1337 results about "Discontinuous reception" patented technology

A method, terminal device, network element, system and computer program product for controlling discontinuous reception or transmission at a terminal device of a communication network are disclosed. A regular discontinuous reception or transmission cycle of a regular discontinuous reception or transmission scheme is set by using a first control layer, and in addition thereto a shorter temporary discontinuous reception or transmission cycle of an interim discontinuous reception or transmission scheme can be set by using a second control layer. This arrangement provides long discontinuous reception or transmission cycles for power consumption improvements while at the same time ensuring that the network can easily and flexibly shorten these cycles for increased data throughput, if needed.

A method, receiving device, network element, system and computer program product for controlling discontinuous reception at a receiving device of a communication network are disclosed. A regular discontinuous reception cycle of a discontinuous reception scheme is set, and this regular discontinuous reception cycle is switched to a shorter temporary discontinuous reception cycle or is switched off, in response to an event which triggers a reply of the communication network to the receiving device. Thereby, delays of network replies can be shortened or controlled in case discontinuous reception (DRX) cycles are implemented at the receiving device.

The invention relates to methods for improving the DRX operation of a UE by introducing an additional DRX wake-up cycle, which runs in parallel to the short and/or long DRX cycle. The DRX wake-up cycle defines time intervals after which the UE starts monitoring the PDCCH for a wake-up duration of time; the UE does not perform any other operation during the wake-up duration apart from monitoring the PDCCH. The time intervals of the wake-up cycle between the wake-up durations are preferably shorter than the one of the DRX long cycle, and may have the same or a shorter length than the ones of the DRX short cycle. The wake-up duration may be as long as the on-duration of the DRX short/long cycle, or may be preferably much shorter, such as only one or a few subframes.

An apparatus and method for receiving an MBMS (Multimedia Multicast/Broadcast Service) notification indicator is disclosed to discontinuously receive an MBMS notification indicator in a mobile communication system. A mobile terminal receives and stores a terminal-specific DRX (Discontinuous Reception) cycle length and the longest DRX cycle length broadcasted in a cell. The mobile terminal discontinuously receives a notification indicator for a specific MBMS during a terminal-specific DRX cycle length of the longest DRX cycle length by using the stored terminal-specific DRX cycle length and the longest DRX cycle length used in a cell.

The method for discontinuously monitoring downlink control channel in a user equipment in a wireless communication system includes receiving a discontinuous reception (DRX) Start Offset from a base station to be used for both a first DRX Cycle and a second DRX Cycle, and starting an On Duration Timer at a subframe that satisfies either a first condition for the first DRX Cycle or a second condition for the second DRX Cycle, wherein a first DRX offset used in the first condition is based upon the DRX Start Offset received from the base station, and wherein a second DRX offset used in the second condition is based upon a remainder of the DRX Start Offset received from the base station after a modulo operation by the second DRX Cycle.

This invention relates to a method for reporting SRS in discontinuous reception and a wireless communication system thereof. The wireless communication system includes a user equipment (UE), a serving cell and a base station. The UE is for transmitting a periodic Sounding Reference Signal (SRS) and an aperiodic SRS, wherein the UE monitors a PDCCH in an active time. The serving cell has a serving range, wherein the UE is in the serving range of the serving cell. The base station is for performing connection to the UE and serving the serving cell. The UE transmits the aperiodic SRS no matter whether UE is in active time or not when the UE has been triggered to report the aperiodic SRS by a SRS request from the base station.

A method and an apparatus for supporting a discontinuous reception (DRX) operation in a Node B in a mobile communication system are provided. The method includes defining a second System Frame Number (SFN) where one cycle of a first SFN corresponds to one bit, transmitting information on the second SFN to a User Equipment (UE), determining a second SFN which is used to transmit a paging signal to the UE, determining a first SFN which is used to transmit the paging signal in the determined second SFN, and transmitting the paging signal to the UE at the determined first SFN.

A method and apparatus for increasing the success rate of a handover of a connected mode UE while minimizing the power consumption of the UE during DRX operation in a mobile communication system is provided. The method includes the steps of transmitting a cell change report to the serving base station, and then suspending the DRX operation to transition to an active mode; receiving a handover command message, and completing the handover to a target cell; checking if the handover command message includes a DRX resume command; waiting until a control message including the DRX resume command is received from the target base station; and after the control message including the DRX resume command is received, transitioning from the active mode to a sleep mode, and resuming the DRX operation.

Disclosed herein are a method and apparatus for monitoring UE reachability in a wireless communication system. A method for monitoring UE reachability may include receiving, by a Mobility Management Entity, a monitoring request message for UE reachability including a maximum response time from a Home Subscriber Server, detecting, by the MME, the UE reachability if it is expected that paging is able to be transmitted to UE when extended Discontinuous Reception is applied to the UE, and sending, by the MME, a UE reachability notification to a Service Capability Exposure Function before a next paging occasion of the UE, wherein the maximum response time may indicate a time during which the UE maintains a reachable state so that downlink data is reliably delivered to the UE, and wherein an occasion when the UE reachability notification is transmitted may be determined by taking into consideration the maximum response time.

A method and apparatus for avoiding in-device interference in a terminal equipped with multiple heterogeneous communication modules (e.g. Long Term Evolution (LTE), Wireless Local Area Network (WLAN), Bluetooth, and Global Positioning System (GPS) modules) are provided. The method includes one of detecting and predicting interference caused by the second communication module to communication of the first communication module, transmitting an interference occurrence information message to a base station for controlling to avoid the interference, and controlling to avoid the interference by executing one of a handover and discontinuous reception according to a control command included in an interference occurrence information response message transmitted by the base station. The terminal provides the cell with the interference-related information, the cell configures the Discontinuous Reception (DRX) based on the interference-related information, and the terminal can reduce in-device interference through the controlled DRX operation, resulting in improvement of communication reliability of the communication modules.

In a method for optimizing discontinuous reception mechanism in random access or scheduling request, the user equipment behaves according to a TTI window and a contention resolution timer so that the user equipment is at active time to monitor PDCCH. In the random access, the UE is at active time while a PDCCH indicating a new transmission addressed to the C-RNTI of the UE has not been received after successful reception of a Random Access Response for the non-contention preamble. In the scheduling request, the UE is at active time while an UL grant for the UE has not been received after SR has been sent.

A method and apparatus is configured to control a discontinuous reception (DRX) in a mobile communication system. The method includes: interrupting the DRX operation when a radio resource control (RRC) connection reestablishment procedure is initiated; transmitting an RRC connection reestablishment request message from the user equipment to an evolved node B (ENB); receiving an RRC connection reestablishment message from the ENB to the user equipment; and resuming, if the received RRC connection reestablishment message contains new DRX setting information, the interrupted DRX operation according to the new DRX setting information. The DRX operation can be interrupted or resumed at a proper time point when an RRC connection is reestablished or reconfigured or a handover is performed, thereby reducing power consumption in the user equipment.

A method and equipment for determining the transmission resource of channel quality indicator are disclosed. They are applied in Time Division Duplex TDD system and Half Duplex-Frequency Division Duplex HD-FDD system when Discontinuous Reception DRX operation is adopted. The method includes the following steps: determining the location of the downlink subframe where the start point of monitoring Physical Downlink Control Channel PDCCH in DRX cycle is located; determining whether the transmission resource used for transmitting the Channel Quality Indicator CQI is an uplink subframe previous to the determined location or one or more uplink subframes after the determined location. Availability of the CQI information when performing downlink schedule is guaranteed, and the transmission resource used for transmitting CQI can be effectively saved.

A method and apparatus for performing measurement by a User Equipment (UE) in a mobile communication system are provided. The UE has a Discontinuous Reception (DRX) mode for discontinuously receiving data and a continuous reception mode for continuously receiving data. The mobile communication system also has a serving cell where the UE is located, and a neighboring cell located near the serving cell. Signal strength of the serving cell is measured according to a period of the DRX mode. The signal strength measurement is continuously performed on the serving cell and the neighboring cell, if the measured signal strength of the serving cell is less than or equal to a particular threshold. The continuous signal strength measurement is stopped and signal strength of the serving cell is measured according to the period of the DRX mode, if the continuously measured signal strength of the serving cell is greater than the particular threshold.

The present invention has disclosed a method for setting an active period starting point for a User Equipment (UE) in a Discontinuous Reception (DRX) mode, comprising steps of: a base station calculating and storing a position of the active period starting point for the UE based on predetermined parameters, so as to transmit data to the UE in a corresponding active period; the UE receiving Radio Resource Control (RRC) configuration information from the base station, and detecting whether the DRX mode is configured in it or not; the UE calculating its active period starting point based on predetermined DRX parameters in the received RRC configuration information; and the UE starting DRX based on the calculated active period starting point. The present invention has also disclosed an apparatus for setting an active period starting point for a UE in a DRX mode.

A communication system is presented, which is capable of sending a transmission over an interface having at least two aggregated component carriers including a primary component carrier and at least one secondary component carrier, wherein the primary component carrier has a physical downlink control channel (PDCCH) associated therewith and wherein the PDCCH is capable of signaling allocations for the primary component carrier and the at least one secondary component carrier. A method of operating a network element including sending to a user equipment a transmission indication indicative of the transmission in the PDCCH of the primary component carrier. A method of operating a user equipment includes monitoring downlink control signaling for a transmission indication indicative of a transmission to the user equipment only on the PDCCH of the primary component carrier.

Provided is a method and apparatus for discontinuously transmitting/receiving packets for low-power consumption of a terminal in a cellular system for packet transmission. The present research provides a method and apparatus that can perform a low-power consuming operation when a terminal is in active state in a cellular system. The method for discontinuously transmitting/receiving packet data to reduce power consumption of a terminal in a cellular system, including the steps of: a) establishing discontinuous reception/transmission (DRX/DTX) parameters including discontinuous DRX/DTX cycle information for terminals operating in a transmission suspension mode, which is a sub-state of an active state; and b) performing DRX/DTX based on the DRX/DTX parameters in the terminals operating in the transmission suspension mode.

Disclosed are systems and methods that allow the a mobile communications device to perform inter-frequency and inter-RAT measurements while receiving MBMS data. As disclosed, control of measurement occasions are decided on by the UE using Discontinuous Reception during Forward Access Channel reception. Using aspects of the disclosed embodiments, each UE individually decides when to perform inter-frequency/RAT measurements (provided performance requirements on cell reselection are met). Outer coding procedures may then be performed to recover data lost during the measurements.

An apparatus and method for discontinuous reception in multiple component carrier system are provided. A method for a discontinuous reception (DRX) operation by a half-duplex UE in multiple component carrier system includes identifying whether a current subframe is a physical downlink control channel (PDCCH) subframe; perform PDCCH monitoring on the identified PDCCH subframe during an active time of a DRX cycle; and counting a DRX-related timer included in the active time in the identified PDCCH subframe.

The present invention provides for a method of controlling discontinuous reception cycles in a mobile radio communications device, and discontinuous transmission cycles in a mobile radio communication network device, and comprising the steps of monitoring the number of consecutive discontinuous reception and transmission periods within which no data is received, monitoring the number of consecutive discontinuous reception and transmission periods within which data is received, and varying the said discontinuous reception cycle responsive to the result of said monitoring.

In a cellar system providing various packet services, sleep mode operation of a terminal in an idle state is controlled. The cellular system determines a discontinuous receiving (DRX) period according to a QoS of a packet service provided to the terminal, and runs the sleep mode according to the determined DRX period. The cellular system runs the sleep mode divided into shallow sleep duration and deep sleep duration. With this manner, a paging delay to the terminal and a power consumption of the terminal may be reduced.

A method and system for controlling discontinuous reception (DRX) in a mobile device in a wireless communications network that supports voice-over-internet-protocol (VoIP) and that uses an automatic repeat-request (ARQ) method, like a hybrid automatic repeat-request (HARQ) method, uses autonomous DRX control after initial VoIP traffic setup. If the mobile device transmits a negative-acknowledgement signal (NACK) indicating unsuccessful receipt of a VoIP packet, then it autonomously turns on a predetermined delay time later to receive the retransmission of the VoIP packet, where the predetermined delay time is related to the time for the base station to process the NACK and prepare the VoIP packet for retransmission. When the mobile device transmits or retransmits a VoIP packet, reception is deactivated, but is autonomously activated the predetermined delay time later to receive an acknowledgement signal (ACK) or NACK. VoIP packets may be transmitted from the mobile device the predetermined delay time before VoIP packets are transmitted from the base station. This alignment allows an ACK or NACK to be transmitted from the base station in the same transmission time interval (TTI) as a VoIP packet.