CN112601274A

CN112601274A - Indication information detection method and equipment

Info

Publication number: CN112601274A
Application number: CN202110026264.4A
Authority: CN
Inventors: 孙霏菲; 付景兴; 苏迪
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2017-07-31
Filing date: 2017-11-28
Publication date: 2021-04-02
Anticipated expiration: 2037-11-28
Also published as: CN112601274B

Abstract

Disclosed are a method and apparatus for performing communication by a User Equipment (UE) in a wireless communication system, the method including: receiving configuration information including time domain information of indication information via higher layer signaling; identifying a time interval between the indication information and a position where the UE starts monitoring a first Physical Downlink Control Channel (PDCCH) in a Discontinuous Reception (DRX) time based on the time domain information; monitoring a second PDCCH on a search space of the second PDCCH for receiving the indication information, wherein a time domain location of the search space is determined based on the identified time interval; and identifying a wake-up indication included in the indication information in the second PDCCH.

Description

Indication information detection method and equipment

The application is a divisional application of an invention patent application with the application date of 2017, 11 and 28, and the application number of 201711218850.9, and the name of the invention is 'a detection method and equipment of indication information'.

Technical Field

The present invention relates to wireless communication systems, and more particularly, to a method and apparatus for detecting indication information.

Background

For internet of things (iot) terminals, power consumption and battery life are very important. In narrowband internet of things NB-iot (narrow band iot) or enhanced machine type communication emtc (enhanced machine type communication) systems, power saving of a terminal device may be achieved by configuring a power saving mode psm (power saving mode) or an extended discontinuous reception edrx (extended drx). However, during the sleep period in PSM or eDRX mode, the UE cannot listen to the paging message. For some internet of things applications, it is required that the UE can establish communication with the network within a certain time after receiving the network command. Then a UE with these requirements will not be able to configure into a mode with a longer periodic PSM or eDRX.

In the enhanced versions of Rel-15 NB-IoT and eMTC, to enable UEs to be paged and save power consumption, learning studies have been conducted to decide to introduce wake-up or sleep signals/channels. The wake-up signal/channel is used to wake up the UE, that is, the UE needs to continue to monitor the subsequent MPDCCH for indicating the paging message. The sleep signal/channel is used to indicate that the UE may enter a sleep state, i.e., the UE does not need to listen to the MPDCCH indicating a subsequent paging message.

In a multi-carrier system, the carrier carrying the synchronization signal is called the anchor carrier, and in Rel-13 the paging signal is transmitted on the anchor carrier. In the Rel-14 NB-IoT system, a method of transmitting paging messages on non-anchor carriers is introduced. In the eMTC system, a plurality of narrow bands (narrowbands) are defined, one of which has 6 PRBs, and a concept of a paging narrow band is introduced. In addition, in the eMTC system, the downlink control channel MPDCCH for MTC is used to indicate a paging message, and different UEs may monitor the MPDCCH on different narrow bands. Similarly, an ongoing new air interface nr (new radio) of 5G also exists in a scenario where the bandwidth of the UE is smaller than the system bandwidth, and a plurality of partial bandwidths (bandwidth parts) may also be defined for the paging channel. For this multi-carrier or narrowband or fractional bandwidth case, how to transmit and receive wake-up or sleep signals is a problem to be solved.

Disclosure of Invention

The application discloses a method for detecting indication information, which can effectively save electricity for equipment.

In order to achieve the purpose, the following technical scheme is adopted in the application:

a method for detecting indication information comprises the following steps:

determining the carrier/narrowband position and the time domain position of the indication information; the indication information is used for indicating whether the UE monitors the paging message or indicates a downlink control channel of the paging message at one or more paging moments PO;

and detecting the indication information at the determined carrier/narrowband position and time domain position, and determining whether to monitor the paging message or the downlink control channel on one or more POs according to the indication information.

Preferably, the determining the carrier/narrowband position where the indication information is located includes:

determining the carrier/narrowband position as a preset carrier/narrowband position;

alternatively, the first and second electrodes may be,

determining the carrier/narrowband location as: the carrier/narrowband where the paging message is located, or the carrier/narrowband where the downlink control channel is located;

alternatively, the first and second electrodes may be,

and determining the carrier/narrowband position according to the configuration information of the base station.

Preferably, the preset carrier location is an anchor carrier;

and/or the presence of a gas in the gas,

the determining the carrier/narrowband position according to the configuration information of the base station includes: determining whether the carrier/narrowband position is a preset carrier/narrowband or a paging message or a carrier/narrowband where the downlink control channel is located according to the configuration information; or, the carrier/narrowband position configured by the base station is used as the carrier/narrowband position where the indication information is located.

Preferably, the determining the time domain position where the indication information is located includes:

determining the time domain position according to the period of the indication information; and/or the presence of a gas in the gas,

and determining the position or the initial position of the downlink control channel or the paging message, and determining the time domain position according to the position or the initial position of the downlink control channel or the paging message.

Preferably, an indication message exists before each or a group of paging messages or each or a group of said downlink control channels; wherein, each of the indication information is used to indicate whether all UEs corresponding to one paging message or one downlink control channel perform the monitoring on the PO corresponding to the UE; or, each of the indication information is used to indicate whether all UEs corresponding to a group of paging messages or a group of downlink control channels perform the monitoring on a group of POs corresponding to the UE.

Preferably, there is more than one indication information before each paging message or each downlink control channel, where each indication information is used to indicate whether a part of UEs in a group of UEs corresponding to one paging message or one downlink control channel performs the monitoring on the POs corresponding to the part of UEs.

Preferably, an indication message exists before each paging radio frame; each piece of indication information is used for indicating whether all UE corresponding to one paging radio frame performs the monitoring on PO corresponding to the UE; or, each of the indication information is used to indicate whether all UEs corresponding to a group of paging radio frames perform the monitoring on the PO corresponding to the UE.

Preferably, more than one indication information exists before each paging radio frame, where each indication information is used to indicate whether a part of UEs in a group of UEs corresponding to one paging radio frame perform the monitoring on POs corresponding to the part of UEs.

Preferably, the time domain position of the indication information is a system frame, a subframe and/or a time slot occupied by the transmission of the indication information.

Preferably, the determining the time domain position according to the period of the indication information includes:

and determining the initial or end system frame SFN where the indication information is located according to the period of the indication information, and then determining the subframe position information of the indication information.

determining a starting or ending system frame SFN and/or a starting or ending subframe position of the indication information according to the period of the indication information;

or determining a starting or ending system frame SFN of the indication information according to the period of the indication information, then determining the positions of the indication information and a starting or ending sub-frame, and then determining the time domain position according to the starting or ending SFN and the positions of the starting or ending sub-frame;

or determining the SFN where the indication information is located according to the period of the indication information, then determining the subframe information actually occupied by the indication information, and determining the time domain position according to the SFN and the subframe information actually occupied;

or determining the indication information initial or end SFN according to the period of the indication information, then determining the initial or end subframe position of the indication information and the subframe information actually occupied by the indication information, and determining the time domain position according to the initial or end SFN, the initial or end subframe position and the subframe information actually occupied.

Preferably, the determining the start or end SFN where the indication information is located according to the period of the indication information includes: and determining the starting or ending SFN according to the period of the indication information and the offset configured by the base station.

Preferably, the determining the starting or ending subframe position of the indication information according to the period of the indication information comprises: and determining the position of the starting sub-frame or the ending frame according to the period of the indication information and the offset configured by the base station.

Preferably, the period of the indication information is determined according to a paging DRX period, or the period of the indication information and the paging DRX period are configured independently.

Preferably, the indicating information is used to indicate whether the UE listens to the paging message at one or more paging occasions PO or indicate a downlink control channel of the paging message, and includes: indication information located before any PO, having a distance from the PO satisfying a guard interval and being closest to the PO, for indicating whether the paging message or the downlink control channel exists on the PO or a plurality of subsequent POs.

Preferably, when the time domain position is determined according to the indication information, a time interval between the time domain position of the indication information and the PO position indicated by the indication information is greater than or equal to a set guard interval.

Preferably, the determining the time domain position according to the position where the downlink control channel or the paging message is located, or the starting position or the ending position includes:

determining the time domain position according to the position or the initial position of the downlink control channel or the paging message and the time domain resource information of the indication information; alternatively, the first and second electrodes may be,

and determining subframe position information of the indication information, and determining the time domain position according to the subframe position information and the position or the initial position of the downlink control channel or the paging message.

Preferably, the determining the time domain position according to the position or the initial position of the downlink control channel or the paging message includes:

determining the initial or end subframe position of the indication information, and determining the time domain position according to the position or initial position of the downlink control channel or paging message and the initial subframe position;

or, determining subframe information actually occupied by the indication information, and determining the time domain position according to the position or initial position where the downlink control channel or paging message is located and the subframe information actually occupied;

or, determining the starting or ending subframe position of the indication information and the subframe information actually occupied by the indication information, and determining the time domain position according to the position or starting position of the downlink control channel or the paging message, the starting or ending frame position and the subframe information actually occupied.

Preferably, the time domain resource information of the indication information includes one or more of the following information: the repetition times of the indication information, the duration occupied by the indication information, and the relative distance between the indication information and the position or the initial position of the downlink control channel or the paging message;

and/or the time domain resource information of the indication information is configured to the UE by the base station or is predefined.

Preferably, the number of repetitions of the indication information is determined according to an Rmax configured by a system, where the Rmax is a maximum number of repetitions of the downlink control channel search space.

Preferably, the number of repetitions of the indication information is determined according to a downlink measurement of the UE and/or a maximum number of repetitions of the indication information configured by the base station.

Preferably, the subframe position information of the indication information is a starting or ending subframe position of the indication information and/or subframe information actually occupied by the indication information.

Preferably, the determining the starting or ending subframe position of the indication information comprises: calculating the starting or ending subframe position according to a predefined rule; or the starting or ending subframe position of the indication information is a predefined subframe position or a subframe position configured by a base station.

Preferably, the subframe information actually occupied by the indication information is: a downlink available subframe, or a designated downlink unavailable subframe.

Preferably, the method further comprises: and when the UE has timing offset, calculating the detected SFN and the subframe number where the indication information is positioned, and performing timing synchronization again according to the calculated SFN and the subframe number.

Preferably, the method further comprises: according to the received channel or signal carrying the indication information, measuring an RSRP or RSRQ or RSSI channel state measurement value of a carrier/narrowband where the indication information is located;

and/or, the method further comprises: performing channel estimation on the carrier/narrowband where the indication information is according to the received indication information;

and/or, the method further comprises: and determining the carrier/narrowband position and the time domain position of the indication information of the adjacent cell, and determining the channel state of the adjacent cell according to the received indication information of the adjacent cell.

A detection apparatus of indication information, comprising: a determination unit and a detection unit;

the determining unit is used for determining the carrier/narrowband position and the time domain position where the indication information is located; the indication information is used for indicating whether the UE monitors the paging message or indicates a downlink control channel of the paging message at one or more paging moments PO;

and the detection unit is used for detecting the indication information on the determined carrier position and the determined time domain position.

According to the technical scheme, the carrier/narrow band position and the time domain position of the indication information are determined; the indication information is used to indicate whether the UE monitors the paging message or indicates a downlink control channel of the paging message at one or more paging occasions PO. And detecting indication information on the determined carrier wave position and time domain position, and determining whether to monitor the paging message or the downlink control channel on one or more POs according to the indication information. By introducing the indication information, the monitoring of the downlink control channel and the decoding of the paging message can be carried out only when needed without monitoring the downlink control channel all the time or decoding the paging message, thereby effectively realizing the electricity saving of the equipment.

A method of performing communication by a User Equipment (UE) in a wireless communication system, the method comprising: receiving configuration information including time domain information of indication information via higher layer signaling; identifying, based on the time indication information, a time interval between the indication information and a location where the UE starts monitoring a first Physical Downlink Control Channel (PDCCH) in a Discontinuous Reception (DRX) time; monitoring a second PDCCH on a search space of the second PDCCH for receiving the indication information, wherein a time domain location of the search space is determined based on the identified time interval; and identifying a wake-up indication included in the indication information in the second PDCCH.

A method of performing communication in a wireless communication system by a Base Station (BS), the method comprising: transmitting configuration information of time domain information including indication information to a User Equipment (UE) via higher layer signaling, wherein the indication information includes a wake-up indication; identifying, based on the time indication information, a time interval between the indication information and a location where the UE starts monitoring a first Physical Downlink Control Channel (PDCCH) in a Discontinuous Reception (DRX) time; transmitting the indication information to the UE via a second PDCCH on a search space of the second PDCCH, wherein a time domain location of the search space is determined based on the identified time interval.

A User Equipment (UE) that performs communication in a wireless communication system, the UE comprising: a transceiver; and a processor configured to: receiving, via the transceiver, configuration information including time domain information of indication information via higher layer signaling; identifying, based on the time indication information, a time interval between the indication information and a location where the UE starts to monitor a first physical downlink control channel, PDCCH, in a discontinuous reception, DRX, time period, monitoring a second PDCCH on a search space of the second PDCCH for receiving the indication information, based on the identified time interval, wherein a time domain location of the search space is determined based on the identified time interval, and identifying, in the second PDCCH, a wake-up indication included in the indication information.

A Base Station (BS) that performs communication in a wireless communication system, the BS comprising: a transceiver; and a processor configured to: transmitting, via the transceiver, configuration information including time domain information of indication information to a User Equipment (UE) via higher layer signaling, wherein the indication information includes a wake-up indication, based on the time indication information, identifying a time interval between the indication information and a location where the UE starts to monitor a first Physical Downlink Control Channel (PDCCH) in a Discontinuous Reception (DRX) time, and transmitting, via the transceiver, the indication information to the UE via a second PDCCH on a search space of the second PDCCH, wherein a time domain location of the search space is determined based on the identified time interval.

Drawings

FIG. 1 is a schematic diagram of a basic flow chart of an indication information detection method in the present application;

fig. 2 is a schematic diagram of a basic structure of an indication information detection device in the present application;

fig. 3 is a first diagram illustrating the determination of the carrier/narrowband position of the indication information;

fig. 4 is a diagram ii illustrating the determination of the carrier/narrowband position of the indication information;

FIG. 5 is a first schematic diagram illustrating the determination of the time domain position of the indication information according to the period of the indication information;

FIG. 6 is a second schematic diagram illustrating the determination of the time domain position of the indication information according to the period of the indication information;

FIG. 7 is a third schematic diagram illustrating the determination of the time domain position of the indication information according to the period of the indication information;

FIG. 8 is a first diagram illustrating the determination of the time domain location of the indication information according to the paging location A;

FIG. 9 is a second diagram illustrating the determination of the time domain location of the indication information according to the paging location A;

FIG. 10 is a third schematic diagram illustrating the determination of the time domain location of the indication information according to the paging location A;

FIG. 11 is a fourth schematic diagram illustrating the determination of the time domain location of the indication information according to the paging location A;

FIG. 12 is a fifth schematic diagram illustrating the determination of the time domain location of the indication information according to paging location A;

FIG. 13 is a sixth schematic view illustrating the determination of the time domain location of the indication information according to paging location A;

fig. 14 is a schematic diagram of an exemplary mobile communication network according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.

First, the relationship between the indication information and the paging signal in the present application is explained. In this application, information transmitted by the wake-up or sleep signal or channel mentioned in the foregoing background is referred to as indication information of the paging signal, and the indication information may be used to indicate whether a user equipment (herein, referred to as UE) needs to listen to a downlink control channel at one or more Paging Occasions (POs), or the indication information may also be used to indicate whether the UE needs to listen to a paging message at one or more POs. In this application, the indication information may be transmitted or carried in the form of a signal (e.g., a waveform, a sequence) or a channel (e.g., a downlink control channel, or a new synchronization channel). The downlink control channel is used to indicate a downlink data channel (PDSCH) carrying a paging message, and for different systems, the downlink control channel and the downlink data channel may be different specific channels. For example, a downlink data control channel (PDCCH), an enhanced downlink data control channel (EPDCCH), an MPDCCH, a narrowband downlink control channel NPDCCH, or a NR PDCCH, or a narrowband downlink control channel NPDSCH. The downlink control channel and the PDSCH may be on the same carrier or a narrow band, or may be on different carriers or narrow bands, the carrier or the narrow band transmitting the PDCCH or the PDSCH is called a paging carrier or a paging narrow band, and may be predefined in a standard or obtained by calculation according to a predefined method. Some parameters required in the calculation process can be configured through RRC. For the carrier or narrowband where the PDSCH is located, in addition to the above method, the carrier or narrowband may be further indicated by a DCI.

For different systems, the downlink control channel may be transmitted on a carrier or a narrowband. In an eMTC system, a concept of paging narrowband (paging narrowband) is introduced, a UE determines a narrowband where an MPDCCH is located according to the following formula (1), and the UE monitors the MPDCCH on the determined narrowband:

PNB＝floor(UE_ID/(N*Ns))mod Nn (1)

wherein:

n: number of paging frames in one DRX period

Ns: number of POs in one paging frame

Nn: number of pages of narrowband

Nb ═ N × Ns: number of POs in one DRX cycle.

UE _ ID/(N × Ns) ensures that PNB and pf (paging frame)/PO are uncorrelated.

In NB-IoT systems, downlink control channels are transmitted on carriers, further introducing weights on different paging carriers (carriers). The aim is to give the base station sufficient flexibility to adjust the paging load on each carrier. In particular, consider that Rel-13 NB-IoT UEs and Rel-14 UEs that do not support a non-anchor carrier (non-anchor carrier) can only receive paging channels from the anchor carrier (anchor carrier).

The minimum n in the following formula is a paging carrier monitored by the UE:

floor(UE_ID/(N*Ns))mod W<W(0)+W(1)+…+W(n) (2)

w (i) is a weight on NB-IoT carrier i, configured in the broadcast message by RRC, and is the sum of the weights of all paging carriers, that is, W (0) + W (1) + … + W (Nn-1), and Nn is the number of paging narrowband.

Fig. 1 is a general flow of a method for detecting indication information provided in the present application, and as shown in fig. 1, the method includes:

step 101, determining the carrier/narrowband position and the time domain position of the indication information.

Wherein, the indication information is used to indicate whether the UE needs to monitor the paging message or indicate a downlink control channel of the paging message on one or more POs.

Step 102, detecting the indication information at the determined carrier/narrowband position and time domain position, and determining whether to monitor the paging message or downlink control channel on one or more POs according to the indication information.

The application also provides a detection device of the indication information, which can be used for implementing the method. Fig. 2 is a schematic diagram of the basic structure of the detection apparatus. As shown in fig. 2, the apparatus includes a determination unit and a detection unit.

The determining unit is used for determining the carrier/narrowband position and the time domain position where the indication information is located. And the detection unit is used for detecting the indication information on the determined carrier/narrowband position and time domain position and determining whether to monitor the paging message or the downlink control channel on one or more POs according to the indication information.

The above-described detection method and detection apparatus are described in detail below.

First, how to determine the carrier/narrowband position of the indication information is described.

The method comprises the following steps: the carrier/narrowband position of the indication information is predefined, and the UE monitors the indication information on the predefined carrier/narrowband.

Wherein the predefined carrier may be an anchor carrier.

The second method comprises the following steps: the indication information is transmitted on the carrier/narrowband on which the paging message or downlink control channel (e.g., PDCCH) is located. The UE may obtain the configuration information of the carrier/narrowband where the transmission indication paging message is located through higher layer signaling (e.g., SIB or UE-specific RRC message), so as to determine the carrier/narrowband location of the indication information. In addition, the UE may obtain the carrier on which the paging message is located through a physical layer indication (e.g., PDCCH).

The third method comprises the following steps: and determining the carrier/narrowband position of the indication information according to the configuration information of the base station. For example, the UE is informed of the indication information transmitted on a specific carrier/narrowband among the plurality of carriers/narrowbands through the configuration information of the base station. Wherein the designated carrier/narrowband can be one or more carriers/narrowbands. Or, for example, the UE is notified of the carrier/narrowband position of the indication information by the configuration information of the base station in the manner of the above-mentioned method one or method two. Preferably, whether to monitor the indication information only on the anchor carrier or whether to monitor the indication information on the non-anchor carrier may be configured through higher layer signaling. The configuration method and the calculation method thereof can refer to the mode of multi-carrier paging in NB-IoT or eMTC. In addition, the configuration mode can be subordinate to or independent of the configuration mode of the multi-carrier paging.

The carrier/narrowband location determined in the manner described above may be on one or more carriers/narrowband. The indication information may indicate whether there is downlink control channel transmission or paging message transmission in the PO on multiple carriers/narrowbands or one carrier/narrowband. For example, the scheduling information of the PDSCH for carrying the paging message is configured to the UE in a semi-persistent scheduling manner, or is predefined in the protocol, in which case, the indication information may indicate whether there is a paging message transmission in a PO on multiple carriers/narrowbands or one carrier/narrowband; when the scheduling information of the PDSCH for carrying the paging message is sent to the UE through the downlink control channel, the indication information may indicate whether there is a downlink control channel transmission in the POs on multiple carriers/narrowbands or one carrier/narrowband. Wherein the scheduling information of the PDSCH may include one or more of the following information: code modulation mode, transmission block size, time frequency resource position, etc. The indication information may indicate whether one UE or a group of UEs or all UEs need to continue to monitor the downlink control channel.

When the indication information is transmitted on only one carrier (e.g., an anchor carrier), after detecting the information, if the UE needs to continue monitoring the paging message or the downlink control channel on the corresponding PO, the UE may continue monitoring the paging message or the downlink control channel on the same carrier or on a different carrier.

Several specific examples are given below.

In a first example, a carrier/narrowband position of indication information is determined by using the first method, where the indication information is used to indicate whether to detect a PDSCH carrying a paging message on one or more POs and/or indicate a downlink control channel (in the following examples, all are PDCCHs) of scheduling information thereof. Specifically, as shown in fig. 3, each UE acquires configuration information of a paging carrier or a paging narrowband, and determines that the indication information is transmitted on a predefined carrier 1 (for example, the carrier 1 is an anchor carrier). At this time, each UE will monitor the indication information 1 and the indication information 2 corresponding to the next period on the carrier 1. If the indication information 1 indicates that there is PDCCH or PDSCH transmission at the corresponding PO, the UE continues to monitor the PDCCH or attempts to decode the PDSCH according to the rule of the PO. If the indication information 1 indicates that no PDCCH or PDSCH is transmitted in the corresponding PO, the UE does not monitor the PDCCH or decoded PDSCH of the corresponding PO, and continues to detect the indication information on the time-frequency resource location of the next indication information 2. In the first period, if there is a PDCCH for indicating a paging message or a PDSCH carrying a paging channel on a PO of the UEs 1 to 3, the base station indicates that there is a PDCCH or PDSCH transmission on the corresponding PO using indication information 1. From the UE perspective, after detecting the indication information 1, the UE then continues to monitor the PDCCH or attempt to decode the PDSCH on the corresponding PO. More specifically, when the POs of the UE1 and the UE2 are on the carrier 1, the UEs 1 and 2 will continue to monitor their respective POs on the carrier 1, and the PO of the UE3 is on the second carrier, after detecting the indication information 1 on the carrier 1, the UE3 monitors the PDCCH indicating the paging signal on the corresponding PO of the carrier 2 or decodes the PDSCH on the semi-persistent scheduled resource. If the UE is a narrowband UE, such as NB-IoT UE, eMTC UE or a narrowband UE in NR system, the UE re-tunes the center frequency (tuning) to the carrier (e.g. carrier 2) where its PO is located, and continues to monitor PDCCH or attempt to decode PDSCH.

Note that in this case, from the perspective of the base station, if there is a paging message or downlink control channel transmission indicating a paging message on one of the POs associated with one indication information in one DRX cycle, the indication information will be transmitted, and all UEs will be woken up. In other words, even if the UE detects the indication information, the UE does not necessarily detect the downlink control channel (e.g., PDCCH) or successfully decode the PDSCH.

In the second embodiment, the carrier/narrowband position of the indication information is determined by the second method, and the indication information is used to indicate whether a downlink control channel indicating the PDSCH or a PDSCH carrying a paging message exists on one or more POs. Specifically, as shown in fig. 4, the UE acquires configuration information of a paging carrier or a paging narrowband; it is determined that the indication information is transmitted on a paging carrier. It is assumed that indication information 1 and indication information 3 are transmitted on two carriers, carrier 1 and carrier 2, respectively. The paging carrier for UE1 and UE2 is carrier 1 and the paging carrier for UE3 is carrier 2. At this time, the UE1 and the UE2 monitor the indicator 1 and the indicator 2 corresponding to the next indicator period on the carrier 1, and the UE3 monitors the indicator 3 on the carrier 2. In one example, different carriers have different indicator/channel cycles, e.g., the indicator cycle on carrier 1 coincides with the DRX cycle, while the indicator cycle on carrier 2 is an integer multiple of the DRX cycle, e.g., 2 times. If the indication information indicates that there is PDCCH transmission or PDSCH transmission carrying a paging channel at the corresponding PO, the UE continues to monitor the PDCCH or tries to decode the PDSCH according to the rule of the PO. Similarly, in the first DRX cycle on the carrier 1, the UE1, the PO of the UE2 only needs to have one PDCCH transmission for indicating paging messages or one PDSCH transmission for carrying paging channels, and the base station indicates on the indication information 1 that there is a PDCCH transmission or a PDSCH transmission for carrying paging channels on the corresponding PO. From the UE perspective, after detecting the indication on the indication information 1, the UE continues to monitor the downlink control channel on its corresponding PO or attempts to decode the PDSCH on the pre-allocated resource. The UE3 listens for indication information 3 on carrier 2. In one example, the period of the indication information 3 is longer, for example, there are two DRX periods, and the indication information 3 indicates whether there is PDCCH or PDSCH decoding in 2 POs in the period, at this time, if the UE3 detects the indication information indicating that there is PDCCH transmission in the corresponding PO or PDSCH transmission carrying paging message on the semi-persistent scheduling resource, it needs to detect two POs in its period, and conversely, if the detected indication information indicates that there is no PDCCH or PDSCH transmission in the corresponding PO, the UE3 will not need to monitor PDCCH detection of the corresponding POs or attempt to decode PDSCH.

For a system supporting multi-narrowband/carrier paging, a base station may configure, for each carrier, information related to indication information, such as one or more of configuration information of a period, an offset used for determining a time domain position, a transmission duration, a repetition number, an available subframe, and the like.

Next, how to determine the time-domain position of the indication information is described.

The time domain position of the indication information may be determined according to one of the following information:

A. a period of the indication information;

B. each UE or a group of UEs indicates the location or starting location (hereinafter referred to as paging location a) where the downlink control channel of the paging message or the PDSCH carrying the paging message is located.

Where paging location a for each UE is a determined location corresponding to a unique SFN and subframe. In more detail, if the PDSCH is scheduled by a downlink control channel, the paging location a herein refers to a location or a starting location of the downlink control channel indicating a paging message; if the PDSCH is semi-persistent scheduling, the paging location a here refers to the location or starting location of the PDSCH carrying the paging message. When the downlink control channel for indicating the paging message or the PDSCH for carrying the paging message is not repeatedly sent, the paging position A is the position of the downlink control channel for indicating the paging message or the PDSCH for carrying the paging message; when the downlink control channel for indicating the paging message or the PDSCH for carrying the paging message is repeatedly transmitted, the paging location a is the starting location where the downlink control channel for indicating the paging message or the PDSCH for carrying the paging message is located.

The base station may configure different methods to determine the location of the indication information according to different requirements and scenarios.

The time domain position refers to position information of the indication information in the time domain, and may be a system frame position and a subframe position, or may be a slot position. The following description will be made taking a system frame position and a subframe position as an example.

For a, the base station may configure a period of the indication information, and the UE calculates a System Frame Number (SFN) where the indication information is located according to the period of the indication information, and then determines subframe location information and symbol location information where the indication information is located. And determining the accurate position of the indication information by combining the SFN, the subframe position information and the symbol position information.

As shown in fig. 5, the period of the indication information may be related to the DRX cycle of the paging (e.g., one or several times or a fraction of the DRX cycle is determined by the DRX cycle) or unrelated (the period of the indication information and the period of the DRX are configured independently).

Specifically, the method of calculating the indication information system frame may multiplex the existing manner of determining the paging frame, i.e., calculate according to the UE ID. For example, the SFN satisfying SFN mod T2 ═ (T2 div N) × (UE _ ID mod N2) is the system frame of the indication information, where T2 is the period of the indication information (which may be configured by the base station), and N2 is the minimum value of the periods T2 and nB 2. Wherein nB2 is a parameter configured at a high level, for example, nB2 may take the following values: 4T2,2T2, T2, T2/2, T2/4, T2/8, T2/16, T2/32, T2/64, T2/128, T2/256, T2/512, and T21024. In one indication information period T2, each UE has a different UE ID, and the indication information corresponds to a different SFN or subframe. As shown in fig. 5, in one period of the indication information, different UEs may obtain the time domain position of the indication information 2 and the time domain position of the indication information 3. Preferably, the method of computing the indication information system frame may be independent of the UE ID, such as SFN mod T2 ═ 0. Further, when the system frame where the indication information is located is calculated, the calculation may be performed according to a start offset of the system configuration. The starting offset may be cell-specific, or user group-specific. For example, an SFN satisfying SFN mod T2 — offset is a system frame of the indication information. The offset is a starting offset, and may be specifically obtained by eNB (e.g. RRC) configuration, or may be predefined, or may be calculated by UE _ ID, and/or carrier/narrowband ID, and the like. The particular offset is 0, or T2-1 or T2-M, where M is a base station configured value. M may be a Duration of actual indication information transmission (Duration) or a Duration of actual indication information transmission plus a guard interval. Thus, M may be inferred from the transmission duration and/or guard interval of the indication information. In this method, each period T2 has a corresponding indication, as shown by indication 1 in fig. 5. As another example, in fig. 6, the period T2 of the indication information is the same as the paging DRX period T. It is convenient to define the transmission pattern with the absolute SFN and/or subframe number at this point. In one DRX cycle, PO (SFN and subframe number) of different UEs may be different, such as PO of UE1 and UE2, but both are indicated by the same indication information within one DRX cycle, i.e. indication information cycle. The offset can also be combined with the first way to determine the system frame in which the indication information is located. Specifically, the offset value may be shifted by one on the basis of the SFN calculated in the first manner. For example, SFN mod T2 ═ offset + (T2 div N) × (UE _ ID mod N2) or SFN mod T2 ═(T2 div N) — (UE _ ID mod N2) -offset.

By the above method, the starting system frame SFN where the indication information is located can be determined according to the period of the indication information. In a specific implementation, after determining other system frames in which the indication information is located, the subframe location in which the indication information is located may be determined in a subsequent B mode, and a specific processing mode is introduced in the B mode.

In order to keep the complexity of the terminal low, a certain time needs to be reserved between the indication information and the paging location a, i.e. PO for the UE to detect the indication information. Then for the indication information having no time interval with the PO, the UE cannot quickly determine whether the PO immediately following the indication information has a downlink control channel or a downlink data channel carrying paging information, where the PO may be defined as being indicated by the previous indication information (i.e., the PO closest to the PO and satisfying the guard interval). As shown in fig. 7, since there is not enough Guard time (GP) between the indication information 2 and the paging location a1, whether there is a PDCCH in the paging location a1 is indicated by the previous indication information 1.

In case a, the SFN in which the instruction information is located is determined. The manner of determining the subframe position information and the symbol position information of the indication information will be described later.

For B, the UE may determine the paging location a (SFN and subframe) by using the prior art, and then determine the time domain location of the indication information according to the time domain resource information of the indication information, or further according to the subframe location information of the indication information. As shown in fig. 8, the base station sends an indication message before each paging message or downlink control channel indicating the paging message. As shown in fig. 8, UE1 and UE2 respectively calculate paging location a, i.e. PO, according to predefined criteria and configured parameters, where indication information 1 and indication information 3 are applicable to UE1, and indication information 2 and indication information 4 are applicable to UE 2.

Preferably, there are two specific treatment modes:

determining time domain resource information of the indication information, and determining a time domain position of the indication information according to the paging position A and the time domain resource information of the indication information.

Specifically, the time domain resource information of the indication information may be: the number of repetitions of the indication information (repetition) and/or the length of time the indication information occupies, and/or the time interval between the indication information and the paging location a. The time domain resource information may be configured by the base station or predefined in a protocol. In more detail, when the time domain position of the indication information is determined according to the time domain resource information of the indication information and the paging position a, the time domain position of the indication information can be determined by combining the repetition times of the indication information, the occupied time length and the time interval between the indication information and the paging position a; or, when there is no time interval between the indication information and the paging location a, the time domain location where the indication information is located may be determined only according to the number of repetitions of the indication information and the time length occupied by the indication information. The time interval between the indication information and the paging location a may be the number of downlink available subframes or the absolute number of subframes, or the number of downlink available subframes plus an absolute subframe (time). Further, a subframe may be a slot or other unit of time.

In addition, the number of repetitions of the indication information in the time domain resource information may be estimated from a maximum number of repetitions Rmax in a PDCCH search space indicating a paging channel. For example, the number of repetitions of the predefined indication information is equal to Rmax, or equal to Rmax/X, where X may be predefined, for example, defined in a standard. X may also be configured by the base station. In addition, the UE may need to listen to one or more channels or signals carrying indication information with possible repetition times, the repetition times it needs to listen to, or the maximum repetition times may be configured by the base station or specified in the protocol. The specific design may refer to the design of MPDCCH or NPDCCH search space. Then the starting position of its indication information can be decided by the maximum number of repetitions. Different starting points can be found according to different repetition times.

And secondly, determining subframe position information of the indication information, and determining the time domain position of the indication information according to the subframe position information and the paging position A.

Here, it should be noted that, in the above-mentioned a scheme, the subframe position information of the instruction information needs to be specified, and in the second scheme, the subframe position information may be the same as the subframe position information in the above-mentioned a scheme, and the specification method may be the same. Therefore, the following description is made together.

Specifically, the subframe position information of the indication information may include a start subframe position of the indication information and/or actually occupied subframe information.

When the subframe position information of the indication information includes the starting subframe position, the following several ways may be adopted to determine:

1. and calculating the initial subframe position of the indication information according to a predefined rule.

The UE may directly calculate the starting subframe location for transmitting the indication information through a predefined rule. Specifically, the method of paging subframes in LTE may be followed, that is, by a UE ID and N2 ═ min (T2, nB2), and predefined voting, specifically: i _ s2 floor (UE _ ID/N2) mod Ns 2. Where T2 is an indication information period, nB2 is a parameter configured by a higher layer, and Ns2 is max (1, nB 2/T2).

An example of a predefined table is:

Ns2	when i_s2＝0	when i_s2＝1	when i_s2＝2	when i_s2＝3
					1	9	N/A	N/A	N/A
2	3	8	N/A	N/A
					4	9	3	4	9

in one example, the table indicates the previous or x subframes (x is a predefined integer) of the paging subframe table in LTE.

2. The starting subframe position of the indication information is determined according to a predefined or RRC configuration.

Pre-defining: for example, the starting subframe location is fixed to one or more subframes, e.g., fixed to subframe 9 every odd frame (avoiding NSSS in NB-IoT systems), or fixed to subframes 3,4,9, or the first subframe of each SFN, i.e., subframe 0.

RRC configuration: the base station may specifically configure the subframe number. Its specific subframe number may be the indicated starting subframe position. The actual occupied subframe position may be from the starting position to N 'available subframes, or N' consecutive subframes, or N 'specific pointers, where N' is the number of subframes occupied by the transmission indication information, or the number of repetitions.

After the initial subframe position is determined by the above method, for the method a, the time domain position of the indication information can be determined by combining the SFN and the initial subframe position; for the mode B, the paging location a and the starting subframe location may be combined to determine the time domain location of the indication information, for example, a starting subframe location which is closest to the paging location a before the paging location a and can complete the transmission of the indication information with the downlink control channel or the starting subframe of the PDSCH carrying the paging message is used as the starting subframe location of the indication information.

3. The SFN and the subframe position of the start position of the transmission indication information can be directly determined according to the period of the indication information.

For example

Or

Or

Wherein n is_fIs an index of SFN, n_sIs a slot index, i.e.

Is a subframe index. In the above formula, the first and second carbon atoms are,the offset value may be a value independently configured by the base station or calculated from time domain resource information of the root indication information. For example: the offset may be the sum of the transmission duration (including the number of repetitions) and the interval between the indication information and the paging location a, and further may be calculated from the available subframes. The way of calculating the subframe start position here is applicable only to the way a, and not to the way B.

The subframe location information of the indication information may further include subframe information actually occupied by the indication information. When the indication information is transmitted, it may need to repeat multiple transmissions, and in the process of repeated transmission, some subframes may not be used for transmitting the indication information, so in some cases, subframe information actually occupied by the indication information needs to be determined to finally determine a time domain position occupied by the indication information.

Specifically, the subframe information actually occupied may refer to: the indication information only occupies the available subframes of the downlink, or the indication information only can occupy the partial designated unavailable subframes of the downlink.

The definition of the downlink available subframe may adopt an existing definition. For example, in an NB-IoT system, the downlink available subframes are defined as:

(a) the subframe is not used for NPSS/NSSS/NPBCH/NB-SIB1 transmission, and for transmission of other SIBs

(b) For the anchor carrier, after the UE receives the system information SIB1, the subframe is configured as an NB-IoT downlink subframe, i.e., an available subframe

(c) For a non-anchor carrier, the subframe is configured by higher layer signaling as an NB-IoT downlink subframe, i.e., an available subframe, for the non-anchor carrier.

Based on the above definition, the indication information is transmitted only in the downlink available subframe, which may specifically be: (ii) satisfies (a) + (b) at an anchor carrier, or (c) at a non-anchor carrier; or, the indication information is transmitted only in the partially unavailable subframes in the downlink, and specifically, the indication information may be: the indication information is transmitted on a subframe in which the anchor carrier satisfies (a) but is configured as a non-available (invalid) subframe, or the indication information is transmitted on a subframe in which the non-anchor carrier is configured as a non-available subframe.

The advantage of transmitting the indication information in the partially unavailable subframe in the downlink is that the potential collision between the transmission of other signals of the UE of the previous version (note: the transmission of the indication information is not known by the UE of the previous version) and the transmission of new indication information can be effectively avoided. This method is more suitable for the case of connected mode.

When the time domain position of the indication information is determined according to the paging position a in the above manner B, it is mentioned that before each paging position a, there is an indication information for indicating whether to monitor at the corresponding position. Specifically, the above situation may be that one indication information indicates whether UEs corresponding to one paging location a need to monitor, or may also be that one indication information indicates whether UEs corresponding to a group of paging locations a need to monitor, or may also be that one indication information indicates whether some UEs in all UEs corresponding to one paging location a need to monitor. Such a case is described in detail below.

As shown in fig. 6, it can also be implemented in the B method, for example, the PO of each group of UEs (including UE1 and UE2) is preceded by an indication message, and its position a is determined according to the position of the PO of the first UE in the group of UEs, i.e., UE 1. At this time, the first UE in a group of UEs may calculate by starting from SFN ═ 0. The UE closest to SFN ═ 0 is the first UE. Specifically, the UEs may be re-divided into Y groups, each group corresponding to one indication information. For the case of configuring only one carrier, when Y ═ Ns (where N × Ns denotes the number of POs in each DRX cycle), that is, there is an indication signal before each PO; when Y > N × Ns, the number of indication information is greater than the number of POs in the DRX cycle, that is, multiple indication information corresponds to one PO, and therefore, the UEs in each PO need to be further grouped; when Y < N × Ns, it means that a plurality of POs correspond to one indication information in one DRX cycle. Specifically, when Y is 1, that is, there is only one indication information per DRX cycle, which is used to indicate UEs on all the carriers. For the case of Y > N × Ns, the time domain position of the indicator signal may be determined in a manner described later in which the UEs are further grouped.

For Ns >1, it may be difficult to find the position of the indicator signal before each PO, in which case the above-mentioned PO may be replaced by a PF, and then the number of PFs in each DRX cycle replaces the number of POs N × Ns in the above calculation. For example, when the system configures the parameter nB > T of DRX, one indication information may be used to indicate UEs of a plurality of POs in one PF.

In one example, if Ns is 1, for the case that Y is less than N, the UEs of multiple POs need to find the location of the same indication information. The specific implementation method comprises the following steps:

the group number Y of the indication information is UE _ ID mod Y.

The position of one PF closest to the indication information is (T div N) × (UE _ ID mod N)/(Y/N)) × (Y/N). The location of the first PO of the PF is paging location a. The determination of the time domain position of the indication information may continue as follows.

For the mode a, the SFN, the starting subframe position of the indication information, and the actually occupied subframe information may be combined to determine the time domain position of the indication information. For the mode B, the time domain position of the indication information may be determined by combining the paging position a and the subframe information actually occupied, or the time domain position of the indication information may be determined by combining the paging position a, the starting subframe position of the indication information, and the subframe information actually occupied.

Two specific examples of determining the time domain location of the indication information according to the paging location a are given below. As shown in fig. 9, the UE determines a paging location a, that is, an SFN and a subframe where the PO is located, for example, the SFN is m, the subframe k, and the PO is the starting location of the paging location a when there is a repetition in the downlink control channel indicating the paging message or the downlink data channel carrying the paging message. Then, the UE determines the starting subframe of the indication information to be subframe k-N according to the number N of subframes occupied by the indication information or the interval between the starting subframe of the indication information and the paging location a. In practice, the actual subframe number range may only be 0 to 9, and then the SFN needs to be introduced for calculation. For example, the PO is located at SFN — m subframe number k, where k is 0, …, 9. The start position of the indication signal/channel is SFN-m-floor (N/10) and the subframe number is k-N mod 10. The number N of subframes occupied by the indication information may be configured for the base station, or predefined in a standard.

As shown in fig. 10, the UE determines a paging location a, that is, SFN N and subframe k where PO is located, and determines the starting subframe of the indication information to be subframe M according to the number N of subframes occupied by the indication information or the interval M between the starting subframe of the indication information and the paging location a. In one example, there are N available subframes in m through k. In addition, in order to guarantee low complexity of the UE, and guarantee that the UE can determine whether the PDCCH needs to be decoded when the PO arrives, a guard time for decoding, for example, a time of one subframe or a time of several symbols, can be reserved between the indication information (the end position in the case where there is repetition) and the paging position a. Especially, when different hardware units are adopted for PDCCH decoding and indication information detection, a certain time needs to be reserved to wake up a new hardware unit.

For TDD systems, the indication information may be transmitted in the downlink portion of the special subframe (DwPTS). Only a partial signal may be transmitted at DwPTS with respect to a full subframe. It is also possible to puncture (punture) or RE-rate match (rate matching) for available REs.

If the UE is in an idle State, the CSI-RS (channel State Information Reference signal) or the PRS (position Reference signal) is not visible (transient) to the UE, i.e., the UE may assume that there is no transmission of the CSI-RS and PRS. From the perspective of the base station, when the CSI-RS and the indicator channel/signal are transmitted in the same time-frequency resource location, the indicator channel/signal is punctured, that is, the indicator channel/signal is not transmitted by the transmitting CSI-RS. In addition, the base station may avoid transmission of CSI-RS or PRS by scheduling, e.g., by configuring downlink available subframes. If the UE is in a linked state, the UE may consider a subframe configuring the PRS or CSI-RS as an unavailable subframe. Or the UE considers that the indication channel/signal can punch or rate match the CSI-RS, thereby ensuring the performance.

After determining the subframe position in the above manner, further, the UE determines the position of the symbol where the indication information is located.

Preferably, the symbol may be predefined: e.g., all symbols within a subframe, or the first three OFDM symbols within a subframe. Due to the NB-IoT system, independent deployment mode (standby mode), the first three OFDM symbols of anchor carrier subframes 0,5,9 (even frame) are idle. Thus, the three OFDM symbols may be used to transmit the indication information/channel.

The above provides a way to determine the time domain position of the indication information. Further, with the location information as the above indication information, when the UE timing is offset (out of synchronization), the values of the SFN, the subframe, and the symbol can be obtained by detecting the indication information. For example, if the UE knows that the indication information is transmitted at the location of subframe 0 where SFN mod 256 ═ 0. After the UE is out of sync, the location where the indication information is successfully detected can be set to the SFN in the UE memory and/or the value of the subframe that is the most recent. Such as SFN-0 and the location of subframe 0. That is, the UE can re-perform timing synchronization through the indication information and a time-dependent counter in the UE memory.

When indicating information Resource Element (RE) mapping, pilot signals, such as CRS of LTE system or NRS of NB-IoT system, need to be avoided. Since in NB-IoT idle state, anchor carrier specific subframes, and non-anchor carriers, the presence of NRS needs to be assumed on the first few subframes of each PO and the presence of NRS need not be assumed on other subframes. At this time, the indication information may be mapped on the REs that originally transmitted the NRS, i.e., transmission assuming no NRS. In this case, the correlation of the sequences can be better maintained, and the detection performance can be improved. When the transmission format of the indication information is a channel, it is necessary to assume that NRS exists in the transmission subframe, and the UE needs to perform channel estimation and decoding of the indication channel through NRS. Further, the UE may assume that several subframes exist before the subframe indicating channel transmission, and may perform frequency offset estimation and the like through NRS.

For the NB-IoT system, the UE may decide mobility in idle state, such as cell attachment or reselection, through channel state indicators such as RSRP and/or RSRQ and/or RSSI of the anchor carrier. If the UE only needs to monitor the indication information or channel at the anchor carrier, the channel state of RSRP of the carrier can be easily obtained. In particular, due to the limitation of the RF capability of the base station, power boosting may be performed only on the anchor carrier, and if all UEs monitor the indication information on the anchor carrier, the same mobility management criteria, such as the same RSRP threshold, may be used for cell attachment or reselection. For example, in NB-IoT systems, idle-state mobility management is decided according to the channel state of the anchor carrier. Similarly, the indication information may be used in eMTC, NR, LTE, or other communication systems. On the other hand, since Power boosting can be performed on the anchor carrier/narrowband, the performance of the indication information signal of the anchor carrier/narrowband may be better than that of the non-anchor carrier/narrowband, and if the anchor carrier/narrowband can perform Power boosting of 6dB, the required transmission duration (or repetition number, or occupied time-frequency domain resource, or sequence length) of the indication information may be shorter, such as only 1/4 length is required. This is more advantageous for the UE's power saving. However, an indication message of this method would indicate whether there is a paging message on multiple carriers, and if the paging traffic of this cell is busy, the UE would be frequently woken up, and would lose the meaning of power saving. In case of heavy paging traffic, the indication information/channel may be transmitted separately on each carrier indicating whether or not there is a paging message. Preferably, the base station may configure the periodicity (frequency) of the indication information/channel. When the paging service is not busy, a longer period may be configured, and when the paging service is busy, a shorter period may be configured, and even further, the indication information groups the UEs of the same PO according to the UE ID, that is, as described above, when the number Y of the grouped UEs is greater than N × Ns, it indicates that a plurality of indication information correspond to one PO location, and therefore, the UEs in the same PO may be further grouped. For example, as shown in fig. 11, UEs of the same PO are further divided into 2 groups according to the UE IDs, and the groups correspond to the indication information 1 and the indication information 2, respectively. And the UE calculates corresponding indication information according to the UE ID.

The base station may configure multiple sets of time domain resource information of the indication information, for example, a repetition number (repetition) of the indication information, and/or a time length occupied by the indication information, and/or a time interval between the indication information and the paging location a, etc., respectively. As shown in fig. 11, the UE infers the positions of the indication information 1 and the indication information 2 from the time domain resource information of the two sets of indication information. Specifically, for indication information 1, { transmission duration 1, interval 1 from location a } is configured; for indication 2, the { transmission duration 2, interval 2 from location a } is configured. The UE determines a start position 1 of the indication information 1 or a start position 2 of the indication information 2 according to the position a (i.e. the position of the PO), and the interval and the transmission duration with the position a. Since the UE may have a certain time offset from the base station when waking up from IDLE state, an interval is needed between two adjacent sets of indication information in order to avoid detecting the indication signals of other POs. Alternatively, at least every adjacent two sets of indication information adopt different sequences to reduce the false alarm probability. In another example, the start position of the indication information 1 may be decided according to an interval between the indication information 2 and PO, a transmission time period of the indication information 2, an interval between the indication information 1 and the indication information 2, and a transmission time period of the indication information 1. But this method is more complicated than the former method.

In addition, the methods for deciding the time domain position of the indication signal described above can be applied to the case of grouping UEs further by configuring the UEs in multiple groups by the base station.

In LTE, eMTC or NB-IoT systems, as mentioned above, the UE calculates the PF and PO, i.e. the paging location a described herein, according to the parameters (DRX cycle, NB) configured by the base station.

PF is the SFN satisfying SFN mod T ═ T div N (UE _ ID mod N). Where N is min (T, nB), T is a DTX period, and nB is an RRC parameter configured by the base station.

PO is i _ s satisfying i _ s floor (UE _ ID/N) mod Ns, and Ns max (1, nB/T), and then PO is obtained by table lookup.

As mentioned earlier, in order to reduce the probability of a UE being woken up (due to paging other UEs), UEs belonging to one PO may be further grouped into M groups. The UE may determine the group m to which the UE belongs according to the configuration of the base station, and then determine the time domain resource location of the indication signal according to the method. For example, the number of groups may be decided according to the UE ID: m ═ floor (UE _ ID/Ns) mod M. Specifically, as shown in fig. 11, if M is 2 and N is 4, then a UE with UE ID 0 belongs to the first group of PO1, a UE with UE ID 4 belongs to the second group of PO1, a UE with UE ID 1 belongs to the first group of PO2, a UE with UE ID 5 belongs to the second group of PO2, and so on.

For systems supporting multiple carriers/narrowband, for example:

for the eMTC system, PNB is floor (UE _ ID/(N × Ns)) mod Nn, where PNB is the serial number of the narrowband and Nn is the number of paging narrowband.

In this case, in the first embodiment, the UE belonging to the same PO is further grouped with a flow (UE _ ID/Ns)/Nn) mod M.

For NB-IoT systems, the paging carrier is the smallest sequence number N that satisfies floor (UE _ ID/(N × Ns)) mod W < W (0) + W (1) + … + W (N).

In this case, in the second specific set of schemes, M ═ floor (floor (UE _ ID/Ns)/W) mod M.

In addition, besides successively transmitting a plurality of indication signals for the same group of POs at different time domain positions, a plurality of sequences can be configured to indicate a subgroup in each PO. Alternatively, to achieve better time diversity gain, multiple indicator signals may be alternately transmitted out over different time units (e.g., sub-frames, or one sequence transmission unit). In both cases, the starting position of a PO corresponding to different indicator signals can be determined by the same parameters or methods, and then the actual time domain resource position of each indicator signal can be determined according to a predefined rule (e.g., every subframe, or every sequence transmitted alternatively). As shown in fig. 12, indication signal 1 and indication signal 2 are transmitted alternately, and the UE may determine the time domain starting position according to the base station configuration, and further determine the time domain transmission position of the indication signal to be monitored. For the configuration information for further grouping the UEs corresponding to one PO, the base station may be configured separately for each paging carrier/narrowband, or may be configured as a cell-specific parameter. Further, the above parameters (including the indication signal related configuration parameters) may be broadcast in System Information (SIB), or configured directly by the MME through UE-specific RRC signaling, or through higher layer (NAS) signaling, etc.

Since for the case of Ns >1 it may be difficult to find the position of the indicator signal before each PO, the PO described above may be replaced by a PF, and then the number N of PFs in each DRX cycle replaces the number N × Ns of POs in the above calculation.

Because the transmission indication information needs to occupy additional downlink resources, in order to reduce the downlink resource occupation, whether more resources are used for paging can be determined according to whether paging is successful, and therefore, the concept similar to the PDCCH search space can be supported. That is, the base station may configure the maximum indication information transmission duration (or repetition number), but the actual transmission time may be less than the maximum transmission duration. The UE may determine the duration of the hypothesis used by the UE to detect the indication information according to the downlink measurement or the length of the last successful detection. As shown in fig. 13, the indication information configured by the base station may occupy N subframes at maximum, but only N' subframes are actually transmitted. From the UE perspective, the detected position can be determined according to the downlink channel state (coverage). Specifically, if the UE has poor downlink coverage and needs a long detection time, the UE may start to detect the indication signal from the detection position 1 (maximum transmission start position). If the UE is in a better coverage condition, the detection time that may be needed is shorter, and the detection may start from detection position 3. It is also possible to start the detection just from the detection position 2, i.e. actually indicate the signal transmission position. If the UE starts to detect from detection position 1, its successful detection probability may be low, and if the base station does not receive the UE random access request, the maximum transmission duration may be selected to transmit the indication information at the next PO to ensure the detection performance. However, compared to the consideration of overhead of the system, the base station only transmits the indication information of N' substations, and it is still possible that the UE with poor coverage can successfully detect the indication signal.

Furthermore, to save time for the UE to wake up, the end position of the actual transmission of the indication information may be fixed, e.g. satisfying a certain time interval with the PO (predefined or configured by the base station through RRC). In this way, if the UE needs a shorter detection time, it can wake up later, thus saving more power. In addition, the design of the end position alignment can also reduce the probability of transmitting the PDCCH or PDSCH in the previous PO. With this design, the UE determines the starting position of the earliest possible transmission of the indication information according to the maximum transmission duration. The UE may determine the location where the UE needs to wake up for detection according to the duration of time actually needed for detection. Specifically, the UE determines the position where the UE starts to detect the indication information according to the duration that needs to be detected and the guard time interval. If the position is before the earliest possible transmission start position, the detection is started from the earliest possible transmission start position. If the location is after the earliest possible transmission location, detection is started from that location. Or, if the position is before the earliest possible transmission start position, the indication information is skipped and the PDCCH is directly detected. Further, the UE may decide the actual detection location according to the available subframe information.

In addition, some possible transmission durations (e.g., repetition times) may be predefined in order to avoid as much mismatch between the actual detection time and the actual transmission time of the UE as possible. Specifically, the base station may configure one of the possible transmission lengths {1,4,8,16,32,64,128} as the maximum possible transmission duration (or repetition number), and then the duration required for actual detection may be determined according to the possible transmission lengths. Specifically, if the possible transmission length configured by the base station is 64, the UE may select the actually required detection duration of 32 or 48 according to the coverage. The modified value may or may not be the value in the possible transmission length.

If the UEs of a PO are further divided into two or more groups, as shown in fig. 11, the UE monitoring the first indication information needs to start from the earliest possible transmission of the second indication information, and further calculates the position (according to the detection duration needed by the UE) where the UE needs to wake up for detection. Further, a guard interval needs to be reserved between the two indication information. For example, the UE needs to rate the end position of the first indication information according to the earliest possible transmission start position of the second indication information and the guard interval that needs to be reserved between the two information, and finally determine the position of the UE where the UE starts to detect the indication information according to the actual detection time (e.g., determined according to RSRP) required by the UE.

The indication information can be used for measuring the channel state, and the UE performs cell synchronization and the like. Specifically, the UE may obtain the RSRP, RSRQ, or RSSI measurement value by measuring CRS signals, and/or NRS signals, and/or the indication information or channel, and/or synchronization signals, and/or downlink broadcast channels (such as PBCH or SIB 1). In addition, in order to measure the channel state through the indication information or the channel, the UE needs to obtain a power difference between the indication information or the channel and other pilot signals. The power difference may be predefined in the protocol or configured by RRC signaling. Specifically, the protocol may specify a default value and further configure other values via RRC. Furthermore, the indication information or channel may be transmitted through one or more antenna ports for joint measurement. For example, the indication information may be defined to use the same antenna port as SSS or PSS, or the signal or channel may use the same transmission format and antenna port as PBCH, or a one-to-one correspondence relationship between the signal or signal and CRS or NRS or DMRS may be defined. For a multi-antenna end system, when the indication information is transmitted between different units (such as different repetitions and different subframes), it may be assumed that different antenna ports are used. Further, the signal or channel may be used for channel estimation, which helps to improve the demodulation performance of the subsequent downlink channel.

Further, to support measurement of the neighbor cell, the base station may configure indication information of the neighbor cell. The UE may obtain configuration information of the indication information of the neighboring cell, such as a time-frequency resource location, a periodic location, a starting location, carrier information, an indication information sequence or an ID of the neighboring cell, through system information or other RRC signaling. The UE may obtain channel states of the neighboring cell(s), such as RSRP, RSRQ, RSSI, and the like, by measuring indication information of the neighboring cell(s).

In the methods described herein, the time domain and the carrier location calculation methods may be the same or different for the connected state and the idle state. Different parameters may be configured by RRC, respectively.

Fig. 13 illustrates an example wireless communication system 100 in which a UE detects indication information in accordance with an embodiment of the present invention. The wireless communication system 100 includes one or more fixed infrastructure elements forming a network distributed over a geographic area. The base unit may also be referred to as an Access Point (AP), an Access Terminal (AT), a base station BS, a Node-B (Node-B), and an evolved NodeB (eNB), a next generation base station (gNB), or other terms used in the art. As shown in fig. 11, one or

more base units

101 and 102 serve several mobile stations MS or UEs or terminal devices or users 103 and 104 in a service area, e.g. within a cell or cell sector. In some systems, one or more BSs are communicatively coupled (core to) to a controller forming an access network, the controller being communicatively coupled to one or more core networks. The disclosed embodiments are not limited to any one particular wireless communication system.

In the time and/or frequency domain, the

base units

101 and 102 transmit Downlink (DL) communication signals 112 and 113 to the UEs 103 and 104, respectively. UEs 103 and 104 communicate with one or

more base units

101 and 102 via Uplink (UL) communication signals 111 and 114, respectively. In one embodiment, the mobile communication system 100 is an Orthogonal Frequency Division Multiplexing (OFDM)/Orthogonal Frequency Division Multiple Access (OFDMA) system including a plurality of base stations including the base station 101 and the base station 102 and a plurality of UEs including the UE 103 and the UE 104. Base station 101 communicates with UE 103 via uplink communication signals 111 and downlink communication signals 112. When the base station has Downlink packets to send to the UEs, each UE obtains a Downlink allocation (resource), such as a set of radio resources in a Physical Downlink Shared Channel (PDSCH) or a narrowband Downlink Shared Channel NPDSCH. When the user equipment needs to send a packet in the Uplink to the base station, the UE obtains a grant from the base station, wherein the grant allocates a Physical downlink Uplink Shared Channel (PUSCH) or a narrowband Uplink Shared Channel NPUSCH containing a set of Uplink radio resources. The UE acquires downlink or uplink scheduling information from a PDCCH, or MPDCCH, or EPDCCH or NPDCCH specific to itself. Downlink or uplink scheduling Information and other Control Information carried by the Downlink Control channel is called Downlink Control Information (DCI). Fig. 11 also shows different physical channels for downlink 112 and uplink 111 examples. The downlink 112 includes a PDCCH or EPDCCH or NPDCCH or MPDCCH 121, a PDSCH or NPDSCH 122, a Physical Control Format Indicator Channel (PCFICH) 123, a Physical Multicast Channel (PMCH) 124, a Physical Broadcast Channel (PBCH) or narrowband Physical Broadcast Channel NPBCH125, a Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH) 126, and a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), or a narrowband Secondary Synchronization Signal NPSS/NSSS 127. The downlink control channel 121 transmits a downlink control signal to the user. The DCI 120 is carried through a downlink control channel 121. The PDSCH122 transmits data information to the UE. PCFICH 123 transmits information for decoding PDCCH, such as a dynamic indication of the number of symbols used by PDCCH 121. PMCH 124 carries broadcast multicast information. The PBCH or NPBCH125 carries a Master Information Block (MIB) for UE early discovery and cell-wide coverage. The PHICH carries hybrid automatic repeat request HARQ information indicating whether the base station correctly received the above transmission signal. The Uplink 111 includes a Physical Uplink Control Channel (PUCCH) 131, a PUSCH132, and a Physical Random Access Channel (PRACH) 133 carrying Random Access information.

In one embodiment, the wireless communication network 100 uses OFDMA or a multi-carrier architecture, including Adaptive Modulation and Coding (AMC) on the downlink and next generation single carrier FDMA architecture or multi-carrier OFDMA architecture for UL transmissions. FDMA-based single-carrier architectures include Interleaved FDMA (IFDMA), Localized FDMA (Localized FDMA), LFDMA, spread discrete fourier transform orthogonal frequency division multiplexing (DFT-spread OFDM) of IFDMA or LFDMA. Also included are various enhanced Non-alternating multiple access NOMA architectures of OFDMA systems, such as PDMA (Pattern division multiple access), SCMA (sparse code multiple access), MUSA (Multi-user shared access), LCRS FDS (Low code division random access), NCMA (Non-orthogonal coded multiple access), RSMA (resource division multiple access), IGMA (Interactive-grid access), LDS-SVE (Low density division with signed vector extension), LSSA (code division multiple access) and signed shared access (RDMA), and WSMA (Wireless access-code division multiple access), and WSMA (Wireless access-signed vector extension), and WSMA (direct code division multiple access).

In an OFDMA system, remote units are served by allocating downlink or uplink radio resources, typically comprising a set of subcarriers over one or more OFDM symbols. Exemplary OFDMA protocols include the LTE and IEEE 802.16 standards, which are evolutions of the 3GPP UMTS standard. The architecture may also include the use of transmission techniques such as multi-carrier CDMA (MC-CDMA), multi-carrier direct sequence CDMA (MC-DS-CDMA), Orthogonal Frequency Code Division Multiplexing (OFCDM) for one or two dimensional transmission. Or may be based on simpler time and/or frequency division multiplexing/multiple access techniques, or a combination of these different techniques. In an alternative embodiment, the communication system may use other cellular communication system protocols including, but not limited to, TDMA or direct sequence CDMA.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method of performing communication in a wireless communication system by a user equipment, UE, the method comprising:

receiving configuration information including time domain information of indication information via higher layer signaling;

identifying a time interval between the indication information and a position where the UE starts monitoring a first Physical Downlink Control Channel (PDCCH) in a Discontinuous Reception (DRX) time based on the time domain information;

monitoring a second PDCCH on a search space of the second PDCCH for receiving the indication information, wherein a time domain location of the search space is determined based on the identified time interval; and

identifying a wake-up indication included in the indication information in the second PDCCH.

2. The method of claim 1, wherein for detection of the indication information, the UE does not need to monitor the PDCCH during a time before the UE starts monitoring the location of the first PDCCH in the DRX time.

3. The method of claim 1, wherein monitoring the second PDCCH comprises monitoring the second PDCCH on an anchor cell in which a synchronization signal is provided for receiving the indication information.

4. The method of claim 1, wherein the indication information is configured for one or more UEs including the UE.

5. A method of performing communication in a wireless communication system by a base station, BS, the method comprising:

transmitting configuration information of time domain information including indication information to a User Equipment (UE) via higher layer signaling, wherein the indication information includes a wake-up indication;

transmitting the indication information to the UE via a second PDCCH on a search space of the second PDCCH, wherein a time domain location of the search space is determined based on the identified time interval.

6. The method of claim 5, wherein for detection of the indication information, the UE does not need to monitor the PDCCH during a time before the UE starts monitoring the location of the first PDCCH in the DRX time.

7. The method of claim 5, wherein the second PDCCH is monitored at the UE for receiving the indication information on an anchor cell in which a synchronization signal is provided.

8. The method of claim 5, wherein the indication information is configured for one or more UEs including the UE.

9. A user equipment, UE, that performs communication in a wireless communication system, the UE comprising:

a transceiver; and

a processor configured to:

receiving, via the transceiver, configuration information including time domain information of indication information via higher layer signaling;

identifying a time interval between the indication information and a position where the UE starts to monitor a first Physical Downlink Control Channel (PDCCH) in a Discontinuous Reception (DRX) time based on the time domain information,

monitoring a second PDCCH on a search space of the second PDCCH for receiving the indication information, wherein a time domain location of the search space is determined based on the identified time interval, an

10. The UE of claim 9, wherein for detection of the indication information, the UE does not need to monitor the PDCCH during a time before the UE starts monitoring the location of the first PDCCH in the DRX time.

11. The UE of claim 9, wherein the processor is further configured to monitor the second PDCCH on an anchor cell in which a synchronization signal is provided for receiving the indication information.

12. The UE of claim 9, wherein the indication information is configured for one or more UEs including the UE.

13. A base station, BS, that performs communication in a wireless communication system, the BS comprising:

a transceiver; and

a processor configured to:

transmitting, via the transceiver, configuration information including time domain information of indication information to a User Equipment (UE) via higher layer signaling, wherein the indication information includes a wake-up indication,

based on the time domain information, identifying a time interval between the indication information and a location where the UE starts monitoring a first Physical Downlink Control Channel (PDCCH) in a Discontinuous Reception (DRX) time, and

transmitting, via the transceiver, the indication information to the UE via a second PDCCH on a search space of the second PDCCH, wherein a time domain location of the search space is determined based on the identified time interval.

14. The BS of claim 13, wherein for detection of the indication information, the UE does not need to monitor the PDCCH during a time before the UE starts monitoring the location of the first PDCCH in the DRX time.

15. The BS of claim 13, wherein the second PDCCH is monitored at the UE for receiving the indication information on an anchor cell in which a synchronization signal is provided.

16. The BS of claim 13, wherein the indication information is configured for one or more UEs including the UE.