - Google Patents

Abstract

Methods and apparatus for processing uplink transmissions in a wireless communication system are disclosed. In one method, a user equipment (UE) connects to at least two base stations including a first base station controlling a first serving cell and a second base station controlling a second serving cell. The method further comprises the UE receiving downlink signaling in the second serving cell. The method also includes the UE transmitting a reference signal in the first serving cell in response to the downlink signaling.

Description

[0001] The present invention relates to a method and apparatus for handling uplink transmission in a wireless communication system,

Cross-reference to related application

This application claims priority from U.S. Provisional Patent Application No. 62 / 107,834, filed January 26, 2015, and U.S. Provisional Patent Application No. 62 / 183,439, filed June 23, 2015. The entirety of the above-mentioned patent applications are incorporated herein by reference.

Technical field

The present invention relates generally to wireless communication networks, and more particularly, to a method and apparatus for processing uplink transmissions in a wireless communication system.

BACKGROUND OF THE INVENTION With the rapid increase in demand for large amounts of data communication to and from mobile communication devices, existing mobile voice communication networks are evolving into networks that communicate with Internet Protocol (IP) data packets . Such IP data packet communications may provide voice, multimedia, multicast and on-demand communication services using IP to users of mobile communication devices.

An exemplary network structure that is currently being standardized is Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The E-UTRAN system provides high data throughput and can realize voice and multimedia services using the IP. The standardization work of the E-UTRAN system is currently performed by the 3GPP standards body. Accordingly, changes to the existing 3GPP body are currently being proposed and considered in order to evolve and complete the 3GPP standard.

Methods and apparatus for processing uplink transmissions in a wireless communication system are disclosed. In one method, a user equipment (UE) connects to at least two base stations including a first base station controlling a first serving cell and a second base station controlling a second serving cell. The method further comprises the UE receiving downlink signaling in the second serving cell. The method also includes the UE transmitting a reference signal in the first serving cell in response to receiving the downlink signaling.

1 is a diagram illustrating a wireless communication system according to one exemplary embodiment.
2 is a block diagram illustrating a transmitter system (also known as an access network) and a receiver system (also known as a user equipment or UE) according to one exemplary embodiment.
3 is a functional block diagram illustrating a communication system in accordance with an exemplary embodiment.
4 is a functional block diagram illustrating the program code of FIG. 3 in accordance with an exemplary embodiment.
5 is a flow diagram according to one exemplary embodiment.
6 is a flow diagram according to one exemplary embodiment.
7 is a flow chart according to another exemplary embodiment.
8 is a flow chart according to another exemplary embodiment.
9 is a diagram illustrating a signaling flow according to one exemplary embodiment.
10 is a diagram illustrating a signaling flow according to one exemplary embodiment.
11 is a diagram illustrating a signaling flow according to one exemplary embodiment.

The exemplary wireless communication systems and devices described below support a broadcast service using a wireless communication system. Wireless communication systems are widely used to provide various types of communication, such as voice, data, and so on. Such systems may include code division multiple access (CDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), 3GPP Long Term Evolution (LTE) Wireless access, 3GPP LTE-A or LTE-Advanced (Long Term Evolution Advanced), 3GPP2 Ultra Mobile Broadband (UMB), WiMax or other modulation schemes.

In particular, the exemplary wireless communication systems and devices described below may be designed according to the wireless technology discussed in various documents of the DOCCMO 5G white paper, NTT DoCoMo (2014.07). In addition, the exemplary wireless communication systems and devices described below may be designed to support one or more standards, such as standards proposed by a consortium named " 3rd Generation Partnership Project " herein referred to as 3GPP. Such standards are: 3GPP R2-145410, "Introduction of Dual Connectivity "; 3GPP TS 36.321 V12.3.0, "E-UTRA MAC protocol specification "; 3GPP TS 36.331 V12.3.0, "E-UTRA RRC protocol specification "; And 3GPP TS 36.300 V12.3.0, "E-UTRA and E-UTRAN Overall description ". The standards and documents listed above are hereby incorporated by reference in their entirety.

1 illustrates a multiple access wireless communication system in accordance with an embodiment of the present invention. An access network (AN) 100 includes multiple antenna groups, one group containing reference numerals 104 and 106, another group including reference numerals 108 and 110, and reference numerals 112 and 114 Lt; / RTI > In FIG. 1, only two antennas are shown for each antenna group, but in practice more or less antennas may be used for each antenna group. An access terminal (AT) 116 is in communication with antennas 112 and 114 where the antennas 112 and 114 are connected to the access terminal 116 via a forward link 120, And receives information from the access terminal 116 on the reverse link of reference numeral 118. An access terminal (AT) 122 is in communication with the antennas 106 106 and 108, where the antennas 106 108 communicate with the access terminal (AT) 122 via a forward link 126, And receives information from the access terminal (AT) 122 on the reverse link of reference numeral 124. In an FDD system, the communication links 118, 120, 124, and 126 may use different frequencies for communication. For example, the forward link at 120 may use a different frequency than that used by the reverse link at 119.

Each antenna group and / or a region designed to communicate with them is often referred to as a sector of the access network. In this embodiment, each antenna group is designed to communicate with access terminals in the sectors of the areas covered by the access network 100.

In communications on the forward links 120 and 126, the transmit antennas of the access network 100 are beamformed to improve the signal-to-noise ratio of the forward links to the different access terminals 116 and 122, a beamforming technique can be used. In addition, an access network using beamforming to transmit to access terminals that are randomly scattered within its coverage may be used for access terminals in neighboring cells, as compared to an access network that transmits to all access terminals via one antenna, Lt; RTI ID = 0.0 > interference. ≪ / RTI >

An access network (AN) may be a base station or a fixed station used for communicating with terminals and may also be referred to as an access point, a Node B, a base station, an enhancement base station, an evolved Node B (eNB) The access terminal (AT) may also be referred to as a user equipment (UE), a wireless communication device, a terminal, an access terminal or some other terminology.

2 is a block diagram of an embodiment of a transmitter system 210 (also referred to as an access network) and a receiver system 250 (also referred to as an access terminal (AT) or a user terminal (UE)) of a Multiple Input Multiple Output (MIMO) It is a simplified block diagram. At the transmitter system 210, traffic data for a plurality of data streams is provided from a data source 212 to a transmit (TX) data processor 214.

In one embodiment, each data stream is transmitted on a respective transmit antenna. The TX data processor 214 formats, codes, and interleaves traffic data for each data stream based on a particular coding scheme selected for the data stream to provide coded data .

The coded data for each data stream may be multiplexed with the pilot data using OFDM techniques. The pilot data is a known data pattern that is typically processed in a known manner and can be used in the receiver system to predict the channel response. The coded data for each data stream and the multiplexed pilot are then modulated (i.e., modulated) based on a particular modulation scheme (e.g., BPSK, QPSK, M-PSK or M-QAM) , Symbol mapped) to provide modulation symbols. The data rate, coding, and modulation for each data stream may be determined by instructions that are executed by the processor 230.

The modulation symbols for all subsequent data streams are then provided to a TX MIMO processor 220, which may further process the modulation symbols (e.g., for OFDM). The TX MIMO processor 220 then provides the N _T modulation symbol streams to the N _T transmitters (TMTR) 222a through 222t. In certain embodiments, the TX MIMO processor 220 applies beamforming weights to the symbols of the data streams and the antenna on which the symbols are transmitted.

Each transmitter 222 receives and processes a respective symbol stream to provide one or more analog signals and further conditioning (e.g., amplifying, filtering and upconverting upconverting) to provide a modulated signal suitable for transmission over the MIMO channel. N _T modulated signals from transmitters 222a through 222t are then transmitted from N _T antennas 224a through 224t, respectively.

In the receiver system 250, the transmitted modulated signals are N _R The signals received by the antennas 252a through 252r and received from each antenna 252 are provided to respective receivers (RCVR) 254a through 254r. Each receiver 254 performs an adjustment process (e.g., filtering, amplifying and downconverting) each received signal, digitizes the adjusted signal to provide samples, To provide a corresponding " received " symbol stream.

The RX data processor 260 then sends an N _R N receivers 254 to N _R Received symbol streams and processes them based on a particular receiver processing technique to provide N _T " detected " symbol streams. The RX data processor 260 then demodulates, deinterleaves, and decodes each detected symbol stream to recover the traffic data for that data stream. The processing by RX data processor 260 is complementary to the processing performed by TX MIMO processor 220 and TX data processor 214 of transmitter system 210.

The processor of reference numeral 270 periodically determines which pre-coding matrix to use (this will be described in greater detail below). The processor 270 generates a reverse link message including a matrix index portion and a rank value portion.

The reverse link message may include various types of information for the communication link and / or the received data stream. The reverse link message is then processed by a TX data processor 238 that receives traffic data for a number of data streams from a data source 236, modulated by a modulator 280, and transmitted by transmitters 254a- 254r and transmitted back to the transmitter system 210. [

In the transmitter system 210, the modulation signals from the receiver system 250 are received by an antenna 224, conditioned by receivers 222, demodulated by a demodulator 240, And processed by the data processor 242 to extract the reverse link message transmitted by the receiver system 250. The processor 230 then determines which pre-coding matrix to use to determine the beamforming weights and then processes the extracted message.

3, which is an alternative simplified functional block diagram of a communication device in accordance with an embodiment of the present invention. 3, the communication device 300 of the wireless communication system may be used to implement the UEs (or ATs) 116, 122 of FIG. 1 or the base station (or AN) of FIG. 1, Preferably, the wireless communication system is an LTE system. The communication device 300 includes an input device 302, an output device 304, a control circuit 306, a central processing unit (CPU) 308, a memory 310, a program code 312 and a transceiver. (314). The control circuit 306 executes the program code 312 in the memory 310 via the CPU 308 to control the operation of the communication device 300. [ The communication device 300 may receive a user input signal through the input device 302, such as a keyboard or a keypad, and may output an image and sound through the output device 304, such as a monitor or speakers can do. The transceiver 314 is used to receive and transmit a radio signal, deliver the received signals to the control circuit 306, and wirelessly output the signals generated by the control circuit 306. The communication device 300 of the wireless communication system may also be used to implement the AN 100 of FIG.

FIG. 4 is a simplified block diagram of the program code 312 shown in FIG. 3, in accordance with an embodiment of the invention. In this embodiment, the program code 312 includes an application layer 400, a layer 3 portion 402, and a layer 2 portion 404, which are coupled to a layer 1 portion 406. The layer 3 portion 402 generally performs radio resource control. The layer 2 portion 404 typically performs link control. The layer 1 portion typically performs physical connections.

For an LTE or LTE-A system, the layer 2 portion 404 may include a Radio Link Control (RLC) layer and a Medium Access Control (MAC) layer. The layer 3 portion 402 may include a radio resource control (RRC) layer.

The concept of wireless access to 5G is mentioned in the DOCOMO 5G White Paper. One point mentioned in this document is the efficient integration of the lower and higher frequency bands. Higher frequency bands provide opportunities for a wider spectrum, but they have coverage limits due to higher path loss. Thus, in the DOCOMO 5G White Paper, a 5G system may be implemented with a coverage layer (e.g. comprising a macro cell (s)) and a coverage layer (e.g. with a small cell (s) or phantom cell Layer structure consisting of a capacity layer consisting of a plurality of layers. The coverage layer uses the existing lower frequency band to provide basic coverage and mobility. In addition, the capacity layer uses a new higher frequency band to provide high data rate transmission. The coverage layer may be supported by enhanced LTE (Long Term Evolution Radio Access Technology) and the capacity layer may be supported by a new RAT for higher frequency bands. The efficient integration of the coverage layer and the capacity layer is enabled by close interworking (double connection) between the enhanced LTE RAT and the new RAT.

The dual connectivity disclosed in 3GPP R2-145410 includes a master eNB (eNB) including a master cell group (i.e., a Primary Cell (PCell) and optionally one or more secondary cells (I.e., a group of serving cells associated with a secondary eNB (SeNB), including a secondary cell group (i.e., primary SCell (PSCell) and optionally one or more SCell) , The operating mode of the user terminal (UE) of RRC_CONNECTED. A UE configured with a dual connection uses radio resources provided by two distinct schedulers located within two eNBs (e.g., MeNB and SeNB) that are connected via a non-ideal backhaul through the X2 interface ≪ / RTI > Other details of the dual connection are disclosed in 3GPP R2-145410.

In order to maintain uplink time alignment within the serving cell or serving cell group, the Timing Advance Command (in the MAC Control Element or Random Access Response message) and the timeAlgnmentTimer are defined in 3GPP TS 36.321 V12 It is used in LTE as described in .3.0.

5.2 Maintenance of Uplink Time Alignment

The UE may configure the configurable timer timeAlignmentTimer For each TAG. The timeAlignmentTimer is used to control the period during which the UE considers serving cells belonging to the associated TAG to be uplink time synchronized [8].

The UE comprising:

- Timing Advance Command When a MAC control element is received:

- apply the timing advance command for the indicated TAG;

- to start or restart the timeAlignmentTimer associated with the displayed TAG.

When the timing advance command is received in the random access response message for the serving cell belonging to the TAG:

If the random access preamble is not selected by the UE MAC:

- apply the timing advance command for this TAG;

- to start or restart the timeAlignmentTimer associated with the TAG.

- Otherwise, the timeAlignmentTimer associated with this TAG If not running:

- apply the timing advance command for this TAG;

- it will begin timeAlignmentTimer associated with the TAG;

- When the contention resolution is not considered successful as described in subclause 5.1.5, the timeAlignmentTimer associated with this TAG .

- otherwise :

- ignore the received timing advance command.

- When timeAlignmentTimer expires:

If the timeAlignmentTimer is associated with a pTAG:

- flush all HARQ buffers for all serving cells;

- notify the RRC to release the PUCCH / SRS for all serving cells;

- clear any established downlink assignments and uplink approvals;

- all running timeAlignmentTimers Will be considered expired;

Otherwise, if the timeAlignmentTimer is associated with an sTAG, then for all serving cells belonging to this TAG:

- flush all HARQ buffers;

- Notify the RRC to release the SRS.

The timeAlignmentTimer associated with the TAG to which the serving cell belongs The UE will not perform any uplink transmissions in its serving cell, except for the random access preamble transmission. In addition, the timeAlignmentTimer associated with pTAG The UE will not perform any uplink transmissions on any serving cell except for the random access preamble transmission on the PCell.

Note: The UE shall use the associated timeAlignmentTimer N _TA is stored or maintained at the expiration of N _TA , where N _TA is defined in [7]. The UE applies a received timing advance command MAC control element, and when the timeAlignmentTimer is not executing, the associated timeAlignmentTimer Lt; / RTI >

Also, cells on the capacity layer may use beamforming. Beamforming is a signal processing technique used in antenna arrays for directional signal transmission or reception. This is accomplished by combining the elements of the phased array such that signals at certain angles cause constructive interference and other signals cause destructive interference. Beamforming can be used at both ends of the transmission and reception to achieve spatial selectivity. The improvement compared to omnidirectional reception / transmission is known as reception / transmission gain.

Beam shapes have been applied in radar systems. The beam formed by a phased array radar is relatively narrow and very agile compared to a moving dish. This feature provides the radar with the ability to detect small and fast targets as well as aircraft, as well as ballistic missiles.

In addition, the advantage of co-channel interference reduction makes beam forming an attractive option in mobile communication systems. For example, the concept of beam division multiple access (BDMA) based on beamforming techniques has been used. In BDMA, a base station can communicate with a mobile device via a narrow beam to obtain receive / transmit gains. In addition, two mobile devices in different beams can simultaneously share the same radio resources, and thus the capacity of the mobile communication system can be greatly increased. To achieve this, the base station will need to know to which beam the mobile device is located.

As previously disclosed, a cell using a higher frequency band will have a coverage limitation and is assumed to be a small cell. As a result, it is assumed that a mechanism (e.g., a timing advance command and a timeAlignmentTimer ) for maintaining the uplink time synchronization is necessary if the UE in the small cell assumes that the uplink time is always synchronized due to the small coverage of the small cell. I can not. That is, the UE need not maintain a timer associated with the small cell to determine whether the uplink time is synchronized or not. Alternatively, the value of the timer may be set to infinity.

However, the timeAlignmentTimer The UE may flush any uplink transmissions on the cell (e.g., all Hybrid Automatic Repeat Requests (HARQ) buffers for the serving serving cell (s)) due to time expiration (RRC) to release a Physical Uplink Control Channel (PUCCH) and / or a Sounding Reference Signal (SRS) to the associated serving cell (s) ). If there is no uplink (UL) traffic or downlink (DL) traffic associated with the UE, a constant transmission of uplink transmissions (e.g., a periodic SRS and a CQI ) Will cause unnecessary UE power consumption. Therefore, it should be considered to suspend any unnecessary uplink transmissions, and to resume the transmissions when necessary.

Currently, in LTE, there are several alternatives:

Alternatives analysis
De-configure the small cell as disclosed in 3GPP TS 36.331 V12.3.0, and reconfigure the deconfigured small cell if necessary
It causes a lot of signaling overhead, and it takes a long time to complete the RRC procedure. That is, the delay is increased. In particular, the SCG configuration needs to first be forwarded from the SeNB to the MeNB, which then forwards the configuration to the UE.

Deconfigure the associated RRC configuration (e.g., SRS, Channel State Indicator (CSI) configuration) as disclosed in 3GPP TS 36.331 V12.3.0 and, if necessary, reconfigure the unconfigured configuration

It causes a lot of signaling overhead, and it takes a long time to complete the RRC procedure. That is, the delay is increased.
Deactivating the small cell as described in 3GPP TS 36.321 V12.3.0, i.e. deactivating the small cell by means of a MAC control element or deactivation timer and, if necessary, activating the deactivated small cell
timeAlignmentTimer ≪ / RTI > will only disable the UL, and deactivation will disable both UL and DL. Therefore, upon arrival of UL or DL data, transmission is delayed because the cell needs to be activated first. Also, PSCell can not be disabled.

Discontinuous Reception (DRX), as disclosed in 3GPP TS 36.321 V12.3.0,
DRX can not be used to omit all UL transmissions because the SRS and CQI can still be transmitted in some TTIs (e.g., during on-duration or active time).

Reset the MAC as disclosed in 3GPP TS 36.321 V12.3.0 and, if necessary, reconfigure the associated RRC configuration (e.g., SRS, CSI configuration)
The MAC entity will be reset to its initial state. That is, all timers are stopped, the configuration is released, and all procedures in progress are interrupted. This is an overreaction. Also, the resumption of transmission is delayed due to the RRC procedure.

As disclosed, none of the presently existing alternatives is a good alternative to the timeAlignmentTimer . Thus, in a dual frequency band system, there is a need to stop unnecessary uplink transmissions and resume the transmissions when necessary.

Stopping and resuming some specific UL transmissions in a serving cell may be indicated by signaling from the base station (e.g., Physical Downlink Control Channel (PDCCH) signaling or MAC (Medium Access Control) control element) , Or implicitly by the UE. The specific UL transmission includes at least one of the following signaling: a periodic reference signal (e.g., SRS (defined in 3GPP TS 36.321 V12.3.0); A cyclic channel status report (CSI) (e.g., a CQI report (defined in 3GPP TS 36.321 V12.3.0); And / or semi-persistent uplink transmission (e.g., using uplink acknowledgments configured (as defined in 3GPP TS 36.321 V12.3.0)).

More specifically, when the UE stops transmitting the particular UL, the (RRC) configuration associated with the particular UL transmission is not released. And when the specific UL transmission is not interrupted, the UE does not stop at least one of the following signaling: a scheduling request (SR) (defined in 3GPP TS 36.321 V12.3.0); And / or a random access preamble (defined in 3GPP TS 36.321 V12.3.0).

For an implicit stop, a timer associated with a cell maintained by the UE may be used to determine whether the particular UL transmission should be performed in the cell. In one embodiment, when the timer expires, the UE stops transmitting the particular UL in the cell. Alternatively, the UE does not perform the specific UL transmission in the cell at least if the timer is not running. The timer may start (or restart) upon the occurrence of one or more of the following conditions: a drx-InactivityTimer associated with the cell (defined in 3GPP TS 36.321 V12.3.0) starts; The drx-InactivityTimer (defined in 3GPP TS 36.321 V12.3.0) associated with the cell expires; And (as defined in 3GPP TS 36.321 V12.3.0) associated with the cell drxShortCycleTimer begins; And (as defined in 3GPP TS 36.321 V12.3.0) associated with the cell drxShortCycleTimer expires; The UE receives a DRX command MAC control element (as defined in 3GPP TS 36.321 V12.3.0); The UE receives a downlink transmission in the cell; The UE receives a downlink transmission associated with the cell; The UE receives an uplink grant in the cell; And / or the UE receives an uplink grant associated with the cell.

Alternatively, this timer may be drx-InactivityTimer or drxShortCycleTimer .

For implicit resumption, the UE may resume the specific UL transmission upon occurrence of at least one of the following conditions: the UE receives a downlink transmission in the cell; The UE receives a downlink transmission associated with the cell; The UE receives an uplink grant in the cell; The UE receives an uplink grant associated with the cell; The UE triggers a scheduling request (as defined in 3GPP TS 36.321 V12.3.0); And / or the UE detects that the beam set of the cell for the UE has changed.

For explicit restart, if a serving cell in the capacity layer uses beamforming, a first base station (e.g., SeNB) controlling the serving cell (e.g., SCell or PSCell) It will not be able to identify the direction to reach the UE after one cycle time without transmission. As a result, the first base station does not know which beam will send the signaling to request the UE to resume the particular UL transmission. The explicit restart thus requires assistance from a second base station, for example MeNB, which controls another serving cell in the coverage layer. The second base station may send a DL signaling such as a PDCCH signaling or a MAC control element to request the UE to perform at least one of the following operations: resume the specific UL transmission in the serving cell action; Initiating a random access procedure in the serving cell; Transmitting a scheduling request in the serving cell; And / or transmitting an aperiodic reference signal (e.g., aperiodic SRS) in the serving cell. More particularly, the serving cell may schedule transmissions in the serving cell. For example, PDCCH signaling may be transmitted in the serving cell.

More specifically, the DL signaling may indicate a dedicated preamble to be used in the random access procedure. The DL signaling may be a PDCCH order (as defined in 3GPP TS 36.321 V12.3.0). More specifically, the second base station transmits the DL signaling due to receipt of a request from the first base station.

FIG. 5 shows a flowchart 500 from a UE perspective, in accordance with one exemplary embodiment. At step 502, the UE connects to two or more base stations, including MeNB and SeNB. In step 504, a scheduling request is transmitted in the serving cell of the SeNB regardless of the state of the timer. In step 506, downlink signaling is monitored in the serving cell regardless of the state of the timer. At step 508, when the timer is running, a specific UL transmission is transmitted in the serving cell, and when the timer is not running, the particular UL transmission is not transmitted in the serving cell.

FIG. 6 shows a flowchart 600 from the point of view of a UE, according to one exemplary embodiment. At step 602, the UE connects to two or more base stations, including MeNB and SeNB. In step 604, a scheduling request is transmitted in the serving cell of the SeNB regardless of the UE state, wherein the UE state includes at least a first state and a second state. At step 606, the downlink signaling is monitored in the serving cell regardless of the UE state. In the step of reference numeral 608, when the UE is in the first state, a specific UL transmission is transmitted in the serving cell, and when the UE is in the second state, the specific UL transmission is not transmitted in the serving cell , Wherein the UE switches from the second state to the first state when the UE has data to be transmitted in the serving cell.

FIG. 7 illustrates a flowchart 700 from a UE perspective, in accordance with one exemplary embodiment. At step 702, the UE connects to two or more base stations, including MeNB and SeNB. In step 704, a scheduling request is transmitted in the serving cell of the SeNB, regardless of the UE state, where the UE state includes at least a first state and a second state. At step 706, downlink signaling is monitored in the serving cell regardless of the UE state. In the step of reference numeral 708, when the UE is in the first state, a specific UL transmission is transmitted in the serving cell, and when the UE is in the second state, the specific UL transmission is not transmitted in the serving cell . At this time, the UE switches from the second state to the first state when one or more beams of the serving cell detected by the UE change.

FIG. 8 illustrates a flowchart 800 from a UE perspective, in accordance with one exemplary embodiment. At step 802, the UE connects to two or more base stations including a MeNB and a SeNB. At step 804, the specific UL transmission is suspended in the first serving cell of the SeNB. At step 806, downlink signaling is received at the second serving cell of the MeNB. In step 808, the particular UL transmission is resumed in the first serving cell in response to receiving the downlink signaling.

According to one exemplary method in which a UE is served by a serving cell, if the timer is not running, at least one particular uplink transmission in the serving cell is stopped. Regardless of whether the timer is running or not, a scheduling request is sent in the serving cell. At this time, the timer does not affect timing to monitor downlink signaling in the serving cell.

In another exemplary method in which the UE is served by a serving cell, due to the expiration of the timer, at least one particular uplink transmission in the serving cell is interrupted. Regardless of whether the timer has expired or has not expired, a scheduling request is sent in the serving cell, at which time the timer affects timing to monitor downlink signaling in the serving cell Do not.

In another embodiment of these exemplary methods, when the timer is running, the UE transmits the specific uplink transmission in the serving cell.

In these exemplary methods, the timer is associated with the serving cell, but the timer need not be associated with both the serving cells associated with the UE.

In these exemplary methods, the timer is started when the DRX timer associated with the serving cell starts. In other exemplary methods, the timer is re-started when the DRX timer associated with the serving cell expires. The DRX timer may be drx-InactivityTimer or drxShortCycleTimer .

In another method, the timer is started when the downlink signaling is received in the serving cell. In another method, the timer is re-started when the downlink signaling associated with the serving cell is received.

In another method, the timer is started when a DRX command MAC control element is received in the serving cell. In another method, the timer is re-started when a DRX command MAC control element is received at the serving cell.

In one exemplary method in which the UE is served by a serving cell, the UE enters a first state. In this first state, the UE is allowed to perform at least certain uplink transmission and scheduling requests in the serving cell. When the UE changes to the second state, the UE is allowed to perform at least the scheduling request, and the UE stops the specific uplink transmission in the serving cell. When an event occurs, the UE transitions from the second state to the first state. The UE monitors the downlink signaling in the serving cell regardless of whether the UE is in the first state or in the second state.

In one method, the UE changes from the first state to the second state when the timer expires. Alternatively, the UE changes from the first state to the second state when a command is received from the network. In some embodiments, the event triggering the UE transitioning from the second state to the first state comprises: receiving the downlink signaling at the serving cell; Receiving the downlink signaling associated with the serving cell; Triggering the scheduling request; Detecting that the beam set for the UE in the serving cell has changed; And / or changing one or more of the beam (s) of the serving cell detected by the UE.

In other methods, the detection of the beam is the power of a DL reference signal that is greater than a threshold, associated with the beam received by the UE. In other methods, the transmission timing of the DL reference signal associated with the beam may be used by the UE to identify or detect the beam, i.e., to derive the beam identification. Alternatively, the transmission resource of the DL reference signal associated with the beam may be used by the UE to identify or detect the beam, i.e., to derive an identification of the beam.

In other methods, determining whether the UE is in the first state or in the second state is based on whether the timer is running or not.

In other methods, the UE needs to perform the specific uplink transmission periodically in the first state. The UE need not periodically perform the specific uplink transmission in the second state.

In another exemplary method for a UE, the method comprises: connecting to at least two base stations including a first base station controlling a serving cell and a second base station controlling another serving cell; Stopping a specific uplink transmission in the serving cell; Receiving downlink signaling in the other serving cell; And resuming the particular uplink transmission in the serving cell in response to receiving the downlink signaling.

In one exemplary method for a first base station, the method comprises: serving a UE; And sending a request to a second base station, wherein the request is for a downlink signaling to the UE to instruct the UE to resume a particular uplink transmission in a serving cell controlled by the first base station, To the second base station.

In one exemplary method for a second base station, the method comprises: providing a UE; Receiving a request from a first base station, the request requesting the second base station to send downlink signaling to the UE; And sending downlink signaling to the UE to instruct the UE to resume a specific uplink transmission in a serving cell controlled by the first base station.

In other methods for the UE, the first base station and the second base station, the downlink signaling instructs the UE to resume the specific uplink transmission in the serving cell. Additionally, in other methods, the UE is allowed to send a scheduling request in the serving cell when the particular uplink transmission in the serving cell is interrupted.

In another exemplary method, a UE is connected to at least two base stations, including a first base station controlling a serving cell and a second base station controlling another serving cell; Receive downlink signaling in the other serving cell; And transmits a reference signal in the serving cell in response to receiving the downlink signaling.

In another exemplary method, a first base station: is serving a UE; And sends the request to the second base station. At this time, in order to instruct the UE to transmit a reference signal in a serving cell controlled by the first base station, the request requests the second base station to transmit downlink signaling to the UE.

In another exemplary method, the second base station is: serving a UE; Receiving a request from a first base station, wherein the request requests the second base station to send downlink signaling to the UE; And sends downlink signaling to the UE to instruct the UE to transmit a reference signal in a serving cell controlled by the first base station.

In other methods for the UE, the first base station and the second base station, the downlink signaling instructs the UE to transmit the reference signal in the serving cell. Additionally, in other methods, the reference signal is an aperiodic reference signal. In some methods, the UE stops a specific uplink transmission in the serving cell when it receives the downlink signaling. In other methods, the UE resumes the specific uplink transmission in the serving cell in response to receiving the downlink signaling.

In various methods, the first base station is a SeNB and the second base station is a MeNB. In some methods, the serving cell is PSCell. Alternatively, the serving cell is SCell. In the various methods disclosed herein, the base station is an eNB.

In various exemplary methods, the UE maintains the (RRC) configuration of the particular uplink transmission when it stops the particular uplink transmission. In other methods, transmissions in the serving cell may be scheduled by the serving cell. For example, PDCCH signaling may be transmitted in the serving cell.

In various methods disclosed herein, the UE is coupled to a plurality of serving cells. In some embodiments, the plurality of serving cells is controlled by two or more base stations. Alternatively, the plurality of serving cells are controlled by different base stations. In some methods, the serving cell is controlled by a base station (e.g., SeNB) that does not control PCell.

In the various methods disclosed herein, the particular uplink transmission is periodically transmitted, for example, based on the configuration received from the network. In various methods disclosed herein, the specific uplink transmission includes: a reference signal; SRS; CQI reporting; A Precoding Matrix Index (PMI) report (as defined in 3GPP TS 36.321 V12.3.0); (Rank Indicator) reporting (as defined in 3GPP TS 36.321 V12.3.0); A Precoding Type Indicator (PTI) report (as defined in 3GPP TS 36.321 V12.3.0); And / or semi-persistent uplink transmission (e.g., UL Semi-Persistent Scheduling (SPS).) In the various methods disclosed herein, the particular uplink transmission may include a random access preamble .

In the various methods disclosed herein, the scheduling request is transmitted due to a Buffer Status Report (BSR) triggering (defined in 3GPP TS 36.321 V12.3.0). In other methods, the scheduling request is used to request uplink resources.

In the various methods disclosed herein, the downlink signaling indicates downlink assignment in the serving cell or uplink grant in the serving cell. Alternatively, the downlink signaling is used for a new transmission. In other methods, the uplink acknowledgment is for a new transmission.

In various methods, the downlink signaling is transmitted on the PDCCH or on a Physical Downlink Shared Channel (PDSCH). In other methods, the downlink signaling is a downlink assignment or MAC control element.

As described above, a cell using a higher frequency band will have a coverage limitation. UEs in the cell may be always uplink time synchronized due to small coverage, or current mechanisms may require that the uplink time for the UE be limited to some scenarios (e.g., as discussed in 3GPP TS 36.321 V12.3.0) timeAlignmentTimer expires) can be considered as not being synchronized. That is, UL timing advance is still be required for the UE, and may (as defined in 3GPP TS 36.321 V12.3.0) associated with the cell timeAlignmentTimer is not needed or required for the UE.

Nonetheless, some specific UL transmissions in the serving cell of the capacitor layer may need to be discontinued for UE power saving, and may be required (e.g., for DL data arrival and to be transmitted in the serving cell) It may need to be resumed later. The specific UL transmission includes at least one of the following signaling: a periodic reference signal, for example a periodic SRS (as defined in 3GPP TS 36.321 V12.3.0); Periodic channel status reporting, e.g. CQI reporting (as defined in 3GPP TS 36.321 V12.3.0); And / or a semi-persistent uplink transmission using uplink acknowledgments configured, for example (as defined in 3GPP TS 36.321 V12.3.0).

Stopping the particular UL transmission may be performed either explicitly by signaling from the base station (e.g., PDCCH signaling or MAC control element), or implicitly by the UE (e.g., controlled by a timer) can be performed implicitly. More specifically, when the UE stops transmitting the particular UL, the RRC configuration associated with the particular UL transmission is not released.

For resuming, a first base station (e.g., SeNB) that controls the serving cell may provide DL signaling (e. G., PDCCH signaling or < RTI ID = 0.0 > MAC control element) to request the UE to perform at least one of the following operations: resuming the specific UL transmission in the serving cell; Initiating a random access preamble transmission (s) (as defined in 3GPP TS 36.321 V12.3.0) in the serving cell, e.g., initiating a random access procedure; Sending a scheduling request (as defined in 3GPP TS 36.321 V12.3.0) in the serving cell; And / or transmitting an aperiodic reference signal (e.g., aperiodic SRS (as defined in 3GPP TS 36.321 V12.3.0) in the serving cell.

More specifically, the DL signaling may indicate a dedicated preamble to be used in the random access procedure. The DL signaling may be a PDCCH order (as defined in 3GPP TS 36.331 V12.3.0). More specifically, the second base station transmits the DL signaling due to receipt of a request from the first base station. Examples are shown in Figures 9 and 10.

In Fig. 9, base station 2 (906) has DL data available for transmission. The second base station 906 sends a request to the first base station 904. The first base station 904 sends a PDCCH order to the UE 902. The UE 902 then initiates a preamble transmission and sends one or more preamble transmissions to the second base station 906.

10, base station 2 1006 has DL data available for transmission. The second base station 1006 sends a request to the first base station 1004. The first base station 1004 sends a periodic reference signal or an aperiodic reference signal to the UE 1002. The UE 1002 then initiates a reference signal transmission and sends one or more reference signals to the second base station 1006.

Alternatively, the first base station may send more than two requests to request a second base station to transmit more than two DL signaling, and each DL signaling may inform the UE of at least one of the operations Is performed. An example is shown in Fig. First, base station 2 1106 may request UE 1102 to transmit a reference signal in the serving cell via base station 1 1104. The second base station 1106 may then identify the beam (s) on which the UE 1102 is located. The base station 2 1106 then sends a random access preamble transmission (s) to identify the UL timing advance (as defined in 3GPP TS 36.321 V12.3.0) for the UE 1102 To the UE 1102 via the first base station 1104.

In one exemplary method for a UE, the method comprises: connecting the UE to at least two base stations including a first base station controlling a serving cell and a second base station controlling another serving cell; Stopping transmission (s) of a first specific uplink signal in the serving cell and then receiving second downlink signaling in the other serving cell; And transmitting at least one random access preamble in the serving cell in response to receiving the second downlink signaling.

In another exemplary method, the UE transmits at least one second specific uplink signal in the serving cell in response to receiving the second downlink signaling.

In one exemplary method for a UE, the method comprises: connecting to at least two base stations comprising a first base station controlling a serving cell and a second base station controlling another serving cell; Stopping transmission (s) of a first specific uplink signal in the serving cell, and then receiving a first downlink signaling in the other serving cell; Transmitting at least one second specific uplink signal in the serving cell in response to receiving the first downlink signaling; Receiving the second downlink signaling at the another serving cell after transmitting the at least one second specific uplink signal; And transmitting at least one random access preamble in the serving cell in response to receiving the second downlink signaling.

In other exemplary methods, the UE may use a timeAlignmentTimer (S) of the first specific uplink signal due to the expiration of a timer such as < / RTI > In yet another method, the UE stops transmission (s) of the first specific uplink signal due to reception of a display from the first base station. In yet another method, the UE stops transmission (s) of the first specific uplink signal due to receipt of indication from the second base station.

In other exemplary methods, the UE initiates a random access procedure in the serving cell in response to receiving the second downlink signaling. In other methods, when the UE is transmitting at least one second specific uplink signal in the serving cell in response to receiving the first downlink signaling, the timer (e.g., timeAlignmentTimer ) Is not running.

In another exemplary method for a first base station that serves a UE, the method includes transmitting a second request to a second base station, wherein the second request is transmitted to a serving base station The UE may request the second base station to send a second downlink signaling to the UE to instruct the UE to transmit at least one random access preamble in the cell. In another method, the second downlink signaling may instruct the UE to transmit at least one second specific uplink signal in the serving cell.

In another exemplary method for a first base station serving a UE, the method comprises: transmitting a first request to a second base station, the first request comprising at least one Requesting the second base station to transmit a first downlink signaling to the UE to instruct the UE to transmit a second specific uplink signal of the second base station; Receiving the at least one second specific uplink signal; And in response to receiving the at least one second specific uplink signal from the UE, transmitting a second request to the second base station, wherein the second request includes at least one random access preamble Requesting the second base station to send a second downlink signaling to the UE to instruct the UE to transmit the second downlink signaling.

In other methods, the first base station determines the beam (s) of the serving cell in which the UE is located, based on at least reception of the random access preamble. In other methods, the first base station determines the beam (s) of the serving cell in which the UE is located, based at least on receipt of the second specific uplink signal.

In other methods, the first base station transmits the first request to the second base station based on at least the presence of data to be transmitted to the UE in the serving cell. In yet another method, the first base station transmits the second request to the second base station based on at least the presence of data to be transmitted to the UE in the serving cell.

In an exemplary method for a second base station serving a UE, the method comprises the steps of: receiving a second request from a first base station, the second request being to send a second downlink signaling to the UE, 2 requesting a base station; And transmitting the second downlink signaling to the UE in response to receiving the second request to instruct the UE to transmit at least one random access preamble in a serving cell controlled by the first base station .

In yet another method, the second downlink signaling may direct the UE to transmit at least one second specific uplink signal in the serving cell.

In an exemplary method for a second base station serving a UE, the method comprises: receiving a first request from a first base station, wherein the first request is to send a first downlink signaling to the UE, Requesting a base station; Transmitting the first downlink signaling to the UE in response to receiving the first request to instruct the UE to transmit at least one second specific uplink signal in a serving cell controlled by the first base station, ; Receiving a second request from the first base station after transmitting the first downlink signaling to the UE, wherein the second request is to notify the second base station to transmit a second downlink signaling to the UE Requesting, step; And transmitting the second downlink signaling to the UE in response to receiving the second request to instruct the UE to transmit at least one random access preamble in the serving cell.

In various exemplary methods, the second downlink signaling instructs the UE to initiate a random access procedure in the serving cell. In other exemplary methods, the UE maintains the (RRC) configuration of the first specific uplink signal when it stops transmitting (s) the first specific uplink signal.

In various exemplary methods, the first specific uplink signal is periodically transmitted, for example, based on a configuration received from the network.

In various exemplary methods, the first specific uplink signal is a reference signal, SRS, CQI reporting, PMI reporting, RI reporting, PTI reporting, or semi-persistent uplink transmission.

In various exemplary methods, the second specific uplink signal is the first specific uplink transmission, an aperiodic reference signal, or a scheduling request.

In various exemplary methods, the first downlink signaling is a PDCCH signaling, a MAC control element, or an RRC message.

In various exemplary methods, the second downlink signaling is a PDCCH signaling, a PDCCH order, a MAC control element, or an RRC message.

In various exemplary methods, the first base station is an eNB or SeNB. In various exemplary methods, the second base station is MeNB. In various exemplary methods, the serving cell is PSCell or SCell. In various exemplary methods, the other serving cell is PCell.

Referring again to Figures 3 and 4, in an embodiment of the apparatus, the apparatus 300 includes program code 312 stored in a memory 310. [ The CPU 308 may include (i) connecting a user terminal to at least two base stations including a first base station controlling a first serving cell and a second base station controlling a second serving cell, (ii) (Iii) transmitting the reference signal in the first serving cell in response to receiving the downlink signaling, and (ii) receiving the downlink signaling in the serving cell. have. In addition, the CPU 308 may execute the program code 312 to perform all of the operations and steps described above, or other operations and steps described herein.

3 and 4, in an embodiment in terms of a first base station, the first base station 300 includes a program code 312 stored in a memory 310. As shown in FIG. The CPU 308 may execute the program code 312 to perform the steps of (i) serving the UE and (ii) sending the request to the second base station, Requesting the second base station to send downlink signaling to the UE to instruct the UE to transmit a reference signal in a serving cell controlled by the first base station. In addition, the CPU 308 may execute the program code 312 to perform all of the operations and steps described above, or other operations and steps described herein.

Referring again to Figures 3 and 4, in one embodiment in terms of a second base station, the second base station 300 includes program code 312 stored in memory 310. [ The CPU 308 is configured to (i) serve a UE, (ii) receive a request from a first base station, the request requesting the second base station to send downlink signaling to the UE, step; And (iii) transmitting the downlink signaling to the UE to instruct the UE to transmit a reference signal in a serving cell controlled by the first base station. . In addition, the CPU 308 may execute the program code 312 to perform all of the operations and steps described above, or other operations and steps described herein.

Various aspects of the disclosure have been described so far. It is to be understood that the teachings herein may be embodied in many different forms and that any specific structure, function, or all of the examples disclosed herein are merely representative examples. Based on the teachings herein, one of ordinary skill in the art will appreciate that one aspect disclosed herein may be implemented independently of some other aspects, and that two or more aspects of these aspects may be combined in various ways. For example, one device may be implemented and one method implemented using any number of aspects disclosed herein. Additionally, in addition to one or more aspects of the aspects described herein, or in addition to one or more aspects of the aspects described herein, such device may be implemented using other structures, functionality, or structure and functionality, Methods may also be practiced. As an example of some of the above concepts, in some aspects, concurrent channels can be established based on pulse repetition frequencies. In some aspects, concurrent channels can be established based on pulse positions or offsets. In some aspects, concurrent channels may be established based on time hopping sequences. In some aspects, concurrent channels may be established based on pulse repetition frequencies, pulse positions or offsets, and time hopping sequences.

As will be appreciated by those skilled in the art, information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

Those skilled in the art will recognize that the various illustrative logical blocks, modules, processors, means, circuits, and algorithm steps described in connection with the aspects disclosed herein may be implemented as electronic hardware (e.g., (Which may be referred to herein as "software" or "software module"), design code integration instructions, or both It will also be appreciated that the present invention can be implemented as combinations. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the functionality described above in a variety of ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosure herein.

In addition, the various illustrative logical blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented within an integrated circuit (IC), an access terminal, or an access point, (IC), an access terminal, or an access point. The IC may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (DSP), or the like, which are designed to perform the functions described herein. ; FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, electrical components, optical components, mechanical components, or any combination thereof, Internal or external to the IC, or inside or outside the IC. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a computing device, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors associated with a DSP core, or other such configuration.

It is understood that any particular order or hierarchy of steps in any of the processes disclosed above is an exemplary approach. Based on design preferences, one of ordinary skill in the art will appreciate that the particular order or hierarchy of steps in the process may be rearranged while remaining within the scope of the present disclosure. The accompanying method claims are set forth in order of step-by-step elements and are not to be construed as limited to the specific order or hierarchy set forth in the claims.

The steps of a method or algorithm described in connection with the aspects disclosed herein may be embodied directly in hardware, directly in a software module executed by a processor, or may be embodied directly in a combination of the two. The software modules and other data (e.g., including executable instructions and related data) may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD- Or other types of computer-readable storage media known in the art. Exemplary storage media include, for example, a computer / processor (which may be referred to herein as a "processor" for convenience) that allows the processor to read information (e.g., code) from the storage medium and write information to the storage medium ). ≪ / RTI > An exemplary storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. Alternatively, the processor and the storage medium may reside as discrete components in a user terminal. Moreover, in some aspects, any suitable computer-program product may include a computer-readable medium containing code for one or more aspects of the disclosure. In some aspects, the computer program product may include packaging materials.

While the invention has been described with respect to various aspects, it will be understood that the invention is capable of further modifications. This disclosure is intended to cover any variations, uses, or adaptations of the invention, which generally follow the principles of the invention, and which are intended to cover any variations, uses, or adaptations that will occur to those skilled in the art And such departures from the disclosure of the present application.

Claims (22)

A method for processing an uplink transmission in a wireless communication system, the method comprising:
Connecting a user equipment (UE) to at least two base stations including a first base station controlling a first serving cell and a second base station controlling a second serving cell;
Periodically transmitting, by the UE, a specific uplink transmission in the first serving cell;
Discontinuing the specific uplink transmission in the first serving cell by the UE; And
In response to receiving downlink signaling in the second serving cell, transmitting an aperiodic reference signal in the first serving cell by the UE, and transmitting, in the first serving cell, And restarting the specific uplink transmission. The method according to claim 1,
And the UE holds the configuration of the specific uplink transmission when the UE stops the specific uplink transmission. The method according to claim 1,
The particular uplink transmission may be an uplink transmission, which is a periodic reference signal, a sounding reference signal (SRS), a periodic channel status report, a channel quality indicator (CQI) report, Transmission processing method. The method according to claim 1,
Wherein the UE stops the particular uplink transmission in the first serving cell when the timer is not running due to expiration of a timer or when a command is received from the network. A method for processing an uplink transmission in a wireless communication system, the method comprising:
Connecting a user equipment (UE) to at least two base stations including a first base station controlling a first serving cell and a second base station controlling a second serving cell;
Periodically transmitting, by the UE, a specific uplink transmission in the first serving cell;
Discontinuing the specific uplink transmission in the first serving cell by the UE; And
When the UE is triggering a scheduling request, or when the UE detects that the beam set of the first serving cell for the UE has changed, resuming the particular uplink transmission in the first serving cell by the UE The method comprising the steps of: The method of claim 5,
The UE comprising:
Detecting the beam based on a power of a DL reference signal received by the UE and greater than a threshold value associated with the beam or based on a transmission time or resource of the DL reference signal associated with the beam, Transmission processing method. The method of claim 5,
And the UE holds the configuration of the specific uplink transmission when the UE stops the specific uplink transmission. The method of claim 5,
The particular uplink transmission may be an uplink transmission, which is a periodic reference signal, a sounding reference signal (SRS), a periodic channel status report, a channel quality indicator (CQI) report, Transmission processing method. A method for processing an uplink transmission in a wireless communication system in which a second base station serves a user terminal (UE), the method comprising:
Receiving, by the second base station, a request from a first base station, the request requesting the second base station to send downlink signaling to the UE; And
To the UE in order to transmit an aperiodic reference signal in a serving cell controlled by the first base station and to instruct the UE to periodically transmit a specific uplink transmission, And transmitting the uplink transmission data. The method of claim 9,
The particular uplink transmission may be an uplink transmission, which is a periodic reference signal, a sounding reference signal (SRS), a periodic channel status report, a channel quality indicator (CQI) report, Transmission processing method. delete delete A communication device for processing uplink transmissions in a wireless communication system, the communication device comprising:
A control circuit;
A processor provided in the control circuit; And
A memory installed in the control circuit and operatively coupled to the processor,
The processor comprising:
Connecting the communication device to at least two base stations including a first base station controlling a first serving cell and a second base station controlling a second serving cell;
Periodically transmitting, by the communication device, a specific uplink transmission in the first serving cell;
Stopping the specific uplink transmission in the first serving cell by the communication device; And
Transmitting an aperiodic reference signal in the first serving cell by the communication device in response to receiving the downlink signaling in the second serving cell, And execute the program code stored in the memory to process the uplink transmission by performing the step of resuming the particular uplink transmission in the cell. 14. The method of claim 13,
Wherein the communication device maintains the configuration of the specific uplink transmission when the specific uplink transmission is interrupted. 15. The method of claim 14,
The particular uplink transmission may be a communication link that is a periodic reference signal, a sounding reference signal (SRS), a periodic channel status report, a channel quality indicator (CQI) report, or a semi-persistent uplink transmission. . 14. The method of claim 13,
Wherein the communication device aborts the particular uplink transmission in the first serving cell when the timer is not running due to expiration of the timer or when a command is received from the network. A communication device for processing uplink transmissions in a wireless communication system, the communication device comprising:
A control circuit;
A processor provided in the control circuit; And
A memory installed in the control circuit and operatively coupled to the processor,
The processor comprising:
Connecting the communication device to at least two base stations including a first base station controlling a first serving cell and a second base station controlling a second serving cell;
Periodically transmitting, by the communication device, a specific uplink transmission in the first serving cell;
Stopping the specific uplink transmission in the first serving cell by the communication device; And
When the communication device triggers a scheduling request or when the communication device detects that the beam set of the first serving cell for the communication device has changed, And to execute the program code stored in the memory to process the uplink transmission by performing the step of resuming the link transmission. 18. The method of claim 17,
The communication device comprising:
Detecting the beam based on a power of a DL reference signal received by the communication device and associated with the beam that is greater than a threshold or based on a transmission timing or resource of the DL reference signal associated with the beam, Device. 18. The method of claim 17,
Wherein the communication device maintains the configuration of the specific uplink transmission when the specific uplink transmission is interrupted. 18. The method of claim 17,
The particular uplink transmission may be a communication link that is a periodic reference signal, a sounding reference signal (SRS), a periodic channel status report, a channel quality indicator (CQI) report, or a semi-persistent uplink transmission. . A communication device for processing uplink transmissions in a wireless communication system, the communication device comprising:
A control circuit;
A processor provided in the control circuit; And
A memory installed in the control circuit and operatively coupled to the processor,
The processor comprising:
Receiving, by the communication device, a request from a first base station, the request requesting the communication device to send downlink signaling to a user terminal (UE); And
To the UE, to transmit an aperiodic reference signal in a serving cell controlled by the first base station and to instruct the UE to periodically transmit a specific uplink transmission, And execute the program code stored in the memory to process the uplink transmission by performing the transmitting step. 23. The method of claim 21,
The particular uplink transmission may be a communication link that is a periodic reference signal, a sounding reference signal (SRS), a periodic channel status report, a channel quality indicator (CQI) report, or a semi-persistent uplink transmission. .

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