KR20140080200A

KR20140080200A - Method and apparatus of supporting UE power preference with considering QoS

Info

Publication number: KR20140080200A
Application number: KR1020120149742A
Authority: KR
Inventors: 정명철; 권기범; 안재현
Original assignee: 주식회사 팬택
Priority date: 2012-12-20
Filing date: 2012-12-20
Publication date: 2014-06-30
Also published as: WO2014098409A1

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for supporting power preferences of a terminal considering quality of service (QoS). A UE according to the present invention receives a first RRC connection reconfiguration message including powerPrefIndication-Enabled information for allowing a power preference indicator to be transmitted to a Node B from a base station The terminal generates a Power Preference Indication (PPI) indicating a power preference state of the terminal and a QoS Preference Indication (QPI) indicating a QoS (Quality of Service) preference state of the terminal And transmitting a second RRC connection reconfiguration message including an RRC related parameter reconfigured by the base station based on the power preference indicator and the QoS preference indicator to the base station, And receiving from the base station. According to the present invention, the BS and the UE can adaptively perform RRC-related parameter reconfiguration considering the preference for the QoS of the UE.

Description

[0001] The present invention relates to a method and an apparatus for supporting power preference of a UE considering QoS,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless communication, and more particularly, to a method and apparatus for supporting power preference of a terminal considering quality of service (QoS).

2. Description of the Related Art Due to the development of wireless communication technology, various terminals such as smart phones, tablet PCs (personal computers), and the like that can use various applications without being limited in places are popularized. Accordingly, a variety of applications that have been used on a wired network in the past through a PC or the like are now used in the same way as a wired network on a wireless network rather than a wired network, thereby generating a large amount of traffic. However, in the case of a wireless network such as LTE (Long Term Evolution), since the terminal is designed without sufficiently considering the traffic generation situation due to the use of applications in various terminals, in the terminal performing wireless communication with the base station, Inefficient use of the system.

In addition, in the case of a terminal, it is necessary to operate in consideration of power saving due to a resource condition of a battery or the like. For this purpose, the terminal may use a discontinuous reception (DRX) method or the like. When the DRX scheme is used, the UE can alternately operate in non-active time and active time. Therefore, the terminal or the base station may reduce the battery consumption of the terminal according to the type of application or traffic, or according to the battery saving necessity of the terminal, by making the inactivity time of the DRX method longer. On the other hand, depending on the type of application or traffic, the terminal or the base station may need to maintain the maximum wireless data communication efficiency of the terminal by shortening the inactivity time of the DRX scheme or the like. In order to adaptively configure the radio resources according to the state of the terminal, such as the traffic type or the battery state, a method is required for the terminal and the base station to support the power preference of the terminal. In particular, there is a need for a method by which a terminal and a base station can support power preference of a terminal in consideration of a QoS required according to a service provided to the terminal by the base station.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for supporting power preference of a terminal.

Another aspect of the present invention is to provide a method and apparatus for supporting power preference of a terminal in consideration of QoS.

Another aspect of the present invention is to provide a method and apparatus for performing radio resource configuration / reconfiguration based on whether or not QoS is guaranteed in supporting power preferences of a UE.

Another aspect of the present invention is to provide a structure of a UE Assistant Information message for supporting power preference of a UE in consideration of QoS.

Another aspect of the present invention is to provide an information element (IE) for supporting power preference of a terminal in consideration of QoS.

Another aspect of the present invention is to provide a method and apparatus for configuring Radio Resource Control (RRC) parameters in consideration of QoS in supporting power preferences of a UE.

According to an aspect of the present invention, there is provided a method of supporting power preference of a terminal performed by a terminal. The method includes receiving from a base station a first Radio Resource Control (RRC) Connection Reconfiguration message including powerPrefIndication-Enabled information that permits transmission of a power preference indicator to a base station , A power preference indicator (PPI) indicating a power preference state of the terminal, and a QoS preference indicator (QPI) indicating a quality of service (QoS) preference state of the terminal Receiving a second RRC connection reconfiguration message from the base station, the RRC connection reconfiguration message including an RRC related parameter reconfigured by the base station based on the power preference indicator and the QoS preference indicator; The method comprising the steps of:

According to another aspect of the present invention, there is provided a method of supporting power preference of a terminal performed by a base station. The method includes transmitting a first RRC connection reconfiguration message to the terminal, the first RRC connection reconfiguration message including power preference indicator-enabling information that allows the power preference indicator to be transmitted to the base station, the power preference indicator indicating the power preference indicator of the terminal, Receiving a terminal ancillary information message including a QoS preference indicator indicating a QoS preference state of the terminal from the terminal, reconstructing an RRC-related parameter based on the power preference indicator and the QoS preference indicator, And transmitting a second RRC connection reconfiguration message including the RRC related parameters to the UE.

According to another aspect of the present invention, there is provided a terminal supporting power preference. The terminal includes a receiver for receiving from the base station a first RRC connection reconfiguration message including power preference indicator-enable information that allows the UE to transmit a power preference indicator to the base station, a power preference indicator and a QoS preference status A message processor for generating a terminal ancillary information message including a power preference indicator indicating a state of power preference and a QoS preference indicator indicating a QoS preference state; Wherein the receiver receives a second RRC connection reconfiguration message including the RRC related parameters reconfigured by the base station based on the power preference indicator and the QoS preference indicator from the base station.

According to another aspect of the present invention, there is provided a base station supporting power preference of a terminal. Wherein the base station transmits a first RRC connection reconfiguration message including power preference indicator-enabling information that allows the base station to transmit a power preference indicator to the base station, a power preference indicator indicating a power preference state of the terminal, A parameter change unit for reconfiguring an RRC related parameter based on the power preference indicator and the QoS preference indicator, a receiving unit for receiving a terminal ancillary information message including an indicator and a QoS preference indicator indicating a QoS preference state of the terminal, And a message processor for generating a second RRC connection reconfiguration message including the reconfigured RRC related parameters, wherein the transmitter transmits the generated second RRC reconfiguration message to the UE.

According to the present invention, not only can the base station reconfigure the RRC related parameters based on the power preference of the UE, informing the UE of the RRC related parameters, the UE can inform the base station of its preference for QoS, , And adaptive RRC-related parameter reconfiguration can be performed. That is, the base station can support the terminal power preference in consideration of the preference of the terminal for QoS guarantee.

In addition, when the necessity of power saving is large in the terminal and the necessity of QoS satisfaction is not large, the base station restricts or does not support the QoS support for the service provided to the terminal for power saving, The efficiency can be increased.

1 shows a wireless communication system to which the present invention is applied.
2 shows a structure of a subframe to which the present invention is applied.
3 is a flowchart illustrating a procedure for transmitting a power preference indicator of a terminal according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a procedure for supporting power preference of a terminal according to an exemplary embodiment of the present invention.
5 is a conceptual diagram illustrating a DRX operation according to an exemplary embodiment of the present invention.
6 illustrates a structure of a bearer service in a wireless communication system to which the present invention is applied.
FIG. 7 is a flowchart illustrating a procedure for supporting power preferences of a terminal in consideration of QoS according to the present invention.
8 is a flowchart illustrating a method for supporting power preference of a terminal by a terminal according to an exemplary embodiment of the present invention.
9 is a flowchart illustrating a method of supporting power preference of a terminal by a base station according to an exemplary embodiment of the present invention.
10 is a block diagram illustrating a terminal and a base station supporting power preferences of other terminals according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known configurations or functions will be omitted if it is determined that the gist of the present specification may be obscured.

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal connected to the network.

1 shows a wireless communication system to which the present invention is applied.

Referring to FIG. 1, a wireless communication system 10 is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system 10 includes at least one base station 11 (evolved-NodeB, eNB). Each base station 11 provides communication services to specific cells (15a, 15b, 15c). The cell may again be divided into multiple regions (referred to as sectors). The base station 11 may be referred to as another term such as a base station (BS), a base transceiver system (BTS), an access point, a femto base station, a home node B, and a relay. Cells are meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, and femtocell.

A user equipment (UE) 12 may be fixed or mobile and may be a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, (personal digital assistant), a wireless modem, a handheld device, and the like.

Hereinafter, the downlink refers to a transmission link from the base station 11 to the terminal 12, and the uplink refers to a transmission link from the terminal 12 to the base station 11 it means. In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12. In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11. There are no restrictions on multiple access schemes applied to wireless communication systems. (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like. A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

2 shows a structure of a subframe to which the present invention is applied.

Referring to FIG. 2, one radio frame includes ten subframes, and one subframe includes two consecutive slots. The first 1, 2, 3 or 4 OFDM symbols preceding the first slot in the subframe are control regions to which PDCCHs are mapped, and the remaining OFDM symbols are mapped to physical downlink shared channels (PDSCHs) (Data region). Control channels such as PCFICH and PHICH may be allocated to the control area in addition to the PDCCH. The UE can decode the PDCCH and read the data information transmitted on the PDSCH.

The UE transmits a PDCCH based on a cell-radio network temporary identifier (C-RNTI), a transmission power control (PPC) -PUCCH-RNTI, a TPC-PUSCH-RNTI and an SPS (Semi Persistent Scheduling) Monitoring can be performed. The monitoring of the PDCCH can be controlled by a discontinuous reception (DRX) operation, and the parameter related to the DRX is transmitted to the terminal by the RRC message. The UE must always receive system information (SI) -RNTI, P (Paging) -RNTI, etc. in addition to the RNTIs regardless of the DRX operation configured by the RRC message. Here, the remaining PDCCHs other than the PDCCH scrambled with the C-RNTI are always received through the common search space of the main serving cell.

If the DRX parameter is configured in the RRC connected state, the UE performs discontinuous monitoring on the PDCCH based on the DRX operation. On the other hand, if the DRX parameter is not configured, the UE performs continuous PDCCH monitoring. Discontinuous PDCCH monitoring means that the UE monitors the PDCCH only in a specific subframe, and continuous PDCCH monitoring means that the UE monitors the PDCCH in all subframes. On the other hand, when PDCCH monitoring is required in a DRX-independent operation such as a random access procedure, the UE monitors the PDCCH according to the requirements of the corresponding operation.

The terminal must operate in consideration of power saving due to a lease situation such as a limited battery. For this, the terminal can use the DRX scheme or the like. When the DRX scheme is used, the UE can alternately operate in non-active time and active time. Therefore, the terminal or the base station may reduce the battery consumption of the terminal according to the type of application or traffic, or according to the battery saving necessity of the terminal, by making the inactivity time of the DRX method longer. On the other hand, depending on the type of application or traffic, the terminal or the base station may need to maintain the maximum wireless data communication efficiency of the terminal by shortening the inactivity time of the DRX scheme or the like. In order to adaptively configure the radio resources according to the state of the terminal, such as the traffic type or the battery state, a method of reflecting information on the preferred mode of the terminal between the terminal and the base station is required.

3 is a flowchart illustrating a procedure for transmitting a power preference indicator of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the BS transmits an RRC Connection Reconfiguration message to the MS (S300). The RRC connection reconfiguration message includes powerPrefIndication-Enabled information and powerFrefIndication-Timer information. The power preference indicator-enabling information is information allowing or permitting a terminal capable of transmitting a power preference indicator (PPI) to transmit the power preference indicator to the base station. The power preference indicator-timer information includes time information regarding the PPI prohibition timer. The PPI inhibition timer may indicate a minimum time interval (MTI) for the MS to transmit the power preference indicator. For example, the terminal sets a PPI inhibition timer based on the power preference indicator-timer, activates the PPI inhibition timer when the terminal transmits a power preference indicator to the base station, and again during the time the PPI inhibit timer operates The power preference information of the terminal is not transmitted.

The UE transmits a UE assistance information message to the BS (S310). The terminal assistance information message includes the power preference indicator. The terminal assistance information message is an RRC dedicated message.

The terminal may receive the power preference indicator-enable information and transmit the power preference indicator to the base station by including the power preference indicator in the terminal assistance information. For example, the terminal may receive power preference indicator-enable information from the base station and transmit a power preference indicator to the base station if the PPI inhibit timer is not in operation. For example, the UE may transmit a power preference indicator to the BS when it has not transmitted the power preference indicator to the BS after the connection to the current serving cell. In another example, the terminal may transmit a power preference indicator to the base station when the power preference state information finally transmitted to the base station is changed. As another example, the terminal may transmit the power preference indicator to the base station immediately when the PPI prohibition timer expires.

Where the power preference indicator indicates the power preference state of the terminal. The power preference state of the terminal as indicated by the power preference indicator includes, for example, a normal state and a low power consumption state.

The normal state indicates that the terminal has no particular preference. The normal state may indicate a state in which the terminal basically maintains a resource, a radio resource, a power consumption state, a DRX state, or the like set in the network. In addition, the normal state can indicate a state in which the current setting is maintained as it is without special consideration of the traffic characteristics and the like. That is, the terminal in the normal state can be regarded as a state maintaining a basic state without any particular preferred configuration. In addition, the normal state may be a state having a relatively high transmission efficiency as compared with a low power consumption state described later. For example, even if the battery consumption increases somewhat depending on the application or the like used by the terminal, it can be considered that the state requires a setting related to the base station in consideration of the transmission efficiency.

The low power consumption state indicates that the terminal prefers low battery consumption. In other words, the low power consumption state can be regarded as a state requiring the base station to make a related setting so that the terminal can reduce battery consumption more than the current battery consumption state in order to minimize battery consumption. In this case, the base station can reconstruct the related configuration so that the terminal can reduce battery consumption based on the information on the low power consumption state.

The BS may perform RRC-related parameter reconfiguration or the like by reflecting the power preference state of the UE indicated by the power preference indicator of the UE. Of course, the power preference of the UE is a reference to consider when the BS configures the radio resources, and the BS may perform the RRC-related parameter reconfiguration in contrast to the power preference of the UE. The RRC related parameters to be reconstructed mainly include radio resource allocation and the DRX parameters, but are not limited thereto.

4 is a flowchart illustrating a procedure for supporting power preference of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 4, steps S400 and S410 are the same as those in S300 and S310 of FIG. 3, and thus detailed description thereof will be omitted.

The base station reconfigures RRC-related parameters, for example DRX-related parameters, based on the power preference indicator of the UE included in the terminal assistance information message received in S410, and transmits an RRC connection reconfiguration message including the parameters to the UE S420). Modification or reconfiguration of RRC-related parameters includes radio resource configuration or radio resource reconfiguration.

Here, DRX refers to a function that allows the UE to stop monitoring the physical downlink control channel (PDCCH) for a predetermined period (e.g., non-active time) , The UE repeats the active time and the non-active time with a predetermined periodicity in the DRX mode. The activity means that the UE monitors the PDCCH. Inactivity means that the terminal stops monitoring the PDCCH.

The DRX may be configured by radio resource control / media access control (RRC / MAC). Related DRX parameters may include a long DRX cycle, a DRX inactivity timer, and a DRX retransmission timer. Also optionally, DRX includes a short DRX cycle and a DRX short cycle timer (drxShortCycleTimer). The long DRX cycle provides a longer inactivity time for the terminal than the short DRX cycle.

5 is a conceptual diagram illustrating a DRX operation according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the DRX operation is repeated in a DRX cycle (500). The DRX cycle 500 is a periodic repetition of a DRX opportunity (DRX) 510 and an On Duration Is defined. That is, a DRX cycle 500 of one cycle includes a duration 505 and an opportunity for DRX 510. [ The DRX cycle 500 is, for example, a long DRX cycle applied in a range between 10 subframes and 2560 subframes, and as another example, a short DRX cycle short applied in the range of 2 subframes to 640 subframes DRX cycle). At this time, the short DRX cycle is applied only while the DRX short cycle timer (drxShortCycleTimer) is operating, and the long DRX cycle is applied in the range outside the DRX short cycle timer. Here, the DRX short-cycle timer is one basic DRX cycle. At this time, the length of the short-term DRX cycle timer may be 1 to 16, for example. Term DRX mode when the terminal is operating in the short-term DRX cycle, or a long-term DRX mode when operating in the long-term DRX cycle.

The RRC layer manages several timers to control the DRX operation. The timer for controlling the DRX operation includes a duration timer (onDurationTimer), a DRX Inactivity Timer (DRX Inactivity Timer), and a DRX Retransmission Timer (DRX Retransmission Timer).

The duration timer is started by the start of the DRX cycle. That is, the start time of the sustain interval timer coincides with the start time of the DRX cycle. The duration timer increases by 1 for every PDCCH subframe. And the duration timer expires when the duration timer value equals a preconfigured expiration value. The sustain interval timer is valid until the sustain interval timer value becomes equal to the expiration value.

The DRX inactivity timer may be defined as the number of consecutive PDCCH subframes from the point in time at which the PDCCH for uplink or downlink user data transmission is successfully decoded. It is time for the UE to continuously monitor the PDCCH since continuous data reception may occur. The DRX inactivity timer is started or restarted when the UE successfully decodes the PDCCH for the HARQ initial transmission in the PDCCH subframe.

The DRX Retransmission Timer is a timer that operates based on the maximum number of consecutive numbers of PDCCH subframes expected to be DL retransmitted by the UE. The DRX retransmission timer is a timer that is started when the HARQ RTT timer has expired but fails to receive the retransmission data. The UE can monitor reception of data retransmitted in the HARQ process while the DRX retransmission timer is in progress. The configuration of the DRX Retransmission Timer is defined by the MAC-MainConfig message of the RRC layer.

The duration of the duration timer, DRX inactivity timer, or DRX retransmission timer is referred to as active time. Or the activity time may refer to all the intervals that the terminal is awake. The non-active time in the DRX cycle 500 may be referred to as a non-active time. The activity time may be referred to as a wake up period, and the inactivity time may be referred to as a sleep period. The terminal monitors the PDCCH for the PDCCH subframe (PDCCH subframe) during the active time. Here, the PDCCH subframe means a subframe including a PDCCH. For example, in a TDD configuration, downlink subframes and downlink pilot time slot (DwPTS) subframes correspond to a PDCCH subframe. A timer unit of a DRX timer such as a duration timer, a DRX inactivity timer, or a DRX retransmission timer is a PDCCH subframe (psf). That is, the DRX timers are counted based on the number of PDCCH subframes.

In addition, there are a long DRX cycle (longDRX-Cycle) and a DRX start offset (drxStartOffset) as parameters for controlling the DRX operation. The base station optionally sets a DRX short cycle timer (drxShortCycleTimer) and a short DRX- . In addition, a HARQ round trip time (RTT) timer is defined for each downlink HARQ process.

The DRX start offset is a value defining the subframe in which the DRX cycle 500 begins. The DRX short cycle timer is a timer that defines the number of consecutive subframes for which the UE must follow a short DRX cycle. The HARQ RTT timer is a timer that defines the minimum number of subframes prior to an interval in which a UE is expected to receive a downlink HARQ retransmission.

Meanwhile, the DRX configuration information may be received in a MAC-MainConfig message, which is an RRC message used to specify a main configuration of a MAC layer for a signaling radio bearer (SRB) and a data radio bearer (DRB). The DRX configuration information can be configured, for example, as shown in the following table.

DRX-Config :: = CHOICE {
release NULL,
setup SEQUENCE {
onDurationTimer ENUMERATED {
pSF1, pSF2, pSF3, pSF4, pSF5, pSF6,
psf8, psf10, psf20, psf30, psf40,
psf50, psf60, psf80, psf100, psf200},
DRx-InactivityTimer ENUMERATED {
pSF1, pSF2, pSF3, pSF4, pSF5, pSF6,
psf8, psf10, psf20, psf30, psf40,
psf50, psf60, psf80, psf100,
psf200, psf300, psf500, psf750,
psf1280, psf1920, psf2560, psf0-v1020,
spare9, spare8, spare7, spare6,
spare5, spare4, spare3, spare2,
spare1},
DRx-RetransmissionTimer ENUMERATED {
psf1, psf2, psf4, psf6, psf8, psf16,
psf24, psf33},
longDRX-CycleStartOffset CHOICE {
sf10 INTEGER (0..9),
sf20 INTEGER (0..19),
sf32 INTEGER (0..31),
sf40 INTEGER (0..39),
sf64 INTEGER (0..63),
sf80 INTEGER (0..79),
sf128 INTEGER (0..127),
sf160 INTEGER (0..159),
sf256 INTEGER (0..255),
sf320 INTEGER (0..319),
sf512 INTEGER (0..511),
sf640 INTEGER (0..639),
sf1024 INTEGER (0..1023),
sf1280 INTEGER (0..1279),
sf2048 INTEGER (0..2047),
sf2560 INTEGER (0..2559)
},
shortDRX SEQUENCE {
shortDRX-Cycle ENUMERATED {
sf2, sf5, sf8, sf10, sf16, sf20,
sf32, sf40, sf64, sf80, sf128, sf160,
sf256, sf320, sf512, sf640},
drxShortCycleTimer INTEGER (1..16)
} OPTIONAL - Need OR
}
}

Referring to Table 1, the DRX configuration information includes an onDurationTimer field for defining a value of a duration timer, a drx-InactivityTimer field indicating a value of the DRX inactivity timer, and a drx-RetransmissionTimer field indicating a value of the DRX retransmission timer do. The DRX configuration information also includes a longDRX-CycleStartOffset field indicating the length of the long DRX cycle and a starting subframe, and a shortDRX field related to the short-term DRX that can be optionally configured. The shortDRX field specifically includes a shortDRX-Cycle subfield that indicates the length of the short DRX cycle and a drxShortCycleTimer subfield that indicates the value of the short-term DRX cycle timer that the terminal consecutive.

The onDurationTimer field may be set to any one of the values of {psf1, psf2, psf3, ... psf200}. psf denotes a PDCCH subframe, and the number after psf denotes the number of PDCCH subframes. That is, psf represents the expiration value of the timer as the number of PDCCH subframes. For example, if the onDurationTimer field = psf1, the duration timer expires after progressing cumulatively to one PDCCH subframe including the subframe where the DRX cycle started. Or the onDurationTimer field = psf4, the duration timer expires after progressing from the beginning of the DRX cycle cumulatively to the four PDCCH subframes. The drx-InactivityTimer field may be set to any one of the values of {psf1, psf2, psf3, ... psf2560}. For example, if the drx-InactivityTimer field = psf3, the DRX inactivity timer expires after progressing up to three PDCCH subframes cumulatively, including the subframe at the time of driving. The drx-RetransmissionTimer field may be set to one of the values of {psf1, psf2, psf4, ... psf33}. For example, if the drx-RetransmissionTimer field = psf4, the DRX Retransmission Timer expires after progressing up to four PDCCH subframes cumulatively including the subframe at the time of being driven.

The longDRX-CycleStartOffset field may be set to one of the values of {sf10, sf20, sf32, sf40, ... sf2560} as the length of the long DRX cycle, and the subframe at which the long DRX cycle starts is the length of the long DRX cycle INTEGER (0..39), ... INTEGER (0..2559)} values corresponding to the values of the values of [ For example, if the longDRX-CycleStartOffset field = sf20, INTEGER (0..19), then one long DRX cycle includes 20 subframes, and the long DRX cycle may be any subframe Can be selected as the long-term DRX cycle start sub-frame. The shortDRX-Cycle subfield constituting the shortDRX field may be set to any one of the values of {sf2, sf5, sf8, ... sf640}. For example, if the shortDRX-Cycle subfield = sf5, then one short DRX cycle includes five subframes. In addition, the drxShortCycleTimer subfield constituting the shortDRX field may represent any one of the integers 1 to 16. For example, if the drxShortCycleTimer subfield = 3, the short DRX cycle expires three times.

Referring again to FIG. 4, in step S420, the RRC-related parameter reconstruction based on the UE preference information, and the reconfiguration of the RRC-related parameters in the case of reconfiguring the DRX-related parameters, in particular, the DRX-related parameters, have.

For example, the base station can maintain the previously configured RRC-related parameters when the power preference indicator indicates a normal state. Therefore, in this case, S420 may be omitted. Or if the power preference indicator indicates a normal state, the base station may reconfigure the RRC related parameters so as to increase transmission efficiency. For example, the base station can perform DRX reconfiguration to add a short-term DRX configuration to the UE by reflecting the normal condition if only the long-term DRX is configured in the UE and the short-term DRX is not configured. (N = x or n < x: n is the number of DRX subframes, x is the number of subframes of a certain size or more), or the number of subframes n applied to one cycle of the long DRX or short- Number). Alternatively, the base station may reconfigure the persistent interval timer for more than a predetermined time (onDurationTimer = y or onDurationTimer> y). In addition, the base station may reconfigure the DRX inactivity timer and the DRX retransmission timer, for example, over a certain period of time. Alternatively, the base station may reconfigure the number of subframes (n) applied to one cycle of the DRX to a value shorter than the existing one, and reconfigure the duration timer to be one step longer than the existing one. The base station may also reconfigure the DRX inactivity timer and the DRX retransmission timer to a value that is one step longer than the conventional one. In this case, the active time for the UE to monitor the PDCCH subframe occurs more frequently or becomes longer, and the downlink transmission efficiency can be improved as compared with the case of the low power consumption state described later.

Specifically, for example, in the case where the onDurationTimer field = psf10 and the longDRX-CycleStartOffset field = sf40 and INTEGER (0..39) in Table 1, the base station determines the power of the terminal based on the power- If the preference state is found to be in the normal state, the base station may reconfigure to the onDurationTimer field = psf20. The base station can also be reconfigured with the longDRX-CycleStartOffset field = sf32, INTEGER (0..31). The base station may also reconfigure the onDurationTimer field = psf20 and the longDRX-CycleStartOffset field = sf32, INTEGER (0..31) at the same time. In the case of the above method, since the DRX cycle length is reduced, the UE can operate more frequently at the active time, and the UE can operate for a longer period of time due to an increase in the duration timer , The transmission efficiency can be improved as compared with the case of the low power consumption state described later.

In general, when the power preference indicator indicates the normal state, the BS can give more scheduling opportunities in units of time for the UE, thereby ensuring sufficient QoS to the UE. Or the base station may support QoS with a relatively shorter packet delay budget. This will be described later.

As another example, if the power preference indicator indicates a low power consumption state, the base station can perform RRC related parameter reconfiguration in a configuration that can reduce battery consumption of the terminal. For example, the base station may reconfigure (or configure) the DRX to allow the terminal to operate in long DRX mode. Or reconfigure DRX so that the inactivity time of the terminal is kept longer. In this case, the base station can perform DRX reconfiguration such that the terminal does not operate in the short term DRX mode but operates in the long term DRX mode. That is, when both the short DRX and the long DRX are configured in the DRX setting, and the base station receives the power preference indicator indicating the low power consumption state from the terminal, the base station can remove the short term DRX configuration. (N = x or n > x: n is the number of DRX subframes, x is the number of subframes of a certain size or more), or the number of subframes n applied to one cycle of the long DRX or short- Number). &Lt; / RTI > In addition, the base station may reconfigure the duration timer to a constant time (y) or less (onDurationTimer = y or onDurationTimer <y). In addition, the base station may reconfigure the DRX inactivity timer and the DRX retransmission timer to a predetermined time or less. Alternatively, the base station may reconfigure the number of subframes (n) applied to one cycle of the DRX to a longer value than the existing one, and reconfigure the duration timer to a shorter value than the existing one. The base station may also reconfigure the DRX inactivity timer and DRX retransmission timer to a shorter value than before. Here, if the number of subframes applied in one DRX cycle increases, the cycle of monitoring the PDCCH by the UE becomes longer, so that power consumption of the UE can be reduced. Also, since the duration timer, the DRX inactivity timer, and the DRX retransmission timer are related to the number of PDCCH subframes received, when the time is reconfigured to a shorter time, the power saving of the UE is effective. .

Specifically, for example, in the case where the onDurationTimer field = psf10 and the longDRX-CycleStartOffset field = sf40 and INTEGER (0..39) in Table 1, the base station transmits the power preference information When it is found that the power consumption state, the base station can reconstruct the onDurationTimer field = psf8. The base station can also be reconfigured with the longDRX-CycleStartOffset field = sf64, INTEGER (0..63). The base station may also reconfigure the onDurationTimer field = psf8 and the longDRX-CycleStartOffset field = sf64, INTEGER (0..63) at the same time. In the case of the above method, the UE can operate more intermittently at the active time due to the increase of the DRX cycle length, and the UE can operate at the active time for a shorter time due to the decrease of the duration timer , The terminal can reduce power consumption.

As described above, the terminal transmits the power preference information of the terminal to the base station, and the base station can reconfigure the RRC-related parameters in the terminal in consideration of the power preference state of the terminal based on the power preference information. However, when the UE performs the RRC-related parameter reconfiguration according to the transmitted power preference information, the base station may not be able to satisfy QoS requested by the service provided to the UE. For example, if the UE's power preference state is in a low power consumption state, or if the base station reconfigures RRC-related parameters based on the low power consumption state, the base station reconfigures (or configures) DRX to operate in long DRX mode, do or. Or the DRX is reconfigured (or configured) so that the inactivity time of the terminal is maintained longer, it may be difficult to satisfy the QoS for the service provided to the terminal by the base station due to scheduling delay or the like.

In general, a base station manages QoS through QCI mapping for a bearer. In a wireless communication system to which the present invention is applied, the bearer can be configured as follows.

6 illustrates a structure of a bearer service in a wireless communication system to which the present invention is applied.

Referring to FIG. 6, a bearer provided by the wireless communication system is collectively referred to as an evolved packet system (EPS) bearer. The EPS bearer is a transmission path generated between the terminal and the P-GW.

EPS bearer types have a default bearer and a dedicated bearer. When a terminal accesses a wireless communication network, an IP address is allocated, a PDN connection is created, and a default EPS bearer is simultaneously created. That is, the default bearer is created the first time a new PDN connection is created. The default bearer is maintained until the PDN connection is terminated. If a user uses a service (eg, the Internet) via a default bearer and uses a service (eg, VoD, etc.) that is not properly provided with QoS as the default bearer, A dedicated bearer is created. In this case, the dedicated bearer can be set to a different QoS from the bearer that has already been set. The QoS parameters applied to the dedicated bearer are provided by the Policy and Charging Rule Function (PCRF). When generating the dedicated bearer, the PCRF can determine the QoS parameters by receiving the subscription information of the user from the Subscriber Profile Repository (SPR). Up to 15 dedicated bearers can be created, for example, up to 15, and in the current LTE system no four of the 15 are used. Therefore, up to 11 dedicated bearers can be created.

The EPS bearer includes a QoS Class Identifier (QCI) and an Allocation and Retention Priority (ARP) as basic QoS parameters. QCI is a scalar used as a criterion for accessing node-specific parameters that control bearer level packet forwarding treatment, where the scalar value is used by an operator that owns the base station And is pre-configured. For example, the scalar may be pre-configured with any one of the integer values 1-9. The main purpose of ARP is to determine if the establishment / modification request of the bearer is accepted or needed to be rejected if resources are limited. ARP may also be used to determine which bearer (s) to drop by the base station during exceptional resource limitations, such as at handover.

The EPS bearer is divided into a guaranteed bit rate (GBR) type bearer and a non-GBR type bearer. The default bearer is always a non-GBR bearer, and the dedicated bearer may be a GBR or non-GBR bearer.

In addition to QCI and ARP, GBR type bearers are further associated with Guaranteed Bit Rate (GBR) and Maximum Bit Rate (MBR) as QoS parameters. The GBR denote the bit rate that can be expected to be provided by the EPS bearer. The MBR limits the bit rate that can be expected to be provided by the EPS bearer. In other words, GBR can indicate information about the bit rate to be guaranteed at least, and the MBR can indicate information on the maximum bit rate tolerance to prevent excessive use of resources when the bit rate or more guaranteed by GBR is allowable. That is, the GBR type bearer may mean that a fixed resource is allocated to each bearer (bandwidth guarantee).

On the other hand, non-GBR type bearers are more related to AMBR (Aggregated Maximum Bit Rate) as QoS parameters in addition to QCI and ARP, Which means that bandwidth is allocated. In other words, the AMBR can define an aggrregate bit rate that can be expected to be provided for non-GBR bearers. That is, the AMBR can indicate information on the maximum bandwidth that can be allocated for the non-GBR bearer.

The P-GW (Packet Gateway) is a network node connecting between a wireless communication network (e.g., LTE network) and another network according to the present invention. The EPS bearer is defined between the terminal and the P-GW. The EPS bearer is further subdivided between nodes, and is defined as an RB between the UE and the base station, an S1 bearer between the base station and the S-GW, and an S5 / S8 bearer between the S-GW and the P- do. Each bearer is defined via QoS. QoS is defined through data rate, error rate, delay, and the like.

Therefore, once the QoS that the wireless communication system should provide as a whole is defined as the EPS bearer, QoS is determined for each interface. Each interface establishes a bearer according to the QoS it should provide.

The bearer of each interface provides the QoS of the entire EPS bearer divided by interface, so that the EPS bearer, the RB, and the S1 bearer all have a one-to-one relationship.

Table 2 shows the QCI tables showing the characteristics according to the QoS classes. The base station can allocate and verify the QCI in the bearer establishment or modification procedure.

Referring to Table 2, the packet delay budget (PDB) represents the upper bound of the allowable delay time in the corresponding QCI, and the PELR represents the allowable packet error loss rate Represents the upper limit.

The QoS assigned to the bearer is managed by QCI and managed according to the respective characteristics of QCI indices 1 to 9. For example, bearers with QoS corresponding to QCI indexes 6, 8, and 9 have a packet delay budget of 300 ms, which is used for a relatively large service, and a resource type corresponding to non-GBR. The bearers with QoS corresponding to QCI index 4 have a packet delay budget of 300 ms, which is set to a relatively large value, but the resource type has a characteristic corresponding to GBR.

As described above, in the current wireless communication system, the base station must be able to support the QoS requested by the corresponding service in providing the service to the terminal. This is also true when the base station receives the power preference information from the terminal and performs RRC-related parameter reconfiguration based on the power preference state of the terminal. Therefore, when the power preference state of the UE is in a low power consumption state and the need for battery saving is great in the UE, or when the packet delay budget is relatively small, such as when the QCI index for the service provided to the UE is 5, The RRC-related parameter reconfiguration may not be performed in consideration of the low power consumption state of the UE. This is because the base station needs to provide and maintain the QoS to be provided to the terminal. However, in a specific case, for example, the terminal restricts QoS support for a service provided to a terminal by a base station for power saving, or does not support QoS support for a service provided to a terminal in a case where power saving is necessary in a terminal, There is a need to allow it not to. For example, the terminal may be in a temporary battery condition or in a limited power situation, and the terminal may grasp the situation and allow continuous or temporary restriction of the QoS for power saving. However, in the current wireless communication system, the base station can only confirm the power preference state of the terminal through the power preference information provided by the terminal, and can determine whether the terminal permits a certain degree of QoS or, in a specific case, Whether to request the base station to ignore the QoS requested by the corresponding QCI, or the like, can not be confirmed by the base station. Accordingly, in supporting the terminal power preference at the base station and the terminal, a method of considering the preference of the terminal with respect to the QoS for the service provided to the terminal by the base station is required.

Hereinafter, the terminal power preference supporting procedure considering the QoS according to the present invention can be performed as follows.

FIG. 7 is a flowchart illustrating a procedure for supporting power preferences of a terminal in consideration of QoS according to the present invention.

Referring to FIG. 7, the BS transmits an RRC connection reconfiguration message to the MS (S700). The RRC connection reconfiguration message includes power preference indicator-capable information and power preference indicator-timer information. The power preference indicator-enabling information is information that permits or permits a terminal capable of transmitting the power preference indicator to transmit the power preference indicator to the base station. The power preference indicator-timer information includes time information regarding the power preference indicator inhibition timer. The PPI inhibition timer may indicate a minimum interval time for the UE to transmit the power preference indicator.

The terminal transmits the terminal assistance information message to the base station (S710). The terminal assistance information message includes a power preference indicator. The terminal assistance information message is an RRC dedicated message. In addition, the terminal assistance information message may include a QoS preference indicator (QPI). The QoS preference indicator may be included with the power preference indicator if the terminal assistance information message includes the power preference indicator, or the QoS preference indicator may be included in the power preference indicator if the power preference state of the terminal indicated by the power preference indicator is & And may be selectively included only in the power consumption state. The QoS preference indicator indicates the preference of the UE for QoS, and the BS can reconfigure the RRC-related parameters in the UE in consideration of both the power preference indicator and the QoS preference indicator. The QoS preference indicator may be referred to as QoS information (QoSinfo), QoS priority information (QoSPriorityInfo), or QoS hold (QoSHold).

In one example, the QoS preference indicator may instruct the packet delay budget to guarantee the QoS of the bearer corresponding to a QCI below (or below) a certain level. In other words, if the packet delay budget of the QCI for the bearer is less than (or less than) a certain level, the base station may determine, based on the QoS preference indicator, The RRC-related parameters may not be reconfigured according to the power consumption state. Specifically, for example, if the QoS preference indicator indicates a suuport or a value 1, a QCI index 1 that does not correspond to QCI indices 4, 6, 8, and 9 with a packet delay budget of 300 ms or more for the bearer , 2, 3, 5, and 7, it can be understood that the packet delay budget is smaller than 300 ms, and the BS does not reconfigure RRC-related parameters based on the low power consumption state to guarantee QoS to the UE, Based RRC-related parameter reconfiguration. Also, if the QoS preference indicator indicates nosupport or a value of 0, the base station can perform RRC-related parameter reconstruction based on the low power consumption state regardless of the QCI packet delay budget for the bearer. For example, RRC-related parameter reconfiguration based on the low power consumption state can be performed even though there is a bearer corresponding to QCI indexes 1, 2, 3, 5, and 7 with a packet delay of 300 ms or less for the bearer. At this time, when the base station performs the RRC parameter reconfiguration based on the low power consumption state, the QoS for the QCI indices 1, 2, 3, 5, and 7 may not be guaranteed. However, in this case, the UE determines that priority is given to low power consumption rather than QoS guarantee, and can perform the RRC parameter reconfiguration.

In another example, the QoS preference indicator may instruct QoS of the bearer corresponding to the QCI whose resource type is GBR. In other words, if the resource type of the QCI for the bearer is GBR, the base station can guarantee QoS to perform RRC-related parameter reconfiguration or not to perform RRC-related parameter reconfiguration. Specifically, for example, if the QoS preference indicator indicates support or a value of 1, if the QCI for the bearer is a GBR bearer of 1, 2, 3, or 4, the base station guarantees QoS for the bearer, In the case of a non-GBR bearer with QCI of 5, 6, 7, 8 or 9, RRC-related parameter reconstruction based on low power consumption state can be performed regardless of QoS. In addition, if the QoS preference indicator indicates an unsupported value or a value of 0, the base station can perform RRC-related parameter reconfiguration based on the low power consumption state without guaranteeing the QoS for the bearer. That is, the GBR type bearer can perform radio resource reconfiguration based on low power consumption state without guaranteeing QoS. Or it may be set to the opposite case by an appointment between the terminal and the base station.

As another example, the QoS preference indicator may indicate whether or not the QoS guarantee is reserved (or violated). In other words, the QoS preference indicator may indicate whether or not the base station should guarantee or guarantee QoS in providing services to the terminal. Specifically, for example, if the QoS preference indicator indicates an unsupported or zero value, the base station may ignore the QoS for the bearer and perform RRC-related parameter reconfiguration based on the low power consumption state. Also, if the QoS preference indicator indicates support or a value of 1, the base station performs RRC-related parameter reconfiguration based on the low power consumption state, or performs RRC-related parameter reconfiguration based on the low power consumption state, while ensuring QoS for the bearer Or perform RRC-related parameter reconfiguration based on the normal state.

Of course, it is a matter of course that the values 0 and 1 described above can be set by reversing the promise between the base station and the terminal to indicate the QoS preference state of the terminal.

The terminal assistance information message including the power preference indicator and the QoS preference indicator may be configured as shown in Table 3 as an example.

- ASN1START

UEAssistanceInformation-r11 :: = SEQUENCE {
criticalExtensions CHOICE {
c1 CHOICE {
ueAssistanceInformation-r11 UEAssistanceInformation-r11-IEs,
spare7 NULL,
spare6 NULL, spare5 NULL, spare4 NULL,
spare3 NULL, spare2 NULL, spare1 NULL
},
criticalExtensionsFuture SEQUENCE {}
}
}

UEAssistanceInformation-r11-IEs :: = SEQUENCE {
powerPrefIndication-r11 PowerPrefIndication-r11 OPTIONAL,
nonCriticalExtension SEQUENCE {} OPTIONAL
}

- ASN1STOP

Referring to Table 3, the terminal assistance information message includes a powerPrefIndication-r11 information element (IE). The powerPrefIndication-r11 information element is used to provide information related to the power preference of the terminal, i.e., the power saving preference of the terminal. The powerPrefIndication-r11 information element may be configured as shown in Table 4, for example.

- ASN1START

PowerPrefIndication-r11 :: = SEQUENCE {
PowerConsumptionPref ENUMERATED {normal, lowpowerconsumption}
QoSInfoindicatoin ENUMERATED {Setup}
}
- ASN1STOP

Referring to Table 4, the powerPrefIndication-r11 information element includes a PowerConsumptionPref field and a QoSInfoindicatoin field. The PowerConsumptionPref field is a power preference indicator of the terminal, which indicates the power preference state of the terminal and can indicate a normal state and a low power consumption state. The QoSInfoindicateOn field is a QoS preference indicator of the UE and can indicate the UE's preference status for QoS guarantee (or QoS violation) according to a setup value.

For example, a packet delay budget may instruct QoS of a bearer corresponding to a QCI below (or below) a certain level. Specifically, for example, if the QoS preference indicator indicates a set value of 1, then the QCI indexes 1, 2, and 3 do not correspond to the QCI indices 4, 6, 8, and 9 with a packet delay budget of 300 ms or more for the bearer , 5, or 7 and the packet delay budget is smaller than 300 ms, the BS does not reconfigure the RRC-related parameters based on the low power consumption state to guarantee the QoS to the UE, or does not reconfigure the RRC-related parameters based on the normal state . Also, if the QoS preference indicator indicates a set value of 0, the base station can perform RRC-related parameter reconfiguration based on the low power consumption state regardless of the QCI packet delay budget for the bearer.

As another example, it can be instructed to guarantee QoS of the bearer corresponding to the QCI whose resource type is GBR. Specifically, for example, when the QoS preference indicator indicates a setup value of 1 and the QCI of the bearer is a GBR bearer of 1, 2, 3, or 4, the BS guarantees QoS for the bearer, RRC-related parameter reconfiguration based on low power consumption state can be performed irrespective of the QoS in case of a non-GBR type bearer of 5, 6, 7, 8 or 9. Also, if the QoS preference indicator indicates a setup value of 0, the base station can perform RRC-related parameter reconfiguration based on the low power consumption state without guaranteeing the QoS for the bearer. That is, the GBR type bearer can perform radio resource reconfiguration based on low power consumption state without guaranteeing QoS.

As another example, it can indicate whether or not QoS guarantee is reserved. Specifically, for example, if the QoS preference indicator indicates a setup value of 0, the base station may ignore the QoS for the bearer and perform RRC-related parameter reconfiguration based on the low power consumption state. In addition, when the QoS preference indicator indicates the set value 1, the base station performs RRC-related parameter reconfiguration based on the low power consumption state while ensuring QoS for the bearer, or does not perform RRC-related parameter reconfiguration based on the low power consumption state RRC-related parameter reconfiguration based on the normal state may be performed.

The above-described QoSInfoindicateOn field may indicate the terminal's preference state for QoS assurance only when the PowerConsumptionPref field is in a low power consumption state. The QoSInfoindicatoin field may be replaced by another term such as QoSInfoPref, QoSGuaranteePref or QoSSupportPref, depending on the appointment between the UE and the BS. The same shall apply hereinafter.

Meanwhile, the terminal assistance information message including the power preference indicator and the QoS preference indicator may be configured as shown in Table 5 as another example.

- ASN1START

UEAssistanceInformation-r11 :: = SEQUENCE {
criticalExtensions CHOICE {
c1 CHOICE {
ueAssistanceInformation-r11 UEAssistanceInformation-r11-IEs,
spare7 NULL,
spare6 NULL, spare5 NULL, spare4 NULL,
spare3 NULL, spare2 NULL, spare1 NULL
},
criticalExtensionsFuture SEQUENCE {}
}
}

UEAssistanceInformation-r11-IEs :: = SEQUENCE {
powerPrefIndication-r11 PowerPrefIndication-r11 OPTIONAL,
qosInfoindication-r11 QosInfoindication-r11 OPTIONAL,
nonCriticalExtension SEQUENCE {} OPTIONAL
}

- ASN1STOP

Referring to Table 5, the terminal assistance information message includes a powerPrefIndication-r11 information element and a qosInfoindication-r11 information element. The powerPrefIndication-r11 information element is used to provide information related to the power preference of the terminal, i.e., the power saving preference of the terminal. The qosInfoindication-r11 information element may always exist when the powerPrefIndication-r11 information element exists, and the qosInfoindication-r11 information element may exist only if the PowerConsumptionPref field included in the powerPrefIndication-r11 information element indicates a low power consumption state It is possible.

The powerPrefIndication-r11 information element may be configured as shown in Table 6, for example.

- ASN1START

PowerPrefIndication-r11 :: = SEQUENCE {
PowerConsumptionPref ENUMERATED {normal, lowpowerconsumption}
}
- ASN1STOP

Referring to Table 6, the powerPrefIndication-r11 information element includes a PowerConsumptionPref field. The PowerConsumptionPref field is a power preference indicator of the terminal, which indicates the power preference state of the terminal and can indicate a normal state and a low power consumption state.

In addition, the qosInfoindication-r11 information element can be configured as shown in Table 7, for example.

- ASN1START

PowerPrefIndication-r11 :: = SEQUENCE {
QoSInfoindicatoin ENUMERATED {Setup}
}
- ASN1STOP

Referring to Table 7, the qosInfoindication-r11 information element includes a QoSInfoindicatoin field. The QoSInfoindicateOn field is a QoS preference indicator of the UE, and indicates the UE's preference status for the QoS guarantee according to the setup value. The QoSInfoindicateOn field may indicate the terminal's preference status for QoS assurance only when the PowerConsumptionPref field is in a low power consumption state. As described above, the QoSInfoindicateOn field is a QoS preference indicator of the UE. For example, the QoSInfoindicatoin field may instruct QoS guarantee of a bearer corresponding to a QCI of a packet delay budget less than or equal to a certain level. As another example, it can be instructed to guarantee QoS of the bearer corresponding to the QCI whose resource type is GBR. As another example, it can indicate whether or not QoS guarantee is reserved.

Referring to FIG. 7 again, the BS reconstructs an RRC-related parameter, for example, a DRX-related parameter, based on the terminal assistance information message received in step S710, and transmits an RRC connection reconfiguration message including the RRC- .

The terminal assistance information message includes a power preference indicator. Based on the power preference indicator, the BS reconfigures RRC-related parameters including DRX-related parameters and the like in accordance with the power preference state of the UE indicated by the power preference indicator of the UE, and transmits the RRC connection reconfiguration Message to the terminal. In this case, the DRX-related parameter reconfiguration includes the contents described in S420.

In addition, the terminal assistance information message may include a QoS preference indicator (QPI). The QoS preference indicator may be included with the power preference indicator if the terminal assistance information message includes the power preference indicator, or the QoS preference indicator may be included in the power preference indicator, It may optionally be included only when the preference state is in a low power consumption state. The BS may reconfigure the RRC-related parameters in the UE in consideration of both the power preference indicator and the QoS preference indicator.

For example, if only the power preference indicator is included in the terminal ancillary information message and the QoS preference indicator is not included, the base station transmits an RRC-related parameter including a DRX-related parameter, The BS may reconfigure the MS according to the power preference state of the MS indicated by the power preference indicator of the MS and transmit the RRC reconnection message to the MS through the RRC reconnection message. However, if the power preference indicator is not included, the QoS guarantee can be set to be prioritized by the commitment of the subscriber station and the base station, and the base station can reconfigure the RRC related parameters only within the QoS guarantee range. Or if the power preference indicator is not included, the QoS guarantee is ignored by the commitment of the terminal and the base station, and the power preference state of the terminal indicated by the power preference indicator is given priority, Depending on the preference state, the RRC related parameters may be reconfigured.

Also, for example, if the power assistance indicator and the QoS preference indicator are all included in the terminal ancillary information message, and the power preference indicator indicates a low power consumption state, the base station transmits a state indicating a state indicated by the QoS preference indicator The RRC-related parameters can be reconfigured.

For example, when the state indicated by the QoS preference indicator indicates guarantee of the QoS of the bearer corresponding to the QCI of the packet delay budget (or less), the BS determines that the power preference state of the UE is in the low power consumption state The RRC-related parameters according to the low power consumption state may not be reconstructed in order to guarantee the QoS based on the QoS preference indicator. Specifically, for example, when the QoS preference indicator indicates 1, QCI indices 1, 2, 3, 5, and 7, which do not correspond to QCI indices 4, 6, 8, and 9 with a packet delay budget of 300 ms or more, If it is determined that the packet delay budget is smaller than 300 ms, the BS does not reconfigure the RRC-related parameters based on the low power consumption state, or performs the RRC-related parameter reconfiguration based on the normal state, in order to guarantee the QoS to the UE. Also, if the QoS preference indicator indicates 0, the base station can perform RRC-related parameter reconfiguration based on the low power consumption state regardless of the packet delay budget of the QCI for the bearer.

As another example, when the state indicated by the QoS preference indicator instructs to guarantee the QoS of the bearer corresponding to the QCI whose resource type is GBR, the base station assures QoS to perform RRC-related parameter reconfiguration or RRC-related parameter reconfiguration I can not. Specifically, for example, when the QoS preference indicator indicates 1, if the bearer is a GBR bearer with a QCI of 1, 2, 3, or 4, the BS guarantees QoS for the bearer and the QCI for the bearer is 5 , 6, 7, 8, or 9, it is possible to perform RRC-related parameter reconfiguration based on the low power consumption state regardless of the QoS. Also, if the QoS preference indicator indicates 0, the base station can perform RRC-related parameter reconfiguration based on the low power consumption state without guaranteeing the QoS for the bearer. That is, the GBR type bearer can perform radio resource reconfiguration based on low power consumption state without guaranteeing QoS. Or it may be set to the opposite case by an appointment between the terminal and the base station.

As another example, when the state indicated by the QoS preference indicator indicates whether or not the QoS guarantee is reserved (or violation), in other words, when the state indicated by the QoS preference indicator indicates that the base station provides QoS to the terminal Or does not guarantee QoS, the base station does not perform RRC-related parameter reconstruction based on the low power consumption state in preference to QoS guarantee, or does not perform RRC-related parameter reconstruction based on the low power consumption state Parameter reconstruction can be performed. Specifically, for example, if the QoS preference indicator indicates 1, the base station can ignore the QoS for the bearer and perform RRC-related parameter reconfiguration based on the low power consumption state. In addition, when the QoS preference indicator indicates 0, the BS performs RRC-related parameter reconfiguration based on the low power consumption state while ensuring QoS for the bearer, or does not perform RRC-related parameter reconfiguration based on the low power consumption state, Based RRC-related parameter reconfiguration.

The base station transmits the reconfigured RRC related parameters to the UE through the RRC reconfiguration message.

In accordance with the present invention as described above, not only the base station can reconfigure the RRC-related parameters based on the power preference of the UE to notify the UE of the RRC-related parameters, the UE can inform the base station of its preference for QoS, It is possible to confirm the preference for the QoS of the UE and adaptively reconfigure RRC related parameters. That is, the base station can support the terminal power preference in consideration of the preference of the terminal for QoS guarantee. Particularly, when the necessity of power saving is large and the satisfaction of QoS is not great, the base station restricts or does not support the QoS support for the service provided to the terminal for power saving, .

8 is a flowchart illustrating a method for supporting power preference of a terminal by a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the MS receives an RRC connection reconfiguration message from the BS (S800). The RRC connection reconfiguration message includes power preference indicator-capable information and power preference indicator-timer information. The power preference indicator-enabling information is information that permits or permits a terminal capable of transmitting the power preference indicator to transmit the power preference indicator to the base station. The power preference indicator-timer information includes time information regarding the power preference indicator inhibition timer. The PPI inhibition timer may indicate a minimum interval time for the UE to transmit the power preference indicator. For example, if the PPI inhibit timer is set to 5 minutes based on the power preference indicator-timer, the terminal can transmit the power preference indicator with a time interval of at least 5 minutes. In other words, the terminal sets and operates the PPI inhibit timer based on the power preference indicator-timer after transmitting the power preference indicator, and can not transmit the power preference information of the terminal again during the time when the PPI inhibit timer operates. This may be the case when the power preference state of the terminal is changed.

The terminal transmits the terminal assistance information message to the base station (S810). The terminal assistance information message includes a power preference indicator. The terminal assistance information message is an RRC dedicated message. In addition, the terminal assistance information message may include a QoS preference indicator. The QoS preference indicator may be included with the power preference indicator if the terminal assistance information message includes the power preference indicator, or the QoS preference indicator may be included in the power preference indicator if the power preference state of the terminal indicated by the power preference indicator is & And may be selectively included only in the power consumption state. The QoS preference indicator indicates a preference of the terminal for QoS. The terminal assistance information message may be configured as shown in Table 3, for example. In this case, the power preference indicator and the QoS preference indicator may be configured as shown in Table 4. In addition, the terminal assistance information message may be configured as shown in Table 5 as another example. In this case, the power preference indicator may be configured as shown in Table 6, and the QoS preference indicator may be configured as shown in Table 7. [

The MS receives the RRC connection reconfiguration message from the BS (S820). The RRC connection message may include an RRC-related parameter, e.g., a DRX-related parameter, reconstructed by the base station based on the terminal auxiliary information. The DRX-related parameter reconfiguration includes the contents described in S420. The UE may reconfigure the RRC related parameters received through the RRC connection reconfiguration message to the UE.

9 is a flowchart illustrating a method of supporting power preference of a terminal by a base station according to an exemplary embodiment of the present invention.

Referring to FIG. 9, the BS transmits an RRC connection reconfiguration message to the MS (S900). The RRC connection reconfiguration message includes power preference indicator-capable information and power preference indicator-timer information. The power preference indicator-enabling information is information that permits or permits a terminal capable of transmitting the power preference indicator to transmit the power preference indicator to the base station. The power preference indicator-timer information includes time information regarding the power preference indicator inhibition timer. The PPI inhibition timer may indicate a minimum interval time for the UE to transmit the power preference indicator.

The base station receives the terminal assistance information message from the terminal (S910). The terminal assistance information message includes a power preference indicator. The terminal assistance information message is an RRC dedicated message. In addition, the terminal assistance information message may include a QoS preference indicator. The QoS preference indicator may be included with the power preference indicator if the terminal assistance information message includes the power preference indicator, or the QoS preference indicator may be included in the power preference indicator if the power preference state of the terminal indicated by the power preference indicator is & And may be selectively included only in the power consumption state. The QoS preference indicator indicates a preference of the terminal for QoS. The terminal assistance information message may be configured as shown in Table 3, for example. In this case, the power preference indicator and the QoS preference indicator may be configured as shown in Table 4. In addition, the terminal assistance information message may be configured as shown in Table 5 as another example. In this case, the power preference indicator may be configured as shown in Table 6, and the QoS preference indicator may be configured as shown in Table 7. [

The base station reconstructs an RRC-related parameter, for example, a DRX-related parameter, based on the terminal assistance information message received in step S910, and transmits an RRC connection reconfiguration message including the reconfigured message to the terminal in step S920.

For example, when the state indicated by the QoS preference indicator indicates guarantee of the QoS of the bearer corresponding to the QCI of the packet delay budget (or less), the BS determines that the power preference state of the UE is in the low power consumption state The RRC-related parameters according to the low power consumption state may not be reconstructed in order to guarantee the QoS based on the QoS preference indicator. Specifically, for example, if the QoS preference indicator indicates support or a value of 1, the QCI indexes 1, 2, 3, and 5 do not correspond to QCI indices 4, 6, 8, and 9 with a packet delay budget of 300 ms or more for the bearer. , The packet delay budget is less than 300 ms, the BS does not reconfigure the RRC-related parameters based on the low power consumption state to guarantee the QoS to the UE, or performs the RRC-related parameter reconfiguration based on the normal state do. In addition, if the QoS preference indicator indicates a nonsense or a value of 0, the base station can perform RRC-related parameter reconfiguration based on the low power consumption state regardless of the QCI packet delay budget for the bearer.

As another example, when the state indicated by the QoS preference indicator instructs to guarantee the QoS of the bearer corresponding to the QCI whose resource type is GBR, the base station assures QoS to perform RRC-related parameter reconfiguration or RRC-related parameter reconfiguration I can not. Specifically, for example, if the QoS preference indicator indicates support or a value of 1, if the QCI for the bearer is a GBR bearer of 1, 2, 3, or 4, the base station guarantees QoS for the bearer, In the case of a non-GBR bearer with QCI of 5, 6, 7, 8 or 9, RRC-related parameter reconstruction based on low power consumption state can be performed regardless of QoS. In addition, if the QoS preference indicator indicates an unsupported value or a value of 0, the base station can perform RRC-related parameter reconfiguration based on the low power consumption state without guaranteeing the QoS for the bearer. That is, RRC-related parameter reconfiguration can be performed on the GBR type bearer based on the low power consumption state without guaranteeing the QoS. Or it may be set to the opposite case by an appointment between the terminal and the base station.

As another example, when the state indicated by the QoS preference indicator indicates whether or not the QoS guarantee is reserved (or violation), in other words, when the state indicated by the QoS preference indicator indicates that the base station provides QoS to the terminal Or does not guarantee QoS, the base station does not perform RRC-related parameter reconstruction based on the low power consumption state in preference to QoS guarantee, or does not perform RRC-related parameter reconstruction based on the low power consumption state Parameter reconstruction can be performed. Specifically, for example, if the QoS preference indicator indicates an unsupported or zero value, the base station may ignore the QoS for the bearer and perform RRC-related parameter reconfiguration based on the low power consumption state. Also, if the QoS preference indicator indicates support or a value of 1, the base station performs RRC-related parameter reconfiguration based on the low power consumption state, or performs RRC-related parameter reconfiguration based on the low power consumption state, while ensuring QoS for the bearer Or perform RRC-related parameter reconfiguration based on the normal state.

The base station transmits the reconfigured RRC related parameters to the UE through the RRC reconfiguration message. In this case, the BS may reconfigure RRC-related parameters in consideration of not only the power preference of the UE but also the QoS preference of the UE, and may transmit the reconfigured parameters to the UE through the RRC reconfiguration message.

10 is a block diagram illustrating a terminal and a base station supporting power preferences of other terminals according to an embodiment of the present invention.

Referring to FIG. 10, a terminal 1000 includes a terminal receiver 1005, a terminal processor 1010, and a terminal transmitter 1015. The terminal processor 1010 includes a terminal message processing unit 1011 and a preference determination unit 1012. [

The terminal reception unit 1005 receives power preference indicator-enable information, power preference indicator-timer information, and RRC-related parameters from the base station 1050.

The power preference indicator-enable information is information allowing or permitting a terminal capable of transmitting a power preference indicator (PPI) to transmit the power preference indicator to the base station. The power preference indicator-timer information includes time information regarding the PPI prohibition timer. The PPI inhibition timer may indicate a minimum interval time for the UE to transmit the power preference indicator. The power preference indicator-capable information and the power preference indicator-timer information may be included in the RRC connection reconfiguration message and transmitted from the base station 1050 to the terminal 1000. [

The RRC related parameter may be a parameter that is reconstructed by the base station 1050 based on the power preference indicator of the terminal 1000. [ The RRC-related parameters may include DRX-related parameters. The RRC related parameters may be included in the RRC connection reconfiguration message and transmitted from the base station 1050 to the terminal 1000.

The terminal message processing unit 1011 analyzes or analyzes the information or the syntax of the message received from the terminal receiving unit 1005. The terminal message processing unit 1011 can interpret the syntax of Table 1.

The terminal message processor 1011 interprets the received RRC connection reconfiguration message and confirms that the power preference indicator transmission of the terminal 1000 is permitted or commanded based on the power preference indicator-capable information included in the message. Also, the message processor 1011 sets the time of the PPI prohibition timer of the terminal based on the power preference indicator-timer information included in the message. Also, the terminal message processor 1011 can interpret the RRC connection reconfiguration message and obtain the RRC related parameters. The RRC related parameter may be a parameter that is reconstructed by the base station 1050 based on the power preference indicator of the UE. The RRC-related parameters may include DRX-related parameters, and the DRX-related parameters may include the contents described in S420 and the contents described in S720. The UE message processing unit 1011 may reconfigure (or apply) the RRC related parameters to the UE.

Also, the terminal message processing unit 1011 generates a terminal assistance information message. The terminal message processing unit 1011 may generate the terminal assistance information message including at least one of a power preference indicator and a QoS preference indicator. The terminal message processing unit 1011 may generate the terminal assistance information message including at least one of the power preference indicator and the QoS preference indicator based on the power preference state and / or the QoS preference state of the terminal.

The preference determination unit 1012 determines the power preference state of the terminal 1000. [ For example, the preference determination unit 1012 may determine the state of the normal state or the low power consumption state as the power preference state of the terminal 1000. [ The meaning of the normal state and the low power consumption state includes the contents described in S310.

In addition, the preference determination unit 1012 determines the QoS preference state of the terminal 1000. For example, the preference determination unit 1012 may determine the QoS preference state according to whether the QoS of the bearer corresponding to the QCI of the packet delay budget is equal to or less than a predetermined level. As another example, the preference determination unit 1012 determines the QoS preference state according to whether or not the QoS preference state of the terminal (1000) assures the QoS of the bearer corresponding to the QCI whose resource type is GBR can do. As another example, the preference determination unit 1012 may determine the QoS preference state according to whether or not the terminal is guaranteed to maintain the QoS. The meaning and the division of the QoS preference state include the contents described in S710.

The terminal transmission unit 1020 can transmit the terminal assistance information message generated by the terminal message processing unit 1011 to the base station 1050.

The base station includes a base station transmitting unit 1055, a base station receiving unit 1060, and a base station processor 1070. The base station processor 1070 includes a terminal message processing unit 1011 and a parameter changing unit 1072.

The base station transmitting unit 1055 may transmit the power preference indicator-capable information, the power preference indicator-timer information, and the RRC-related parameters to the terminal 1000. The power preference indicator-capable information, the power preference indicator-timer information, and the RRC-related parameters may be transmitted to the terminal 1000 through the RRC connection reconfiguration message.

The base station receiving unit 1060 receives the terminal assistance information message from the terminal 1000. The terminal assistance information message includes the power preference indicator. The terminal assistance information message may include the QoS preference indicator.

The base station message processing unit 1071 generates an RRC message. For example, the base station message processor 1071 may generate an RRC connection reconfiguration message including the power preference indicator-capable information and the power preference indicator-timer information. The base station message processing unit 1071 may generate an RRC connection reconfiguration message including the RRC related parameter received from the parameter changing unit 1072. [ For example, the base station message processing unit 1071 may generate a message having the same syntax as shown in Table 2 above.

The base station message processing unit 1071 analyzes or analyzes the syntax of the information or message received from the base station receiving unit 1060. For example, the base station message processing unit 1071 may analyze or interpret the messages having the syntax shown in Tables 3 to 6 above.

The base station message processing unit 1071 analyzes or analyzes the terminal ancillary information message and checks the power preference state of the terminal 1000 indicated by the power preference indicator of the terminal 1000 included in the terminal ancillary information message. For example, the power preference state of the terminal 1000 may be a normal state or a low power consumption state.

The base station message processing unit 1071 analyzes or analyzes the terminal assistance information message and checks the QoS preference state of the terminal 1000 indicated by the QoS preference indicator of the terminal 1000 included in the terminal assistance information message . For example, the QoS preference state may indicate whether the packet delay budget guarantees QoS of the bearer corresponding to a QCI below (or below) a certain level. As another example, the QoS preference state may be whether or not to guarantee the QoS of the bearer corresponding to the QCI whose resource type is GBR. As another example, the QoS preference state may indicate whether or not QoS guarantee is reserved.

The parameter changing unit 1072 may change or reconfigure RRC-related parameters based on the power preference state and / or the QoS preference state. The parameter changing unit 1072 may change or reconfigure the RRC-related parameters by reflecting the power preference state. For example, the parameter changing unit 1072 may reconfigure DRX-related parameters. In this case, the DRX-related parameter reconfiguration includes the contents described in S420.

As an example, if the power preference state of the terminal 1000 is in the low power consumption state, the parameter changing unit 1072 performs RRC-related parameter reconfiguration in a direction that can reduce battery consumption of the terminal. Specifically, for example, the parameter changing unit 1072 changes the DRX so that the terminal 1000 configures or reconfigures the DRX to operate in the long DRX mode, or the inactivity time in which the terminal does not monitor the PDCCH subframe is maintained longer. Lt; / RTI >

As another example, when the power preference state is the normal state, the parameter changing unit 1072 can perform the RRC-related parameter reconfiguration in a direction that can relatively increase the transmission efficiency as compared with the low power consumption state. Specifically, for example, the parameter changing unit 1472 may configure the DRX cycle to be shorter in length to increase the downlink transmission efficiency, or reconfigure DRX so that the inactivity time of the terminal 1400 is configured to be shorter have.

Also, the parameter changing unit 1072 may change or reconfigure the RRC-related parameters by reflecting the QoS preference state as well as the power preference state.

For example, when the QoS preference state indicates guarantee of QoS of a bearer corresponding to a QCI of a packet delay budget (or less), the parameter changing unit 1072 changes the power preference state of the terminal 1000 The RRC-related parameters according to the low power consumption state may not be reconfigured in order to guarantee the QoS based on the QoS preference state despite the low power consumption state. Specifically, for example, if the QoS preference indicator indicates support or a value of 1, the QCI indexes 1, 2, 3, and 5 do not correspond to QCI indices 4, 6, 8, and 9 with a packet delay budget of 300 ms or more for the bearer. , 7, and the packet delay budget is found to be smaller by 300 ms, the parameter change unit 1072 changes the packet delay budget for the terminal 1000 (300) if the packet delay budget for the bearer corresponds to QCI indices 4, 6, 8, ), It is possible not to reconfigure the RRC related parameters based on the low power consumption state, or to perform the RRC related parameter reconfiguration based on the normal state. Also, when the QoS preference indicator indicates a non-supported or zero value, the parameter changing unit 1072 can perform RRC-related parameter reconfiguration based on the low power consumption state regardless of the packet delay budget of the QCI for the bearer.

As another example, when instructing to guarantee the QoS of the bearer corresponding to the QCI having the resource type of GBR, the parameter changing unit 1072 assures QoS to perform RRC-related parameter reconfiguration or RRC-related parameter reconfiguration It may not be performed. Specifically, for example, when the QoS preference indicator indicates support or a value of 1, if the QCI for the bearer is a GBR bearer of 1, 2, 3, or 4, the parameter changing unit 1072 assures QoS for the bearer RRC-related parameter reconfiguration based on low power consumption state can be performed irrespective of QoS in case of non-GBR type bearer with QCI of 5, 6, 7, 8 or 9 for bearer. In addition, when the QoS preference indicator indicates the unsupported value or the value 0, the parameter changing unit 1072 can perform the RRC-related parameter reconfiguration based on the low power consumption state without guaranteeing the QoS for the bearer. That is, RRC-related parameter reconfiguration can be performed on the GBR type bearer based on the low power consumption state without guaranteeing the QoS. Or it may be set to the opposite case by an appointment between the terminal and the base station.

As another example, when the state indicated by the QoS preference indicator indicates whether or not the QoS guarantee is reserved (or violation), in other words, when the state indicated by the QoS preference indicator indicates that the base station provides QoS to the terminal Or does not guarantee QoS, the parameter changing unit 1072 does not perform RRC-related parameter reconstruction based on the low power consumption state in preference to QoS guarantee, or ignores the QoS guarantee and low power consumption State-based RRC-related parameter reconstruction. More specifically, for example, if the QoS preference indicator indicates an unsupported value or a value of 0, the parameter changing unit 1072 can ignore the QoS for the bearer and perform RRC-related parameter reconfiguration based on the low power consumption state . If the QoS preference indicator indicates support or a value of 1, the parameter changing unit 1072 performs RRC-related parameter reconfiguration based on the low power consumption state while ensuring QoS for the bearer, or performs RRC-related parameter reconciliation based on the low power consumption state It may not perform the parameter reconfiguration or perform the RRC-related parameter reconfiguration based on the normal condition.

The parameter changing unit 1072 transmits the changed or reconfigured RRC related parameter to the base station message processing unit 1071. [ Then, the base station message processor 1071 generates an RRC connection reconfiguration message including the reconfigured RRC related parameters. If DRX-related parameters are included in the RRC connection reconfiguration message, the RRC connection reconfiguration message may include the syntax shown in Table 1 above.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims

A method of supporting power preference of a terminal performed by a terminal,
Receiving a first Radio Resource Control (RRC) Connection Reconfiguration message including powerPrefIndication-Enabled information from the base station, the power reconfiguration message permitting transmission of a power preference indicator to a base station;
Comprising a power preference indicator (PPI) indicating a power preference state of the terminal and a QoS preference indicator (QPI) indicating a quality of service (QoS) preference state of the terminal, And transmitting the generated signal to the base station; And
Receiving a second RRC connection reconfiguration message from the base station, the RRC connection reconfiguration message including an RRC related parameter reconfigured by the base station based on the power preference indicator and the QoS preference indicator.

The method according to claim 1,
The power preference state of the terminal indicates a normal state or a low power consumption state,
The QoS preference state of the UE indicates whether the QoS of a bearer corresponding to a QoS class identifier (QCI) of a packet delay budget (PDB) is less than a predetermined level, whether a resource type is Guaranteed Bit Rate (GBR) ) QoS guarantee of the bearer corresponding to the QCI, or QoS guarantee is reserved.

3. The method of claim 2,
Wherein the QoS preference indicator of the terminal is included in the terminal assistance information message when the power preference state of the terminal indicates a low power consumption state.

3. The method of claim 2,
The terminal assistance information message includes a PowerPrefIndication information element (IE)
Wherein the power preference indicator information element indicates a power preference state of the terminal and a QoS preference state of the terminal.

3. The method of claim 2,
Wherein the terminal assistance information message includes a power preference indicator information element and a QoS information indicator (QoSInfoIndication) information element,
Wherein the power preference indicator information element indicates the power preference state of the terminal and the QoS information indicator information element indicates the QoS preference state of the terminal.

A method for supporting power preference of a terminal performed by a base station,
Transmitting a first RRC connection reconfiguration message to the terminal, the power RRC connection reconfiguration message including power preference indicator-enable information allowing the power preference indicator to be transmitted to the base station;
Receiving from a terminal a terminal assistance information message including the power preference indicator indicating a power preference state of the terminal and a QoS preference indicator indicating a QoS preference state of the terminal;
Reconfiguring RRC related parameters based on the power preference indicator and the QoS preference indicator; And
And transmitting a second RRC connection reconfiguration message including the reconfigured RRC related parameters to the UE.

The method according to claim 6,
Wherein the power preference state indicates a normal state or a low power consumption state.

8. The method of claim 7,
Wherein reconfiguring the RRC-related parameter reserves the RRC-related parameter reconfiguration according to the low power consumption state based on the QoS preference state, even though the power preference state is the low power consumption state How to support power preferences.

8. The method of claim 7,
Wherein the terminal assistance information message includes a power preference indicator information element,
Wherein the power preference indicator information element indicates a power preference state of the terminal and a QoS preference state of the terminal.

8. The method of claim 7,
Wherein the terminal assistance information message includes a power preference indicator information element and a QoS information indicator information element,
Wherein the power preference indicator information element indicates the power preference state of the terminal and the QoS information indicator information element indicates the QoS preference state of the terminal.

A terminal supporting power preference,
Receiving a first RRC connection reconfiguration message from the base station, the first RRC connection reconfiguration message including power preference indicator-enable information allowing the power preference indicator to be transmitted to the base station;
A preference determining unit for determining a power preference state and a QoS preference state of the terminal;
A message processor for generating a terminal assistance information message including the power preference indicator indicating the power preference state and the QoS preference indicator indicating the QoS preference state; And
And a transmitter for transmitting the generated terminal assistance information message to the base station,
Wherein the receiver receives from the base station a second RRC connection reconfiguration message including an RRC related parameter reconfigured by the base station based on the power preference indicator and the QoS preference indicator.

12. The method of claim 11,
Wherein the preference determining unit determines the power preference state of the terminal as a normal state or a low power consumption state,
The preference determining unit determines whether the QoS preference state of the UE is a QoS guarantee of a bearer corresponding to a QCI whose packet delay budget is less than a certain level, a QoS of a bearer corresponding to a QCI whose resource type is GBR, And judges whether or not it is guaranteed.

13. The method of claim 12,
Wherein the message processing unit selectively includes the QoS preference information in the terminal assistance information message when the power preference state of the terminal indicates a low power consumption state in generating the terminal assistance information message. Terminal.

13. The method of claim 12,
Wherein the message processor generates the terminal assistance information message including the power preference indicator information element,
Wherein the message processor indicates a power preference state of the terminal and a QoS preference state of the terminal in the power preference indicator information element.

13. The method of claim 12,
Wherein the message processor generates the terminal assistance information message including the power preference indicator information element and the QoS information indicator information element,
Wherein the message processing unit indicates the power preference state of the terminal in the power preference indicator information element and the QoS preference state of the terminal in the QoS information indicator information element.

A base station supporting power preference of the UE,
A transmitting unit for transmitting a first RRC connection reconfiguration message including power preference indicator-enabling information that allows a power preference indicator to be transmitted to the base station;
A receiver for receiving from the terminal a terminal assistance information message including the power preference indicator indicating a power preference state of the terminal and a QoS preference indicator indicating a QoS preference state of the terminal;
A parameter changing unit for reconfiguring an RRC-related parameter based on the power preference indicator and the QoS preference indicator; And
And a message processor for generating a second RRC connection reconfiguration message including the reconfigured RRC related parameter,
And the transmitter transmits the generated second RRC connection reconfiguration message to the UE.

17. The method of claim 16,
Wherein the parameter changing unit reconfigures the RRC related parameter including a DRX related parameter in a direction of reducing power consumption of the terminal when the power preference state is in a low power consumption state.

18. The method of claim 17,
Wherein the parameter changing unit reserves the RRC related parameter reconfiguration according to the low power consumption state based on the QoS preference state even though the power preference state is the low power consumption state.

17. The method of claim 17,
Wherein the parameter change unit changes the low power consumption state only when the packet delay budget of the QCI for the bearer configured in the terminal is less than a certain limit based on the QoS preference state even though the power preference state is the low power consumption state And performing RRC-related parameter reconfiguration according to the RRC-related parameters.

18. The method of claim 17,
The parameter changing unit may change the low power consumption state to the low power consumption state depending on whether the resource type of the QCI for the bearer configured in the terminal is GBR or not based on the QoS preference state even though the power preference state is the low power consumption state. And performing RRC-related parameter reconfiguration according to the RRC-related parameters.