KR102023010B1 - A method of transmitting and receiving paging - Google Patents

Abstract

The present invention relates to a wireless communication system. Specifically, in the method and apparatus for receiving a paging message in the terminal, receiving the paging configuration information and determines the first paging position (Paging Occasion) of the first paging frame (Paging frame) according to the paging configuration information step; Receiving DRX configuration information including on interval information of a Discontinuous Reception (DRX) cycle; And updating a first paging position of the first paging frame to a second paging position of a second paging frame included in an on period of the DRX cycle.

Description

A method of transmitting and receiving paging

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving a paging channel.

In an LTE system, a UE may monitor a paging channel (PCH) at a specific period in a specific location of a time domain according to a specific paging cycle in an idle state (eg, RRC_IDLE) and a connection state (eg, RRC_CONNECTED). have. In this case, the idle state refers to a state in which the UE does not establish a connection for controlling radio resources (eg, RRC (Radio Resource Control) connection) with the base station, and the connection state indicates that the UE connects to the base station for radio resource control. It may be set to refer to a state capable of transmitting and receiving data with the base station.

The terminal may receive a paging message transmitted by the base station by monitoring the paging channel. For example, a paging message can be used for signaling an incoming call in idle state. In addition, the paging message may be used to inform that system information has changed. In addition, the paging message may be used to inform the presence of a disaster-related message, such as Earthquake and Tsunami Warning System (ETWS) / Commercial Mobile Alert System (CMAS). Unlike the idle state, the paging message in the connected state may be commonly applied to all the terminals serviced by the corresponding base station, such as system information change or ETWS / CMAS.

Discontinuous reception (DRX) may be set by the base station in the connected state. When the DRX is configured in the connected state, the terminal may repeat the sleep mode and the wakeup mode in the DRX cycle set by the base station. At this time, the connection state DRX cycle may not be aligned with the paging cycle. When the paging reception position is in the sleep period in the terminal in which the connection state DRX is set, the terminal may repeatedly wake up the RF module to decode only the paging channel.

Since the mobile terminal has a limited power source such as a battery, it is desirable to minimize unnecessary power consumption. Accordingly, there is a need for a method for eliminating power consumption for paging channel reception in order to minimize power consumption.

An object of the present invention is to provide a method and an apparatus therefor for efficiently transmitting and receiving control information in a wireless communication system. Another object of the present invention is to provide a method and apparatus for minimizing power consumption in a mobile terminal.

Technical problems to be achieved in the present invention are not limited to the above technical problems, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

In one aspect of the present invention, there is provided a method for receiving a paging message at a terminal, the method receiving paging configuration information and according to the paging configuration information a first paging position (Paging Occasion) of the first paging frame (Paging Frame) Determining; Receiving DRX configuration information including on interval information of a Discontinuous Reception (DRX) cycle; And updating a first paging position of the first paging frame to a second paging position of a second paging frame included in an on period of the DRX cycle.

Advantageously, said paging configuration information includes period information of a paging cycle, said DRX configuration information further includes period information of a DRX cycle, and wherein said updating comprises a period of said DRX cycle being greater than a period of said paging cycle. May be performed if less than or equal to

Preferably, the updating may include (DRX cycle start position ≦ (T / N) × n × 10 <DRX cycle start position + on when the length of the on interval of the DRX cycle is greater than or equal to one radio frame length). Determining whether there is an n value satisfying an interval length), and if the n value exists, determining the second paging frame as a frame corresponding to (T / N) × n value, T may be a period of paging cycle, N may be min (T, nB), and nB may be the multiple parameter.

More preferably, the terminal is set to operate in a frequency division duplex (FDD), and the updating step is, if the n value is present, subframe 9 in the second paging frame to the second paging position; It may further include determining as.

More preferably, the terminal is configured to operate in a time division duplex (TDD), and wherein the updating comprises subframe number 0 in the second paging frame when the value n is present, in the second paging position. It may further include determining as.

Advantageously, said updating comprises: (DRX cycle start position ≦ (T / N) × n × 10 + PO (k) <DRX when the length of the on-interval of the DRX cycle is less than or equal to one radio frame length) Determining whether there is an n value and a PO (k) value satisfying a cycle start position + an on interval length), and when the n value and the PO (k) value exist, the second paging frame is recalled. And determining a radio frame corresponding to a value of (T / N) × n, wherein T is a period of a DRX cycle, N is min (T, nB), and nB may be the multiple parameter.

More preferably, in the updating, when the n value and the PO (k) value exist, the second paging of the subframe corresponding to the minimum value of the PO (k) values in the second paging frame is performed. The determining may further include determining the position.

In this case, the nB may be one of 4T, 2T, T, T / 2, T / 4, T / 8, T / 16, and T / 32.

Advantageously, the method may further comprise receiving said paging message at a second paging location of said second paging frame.

In another aspect of the present invention, a terminal for receiving a paging message in a connected state is provided, the terminal comprising: a radio frequency (RF) module; And a processor, wherein the processor receives paging configuration information through the RF module and determines a first paging position of a first paging frame according to the paging configuration information, and the RF module Receiving DRX configuration information including on interval information of a Discontinuous Reception (DRX) cycle, and a second paging of a second paging frame including a first paging position of the first paging frame within an on interval of the DRX cycle It can be configured to update to a location.

Advantageously, said paging configuration information includes period information of a paging cycle, said DRX configuration information further includes period information of a DRX cycle, and wherein said updating is such that a period of said DRX cycle is less than a period of said paging cycle. Or the like.

Advantageously, said updating if the length of the on-interval of the DRX cycle is greater than or equal to one radio frame length, (DRX cycle start position ≤ (T / N) x n x 10 <DRX cycle start position + on interval). Determining whether there is an n value satisfying the length), and if the n value exists, determining the second paging frame as a radio frame corresponding to ((T / N) × n value; T may be a period of a paging cycle, N may be min (T, nB), and nB may be the multiple parameter.

More preferably, the terminal is configured to operate in a frequency division duplex (FDD), and the updating means that when the value of n is present, subframe 9 in the second paging frame is moved to the second paging position. May further comprise determining.

More preferably, the terminal is configured to operate in a time division duplex (TDD), and the updating means that when the value of n is present, subframe 0 is moved to the second paging position in the second paging frame. May further comprise determining.

Advantageously, said updating if the on-interval length of said DRX cycle is less than or equal to one radio frame length, then (DRX cycle start position ≤ (T / N) x n x 10 + PO (k) <DRX cycle Determining whether there is an n value and a PO (k) value satisfying a starting position + an on interval length), and when the n value and the PO (k) value exist, the second paging frame is stored in the ( And determining a radio frame corresponding to a T / N) × n value, where T is a period of a DRX cycle, N is min (T, nB), and nB may be the multiple parameter.

More preferably, when the n value and the PO (k) value are present, updating the subframe corresponds to a minimum value of the PO (k) value within the second paging frame. It may further include determining as.

In this case, the nB may be one of 4T, 2T, T, T / 2, T / 4, T / 8, T / 16, and T / 32.

Advantageously, said processor may also be configured to receive said paging message at a second paging location of said second paging frame.

According to the present invention, it is possible to efficiently transmit and receive control information in a wireless communication system. In detail, the wireless communication system can efficiently transmit and receive a paging channel.

In addition, according to the present invention, it is possible to reduce power consumption in the mobile terminal. Specifically, the mobile terminal can eliminate power consumption for paging channel reception while maintaining the reliability of paging channel reception.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

The accompanying drawings are provided to aid the understanding of the present invention, and together with the detailed description, provide embodiments of the present invention. However, the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute new embodiments.
1 illustrates physical channels used in a 3GPP LTE system and a general signal transmission method using the same.
2 illustrates a structure of a radio frame.
3 illustrates a resource grid for a downlink slot.
4 illustrates a structure of a downlink subframe.
5 illustrates an example of DRX configuration information received through a higher layer message (eg, an RRC message).
6 illustrates monitoring a paging channel when DRX is configured in a terminal.
7 illustrates a method of updating or recovering PF, PO, and T values when a state transition of a terminal is performed according to an embodiment of the present invention.
8 illustrates a procedure of updating a T value when a terminal transitions from an idle state to a connected state according to an embodiment of the present invention.
9 illustrates a procedure of updating a PF and a PO when a terminal receives a DRX configuration in a connected state according to an embodiment of the present invention.
10 illustrates a procedure of recovering PF and PO when the terminal receives DRX release in a connected state according to an embodiment of the present invention.
11 illustrates a procedure for recovering PF and PO when the terminal transitions from the connected state to the idle state according to an embodiment of the present invention.
12 illustrates a method of updating PF and PO according to an embodiment of the present invention.
13 illustrates an example of adjusting a paging cycle by updating PF and PO according to an embodiment of the present invention.
14 illustrates a base station and a terminal that can be applied to the present invention.

The following embodiments combine the components and features of the present invention in a predetermined form. Each component or feature may be considered to be optional unless otherwise stated. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, some components and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.

In the description of the drawings, procedures or steps which may obscure the gist of the present invention are not described, and procedures or steps that can be understood by those skilled in the art are not described.

Embodiments of the present invention have been described with reference to data transmission / reception relations in a wireless communication system including a base station. Here, the base station has a meaning as a terminal node of a network that directly communicates with the terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.

That is, various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station. In this case, the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an advanced base station (ABS), or an access point.

In addition, in the present invention, the terminal refers to a terminal that is a target of a paging method in the wireless communication system according to the present invention, and may simply be referred to as a device. In addition, the terminal may include a mobile station (MS), a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), a mobile terminal, and a terminal. Alternatively, terms such as device may be substituted.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of wireless communication systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system and 3GPP2 system. That is, obvious steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various wireless communication systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is the evolution of 3GPP LTE. In the present specification, for convenience of description, the present invention will be described based on the LTE system, but the present invention is not limited to the LTE system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates physical channels used in a 3GPP LTE system and a general signal transmission method using the same.

The terminal which is powered on again or enters a new cell while the power is turned off performs an initial cell search operation such as synchronizing with the base station in step S101. To this end, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and provides information such as a cell identity. Acquire. Thereafter, the terminal may receive a physical broadcast channel (PBCH) from the base station to obtain broadcast information in a cell. Meanwhile, the terminal may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.

After completing the initial cell search, the UE receives a physical downlink shared channel (PDSCH) according to a physical downlink control channel (PDCCH) and physical downlink control channel information in step S102. System information can be obtained.

Thereafter, the terminal may perform a random access procedure such as steps S103 to S106 to complete the access to the base station. To this end, the UE transmits a preamble through a physical random access channel (PRACH) (S103), a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. Can be received (S104). In case of contention based random access, contention resolution procedure such as transmission of an additional physical random access channel (S105) and a physical downlink control channel and corresponding physical downlink shared channel reception (S106) ) Can be performed.

After performing the above-described procedure, the UE performs a general downlink control channel / physical downlink shared channel reception (S107) and a physical uplink shared channel (PUSCH) / as a general uplink / downlink signal transmission procedure. Physical uplink control channel (PUCCH) transmission (S108) may be performed. The control information transmitted from the terminal to the base station is collectively referred to as uplink control information (UCI). UCI includes Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK (HARQ ACK / NACK), Scheduling Request (SR), Channel State Information (CSI), and the like. The CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indication (RI), and the like. UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data should be transmitted at the same time. In addition, the UCI may be aperiodically transmitted through the PUSCH by the request / instruction of the network.

2 illustrates a structure of a radio frame. In a cellular OFDM wireless packet communication system, uplink / downlink data packet transmission is performed in units of subframes (SFs), and one subframe is defined as a predetermined time interval including a plurality of OFDM symbols. The 3GPP LTE standard supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).

2 (a) illustrates the structure of a type 1 radio frame. The downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). For example, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms. One slot includes a plurality of OFDM symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain. In the 3GPP LTE system, since OFDM is used in downlink, an OFDM symbol represents one symbol period. An OFDM symbol may also be referred to as an SC-FDMA symbol or symbol period. A resource block (RB) as a resource allocation unit may include a plurality of consecutive subcarriers in one slot.

The number of OFDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP). CP has an extended CP (normal CP) and a normal CP (normal CP). For example, if an OFDM symbol is usually configured by CP, the number of OFDM symbols included in one slot may be seven. When an OFDM symbol is configured by an extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that in the case of a normal CP. For example, in the case of an extended CP, the number of OFDM symbols included in one slot may be six. When the channel state is unstable, such as when the terminal moves at a high speed, an extended CP may be used to further reduce intersymbol interference.

In general, when CP is used, one slot includes 7 OFDM symbols, so one subframe includes 14 OFDM symbols. First up to three OFDM symbols of a subframe may be allocated to a physical downlink control channel (PDCCH) and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).

2 (b) illustrates the structure of a type 2 radio frame. Type 2 radio frames consist of two half frames, each half frame consists of five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time (UpPTS). Slot). One subframe consists of two slots. DwPTS is used for initial cell search, synchronization or channel estimation at the terminal. UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. The guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink. Table 1 illustrates UL-DL configuration (Uplink-Downlink Configuration) of subframes in a radio frame in the TDD mode.

In Table 1, D denotes a downlink subframe (DL SF), U denotes an uplink subframe (UL SF), and S denotes a special subframe. Special subframes include DwPTS, GP, and UpPTS. Table 2 illustrates the configuration of a special subframe.

The structure of the radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of symbols included in the slot may be variously changed.

3 illustrates a resource grid for a downlink slot.

Referring to FIG. 3, the downlink slot includes a plurality of OFDM symbols in the time domain. Here, one downlink slot includes 7 OFDM symbols and one resource block (RB) is illustrated as including 12 subcarriers in the frequency domain. However, the present invention is not limited thereto. Each element on the resource grid is referred to as a resource element (RE). One RB contains 12x7 REs. The number NDL of RBs included in the downlink slot depends on the downlink transmission band. The structure of the uplink slot may be the same as the structure of the downlink slot.

4 illustrates a structure of a downlink subframe.

Referring to FIG. 4, a subframe includes a plurality of time domains multiplexed with time division multiplexing (TDM). The first time domain may be used for the transmission of the control signal. The second time domain can be used for the transmission of the data signal. For convenience, the first time domain may be referred to as a control region and the second time domain may be referred to as a data region. In detail, up to three (or four) OFDM symbols located in front of the first slot in a subframe correspond to a control region for control channel allocation. The remaining OFDM symbols correspond to a data region to which a Physical Downlink Shared Channel (PDSCH) is allocated, and the basic resource unit of the data region is RB. Examples of the downlink control channel used in LTE include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), a Physical Hybrid ARQ Indicator Channel (PHICH), and the like. The PCFICH is transmitted in the first OFDM symbol of a subframe and carries information on the number of OFDM symbols used for transmission of a control channel within the subframe. The PHICH is a response to uplink transmission and carries an HARQ ACK / NACK (acknowledgment / negative-acknowledgment) signal. Control information transmitted through the PDCCH is referred to as downlink control information (DCI). DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain group of terminals.

The PDCCH includes transmission format and resource allocation of a downlink shared channel (DL-SCH), resource allocation information for an uplink shared channel (UL-SCH), paging information for a paging channel (PCH), and system information on the DL-SCH. ), Resource allocation information of a higher-layer control message such as a random access response transmitted on a PDSCH, transmission power control commands for individual terminals in an arbitrary terminal group, activation of voice over IP (VoIP), and the like. . A plurality of PDCCHs may be transmitted in the control region. The terminal may monitor the plurality of PDCCHs. The PDCCH is transmitted on an aggregation of one or a plurality of consecutive Control Channel Elements (CCEs). CCE is a logical allocation unit used to provide a PDCCH of a predetermined coding rate according to a state of a radio channel. The CCE corresponds to a plurality of resource element groups (REGs). The format of the PDCCH and the number of bits of the available PDCCH are determined according to the correlation between the number of CCEs and the code rate provided by the CCEs. The base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information. The CRC is masked with a unique identifier (referred to as a radio network temporary identifier (RNTI)) depending on the owner of the PDCCH or the intended use. If the PDCCH is for a specific UE, a unique identifier (eg, C-RNTI (cell-RNTI)) of the UE is masked on the CRC. As another example, if the PDCCH is for a paging message, a paging indication identifier (eg, p-RNTI (p-RNTI)) is masked in the CRC. If the PDCCH relates to system information (more specifically, a system information block (SIB) to be described later), a system information identifier (eg, a system information RNTI (SI-RNTI)) is masked to the CRC. A random access-RNTI (RA-RNTI) is masked in the CRC to indicate a random access response, which is a response to the transmission of the random access preamble of the terminal. In the present specification, a process of searching for a PDCCH having an identifier corresponding to the terminal may be referred to as monitoring.

5 shows an example of receiving a paging channel. When receiving a paging message, a discontinuous reception (DRX) may be set in the terminal for the purpose of reducing power consumption. To this end, the base station provides at least one paging location (or paging opportunity) (Paging Occasion, PO) every specific time period, referred to as a paging DRX cycle (Paging DRX Cycle) and a specific terminal to obtain a paging message at a specific paging location To help. The paging DRX cycle may refer to a period during which a paging message is transmitted in an idle state. The terminal does not receive a paging channel at a time other than a specific paging location. One paging location may correspond to one TTI. In the present specification, a paging location PO through which a paging channel (or paging message) is transmitted may be referred to as a paging subframe or a paging opportunity.

The terminal receives the downlink channel at the designated paging position. Specifically, the terminal wakes up to the corresponding paging location and receives the PDCCH. When receiving a PDCCH masked with P-RNTI (Paging-RNTI) corresponding to paging, the UE receives a radio resource indicated by the PDCCH. The actual paging message is transmitted over the radio resource. The terminal receives the paging message, checks whether there is an identifier (eg, an IMSI (International Mobile Subscriber Identity)), and if there is a matching identifier, informs that paging has arrived at the upper end.

In detail, the UE wakes up from a specific paging position (paging occsion) given to it within a certain paging period (eg, paging DRX cycle) and monitors the PDCCH. When a paging identifier indicating whether a paging message to be transmitted to the terminal exists through the PDCCH is received, the terminal receives the paging identifier. If the paging identifier is not received, the UE transitions to a sleep state and wakes up at a specific paging location of the next paging period to monitor the PDCCH.

The paging identifier may be anything that informs the terminal of the presence of a paging message. For example, the paging identifier may be a specific bit or bit string. The paging identifier may also be indicated with a specific code. In addition, the paging identifier may be cell-specific, service-specific or group-specific. That is, the paging identifier is common to all corresponding terminals in the cell, all terminals related to a specific service, or all terminals in a group formed by a predetermined condition.

In addition, the terminal may be connected to a paging channel at a specific paging reception position determined using a period of paging cycle (eg, defaultPagingCycle) and a multiple parameter (eg, nB) that are received through paging configuration information (eg, PCCH-Config) even in a connected state. Can be monitored. For convenience, the period of the paging cycle is referred to herein as T, and the multiple parameter of the paging cycle is referred to as nB.

The UE may determine a paging frame (PF) and a paging position (Paging Occasion, PO) in the paging frame using the received T value and the nB value. The PO may refer to a subframe in which a downlink control channel (eg, PDCCH) for scheduling a paging message exists. In this case, the downlink control channel may be scrambled with a specific identifier (eg, P-RNTI). As mentioned above, PO means a paging opportunity where a paging message is provided by a base station and may be referred to as a paging subframe or paging location. The paging frame PF may refer to a radio frame in which a paging message is transmitted, and may include one or more paging positions PO. The terminal may monitor one PO in every paging cycle.

For example, PF and PO may be calculated as follows using system information (ie, paging configuration information) broadcast by the base station. PF can be calculated by, for example, Equation 1.

PO can be obtained from Table 3 or Table 4 using, for example, the i_s value calculated by equation (2). In Equation 1, SFN represents a system frame number.

In Equations 1 and 2, mod denotes a modulo operation, div denotes a quotient operation, and floor denotes a descending operation. The parameters used in Equations 1 and 2 will be described below.

T: A parameter given by the base station and indicates a period of a paging cycle. For convenience, the period of the paging cycle herein may be mixed with the paging cycle. The paging period is short compared to the default DRX value broadcast in system information if the UE specific DRX value is assigned by higher layer. If the UE specific DRX value is not set by the higher layer, then the default DRX value broadcast in system information is used.

NB: A parameter given by the base station, and may have values of 4T, 2T, T, T / 2, T / 4, T / 8, T / 16, and T / 32.

N: min (T, nB)

Ns: max (1, nB / T)

UE_ID: UE identification information, which may be determined by IMSI mod 1024 as an example. Here, IMSI is a unique value of the UICC held by the terminal.

Tables 3 and 4 show subframe patterns in the case of a frequency division duplex (FDD) system and a time division duplex (TDD) system, respectively.

For example, if the nB value is less than or equal to T, the Ns value is one. Since Ns is 1, the modulo operation value of Equation 2 is 0 and i_s cannot have another value. In Table 3, when Ns is 1 and i_s value is 0, the PO value is 9. This means that when the nB value is less than or equal to T, a paging channel is received in subframe 9 (ie, the last subframe) of each paging frame. Similarly, in the case of TDD, referring to Table 4, a paging channel is received in subframe 0 (ie, the first subframe) of each paging frame.

Also, for example, when the nB value is 2T, the Ns value is 2. Since the Ns value is 2, the modulo operation value of Equation 2 may be 0 or 1, and i_s may not have a value of 2 or 3. For FDD, when Ns is 2 and i_s is 0 in Table 3, the PO value is 4. This means that a paging channel is received in the fourth subframe (ie, the fifth subframe) of each paging frame. Similarly, in the case of TDD, referring to Table 4, it means that a paging channel is received in subframe 0 of each paging frame.

Likewise, in other cases PO can be derived using Equation 2 and Table 3 or Table 4.

The terminal receives the system information broadcast from the base station at the time of initial network entry or cell movement, the paging channel (or paging message) every paging cycle using PF and PO calculated using Equations 1 and 2 Can be received.

6 illustrates monitoring a paging channel when DRX is configured in a terminal in a connected state.

In the connected state, the UE may perform discontinuous reception (DRX) by using DRX configuration information received through higher layer signaling (eg, RRC signaling). For example, the DRX configuration information may be DRX-Config, for example received via Medium Access Control (MAC) configuration information (eg, MAC-MainConfig IE) of a higher layer message (eg, RRCConnectionSetup message or RRCConnectionReconfiguration message). Can be. The DRX configuration information includes on section information (eg, onDurationTimer) indicating a section in which the UE is on in a DRX cycle and DRX cycle information (eg, longDRX-CycleStartOffset) indicating a start offset and a period of the DRX cycle. It may include. The on period may mean a period in which the terminal is in the wakeup mode as an active state. The on period information (eg, onDurationTimer) may specify the number of subframes having a downlink control channel continuous at the start of the DRX cycle. For example, the onDurationTimer information may specify the number of consecutive PDCCH-subframes (ie, subframes in which the PDCCH is transmitted) at the beginning of the DRX cycle. In the following table, psf1 may correspond to one PDCCH subframe, psf2 may correspond to two PDCCH subframes, and the rest thereof is the same.

The DRX cycle information (eg, longDRX-CycleStartOffset) may include start offset information (eg, drxStartOffset) of the DRX cycle and period information (eg, longDRX-Cycle) of the DRX cycle. In the DRX cycle information, sf10 may correspond to 10 subframes, sf20 may correspond to 20 subframes, and so on. The start offset information of the DRX cycle may specify a subframe at which the DRX cycle begins. The period information of the DRX cycle may specify the period of the DRX cycle in subframe units. Therefore, the start position of the DRX cycle can be determined by the DRX cycle information. When the DRX is configured in the connected state, the UE may repeat the sleep mode and the wakeup mode at a location and a period determined by the DRX cycle information and the on period information. When the actual transmission and reception occurs, the sleep time and the wake up time may be variable, but the active interval may be guaranteed for a time determined by the on-section information. In the present specification, when DRX is set in the connected state, it may be referred to as a connected state DRX.

Referring to FIG. 6 (a), an operation performed by the terminal when the connection state DRX is set is illustrated with respect to time (610). The terminal may determine a DRX cycle and an on period using DRX configuration information (eg, DRX-Config) received through a higher layer message. The UE may communicate with the base station by receiving a control channel (eg, PDCCH) for scheduling downlink and uplink data or control information during the on period. In the remaining sections except the on section of the DRX cycle, the terminal may be in a sleep state and the RF module may be turned off.

In addition, even when in a connected state (eg, RRC_CONNECTED), paging reception for system information change or ETWS / CMAS may be very important to the terminal. When such paging is transmitted from the base station to the terminal, the terminal needs to receive it within a predetermined time. The terminal may receive a paging channel by determining a paging location (ie, PF and / or PO) using the system information and switching to a wake-up state at the determined paging location. As illustrated in FIG. 6 (a), the position for monitoring the paging channel and the on interval of the DRX may not be aligned with each other. In this case, the terminal needs to switch from the sleep state to the wake up state to decode the paging channel at a given paging position.

Referring to FIG. 6B, power consumed in the terminal is illustrated with respect to time (620). As described with reference to FIG. 6 (a), when the connected state DRX is set, the terminal should switch to the wake-up mode to communicate with the base station in the on period, and switch to the wake-up mode to decode the paging channel at the paging position. Should be. In each case, when switching to the wake-up mode, the terminal supplies clock and / or power to each module of the terminal to wake up the terminal for the predetermined time interval, and performs initialization if necessary. It requires a certain power to do (620). Likewise, when receiving a paging channel, the UE must consume power _for a predetermined time (eg, t _{Wakeup _ for _ PCH} ) in preparation for decoding the paging channel.

Therefore, the UE is given a time within 1 TTI (Transmission Time Interval) for paging channel decoding, but a longer wake-up time is required for paging channel decoding in the sleep state (eg, when the RF module is turned off). Can be. This can directly affect power consumption.

In addition, even when in a connected state (eg, RRC_CONNECTED), paging reception for system information change or ETWS / CMAS may be very important to the terminal. When such paging is transmitted from the base station to the terminal, the terminal needs to receive it within a predetermined time. However, in the connected state, not the paging for a specific terminal can receive the paging commonly applied to the base station and all the terminals in service. Therefore, if the paging reception period is maintained, paging reception may be fine even if monitoring at the paging transmission position for any other terminal. Therefore, in the system in which the connected state DRX is set, the paging receiving position may be aligned with the active period (eg, the on period) instead of the sleep period of the connected state DRX in order to effectively improve the current consumption in the connected state. Through this, it is possible to minimize the current consumption of the terminal while maintaining the reliability for the paging reception. The present invention proposes a method and system for identifying a paging pattern in a current LTE system and checking whether a period of a connected state DRX is aligned with a current paging period to receive paging in an active period of the connected state DRX.

First, we analyze the PF pattern and the PO pattern to identify the paging pattern. In order to analyze the PF pattern, the N value of Equation 1 may be arranged as shown in Table 5 according to the nB value given in the system information (or paging configuration information).

In addition, Equation 1 may be arranged as follows according to the nB value.

If nB = 4T, SFN mod T = (UE_ID mod T)

If nB = 2T, SFN mod T = (UE_ID mod T)

If nB = T, SFN mod T = (UE_ID mod T)

If nB = T / 2, SFN mod T = 2 * {UE_ID mod (T / 2)}

If nB = T / 4, SFN mod T = 4 * {UE_ID mod (T / 4)}

If nB = T / 8, SFN mod T = 8 * {UE_ID mod (T / 8)}

If nB = T / 16, SFN mod T = 16 * {UE_ID mod (T / 16)}

If nB = T / 32, then SFN mod T = 32 * {UE_ID mod (T / 32)}

As mentioned above, since the UE_ID may be determined by IMSI mod 1024 as identification information of the UE, the UE_ID may be regarded as a random value having an arbitrary value. Accordingly, UE_ID may be represented by n (0 ≦ n <1024 * (N / T)). In summary, the PF pattern can be expressed as Equation 3 below.

Referring to Equation 3, PF indicates a radio frame position where a paging message is transmitted within a paging cycle, PF may be determined by the terminal identification information. When nB is greater than or equal to T, since N is T, the PF may be determined as a radio frame corresponding to the terminal identification information within a paging cycle. Therefore, when the nB value is T or more, the paging message may be transmitted in every radio frame in the paging cycle according to the n value, and PF may be determined as any radio frame in the paging cycle in accordance with the n value. In addition, when the nB value is 4T, since the Ns value is 4, four POs may exist within the determined radio frame. In addition, when the nB value is 2T, since the Ns value is 2, two POs may exist in the determined radio frame. In addition, when the nB value is T, since the Ns value is 1, there may be one PO in the determined radio frame.

When the nB value is T / 2, the PF may be determined as a radio frame having SFN corresponding to a multiple of 2 in one paging cycle according to Equation (3). Therefore, when the nB value is T / 2, a paging message may be transmitted in every even radio frame in the paging cycle according to the n value, and PF may be determined as any even radio frame in the paging cycle according to the n value. At this time, since the Ns value is 1, there is one PO in the PF.

When the nB value is T / 4, PF may be determined as a radio frame having SFN corresponding to a multiple of 4 in one paging cycle according to Equation (3). Therefore, when the nB value is T / 4, a paging message may be transmitted in every four multiple radio frames in the paging cycle according to the n value, and PF may be determined to be any four multiple radio frame in the paging cycle according to the n value. Can be. At this time, since the Ns value is 1, there is one PO in the PF. The same principle can be applied to the remaining nB values.

PO patterns can be arranged like PF patterns. In an embodiment, the FDD system may be arranged as shown in Equation 4 based on Equations 2 and 3 below.

Referring to Equation 4, when nB is 4T, the PO pattern of FDD may transmit a paging channel in subframes 0, 4, 5, and 9 of each paging frame. In addition, when nB is 2T, a paging channel may be transmitted in subframes 4 and 9 of each paging frame. In addition, when nB is less than or equal to T, a paging channel may be transmitted in subframe 9 of each paging frame.

In one embodiment, in the case of the TDD system, the PO pattern may be arranged as shown in Equation 5 based on Equation 2 and Table 4.

Referring to Equation 5, when the nB is 4T, the PO pattern of TDD may transmit a paging channel in subframes 0, 1, 5, and 6 of each paging frame. In addition, when nB is 2T, a paging channel may be transmitted in subframes 0 and 5 of each paging frame. In addition, when nB is T, a paging channel may be transmitted in subframe 0 of each paging frame.

7 illustrates a method of updating or recovering PF, PO, and T values when a state (eg, RRC state) transition of a terminal is performed according to an embodiment of the present invention.

Referring to FIG. 7, when the UE transitions from the idle state (eg, RRC_IDLE) 710 to the connected state (eg, RRC_CONNECTED) 720, the terminal may update the T value (S702). The procedure for updating the T value will be described in detail with reference to FIG. 8. When the DRX is set in the connection state 720 (740), the terminal may update the PF and PO values (S704). The procedure for updating the PF and PO values will be described in detail with reference to FIG. 9. In addition, when the DRX is released or turned off in the connection state 720 (730), the terminal may restore the stored PF and PO values (S706). The procedure for recovering the PF and PO values will be described in detail with reference to FIG. 10. When the terminal transitions from the connected state 720 to the idle state 710, the terminal may recover the PF, PO, and T values (S708). A procedure for recovering the PF, PO, and T values will be described in detail with reference to FIG. 11.

8 illustrates a procedure (S702) of updating a T value when a terminal transitions from an idle state (eg, RRC_IDLE) 710 to a connected state (eg, RRC_CONNECTED) 720 according to an embodiment of the present invention. .

Referring to FIG. 8, the terminal may enter a connected state from an idle state (S802). When entering the connected state, the terminal determines whether to support the ETWS or CMAS (S804). If the terminal does not support both ETWS and CMAS, it is possible to modify the paging cycle received from the system information (S806). For example, in step S806, the UE may modify a paging cycle value by multiplying a paging cycle of system information by modification period information (eg, modificationPeriodCoeff) previously received through broadcast configuration information (eg, BCCH-Config). . In this case, the modification period information may be represented by the number of radio frames.

If the terminal supports ETWS or CMAS, it may update the period (eg, T) of the paging cycle received from the system information to a paging cycle (S808).

9 illustrates a procedure S704 of updating a PF and a PO when the terminal receives a DRX configuration in a connected state (eg, RRC_IDLE) 710 according to an embodiment of the present invention.

Referring to FIG. 9, in the connected state, the UE may receive that DRX is set through the DRX configuration information (S902). The terminal may determine whether the connection state DRX pattern determined by the DRX configuration information may include a paging pattern determined by the paging configuration information. For example, the terminal may determine whether a DRX cycle (eg, longDRX-cycle) received from DRX configuration information (eg, DRX-Config) is greater than a paging cycle (eg, T) (S904). If the connection state DRX pattern may include a paging pattern, the terminal may update the PF and the PO. For example, if the received DRX cycle is greater than the paging cycle, the UE may update the PF and the PO (S906). When PF and PO are updated, the updated PF and PO may be different from the existing PF and PO. If the connection state DRX pattern cannot include the paging pattern, the terminal does not update the PF and PO. If the received DRX cycle is less than or equal to the paging cycle, then the PF and PO are not updated.

FIG. 10 illustrates a procedure S706 of recovering PF and PO when the UE receives DRX release in a connected state (eg, RRC_IDLE) 710 according to an embodiment of the present invention.

Referring to FIG. 10, a UE in a connected state may receive that DRX is released through DRX configuration information (eg, DRX-Config) (S1002). The terminal may calculate and store PF, PO, and T every time the system information is received (S1004). When the DRX is released, the terminal may recover the PF and the PO based on the most recently stored PF, PO, and T values (S1006).

11 illustrates a procedure (S708) of recovering PF and PO when the UE transitions from the connected state (eg, RRC_CONNECTED) 720 to the idle state (eg, RRC_IDLE) 710 according to an embodiment of the present invention. will be.

Referring to FIG. 11, when receiving a connection release message (eg, an RRCConnectionRelease message) from the base station, the terminal may enter the idle state 710 from the connection state 720 (S1102). As described above with reference to FIG. 10, the terminal may calculate and store PF, PO, and T every time system information is received (S1104). When the terminal leaves the connection state 720, the terminal may recover the PF, PO, and T based on the most recently stored PF, PO, and T.

12 illustrates a method 1200 of updating PF and PO in accordance with an embodiment of the present invention. The method 1200 may be applied to step S704 of FIG. 7 or step S906 of FIG. 9.

Referring to FIG. 12, in step S1202, the terminal may determine whether an on period of the DRX is greater than one radio frame length. For example, the length of the on period may be determined by on period information (eg, onDurationTimer) and the length of one radio frame may be 10 ms in the LTE system.

If the on period is more than one radio frame length, in step S1204, the terminal may determine whether a paging pattern determined by the paging configuration information may be included in the connection state DRX pattern determined by the DRX configuration information. That is, the terminal may determine whether the paging frame can be included in the on period of the connection state DRX cycle in the paging cycle. In one embodiment, the terminal determines whether there is n value that satisfies the equation (6) for this purpose.

In Equation 6, "DRX cycle start offset" represents a start position of a DRX cycle. For example, the start position of the DRX cycle may be determined by DRX cycle information (eg, longDRXstartoffset) received through the DRX configuration information. In some embodiments, other parameter names may be used to indicate the start offset of the DRX cycle. In addition, in Equation 6, “On duration length” represents an on interval length of a DRX cycle as illustrated above. As described above, the on interval length of the DRX cycle can be determined by onDurationTimer. Similarly, other parameter names may be used to indicate the on interval length of the DRX cycle, in accordance with an embodiment.

In step S1204, when there is an n value satisfying Equation 6, it means that a PF exists so that a paging pattern may be included in an on period of a DRX cycle. That is, in Equation 6, (T / N) × n × 10 indicates a paging frame position in a paging cycle in ms units. If there is an n value satisfying Equation 6, the paging frame may be located in a section corresponding to the length of the section from the start position of the DRX cycle and the start position of the DRX cycle. In Equation 6, since the on interval length is greater than one radio frame length, the paging position PO (or paging subframe) in the paging frame may not be considered in Equation 6. In addition, the updated paging frame may be different from the existing paging frame, and thus the updated paging position may also be different from the existing paging position. In addition, when there is an n value satisfying Equation 6, the n value may be different from an identifier of the UE included in the paging message. Therefore, in this case, the terminal may skip the process of receiving the paging message and checking whether there is an identifier thereof.

If there is no n value satisfying Equation 6 in step S1204, it means that the periodically repeated paging channel position cannot be included in the on interval of the periodically repeated DRX. Therefore, when there is no n value satisfying Equation 6, PF and PO are not updated (S1206). That is, the terminal receives the original position without changing the position of receiving the paging channel.

If there is an n value satisfying Equation 6 in step S1204, it means that a paging channel can be received within an ON period of DRX. If the value of n is n _i , the terminal may determine PF and PO based on Equations 7 based on Equations 3 to 5 (S1208). In one embodiment, if n is _i to determine a PF and a PO corresponding to a minimum of n _i if any plurality. The paging channel may be received in any subframe shown in Table 3 or Table 4 because the on interval length of the DRX cycle is greater than one radio frame length. For example, in the case of FDD, the UE may receive a paging channel in a certain subframe (eg, subframe 9 in Table 3) regardless of the Ns value. As another example, in case of TDD, the UE may receive a paging channel in a certain subframe (eg, subframe 0 in Table 4) regardless of the Ns value. Equation 7 reflects these examples.

If the on interval of the DRX cycle is smaller than one radio frame length in step S1202, in step S1210, the UE determines whether a paging pattern determined by the paging configuration information may be included in the connection state DRX pattern determined by the DRX configuration information. You can determine whether or not. That is, the terminal may determine whether the paging position of the paging frame can be included in the on period of the connection state DRX cycle in the paging cycle. In one embodiment, the terminal determines whether there is an n value and a PO value satisfying the equation (8) for this purpose.

As in Equation 6, "DRX cycle start offset" in Equation 8 represents the start position of the DRX cycle. For example, the start position of the DRX cycle may be determined by DRX cycle information (eg, longDRXstartoffset) received through the DRX configuration information. In some embodiments, other parameter names may be used to indicate the start offset of the DRX cycle. In addition, in Equation 8, "On duration length" represents an on interval length of a DRX cycle as illustrated above. Similarly, other parameter names may be used to indicate the on interval length of the DRX cycle, in accordance with an embodiment.

In step S1210, when there is an n value satisfying Equation 8, it means that the PF and PO exist so that the paging pattern may be included in the on period of the DRX cycle. That is, in Equation 8, (T / N) × n × 10 denotes a paging frame position in a paging cycle in ms units, and PO (k) denotes a paging position PO in a paging frame. Thus, (T / N) × n × 10 + PO (k) represents the paging position PO in the paging frame in one paging cycle. If there is an n value satisfying Equation 8, the paging position PO may be located within a section corresponding to the length of the section from the start position of the DRX cycle and the start position of the DRX cycle. In Equation 8, since the on interval length is less than one radio frame length, the paging position PO (or paging subframe) in the paging frame is additionally considered. In addition, when there is an n value satisfying Equation 8, the n value may be different from an identifier of the terminal included in the paging message. Therefore, in this case, the terminal may skip the process of receiving the paging message and checking whether there is an identifier thereof.

If there is no n value and a PO value satisfying Equation 8 in step S1210, it means that the periodically repeated paging channel position cannot be included in the on interval of the periodically repeated DRX. Therefore, when n value and PO value satisfying Equation 8 do not exist, PF and PO are not updated (S1212). That is, the terminal receives the original position without changing the position of receiving the paging channel. In this case, additional power consumption may occur for the paging channel.

If n and PO values satisfying Equation 8 exist in step S1210, it means that a paging channel can be received in a subframe within an on-period of DRX. If the value n is n _i , the terminal may determine PF and PO based on Equations 9 based on Equations 3 to 5 (S1214). In step S1214, unlike the step S1208, since the on interval of the DRX is not larger than one radio frame length, the paging channel may be received through one of the possible PO positions in the frame corresponding to the value of n _i . For example, the terminal may receive a paging channel in a subframe having the minimum value among possible PO positions. Equation 9 reflects this example.

13 illustrates an example of adjusting a paging cycle by updating PF and PO according to an embodiment of the present invention.

When the terminal enters the first network in the LTE system, the terminal may calculate the paging reception position of the terminal using system information and unique identification information (eg, IMSI) of each terminal. In general, since the UE maintains an active state in a connected state (eg, RRC_CONNECTED), even if a paging channel is received at an arbitrary paging reception location, no additional power consumption is required to receive the paging channel. However, when DRX is configured by the base station in the connected state, the terminal may switch the RF module according to the DRX cycle. That is, the terminal may remain in the on state during the on period given by the DRX configuration information and may be in the sleep mode in the remaining sections of the DRX cycle. At this time, the DRX cycle set by the base station and the paging cycle calculated by the terminal may not be aligned with each other. Therefore, the paging cycle may be located in the sleep period of the connected state DRX. In this case, since the terminal is in the sleep state and the RF module is turned on to receive the paging channel, power loss may occur.

However, as illustrated in FIG. 13, when a DRX cycle is set in a connected state (eg, RRC_CONNECTED) for a UE existing in the base station, the UE recognizes all possible paging cycle patterns at the current base station, If there are any paging cycles to match (i.e., n values for PF, PO), they can be applied to reduce the power consumed to turn on the RF module to decode the paging channel unnecessarily in the sleep period.

Therefore, the paging reception method proposed in the present invention can reduce power consumption of the terminal in a connected DRX environment while maintaining paging reception reliability. When the connection state DRX is set through the paging reception method according to an embodiment of the present invention, the paging reception position of the terminal is temporarily changed only in the connection state (eg, RRC_CONNECTED) to receive the paging channel unnecessarily in the sleep period of the connection state DRX. This eliminates the process of turning on the RF module in order to do so. This eliminates unnecessary power consumption in the sleep period of the connected state DRX and functionally maintains the paging reception reliability.

14 illustrates a base station and a terminal that can be applied to the present invention.

Referring to FIG. 14, a wireless communication system includes a base station (BS) 110 and a terminal (UE) 120. When the wireless communication system includes a relay, the base station or the terminal may be replaced with a relay.

Base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116. The processor 112 may be configured to implement the procedures and / or methods proposed in the present invention. The memory 114 is connected to the processor 112 and stores various information related to the operation of the processor 112. The RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal. The terminal 120 includes a processor 122, a memory 124, and a radio frequency unit 126. The processor 122 may be configured to implement the procedures and / or methods proposed by the present invention. The memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122. The RF unit 126 is connected with the processor 122 and transmits and / or receives a radio signal.

The detailed description set forth above in connection with the accompanying drawings is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In addition, specific terms used in the embodiments of the present invention are provided to help the understanding of the present invention, and the use of the specific terms may be changed to other forms without departing from the technical spirit of the present invention.

In addition, the embodiments described above are those in which the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

Certain operations described in this document as being performed by a base station may in some cases be performed by an upper node thereof. That is, it is obvious that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the embodiments of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (18)

A method for receiving a paging message at the terminal,
Receiving paging configuration information indicating a period of a paging cycle and a multiple parameter of the paging cycle and determining a first paging position of a first paging frame according to the paging configuration information;
Receiving DRX configuration information indicating a start position and an on interval length of a connected state Discontinuous Reception (DRX) cycle; And
Updating a first paging position of the first paging frame to a second paging position of a second paging frame included within an on period of the DRX cycle,
The updating step,
When the length of the on period of the DRX cycle is greater than or equal to one radio frame length, (start position of the DRX cycle ≤ (T / N) x n x 10 <start position of the DRX cycle + on period of the DRX cycle) Determining a paging frame (T / N) x n satisfying a length) as the second paging frame;
When the on-section length of the DRX cycle is smaller than one radio frame length, (start position of the DRX cycle ≤ (T / N) x n x 10 + PO (k) <starting position of the DRX cycle + the DRX cycle) Determining a paging frame (T / N) × n as the second paging frame,
PO (k) represents a paging position within the paging frame (T / N) × n, T is a period of the paging cycle, N is min (T, nB), and nB is a multiple parameter of the paging cycle, Way. delete delete The method of claim 1,
When the terminal is configured to operate in a frequency division duplex (FDD) and the on-section length of the DRX cycle is greater than or equal to one radio frame length, subframe 9 in the second paging frame is the second paging. Determined by location,
If the terminal is configured to operate in a time division duplex (TDD), and the length of the on-section of the DRX cycle is greater than or equal to one radio frame length, subframe 0 in the second paging frame is the second paging. Determined by location. delete delete The method of claim 1,
If the on-interval length of the DRX cycle is less than one radio frame length, a subframe corresponding to the minimum value of the PO (k) values in the second paging frame is determined as the second paging position. The method of claim 1,
And nB is one of 4T, 2T, T, T / 2, T / 4, T / 8, T / 16, T / 32. The method of claim 1,
Receiving the paging message at a second paging location of the second paging frame. In the terminal receiving the paging message,
RF (Radio Frequency) module; And a processor, wherein the processor
Receive paging configuration information indicating the cycle of the paging cycle and the multiple parameters of the paging cycle through the RF module and determines the first paging position (Paging Occasion) of the first paging frame according to the paging configuration information and,
Receive DRX configuration information indicating the start position and the on interval length of a connection state DRX cycle through the RF module,
And to update the first paging position of the first paging frame to a second paging position of a second paging frame included within an on period of the DRX cycle,
The updating is
When the length of the on period of the DRX cycle is greater than or equal to one radio frame length, (start position of the DRX cycle ≤ (T / N) x n x 10 <start position of the DRX cycle + on period of the DRX cycle) Determining a paging frame (T / N) x n satisfying a length) as the second paging frame;
When the on-section length of the DRX cycle is smaller than one radio frame length, (start position of the DRX cycle ≤ (T / N) x n x 10 + PO (k) <starting position of the DRX cycle + the DRX cycle) Determining a paging frame (T / N) × n as the second paging frame,
PO (k) represents a paging position within the paging frame (T / N) × n, T is a period of the paging cycle, N is min (T, nB), and nB is a multiple parameter of the paging cycle, Terminal. delete delete The method of claim 10,
When the terminal is configured to operate in a frequency division duplex (FDD) and the on-section length of the DRX cycle is greater than or equal to one radio frame length, subframe 9 in the second paging frame is the second paging. Determined by location,
If the terminal is configured to operate in a time division duplex (TDD), and the length of the on-section of the DRX cycle is greater than or equal to one radio frame length, subframe 0 in the second paging frame is the second paging. Terminal, determined by location. delete delete The method of claim 10,
When the on-interval length of the DRX cycle is less than one radio frame length, a subframe corresponding to the minimum value of the PO (k) values in the second paging frame is determined as the second paging position. The method of claim 10,
The nB is one of 4T, 2T, T, T / 2, T / 4, T / 8, T / 16, T / 32. The method of claim 10,
The processor is further configured to receive the paging message at a second paging location of the second paging frame.

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