WO2014073799A1 - Appareil et procédé pour effectuer une opération d'économie d'énergie d'un terminal sur la base d'une réception discontinue - Google Patents

Appareil et procédé pour effectuer une opération d'économie d'énergie d'un terminal sur la base d'une réception discontinue Download PDF

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Publication number
WO2014073799A1
WO2014073799A1 PCT/KR2013/009296 KR2013009296W WO2014073799A1 WO 2014073799 A1 WO2014073799 A1 WO 2014073799A1 KR 2013009296 W KR2013009296 W KR 2013009296W WO 2014073799 A1 WO2014073799 A1 WO 2014073799A1
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WIPO (PCT)
Prior art keywords
terminal
drx
power saving
base station
saving operation
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PCT/KR2013/009296
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English (en)
Korean (ko)
Inventor
권기범
안재현
정명철
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주식회사 팬택
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Publication of WO2014073799A1 publication Critical patent/WO2014073799A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to wireless communication, and more particularly, to an apparatus and method for performing a power saving operation of a terminal based on discontinuous reception.
  • ARQ Automatic Repeat Request
  • ACK acknowledgment signal
  • NACK Non Acknowledgment
  • HARQ hybrid-ARQ
  • the HARQ scheme not only retransmits data that failed to be received by the transmitter as in the conventional ARQ, but also stores the data that the receiver does not discard, but increases the performance gain by combining the retransmitted data with previously stored data.
  • a receiver uses a separate feedback radio resource for feeding back an ACK / NACK signal to a transmitter, efficient use of limited feedback radio resources has emerged as an important issue.
  • the UE does not know whether the base station has properly received the uplink data after transmitting the uplink data through the uplink (PUSCH). Accordingly, the UE continues to keep the uplink data in the HARQ buffer, and the DRX activity time (to transmit a PDCCH including a retransmission request (transmitted in an UL grant scheme)) may exist from the base station. active time).
  • the uplink data is kept in the HARQ buffer even after receiving the HARQ ACK for the uplink data from the base station. This is to respond to a request for retransmission of the uplink data from the base station after the terminal receives the HARQ ACK.
  • HARQ ACK may be interpreted as "waiting for retransmission first" rather than a base station successfully receiving uplink data. Accordingly, since data is stored in the HARQ buffer until the maximum number of HARQ retransmissions is reached, the DRX state of the UE maintains an active time.
  • An object of the present invention is to provide an apparatus and method for performing a power saving operation of a terminal based on discontinuous reception.
  • Another object of the present invention is to provide an apparatus and method for transmitting DRX configuration information constituting a power saving operation of a terminal.
  • Another technical problem of the present invention is to provide an apparatus and method for realizing power saving of a terminal by terminating an active time by flushing an HARQ buffer.
  • Another technical problem of the present invention is to provide an apparatus and method for terminating an active time of an HARQ ACK of an eNB in adaptive retransmission, non-adaptive retransmission, or synchronized retransmission when performing UL HARQ.
  • the method includes transmitting power saving related information to a base station, and receiving, from the base station, DRX configuration information including a DRX_UL-HARQack field that supports a power saving operation based on DRX to the terminal. .
  • flushing the HARQ buffer storing the uplink data is performed. It may include a step.
  • a terminal for performing a power saving operation based on DRX includes an information generation unit for generating power saving related information, a transmitter for transmitting the power saving related information to the base station, and DRX configuration information including a DRX_UL-HARQack field for supporting the terminal with a power saving operation based on DRX.
  • the HARQ controller stores the uplink data in the HARQ buffer. It may include flushing.
  • a method of performing a power saving operation of a terminal based on DRX by a base station includes receiving power saving related information from the terminal, determining whether to support a power saving operation for the terminal based on the power saving related information, and supporting the power saving operation based on DRX to the terminal. And transmitting the DRX configuration information including the DRX_UL-HARQack field to the terminal.
  • the terminal when the DRX_UL-HARQack is configured in the terminal and the terminal receives only HARQ ACK for uplink data from the base station, the terminal stores the uplink data. It may include flushing the HARQ buffer.
  • a base station that performs a power saving operation of a terminal based on DRX.
  • the base station includes a receiver for receiving power saving related information from the terminal, a determining unit determining whether to support a power saving operation for the terminal based on the power saving related information, and supporting the power saving operation based on DRX to the terminal.
  • an information generator for generating DRX configuration information including a DRX_UL-HARQack field, and a transmitter for transmitting HARQ ACK for the DRX configuration information and uplink data to the terminal.
  • the terminal stores the uplink data in HARQ. It may include flushing the buffer.
  • the terminal may terminate the unnecessary DRX activity time early, thereby reducing power consumption generated by monitoring the PDCCH during the activity time.
  • the HARQ buffer may be flushed to terminate the active time, thereby realizing power saving of the UE.
  • FIG. 1 shows a wireless communication system to which the present invention is applied.
  • FIG. 2 is a flowchart illustrating a power saving operation of a terminal based on discontinuous reception according to an example of the present invention.
  • FIG. 3 is a flowchart illustrating a method of performing a power saving operation of a terminal by a terminal according to an exemplary embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating a method of performing a power saving operation of a terminal by a base station according to an exemplary embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating a power saving operation of a terminal based on discontinuous reception according to another embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a method of performing a power saving operation of a terminal by a terminal according to another embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a method of performing a power saving operation of a terminal by a base station according to another embodiment of the present invention.
  • FIG. 8 is a block diagram illustrating a terminal and a base station according to the first embodiment of the present invention.
  • FIG. 9 is a block diagram illustrating a terminal and a base station according to the second embodiment of the present invention.
  • FIG. 10 is an explanatory diagram illustrating a power saving operation based on DRX according to an embodiment of the present invention.
  • the present specification describes a wireless communication network
  • the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be done at the terminal coupled to the network.
  • FIG. 1 shows a wireless communication system to which the present invention is applied.
  • the wireless communication system 10 is widely deployed to provide various communication services such as voice and packet data.
  • the wireless communication system 10 includes at least one base station (BS) 11.
  • BS base station
  • Each base station 11 provides a communication service for specific cells 15a, 15b, and 15c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the mobile station (MS) 12 may be fixed or mobile, and may include a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.
  • the base station 11 may be called in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, an femto base station, a home nodeB, a relay, and the like. .
  • eNB evolved-NodeB
  • BTS base transceiver system
  • the cell should be interpreted in a comprehensive sense of a part of the area covered by the base station 11 and encompasses various coverage areas such as megacells, macrocells, microcells, picocells and femtocells.
  • downlink means communication from the base station 11 to the terminal 12, and uplink means communication from the terminal 12 to the base station 11.
  • the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12.
  • the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-FDMA
  • OFDM-FDMA OFDM-FDMA
  • OFDM-TDMA OFDM-TDMA
  • various multiple access schemes such as OFDM-CDMA may be used.
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • the physical downlink control channel informs the terminal of resource allocation of a paging channel (PCH) and downlink shared channel (DL-SCH) and hybrid automatic repeat request (HARQ) information related to the DL-SCH.
  • the PDCCH may carry an uplink grant informing the UE of resource allocation of uplink transmission.
  • the physical control format indicator channel informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe.
  • PHICH physical Hybrid ARQ Indicator Channel
  • PHICH physical Hybrid ARQ Indicator Channel
  • Physical uplink control channel (PUCCH) carries uplink control information such as HARQ ACK / NACK signal, scheduling request and CQI for downlink transmission.
  • Physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH).
  • a physical random access channel (PRACH) carries a random access preamble.
  • the base station transmits HARQ ACK to the terminal and there is no intention of retransmission, the base station keeps uplink data in the HARQ buffer, and the terminal still needs to maintain an active time to continuously monitor the PDCCH.
  • NACK-to-ACK error An error that determines that data transmission is successful because the terminal incorrectly receives an NACK transmitted from the base station as an ACK due to a poor link performance between the base station and the terminal is referred to as a NACK-to-ACK error. If the UE flushes the HARQ buffer corresponding to the HARQ process transmitted immediately after receiving the ACK, the UE may not proceed with retransmission even when the BS receives a retransmission request.
  • the terminal has flexibility for the retransmission request of the base station.
  • the base station should be able to control retransmission request using only ACK / NACK (PHICH) signaling without PDCCH and uplink resource consumption.
  • ACK / NACK PHICH
  • the uplink retransmission request must be transmitted through the PDCCH, thereby increasing the load on the PDCCH. Therefore, the base station should be able to use the ACK / NACK signaling without resource consumption for the retransmission request control.
  • the BS may fail to request retransmission for the HARQ process requiring HARQ retransmission due to a traffic load in a specific subframe. Because the general HARQ process on the terminal side retransmits when receiving the NACK, and determines that the transmission is successful when receiving the ACK does not prepare for retransmission to occur later. However, in a wireless communication system in which uplink HARQ operation is operated in a synchronized manner, retransmission is required for a corresponding HARQ process, but a retransmission cannot be requested in the current subframe. That is, it is impossible to delay retransmission for the corresponding HARQ process.
  • the synchronization operation method is a method in which the location of the allocated subframe is fixed for each HARQ process, the opportunity for retransmission for the corresponding HARQ process is limited to the fixed subframe location. Accordingly, the terminal expects the response of the base station to the fixed retransmission opportunity.
  • the ACK / NACK processing in the general HARQ process of the terminal described above it is impossible to control the base station for retransmission delay for the HARQ process.
  • HARQ NACK may be received at the next retransmission time point, and ii) if it is assumed that retransmission is possible, the base station prefers HARQ ACK to delay retransmission for the HARQ process requiring retransmission. After the transmission and after the problem situation such as traffic load is released by transmitting a HARQ NACK it is possible to control the terminal to retransmit at the desired time point.
  • FIG. 2 is a flowchart illustrating a power saving operation of a terminal based on discontinuous reception according to an example of the present invention.
  • the terminal transmits power saving related information to the base station (S200).
  • the power saving related information is basic data used for determining whether the base station takes power saving operation for the terminal.
  • the embodiment may further include the step of determining, by the terminal, the necessity of the power saving operation before the terminal transmits power saving related information (not shown in the figure).
  • the power saving related information may include a power priority indicator (PPI) indicating that the terminal prefers a configuration optimized for power saving.
  • PPI power priority indicator
  • a procedure of transmitting a power priority indicator by the terminal may be used, which may be referred to as UE assistance information tx procedure.
  • the base station may transmit a powerPrefIndication-Enabled field in the powerPrefIndicationConfig field, which is an RRC connection reconfiguration parameter, to the terminal. This allows the terminal to transmit the power priority indicator through the terminal assistance information transmission procedure.
  • the terminal may set the power priority indicator to 'low power consumption' and transmit the power priority indicator to the base station in the terminal assistance information.
  • the power saving related information may include signal strength information about the serving cell of the terminal.
  • at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), and S-measure may be used as signal strength information about the serving cell of the terminal.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • S-measure may be used as signal strength information about the serving cell of the terminal.
  • a final result value in which offset information is added to the signal strength information may be used as power saving related information.
  • the reference value of the S-measure is one of the main configuration information (or indicators) that can measure the radio link performance between the current serving cell and the terminal. For example, if the signal strength information of the serving cell is greater than or equal to the S-measure reference value, the terminal does not perform a signal strength measurement operation for the neighbor cell. On the other hand, if the signal strength information of the serving cell is less than the S-measure reference value, the terminal performs the signal strength measurement operation for the neighbor cell. The terminal transmits the result of performing the measurement operation to the base station as power saving related information as in step S200.
  • the power saving related information may be that transmission is triggered based on a radio resource management (RRM) measurement report event.
  • RRM radio resource management
  • a specific RRM measurement report event (for example, event 1A) is set to determine a radio link performance degradation, and when an event is triggered, the terminal transmits the measurement report as power saving related information to the base station as shown in step S200. .
  • the base station determines whether to support a power saving operation for the terminal based on the power saving related information (S205). As an example, the base station may determine whether to support the power saving operation for the terminal that transmits the power priority indicator set to low power consumption as power saving related information. As another example, the base station may determine whether to support the power saving operation for the terminal in consideration of the signal strength for the serving cell as well as the power priority indicator. For example, the base station may determine to support a power saving operation for a terminal whose signal strength for the serving cell is large enough. As another example, when the base station determines that the radio link performance between the terminal and the base station is degraded later, the base station may determine to support the power saving operation for the terminal.
  • the base station for the terminal may be decided to support power saving operation.
  • the base station may determine to support the power saving operation for the terminal based on the signal strength information of the serving cell obtained through the periodic RRM measurement report.
  • the base station may generate DRX configuration information including a field indicating that the power saving operation is supported (S210).
  • the field indicating that the power saving operation is supported may be indicated as a DRX_UL-HARQack field.
  • the DRX_UL-HARQack field may be defined as configuration information capable of ending an active time when receiving an HARQ ACK for uplink transmission.
  • DRX configuration information including the DRX_UL-HARQack field may be defined, for example, as shown in the following table.
  • MAC-MainConfig :: SEQUENCE ⁇ ... drx-Config_1 DRX-Config_1 OPTIONAL,-Cond DRX_1 ... drx-Config_2 DRX-Config_2 OPTIONAL-Cond DRX_2 drx_UL-HARQack ENUMERATED ⁇ support ⁇ OPTIONAL-Cond DRX-config ⁇
  • the DRX configuration information includes a first DRX Config field (DRX Config_1) that defines DRX operation parameters for a terminal and a second DRX Config including DRX operation parameters according to inter device coexistance (IDC). Only one of the fields DRX Config_2 may be included. That is, when the first DRX Config field is included in the DRX configuration information, the second DRX Config field is not included in the DRX configuration information. In addition, when the second DRX Config field is included in the DRX configuration information, the first DRX Config field is not included in the DRX configuration information.
  • the first DRX Config field may mean, for example, a DRX config corresponding to release version 8 in the LTE system
  • the second DRX Config field may mean a DRX config corresponding to release version 11 in the LTE system, for example. Can be. Even when only the first DRX-config is used for the non-IDC regardless of the release version, the conditional presence for the first DRX-config may be defined in the same manner. Alternatively, the conditional presence for the DRX_UL-HARQack field may be defined as one of DRX_1 or DRX_2.
  • the DRX_UL-HARQack field may be selectively included in the DRX configuration information only when the first DRX Config field or the second DRX Config field is included in the DRX configuration information.
  • the base station determines to support the power saving operation for the terminal, the base station includes a DRX_UL-HARQack field in the DRX configuration information as shown in Table 1 above.
  • the base station determines not to support the power saving operation for the terminal, the base station does not include the DRX_UL-HARQack field in Table 1.
  • the base station transmits the DRX configuration information generated in step S210 to the terminal (S215).
  • the terminal Upon receiving the DRX configuration information from the base station, the terminal confirms that the DRX_UL-HARQack exists in the DRX configuration information, and the terminal configures the DRX_UL-HARQack (S220). Transmission and configuration of the DRX_UL-HARQack is performed at the RRC layer level and is completed using the RRC connection reconfiguration procedure.
  • the DRX configuration information of step S215 is included in the RRC connection reconfiguration message and transmitted from the base station to the terminal, and the DRX_UL-HARQack configuration of step S220 corresponds to the RRC connection reconfiguration of the terminal.
  • the base station transmits the HARQ ACK for the uplink data received from the terminal to the terminal (S225).
  • the present embodiment includes a step of receiving an uplink grant (including a new data indicator) from a base station by a terminal before transmitting step S225 to transmit a new uplink data to the base station;
  • the method may further include transmitting the uplink data to a base station using an uplink resource allocated by an uplink grant.
  • the HARQ ACK may be mapped to the PHICH and transmitted to the terminal.
  • the base station may transmit the HARQ ACK only when the UE for which the DRX_UL-HARQack is configured does not need retransmission for the corresponding HARQ process later.
  • the terminal When the terminal receives the HARQ ACK in a state where the DRX_UL-HARQack is configured, the terminal performs a power saving operation (S230). That is, the power saving operation is condition that the DRX_UL-HARQack is configured in the terminal, and the terminal receives only HARQ ACK for uplink HARQ data from the base station.
  • Receiving only HARQ ACK may mean receiving only HARQ ACK without receiving an uplink grant.
  • the power saving operation may be defined as the following operation.
  • the power saving operation includes the terminal flushing the HARQ buffer storing the uplink data.
  • HARQ buffer is managed by the MAC layer of the terminal. Therefore, when the MAC layer receives the HARQ ACK and determines that the DRX_UL-HARQack is configured in the RRC layer, the HARQ buffer may be flushed. Of course, flushing of the HARQ buffer may be performed even after retransmission is performed up to the maximum number of HARQ retransmissions of the UE. However, this is different from the cause of the HARQ buffer flush by the DRX_UL-HARQack configuration.
  • the flushing of the HARQ buffer affects the DRX operation.
  • the activity time is i) DRX-related timer (onduration timer, DRX inactivity timer, DRX retransmission timer or MAC contention resolution timer) is in progress ( running), ii) a scheduling request is sent on PUCCH, a pending time, and iii) an uplink grant for pending HARQ retransmission can occur, and data in its corresponding HARQ buffer This can be defined as the time that is present.
  • DRX-related timer onduration timer, DRX inactivity timer, DRX retransmission timer or MAC contention resolution timer
  • the power saving operation may mean that the terminal ends the active time.
  • the UE can terminate the unnecessary DRX activity time early, thereby reducing power consumption generated by monitoring the PDCCH during the activity time.
  • FIG. 3 is a flowchart illustrating a method of performing a power saving operation of a terminal by a terminal according to an exemplary embodiment of the present invention.
  • the terminal transmits power saving related information to the base station (S300).
  • the power saving related information is basic data used to determine whether the base station takes power saving operation for the terminal.
  • the embodiment may further include a step of determining, by the terminal, the necessity of a power saving operation before the terminal transmits power saving related information before step S300 (not shown).
  • the power saving related information may include a power priority indicator (PPI) indicating that the terminal prefers a configuration optimized for power saving.
  • PPI power priority indicator
  • a procedure of transmitting a power priority indicator by the terminal may be used, which may be referred to as a terminal assistance information transmission procedure.
  • the terminal may receive a powerPrefIndicationConfig field including the powerPrefIndication-Enabled field from the base station before step S300.
  • the terminal assistance information transmission procedure the terminal is allowed to transmit the power priority indicator.
  • the terminal may set the power priority indicator to 'low power consumption' and transmit the power priority indicator to the terminal assistance information to the base station.
  • the power saving related information may include signal strength information about the serving cell of the terminal.
  • at least one of reference signal to reception signal (RSRP), reference signal to reception quality (RSRQ), and S-measure may be used as signal strength information on the serving cell of the terminal.
  • RSRP reference signal to reception signal
  • RSRQ reference signal to reception quality
  • S-measure may be used as signal strength information on the serving cell of the terminal.
  • the reference value of the S-measure is one of the main configuration information (or indicators) that can measure the radio link performance between the current serving cell and the terminal. For example, if the signal strength information of the serving cell is greater than or equal to the S-measure reference value, the terminal does not perform a signal strength measurement operation for the neighbor cell. On the other hand, if the signal strength information of the serving cell is less than the S-measure reference value, the terminal performs the signal strength measurement operation for the neighbor cell. The terminal transmits the result of performing the measurement operation to the base station as power saving related information as in step S300.
  • the power saving related information may be that transmission is triggered based on the RRM measurement report event.
  • a specific RRM measurement report event for example, event 1A
  • the terminal transmits the measurement report as power saving related information to the base station as shown in step S300.
  • the terminal receives DRX configuration information including a field indicating that the power saving operation is supported (S305).
  • a field indicating that the power saving operation is supported may be indicated by a DRX_UL-HARQack field.
  • the DRX_UL-HARQack field may be defined as configuration information capable of ending an active time when receiving an HARQ ACK for uplink transmission.
  • DRX configuration information including the DRX_UL-HARQack field may be defined, for example, as shown in Table 1 above.
  • the terminal configures the DRX_UL-HARQack (S310).
  • the configuration of DRX_UL-HARQack is performed at the RRC layer level and is completed using the RRC connection reconfiguration procedure.
  • the DRX configuration information of step S305 is included in the RRC connection reconfiguration message and transmitted from the base station to the terminal, and the DRX_UL-HARQack configuration of step S310 corresponds to the RRC connection reconfiguration of the terminal.
  • the terminal receives the HARQ ACK for the uplink data transmitted to the base station from the base station (S315).
  • the present embodiment includes a step of receiving an uplink grant (including a new data indicator) from the base station by the terminal before transmitting the new uplink data (new uplink data) to the base station before step S315;
  • the method may further include transmitting the uplink data to a base station using an uplink resource allocated by an uplink grant.
  • the terminal When the terminal receives the HARQ ACK in a state in which the DRX_UL-HARQack is configured, the terminal performs a power saving operation (S320). That is, the power saving operation is condition that the DRX_UL-HARQack is configured in the terminal, and the terminal receives only HARQ ACK for uplink HARQ data from the base station.
  • Receiving only HARQ ACK may mean receiving only HARQ ACK without receiving an uplink grant.
  • the power saving operation may be defined as the following operation.
  • the power saving operation includes the terminal flushing the HARQ buffer storing the uplink data.
  • HARQ buffer is managed by the MAC layer of the terminal. Therefore, when the MAC layer receives the HARQ ACK and determines that the DRX_UL-HARQack is configured in the RRC layer, the HARQ buffer may be flushed.
  • the flushing of the HARQ buffer affects the DRX operation.
  • the active time is i) the time during which DRX-related timers (durability timer, DRX inactivity timer, DRX retransmission timer or MAC contention resolution timer) are in progress, ii) scheduling request is sent on PUCCH, and pending ), And iii) an uplink grant for pending HARQ retransmission may occur, and may be defined as the time at which data in the corresponding HARQ buffer is present.
  • DRX-related timers durability timer, DRX inactivity timer, DRX retransmission timer or MAC contention resolution timer
  • scheduling request is sent on PUCCH, and pending
  • an uplink grant for pending HARQ retransmission may occur, and may be defined as the time at which data in the corresponding HARQ buffer is present.
  • the power saving operation may mean that the terminal ends the active time.
  • step S305 if the terminal determines that the DRX_UL-HARQack does not exist in the received DRX configuration information, the terminal performs a DRX operation according to the existing DRX configuration and the activity time does not change. Therefore, even if the UE receives the HARQ ACK in step S315, the UE continuously stores the uplink data in the HARQ buffer without flushing the HARQ buffer and does not perform a separate power saving operation. That is, since the activity time in the DRX does not end, the UE continuously performs PDCCH monitoring.
  • FIG. 4 is a flowchart illustrating a method of performing a power saving operation of a terminal by a base station according to an exemplary embodiment of the present invention.
  • the base station receives power saving related information from the terminal (S400).
  • the power saving related information is basic data used to determine whether the base station takes power saving operation for the terminal.
  • the power saving related information may include a power priority indicator (PPI) indicating that the terminal prefers a configuration optimized for power saving.
  • PPI power priority indicator
  • a procedure for receiving a power priority indicator by the base station may be used, which may be referred to as a terminal assistance information transmission procedure.
  • the present embodiment may further include transmitting, by the base station, the powerPrefIndication-Enabled field to the UE before the step S400 including the powerPrefIndicationConfig field, which is an RRC connection reconfiguration parameter. This allows the terminal to transmit the power priority indicator through the terminal assistance information transmission procedure.
  • the power saving related information may include signal strength information about the serving cell of the terminal.
  • at least one of reference signal to reception signal (RSRP), reference signal to reception quality (RSRQ), and S-measure may be used as signal strength information on the serving cell of the terminal.
  • RSRP reference signal to reception signal
  • RSRQ reference signal to reception quality
  • S-measure may be used as signal strength information on the serving cell of the terminal.
  • the reference value of the S-measure is one of the main configuration information (or indicators) that can measure the radio link performance between the current serving cell and the terminal. For example, if the signal strength information of the serving cell is greater than or equal to the S-measure reference value, the terminal does not perform a signal strength measurement operation for the neighbor cell. On the other hand, if the signal strength information of the serving cell is less than the S-measure reference value, the terminal performs the signal strength measurement operation for the neighbor cell. The base station receives the result of performing the measurement operation from the terminal as power saving related information as in step S400.
  • the power saving related information may be that transmission is triggered based on the RRM measurement report event.
  • a specific RRM measurement report event for example, event 1A
  • the base station receives the measurement report as power saving related information from the terminal as in step S400.
  • the base station determines whether to support a power saving operation for the terminal based on the power saving related information (S405).
  • the base station may determine whether to support the power saving operation for the terminal that transmits the power priority indicator set to low power consumption as power saving related information.
  • the base station may determine whether to support the power saving operation for the terminal in consideration of the signal strength for the serving cell as well as the power priority indicator. For example, the base station may determine to support a power saving operation for a terminal whose signal strength for the serving cell is large enough.
  • the base station may determine to support the power saving operation for the terminal.
  • the base station for the terminal may be decided to support power saving operation.
  • the base station may generate DRX configuration information including a field indicating that the power saving operation is supported (S410).
  • the field indicating that the power saving operation is supported may be indicated as a DRX_UL-HARQack field.
  • the DRX_UL-HARQack field may be defined as configuration information capable of ending an active time when receiving an HARQ ACK for uplink transmission.
  • DRX configuration information including the DRX_UL-HARQack field may be defined, for example, as shown in Table 1 above.
  • the base station defines a first DRX Config field (DRX Config_1) that defines the DRX operation parameters for the UE and a second DRX Config field (DRX Config_2) that defines the DRX operation parameters according to inter device coexistence (IDC). Only one of them may be included in the DRX configuration information. That is, if the base station includes the first DRX Config field in the DRX configuration information, the base station cannot include the second DRX Config field in the DRX configuration information. In addition, if the base station includes the second DRX Config field in the DRX configuration information, the base station cannot include the first DRX Config field in the DRX configuration information.
  • DRX Config_1 that defines the DRX operation parameters for the UE
  • DRX Config_2 that defines the DRX operation parameters according to inter device coexistence (IDC). Only one of them may be included in the DRX configuration information. That is, if the base station includes the first DRX Config field
  • the first DRX Config field may mean, for example, a DRX config corresponding to release version 8 in the LTE system
  • the second DRX Config field may mean a DRX config corresponding to release version 11 in the LTE system, for example. Can be. Even if only the first DRX-config is used for the non-IDC regardless of the release version, the conditional presence for the first DRX-config may be defined in the same manner. Alternatively, the condition existence for the DRX_UL-HARQack field may be defined as one of DRX_1 or DRX_2.
  • the base station may selectively include the DRX_UL-HARQack field in the DRX configuration information only when the first DRX Config field or the second DRX Config field is included in the DRX configuration information.
  • the base station determines to support the power saving operation for the terminal, the base station includes a DRX_UL-HARQack field in the DRX configuration information as shown in Table 1 above.
  • the base station determines not to support the power saving operation for the terminal, the base station does not include the DRX_UL-HARQack field in Table 1.
  • the base station transmits the DRX configuration information generated in step S410 to the terminal (S415).
  • the terminal Upon receiving the DRX configuration information from the base station, the terminal confirms that the DRX_UL-HARQack exists in the DRX configuration information, and the terminal configures the DRX_UL-HARQack. Transmission and configuration of the DRX_UL-HARQack is performed at the RRC layer level and is completed using the RRC connection reconfiguration procedure.
  • the DRX configuration information of step S415 is included in the RRC connection reconfiguration message and transmitted from the base station to the terminal, and the DRX_UL-HARQack configuration of the terminal corresponds to the RRC connection reconfiguration of the terminal.
  • the base station transmits the HARQ ACK for the uplink data received from the terminal to the terminal (S420).
  • the present embodiment includes a step of transmitting, by the base station, an uplink grant (including a new data indicator) to the terminal to receive new uplink data from the terminal before step S420;
  • the method may further include receiving the uplink data from the terminal through an uplink resource allocated by an uplink grant.
  • the HARQ ACK may be mapped to the PHICH and transmitted to the terminal.
  • the base station may transmit the HARQ ACK only when the UE for which the DRX_UL-HARQack is configured does not need retransmission for the corresponding HARQ process later.
  • the power saving operation method of the terminal based on an embodiment in which the field indicating that the power saving operation is supported is a DRX_UL-HARQack field. That is, the support of the power saving operation is configured to place a constraint on the DRX operation.
  • the HARQ maximum retransmission count field which is a parameter present in the configuration field of the uplink shared channel.
  • a second embodiment of supporting a power saving operation of a terminal based on the maximum number of HARQ retransmissions will be described.
  • FIG. 5 is a flowchart illustrating a power saving operation of a terminal based on discontinuous reception according to another embodiment of the present invention.
  • the terminal transmits power saving related information to the base station (S500). Operation related to step S500 and its subsequent operations include the spirit and embodiments described in step S200.
  • the base station determines whether to support a power saving operation for the terminal based on the power saving related information (S505). Operation related to step S505 and its subsequent operations include the technical spirit and embodiments described in step S205.
  • the base station determines to support the power saving operation for the terminal, the base station sets the value of the HARQ maximum retransmission (maxHARQ-Tx) field, which is a field indicating that the power saving operation is supported, to 'Infinity'. (S510). That is, the field indicating that the power saving operation is supported may be indicated by a parameter in the maxHARQ-Tx field, which is a field indicating the maximum number of times for uplink retransmission.
  • the surface area of the maxHARQ-Tx field value set to 'infinity' means that the terminal can continue to retransmit as long as the base station requests retransmission.
  • its inherent meaning may include supporting or commanding a power saving operation when receiving a HARQ ACK for uplink transmission from a base station.
  • the UL common channel configuration information (ul-SCH-Config) including the maxHARQ-Tx field set to 'infinity' may be defined as shown in the following table, for example.
  • the UL common channel configuration (ul-SCH-Config) field includes a maxHARQ-TX field, and the values that the maxHARQ-TX field may have are n1, n2,... , n24, n28, infinity, and spare1.
  • the value indicating that the power saving operation is supported through the maxHARQ-Tx field is expressed as infinity, but this is merely an example and may be expressed in other terms, and supports the intrinsic meaning or power saving operation. Any term that includes the meaning is included in the technical spirit of the present invention.
  • the base station transmits uplink common channel configuration information including the maxHARQ-Tx field set to 'infinity' to the terminal (S515).
  • the uplink shared channel configuration information may be included in MAC-Main Config information, which is a kind of RRC message, and transmitted to the terminal. Transmission and configuration of maxHARQ-TX is performed at the RRC layer level, and is completed using the RRC connection reconfiguration procedure.
  • uplink common channel configuration information including maxHARQ-TX of step S515 is included in the RRC connection reconfiguration message and transmitted from the base station to the terminal, and the maxHARQ-TX configuration of step S520 corresponds to the RRC connection reconfiguration of the terminal. .
  • the base station transmits an HARQ ACK for the uplink data received from the terminal to the terminal (S525).
  • the present embodiment includes a step of receiving an uplink grant (including a new data indicator) from the base station by the terminal before transmitting the new uplink data to the base station before step S525, and by the uplink grant.
  • the method may further include transmitting the uplink data to the base station using the allocated uplink resource.
  • the HARQ ACK may be mapped to the PHICH and transmitted to the terminal.
  • Receiving only HARQ ACK may mean receiving only HARQ ACK without receiving an uplink grant.
  • the power saving operation may be defined as the following operation.
  • the power saving operation includes the terminal flushing the HARQ buffer storing the uplink data.
  • the flushing of the HARQ buffer affects the DRX operation. This is because the active time in DRX operation is: i) the time during which the DRX related timer (Duration Timer, DRX Inactivity Timer, DRX Retransmission Timer, or MAC Contention Resolution Timer) is in progress, ii) the time when the scheduling request is sent on PUCCH and pending. And iii) an uplink grant for pending HARQ retransmission may occur and may be defined as the time at which data in the corresponding HARQ buffer is present.
  • the DRX related timer Duration Timer, DRX Inactivity Timer, DRX Retransmission Timer, or MAC Contention Resolution Timer
  • the power saving operation may mean that the terminal ends the active time.
  • FIG. 6 is a flowchart illustrating a method of performing a power saving operation of a terminal by a terminal according to another embodiment of the present invention.
  • the terminal transmits power saving related information to the base station (S600). Operation related to step S600 and its subsequent operations include the spirit and embodiments described in step S300.
  • the terminal receives uplink shared channel configuration information including the maxHARQ-Tx field set to 'infinity' from the base station (S605).
  • the uplink shared channel configuration information may be included in MAC-Main Config information, which is a kind of RRC message, and transmitted to the terminal. Transmission and configuration of maxHARQ-TX is performed at the RRC layer level, and is completed using the RRC connection reconfiguration procedure.
  • uplink common channel configuration information including maxHARQ-TX of step S605 is included in the RRC connection reconfiguration message and transmitted from the base station to the terminal, and the maxHARQ-TX configuration of step S610 corresponds to the RRC connection reconfiguration of the terminal. .
  • the terminal receives the HARQ ACK for the uplink data from the base station (S615).
  • the present embodiment includes a step of receiving an uplink grant (including a new data indicator) from the base station by the terminal before transmitting the new uplink data to the base station before step S615, and by the uplink grant.
  • the method may further include transmitting the uplink data to the base station using the allocated uplink resource.
  • Receiving only HARQ ACK may mean receiving only HARQ ACK without receiving an uplink grant.
  • the power saving operation may be defined as the following operation.
  • the power saving operation includes the terminal flushing the HARQ buffer storing the uplink data.
  • the flushing of the HARQ buffer affects the DRX operation. This is because the active time in DRX operation is: i) the time during which the DRX related timer (Duration Timer, DRX Inactivity Timer, DRX Retransmission Timer, or MAC Contention Resolution Timer) is in progress, ii) the time when the scheduling request is sent on PUCCH and pending. And iii) an uplink grant for pending HARQ retransmission may occur and may be defined as the time at which data in the corresponding HARQ buffer is present.
  • the DRX related timer Duration Timer, DRX Inactivity Timer, DRX Retransmission Timer, or MAC Contention Resolution Timer
  • the power saving operation may mean that the terminal ends the active time.
  • FIG. 7 is a flowchart illustrating a method of performing a power saving operation of a terminal by a base station according to another embodiment of the present invention.
  • the base station receives power saving related information from the terminal (S700). Operation related to step S700 and its subsequent operations include the spirit and embodiments described in step S400.
  • the base station determines whether to support a power saving operation for the terminal based on the power saving related information (S705).
  • the operation related to step S705 and its subsequent operations include the technical spirit and embodiments described in step S405.
  • the base station determines to support the power saving operation for the terminal, the base station sets the value of the HARQ maximum retransmission (maxHARQ-Tx) field, which is a field indicating that the power saving operation is supported, to 'Infinity'. (S710). That is, the field indicating that the power saving operation is supported may be indicated by a parameter in the maxHARQ-Tx field, which is a field indicating the maximum number of times for uplink retransmission.
  • maxHARQ-Tx HARQ maximum retransmission
  • the surface area of the maxHARQ-Tx field value set to 'infinity' means that the terminal can continue to retransmit as long as the base station requests retransmission.
  • its inherent meaning may include supporting or commanding a power saving operation when receiving a HARQ ACK for uplink transmission from a base station.
  • the UL common channel configuration information (ul-SCH-Config) including the maxHARQ-Tx field set to 'infinity' may be defined as shown in Table 2, for example.
  • the base station transmits uplink common channel configuration information including the maxHARQ-Tx field set to 'infinity' to the terminal (S715).
  • the uplink shared channel configuration information may be included in MAC-Main Config information, which is a kind of RRC message, and transmitted to the terminal. Transmission and configuration of maxHARQ-TX is performed at the RRC layer level, and is completed using the RRC connection reconfiguration procedure.
  • the base station transmits an HARQ ACK for the uplink data received from the terminal to the terminal (S720).
  • the base station transmits an uplink grant (including a new data indicator) to the terminal by the base station for transmitting new uplink data to the base station before step S720, and the uplink grant.
  • the base station may further comprise the step of receiving the uplink data from the terminal by using the uplink resources allocated by the.
  • the HARQ ACK may be mapped to the PHICH and transmitted to the terminal.
  • Receiving only HARQ ACK may mean receiving only HARQ ACK without receiving an uplink grant.
  • the power saving operation may be defined as the following operation.
  • the power saving operation includes the terminal flushing the HARQ buffer storing the uplink data.
  • the flushing of the HARQ buffer affects the DRX operation. This is because the active time in DRX operation is: i) the time during which the DRX related timer (Duration Timer, DRX Inactivity Timer, DRX Retransmission Timer, or MAC Contention Resolution Timer) is in progress, ii) the time when the scheduling request is sent on PUCCH and pending. And iii) an uplink grant for pending HARQ retransmission may occur and may be defined as the time at which data in the corresponding HARQ buffer is present.
  • the DRX related timer Duration Timer, DRX Inactivity Timer, DRX Retransmission Timer, or MAC Contention Resolution Timer
  • the power saving operation may mean that the terminal ends the active time.
  • FIG. 8 is a block diagram illustrating a terminal and a base station according to the first embodiment of the present invention.
  • the terminal 800 includes a receiver 805, a terminal processor 810, and a transmitter 815.
  • the terminal processor 810 again includes an information generator 811 and a HARQ controller 812.
  • the information generator 811 generates power saving related information.
  • the power saving related information is basic data used to determine whether the base station 850 takes power saving operation for the terminal 800.
  • the information generator 811 may determine the necessity of a power saving operation for the terminal 800 before generating power saving related information.
  • the information generation unit 811 may generate power saving related information including a power priority indicator (PPI) indicating that a configuration optimized for power saving of the terminal is preferred.
  • PPI power priority indicator
  • the procedure of transmitting the power priority indicator by the transmitter 815 may be called a terminal auxiliary information transmission procedure.
  • the receiver 805 may first receive a powerPrefIndicationConfig field from the base station 850 including the powerPrefIndication-Enabled field. Through the terminal assistance information transmission procedure, the terminal 800 is allowed to transmit the power priority indicator to the base station 850.
  • the information generator 811 sets the power priority indicator to 'low power consumption', generates terminal assistance information including the power priority indicator, and sends the terminal assistance information to the transmitter 815, and the transmitter 815.
  • the UE may transmit terminal assistance information to the base station 850.
  • the information generator 811 may generate power saving related information including signal strength information about the serving cell of the terminal 800.
  • at least one of reference signal to reception signal (RSRP), reference signal to reception quality (RSRQ), and S-measure may be used as signal strength information on the serving cell of the terminal 800.
  • RSRP reference signal to reception signal
  • RSRQ reference signal to reception quality
  • S-measure may be used as signal strength information on the serving cell of the terminal 800.
  • the reference value of the S-measure is one of main configuration information (or indicators) that can measure the radio link performance between the current serving cell and the terminal 800. For example, if the signal strength information of the serving cell is greater than or equal to the S-measure reference value, the information generator 811 does not perform a signal strength measurement operation on the neighbor cell. On the other hand, when the signal strength information of the serving cell is less than the S-measure reference value, the information generator 811 performs a signal strength measurement operation on the neighbor cell. When the information generating unit 811 generates the result of performing the measurement operation as power saving related information and sends it to the transmitting unit 815, the transmitting unit 815 transmits the power saving related information to the base station 850.
  • the information generator 811 may generate power saving related information for which the transmission is triggered based on the RRM measurement report event.
  • a specific RRM measurement report event for example, event 1A
  • the information generator 811 generates and transmits a measurement report as power saving related information.
  • the transmitter 815 transmits power saving related information to the base station 850.
  • the receiver 805 receives DRX configuration information from the base station 850 including a field indicating that the power saving operation is supported.
  • a field indicating that the power saving operation is supported may be indicated by a DRX_UL-HARQack field.
  • the DRX_UL-HARQack field may be defined as configuration information capable of ending an active time when receiving an HARQ ACK for uplink transmission.
  • DRX configuration information including the DRX_UL-HARQack field may be defined, for example, as shown in Table 1 above.
  • the information generating unit 811 determines that the DRX_UL-HARQack exists in the DRX configuration information
  • the information generating unit 811 configures the DRX_UL-HARQack.
  • the configuration of the DRX_UL-HARQack is performed at the RRC layer level of the terminal 800 and may be completed using an RRC connection reconfiguration procedure.
  • the DRX configuration information is included in the RRC connection reconfiguration message and received by the receiver 805, and the DRX_UL-HARQack configuration corresponds to the RRC connection reconfiguration of the information generator 811.
  • the transmitter 815 transmits uplink data to the base station 850, and the receiver 805 receives a HARQ ACK for the uplink data from the base station 850.
  • the receiver 805 receives an uplink grant (including a new data indicator) from the base station 850 for transmitting new uplink data to the base station 850, and the transmitter 815 receives the uplink grant.
  • the method may further include transmitting the uplink data to the base station 850 using the uplink resource allocated by the.
  • the HARQ controller 812 When the receiver 805 receives the HARQ ACK in a state where the DRX_UL-HARQack is configured, the HARQ controller 812 performs a power saving operation. That is, the power saving operation is a condition that the DRX_UL-HARQack is configured in the terminal 800, and the receiver 805 receives only the HARQ ACK for uplink HARQ data from the base station 850. Receiving only HARQ ACK may mean that the receiver 805 receives only HARQ ACK without receiving an uplink grant.
  • the power saving operation may be defined as the following operation.
  • the power saving operation includes the HARQ control unit 812 flushing the HARQ buffer storing the uplink data.
  • the HARQ buffer is managed by the MAC layer of the terminal 800. Therefore, when the MAC layer receives the HARQ ACK and determines that the DRX_UL-HARQack is configured in the RRC layer, the HARQ controller 812 may flush the HARQ buffer.
  • the flushing of the HARQ buffer affects the DRX operation.
  • the active time is i) the time during which DRX-related timers (durability timer, DRX inactivity timer, DRX retransmission timer or MAC contention resolution timer) are in progress, ii) scheduling request is sent on PUCCH, and pending ), And iii) an uplink grant for pending HARQ retransmission may occur, and may be defined as the time at which data in the corresponding HARQ buffer is present.
  • DRX-related timers durability timer, DRX inactivity timer, DRX retransmission timer or MAC contention resolution timer
  • scheduling request is sent on PUCCH, and pending
  • an uplink grant for pending HARQ retransmission may occur, and may be defined as the time at which data in the corresponding HARQ buffer is present.
  • the power saving operation may mean that the HARQ controller 812 ends the active time.
  • the HARQ control unit 812 performs a DRX operation according to the existing DRX configuration, and the active time does not change. Therefore, the HARQ controller 812 does not flush the HARQ buffer, but keeps the previous uplink data in the HARQ buffer even when the HARQ ACK is received, and does not perform a separate power saving operation. That is, since the activity time in the DRX is not terminated, the HARQ control unit 812 continuously performs PDCCH monitoring.
  • the base station 850 includes a transmitter 855, a base station processor 860, and a receiver 865.
  • the base station processor 860 again includes an information generator 862 and a determiner 861.
  • the receiver 865 receives power saving related information from the terminal 800.
  • the power saving related information is basic data used to determine whether the determination unit 861 takes a power saving operation on the terminal 800.
  • the power saving related information may include a power priority indicator (PPI) indicating that the terminal 800 prefers a configuration optimized for power saving.
  • PPI power priority indicator
  • a procedure of receiving the power priority indicator by the receiver 865 may be used, which may be referred to as a terminal auxiliary information transmission procedure.
  • the present embodiment generates a process in which the information generating unit 862 generates a powerPrefIndicationConfig field including the powerPrefIndication-Enabled field, and the transmitting unit 855 transmits the powerPrefIndicationConfig field to the terminal 800. Include.
  • the power saving related information may include signal strength information about the serving cell of the terminal 800.
  • at least one of reference signal to reception signal (RSRP), reference signal to reception quality (RSRQ), and S-measure may be used as signal strength information on the serving cell of the terminal 800.
  • RSRP reference signal to reception signal
  • RSRQ reference signal to reception quality
  • S-measure may be used as signal strength information on the serving cell of the terminal 800.
  • the power saving related information may be that transmission is triggered based on the RRM measurement report event.
  • a specific RRM measurement report event for example, event 1A
  • the receiver 865 also uses the measurement report as the power saving related information.
  • the determination unit 861 determines whether to support a power saving operation for the terminal 800 based on the power saving related information. As an example, the determination unit 861 may determine whether to support the power saving operation for the terminal 800 that transmits the power priority indicator set as the low power consumption as the power saving related information. As another example, the determination unit 861 may determine whether to support the power saving operation for the terminal 800 in consideration of the signal strength of the serving cell as well as the power priority indicator. For example, the determination unit 861 may determine to support the power saving operation for the terminal 800 having a sufficiently large signal strength for the serving cell. As another example, when the determination unit 861 determines that the radio link performance between the terminal and the base station is degraded later, the determination unit 861 may determine that the terminal 800 supports the power saving operation. .
  • the determination unit 861 may determine to support the power saving operation.
  • the information generation unit 862 may generate DRX configuration information including a field indicating that the power saving operation is supported.
  • the field indicating that the power saving operation is supported may be indicated as a DRX_UL-HARQack field.
  • the DRX_UL-HARQack field may be defined as configuration information capable of ending an active time when receiving an HARQ ACK for uplink transmission.
  • DRX configuration information including the DRX_UL-HARQack field may be defined, for example, as shown in Table 1 above.
  • the information generating unit 862 defines a first DRX Config field (DRX Config_1) that defines the DRX operating parameters for the terminal and a second DRX Config that defines the DRX operating parameters according to inter device coexistance (IDC). Only one of the fields DRX Config_2 may be included in the DRX configuration information. That is, if the information generator 862 includes the first DRX Config field in the DRX configuration information, the information generator 862 may not include the second DRX Config field in the DRX configuration information. In addition, the information generator 862 may not include the first DRX Config field in the DRX configuration information when the second DRX Config field is included in the DRX configuration information.
  • the first DRX Config field may mean, for example, a DRX config corresponding to release version 8 in the LTE system
  • the second DRX Config field may mean a DRX config corresponding to release version 11 in the LTE system, for example. Can be. Even if only the first DRX-config is used for the non-IDC regardless of the release version, the conditional presence for the first DRX-config may be defined in the same manner. Alternatively, the condition existence for the DRX_UL-HARQack field may be defined as one of DRX_1 or DRX_2.
  • the information generator 862 may selectively include the DRX_UL-HARQack field in the DRX configuration information only when the first DRX Config field or the second DRX Config field is included in the DRX configuration information.
  • the information generation unit 862 includes the DRX_UL-HARQack field in the DRX configuration information as shown in Table 1 above.
  • the information generation unit 862 does not include the DRX_UL-HARQack field in Table 1 above.
  • the transmitter 855 transmits the DRX configuration information to the terminal 800.
  • the transmitter 855 transmits the HARQ ACK for the uplink data received from the terminal 800 to the terminal 800.
  • the transmitting unit 855 transmits an uplink grant (including a new data indicator) to the terminal 800 by the receiver 865 to receive new uplink data, and is allocated by the uplink grant.
  • the receiving unit 865 may further include receiving uplink data from the terminal 800 through the uplink resource.
  • the transmitter 855 may map the HARQ ACK to the PHICH and transmit the HARQ ACK to the terminal 800.
  • the transmitter 555 may transmit the HARQ ACK only when the UE 800 configured with the DRX_UL-HARQack is not required to be retransmitted later for the corresponding HARQ process.
  • FIG. 9 is a block diagram illustrating a terminal and a base station according to the second embodiment of the present invention.
  • the terminal 900 includes a receiver 905, a terminal processor 910, and a transmitter 915.
  • the terminal processor 910 again includes an information generator 911 and a HARQ controller 912.
  • the information generator 911 generates power saving related information.
  • the power saving related information is basic data used to determine whether the base station 950 takes a power saving operation on the terminal 900.
  • the information generator 911 may determine the necessity of a power saving operation for the terminal 900 before generating power saving related information.
  • the information generator 911 may generate power saving related information including a power priority indicator (PPI) indicating that a configuration optimized for power saving of the terminal is preferred.
  • PPI power priority indicator
  • the procedure of transmitting the power priority indicator by the transmitter 915 may be called a terminal auxiliary information transmission procedure.
  • the receiving unit 905 may first receive a powerPrefIndicationConfig field from the base station 950 including the powerPrefIndication-Enabled field.
  • the terminal assistance information transmission procedure the terminal 900 is allowed to transmit the power priority indicator to the base station 950.
  • the information generator 911 sets the power priority indicator to 'low power consumption', generates terminal assistance information including the power priority indicator, and sends the terminal assistance information to the transmitter 915. May transmit the terminal assistance information to the base station 950.
  • the information generator 911 may generate power saving related information including signal strength information about the serving cell of the terminal 900.
  • at least one of reference signal to reception signal (RSRP), reference signal to reception quality (RSRQ), and S-measure may be used as signal strength information on the serving cell of the terminal 900.
  • the reference value of the S-measure is one of the main configuration information (or indicator) that can measure the radio link performance between the current serving cell and the terminal 900.
  • the information generator 911 does not perform a signal strength measurement operation on the neighbor cell.
  • the information generator 911 performs a signal strength measurement operation for the neighbor cell.
  • the transmitting unit 915 transmits the power saving related information to the base station 950.
  • the information generator 911 may generate power saving related information for which the transmission is triggered based on the RRM measurement report event.
  • a specific RRM measurement report event for example, event 1A
  • the information generator 911 When transmitting to the unit 915, the transmitter 915 transmits power saving related information to the base station 950.
  • the receiver 905 receives the uplink shared channel configuration information including the maxHARQ-Tx field set to 'infinity' from the base station 950.
  • a field indicating that the power saving operation is supported may be indicated by a HARQ maximum retransmission count (maxHARQ-Tx) field.
  • the UL common channel configuration information (ul-SCH-Config) including the maxHARQ-Tx field set to 'infinity' may be defined as shown in Table 2, for example.
  • the information generator 911 determines that the maxHARQ-Tx field set to 'infinity' exists in the uplink common channel configuration information
  • the information generator 911 configures maxHARQ-Tx.
  • the configuration of maxHARQ-Tx is performed at the RRC layer level of the terminal 900 and may be completed using an RRC connection reconfiguration procedure.
  • the uplink common channel configuration information is included in the RRC connection reconfiguration message and received by the receiver 905, and the maxHARQ-Tx configuration corresponds to the RRC connection reconfiguration of the information generator 911.
  • the transmitter 915 transmits uplink data to the base station 950, and the receiver 905 receives a HARQ ACK for the uplink data from the base station 950.
  • the receiver 905 receives an uplink grant (including a new data indicator) from the base station 950 for transmitting new uplink data to the base station 950, and the transmitter 915 receives the uplink grant.
  • the method may further include transmitting the uplink data to the base station 950 using the uplink resource allocated by the.
  • the HARQ controller 912 When the receiver 905 receives the HARQ ACK in the state where maxHARQ-Tx is configured, the HARQ controller 912 performs a power saving operation. That is, the power saving operation requires that the maxHARQ-Tx be configured in the terminal 900 and that the receiver 905 receives only the HARQ ACK for uplink HARQ data from the base station 950. Receiving only HARQ ACK may mean that the receiver 905 receives only HARQ ACK without receiving an uplink grant.
  • the power saving operation may be defined as the following operation.
  • the power saving operation includes the HARQ control unit 912 flushing the HARQ buffer storing the uplink data.
  • the HARQ buffer is managed by the MAC layer of the terminal 900. Therefore, when the MAC layer receives the HARQ ACK and confirms that maxHARQ-Tx is configured in the RRC layer, the HARQ controller 912 may flush the HARQ buffer.
  • the flushing of the HARQ buffer affects the DRX operation.
  • the active time is i) the time during which DRX-related timers (durability timer, DRX inactivity timer, DRX retransmission timer or MAC contention resolution timer) are in progress, ii) scheduling request is sent on PUCCH, and pending ), And iii) an uplink grant for pending HARQ retransmission may occur, and may be defined as the time at which data in the corresponding HARQ buffer is present.
  • DRX-related timers durability timer, DRX inactivity timer, DRX retransmission timer or MAC contention resolution timer
  • scheduling request is sent on PUCCH, and pending
  • an uplink grant for pending HARQ retransmission may occur, and may be defined as the time at which data in the corresponding HARQ buffer is present.
  • the power saving operation may mean that the HARQ controller 912 ends the active time.
  • the HARQ controller 912 performs a DRX operation according to the existing DRX configuration and does not change an active time. . Therefore, the HARQ control unit 912 keeps previous uplink data in the HARQ buffer without flushing the HARQ buffer even when receiving the HARQ ACK, and does not perform a separate power saving operation. That is, since the activity time in the DRX is not terminated, the HARQ controller 912 continuously performs PDCCH monitoring.
  • the base station 950 includes a transmitter 955, a base station processor 960, and a receiver 965.
  • the base station processor 960 again includes an information generator 962 and a determiner 961.
  • the receiver 965 receives power saving related information from the terminal 900.
  • the power saving related information is basic data used to determine whether the decision unit 961 takes a power saving operation on the terminal 900.
  • the power saving related information may include a power priority indicator (PPI) indicating that the terminal 900 prefers a configuration optimized for power saving.
  • PPI power priority indicator
  • a procedure of receiving the power priority indicator by the receiver 965 may be used, which may be referred to as a terminal auxiliary information transmission procedure.
  • the present embodiment generates a process in which the information generating unit 962 generates a powerPrefIndicationConfig field including a powerPrefIndication-Enabled field, and the transmitting unit 955 transmits the powerPrefIndicationConfig field to the terminal 900. Include.
  • the power saving related information may include signal strength information about the serving cell of the terminal 900.
  • at least one of reference signal to reception signal (RSRP), reference signal to reception quality (RSRQ), and S-measure may be used as signal strength information on the serving cell of the terminal 900.
  • the power saving related information may be that transmission is triggered based on the RRM measurement report event.
  • a specific RRM measurement report event for example, event 1A
  • the receiver 965 uses the measurement report as power saving related information.
  • the determination unit 961 determines whether to support a power saving operation for the terminal 900 based on the power saving related information. As an example, the determination unit 961 may determine whether to support the power saving operation for the terminal 900 that transmits the power priority indicator set as the low power consumption as the power saving related information. As another example, the determination unit 961 may determine whether to support the power saving operation for the terminal 900 in consideration of the signal strength of the serving cell as well as the power priority indicator. For example, for the terminal 900 having a sufficiently large signal strength for the serving cell, the determination unit 961 may determine to support a power saving operation.
  • the determination unit 961 may determine that the terminal 900 supports the power saving operation.
  • the signal strength information of the serving cell has a value equal to or lower than the S-measure reference value or the measurement report by the RRM measurement report event set for radio link performance degradation determination is received from the terminal 900, the corresponding terminal ( In operation 900, the determiner 961 may determine to support a power saving operation.
  • the information generation unit 962 may generate uplink common channel configuration information including a field indicating that the power saving operation is supported. Can be.
  • the field indicating that the power saving operation is supported may be indicated by a maxHARQ-Tx field.
  • the information generator 962 may set the value of the maxHARQ-Tx field to 'infinity' so that the terminal 900 ends the active time when receiving the HARQ ACK for the uplink transmission.
  • the UL common channel configuration information (ul-SCH-Config) including the maxHARQ-Tx field set to 'infinity' may be defined as shown in Table 2, for example.
  • the maxHARQ-TX field can have values n1, n2,... , n24, n28, infinity, and spare1.
  • the value indicating that the power saving operation is supported through the maxHARQ-Tx field is expressed as infinity, but this is merely an example and may be expressed in other terms, and supports the intrinsic meaning or power saving operation. Any term that includes the meaning is included in the technical spirit of the present invention.
  • the information generator 962 generates uplink common channel configuration information including a maxHARQ-Tx field set to 'infinity' and sends it to the transmitter 955.
  • the transmitter 955 transmits uplink common channel configuration information including the maxHARQ-Tx field set to 'infinity' to the terminal 900.
  • the transmitter 955 transmits the HARQ ACK for the uplink data received from the terminal 900 to the terminal 900.
  • the transmitting unit 955 transmits an uplink grant (including a new data indicator) to the terminal 900 by the receiver 965 to receive new uplink data, and is allocated by the uplink grant.
  • the receiving unit 965 may further include receiving uplink data from the terminal 900 through the uplink resource.
  • the transmitter 955 may map the HARQ ACK to the PHICH and transmit the HARQ ACK to the terminal 900.
  • FIG. 10 is an explanatory diagram illustrating a power saving operation based on DRX according to an embodiment of the present invention.
  • DRX configuration information or uplink shared channel configuration information is signaled from the base station to the terminal (S1000).
  • the DRX configuration information includes a DRX_UL-HARQack field that supports the DRX-based power saving operation of the terminal.
  • the terminal configures DRX_UL-HARQack. This is for example shown in Table 1 above.
  • the uplink shared channel configuration information includes a maxHARQ-Tx field set to 'infinity' that supports DRX based power saving operation. This is shown in Table 2, for example.
  • the wireless communication system transmits and receives data based on a structure called a frame on a time axis, and one frame includes 10 subframes.
  • One subframe may also be referred to as a transmission time interval (TTI) and may have a length of 1 ms.
  • TTI transmission time interval
  • the HARQ operation basically transmits or retransmits data in units of HARQ processes. For example, if there are eight HARQ processes, HARQ process # 1 is the same as subframe 0 and subframe 8 of frame 0, subframe 6 of frame 1, subframe 4 of frame 2, ... Data is processed (receive or transmit data) in 8 subframe cycles. That is, the subframes to which each HARQ process number is allocated to process data are different.
  • HARQ process # 6 transmission of the PDCCH to which the UL grant is mapped from the base station to the terminal in subframe 5 of frame 0 is processed by HARQ process # 6 (S1005).
  • the terminal transmits uplink data to the base station using an uplink resource indicated by the uplink grant (S1010), wherein the transmission timing of the uplink data is 4 ms (or 4 subframes) after the subframe receiving the PDCCH.
  • the UE can transmit uplink data to the base station.
  • subframe 3 of frame 1 which is 8 subframes later from the time when the UE receives the PDCCH, is allocated to HARQ process # 6, signaling of HARQ ACK from the base station to the UE is performed by HARQ process # 6 (S1015).
  • the UE In subframe 3 of frame 1, the UE must be in an active time to receive HARQ ACK. Therefore, at this point, the DRX operation of the UE enters the active time.
  • the terminal since the terminal has configured the maxHARQ-Tx set to DRX_UL-HARQack or 'infinity', and has also received the HARQ ACK, the terminal flushes the HARQ buffer and ends the active time (S1020).
  • the terminal does not enter an active time.
  • the base station will not transmit HARQ ACK / NACK in subframe 1 of frame 2, the UE does not need to perform unnecessary PDCCH monitoring.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un appareil et un procédé permettant d'effectuer une opération d'économie d'énergie d'un terminal sur la base d'une réception discontinue. La présente spécification décrit un procédé pour effectuer une opération d'économie d'énergie d'un terminal, comprenant les étapes consistant à : permettre à un terminal de transmettre des informations relatives à une économie d'énergie à une station de base ; et recevoir, à partir de la station de base, des informations de configuration DRX comprenant un champ DRX_UL-HARQack pour prendre en charge une opération d'économie d'énergie basée sur le DRX pour le terminal. Le terminal peut réduire la consommation d'énergie due à la surveillance du PDCCH pendant un temps actif par la résiliation anticipée du temps actif d'un DRX inutile.
PCT/KR2013/009296 2012-11-09 2013-10-17 Appareil et procédé pour effectuer une opération d'économie d'énergie d'un terminal sur la base d'une réception discontinue WO2014073799A1 (fr)

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WO2020135181A1 (fr) * 2018-12-28 2020-07-02 电信科学技术研究院有限公司 Procédé de transmission dci, terminal et dispositif côté réseau
CN111385819A (zh) * 2018-12-28 2020-07-07 电信科学技术研究院有限公司 一种dci的传输方法、终端和网络侧设备
KR20210109024A (ko) * 2019-01-07 2021-09-03 다탕 모바일 커뮤니케이션즈 이큅먼트 코포레이션 리미티드 파워 절약 신호의 전송 방법, 검측 방법 및 기기
KR102470743B1 (ko) * 2019-01-07 2022-11-25 다탕 모바일 커뮤니케이션즈 이큅먼트 코포레이션 리미티드 파워 절약 신호의 전송 방법, 검측 방법 및 기기
US11917544B2 (en) 2019-01-07 2024-02-27 Datang Mobile Communications Equipment Co., Ltd. Energy-saving signal transmission method and detection method, and device
EP3923635A4 (fr) * 2019-02-15 2022-03-02 Huawei Technologies Co., Ltd. Procédés et appareil d'envoi d'informations

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